fix: harden voice ducking bot detection

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.claude/settings.json

@@ -1,24 +0,0 @@
-{
-  "permissions": {
-    "allow": [
-      "Read",
-      "Edit",
-      "Write",
-      "Glob",
-      "Grep",
-      "Bash(*)",
-      "WebFetch(*)",
-      "WebSearch(*)",
-      "Agent(*)",
-      "mcp__Claude_Preview__*",
-      "mcp__Claude_in_Chrome__*",
-      "mcp__scheduled-tasks__*"
-    ],
-    "deny": [
-      "Bash(git push * main)",
-      "Bash(git push * master)",
-      "Bash(git push --force *)",
-      "Bash(rm -rf /)"
-    ]
-  }
-}

.claude/settings.local.json

@@ -1,26 +0,0 @@
-{
-  "permissions": {
-    "allow": [
-      "Read",
-      "Edit",
-      "Write",
-      "Glob",
-      "Grep",
-      "Bash(*)",
-      "WebFetch(*)",
-      "WebSearch(*)",
-      "Agent(*)",
-      "mcp__Claude_Preview__*",
-      "mcp__Claude_in_Chrome__*",
-      "mcp__scheduled-tasks__*",
-      "Bash(npx vitest:*)",
-      "Bash(cp \"C:\\\\Users\\\\saopig1\\\\.claude\\\\projects\\\\C--Users-saopig1-Music-teamspeak-music-bot\\\\b5a64d6f-051e-4b87-966c-ece97d2b879b\\\\tool-results\\\\webfetch-1776569008470-exv7qe.bin\" /tmp/design.gz)",
-      "Bash(gunzip -f /tmp/design.gz)",
-      "Read(//tmp/**)"
-    ],
-    "deny": [
-      "Bash(git push --force *)",
-      "Bash(rm -rf /)"
-    ]
-  }
-}

.gitignore

@@ -7,5 +7,7 @@ config.json
 cookies/
 .superpowers/
 .worktrees/
+.claude/
+setup.log
 /bin/
 scripts/navbar_bigger.png

README.md

@@ -5,7 +5,7 @@
 <h1 align="center">TSMusicBot</h1>
 
 <p align="center">
-  <strong>TeamSpeak 音乐机器人</strong> — 网易云音乐 + QQ 音乐 + 哔哩哔哩 + YouTube（可选），YesPlayMusic 风格 WebUI 控制面板
+  <strong>TeamSpeak 音乐机器人</strong> — 网易云音乐 + QQ 音乐 + 酷狗音乐 + 哔哩哔哩 + YouTube（可选），Jellyfin / Spotify 可选启用，YesPlayMusic 风格 WebUI 控制面板
 </p>
 
 <p align="center">
@@ -15,26 +15,38 @@
   <img src="https://img.shields.io/badge/许可证-MIT-green" />
   <img src="https://img.shields.io/badge/FFmpeg-已内置-orange?logo=ffmpeg" />
   <img src="https://img.shields.io/badge/Docker-支持-2496ED?logo=docker&logoColor=white" />
+  <img src="https://img.shields.io/badge/酷狗音乐-支持-2ca2f9" />
   <img src="https://img.shields.io/badge/BiliBili-支持-00a1d6?logo=bilibili&logoColor=white" />
+  <img src="https://img.shields.io/badge/Jellyfin-可选-aa5cc3?logo=jellyfin&logoColor=white" />
   <img src="https://img.shields.io/badge/YouTube-可选-FF0000?logo=youtube&logoColor=white" />
+  <img src="https://img.shields.io/badge/Spotify-可选-1DB954?logo=spotify&logoColor=white" />
   <img src="https://img.shields.io/badge/TS3-支持-2580C3?logo=teamspeak&logoColor=white" />
   <img src="https://img.shields.io/badge/TS6-支持-2580C3?logo=teamspeak&logoColor=white" />
 </p>
 
+> v1.10.0 新增**可选**的 [Jellyfin](https://jellyfin.org/) 音源（由 [@ItsEricRao](https://github.com/ItsEricRao) 在 [PR #123](https://github.com/ZHANGTIANYAO1/teamspeak-music-bot/pull/123) 中贡献）：连接自建 Jellyfin 服务器直接播放你自己的音乐库。默认关闭，在 **设置 → Jellyfin 音乐库** 一键开启；原有在线音源保持默认启用，行为不变。
+
 ## 功能特性
 
-- **WebUI 鉴权（必选）** — 用户名 + 密码登录，多用户、两种角色（管理员 / 成员），bcrypt 加密、HttpOnly 会话 Cookie，CSRF 防护，WebSocket 同样鉴权。首次访问引导创建管理员。从无鉴权旧版本升级时请参阅 [更新升级](#更新升级) 章节
-- **多平台音源** — 网易云音乐 + QQ 音乐 + 哔哩哔哩（默认内置），YouTube 可选启用（通过 yt-dlp），统一搜索，结果标注来源
+- **WebUI 鉴权与细粒度权限（必选）** — 用户名 + 密码登录，多用户、两种角色（管理员 / 成员）；成员可进一步配置**细粒度能力**（播放控制 / 队列管理 / 机器人管理 / 平台登录 / 音质）和**按机器人授权白名单**，所有变更操作由后端逐请求强制校验。bcrypt 加密、HttpOnly 会话 Cookie，CSRF 防护，WebSocket 同样鉴权。首次访问引导创建管理员。从无鉴权旧版本升级时请参阅 [更新升级](#更新升级) 章节
+- **游客模式（免登录点歌，默认关闭）** — 管理员可选择允许访客**无需账号密码**进入 WebUI 点歌，并逐项配置游客权限（8 个开关，默认仅「添加到队列末尾」开启）与可控机器人白名单；游客无法查看 / 修改任何设置、管理机器人或访问用户管理。开启后登录页出现 **「以游客身份进入」**。详见下文 **「游客模式 / Guest mode」** 小节
+- **本地收藏歌单** — 在首页 / 搜索 / 歌单页一键收藏，收藏内容按用户存储，登录后跨设备同步
+- **保存/加载播放清单 + 重启后自动恢复队列（可选，默认关闭）** — 管理员在 设置 → 行为设置 开启后，可在网页「已存队列」页或聊天命令（`!save` / `!load` / `!queues`）把当前队列保存为清单，随时**替换**加载或**追加**到队列末尾；同时机器人重启后会自动恢复并继续播放上次的队列。网页保存可选「共享」，聊天保存进入共享清单。**说明**：重启只能从当前曲目的开头恢复（不记忆播放进度）；Spotify 自动恢复为尽力而为（依赖 sidecar 可用）。详见 [使用说明](#使用说明)
+- **本地音频上传播放** — 在搜索页拖拽或选择本地音频上传，上传后可直接播放 / 下一首播放 / 加入队列；管理员可在 设置 → 行为设置 开关此功能，播放结束或停止/清空/替换队列时会清理服务端接收的本地文件
+- **专属链接（单机器人锁定）** — 通过 `/bot/<id>` 专属链接打开 WebUI 时锁定到单个机器人，刷新后保持，适合把某台机器人的控制页分享给特定用户
+- **频道无人时自动暂停** — 机器人所在频道没有其他人时自动暂停播放，有人加入后自动恢复（**默认关闭**，可在设置中开启）
+- **Jellyfin 音源（可选）** — 连接自建 [Jellyfin](https://jellyfin.org/) 服务器作为额外音源：搜索（歌曲 / 专辑 / 歌单）、懒解析直传播放、同步歌词、收藏 Instant Mix 电台（`!fm -j`）、首页「最近添加 / 播放最多 / 收藏 / 流派」，并把播放进度回报给 Jellyfin（PlayCount / 播放状态）。**默认关闭**，在 设置 → Jellyfin 音乐库 一键开启。详见 [可选：Jellyfin 音源](#可选jellyfin-音源)
+- **多平台音源（enabledProviders 门控）** — 网易云音乐 / QQ 音乐 / 酷狗音乐 / 哔哩哔哩 / YouTube（yt-dlp，需安装）**默认启用**，可在 `config.json` 的 `enabledProviders` 中逐个停用；Jellyfin 为可选音源（见上），**Spotify（实验性）** 由独立开关控制（需 Premium + 自建开发者应用，默认关闭，详见 [Spotify 音源（实验性）](#spotify-音源实验性)）。统一搜索（歌曲 / 歌单 / 专辑均支持翻页「加载更多」），结果标注来源，禁用音源不出现在搜索栏
 - **真实客户端协议 (TS3/TS6 双协议)** — 机器人在 TeamSpeak 中可见（非 ServerQuery 隐身模式），自动检测并适配 TS3 和 TS6 服务器，支持 TS6 HTTP Query API
 - **YesPlayMusic 风格 WebUI** — 精美界面，支持深色/浅色主题切换
 - **完整播放控制** — 播放/暂停/上一首/下一首/进度跳转/音量调节
 - **四种播放模式** — 顺序播放/循环播放/随机播放/随机循环
 - **实时歌词同步** — 歌词滚动显示，支持翻译歌词，服务端帧计数精确同步
-- **歌单管理** — 推荐歌单/我的歌单/每日推荐/私人FM，点击播放全部
+- **歌单管理** — 推荐歌单/我的歌单/每日推荐/私人FM，点击播放全部；私人 FM 支持网易云、**QQ 音乐雷达推荐**（`!fm -q`）与**酷狗私人电台**（`!fm -k`）。网易云、QQ、酷狗均提供登录后的推荐歌单 / 每日推荐 / 我的歌单
 - **音质选择** — 标准(128k) / 较高(192k) / 极高(320k) / 无损(FLAC) / Hi-Res / 超清母带
 - **B站视频音频提取** — 搜索B站视频，自动提取DASH最高码率音频流播放
 - **B站热门推荐** — 首页展示B站热门视频和个性化推荐（登录后更准确）
-- **QR码登录** — 扫码登录网易云/QQ音乐/哔哩哔哩账号，Cookie 自动持久化
+- **QR码登录** — 扫码登录网易云/QQ音乐/酷狗音乐/哔哩哔哩账号，Cookie 自动持久化
 - **机器人形象自动更新** — 播放时自动更新头像（专辑封面）、昵称（当前歌曲）、描述、Away 状态、频道描述，停止时恢复默认值。每项功能独立可配置，权限不足时自动降级
 - **多机器人独立播放** — 多个机器人同时在不同服务器或频道播放不同音乐，每个机器人独立的播放队列、进度和音量，WebUI 一键切换控制
 - **播放历史** — 自动记录所有播放过的歌曲
@@ -156,6 +168,16 @@ sudo ./scripts/install.sh
 >
 > **如何判断是否需要迁移**：如果你是全新安装，或者你的机器人数据库中 `identity` 字段已经是空的，则**无需任何操作**。完成上述步骤后，按下面对应的系统升级步骤执行即可。
 
+### 关于 enabledProviders 音源开关（v1.10.0 起）
+
+v1.10.0（[PR #123](https://github.com/ZHANGTIANYAO1/teamspeak-music-bot/pull/123)）引入 `enabledProviders` 音源开关与可选的 Jellyfin 音源。当前默认值为 `["netease", "qq", "bilibili", "youtube", "kugou"]`——**与旧版行为一致**，从更早版本升级**无需任何操作**，在线音源照常可用；Jellyfin 需要手动开启（详见 [可选：Jellyfin 音源](#可选jellyfin-音源)）。
+
+> ⚠️ **仅影响短暂运行过 v1.10.0 初版的用户**：该版本曾把默认音源设为 Jellyfin-only。如果你在那段时间保存过设置，`data/config.json` 中可能被写入了 `"enabledProviders": ["jellyfin"]`，升级后在线音源会保持停用。修复方法：把在线音源加回列表（或直接删除该字段以使用默认值），重启机器人（网易云 / QQ 的内嵌 API 服务需要重启才会启动）：
+>
+> ```json
+> "enabledProviders": ["netease", "qq", "bilibili", "youtube", "kugou", "jellyfin"]
+> ```
+
 ### 从 WebUI 无鉴权版本升级（重要）
 
 本次更新引入了**强制 WebUI 鉴权**。从无鉴权旧版本升级后，**WebUI 必须先创建管理员账号才能使用**。所有 `/api/*` 端点（除少量公共白名单）和 `/ws` 现在都需要登录。
@@ -179,6 +201,28 @@ sudo ./scripts/install.sh
 - 在 **设置 → 用户管理**（仅管理员）中添加 / 删除 / 重置密码 / 切换角色。
 - 至少保留一个管理员：系统会阻止删除或降级最后一位管理员。
 
+**游客模式 / Guest mode**：
+
+让访客**无需账号密码**即可进入 WebUI 点歌，同时严格限制其可用能力。该功能**默认关闭**，只有管理员能开启。
+
+- **开启方式**：管理员在 **设置 → 游客模式** 打开「允许游客访问」（仅管理员可见此区块）。开启后登录页会出现 **「以游客身份进入」** 按钮，访客点击即可创建游客会话，无需任何凭据。游客共享同一匿名身份、会话有效期较短（约 1 天）。关闭游客模式（或缩小机器人作用域）后立即生效，所有在线游客会话——包括正在连接的实时 WebSocket——会被立刻断开 / 重新限制。
+- **逐项权限（8 个开关，管理员配置）**：除「添加到队列末尾」外**全部默认关闭**，按需逐项放开。
+
+  | 开关 | 字段 | 默认 |
+  |------|------|------|
+  | 添加到队列末尾 | `addToQueue` | **开** |
+  | 添加到下一首 | `playNext` | 关 |
+  | 立即播放（不清空队列） | `playNow` | 关 |
+  | 跳过当前歌曲 | `skip` | 关 |
+  | 暂停/继续/进度/音量 | `transport` | 关 |
+  | 移除/清空队列 | `removeClear` | 关 |
+  | 切换播放模式 / FM | `playMode` | 关 |
+  | 播放整个歌单/专辑 | `playCollection` | 关 |
+
+- **按机器人授权（游客作用域）**：可选择「全部机器人」或指定一份机器人白名单。作用域之外的机器人对游客**不可见、不可控**。
+- **游客始终被禁止**：查看或修改任何设置、管理机器人、设置音乐平台账号 / 凭据、修改音质、收藏歌单、修改密码、访问用户管理与操作审计，以及读取机器人主人的私人歌单 / 私人 FM / 每日推荐等平台账号数据。这些限制不受上面 8 个开关影响，**永远锁死**。
+- **复现 issue #83 的「下一首 only」需求**：在 **设置 → 游客模式** 中关闭「添加到队列末尾」并打开「添加到下一首」，游客便只能把歌曲加到下一首播放。
+
 **如何重置忘记的管理员密码**：
 
 如果你忘记了管理员密码，可以直接编辑 SQLite 数据库 `data/tsmusicbot.db`：
@@ -197,7 +241,7 @@ sqlite3 data/tsmusicbot.db "UPDATE users SET passwordHash='<paste-hash-here>' WH
 
 **反向代理用户特别注意**：如果通过 nginx / Caddy / Cloudflare 暴露 WebUI，**必须**在 `config.json` 中设置 `"trustProxy": true`，否则 Cookie 不会带 `Secure` 标志，且登录限流会把所有用户合并到同一个桶。详见下方 [反向代理部署注意事项](#反向代理部署注意事项)。
 
-**旧版 `config.adminPassword` / `adminGroups`**：这两个配置项在旧版本中预留但从未实际启用（TS-side admin 命令权限的占位字段）。保留以避免破坏旧 `config.json`，但不再影响任何行为。可以放心忽略。
+**`config.adminGroups`（现已启用）**：用于限制管理类聊天命令（`stop`/`clear`/`remove`/`move`/`vol`/`mode`）只能由指定 TeamSpeak 服务器组的成员运行；为空时不做任何限制（向后兼容）。详见 [TeamSpeak 命令权限](#teamspeak-命令权限管理类命令限制)。`config.adminPassword` 则是旧版预留字段，当前版本未使用，保留以兼容旧 `config.json`，可以放心忽略。
 
 ### Windows 用户
 
@@ -273,19 +317,21 @@ sudo systemctl start tsmusicbot
    - 端口（默认 9987，自托管或非标准端口请填写实际值）
    - 机器人昵称
    - 可选：服务器密码、默认频道
-3. 在 **设置 → 音乐账号** 扫码登录网易云 / QQ 音乐 / B 站账号（可选，登录后可播放 VIP 歌曲）
-4. 在 **设置 → 用户管理**（仅管理员可见）按需添加成员，成员账号可以控制播放但无法管理其他用户
+3. 在 **设置 → 音乐账号** 扫码登录网易云 / QQ 音乐 / 酷狗音乐 / B 站账号（可选，登录后可播放 VIP 歌曲、获取每日推荐 / 我的歌单等）
+4. （可选）在 **设置 → Jellyfin 音乐库** 连接自建 Jellyfin 服务器并打开「启用 Jellyfin 音源」（安装向导第 3 步保存连接时会自动启用；详见 [可选：Jellyfin 音源](#可选jellyfin-音源)）
+5. 在 **设置 → 用户管理**（仅管理员可见）按需添加成员。成员默认可控制播放但无法管理其他用户；管理员还可为每个成员单独配置**能力**（播放控制 / 队列 / 机器人管理 / 平台登录 / 音质）和**可操作的机器人白名单**，未授权的机器人对该成员不可见、不可控
 
 ### WebUI 页面说明
 
 | 页面 | 功能 |
 |------|------|
-| **首页** | 推荐歌单、每日推荐、私人FM、我的歌单 |
-| **搜索** | 三平台统一搜索，结果标注网易云/QQ/B站来源 |
-| **歌单** | 查看歌单详情，播放全部（根据当前播放模式选择首歌） |
+| **首页** | 推荐歌单、每日推荐、私人FM（网易云 / QQ 雷达 / 酷狗电台）、我的歌单、收藏的歌单（各源带标签切换）；启用 Jellyfin 后另有「Jellyfin 电台 / 最近添加 / 播放最多 / 收藏 / 流派」区块 |
+| **搜索** | 跨音源统一搜索（仅显示已启用的音源；启用 Jellyfin 后其结果排最前），结果标注来源，可一键收藏歌单 |
+| **歌单** | 查看歌单详情，播放全部（根据当前播放模式选择首歌），一键收藏 |
 | **歌词** | 全屏歌词页，实时同步滚动，模糊专辑封面背景 |
 | **历史** | 播放历史记录 |
-| **设置** | 账户（修改自己密码） / 主题切换 / 机器人管理 / 三平台账号登录 / 音质选择 / 命令前缀 / 用户管理（仅管理员）/ 操作审计（仅管理员） |
+| **已存队列** | 保存当前队列为清单、加载（替换）/ 追加 / 删除已保存清单（仅在管理员开启「保存/加载播放清单」后出现） |
+| **设置** | 账户（修改自己密码） / 主题切换 / 机器人管理 / 行为设置（空闲超时、频道无人自动暂停、保存/加载播放清单、单曲直接播放不清空队列） / 多平台账号登录（网易云 / QQ / 酷狗 / B站） / 音质选择 / 命令前缀 / 用户管理（仅管理员，含成员能力与机器人白名单）/ 操作审计（仅管理员） |
 
 ### TeamSpeak 文字命令
 
@@ -293,11 +339,17 @@ sudo systemctl start tsmusicbot
 
 | 命令 | 说明 |
 |------|------|
-| `!play <歌名>` | 搜索并播放 |
+| `!play <歌名>` | 搜索并播放（取最热门的匹配项；默认音源为网易云） |
+| `!play -n <歌名>` | 显式从网易云音乐搜索（默认音源即网易云，通常可省略） |
+| `!play -j <歌名>` | 从 Jellyfin 搜索（需先启用 Jellyfin 音源） |
 | `!play -q <歌名>` | 从 QQ 音乐搜索 |
+| `!play -k <歌名>` | 从酷狗音乐搜索 |
 | `!play -b <关键词>` | 从哔哩哔哩搜索视频并播放音频 |
 | `!play -y <关键词>` | 从 YouTube 搜索并播放（需要安装 [yt-dlp](#可选youtube-音源)）|
-| `!add <歌名>` | 添加到播放队列 |
+| `!search <歌名> [-j\|-n\|-q\|-k\|-b\|-y]` | 列出前若干个匹配结果（含序号与 id），用于挑选同名歌曲；可加平台标志切换音源 |
+| `!play #<序号>` | 播放上一次 `!search` 结果中的第 N 项（区分同名歌曲） |
+| `!play id:<id>` | 按歌曲 id 播放精确的某首歌（也支持直接粘贴网易云 / QQ / B站 歌曲链接；Jellyfin 曲目用 GUID ItemId） |
+| `!add <歌名>` | 添加到播放队列（同样支持 `#序号` / `id:<id>` / 链接） |
 | `!pause` / `!resume` | 暂停 / 恢复播放 |
 | `!next` / `!prev` | 下一首 / 上一首 |
 | `!stop` | 停止播放并清空队列 |
@@ -305,21 +357,52 @@ sudo systemctl start tsmusicbot
 | `!queue` | 查看播放队列 |
 | `!remove <位置>` | 从队列中删除指定位置的歌曲（位置从 1 开始，见 `!queue`） |
 | `!mode <seq\|loop\|random\|rloop>` | 切换播放模式 |
-| `!playlist <歌单名或ID>` | 加载歌单（支持名称模糊搜索和 ID） |
+| `!playlist <歌单名或ID>` | 加载歌单（支持名称模糊搜索和 ID；Jellyfin 歌单 GUID 也可直接粘贴） |
 | `!playlist -q <歌单名>` | 从 QQ 音乐搜索并加载歌单 |
-| `!album <ID>` | 加载专辑 |
-| `!artist <歌手名>` | 按歌手循环播放（支持 `-q`/`-b`/`-y`） |
-| `!fm` | 私人 FM（网易云，自动续播） |
-| `!lyrics` | 显示当前歌词 |
+| `!album <专辑名或ID>` | 加载专辑（支持名称搜索 / 数字 ID / Jellyfin GUID） |
+| `!artist <歌手名>` | 按歌手循环播放（支持 `-j`/`-n`/`-q`/`-k`/`-b`/`-y`） |
+| `!fm` | 私人 FM（默认网易云，自动续播） |
+| `!fm -j` | Jellyfin 电台：从收藏出发的 Instant Mix（需启用 Jellyfin，自动续播） |
+| `!fm -q` | QQ 音乐雷达 / 猜你喜欢 FM（自动续播） |
+| `!fm -k` | 酷狗私人电台 / 个性化推荐 FM（自动续播） |
+| `!lyrics` | 显示当前完整歌词（自动分多条消息发送，不再只显示开头几行） |
 | `!now` | 当前播放信息 |
 | `!vote` | 投票跳过当前歌曲 |
 | `!move <频道名>` | 移动到指定频道 |
+| `!save <名称>` | 保存当前队列为一份已保存清单（需启用「保存/加载播放清单」，聊天保存进入共享清单） |
+| `!load [-a] <名称>` | 加载已保存清单（默认替换当前队列并播放；加 `-a` 追加到队列末尾） |
+| `!queues` | 列出已保存（共享）清单 |
 | `!help` | 显示帮助信息 |
 
 > 命令前缀默认为 `!`，可在设置页面修改。支持别名：`!p` = `!play`，`!s` = `!skip`，`!n` = `!next`
+>
+> `!save` / `!load` / `!queues` 仅在管理员开启「保存/加载播放清单」后可用（默认关闭），未启用时回复「此功能未启用」。
+
+### TeamSpeak 命令权限（管理类命令限制）
+
+默认情况下，频道里任何人都能运行所有聊天命令。你可以把一组「管理类」命令限制为只有特定 TeamSpeak 服务器组的成员才能运行：
+
+- 受限命令：`stop`、`clear`、`remove`、`move`、`vol`、`mode`
+- 其余命令（点歌、队列、跳过、歌词等）始终对所有人开放
+- **默认不限制**：管理服务器组列表为空时，所有命令对所有人开放（向后兼容）
+
+**配置方式**
+
+- 网页端：设置 → 命令权限，填写允许的服务器组 ID（逗号分隔），保存即时生效。
+- 或编辑 `config.json` 的 `adminGroups`（数字数组），例如 `"adminGroups": [6, 8]`。
+
+填入任意服务器组 ID 后，限制立即开启：只有属于这些组之一的用户才能运行受限命令，其他人会收到「⛔ 需要管理员权限（该命令仅限管理员服务器组）」的提示。
+
+> 提示（fail-closed）：当受限命令来自一个机器人当前看不到其服务器组的发送者（例如不在机器人所在频道的私聊），机器人会尝试查询其分组；若仍无法确定，则拒绝执行。
+
+**如何查看服务器组 ID**
+
+在 TeamSpeak 客户端中打开「权限 → 服务器组」（Permissions → Server Groups）对话框，选中某个组后，其 ID 会显示在标题栏/状态栏；或在服务器组管理界面中查看每个组对应的数字 ID。把需要授权的组 ID 填入上面的设置即可。
 
 ### 音质等级
 
+**在线音源（网易云等）**
+
 | 等级 | 码率 | 格式 | 说明 |
 |------|------|------|------|
 | 标准 | 128kbps | MP3 | 免费可用 |
@@ -329,8 +412,29 @@ sudo systemctl start tsmusicbot
 | Hi-Res | ~1500kbps | FLAC | 需要 VIP |
 | 超清母带 | ~4000kbps | FLAC | 需要黑胶 VIP |
 
+**Jellyfin（启用后）**
+
+| 等级 | 说明 |
+|------|------|
+| **原始直传（direct）** | **默认**：原始文件不转码直传（机器人本地统一转 Opus，此档即最高音质） |
+| 320kbps / 192kbps / 128kbps | 由 Jellyfin 服务器转码后传输，适合公网带宽有限的自建服务器 |
+
 在设置页面选择音质，立即生效（影响后续播放的歌曲）。
 
+> **重启后保留（#125）**：音质选择会持久化到 `data/config.json`（每个平台各自记录），重启机器人后自动恢复，无需每次手动重设。
+
+### 重启后保留的播放设置
+
+以下运行时设置在改动时自动落盘，重启机器人后自动恢复，不再回到默认值：
+
+| 设置 | 作用范围 | 存储位置 |
+|------|----------|----------|
+| **播放音量**（`!vol` / WebUI 音量条 / REST `/volume`） | 每个机器人独立 | 数据库 `bot_instances.volume` |
+| **播放模式**（`!mode` / WebUI / REST `/mode`：顺序 / 列表循环 / 随机 / 随机循环） | 每个机器人独立 | 数据库 `bot_instances.play_mode` |
+| **音质**（各平台，WebUI 设置页 / REST `/quality`） | 全局（各平台各自记录） | `data/config.json` 的 `audioQuality` |
+
+聊天命令、WebUI、REST API 三种入口的改动都会被持久化。播放队列、当前歌曲、进度、`!fm` / `!artist` 等临时播放状态仍为一次性状态，重启后不保留（`!fm` / `!artist` 内部临时切换的随机 / 循环也**不会**覆盖你用 `!mode` 显式保存的偏好）。
+
 ## 项目架构
 
 ```
@@ -344,15 +448,19 @@ teamspeak-music-bot/
 │   │   ├── commands.ts         # 文字命令解析器（前缀、别名、权限）
 │   │   ├── instance.ts         # Bot 实例（绑定 TS3 + 播放器 + 音源）
 │   │   ├── manager.ts          # 多实例生命周期管理
+│   │   ├── auto-pause.ts       # 频道无人自动暂停/恢复的决策逻辑
 │   │   └── profile.ts          # 机器人形象管理（头像/昵称/描述/Away/频道描述）
 │   ├── data/                   # 数据层
-│   │   ├── config.ts           # JSON 配置文件
-│   │   └── database.ts         # SQLite 数据库（播放历史、实例持久化）
+│   │   ├── config.ts           # JSON 配置文件（持久化到 data/config.json）
+│   │   ├── permissions.ts      # 细粒度能力 + 按机器人授权白名单
+│   │   └── database.ts         # SQLite 数据库（播放历史、实例、收藏、权限持久化）
 │   ├── music/                  # 音源服务
 │   │   ├── provider.ts         # 统一 MusicProvider 接口
+│   │   ├── jellyfin.ts         # Jellyfin 适配器（可选音源，直连 REST API）
 │   │   ├── netease.ts          # 网易云音乐适配器
 │   │   ├── qq.ts               # QQ 音乐适配器
 │   │   ├── bilibili.ts         # 哔哩哔哩适配器（视频音频提取）
+│   │   ├── kugou.ts            # 酷狗音乐适配器（直连 API，无 npm 依赖 / 无内嵌服务）
 │   │   ├── youtube.ts          # YouTube 适配器（可选，依赖 yt-dlp）
 │   │   ├── auth.ts             # Cookie 持久化存储
 │   │   └── api-server.ts       # 嵌入式 API 服务（自动启动）
@@ -364,10 +472,13 @@ teamspeak-music-bot/
 │   ├── web/                    # Web 后端
 │   │   ├── server.ts           # Express + WebSocket 服务
 │   │   ├── websocket.ts        # 实时状态广播
+│   │   ├── middleware/         # requireAuth / requireAdmin / requirePermission / CSRF
 │   │   └── api/                # REST API 路由
 │   │       ├── bot.ts          # 机器人管理 CRUD
 │   │       ├── music.ts        # 搜索/歌单/歌词/音质
-│   │       ├── player.ts       # 播放控制/队列/历史/跳转
+│   │       ├── player.ts       # 播放控制/队列/历史/跳转/FM
+│   │       ├── favorites.ts    # 本地收藏歌单 CRUD
+│   │       ├── users.ts        # 用户管理 + 成员权限
 │   │       └── auth.ts         # QR登录/Cookie/SMS
 │   └── index.ts                # 入口（启动所有服务）
 ├── web/src/                    # 前端源码 (Vue 3)
@@ -383,11 +494,11 @@ teamspeak-music-bot/
 │   └── docker/                 # Docker 部署文件
 │       ├── Dockerfile
 │       └── docker-compose.yml
-├── data/                       # 运行时数据（自动创建，不上传）
-│   ├── tsmusicbot.db           # SQLite 数据库
-│   ├── cookies/                # 登录 Cookie
-│   └── logs/                   # 日志文件
-└── config.json                 # 配置文件（首次运行自动生成，不上传）
+└── data/                       # 运行时数据（自动创建，不上传）
+    ├── config.json             # 配置文件（首次运行自动生成，可手动编辑）
+    ├── tsmusicbot.db           # SQLite 数据库
+    ├── cookies/                # 登录 Cookie
+    └── logs/                   # 日志文件
 ```
 
 ## 技术栈
@@ -399,14 +510,74 @@ teamspeak-music-bot/
 | **数据库** | better-sqlite3 (SQLite) |
 | **音频处理** | FFmpeg (ffmpeg-static 内置), @discordjs/opus |
 | **TS 协议** | @honeybbq/teamspeak-client（完整客户端协议）+ 自研 TS6 协议适配层 |
+| **Jellyfin** | Jellyfin REST API（可选音源，直连，无额外 npm 依赖） |
 | **网易云 API** | NeteaseCloudMusicApi |
-| **QQ 音乐 API** | @sansenjian/qq-music-api |
+| **QQ 音乐 API** | @sansenjian/qq-music-api（锁定 `~2.4.0`，需 Node ≥ 20.17） |
 | **哔哩哔哩** | BiliBili Web API（搜索、DASH 音频流、QR 登录） |
+| **酷狗音乐** | 酷狗公开 API（直连，无 npm 依赖 / 无内嵌服务；请求签名 / KRC 歌词解码 / 设备注册移植自 MIT 的 MakcRe/KuGouMusicApi，改用 Node 内置 crypto + zlib） |
 | **前端框架** | Vue 3, Vite 5, Pinia, Vue Router 4 |
 | **界面样式** | SCSS（YesPlayMusic 设计风格） |
 | **图标** | @iconify/vue |
 | **日志** | pino |
 
+## 可选：Jellyfin 音源
+
+本项目可将自建 [Jellyfin](https://jellyfin.org/) 媒体服务器作为**额外音源**：机器人直接播放你自己音乐库里的文件，不依赖任何在线平台的可用性 / 版权 / 登录状态。该音源**默认关闭**，需要手动启用。
+
+### 启用与连接配置
+
+三种方式任选：
+
+1. **首次安装向导** — 第 3 步即 Jellyfin 连接卡（可跳过，稍后配置）；填写并「保存并继续」会**自动启用**该音源。
+2. **WebUI** — 设置 → Jellyfin 音乐库（可选）：打开「**启用 Jellyfin 音源**」开关，填写服务器地址、选择认证方式、「测试连接」验证后保存，**保存即时生效，无需重启**。
+3. **config.json** — 手动编辑 `jellyfin` 配置块，并把 `"jellyfin"` 加入 `enabledProviders`，然后重启。
+
+两种认证方式：
+
+| 模式 | 填写内容 | 说明 |
+|------|---------|------|
+| **账号密码**（默认） | `username` + `password` | 以该用户身份登录（`AuthenticateByName`），token 自动持久化、失效自动重登 |
+| **API Key** | `apiKey` + `userId` | 使用管理后台生成的 API Key；`userId` 决定使用谁的音乐库 / 收藏 / 歌单 |
+
+```jsonc
+// config.json 片段
+{
+  "jellyfin": {
+    "serverUrl": "https://jellyfin.example.com",
+    "authMode": "userpass",     // 或 "apikey"
+    "username": "music",
+    "password": "······",
+    "apiKey": "",               // apikey 模式填写
+    "userId": ""                // apikey 模式填写
+  },
+  "enabledProviders": ["netease", "qq", "bilibili", "youtube", "kugou", "jellyfin"]
+}
+```
+
+> 密码 / API Key 在 WebUI 中**只写不回显**；表单留空表示保持已保存的值不变。
+
+### 功能
+
+- **搜索** — 歌曲 / 专辑 / 歌单，支持翻页「加载更多」；WebUI 统一搜索中 Jellyfin 结果排最前
+- **播放** — 懒解析播放地址；默认**原始直传**（不经 Jellyfin 转码），也可选 320/192/128kbps 服务器转码档（设置 → 音质设置）
+- **歌词** — 读取 Jellyfin 的歌词接口（内嵌或 .lrc），时间轴同步滚动，`!lyrics` 可用
+- **电台 / FM**（`!fm -j` 或首页「Jellyfin 电台」卡片）— 随机取一首**收藏**做种子生成 Instant Mix 歌曲流；没有收藏则回退到最近播放、再回退随机曲目
+- **首页区块** — 最近添加（专辑）/ 播放最多 / Jellyfin 收藏 / 我的歌单 / 流派（点流派芯片即播放该流派）
+- **播放上报** — 播放开始 / 进度（约 10s 一次）/ 停止会回报给 Jellyfin（`Sessions/Playing` 系列接口），你的 Jellyfin 播放统计（PlayCount、最近播放）保持准确；上报失败不影响播放
+- **聊天命令** — 启用后用 `-j` 标志：`!play -j <歌名>`、`!fm -j`、`!artist -j <歌手>`；`!playlist` / `!album` / `!play id:` 可直接粘贴 Jellyfin GUID。若把在线音源全部停用、只保留 Jellyfin，不带标志的命令会自动以 Jellyfin 为默认音源
+
+### enabledProviders：音源开关
+
+`config.json` 的 `enabledProviders` 数组决定哪些音源可用（默认 `["netease", "qq", "bilibili", "youtube", "kugou"]`，即在线音源全开、Jellyfin 关闭）：
+
+- 可选值：`jellyfin`、`netease`、`qq`、`bilibili`、`youtube`、`kugou`（`local` 由 `localAudioEnabled` 控制，`spotify` 由 `spotify.enabled` 控制）
+- 未列出的音源：聊天命令返回「音源未启用」、REST 返回 400、WebUI 搜索栏 / 登录卡 / FM 卡片自动隐藏
+- 不带平台标志的命令默认走**固定优先级中第一个已启用的音源**：网易云 → QQ → 酷狗 → Jellyfin → B站 → YouTube（默认配置下即网易云）
+- **自定义默认音源（`defaultPlatform`）** — 想让不带标志的 `!play 歌名` 直接用某个音源（例如常听哔哩哔哩，免去每次加 `-b`），可在 设置 → 默认音源 里选择，或在 `config.json` 中设置 `"defaultPlatform": "bilibili"`。取值须是 `enabledProviders` 里已启用的音源，否则被忽略（回退到上面的固定优先级）；留空 / `null` / 删除该字段即恢复固定优先级。WebUI 保存后即时生效，无需重启
+- 网易云 / QQ 停用时，其内嵌 API 服务（端口 3001 / 3200）**不会启动**
+- 示例（Jellyfin 为主、只留网易云备用）：`"enabledProviders": ["jellyfin", "netease"]`（默认音源仍为网易云，点歌用 `-j`、停用网易云，或直接把 `defaultPlatform` 设为 `"jellyfin"`）；示例（纯 Jellyfin）：`"enabledProviders": ["jellyfin"]`
+- 注意：重新启用网易云 / QQ 的内嵌 API 服务需要重启机器人；其余音源改动即时生效（WebUI 的 Jellyfin 开关即改此列表）
+
 ## 可选：YouTube 音源
 
 YouTube 是**可选**的音源，默认**未启用**，需要安装 [yt-dlp](https://github.com/yt-dlp/yt-dlp) 才能使用。启用后可通过聊天命令 `!play -y <关键词>` 或 WebUI 的 YouTube 平台选项搜索/播放 YouTube 视频的音频流。
@@ -456,9 +627,134 @@ pip install -U yt-dlp
 - 受 YouTube 风控/地域限制，部分视频可能无法播放
 - `yt-dlp` 更新较频繁，如果播放失败，先尝试升级 `yt-dlp` 到最新版本
 
+## Spotify 音源（实验性）
+
+> **⚠️ 实验性功能，启用前请务必读完本节**
+>
+> - **需要 Spotify Premium 账号。** 免费账号无法通过 Spotify Connect 输出音频，无法使用本功能。
+> - **使用你自己在 Spotify Developer Dashboard 注册的应用（Client ID）。** 本项目**不内置任何共享凭据**，也不会替你代管账号。
+> - Spotify 官方并未开放第三方播放的公开授权，本功能处于 **Spotify 服务条款的灰色地带**，是否使用请自行评估，**风险自负**。
+> - 该音源**默认关闭**（`spotify.enabled = false`），需要手动开启并完成授权。
+> - 这**不是** YouTube 那样的「免登录回退音源」，而是**真正的 Spotify 音频**，必须有 Premium 才能出声；音频链路依赖第三方开源解码器（librespot / go-librespot），本项目仅在本地作为独立子进程调用，**播放效果不做保证**，也未在本仓库端到端测试。
+
+### 工作原理（简述）
+
+1. `librespot`（Rust）或 `go-librespot`（Linux）作为**独立子进程**登录 Spotify Connect 并解码音频，输出原始 **PCM**。
+2. 本项目用内置 **ffmpeg** 把 PCM 重采样到 **48kHz**。
+3. 重采样后的音频接入**现有的 Opus 编码 / 发送管线**（与其它音源共用），推送到 TeamSpeak。
+4. 歌名、歌手、封面等**元数据来自 Spotify Web API**。
+
+### 平台矩阵
+
+后端由配置项 `spotify.backend` 决定，可选 `auto`（默认）/ `go-librespot` / `librespot`：
+
+| 平台 | 默认后端（`auto`） | 说明 |
+|------|------|------|
+| Windows | `librespot`（Rust） | 不支持 go-librespot（FIFO 仅限 POSIX，且官方无 Windows 资产） |
+| Linux / Docker | `go-librespot`（可回退 `librespot`） | `auto` 优先 go-librespot，未检测到时自动改用 librespot |
+| macOS | `librespot`（Rust） | 与 Windows 同，仅支持 Rust 版 |
+
+> `auto` 会按平台与二进制可用性自动选择：优先 `go-librespot`（若可用），否则 `librespot`。若显式指定 `go-librespot` 或 `librespot` 但对应二进制不存在，则该音源保持不可用。
+
+### 获取二进制
+
+程序会先在项目根目录的 `bin/` 中查找，找不到再回退到系统 `PATH`。`bin/` 已被 `.gitignore` 忽略，不影响代码更新。
+
+**Rust librespot（librespot-org，全平台）** — 官方**没有预编译发布包**，需自行获取（任选其一）：
+
+```bash
+# 方式 1：用 Cargo 编译安装（需要 Rust 工具链）
+cargo install librespot
+
+# 方式 2（Windows）：scoop / choco
+scoop install librespot        # 或：choco install librespot
+
+# 方式 3：把可执行文件放到项目 bin/ 目录
+#   Windows:      bin/librespot.exe
+#   Linux/macOS:  bin/librespot
+```
+
+或直接把 `librespot` 加入系统 `PATH`。
+
+**go-librespot（仅 Linux）** — 官方仅提供 **Linux** 预编译资产：
+
+```bash
+# 从 Release 页下载对应架构的二进制：
+#   https://github.com/devgianlu/go-librespot/releases
+# 放到项目 bin/ 目录（或加入系统 PATH）：
+#   bin/go-librespot
+```
+
+> **Windows 不支持 go-librespot**：它依赖 POSIX FIFO（`mkfifo`），官方也只发布 Linux 资产。Windows / macOS 请使用 Rust `librespot`。
+
+### 注册 Spotify 开发者应用 + 回调地址
+
+1. 打开 [Spotify Developer Dashboard](https://developer.spotify.com/dashboard)，新建一个应用，记下 **Client ID**。
+2. 在应用设置里添加 **Redirect URI（回调地址）**，精确填写：
+
+   ```
+   http://127.0.0.1:<webPort>/api/spotify/callback
+   ```
+
+   其中 `<webPort>` 与本项目设置里的 Web 端口一致（默认 `3000`，即 `http://127.0.0.1:3000/api/spotify/callback`）。回调路径必须精确为 `/api/spotify/callback`。
+3. 本项目使用 **Authorization Code + PKCE** 流程，**不需要 Client Secret**（配置里的 `clientSecret` 可留空）。
+4. 授权时请求的权限范围（scope）：
+
+   ```
+   streaming user-read-playback-state user-modify-playback-state user-read-currently-playing playlist-read-private
+   ```
+
+### 启用步骤
+
+1. 进入**设置页**的「连接 Spotify」卡片。
+2. 填入 **Client ID**、选择**后端**（`auto` / `go-librespot` / `librespot`）、打开**开关**。
+3. 点击**保存**。
+4. 点击「**连接 Spotify**」，在弹出的 Spotify 页面完成 **OAuth 授权**。
+
+> 仅当 **`enabled = true`** + **已完成 OAuth 授权** + **检测到可用的后端二进制** 三者同时满足时，Spotify 音源才可播放。任一条件不满足，该音源保持**不可用**（点播会被跳过，播放队列照常前进，不影响其它音源）。
+
+对应的配置块（`data/config.json`）：
+
+```json
+{
+  "spotify": {
+    "enabled": false,
+    "backend": "auto",
+    "clientId": "",
+    "clientSecret": "",
+    "deviceName": "TSMusicBot",
+    "bitrate": 320
+  }
+}
+```
+
+OAuth 相关端点：`/api/spotify/login`、`/api/spotify/callback`、`/api/spotify/status`。
+
+### 许可与来源
+
+- **go-librespot** 采用 **GPL-3.0** 许可。本项目**仅将其作为独立子进程调用**（mere aggregation / 独立聚合），**不链接、不打包**其代码，因此**不影响本项目自身的 MIT 许可**。
+  - 源码与许可：<https://github.com/devgianlu/go-librespot>（GPL-3.0；如需其对应源码请前往该仓库获取 —— source offer）。
+- **Rust librespot** 采用 **MIT** 许可：<https://github.com/librespot-org/librespot>。
+
+### 故障排查
+
+| 现象 | 处理 |
+|------|------|
+| 提示「未检测到 librespot / go-librespot」 | 检查项目 `bin/` 目录里是否放了可执行文件，或该命令是否在系统 `PATH` 中；Rust 版可用 `cargo install librespot` 安装 |
+| 提示「未授权 / 需要连接 Spotify」 | 在设置页「连接 Spotify」卡片点击「连接 Spotify」完成 OAuth 授权 |
+| Windows 上无法使用 go-librespot | 属预期行为（FIFO 仅限 POSIX，官方无 Windows 资产）；请把 `backend` 设为 `librespot` 或 `auto` |
+| 完全没有声音 | 确认账号为 **Spotify Premium**；免费账号无法通过 Spotify Connect 输出音频 |
+
+### 已知限制
+
+- 在多租户/共享主机上，librespot 通过命令行参数接收访问令牌，同机其他本地进程理论上可读取（令牌约 1 小时有效，需本地访问权限）。
+- Spotify 连续播放（gapless spotify→spotify）时，网页进度条的"已播放时间"可能不准确（以后端上报的播放进度为准）。
+- 运行多个启用 Spotify 的 bot 时，若两个 bot 的 id 端口哈希发生冲突（同一 % 1000 桶），第二个 go-librespot 边车会因端口占用而启动失败、该 bot 的 Spotify 不可用（后续将改为按需分配空闲端口）。
+- **一个 Spotify Premium 账号只支持「一路」正在播放的音频流**。因此若要同时运行**多个**启用 Spotify 的 bot 并让它们各自独立播放，必须为**每个 bot 配置独立的 Spotify 账号**。在 Rust（librespot）后端上，本机制已把播放控制（暂停/继续/跳转）限定到 bot 自己的设备，并在读取播放状态时忽略其它设备的状态，以避免多 bot 之间互相抢占、来回抖动（cross-control/thrash）；但受 Spotify 平台限制，**共用同一账号无法实现多路同时播放**（第二个 bot 开始播放会夺走该账号唯一的活跃会话）。go-librespot 后端为每个边车独立的本地 REST API，不受此账号级抢占影响。
+
 ## 配置文件
 
-`config.json` 在首次运行时自动生成，可手动编辑：
+配置文件位于 **`data/config.json`**（与数据库、Cookie、日志同在持久化的 `data/` 目录，Docker 部署对应挂载卷），首次运行时自动生成，可手动编辑：
 
 ```json
 {
@@ -472,11 +768,16 @@ pip install -U yt-dlp
   "adminPassword": "",
   "adminGroups": [],
   "autoReturnDelay": 300,
-  "autoPauseOnEmpty": true
+  "autoPauseOnEmpty": false,
+  "idleTimeoutMinutes": 0,
+  "publicUrl": "",
+  "trustProxy": false
 }
 ```
 
-> **关于 `adminPassword` 和 `adminGroups`**：这两个字段保留是为了兼容旧 `config.json`，但当前版本未使用。WebUI 鉴权改为基于数据库的用户账号系统（见 [首次配置](#首次配置)），无需在 `config.json` 中设置密码。
+> **配置文件位置变更**：旧版本把 `config.json` 写在项目根目录（不在 Docker 挂载卷内，导致重启丢失、手动编辑不生效）。现在统一放在 `data/config.json`。升级时若检测到根目录存在旧的 `config.json`，会在首次启动时自动迁移到 `data/` 并保留你的设置，无需手动操作。
+
+> **关于 `adminPassword` 和 `adminGroups`**：`adminGroups` 现已启用，用于限制管理类聊天命令只能由指定 TeamSpeak 服务器组运行（为空 = 不限制），详见 [TeamSpeak 命令权限](#teamspeak-命令权限管理类命令限制)。`adminPassword` 仍为旧版预留字段、当前版本未使用——WebUI 鉴权改为基于数据库的用户账号系统（见 [首次配置](#首次配置)），无需在 `config.json` 中设置密码。
 
 ### 反向代理部署注意事项
 
@@ -499,6 +800,9 @@ A：确保机器人和你在同一个频道。检查音量（`!vol 75`）。部
 **Q：提示"无法获取播放链接"？**
 A：在设置页面扫码登录音乐账号。许多歌曲需要登录后才能播放。
 
+**Q：同名歌曲 `!play` 只能播到最热门的那首，怎么播放指定的版本？**
+A：`!play <歌名>` 默认取最热门的匹配项。要播放同名的另一首，有三种方式：(1) 先 `!search <歌名>` 列出带序号的结果，再 `!play #序号` 选择；(2) `!play id:<歌曲id>` 按 id 精确播放；(3) 直接粘贴歌曲链接，如 `!play https://music.163.com/song?id=442867526`（也支持 QQ / B站 链接）。在 WebUI 中则可直接在搜索结果列表里点选任意同名歌曲。
+
 **Q：如何更换机器人所在频道？**
 A：使用 `!move <频道名>` 命令，或在设置页面创建机器人时指定默认频道。
 
@@ -506,7 +810,16 @@ A：使用 `!move <频道名>` 命令，或在设置页面创建机器人时指
 A：可以。在设置页面创建多个实例，分别连接不同的 TS 服务器或频道。
 
 **Q：端口 3200 被占用？**
-A：QQ 音乐 API 启动时自动监听 3200 端口。如果之前的进程还在运行，程序会自动复用。如需重启可手动结束 `node` 进程。
+A：QQ 音乐 API 启动时会监听 `config.json` 里的 `qqMusicApiPort`（默认 **3200**），客户端也用同一个端口发请求，二者始终一致。如果之前的进程还在运行，程序会自动复用。如需改端口，改 `qqMusicApiPort` 后重启即可；如需重启可手动结束 `node` 进程。
+
+**Q：日志里 `baseURL` 是 3200，但 QQ API 实际监听在 3300？（二维码不弹）**
+A：这是**旧版本**（或过期的 `latest` Docker 镜像）才有的问题：早期实现用的上游包默认端口是 3300，而客户端 `baseURL` 已经是 3200，两边对不上，取二维码时就 `ECONNREFUSED 127.0.0.1:3200`。当前版本已把内嵌 QQ 音乐 API **强制绑定到 `qqMusicApiPort`（默认 3200）**，并在启动前把上游包读取的 `PORT` 环境变量对齐到该端口，二者不可能再错位。修复方法：**拉取最新镜像并重启**（`docker compose pull && docker compose up -d`），或用 `npm ci && npm run build` 更新到最新代码。启动后可在日志里确认那行 `QQ Music API started`，其 `port` 字段就是实际监听端口。
+
+**Q：QQ 音乐二维码不弹 / 扫码登录失败 / cookie 无法使用？**
+A：通常是内置的 QQ 音乐 API 服务没起来——它一旦没监听 `qqMusicApiPort`（默认 3200）端口，机器人去取二维码就会拿到 `ECONNREFUSED 127.0.0.1:3200`，于是二维码不显示，登录和 cookie 也全失效。先看日志里 QQ API 的启动报错：
+- 报 `ERR_REQUIRE_ESM`：装到了不兼容的 `@sansenjian/qq-music-api` 版本。本项目把它锁在 **`~2.4.0`**（需要 **Node ≥ 20.17 / 22.9**）；务必用 `npm ci` 或 `npm install` 让版本与锁文件一致，**不要**手动 `npm update` 把它升级或降级到不兼容的中间版本（2.3.0/2.3.1 是纯 ESM、会触发此错）。
+- 报 Node 版本不满足：升级 Node 到 ≥ 20.17，或将该依赖降到 `~2.2.10`（无此 Node 要求）后重装。
+修好版本后重新 `npm install && npm run build` 并重启即可。
 
 **Q：播放歌曲时报 FFmpeg EACCES 错误？**
 A：`ffmpeg-static` 内置的 FFmpeg 二进制文件缺少执行权限。程序已自动尝试修复，如果仍然失败，请手动执行：
@@ -531,7 +844,16 @@ A：`git pull` 拉取最新代码，然后 `npm install && npm run build && npm
 A：直接操作 SQLite 数据库。最简单的办法是清空 `users` 表然后重新进入 first-run 流程：`sqlite3 data/tsmusicbot.db "DELETE FROM users; DELETE FROM sessions;"`，重启后浏览器会自动跳转 `/first-run` 让你重新创建管理员。详细方法见 [从 WebUI 无鉴权版本升级](#从-webui-无鉴权版本升级重要)。
 
 **Q：成员（member）能做什么？不能做什么？**
-A：成员可以：管理机器人（启动/停止/创建/编辑）、控制播放（搜索/播放/队列）、登录音乐平台账号、修改自己的密码。成员**不能**：管理其他用户、查看操作审计日志、降级或删除管理员。
+A：成员默认可以：管理机器人（启动/停止/创建/编辑）、控制播放（搜索/播放/队列）、登录音乐平台账号、修改自己的密码。成员**始终不能**：管理其他用户、查看操作审计日志、降级或删除管理员。此外管理员可在 **设置 → 用户管理** 为每个成员单独**收紧权限**：勾选允许的能力（播放控制 / 队列 / 机器人管理 / 平台登录 / 音质）以及可操作的机器人白名单——未授权的能力会返回 403，未授权的机器人对该成员不可见也不可控。管理员不受任何限制。
+
+**Q：收藏的歌单存在哪里？其他用户能看到吗？**
+A：收藏按用户存储在本地 SQLite 数据库（`favorite_playlists` 表），仅本人可见，登录后跨设备同步。在首页、搜索结果或歌单页点击收藏图标即可增删。
+
+**Q：什么是"专属链接"？怎么用？**
+A：通过 `/bot/<机器人ID>` 打开 WebUI 会把界面锁定到该机器人（顶部显示"专属模式"，刷新后保持），适合把单台机器人的控制页分享给特定用户。点击"退出"可返回多机器人视图。注意：专属链接只是 UI 层的锁定，真正的访问控制由成员权限（机器人白名单）在后端强制。
+
+**Q：机器人播放时突然自动暂停了？**
+A：这是"频道无人时自动暂停"功能：当机器人所在频道没有其他人时会自动暂停，有人加入后自动恢复，避免空播。该功能**默认关闭**，仅在你于 **设置 → 行为设置** 开启后生效；如需停用，在同一页面关闭即可。（占用检测依赖 TeamSpeak 的 `clientlist` 命令，部分服务器在频道有其他人时可能查询失败——此时机器人会按"占用情况未知"处理，不会误暂停。）
 
 **Q：如何把某个用户从成员升级为管理员？**
 A：管理员登录后进入 **设置 → 用户管理**，点击对应用户的"提升管理员"按钮即可。降级同理（"降为成员"按钮）。系统会阻止降级最后一位管理员。
@@ -554,7 +876,67 @@ A：本项目内置 `/login` 限流（每 IP 每分钟 5 次），但生产部
 
 > 完整历史请查看 [git log](https://github.com/ZHANGTIANYAO1/teamspeak-music-bot/commits/main) 或 [Releases](https://github.com/ZHANGTIANYAO1/teamspeak-music-bot/releases)。这里只列出重要变更和面向用户的破坏性改动。
 
-### 最新版本
+### 最新版本 — v1.11.1：修复 `!help` 触发机器人自动点歌
+
+**丢弃自回显消息（[PR #135](https://github.com/ZHANGTIANYAO1/teamspeak-music-bot/pull/135)，感谢 [@EvolvedGhost](https://github.com/EvolvedGhost)）**
+
+- 修复输入 `!help` 后机器人会自己点一首歌开始播放的问题：帮助文本超过 TeamSpeak 单条消息上限被分段发送，而 TeamSpeak 会把 bot 自己发到频道的消息回推给它自己，第二段恰好以 `!artist ...` 开头，被误当作新命令解析执行。
+- 现在在协议层丢弃发送者为机器人自身的消息，机器人不再响应任何自己发出的文本，所有超长分段输出均安全。无配置变化，升级无需任何操作。
+
+### v1.11.0 — 播放清单持久化 / 设置保留 / 自定义默认音源
+
+**保存/加载播放清单 + 队列持久化（[#119](https://github.com/ZHANGTIANYAO1/teamspeak-music-bot/issues/119)）——三项开关均默认关闭，升级无行为变化**
+
+- **保存/加载播放清单（`savedQueuesEnabled`，默认关闭，管理员开关）**：开启后，可在网页「已存队列」页或聊天命令保存当前队列为清单、随时**替换**加载或**追加**到队列末尾。网页保存可选「共享」（否则私有到当前用户）；聊天命令始终进入共享清单。新增聊天命令 `!save <名称>` / `!load [-a] <名称>` / `!queues`（未启用时回复「此功能未启用」）。上限：每个所有者 ≤ 50 份清单，每份 ≤ 1000 首。
+- **重启后自动恢复并继续播放队列**（同由 `savedQueuesEnabled` 门控）：机器人连接后会恢复上次的队列并继续播放。**说明**：只能从当前曲目的**开头**恢复（不记忆播放进度，链接重新解析）；**Spotify 恢复为尽力而为**（依赖 sidecar 重新可用），其他音源可靠。
+- **单曲直接播放不清空队列（`playKeepsQueue`，默认关闭，独立开关）**：开启后，直接播放单曲会插入到当前歌曲之后并立即播放、播完继续原队列，而不是清空整个队列。仅影响单曲的「直接播放」；歌单 / 专辑 / 电台仍会替换队列。
+- 三项均在 设置 → 行为设置 中开关，保存即时生效，无需重启。
+
+**重启后保留播放设置（[#125](https://github.com/ZHANGTIANYAO1/teamspeak-music-bot/issues/125)）**
+
+- **音量与播放模式**现按机器人持久化到数据库（`bot_instances` 表新增 `volume` / `play_mode` 列，自动迁移），**各平台音质**持久化到 `config.json` 的 `audioQuality` 字段；重启后自动恢复，不再需要每次手动重调。
+- 聊天命令、WebUI、REST 三种入口的改动都会落盘；`!fm` / `!artist` 的临时随机 / 循环切换**不会**覆盖你用 `!mode` 显式保存的偏好。播放队列、当前歌曲与播放进度仍不持久化（队列恢复见上方 `savedQueuesEnabled`）。
+
+**自定义默认音源（[#126](https://github.com/ZHANGTIANYAO1/teamspeak-music-bot/issues/126)）**
+
+- `config.json` 新增可选字段 `defaultPlatform`，或在 **设置 → 默认音源** 下拉选择：设定后，不带平台标志的 `!play` / `!search` / `!fm` 走你指定的音源（例如设为 `bilibili` 后点播 B 站视频音乐无需每次加 `-b`）。
+- 留空 / `null` 恢复原有固定优先级（网易云 → QQ → 酷狗 → Jellyfin → B 站 → YouTube）；若指定音源未启用或值非法，自动回退到优先级，保存即时生效、无需重启。
+
+**修复与加固**
+
+- **QQ 音乐 API 端口对齐（[#122](https://github.com/ZHANGTIANYAO1/teamspeak-music-bot/issues/122)）**：内嵌 QQ 音乐 API sidecar 现在保证绑定到 `qqMusicApiPort`（与客户端请求端口一致），启动日志改为打印**实际绑定端口**便于排查。若你在旧 `latest` 镜像上遇到「日志里 baseURL 是 3200、服务却在 3300」导致二维码不显示，请 `docker compose pull` 重新拉取镜像。
+- **WebUI 不再被搜索引擎收录（[#128](https://github.com/ZHANGTIANYAO1/teamspeak-music-bot/issues/128)）**：所有响应加 `X-Robots-Tag: noindex, nofollow`、新增 `/robots.txt`（Disallow 全站）、页面加 `robots` meta 标签。⚠️ 这只是阻止**收录**，不是访问控制——公网部署请务必依赖登录鉴权与反向代理，并且不要把自己的 WebUI 链接发到公开网页。
+- **`.gitignore` 补充 `.claude/`（[#127](https://github.com/ZHANGTIANYAO1/teamspeak-music-bot/issues/127)，感谢 [@ItsEricRao](https://github.com/ItsEricRao)）**：本地 Claude Code 配置不再被误提交（已从版本库取消跟踪，本地文件不受影响）。
+
+### v1.10.1 — Jellyfin 可选音源
+
+**Jellyfin 集成（[PR #123](https://github.com/ZHANGTIANYAO1/teamspeak-music-bot/pull/123)，由 [@ItsEricRao](https://github.com/ItsEricRao) 贡献；随后调整为可选音源）**
+
+- **Jellyfin 音源（可选，默认关闭）**：连接自建 [Jellyfin](https://jellyfin.org/) 服务器作为额外音源——搜索（歌曲 / 专辑 / 歌单，支持翻页）、懒解析直传播放、同步歌词、收藏 Instant Mix 电台（`!fm -j`）、首页「最近添加 / 播放最多 / 收藏 / 流派」区块、播放进度回报（PlayCount / 播放状态）。账号密码或 API Key 两种认证，在 设置 → Jellyfin 音乐库 打开「启用 Jellyfin 音源」即可，保存即时生效。详见 [可选：Jellyfin 音源](#可选jellyfin-音源)。
+- **enabledProviders 音源开关**：`config.json` 新增 `enabledProviders` 字段，默认 `["netease", "qq", "bilibili", "youtube", "kugou"]`——在线音源保持默认启用，**从旧版本升级无行为变化**；列表外的音源在聊天命令 / REST / WebUI 中一律不可用，网易云 / QQ 停用时其内嵌 API 服务（端口 3001 / 3200）不再启动。
+- **新增 `-j`（Jellyfin）与 `-n`（网易云）平台标志**；不带标志的 `!play` / `!search` / `!fm` 等走固定优先级中第一个已启用的音源（默认配置下即网易云，行为与旧版一致）。
+- ⚠️ **v1.10.0 初版曾短暂把默认音源设为 Jellyfin-only，现已回退**。若你在该版本保存过设置导致 `config.json` 中为 `"enabledProviders": ["jellyfin"]`，请手动把在线音源加回（详见 [更新升级](#关于-enabledproviders-音源开关v1100-起)）。
+- **QQ 按 ID 播放空歌名修复**（[PR #124](https://github.com/ZHANGTIANYAO1/teamspeak-music-bot/pull/124)，感谢 [@Slldyd2077](https://github.com/Slldyd2077)）：按 ID 播放 QQ 歌曲时回填歌曲元数据，TS 端不再显示空歌名。
+
+### v1.9.0 及更早
+
+**功能增强：Spotify 音源（实验性）/ 搜索结果翻页 / 细粒度权限 / 本地收藏 / 本地音频上传 / 专属链接 / 自动暂停 / QQ 雷达 FM**
+
+- **细粒度账号权限**（叠加在 admin / member 之上）：管理员可为每个成员勾选 5 项能力（`player.control` / `player.queue` / `bot.manage` / `platform.auth` / `quality`）和按机器人授权白名单；所有变更路由由后端 `requirePermission` / `requireBotAccess` 中间件逐请求强制校验，未授权返回 403，未授权的机器人对成员不可见（列表过滤，无 403-vs-404 枚举泄漏）。已有成员经一次性迁移获得全部能力，新成员默认基础能力。
+- **本地收藏歌单**：按用户存储的收藏（`favorite_playlists` 表 + `/api/favorites`），首页 / 搜索 / 歌单页一键收藏，跨设备同步。
+- **本地音频上传播放**：搜索页支持拖拽 / 选择本地音频上传（保存到 `data/local-audio`），上传后可像普通歌曲一样播放、下一首播放或加入队列；设置 → 行为设置 中新增「本地音频播放」开关，关闭后拒绝新的本地上传和本地歌曲播放请求。播放结束或停止 / 清空 / 替换队列时会从服务端删除已接收文件并更新索引。
+- **专属链接（单机器人锁定）**：`/bot/<id>` 打开时锁定到单台机器人，`?bot=<id>` 随刷新保持；与权限白名单组合，机器人下拉只显示"作用域 ∩ 可控"的机器人。
+- **频道无人时自动暂停**：机器人所在频道清空时暂停、有人加入时恢复（区分用户手动暂停，不会误恢复）；可在 设置 → 行为设置 开关（默认关闭）。占用检测在 `clientlist` 查询失败时按"未知"处理而非"无人"，避免有人在听时被误暂停。
+- **QQ 音乐雷达 / 私人 FM**：`!fm -q` 或 WebUI 启动 QQ 雷达推荐流（失败回退"猜你喜欢"），FM 自动续播现支持任意平台。
+- **#112 Spotify 音源（实验性）**：新增 Spotify 作为可选音源，默认关闭、需 Premium + 自建开发者应用（PKCE，无需 Client Secret）。采用混合 librespot 后端（Linux/Docker 用 go-librespot，Windows 用 Rust librespot），元数据走 Spotify Web API，可与现有音源混排入队。为 ToS 灰色地带的实验特性，详见 [Spotify 音源（实验性）](#spotify-音源实验性)。
+- **#115 搜索结果翻页**：WebUI 搜索现按来源、按分类（歌曲 / 歌单 / 专辑）提供「加载更多」，服务端新增 `offset` 分页，不再固定只返回首页 20 首 / 10 个歌单 / 10 张专辑。
+
+**Bug 修复**
+
+- **#116 `!lyrics` 只显示开头几行**：聊天命令曾把歌词截断为前 10 行，且长消息未分片会触及 TeamSpeak 单条约 1 KB 上限。现发送完整歌词，并按 UTF-8 字节安全地分割成多条消息（长回复通用分片，不再截断）。
+- **#86 config.json 未在首次运行生成**：配置文件改放到持久化的 `data/config.json`（旧版写在项目根目录，不在 Docker 卷内，导致重启丢失、手动编辑不生效）；升级时自动把根目录旧配置迁移到 `data/` 并保留你的设置。
+- **#89 B站长音频约 16 分钟被暂停且无法继续**：ffmpeg 增加 `-reconnect_at_eof`（B站 CDN 会在 token/会话到期时提前关闭连接造成 EOF），并新增"远离结尾的卡死看门狗"——彻底卡死的流会自动推进到下一首而不是永久静音。
+- **#84 音量曲线不顺滑**：0–100 改为连续单调曲线 `0.2x + 0.8x^8`（消除 80–99 的"死区"与 100 处的突跳，满响度仍保留在 100）。
 
 **WebUI 鉴权与权限系统**
 
@@ -566,7 +948,8 @@ A：本项目内置 `/login` 限流（每 IP 每分钟 5 次），但生产部
 - **会话存储**：服务端 SQLite 表 `sessions`，存储 sha256(token)；浏览器只持有原始 token cookie。7 天 TTL，每小时滚动续期。同账号最多 10 个并发会话（超出剔除最旧）。
 - **登录限流**：每 IP 每分钟 5 次 `/login` + 3 次 `/setup`，命中返回 429 + `Retry-After`。
 - **CSRF & 安全头**：所有 mutating 请求强制 `Origin`/`Referer` 同源；响应携带 `X-Frame-Options: DENY` 和 `Content-Security-Policy: frame-ancestors 'none'`（防点击劫持）。
-- **配置变更**：反向代理部署务必 `"trustProxy": true`（详见 [反向代理部署注意事项](#反向代理部署注意事项)）。`config.adminPassword` / `adminGroups` 字段保留以兼容旧 `config.json`，但不再影响任何行为。
+- **搜索引擎隐身（防止实例被收录，issue #128）**：为避免部署实例的 WebUI 被搜索引擎收录、被陌生人搜到控制页，采用纵深防御——所有响应携带 `X-Robots-Tag: noindex, nofollow`，`/robots.txt` 返回 `User-agent: * / Disallow: /`，`index.html` 内置 `<meta name="robots" content="noindex, nofollow">`（专属链接 `/bot/<id>` 等所有页面同样覆盖）。这些只阻止「被索引」，不是访问控制——**请不要把自己的 WebUI 链接发到公开网页 / 论坛 / 聊天群**，真正的防护来自登录鉴权与反向代理。
+- **配置变更**：反向代理部署务必 `"trustProxy": true`（详见 [反向代理部署注意事项](#反向代理部署注意事项)）。`config.adminGroups` 现已启用，用于限制管理类聊天命令只能由指定 TeamSpeak 服务器组运行（为空 = 不限制，详见 [TeamSpeak 命令权限](#teamspeak-命令权限管理类命令限制)）；`config.adminPassword` 仍为旧版预留字段，保留以兼容旧 `config.json`，当前未使用。
 
 ### v0.x — Bot Profile 自动更新与协议层升级
 
@@ -638,6 +1021,7 @@ A：本项目内置 `/login` 限流（每 IP 每分钟 5 次），但生产部
 - **初始 TS3/TS6 双协议支持**：自动协议检测（TS3 port 10011 vs TS6 port 10080）、TS6 HTTP Query 客户端、数据库持久化 `serverProtocol` / `ts6ApiKey`。
 - **多机器人架构**：支持同一进程中运行多个机器人实例，独立队列、进度、音量；WebUI 一键切换。
 - **网易云 / QQ 音乐 / 哔哩哔哩**：三平台原生音源，QR 码登录，Cookie 持久化。
+- **酷狗音乐音源**：第四个原生音源（直连 API，无 npm 依赖 / 无内嵌服务），覆盖搜索 / 播放 / KRC 歌词 / 专辑 / QR 登录，登录后支持每日推荐 / 推荐歌单 / 我的歌单 / 私人电台与歌曲封面。
 - **Docker & systemd 部署**：一键部署脚本，数据卷持久化，自动重启支持。
 
 ## 致谢
@@ -646,6 +1030,8 @@ A：本项目内置 `/login` 限流（每 IP 每分钟 5 次），但生产部
 
 | 项目 | 说明 |
 |------|------|
+| [Jellyfin](https://github.com/jellyfin/jellyfin) | 自由软件媒体服务器（本项目的可选自建音源） |
+| [ItsEricRao](https://github.com/ItsEricRao) | Jellyfin 音源集成贡献者（[PR #123](https://github.com/ZHANGTIANYAO1/teamspeak-music-bot/pull/123)） |
 | [yichen11818/NeteaseTSBot](https://github.com/yichen11818/NeteaseTSBot) | TS6 协议兼容参考（vendored tsproto 补丁） |
 | [Splamy/TS3AudioBot](https://github.com/Splamy/TS3AudioBot) | 优秀的 TeamSpeak 音频机器人框架 |
 | [TS3AudioBot-BiliBiliPlugin](https://github.com/xxmod/TS3AudioBot-BiliBiliPlugin) | 提供插件开发参考 |
@@ -658,6 +1044,7 @@ A：本项目内置 `/login` 限流（每 IP 每分钟 5 次），但生产部
 | [@sansenjian/qq-music-api](https://github.com/sansenjian/qq-music-api) | QQ 音乐 API 活跃维护版本 |
 | [@honeybbq/teamspeak-client](https://www.npmjs.com/package/@honeybbq/teamspeak-client) | TS3 完整客户端协议实现 |
 | [bilibili-API-collect](https://github.com/SocialSisterYi/bilibili-API-collect) | 哔哩哔哩 API 文档 |
+| [MakcRe/KuGouMusicApi](https://github.com/MakcRe/KuGouMusicApi) | 酷狗音乐 API 参考（请求签名 / KRC 歌词解码 / 设备注册移植来源，MIT 许可） |
 
 ## 开源许可
 

docs/superpowers/plans/2026-05-30-autopause-empty-channel.md

@@ -0,0 +1,196 @@
+# Auto-pause on Empty Channel — Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: superpowers:subagent-driven-development. Steps use checkbox (`- [ ]`) syntax.
+
+**Goal:** Auto-pause playback when the bot's channel empties (no disconnect) and auto-resume when someone returns — only resuming tracks we auto-paused — gated by the existing global `autoPauseOnEmpty` flag.
+
+**Architecture:** A pure decision function decides pause/resume from (player state, autoPaused, flag, userCount). `BotInstance` owns an `autoPaused` flag and a `checkChannelOccupancy()` that the existing 30s idle poll AND new TS enter/leave/move events both call. The toggle is wired into `/api/bot/settings` + the Settings UI.
+
+**Tech:** Node ESM + TS, Vitest, Express, Vue 3.
+
+**Spec:** `docs/superpowers/specs/2026-05-30-autopause-empty-channel-design.md`
+
+---
+
+## Task 1: Pure occupancy-decision function
+
+**Files:** Create `src/bot/auto-pause.ts`, `src/bot/auto-pause.test.ts`.
+
+- [ ] **Step 1 — failing test** `src/bot/auto-pause.test.ts`:
+
+```typescript
+import { describe, it, expect } from "vitest";
+import { decideOccupancyAction } from "./auto-pause.js";
+
+describe("decideOccupancyAction", () => {
+  // (playerState, autoPaused, enabled, userCount) => "pause" | "resume" | "none"
+  it("pauses when empty while playing and enabled", () => {
+    expect(decideOccupancyAction("playing", false, true, 0)).toBe("pause");
+  });
+  it("does not pause when the feature is disabled", () => {
+    expect(decideOccupancyAction("playing", false, false, 0)).toBe("none");
+  });
+  it("does not pause when idle (nothing playing)", () => {
+    expect(decideOccupancyAction("idle", false, true, 0)).toBe("none");
+  });
+  it("does not pause when already paused", () => {
+    expect(decideOccupancyAction("paused", false, true, 0)).toBe("none");
+  });
+  it("resumes when re-populated and we auto-paused", () => {
+    expect(decideOccupancyAction("paused", true, true, 2)).toBe("resume");
+  });
+  it("does NOT resume a user-paused track on re-population", () => {
+    expect(decideOccupancyAction("paused", false, true, 2)).toBe("none");
+  });
+  it("does nothing when re-populated and already playing", () => {
+    expect(decideOccupancyAction("playing", false, true, 2)).toBe("none");
+  });
+  it("resume is independent of the enabled flag (we already auto-paused)", () => {
+    expect(decideOccupancyAction("paused", true, false, 1)).toBe("resume");
+  });
+});
+```
+
+- [ ] **Step 2 — run, expect fail:** `npx vitest run src/bot/auto-pause.test.ts` → module missing.
+
+- [ ] **Step 3 — implement** `src/bot/auto-pause.ts`:
+
+```typescript
+export type PlayerStateName = "idle" | "playing" | "paused";
+export type OccupancyAction = "pause" | "resume" | "none";
+
+/**
+ * Decide what auto-pause should do given the channel occupancy.
+ * - empty (userCount <= 0): pause iff enabled and currently playing.
+ * - re-populated (userCount > 0): resume iff we previously auto-paused and are still paused.
+ * `autoPaused` distinguishes our auto-pause from a user pause, so user pauses are never resumed.
+ */
+export function decideOccupancyAction(
+  playerState: PlayerStateName,
+  autoPaused: boolean,
+  enabled: boolean,
+  userCount: number,
+): OccupancyAction {
+  const empty = userCount <= 0;
+  if (empty) {
+    if (enabled && playerState === "playing") return "pause";
+    return "none";
+  }
+  if (autoPaused && playerState === "paused") return "resume";
+  return "none";
+}
+```
+
+- [ ] **Step 4 — run, expect pass:** `npx vitest run src/bot/auto-pause.test.ts` → 8 pass.
+- [ ] **Step 5 — commit:** `git add src/bot/auto-pause.ts src/bot/auto-pause.test.ts && git commit -m "feat(autopause): pure occupancy-decision function"`
+
+---
+
+## Task 2: Wire decision into BotInstance (autoPaused flag + checkChannelOccupancy)
+
+**Files:** Modify `src/bot/instance.ts`.
+
+Context: `_startIdlePoller` (~lines 190-206) polls every 30s, computes `userCount = (await getClientsInChannel()).length - 1`, and calls `_scheduleIdleCheck()` (empty) / `_cancelIdleTimer()` (occupied). `cmdPause`/`cmdResume` (~484-494), `cmdStop` (~496-505), and the playback start (`cmdPlay`/resolveAndPlay) wrap `player`. There's an unused `channelUserCount` field (~line 68). The instance has `this.config` (BotConfig) and `this.player`.
+
+- [ ] **Step 1 — add state + helper.** Add a private field `private autoPaused = false;`. Create a method that centralizes occupancy handling and is called with a freshly-computed userCount:
+
+```typescript
+import { decideOccupancyAction } from "./auto-pause.js";
+
+private handleOccupancy(userCount: number): void {
+  // idle-disconnect (unchanged behavior)
+  if (userCount <= 0) this._scheduleIdleCheck();
+  else this._cancelIdleTimer();
+
+  // auto-pause
+  const action = decideOccupancyAction(
+    this.player.getState() as "idle" | "playing" | "paused",
+    this.autoPaused,
+    this.config.autoPauseOnEmpty,
+    userCount,
+  );
+  if (action === "pause") {
+    this.player.pause();
+    this.autoPaused = true;
+    this.emit("stateChange");
+  } else if (action === "resume") {
+    this.player.resume();
+    this.autoPaused = false;
+    this.emit("stateChange");
+  }
+}
+```
+
+- [ ] **Step 2 — route the idle poller through it.** In `_startIdlePoller`, replace the inline `userCount`→schedule/cancel logic with: compute `userCount` then `this.handleOccupancy(userCount)`. (Keep the 30s interval + the same getClientsInChannel call + error handling.) Remove the now-redundant inline schedule/cancel branch (it lives in `handleOccupancy`).
+
+- [ ] **Step 3 — clear autoPaused on user actions + lifecycle.** In `cmdPause`, `cmdResume`, `cmdStop`, and the play-start path (`cmdPlay`/wherever playback (re)starts), set `this.autoPaused = false`. In the `disconnected` handler and on (re)connect, set `this.autoPaused = false`. (These ensure a user pause is never auto-resumed and the flag resets across connections.)
+
+- [ ] **Step 4 — `updateAutoPause`.** Add (mirrors `updateIdleTimeout`):
+
+```typescript
+updateAutoPause(enabled: boolean): void {
+  this.config.autoPauseOnEmpty = enabled;
+  // if turning off, leave current playback as-is; if a track was auto-paused, optionally resume:
+  if (!enabled && this.autoPaused && this.player.getState() === "paused") {
+    this.player.resume();
+    this.autoPaused = false;
+    this.emit("stateChange");
+  }
+}
+```
+
+- [ ] **Step 5 — verify:** `npx tsc --noEmit` → exit 0. `npx vitest run src/bot src/audio` → pass (existing tests unaffected).
+- [ ] **Step 6 — commit:** `git add src/bot/instance.ts && git commit -m "feat(autopause): drive pause/resume from channel occupancy in BotInstance"`
+
+---
+
+## Task 3: Re-emit TS member events for instant reaction
+
+**Files:** Modify `src/ts-protocol/client.ts`, `src/bot/instance.ts`.
+
+Context: `client.ts` forwards `textMessage`/`disconnected`/`connected` and only debug-logs `clientEnter` (~lines 219-224); `clientLeave`/`clientMoved` are not handled. `BotInstance.setupTsEvents()` (~lines 132-156) wires tsClient events.
+
+- [ ] **Step 1 — re-emit in client.ts.** Where `clientEnter` is logged, also `this.emit("clientEnter", info)`. Add subscriptions for `clientLeave` and `clientMoved` that `this.emit(...)` them upward (match the existing forwarding style; just propagate, no payload transformation needed since the instance re-queries).
+
+- [ ] **Step 2 — react in instance.ts.** In `setupTsEvents()`, add handlers: on `clientEnter` / `clientLeave` / `clientMoved`, call a small `async refreshOccupancy()` that does `const clients = await this.getClientsInChannel(); this.handleOccupancy(clients.length - 1);` (guarded with try/catch + only when connected). This gives near-instant pause/resume; the 30s poll remains the fallback.
+
+- [ ] **Step 3 — verify:** `npx tsc --noEmit` → 0. `npx vitest run src/bot` → pass.
+- [ ] **Step 4 — commit:** `git add src/ts-protocol/client.ts src/bot/instance.ts && git commit -m "feat(autopause): re-emit client enter/leave/move for instant pause/resume"`
+
+---
+
+## Task 4: API wiring for the toggle
+
+**Files:** Modify `src/web/api/bot.ts`; add/extend a test.
+
+Context: `GET /api/bot/settings` returns `{ idleTimeoutMinutes }`; `POST /api/bot/settings` validates `idleTimeoutMinutes`, sets `config.idleTimeoutMinutes`, `saveConfig`, then loops `botManager.getAllBots()` → `bot.updateIdleTimeout(...)`. This route is `requirePermission("bot.manage")`-gated.
+
+- [ ] **Step 1 — failing API test** (extend the existing bot settings test or add one): `GET /api/bot/settings` returns `autoPauseOnEmpty` (boolean); `POST /api/bot/settings` with `{ autoPauseOnEmpty: false }` persists it (a follow-up GET reflects false) and calls `updateAutoPause` on bots. Model the harness on the existing settings test.
+
+- [ ] **Step 2 — run, expect fail.**
+
+- [ ] **Step 3 — implement.** In `GET /settings`, add `autoPauseOnEmpty: options.config.autoPauseOnEmpty` to the response. In `POST /settings`, if `typeof req.body.autoPauseOnEmpty === "boolean"`, set `config.autoPauseOnEmpty`, include it in the `saveConfig`, and loop bots calling `bot.updateAutoPause(config.autoPauseOnEmpty)`. Keep the existing `idleTimeoutMinutes` handling intact (handle both fields in one save).
+
+- [ ] **Step 4 — verify:** `npx vitest run src/web` → pass; `npx tsc --noEmit` → 0.
+- [ ] **Step 5 — commit:** `git add src/web/api/bot.ts <test> && git commit -m "feat(autopause): expose autoPauseOnEmpty via /api/bot/settings"`
+
+---
+
+## Task 5: Frontend toggle in Settings
+
+**Files:** Modify `web/src/views/Settings.vue` (and the settings load/save it uses).
+
+Context: The **行为设置** section (already `v-if="can('bot.manage')"`) holds the idle-timeout control, loaded via `loadIdleTimeout()` (GET /api/bot/settings) and saved via `saveIdleTimeout()` (POST). Read these first.
+
+- [ ] **Step 1 — implement.** Add an `autoPauseOnEmpty` ref. In the settings load, populate it from the GET response. Add a checkbox/toggle in the 行为设置 section labelled e.g. "频道无人时自动暂停" bound to it, and include `autoPauseOnEmpty` in the POST payload of the save function (alongside `idleTimeoutMinutes`, or via its own save — match the existing pattern). Use existing form/toggle CSS classes.
+- [ ] **Step 2 — verify:** `cd web && npx vue-tsc --noEmit` → exit 0; read template back for correctness.
+- [ ] **Step 3 — commit:** `git add web/src/views/Settings.vue && git commit -m "feat(autopause): autoPauseOnEmpty toggle in Settings"`
+
+---
+
+## Final verification
+- [ ] `npx tsc --noEmit` → 0
+- [ ] `npx vitest run src/` → all pass
+- [ ] `cd web && npx vue-tsc --noEmit` → 0
+- [ ] `npm run build` → succeeds
+- [ ] Manual: with a bot playing, leave its channel → music auto-pauses (no disconnect); rejoin → resumes. Manually pause, leave, rejoin → stays paused. Toggle off in Settings → no auto-pause.

docs/superpowers/plans/2026-05-30-dedicated-link-scope.md

@@ -0,0 +1,156 @@
+# Dedicated-link Bot Scoping (+ refresh fix) — Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: superpowers:subagent-driven-development. Steps use checkbox (`- [ ]`) syntax.
+
+**Goal:** Opening a dedicated link locks the WebUI to that one bot (selector shows only it, switching disabled, with an explicit exit); the lock is carried in the URL (`?bot=<id>`) so it survives refresh — fixing item 4 too.
+
+**Architecture:** A `scopedBotId` in the Pinia player store is the runtime lock; the URL query `?bot=<id>` is the durable source of truth. A router `beforeEach` syncs scope from the query and re-attaches `?bot` across in-app navigation while scoped. `BotRedirect` seeds it; Navbar renders the lock; graceful clear if the bot doesn't exist.
+
+**Tech:** Vue 3 + Pinia + vue-router, TypeScript. (Frontend isn't unit-tested in this repo → verify via `vue-tsc` + manual; extract one pure helper to unit-test.)
+
+**Spec:** `docs/superpowers/specs/2026-05-30-dedicated-link-scope-design.md`
+
+---
+
+## Task 1: Store scope state + pure resolve helper (with test)
+
+**Files:** Modify `web/src/stores/player.ts`; create `web/src/stores/scope.ts` + `web/src/stores/scope.test.ts`.
+
+READ `web/src/stores/player.ts` first: `activeBotId` state (~line 52), `setActiveBotId` action (~127-133), `fetchBots` (~196-198 default to bots[0]), `activeBot` getter (~73-75), and the localStorage pattern used by `theme` (~175-183) for reference (we are NOT using localStorage, but match code style).
+
+- [ ] **Step 1 — pure helper + failing test.** Create `web/src/stores/scope.ts`:
+
+```typescript
+/** Given the desired scoped id (from ?bot) and the known bot ids, decide the
+ * effective scope. Returns the id if it exists, else null (graceful clear:
+ * a stale/forbidden id never locks the UI). */
+export function resolveScopedBot(
+  requestedId: string | null | undefined,
+  knownBotIds: readonly string[],
+): string | null {
+  if (!requestedId) return null;
+  return knownBotIds.includes(requestedId) ? requestedId : null;
+}
+```
+
+`web/src/stores/scope.test.ts`:
+
+```typescript
+import { describe, it, expect } from "vitest";
+import { resolveScopedBot } from "./scope.js";
+
+describe("resolveScopedBot", () => {
+  it("returns null when no id requested", () => {
+    expect(resolveScopedBot(null, ["a", "b"])).toBeNull();
+    expect(resolveScopedBot(undefined, ["a"])).toBeNull();
+    expect(resolveScopedBot("", ["a"])).toBeNull();
+  });
+  it("returns the id when it exists in the bot list", () => {
+    expect(resolveScopedBot("b", ["a", "b"])).toBe("b");
+  });
+  it("clears (null) when the requested id is not a known bot", () => {
+    expect(resolveScopedBot("ghost", ["a", "b"])).toBeNull();
+  });
+});
+```
+
+- [ ] **Step 2 — run, expect fail:** `npx vitest run web/src/stores/scope.test.ts` → module missing.
+      (Note: the repo's vitest runs from root; this test lives under web/. If the root vitest config doesn't include web/src, run it via the web workspace: `cd web && npx vitest run src/stores/scope.test.ts`. Use whichever picks it up; confirm it FAILS first.)
+
+- [ ] **Step 3 — implement the helper** (code above).
+
+- [ ] **Step 4 — add scope state to `web/src/stores/player.ts`:**
+  - state: `scopedBotId: null as string | null`.
+  - getter: `isScoped: (state) => state.scopedBotId !== null`.
+  - actions:
+    - `setScope(id: string)` → `this.scopedBotId = id;` and also set `this.activeBotId = id` (scoped == active), then ensure that bot's queue is loaded like `setActiveBotId` does.
+    - `clearScope()` → `this.scopedBotId = null;`.
+    - `applyScopeFromQuery(requestedId: string | null)` → uses `resolveScopedBot(requestedId, this.bots.map(b => b.id))`; if result non-null → `setScope(result)`; if null and a scope was requested → `clearScope()`. (Called after bots are loaded.)
+  - Guard `setActiveBotId(id)`: at the top, `if (this.scopedBotId !== null && id !== this.scopedBotId) return;` so switching is blocked while scoped.
+
+- [ ] **Step 5 — run helper test, expect pass:** `cd web && npx vitest run src/stores/scope.test.ts` → 3 pass. `cd web && npx vue-tsc --noEmit` → exit 0.
+
+- [ ] **Step 6 — commit:** `git add web/src/stores/scope.ts web/src/stores/scope.test.ts web/src/stores/player.ts && git commit -m "feat(scope): player store scopedBotId + resolveScopedBot helper"`
+
+---
+
+## Task 2: Router guard — sync scope from `?bot` + preserve across navigation
+
+**Files:** Modify `web/src/router/index.ts`.
+
+READ the file: the existing `beforeEach` (~lines 36-60) handles needsSetup/auth. Add scope handling AFTER auth resolves (so we don't fight the login redirect). Import the player store (use it inside the guard via `usePlayerStore()` — Pinia is active by the time navigation runs).
+
+- [ ] **Step 1 — implement.** In `beforeEach`, after the existing auth/needsSetup logic decides the navigation is allowed to proceed to `to` (i.e., not redirecting to /login or /first-run), add:
+
+```typescript
+const store = usePlayerStore();
+const qBot = typeof to.query.bot === "string" ? to.query.bot : null;
+if (qBot) {
+  // entering/with a scope in the URL — store will validate against bots later
+  store.scopedBotId = qBot;        // tentative; applyScopeFromQuery (after fetchBots) confirms/clears
+  return next();
+}
+if (store.scopedBotId) {
+  // scoped but this navigation dropped ?bot → re-attach so the lock survives in-app nav + refresh
+  if (to.query.bot !== store.scopedBotId) {
+    return next({ ...to, query: { ...to.query, bot: store.scopedBotId } });
+  }
+}
+return next();
+```
+
+(Adapt to the file's existing `next()` style — it may use `next(...)`/return. Ensure this runs only for allowed navigations, not when redirecting to /login. The exit action in Task 4 calls `store.clearScope()` BEFORE navigating to `/`, so `store.scopedBotId` is null and the re-attach branch is skipped — that's how exit works.)
+
+- [ ] **Step 2 — verify:** `cd web && npx vue-tsc --noEmit` → exit 0. Re-read the guard to ensure no redirect loop (when `to.query.bot === store.scopedBotId`, it does NOT redirect again).
+
+- [ ] **Step 3 — commit:** `git add web/src/router/index.ts && git commit -m "feat(scope): router guard syncs + preserves ?bot across navigation"`
+
+---
+
+## Task 3: BotRedirect seeds the URL scope
+
+**Files:** Modify `web/src/views/BotRedirect.vue`.
+
+READ it: onMounted reads `route.params.id`, ensures `store.fetchBots()`, finds the bot; if found `store.setActiveBotId(id)` + `router.replace('/')`; else shows not-found.
+
+- [ ] **Step 1 — implement.** Change the found-branch to seed scope via the URL instead of bouncing to a bare `/`:
+  - keep the fetchBots + existence check,
+  - if found: `router.replace({ path: '/', query: { bot: botId } })` (the router guard + store will set the scope). Optionally also call `store.setScope(botId)` directly for immediacy.
+  - if not found: unchanged (show "机器人不存在或未加载").
+
+- [ ] **Step 2 — verify:** `cd web && npx vue-tsc --noEmit` → exit 0.
+- [ ] **Step 3 — commit:** `git add web/src/views/BotRedirect.vue && git commit -m "feat(scope): dedicated link seeds ?bot scope instead of bare redirect"`
+
+---
+
+## Task 4: Navbar lock UI + apply-scope-on-load
+
+**Files:** Modify `web/src/components/Navbar.vue`, `web/src/App.vue`.
+
+READ both: Navbar has `controllableBots` (computed) + the dropdown selector + `selectBot`; App.vue onMounted calls `playerStore.fetchBots()` (+ loadTheme/connect).
+
+- [ ] **Step 1 — Navbar lock.** When `store.isScoped`:
+  - render only the scoped bot (a `displayedBots` computed → if scoped, `controllableBots.filter(b => b.id === store.scopedBotId)`, else `controllableBots`),
+  - disable the dropdown open / switching (no chevron, or make the trigger non-interactive) so the user can't switch,
+  - hide other bots' "copy link" affordances (only the scoped bot remains anyway),
+  - show a small "专属模式" badge and an "退出" button → `store.clearScope(); router.push('/')` (clear BEFORE navigating so the guard doesn't re-attach `?bot`). Import `useRouter` if not present.
+  When not scoped: behavior unchanged.
+
+- [ ] **Step 2 — apply scope on load (App.vue).** After `fetchBots()` resolves in onMounted, call `playerStore.applyScopeFromQuery(routeBot)` where `routeBot` is the current `?bot` query (via `useRoute().query.bot` as string|null). This confirms a refreshed `?bot` against the loaded bots and sets activeBotId (or gracefully clears if the bot is gone). (If Task 2's guard already set `scopedBotId` tentatively, this validates it against the now-loaded bot list.)
+
+- [ ] **Step 3 — verify:** `cd web && npx vue-tsc --noEmit` → exit 0. Read templates back for valid syntax; confirm read-only displays aren't broken and the non-scoped path is unchanged.
+- [ ] **Step 4 — commit:** `git add web/src/components/Navbar.vue web/src/App.vue && git commit -m "feat(scope): lock Navbar selector to scoped bot + apply scope on load"`
+
+---
+
+## Final verification
+- [ ] `cd web && npx vue-tsc --noEmit` → exit 0
+- [ ] `npx tsc --noEmit` → exit 0 (backend unaffected)
+- [ ] `cd web && npx vitest run src/stores/scope.test.ts` (or root vitest if it includes web) → pass
+- [ ] `npm run build` → succeeds
+- [ ] Manual: open `/bot/<id>` → URL becomes `/?bot=<id>`, selector shows only that bot, switching disabled; **refresh → still locked** (item 4 fixed); navigate to Search → URL keeps `?bot`; refresh on Search → still locked; click 退出 → back to all bots (`/`, no `?bot`); open `/` directly → full multi-bot control; open `/?bot=<nonexistent>` → gracefully shows all bots (no lock).
+
+## Notes
+- Backend per-bot authorization (PR #80) is the real security boundary; this is a UX lock.
+- No localStorage — URL is the source of truth, so the lock is shareable and self-clearing.
+- Item 4 is fixed as a consequence of carrying `?bot` in the URL across refresh/navigation.

docs/superpowers/plans/2026-06-25-ts-command-permissions.md

@@ -0,0 +1,840 @@
+# TeamSpeak chat-command permission control — Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** Gate a fixed set of "admin" TeamSpeak chat commands (`stop`, `clear`, `remove`, `move`, `vol`, `mode`) behind configured TS server-group IDs, opt-in and backward-compatible, configurable from the WebUI and `config.json`.
+
+**Architecture:** A pure helper `canRunCommand(name, invokerGroups, adminGroups)` decides allow/deny. The chat handler `handleTextMessage` (NOT the WebUI-shared `executeCommand`) consults it before executing, performs a best-effort group lookup when the sender's groups weren't delivered with the event, fails closed, and replies on deny. The privileged groups live in the already-declared `config.adminGroups`, surfaced through the existing `GET/POST /api/bot/settings` endpoints and an admin-only Settings.vue section.
+
+**Tech Stack:** Node 20, TypeScript (ESM), Express 5, Vitest + supertest (backend), Vue 3 + `vue-tsc` (frontend), `@honeybbq/teamspeak-client`.
+
+## Global Constraints
+
+- **ESM import specifiers:** every relative import ends in `.js` even in `.ts` files (e.g. `import { canRunCommand } from "./commands.js"`).
+- **Admin command set (exact, single source of truth):** `stop`, `clear`, `remove`, `move`, `vol`, `mode`. Everything else is public. (Note: `follow` is intentionally NOT admin — it becomes public.)
+- **Enforcement is opt-in / backward-compatible:** `config.adminGroups === []` (the default) ⇒ no enforcement; admin commands stay open to everyone exactly as today.
+- **Fail closed:** an admin command, with enforcement on, whose sender groups cannot be determined (even after fallback) is **denied**.
+- **Group-id normalization:** `invokerGroups` are strings, `adminGroups` are numbers — compare as the same type so `"6"` matches `6`.
+- **Denial reply text (exact):** `⛔ 需要管理员权限（该命令仅限管理员服务器组）`.
+- **`adminGroups` validation:** array of non-negative integers; filter out everything else; ignore a non-array value entirely.
+- **Live config:** `BotInstance` shares the same `config` object the router mutates; the gate reads `this.config.adminGroups` live (no restart, no propagation call).
+- **Per-task tests:** run `npx vitest run <file>` (targets `.ts` directly). Before any full `npm test`, run `rm -rf dist` first — a stale untracked `dist/` makes vitest double-run compiled `.test.js` copies (known environment quirk). The repo path contains spaces (`/c/Users/saopig1/Music/teamspeak music bot`) — quote it.
+- **Frontend type-check:** `cd web && npx vue-tsc --noEmit` (must be clean).
+- **TDD + frequent commits:** every task is red→green→commit. Keep project `tsc`/`vitest` green after each task.
+
+---
+
+### Task 1: `canRunCommand` helper + admin-set as single source of truth
+
+**Files:**
+- Modify: `src/bot/commands.ts` (lines 8-16 sets; line 59-61 `isAdminCommand`)
+- Test: `src/bot/commands.test.ts` (append a new `describe` block)
+
+**Interfaces:**
+- Consumes: nothing from other tasks.
+- Produces:
+  - `export const ADMIN_COMMANDS: Set<string>` = `{stop, clear, remove, move, vol, mode}`
+  - `export function isAdminCommand(commandName: string): boolean` (unchanged signature)
+  - `export function canRunCommand(commandName: string, invokerGroups: readonly (string | number)[], adminGroups: readonly number[]): boolean` — consumed by Task 3.
+
+- [ ] **Step 1: Write the failing tests**
+
+Append to `src/bot/commands.test.ts`:
+
+```ts
+import { canRunCommand, isAdminCommand } from "./commands.js";
+
+describe("isAdminCommand classification", () => {
+  it("treats stop/clear/remove/move/vol/mode as admin", () => {
+    for (const c of ["stop", "clear", "remove", "move", "vol", "mode"]) {
+      expect(isAdminCommand(c)).toBe(true);
+    }
+  });
+  it("treats follow and play as NOT admin", () => {
+    expect(isAdminCommand("follow")).toBe(false);
+    expect(isAdminCommand("play")).toBe(false);
+  });
+});
+
+describe("canRunCommand", () => {
+  it("allows any public command regardless of groups", () => {
+    expect(canRunCommand("play", [], [6])).toBe(true);
+    expect(canRunCommand("follow", [], [6])).toBe(true);
+  });
+  it("allows admin command when enforcement is off (empty adminGroups)", () => {
+    expect(canRunCommand("stop", [], [])).toBe(true);
+  });
+  it("allows admin command when an invoker group matches (string vs number)", () => {
+    expect(canRunCommand("stop", ["6"], [6])).toBe(true);
+    expect(canRunCommand("stop", [6], [6])).toBe(true);
+    expect(canRunCommand("vol", ["8", "6"], [6])).toBe(true);
+  });
+  it("denies admin command when no invoker group matches", () => {
+    expect(canRunCommand("stop", ["8"], [6])).toBe(false);
+  });
+  it("denies admin command when invoker has no groups and enforcement is on", () => {
+    expect(canRunCommand("clear", [], [6])).toBe(false);
+  });
+});
+```
+
+- [ ] **Step 2: Run the tests to verify they fail**
+
+Run: `npx vitest run "src/bot/commands.test.ts"`
+Expected: FAIL — `canRunCommand` is not exported / not a function.
+
+- [ ] **Step 3: Implement the helper and tighten the admin set**
+
+In `src/bot/commands.ts`, delete the dead `PUBLIC_COMMANDS` export (nothing imports it; the admin set is the sole source of truth), set `ADMIN_COMMANDS` to the exact spec set (drop `follow`), and add `canRunCommand`. The file becomes:
+
+```ts
+export interface ParsedCommand {
+  name: string;
+  args: string;
+  rawArgs: string[];
+  flags: Set<string>;
+}
+
+/**
+ * The fixed set of "admin" chat commands. This is the SINGLE source of truth
+ * for which commands the permission gate restricts; reclassifying a command is
+ * a one-line edit here. Everything not in this set is public.
+ */
+export const ADMIN_COMMANDS = new Set([
+  "stop", "clear", "remove", "move", "vol", "mode",
+]);
+
+export function parseCommand(
+  message: string,
+  prefix: string,
+  aliases: Record<string, string> = {},
+): ParsedCommand | null {
+  const trimmed = message.trim();
+  if (!trimmed.startsWith(prefix)) return null;
+
+  const withoutPrefix = trimmed.slice(prefix.length);
+  if (!withoutPrefix) return null;
+
+  const parts = withoutPrefix.split(/\s+/);
+  let name = parts[0].toLowerCase();
+
+  if (aliases[name]) {
+    name = aliases[name];
+  }
+
+  const flags = new Set<string>();
+  const argParts: string[] = [];
+
+  for (let i = 1; i < parts.length; i++) {
+    if (
+      parts[i].startsWith("-") &&
+      parts[i].length === 2 &&
+      /[a-zA-Z]/.test(parts[i][1])
+    ) {
+      flags.add(parts[i][1].toLowerCase());
+    } else {
+      argParts.push(parts[i]);
+    }
+  }
+
+  return {
+    name,
+    args: argParts.join(" "),
+    rawArgs: argParts,
+    flags,
+  };
+}
+
+export function isAdminCommand(commandName: string): boolean {
+  return ADMIN_COMMANDS.has(commandName);
+}
+
+/**
+ * Decide whether a chat command may run, given the invoker's TS server groups
+ * and the configured admin groups. Pure + synchronous so it is trivially unit
+ * tested and reused by the async gate in BotInstance.
+ *
+ * Allowed iff: (1) it is a public command, OR (2) enforcement is off
+ * (adminGroups empty), OR (3) some invoker group is in adminGroups.
+ * invokerGroups (strings from TS) and adminGroups (numbers) are normalized to
+ * strings before comparison so "6" matches 6.
+ */
+export function canRunCommand(
+  commandName: string,
+  invokerGroups: readonly (string | number)[],
+  adminGroups: readonly number[],
+): boolean {
+  if (!isAdminCommand(commandName)) return true;
+  if (adminGroups.length === 0) return true;
+  const admin = new Set(adminGroups.map((g) => String(g)));
+  return invokerGroups.some((g) => admin.has(String(g)));
+}
+```
+
+- [ ] **Step 4: Run the tests to verify they pass**
+
+Run: `npx vitest run "src/bot/commands.test.ts"`
+Expected: PASS (parser tests + the new classification/canRunCommand tests).
+
+- [ ] **Step 5: Verify nothing else imported the deleted symbol**
+
+Run: `grep -rn "PUBLIC_COMMANDS" src/`
+Expected: no matches (confirms the deletion is safe).
+
+- [ ] **Step 6: Commit**
+
+```bash
+git add "src/bot/commands.ts" "src/bot/commands.test.ts"
+git commit -m "feat(commands): add canRunCommand gate helper + admin-set source of truth"
+```
+
+---
+
+### Task 2: Surface `invokerGroups` on `TS3TextMessage`
+
+**Files:**
+- Modify: `src/ts-protocol/client.ts` (interface lines 58-64; mapping lines 205-214)
+- Test: `src/ts-protocol/text-message.test.ts` (new)
+
+**Interfaces:**
+- Consumes: nothing from other tasks.
+- Produces:
+  - `TS3TextMessage` gains `invokerGroups: string[]`.
+  - `export function toTS3TextMessage(msg: TextMessage): TS3TextMessage` — a pure mapper, used by the `textMessage` event handler and unit-testable. Consumed (the field) by Task 3.
+
+- [ ] **Step 1: Write the failing test**
+
+Create `src/ts-protocol/text-message.test.ts`:
+
+```ts
+import { describe, it, expect } from "vitest";
+import { toTS3TextMessage } from "./client.js";
+import type { TextMessage } from "@honeybbq/teamspeak-client";
+
+function makeMsg(over: Partial<TextMessage> = {}): TextMessage {
+  return {
+    invokerName: "Alice",
+    invokerUID: "uid-abc",
+    message: "!stop",
+    invokerGroups: ["6", "8"],
+    targetMode: 2,
+    targetID: 0n,
+    invokerID: 5,
+    ...over,
+  };
+}
+
+describe("toTS3TextMessage", () => {
+  it("maps core fields and stringifies invokerID", () => {
+    const r = toTS3TextMessage(makeMsg());
+    expect(r.invokerName).toBe("Alice");
+    expect(r.invokerId).toBe("5");
+    expect(r.invokerUid).toBe("uid-abc");
+    expect(r.message).toBe("!stop");
+    expect(r.targetMode).toBe(2);
+  });
+
+  it("preserves the sender's server groups", () => {
+    expect(toTS3TextMessage(makeMsg({ invokerGroups: ["6"] })).invokerGroups).toEqual(["6"]);
+  });
+
+  it("defaults missing invokerGroups to an empty array", () => {
+    const partial = {
+      invokerName: "Bob",
+      invokerUID: "u",
+      message: "!stop",
+      targetMode: 1,
+      targetID: 0n,
+      invokerID: 7,
+    } as unknown as TextMessage;
+    expect(toTS3TextMessage(partial).invokerGroups).toEqual([]);
+  });
+});
+```
+
+- [ ] **Step 2: Run the test to verify it fails**
+
+Run: `npx vitest run "src/ts-protocol/text-message.test.ts"`
+Expected: FAIL — `toTS3TextMessage` is not exported.
+
+- [ ] **Step 3: Add the field and the pure mapper, and use it in the handler**
+
+In `src/ts-protocol/client.ts`, extend the interface (add `invokerGroups`):
+
+```ts
+export interface TS3TextMessage {
+  invokerName: string;
+  invokerId: string;
+  invokerUid: string;
+  message: string;
+  targetMode: number; // 1=private, 2=channel, 3=server
+  invokerGroups: string[]; // sender's TS server-group ids; [] when not in view cache
+}
+```
+
+Add the pure mapper just below the interface (still above the `TS3Client` class):
+
+```ts
+/**
+ * Map the library's TextMessage to our wrapper. Preserves invokerGroups (the
+ * sender's TS server groups), which the library populates only when the sender
+ * is in the bot's client-view cache; otherwise it is []. Used by the chat
+ * command permission gate.
+ */
+export function toTS3TextMessage(msg: TextMessage): TS3TextMessage {
+  return {
+    invokerName: msg.invokerName,
+    invokerId: String(msg.invokerID),
+    invokerUid: msg.invokerUID,
+    message: msg.message,
+    targetMode: msg.targetMode,
+    invokerGroups: msg.invokerGroups ?? [],
+  };
+}
+```
+
+Replace the inline mapping inside `this.client.on("textMessage", ...)` (currently lines 205-214) with a call to the mapper:
+
+```ts
+    this.client.on("textMessage", (msg: TextMessage) => {
+      this.emit("textMessage", toTS3TextMessage(msg));
+    });
+```
+
+(`TextMessage` is already imported at the top of the file.)
+
+- [ ] **Step 4: Run the test to verify it passes**
+
+Run: `npx vitest run "src/ts-protocol/text-message.test.ts"`
+Expected: PASS (3 tests).
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add "src/ts-protocol/client.ts" "src/ts-protocol/text-message.test.ts"
+git commit -m "feat(ts-protocol): surface invokerGroups on TS3TextMessage via pure mapper"
+```
+
+---
+
+### Task 3: Permission gate in `handleTextMessage` (fallback lookup + fail-closed + denial reply)
+
+**Files:**
+- Modify: `src/bot/instance.ts` (imports lines 10-14; add a module constant; `handleTextMessage` lines 317-349; add two private methods)
+- Test: `src/bot/instance.test.ts` (append a new `describe` block)
+
+**Interfaces:**
+- Consumes:
+  - `canRunCommand(commandName, invokerGroups, adminGroups)` from `./commands.js` (Task 1).
+  - `TS3TextMessage.invokerGroups: string[]` (Task 2).
+  - Existing `this.tsClient.getClientsInChannel(): Promise<ClientInfo[]>` where each `ClientInfo` has `id: number` and `serverGroups: string[]` (library already parses these).
+  - Existing `this.tsClient.sendTextMessage(message: string, targetMode?: number): Promise<void>`.
+- Produces:
+  - `export const COMMAND_DENIED_MESSAGE: string` (exported so the test can assert it).
+  - Private `isCommandAllowed(commandName, msg)` and `lookupInvokerGroups(invokerId)` (exercised via prototype in the test).
+
+- [ ] **Step 1: Write the failing tests**
+
+Append to `src/bot/instance.test.ts`:
+
+```ts
+import { vi } from "vitest";
+import { COMMAND_DENIED_MESSAGE } from "./instance.js";
+import type { TS3TextMessage } from "../ts-protocol/client.js";
+
+/** Minimal `this` carrying only what handleTextMessage's gate path touches.
+ *  The gate methods live on the prototype and are attached here so calls like
+ *  `this.isCommandAllowed(...)` resolve against this same object. */
+function makeGateCtx(opts: {
+  adminGroups?: number[];
+  clients?: Array<{ id: number; serverGroups: string[] }>;
+}) {
+  const ctx: any = {
+    config: { commandPrefix: "!", commandAliases: {}, adminGroups: opts.adminGroups ?? [] },
+    logger: { info: vi.fn(), error: vi.fn() },
+    tsClient: {
+      sendTextMessage: vi.fn(async () => {}),
+      getClientsInChannel: vi.fn(async () => opts.clients ?? []),
+    },
+    executeCommand: vi.fn(async () => null),
+    isCommandAllowed: (BotInstance.prototype as any).isCommandAllowed,
+    lookupInvokerGroups: (BotInstance.prototype as any).lookupInvokerGroups,
+  };
+  return ctx;
+}
+
+function makeMsg(message: string, invokerGroups: string[] = [], invokerId = "5"): TS3TextMessage {
+  return { invokerName: "Tester", invokerId, invokerUid: "uid", message, targetMode: 2, invokerGroups };
+}
+
+const handleTextMessage = (BotInstance.prototype as any).handleTextMessage as (
+  this: unknown,
+  msg: TS3TextMessage,
+) => Promise<void>;
+
+describe("BotInstance.handleTextMessage — command permission gate", () => {
+  it("runs a public command even with enforcement on", async () => {
+    const ctx = makeGateCtx({ adminGroups: [6] });
+    await handleTextMessage.call(ctx, makeMsg("!play 晴天"));
+    expect(ctx.executeCommand).toHaveBeenCalledTimes(1);
+    expect(ctx.tsClient.sendTextMessage).not.toHaveBeenCalledWith(COMMAND_DENIED_MESSAGE);
+  });
+
+  it("runs an admin command when enforcement is off (empty adminGroups)", async () => {
+    const ctx = makeGateCtx({ adminGroups: [] });
+    await handleTextMessage.call(ctx, makeMsg("!stop"));
+    expect(ctx.executeCommand).toHaveBeenCalledTimes(1);
+  });
+
+  it("runs an admin command when the event carried a matching group", async () => {
+    const ctx = makeGateCtx({ adminGroups: [6] });
+    await handleTextMessage.call(ctx, makeMsg("!stop", ["6"]));
+    expect(ctx.executeCommand).toHaveBeenCalledTimes(1);
+    expect(ctx.tsClient.getClientsInChannel).not.toHaveBeenCalled(); // no fallback needed
+  });
+
+  it("denies an admin command when known groups do not match (no fallback, with reply)", async () => {
+    const ctx = makeGateCtx({ adminGroups: [6] });
+    await handleTextMessage.call(ctx, makeMsg("!stop", ["8"]));
+    expect(ctx.executeCommand).not.toHaveBeenCalled();
+    expect(ctx.tsClient.getClientsInChannel).not.toHaveBeenCalled();
+    expect(ctx.tsClient.sendTextMessage).toHaveBeenCalledWith(COMMAND_DENIED_MESSAGE);
+  });
+
+  it("falls back to a group lookup when the event carried no groups, and allows on match", async () => {
+    const ctx = makeGateCtx({ adminGroups: [6], clients: [{ id: 5, serverGroups: ["6"] }] });
+    await handleTextMessage.call(ctx, makeMsg("!stop", [], "5"));
+    expect(ctx.tsClient.getClientsInChannel).toHaveBeenCalledTimes(1);
+    expect(ctx.executeCommand).toHaveBeenCalledTimes(1);
+  });
+
+  it("fails closed when the fallback finds the client but no matching group", async () => {
+    const ctx = makeGateCtx({ adminGroups: [6], clients: [{ id: 5, serverGroups: ["8"] }] });
+    await handleTextMessage.call(ctx, makeMsg("!stop", [], "5"));
+    expect(ctx.executeCommand).not.toHaveBeenCalled();
+    expect(ctx.tsClient.sendTextMessage).toHaveBeenCalledWith(COMMAND_DENIED_MESSAGE);
+  });
+
+  it("fails closed when the fallback cannot find the client at all", async () => {
+    const ctx = makeGateCtx({ adminGroups: [6], clients: [] });
+    await handleTextMessage.call(ctx, makeMsg("!stop", [], "5"));
+    expect(ctx.executeCommand).not.toHaveBeenCalled();
+    expect(ctx.tsClient.sendTextMessage).toHaveBeenCalledWith(COMMAND_DENIED_MESSAGE);
+  });
+});
+```
+
+- [ ] **Step 2: Run the tests to verify they fail**
+
+Run: `npx vitest run "src/bot/instance.test.ts"`
+Expected: FAIL — `COMMAND_DENIED_MESSAGE` is not exported; `isCommandAllowed`/`lookupInvokerGroups` are undefined.
+
+- [ ] **Step 3: Implement the gate**
+
+In `src/bot/instance.ts`, change the commands import (lines 10-14) from `isAdminCommand` to `canRunCommand`:
+
+```ts
+import {
+  parseCommand,
+  canRunCommand,
+  type ParsedCommand,
+} from "./commands.js";
+```
+
+Add a module-level constant just after the imports (above `export interface BotInstanceOptions`):
+
+```ts
+/** Reply sent when a non-admin invokes an admin-only chat command. */
+export const COMMAND_DENIED_MESSAGE = "⛔ 需要管理员权限（该命令仅限管理员服务器组）";
+```
+
+Replace `handleTextMessage` (lines 317-349) so the dead stub becomes the real gate:
+
+```ts
+  private async handleTextMessage(msg: TS3TextMessage): Promise<void> {
+    const parsed = parseCommand(
+      msg.message,
+      this.config.commandPrefix,
+      this.config.commandAliases
+    );
+    if (!parsed) return;
+
+    if (!(await this.isCommandAllowed(parsed.name, msg))) {
+      this.logger.info(
+        { command: parsed.name, invoker: msg.invokerName },
+        "Command denied: invoker not in adminGroups"
+      );
+      try {
+        await this.tsClient.sendTextMessage(COMMAND_DENIED_MESSAGE);
+      } catch (sendErr) {
+        this.logger.error({ err: sendErr }, "Failed to send permission-denied message to chat");
+      }
+      return;
+    }
+
+    this.logger.info(
+      { command: parsed.name, args: parsed.args, invoker: msg.invokerName },
+      "Command received"
+    );
+
+    try {
+      const response = await this.executeCommand(parsed, msg);
+      if (response) {
+        await this.tsClient.sendTextMessage(response);
+      }
+    } catch (err) {
+      this.logger.error({ err, command: parsed.name }, "Command execution error");
+      try {
+        await this.tsClient.sendTextMessage(
+          `Error: ${(err as Error).message}`
+        );
+      } catch (sendErr) {
+        this.logger.error({ err: sendErr }, "Failed to send error message to chat");
+      }
+    }
+  }
+
+  /**
+   * Decide whether a chat command may run for this sender. Reads adminGroups
+   * live from this.config (the router mutates the same object). Only performs
+   * the async group lookup when the synchronous decision is "deny because the
+   * event carried no groups" — i.e. an admin command, enforcement on, and
+   * empty invokerGroups. Fails closed if groups remain undeterminable.
+   */
+  private async isCommandAllowed(commandName: string, msg: TS3TextMessage): Promise<boolean> {
+    const adminGroups = this.config.adminGroups;
+    if (canRunCommand(commandName, msg.invokerGroups, adminGroups)) return true;
+    // Here: admin command, enforcement on, and the provided groups did not match.
+    // If the event actually carried groups, this is a genuine deny — no lookup.
+    if (msg.invokerGroups.length > 0) return false;
+    // Groups unknown (sender not in the view cache): one targeted lookup, then
+    // re-decide. canRunCommand([], …) is false ⇒ fail-closed when still unknown.
+    const groups = await this.lookupInvokerGroups(msg.invokerId);
+    return canRunCommand(commandName, groups, adminGroups);
+  }
+
+  /**
+   * Best-effort lookup of a sender's server groups by client id, via the
+   * channel client list (whose entries already carry parsed serverGroups).
+   * Returns [] when the client can't be found or the query fails (→ deny).
+   */
+  private async lookupInvokerGroups(invokerId: string): Promise<string[]> {
+    const clid = Number(invokerId);
+    if (!Number.isFinite(clid) || clid <= 0) return [];
+    try {
+      const clients = await this.tsClient.getClientsInChannel();
+      const match = clients.find((c) => c.id === clid);
+      return match?.serverGroups ?? [];
+    } catch {
+      return [];
+    }
+  }
+```
+
+- [ ] **Step 4: Run the gate tests to verify they pass**
+
+Run: `npx vitest run "src/bot/instance.test.ts"`
+Expected: PASS (existing `runExclusive` tests + the 7 new gate tests).
+
+- [ ] **Step 5: Confirm the live-config invariant**
+
+Confirm `BotInstance` reads `adminGroups` from the shared, mutable config — not a copy. The constructor stores `this.config = options.config` (line 91 region) and the router (`src/web/api/bot.ts`) mutates that same object; no propagation call is needed. Quick check:
+
+Run: `grep -n "this.config = options.config\|this.config.adminGroups" "src/bot/instance.ts"`
+Expected: shows the assignment and the gate read (proves the gate uses the live reference).
+
+- [ ] **Step 6: Commit**
+
+```bash
+git add "src/bot/instance.ts" "src/bot/instance.test.ts"
+git commit -m "feat(bot): gate admin chat commands on adminGroups with fallback + deny reply"
+```
+
+---
+
+### Task 4: Read/write `adminGroups` in the settings endpoints
+
+**Files:**
+- Modify: `src/web/api/bot.ts` (GET `/settings` lines 35-41; POST `/settings` lines 45-97)
+- Test: `src/web/api/bot.test.ts` (append `it` cases to the first `describe("bot router /settings", …)` block)
+
+**Interfaces:**
+- Consumes: existing `config.adminGroups: number[]` (already declared in `src/data/config.ts`, default `[]`).
+- Produces: `GET /api/bot/settings` returns `adminGroups: number[]`; `POST /api/bot/settings` accepts, validates, persists, and echoes `adminGroups`.
+
+- [ ] **Step 1: Write the failing tests**
+
+Append these `it` cases inside the existing first `describe("bot router /settings", …)` block in `src/web/api/bot.test.ts` (it already wires `app`, `config`, and an admin `cookie`):
+
+```ts
+  it("GET /settings includes adminGroups reflecting config", async () => {
+    config.adminGroups = [6, 8];
+    const res = await request(app).get("/api/bot/settings").set("Cookie", cookie);
+    expect(res.status).toBe(200);
+    expect(res.body.adminGroups).toEqual([6, 8]);
+  });
+
+  it("POST /settings persists a validated adminGroups and GET returns it", async () => {
+    const res = await request(app)
+      .post("/api/bot/settings")
+      .set("Cookie", cookie)
+      .send({ adminGroups: [6, 8] });
+    expect(res.status).toBe(200);
+    expect(res.body.adminGroups).toEqual([6, 8]);
+    expect(config.adminGroups).toEqual([6, 8]);
+    const followUp = await request(app).get("/api/bot/settings").set("Cookie", cookie);
+    expect(followUp.body.adminGroups).toEqual([6, 8]);
+  });
+
+  it("POST /settings filters invalid adminGroups entries (negative, non-integer, non-number)", async () => {
+    const res = await request(app)
+      .post("/api/bot/settings")
+      .set("Cookie", cookie)
+      .send({ adminGroups: [6, -1, 2.5, "x", 8] });
+    expect(res.status).toBe(200);
+    expect(config.adminGroups).toEqual([6, 8]);
+  });
+
+  it("POST /settings ignores a non-array adminGroups (leaves config unchanged)", async () => {
+    config.adminGroups = [6];
+    const res = await request(app)
+      .post("/api/bot/settings")
+      .set("Cookie", cookie)
+      .send({ adminGroups: "6" });
+    expect(res.status).toBe(200);
+    expect(config.adminGroups).toEqual([6]);
+  });
+```
+
+- [ ] **Step 2: Run the tests to verify they fail**
+
+Run: `npx vitest run "src/web/api/bot.test.ts"`
+Expected: FAIL — `res.body.adminGroups` is `undefined`; the POST does not persist `adminGroups`.
+
+- [ ] **Step 3: Extend the GET handler**
+
+In `src/web/api/bot.ts`, add `adminGroups` to the GET `/settings` response (the handler at lines 35-41):
+
+```ts
+  router.get("/settings", requireNotGuest, (_req, res) => {
+    res.json({
+      idleTimeoutMinutes: config.idleTimeoutMinutes ?? 0,
+      autoPauseOnEmpty: config.autoPauseOnEmpty,
+      adminGroups: config.adminGroups ?? [],
+      guestMode: config.guestMode,
+    });
+  });
+```
+
+- [ ] **Step 4: Extend the POST handler**
+
+In the POST `/settings` handler: (a) pull `adminGroups` out of `req.body`; (b) validate + assign before `saveConfig`; (c) echo it in the response. Change the destructuring line (46):
+
+```ts
+    const { idleTimeoutMinutes, autoPauseOnEmpty, guestMode, adminGroups } = req.body;
+```
+
+Add this block just before `saveConfig(configPath, config);` (line 77):
+
+```ts
+    if (Array.isArray(adminGroups)) {
+      config.adminGroups = adminGroups.filter(
+        (g: unknown): g is number =>
+          typeof g === "number" && Number.isInteger(g) && g >= 0,
+      );
+    }
+```
+
+Add `adminGroups` to BOTH `res.json({ … })` bodies in this handler (the success response near line 92, and — if present — keep them consistent):
+
+```ts
+    res.json({
+      idleTimeoutMinutes: config.idleTimeoutMinutes ?? 0,
+      autoPauseOnEmpty: config.autoPauseOnEmpty,
+      adminGroups: config.adminGroups ?? [],
+      guestMode: config.guestMode,
+    });
+```
+
+- [ ] **Step 5: Run the tests to verify they pass**
+
+Run: `npx vitest run "src/web/api/bot.test.ts"`
+Expected: PASS (existing settings/guest-mode tests + the 4 new adminGroups tests).
+
+- [ ] **Step 6: Commit**
+
+```bash
+git add "src/web/api/bot.ts" "src/web/api/bot.test.ts"
+git commit -m "feat(api): read/write adminGroups in bot settings endpoints"
+```
+
+---
+
+### Task 5: Admin-only "命令权限" section in Settings.vue
+
+**Files:**
+- Modify: `web/src/views/Settings.vue` (template: add a section after the Guest Mode section, before the Bot Profile section ~line 506; script: add state + handlers near the guest-mode block ~line 1093; hydrate in `loadIdleTimeout` ~line 1024)
+
+**Interfaces:**
+- Consumes: `GET /api/bot/settings` → `adminGroups: number[]`; `POST /api/bot/settings` with `{ adminGroups: number[] }` (Task 4). Existing `session.isAdmin.value`.
+- Produces: UI only.
+
+- [ ] **Step 1: Add the template section**
+
+In `web/src/views/Settings.vue`, insert this `<section>` immediately AFTER the closing `</section>` of the Guest Mode block (the one whose title is `游客模式`, ends ~line 505) and BEFORE the `<!-- Bot Profile … -->` section:
+
+```html
+    <!-- Command Permissions (admin only) -->
+    <section v-if="session.isAdmin.value" class="settings-section">
+      <h2 class="section-title">命令权限</h2>
+      <p class="profile-section-hint">
+        限制谁能在 TeamSpeak 聊天里运行管理类命令（stop / clear / remove / move / vol / mode）。
+        填写允许的服务器组 ID（逗号分隔）。留空 = 不限制，所有人可用。如何查看服务器组 ID 见 README。
+      </p>
+      <div class="setting-row">
+        <div class="prefix-input-wrap">
+          <input v-model="adminGroupsText" class="input input-sm" placeholder="如 6, 8" />
+          <button class="btn-primary" :disabled="adminGroupsSaving" @click="saveAdminGroups">
+            {{ adminGroupsSaving ? '保存中…' : '保存' }}
+          </button>
+        </div>
+      </div>
+    </section>
+```
+
+- [ ] **Step 2: Add the script state + handlers**
+
+In the `<script setup>` block, add this just after the guest-mode block (after `saveGuestMode` closes, ~line 1093):
+
+```ts
+// --- Command permissions (admin only) ---
+const adminGroupsText = ref('');
+const adminGroupsSaving = ref(false);
+
+function applyAdminGroupsFromServer(groups: unknown) {
+  if (Array.isArray(groups)) {
+    adminGroupsText.value = groups.filter((g) => typeof g === 'number').join(', ');
+  }
+}
+
+function parseAdminGroups(text: string): number[] {
+  return text
+    .split(',')
+    .map((s) => s.trim())
+    .filter((s) => s.length > 0)
+    .map((s) => Number(s))
+    .filter((n) => Number.isInteger(n) && n >= 0);
+}
+
+async function saveAdminGroups() {
+  adminGroupsSaving.value = true;
+  try {
+    const res = await axios.post('/api/bot/settings', { adminGroups: parseAdminGroups(adminGroupsText.value) });
+    applyAdminGroupsFromServer(res.data?.adminGroups);
+  } catch { /* ignore */ } finally {
+    adminGroupsSaving.value = false;
+  }
+}
+```
+
+- [ ] **Step 3: Hydrate on load**
+
+In `loadIdleTimeout` (the existing function ~lines 1024-1031), add the hydrate call alongside `applyGuestModeFromServer`:
+
+```ts
+async function loadIdleTimeout() {
+  try {
+    const res = await axios.get('/api/bot/settings');
+    idleTimeout.value = res.data.idleTimeoutMinutes ?? 0;
+    autoPauseOnEmpty.value = res.data.autoPauseOnEmpty ?? false;
+    applyGuestModeFromServer(res.data.guestMode);
+    applyAdminGroupsFromServer(res.data.adminGroups);
+  } catch { /* ignore */ }
+}
+```
+
+- [ ] **Step 4: Type-check the frontend**
+
+Run: `cd "web" && npx vue-tsc --noEmit`
+Expected: no errors.
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add "web/src/views/Settings.vue"
+git commit -m "feat(web): admin-only command-permission (adminGroups) settings section"
+```
+
+---
+
+### Task 6: Document the feature in the README
+
+**Files:**
+- Modify: `README.md`
+
+**Interfaces:**
+- Consumes: nothing (docs).
+- Produces: user-facing documentation of the feature + how to find TS server-group IDs.
+
+- [ ] **Step 1: Locate the insertion point**
+
+Run: `grep -n "游客模式\|Guest\|权限\|adminGroups" "README.md"`
+Expected: shows the guest-mode / permissions area. Insert the new subsection immediately after the guest-mode documentation block (or, if there is a dedicated permissions/features section, at its end).
+
+- [ ] **Step 2: Add the documentation block**
+
+Insert this markdown at the chosen point:
+
+```markdown
+### TeamSpeak 命令权限（管理类命令限制）
+
+默认情况下，频道里任何人都能运行所有聊天命令。你可以把一组「管理类」命令限制为只有特定 TeamSpeak 服务器组的成员才能运行：
+
+- 受限命令：`stop`、`clear`、`remove`、`move`、`vol`、`mode`
+- 其余命令（点歌、队列、跳过、歌词等）始终对所有人开放
+- **默认不限制**：管理服务器组列表为空时，所有命令对所有人开放（向后兼容）
+
+**配置方式**
+
+- 网页端：设置 → 命令权限，填写允许的服务器组 ID（逗号分隔），保存即时生效。
+- 或编辑 `config.json` 的 `adminGroups`（数字数组），例如 `"adminGroups": [6, 8]`。
+
+填入任意服务器组 ID 后，限制立即开启：只有属于这些组之一的用户才能运行受限命令，其他人会收到「⛔ 需要管理员权限」的提示。
+
+> 提示（fail-closed）：当受限命令来自一个机器人当前看不到其服务器组的发送者（例如不在机器人所在频道的私聊），机器人会尝试查询其分组；若仍无法确定，则拒绝执行。
+
+**如何查看服务器组 ID**
+
+在 TeamSpeak 客户端中打开「权限 → 服务器组」（Permissions → Server Groups）对话框，选中某个组后，其 ID 会显示在标题栏/状态栏；或在服务器组管理界面中查看每个组对应的数字 ID。把需要授权的组 ID 填入上面的设置即可。
+```
+
+- [ ] **Step 3: Sanity-check the docs render**
+
+Run: `grep -n "命令权限\|adminGroups" "README.md"`
+Expected: shows the newly added section.
+
+- [ ] **Step 4: Commit**
+
+```bash
+git add "README.md"
+git commit -m "docs: document TeamSpeak chat-command permission control"
+```
+
+---
+
+## Final verification (after all tasks)
+
+- [ ] Remove stale compiled output, then run the full suite:
+
+```bash
+rm -rf dist
+npm test
+```
+Expected: all tests pass (the new `canRunCommand`, `toTS3TextMessage`, gate, and `adminGroups` settings tests included).
+
+- [ ] Full build (backend `tsc` + frontend `vue-tsc` + vite):
+
+```bash
+npm run build
+```
+Expected: SUCCESS (no type errors).

docs/superpowers/plans/2026-07-03-spotify-stage4-polish-docs.md

@@ -0,0 +1,520 @@
+# Spotify Source — Stage 4 (Polish, Config UI, Docs) Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** Complete the Spotify source's last mile — make it user-configurable and user-authorizable from the web UI, document it (with the required safety warnings), and land the deferred OAuth-robustness hardening.
+
+**Architecture:** The Stage-3 OAuth endpoints (`/api/spotify/{login,callback,status}`) and the single shared `SpotifyOAuth` already exist but are unreachable from the UI. Stage 4 adds: (1) a `spotify` block to the `/api/bot/settings` config API (secret masked); (2) a resolved-backend indicator on `/status`; (3) OAuth refresh/verifier hardening; (4) the approved Settings "Connect Spotify" card (spec §8); (5) the README Spotify section (spec §11/§12). Deferred (documented, NOT built this stage): runtime binary auto-download, connect play-not-reflected diagnostics, extra watchdog.
+
+**Tech Stack:** TypeScript (ESM, `.js` specifiers), Express, Vitest (root config also runs `web/src/**/*.test.ts` — stores/composables only; there is NO `.vue` component-test harness), Vue 3 + `<script setup>` + Pinia, `vue-tsc` (web build gate).
+
+## Global Constraints
+
+- **Safe-by-default (spec §2/§7):** Spotify stays inert unless `enabled` AND authorized AND a resolvable binary. Nothing in this stage may change behavior when `spotify.enabled === false`.
+- **Never expose secrets (spec §2/§7):** `clientSecret` is the operator's own value. The config GET API MUST NOT return the raw `clientSecret` — return only a boolean `hasClientSecret`. POST overwrites `clientSecret` only when a non-empty string is supplied (blank/omitted = unchanged). No bundled credentials, no shared Developer app.
+- **Permissions:** config writes gated by `requirePermission("bot.manage")`; reads by `requireNotGuest`; the OAuth login card is additionally shown only to `can('platform.auth')` / admins — mirror the existing Settings gating.
+- **Validation mirrors `src/data/config.ts`:** `backend` ∈ `{"auto","go-librespot","librespot"}`; `bitrate` ∈ `{96,160,320}`; `deviceName` non-empty trimmed string (else keep prior); strings coerced/guarded. Reuse the exact value sets.
+- **Language:** README additions are in Chinese (repo is Chinese-only), matching existing heading style (`## 功能特性` etc.).
+- **Licensing (spec §9):** go-librespot is GPL-3.0 — the README must include its license note + a source offer; the bot ships NO binary (source-only Rust librespot; Linux-only go-librespot assets).
+- **Honesty:** live audio / Connect control / real OAuth round-trip remain NOT verifiable here (need Premium + real binaries + a real account). "Done" = unit-tested (mocked process/HTTP/FS), `tsc --noEmit` clean, `cd web && npm run build` clean, full suite green, reviewed. Never claim audio works.
+- **Branch:** all work on `feat/spotify-audio`. Do NOT create per-task branches.
+- **Full suite command:** `npx vitest run --no-file-parallelism` (avoids the users.test.ts bcrypt LOAD flake). Typecheck: `npx tsc --noEmit`. Web build: `cd web && npm run build`.
+
+---
+
+### Task 1: `/api/bot/settings` reads & writes the `spotify` block (secret masked)
+
+**Files:**
+- Modify: `src/web/api/bot.ts` (GET `/settings` response + POST `/settings` destructure/validate/echo)
+- Test: `src/web/api/bot.test.ts`
+
+**Interfaces:**
+- Consumes: `config.spotify: SpotifyConfig` (`{ enabled, backend, clientId, clientSecret, deviceName, bitrate }`), `saveConfig(configPath, config)`, `requirePermission("bot.manage")`, `requireNotGuest` — all already imported/used in this file.
+- Produces (new response shape on GET+POST, both add a `spotify` key):
+  ```ts
+  // masked view — NEVER includes clientSecret
+  spotify: {
+    enabled: boolean;
+    backend: "auto" | "go-librespot" | "librespot";
+    clientId: string;
+    deviceName: string;
+    bitrate: number;
+    hasClientSecret: boolean;   // whether a non-empty secret is stored
+  }
+  ```
+
+- [ ] **Step 1.1: Write failing tests.** Add to `src/web/api/bot.test.ts` (mirror the existing settings tests — reuse their app/harness + auth stubs). Cover:
+  1. GET `/api/bot/settings` includes a `spotify` object with `enabled/backend/clientId/deviceName/bitrate/hasClientSecret` and does NOT include a `clientSecret` key. With a stored secret, `hasClientSecret === true`; with `clientSecret: ""`, `false`.
+  2. POST `/api/bot/settings` with `{ spotify: { enabled: true, backend: "librespot", clientId: "cid", deviceName: "Dev", bitrate: 160 } }` updates all those fields and echoes the masked view; `saveConfig` called.
+  3. POST with `{ spotify: { backend: "bogus" } }` leaves `backend` unchanged (invalid rejected, not 400 for the whole request — partial-merge semantics like the other fields). Same for `bitrate: 999`.
+  4. POST with `{ spotify: { clientSecret: "newsecret" } }` sets the secret (assert via `hasClientSecret === true` in the echo AND that `config.spotify.clientSecret === "newsecret"`). POST with `{ spotify: { clientSecret: "" } }` does NOT overwrite an existing secret.
+  5. POST `/api/bot/settings` spotify write requires `bot.manage` (a member without it → 403; reuse the existing 403 test pattern).
+  6. An existing settings POST that omits `spotify` still works and does not touch `config.spotify` (no regression).
+
+- [ ] **Step 1.2: Run the tests — expect failure** (`npx vitest run src/web/api/bot.test.ts`): the `spotify` key is absent from responses.
+
+- [ ] **Step 1.3: Extend GET `/settings`.** Add the masked spotify view to the response object (both the GET at ~line 36 and the POST echo at ~line 103 — extract a local helper to avoid duplication):
+  ```ts
+  // near the top of createBotRouter, after other helpers:
+  const maskedSpotify = () => ({
+    enabled: config.spotify.enabled,
+    backend: config.spotify.backend,
+    clientId: config.spotify.clientId,
+    deviceName: config.spotify.deviceName,
+    bitrate: config.spotify.bitrate,
+    hasClientSecret: config.spotify.clientSecret.length > 0,
+  });
+  ```
+  Add `spotify: maskedSpotify(),` to BOTH the GET response and the POST echo object.
+
+- [ ] **Step 1.4: Handle `spotify` in POST `/settings`.** Add `spotify` to the destructure and a partial-merge block (mirror config.ts validation). Place before `saveConfig(...)`:
+  ```ts
+  const VALID_BACKENDS = ["auto", "go-librespot", "librespot"] as const;
+  const VALID_BITRATES = [96, 160, 320];
+  const sp = req.body?.spotify;
+  if (sp && typeof sp === "object") {
+    const t = config.spotify;
+    if (typeof sp.enabled === "boolean") t.enabled = sp.enabled;
+    if (typeof sp.backend === "string" && (VALID_BACKENDS as readonly string[]).includes(sp.backend)) {
+      t.backend = sp.backend as SpotifyConfig["backend"];
+    }
+    if (typeof sp.clientId === "string") t.clientId = sp.clientId;
+    // Secret is write-only + set-on-non-empty so a blank field never wipes it.
+    if (typeof sp.clientSecret === "string" && sp.clientSecret.length > 0) {
+      t.clientSecret = sp.clientSecret;
+    }
+    if (typeof sp.deviceName === "string" && sp.deviceName.trim().length > 0) {
+      t.deviceName = sp.deviceName.trim();
+    }
+    if (typeof sp.bitrate === "number" && VALID_BITRATES.includes(sp.bitrate)) {
+      t.bitrate = sp.bitrate;
+    }
+  }
+  ```
+  Add the type import if not present: `import type { SpotifyConfig } from "../../data/config.js";`.
+
+- [ ] **Step 1.5: Run tests — expect pass** (`npx vitest run src/web/api/bot.test.ts`). Then `npx tsc --noEmit` clean.
+
+- [ ] **Step 1.6: Commit.**
+  ```bash
+  git add src/web/api/bot.ts src/web/api/bot.test.ts
+  git commit -m "feat(spotify): expose spotify config on /api/bot/settings (secret masked) [S4.1]"
+  ```
+
+---
+
+### Task 2: `/api/spotify/status` reports the RESOLVED backend + binary availability (D11)
+
+**Files:**
+- Create: `src/music/spotify/backend-select.ts` (pure resolver) + `src/music/spotify/backend-select.test.ts`
+- Modify: `src/music/spotify/controller.ts` (delegate `chooseBackend` to the resolver)
+- Modify: `src/web/api/spotify.ts` (`/status` shape + `getBackendInfo` type)
+- Modify: `src/web/server.ts` (`getBackendInfo` computes the resolved kind)
+- Modify: `src/web/api/spotify.test.ts` (update the `/status` shape assertion)
+
+**Interfaces:**
+- Produces:
+  ```ts
+  // backend-select.ts
+  export type SpotifyBackendKind = "go-librespot" | "librespot";
+  export function resolveSpotifyBackendKind(
+    backend: "auto" | "go-librespot" | "librespot",
+    goPresent: boolean,
+    rustPresent: boolean,
+  ): SpotifyBackendKind | null;
+  // spotify.ts getBackendInfo now returns:
+  { backend: string; deviceName: string; binaryAvailable: boolean }
+  // /status response now:
+  { authorized: boolean; backend: string; deviceName: string; binaryAvailable: boolean }
+  ```
+- Note: `SpotifyBackendKind` currently lives in `controller.ts`. Move the canonical definition to `backend-select.ts` and re-export it from `controller.ts` (`export type { SpotifyBackendKind } from "./backend-select.js";`) so existing importers are unaffected.
+
+- [ ] **Step 2.1: Write failing resolver tests** `src/music/spotify/backend-select.test.ts` — the same 8-case matrix S3.5 used, but against the pure function:
+  ```ts
+  import { describe, it, expect } from "vitest";
+  import { resolveSpotifyBackendKind as pick } from "./backend-select.js";
+  describe("resolveSpotifyBackendKind", () => {
+    it("auto: go present -> go-librespot", () => expect(pick("auto", true, true)).toBe("go-librespot"));
+    it("auto: go absent, rust present -> librespot", () => expect(pick("auto", false, true)).toBe("librespot"));
+    it("auto: neither -> null", () => expect(pick("auto", false, false)).toBeNull());
+    it("go-librespot: present -> go-librespot", () => expect(pick("go-librespot", true, true)).toBe("go-librespot"));
+    it("go-librespot: absent -> null even if rust present", () => expect(pick("go-librespot", false, true)).toBeNull());
+    it("librespot: present -> librespot", () => expect(pick("librespot", true, true)).toBe("librespot"));
+    it("librespot: absent -> null even if go present", () => expect(pick("librespot", true, false)).toBeNull());
+    it("auto default fallthrough matches auto", () => expect(pick("auto", true, false)).toBe("go-librespot"));
+  });
+  ```
+
+- [ ] **Step 2.2: Run — expect failure** (module missing).
+
+- [ ] **Step 2.3: Create the resolver** `src/music/spotify/backend-select.ts`:
+  ```ts
+  /** Which concrete backend runs for a given config + host binary availability. */
+  export type SpotifyBackendKind = "go-librespot" | "librespot";
+
+  /**
+   * Pure backend selection shared by SpotifyController.chooseBackend() (per-bot)
+   * and the web /status endpoint (process-wide). Booleans in, no IO — the caller
+   * supplies platform+binary presence.
+   */
+  export function resolveSpotifyBackendKind(
+    backend: "auto" | "go-librespot" | "librespot",
+    goPresent: boolean,
+    rustPresent: boolean,
+  ): SpotifyBackendKind | null {
+    switch (backend) {
+      case "go-librespot":
+        return goPresent ? "go-librespot" : null;
+      case "librespot":
+        return rustPresent ? "librespot" : null;
+      case "auto":
+      default:
+        if (goPresent) return "go-librespot";
+        if (rustPresent) return "librespot";
+        return null;
+    }
+  }
+  ```
+
+- [ ] **Step 2.4: Run resolver tests — expect pass.**
+
+- [ ] **Step 2.5: Delegate from the controller.** In `controller.ts`, import the type+resolver **with a local binding** (a bare `export … from` re-export does NOT create a local name, and `SpotifyBackendKind` is still referenced locally at `chooseBackend()`'s return type and `buildBackend(kind: SpotifyBackendKind)` → would fail TS2304). Use:
+  ```ts
+  import { resolveSpotifyBackendKind, type SpotifyBackendKind } from "./backend-select.js";
+  export type { SpotifyBackendKind };   // keep the name exported for existing importers
+  // ...
+  chooseBackend(): SpotifyBackendKind | null {
+    return resolveSpotifyBackendKind(this.config.backend, this.goPresent(), this.rustPresent());
+  }
+  ```
+  Remove the old inline `switch` body and the standalone `export type SpotifyBackendKind = "go-librespot" | "librespot";` line. Keep `goPresent()/rustPresent()` as-is. Run `npx vitest run src/music/spotify/controller.test.ts` — the S3.5 matrix + auth-gate specs MUST still pass unchanged.
+
+- [ ] **Step 2.6: Update `/status`** in `src/web/api/spotify.ts` — extend the `getBackendInfo` type and the response:
+  ```ts
+  getBackendInfo: () => { backend: string; deviceName: string; binaryAvailable: boolean };
+  // ...
+  router.get("/status", requireNotGuest, (_req, res) => {
+    const info = opts.getBackendInfo();
+    res.json({
+      authorized: oauth.isAuthorized(),
+      backend: info.backend,
+      deviceName: info.deviceName,
+      binaryAvailable: info.binaryAvailable,
+    });
+  });
+  ```
+
+- [ ] **Step 2.7: Compute the resolved kind in `server.ts`.** Replace the `getBackendInfo` closure (currently returns raw `config.spotify.backend`) with a resolver call using live probes. Add imports `import { resolveSpotifyBackendKind } from "../music/spotify/backend-select.js";` and `import { isGoLibrespotSupported, findGoLibrespot, isRustLibrespotSupported, findLibrespot } from "../music/spotify/binary.js";` and `import { existsSync } from "node:fs";` (verify existsSync isn't already imported):
+  ```ts
+  getBackendInfo: () => {
+    const goPresent = isGoLibrespotSupported() && existsSync(findGoLibrespot());
+    const rustPresent = isRustLibrespotSupported() && existsSync(findLibrespot());
+    const resolved = resolveSpotifyBackendKind(options.config.spotify.backend, goPresent, rustPresent);
+    return {
+      backend: resolved ?? "none",
+      deviceName: options.config.spotify.deviceName,
+      binaryAvailable: resolved !== null,
+    };
+  },
+  ```
+
+- [ ] **Step 2.8: Update the `/status` test** in `src/web/api/spotify.test.ts` — the existing `toEqual({ authorized, backend, deviceName })` must become `toEqual({ authorized, backend, deviceName, binaryAvailable })`; extend the fake `getBackendInfo` in that test to return `binaryAvailable`. This is THIS task's contract change; update only the status test.
+
+- [ ] **Step 2.9: Verify.** `npx vitest run src/music/spotify/backend-select.test.ts src/music/spotify/controller.test.ts src/web/api/spotify.test.ts` all pass; `npx tsc --noEmit` clean.
+
+- [ ] **Step 2.10: Commit.**
+  ```bash
+  git add src/music/spotify/backend-select.ts src/music/spotify/backend-select.test.ts src/music/spotify/controller.ts src/web/api/spotify.ts src/web/server.ts src/web/api/spotify.test.ts
+  git commit -m "feat(spotify): report resolved backend + binaryAvailable on /status; share backend resolver [S4.2]"
+  ```
+
+---
+
+### Task 3: OAuth robustness — in-flight refresh cache + verifier TTL/cap (D9)
+
+**Files:**
+- Modify: `src/music/spotify/spotify-oauth.ts`
+- Test: `src/music/spotify/spotify-oauth.test.ts`
+
+**Interfaces:**
+- Consumes: existing `SpotifyOAuthOptions.deps?: { http?: AxiosInstance }`. Extend deps with an optional clock for testability: `deps?: { http?: AxiosInstance; now?: () => number }`.
+- Produces: no public API change. Internals: `refreshInFlight: Promise<string|null> | null`; `pendingVerifiers: Map<string, { verifier: string; expiresAt: number }>`.
+
+- [ ] **Step 3.1: Write failing tests.** Add to `src/music/spotify/spotify-oauth.test.ts`:
+  1. **Concurrent refresh collapses to one POST.** Build with a fake `http` whose `post("/api/token")` returns a promise you resolve manually (a `Deferred`) or counts calls, and a MUTABLE fake store (`save()` persists, `load()` returns the last saved value) seeded with an expired token. Fire two `getAccessToken()` calls before the POST resolves; assert `http.post` called exactly ONCE and both awaited results equal the new access token.
+  2. **In-flight clears after settle.** Using the same mutable store + a mutable `now` (`let t=…; now=()=>t`), after test 1 resolves, advance `t` past the newly-saved `expiresAt` and call `getAccessToken()` again → a NEW POST fires (count → 2). (Requires `toTokens` on `this.now()` per Step 3.3.)
+  3. **Verifier TTL.** With injected mutable `now`, `buildAuthorizeUrl()` at t=0 (capture its `state`), advance `now` to TTL+1, then `handleCallback(code, state)` → returns false (expired) and the entry is gone.
+  4. **Verifier cap.** Call `buildAuthorizeUrl()` `VERIFIER_MAX + 1` times (capturing the FIRST `state`); assert **behaviorally** that `handleCallback(code, <first state>)` now returns false (evicted as oldest). Prefer this behavioral assertion over inspecting the private `pendingVerifiers` map (no `as any` cast). Use the injected `now` for all timing.
+
+- [ ] **Step 3.2: Run — expect failure.**
+
+- [ ] **Step 3.3: Add the clock + in-flight refresh.** In the constructor: `this.now = o.deps?.now ?? (() => Date.now());` (add `private now: () => number;`). Rewrite `getAccessToken()` + add the in-flight field:
+  ```ts
+  private refreshInFlight: Promise<string | null> | null = null;
+
+  async getAccessToken(): Promise<string | null> {
+    if (!this.clientId) return null;
+    const tokens = this.store.load();
+    if (!tokens?.refreshToken) return null;
+    if (tokens.accessToken && this.now() < tokens.expiresAt) return tokens.accessToken;
+    // Collapse concurrent refreshes: rotation makes a second in-flight refresh
+    // use a refresh token the first one already invalidated.
+    if (this.refreshInFlight) return this.refreshInFlight;
+    this.refreshInFlight = this.refresh(tokens).finally(() => {
+      this.refreshInFlight = null;
+    });
+    return this.refreshInFlight;
+  }
+  ```
+  Replace the `Date.now()` in `getAccessToken` (spotify-oauth.ts:188) with `this.now()`. **Also change `toTokens` (spotify-oauth.ts:~221) to compute `expiresAt` from `this.now()` instead of `Date.now()`** — this is REQUIRED for testability: if `toTokens` kept real `Date.now()` while `getAccessToken` used an injected fixed clock, a freshly-refreshed token's `expiresAt` would sit far in the injected past/future and the "subsequent call → new POST" test would be non-deterministic. With both on `this.now()`, the test drives a mutable `now` (e.g. `let t = 0; const now = () => t;`) and advances it past the new `expiresAt` to force the second refresh.
+
+- [ ] **Step 3.4: Add verifier TTL + cap.** Change the map type and the two touch points:
+  ```ts
+  private pendingVerifiers = new Map<string, { verifier: string; expiresAt: number }>();
+  private static readonly VERIFIER_TTL_MS = 10 * 60 * 1000;
+  private static readonly VERIFIER_MAX = 32;
+
+  private evictStaleVerifiers(): void {
+    const t = this.now();
+    for (const [state, e] of this.pendingVerifiers) {
+      if (e.expiresAt < t) this.pendingVerifiers.delete(state);
+    }
+    // Bound memory even if all are unexpired: drop oldest (insertion order).
+    while (this.pendingVerifiers.size >= SpotifyOAuth.VERIFIER_MAX) {
+      const oldest = this.pendingVerifiers.keys().next().value;
+      if (oldest === undefined) break;
+      this.pendingVerifiers.delete(oldest);
+    }
+  }
+  ```
+  In `buildAuthorizeUrl()`: call `this.evictStaleVerifiers();` before the set, then `this.pendingVerifiers.set(state, { verifier, expiresAt: this.now() + SpotifyOAuth.VERIFIER_TTL_MS });`.
+  In `handleCallback()`: replace the `get`:
+  ```ts
+  const entry = this.pendingVerifiers.get(state);
+  if (!entry || entry.expiresAt < this.now()) {
+    this.pendingVerifiers.delete(state);
+    return false;
+  }
+  const verifier = entry.verifier;
+  ```
+  (Keep the existing `finally { this.pendingVerifiers.delete(state); }`.)
+
+- [ ] **Step 3.5: Run tests — expect pass.** Then `npx vitest run src/music/spotify/spotify-oauth.test.ts` (all, incl. prior S3.2 tests) + `npx tsc --noEmit` clean.
+
+- [ ] **Step 3.6: Commit.**
+  ```bash
+  git add src/music/spotify/spotify-oauth.ts src/music/spotify/spotify-oauth.test.ts
+  git commit -m "fix(spotify): collapse concurrent OAuth refresh + TTL/cap PKCE verifiers [S4.3]"
+  ```
+
+---
+
+### Task 4: Settings "Connect Spotify" card (spec §8)
+
+**Files:**
+- Create: `web/src/composables/useSpotifySettings.ts` (pure, testable logic) + `web/src/composables/useSpotifySettings.test.ts`
+- Modify: `web/src/views/Settings.vue` (add the card + wiring)
+
+**Interfaces (composable — the unit-tested surface):**
+```ts
+export interface SpotifyConfigForm {
+  enabled: boolean;
+  backend: "auto" | "go-librespot" | "librespot";
+  clientId: string;
+  clientSecret: string;   // blank means "unchanged"
+  deviceName: string;
+  bitrate: number;
+}
+export interface SpotifyStatus { authorized: boolean; backend: string; deviceName: string; binaryAvailable: boolean; }
+export const SPOTIFY_DISCLAIMER: string;                    // Chinese risk copy
+export function buildSpotifyPayload(f: SpotifyConfigForm): { spotify: Record<string, unknown> };  // omits clientSecret when blank
+export function parseSpotifyRedirect(search: string): "success" | "error" | null;  // from ?spotify=...
+export function statusSummary(s: SpotifyStatus | null, enabled: boolean): { label: string; tone: "ok" | "warn" | "off" };
+```
+
+- [ ] **Step 4.1: Write failing composable tests** `web/src/composables/useSpotifySettings.test.ts` (root vitest picks it up; import from `./useSpotifySettings.js` per the repo's ESM `.js` convention):
+  - `buildSpotifyPayload` includes `clientSecret` only when non-blank; always includes enabled/backend/clientId/deviceName/bitrate under a `spotify` key.
+  - `parseSpotifyRedirect("?spotify=success")==="success"`, `"?spotify=error"==="error"`, `"?x=1"===null`.
+  - `statusSummary(null, false)` → tone `"off"`; `statusSummary({authorized:false,binaryAvailable:false,...}, true)` → tone `"warn"`; `statusSummary({authorized:true,binaryAvailable:true,...}, true)` → tone `"ok"`.
+
+- [ ] **Step 4.2: Run — expect failure** (module missing).
+
+- [ ] **Step 4.3: Implement the composable** `web/src/composables/useSpotifySettings.ts`:
+  ```ts
+  export interface SpotifyConfigForm { enabled: boolean; backend: "auto" | "go-librespot" | "librespot"; clientId: string; clientSecret: string; deviceName: string; bitrate: number; }
+  export interface SpotifyStatus { authorized: boolean; backend: string; deviceName: string; binaryAvailable: boolean; }
+
+  // 实验性 · 灰色地带 · 需要 Premium · 使用你自己的开发者应用凭据
+  export const SPOTIFY_DISCLAIMER =
+    "实验性功能：通过 librespot 播放 Spotify 需要 Spotify Premium 账号，并使用你自己注册的 Spotify 开发者应用凭据。" +
+    "该方式处于 Spotify 服务条款的灰色地带，风险自负；默认关闭，不会内置任何共享凭据。";
+
+  export function buildSpotifyPayload(f: SpotifyConfigForm): { spotify: Record<string, unknown> } {
+    const spotify: Record<string, unknown> = {
+      enabled: f.enabled,
+      backend: f.backend,
+      clientId: f.clientId,
+      deviceName: f.deviceName,
+      bitrate: f.bitrate,
+    };
+    if (f.clientSecret && f.clientSecret.length > 0) spotify.clientSecret = f.clientSecret;
+    return { spotify };
+  }
+
+  export function parseSpotifyRedirect(search: string): "success" | "error" | null {
+    const v = new URLSearchParams(search).get("spotify");
+    return v === "success" || v === "error" ? v : null;
+  }
+
+  export function statusSummary(s: SpotifyStatus | null, enabled: boolean): { label: string; tone: "ok" | "warn" | "off" } {
+    if (!enabled) return { label: "已关闭", tone: "off" };
+    if (!s) return { label: "未知", tone: "warn" };
+    if (!s.binaryAvailable) return { label: "未检测到 librespot 可执行文件", tone: "warn" };
+    if (!s.authorized) return { label: "未授权（点击“连接 Spotify”登录）", tone: "warn" };
+    return { label: `已就绪 · 后端 ${s.backend}`, tone: "ok" };
+  }
+  ```
+
+- [ ] **Step 4.4: Run composable tests — expect pass.**
+
+- [ ] **Step 4.5: Add the card to `Settings.vue`.** Insert a new `.account-card`-style section in the settings surface, gated `v-if="can('platform.auth')"` (mirror the platform-login section). Follow the EXISTING patterns in this file:
+  - typed input + Save → mirror the idle-timeout input/saver (`Settings.vue` idle-timeout block + `saveIdleTimeout()` → `POST /api/bot/settings`);
+  - select group → mirror the quality button-group for `backend` and `bitrate`;
+  - toggle → mirror `localAudioEnabled` for `enabled`.
+  **Fields to render (all six):** the `enabled` toggle, `backend` group, `bitrate` group, a `clientId` text input, a `deviceName` text input, and a **Client Secret** field — a write-only password input (`type="password"`, `autocomplete="off"`), left BLANK on load with a "已设置 / 未设置" hint from `hasClientSecret`; a blank secret on Save means "unchanged" (never wipes). The Secret is §8-mandated — do not omit it.
+  Wiring (use `axios`, matching the file's other calls):
+  - **Load** on mount: `GET /api/bot/settings` → populate the form from `res.data.spotify` (leave `clientSecret` blank; show “已设置/未设置” from `hasClientSecret`); `GET /api/spotify/status` → status indicator via `statusSummary`.
+  - **Save**: `POST /api/bot/settings` with `buildSpotifyPayload(form)`; on success re-load status.
+  - **Connect**: `const { data } = await axios.get('/api/spotify/login'); window.location.href = data.url;` (guard errors → show message; a 403 means missing `platform.auth`).
+  - **Redirect handling**: on mount, `parseSpotifyRedirect(window.location.search)`; if `success`/`error`, show a toast/message and strip the param (e.g. `history.replaceState`). Reuse the file's existing notification/toast mechanism if present; otherwise a simple reactive message line.
+  - **Disclaimer**: render `SPOTIFY_DISCLAIMER` prominently in the card.
+  Keep the `<script setup>` logic thin — delegate payload/summary/redirect parsing to the composable (already tested). Do not add a `.vue` test (no harness).
+  - **Keep the two "spotify auth" concepts distinct:** the card's status comes ONLY from `/api/spotify/status` (playback OAuth `authorized`). Do NOT wire it to the player store's `authStatus.spotify`, which reflects `/api/auth/status?platform=spotify` (metadata Web-API `loggedIn`) — a different thing. Leave the player store untouched.
+  - **`vue-tsc` typing:** annotate the form as `reactive<SpotifyConfigForm>({...})` and the status as `ref<SpotifyStatus | null>(null)`; otherwise a button-group assignment (`form.backend = 'librespot'`) widens `backend` to `string` and the `null` init breaks the union passed into `buildSpotifyPayload`/`statusSummary` under `vue-tsc --noEmit`.
+  - **Hard order dependency:** `binaryAvailable` on `/api/spotify/status` exists only after Task 2 — execute this task AFTER Task 2.
+
+- [ ] **Step 4.6: Build gate.** `cd web && npm run build` → `vue-tsc --noEmit` clean + vite build succeeds. Then from root `npx vitest run web/src/composables/useSpotifySettings.test.ts` green.
+
+- [ ] **Step 4.7: Commit.**
+  ```bash
+  git add web/src/composables/useSpotifySettings.ts web/src/composables/useSpotifySettings.test.ts web/src/views/Settings.vue
+  git commit -m "feat(spotify): Connect-Spotify settings card (config + OAuth login + status) [S4.4]"
+  ```
+
+**Notes:** NOT e2e-verifiable (needs a real account/binary). Verified = composable unit tests + `vue-tsc` typecheck + build. The card only exposes config + a login trigger; it never displays the stored `clientSecret` (GET returns `hasClientSecret`, not the value).
+
+---
+
+### Task 5: README Spotify section (Chinese) — spec §9/§11/§12
+
+**Files:**
+- Modify: `README.md` (add a `## Spotify 音源（实验性）` section; add "Spotify" to the feature bullet if appropriate)
+
+**Content (required — write real prose, not placeholders):**
+- [ ] **Step 5.1:** Add a top-level section `## Spotify 音源（实验性）` covering, in Chinese:
+  1. **醒目警告框:** 实验性；需要 **Spotify Premium**；使用**你自己注册的 Spotify 开发者应用**（不内置任何共享凭据）；处于 Spotify 服务条款灰色地带，风险自负；**默认关闭**。
+  2. **工作原理（简述）:** 通过 librespot（Rust）/ go-librespot（Linux）作为独立进程解码 → PCM → ffmpeg 重采样到 48k → 走现有 Opus 发送管线。元数据来自 Spotify Web API。
+  3. **平台矩阵:** Windows → `librespot`(Rust)；Linux/Docker → `go-librespot`（可回退 `librespot`）；`auto` 自动选择（表格）。
+  4. **获取二进制:** Rust librespot 无预编译包 → `cargo install librespot` 或 scoop/choco，或将可执行文件放入项目 `bin/`（`bin/librespot.exe` / `bin/librespot`）。go-librespot 仅提供 Linux 资产（`github.com/devgianlu/go-librespot/releases`），放入 `bin/go-librespot` 或加入 PATH。
+  5. **注册开发者应用 + 回调:** 在 Spotify Developer Dashboard 建应用，取 Client ID，回调地址填 `http://127.0.0.1:<webPort>/api/spotify/callback`（与设置里的 Web 端口一致）；PKCE 不需要 Client Secret。
+  6. **启用步骤:** 设置页「连接 Spotify」卡片 → 填 Client ID、选后端、开启开关 → 保存 → 点「连接 Spotify」完成 OAuth 授权。
+  7. **许可与来源:** go-librespot 为 **GPL-3.0**，作为独立子进程调用（mere aggregation，不影响本项目许可）；附上其源码地址与许可说明（source offer）。
+  8. **故障排查:** 「未检测到 librespot」→ 检查 `bin/` 或 PATH；「未授权」→ 完成 OAuth；Windows 不支持 go-librespot（FIFO 仅限 POSIX）。
+- [ ] **Step 5.2:** Sanity-check the doc renders (headings consistent with existing `##` style; links valid). No code test.
+- [ ] **Step 5.3: Commit.**
+  ```bash
+  git add README.md
+  git commit -m "docs(spotify): README Spotify source section — setup, binaries, warnings, license [S4.5]"
+  ```
+
+---
+
+### Task 6: Rust Connect command retry/backoff (recovery/watchdog — spec §4.3/§13)
+
+**Rationale:** Spec §4.3 mandates "a watchdog + retry/backoff for device-visibility latency and command 202/404 flakiness"; §13 lists Rust Connect as the **top risk** (mitigation: retry/backoff + degrade-to-skipped). Stage 3 already landed the device-visibility watchdog (`waitForDevice()` bounded poll in `rust-librespot.ts`) and per-track device-absence → skip (`findDeviceByName`→null → `playTrack` false → BotInstance skips). The remaining, un-built piece is transient-failure retry/backoff on the Connect **mutating commands** — this task adds it while preserving C3.6 (never reject up the queue path; swallow on exhaustion).
+
+**Files:**
+- Modify: `src/music/spotify/connect-api.ts` (retry/backoff around the mutating PUTs; optional injected `sleep`/`logger`)
+- Modify: `src/music/spotify/controller.ts` (pass `this.logger` into the default `SpotifyConnectApi`)
+- Test: `src/music/spotify/connect-api.test.ts`
+
+**Interfaces:**
+- Consumes: existing `constructor(getToken: () => Promise<string|null>, deps?: { http?: AxiosInstance })`. **Extend deps** to `{ http?: AxiosInstance; sleep?: (ms: number) => Promise<void>; logger?: import("pino").Logger }` (all optional → source-compatible).
+- No public method signature change: `transfer/play/pause/resume/seek` stay `Promise<void>` and still swallow on final failure.
+
+- [ ] **Step 6.1: Write failing tests** in `src/music/spotify/connect-api.test.ts` (reuse the existing `getToken`/`http` injection pattern; inject a no-op `sleep: async () => {}` so no real timers run):
+  1. `play()` retries a transient 404 then succeeds: `http.put` rejects once with `{ response: { status: 404 } }` then resolves → assert `http.put` called TWICE, no throw.
+  2. `play()` exhausts on persistent 500: `http.put` always rejects `{ response: { status: 500 } }` → assert exactly `MAX_ATTEMPTS` calls, no throw (swallowed), and `logger.warn` called once (logger provided).
+  3. Non-transient (403) is NOT retried: reject `{ response: { status: 403 } }` → exactly ONE call, no throw.
+  4. `429` honors a **capped** `Retry-After`: reject once `{ response: { status: 429, headers: { "retry-after": "1" } } }` then resolve → `sleep` called with a bounded delay (≤ the cap) and 2 calls total.
+  5. `transfer()` uses the same retry path (one representative non-`play` mutator) — 404-then-success → 2 calls.
+
+- [ ] **Step 6.2: Confirm Red** (`npx vitest run src/music/spotify/connect-api.test.ts`).
+
+- [ ] **Step 6.3: Implement retry/backoff.** Add module constants + a private helper and route each mutating PUT through it:
+  ```ts
+  const TRANSIENT = new Set([404, 429, 500, 502, 503]);
+  const MAX_ATTEMPTS = 3;
+  const BASE_DELAY_MS = 150;
+  const MAX_DELAY_MS = 2_000;
+  // ...
+  private async mutateWithRetry(put: () => Promise<unknown>): Promise<void> {
+    for (let attempt = 1; attempt <= MAX_ATTEMPTS; attempt++) {
+      try {
+        await put();
+        return;
+      } catch (err: any) {
+        const status = err?.response?.status;
+        if (!TRANSIENT.has(status) || attempt === MAX_ATTEMPTS) {
+          // C3.6: never reject up the queue path — swallow, but surface once.
+          this.logger?.warn({ status }, "Spotify Connect command failed (exhausted/non-retryable)");
+          return;
+        }
+        let delay = Math.min(BASE_DELAY_MS * 2 ** (attempt - 1), MAX_DELAY_MS);
+        if (status === 429) {
+          const ra = Number(err?.response?.headers?.["retry-after"]);
+          if (Number.isFinite(ra) && ra > 0) delay = Math.min(ra * 1000, MAX_DELAY_MS);
+        }
+        await this.sleep(delay);
+      }
+    }
+  }
+  ```
+  In the constructor: `this.sleep = deps?.sleep ?? ((ms) => new Promise((r) => setTimeout(r, ms)));` and `this.logger = deps?.logger;`. Rewrite `transfer/play/pause/resume/seek` so their body becomes: guard `authHeaders()` as today (unauth → `return;`, no retry), then `await this.mutateWithRetry(() => this.http.put(<url>, <body>, { headers, ... }));`. Keep the exact URLs/bodies/params from the current methods.
+
+- [ ] **Step 6.4: Thread the logger from the controller.** In `controller.ts` where the default connect is built:
+  ```ts
+  this.connect = o.connect ?? new SpotifyConnectApi(() => this.oauth.getAccessToken(), { logger: this.logger });
+  ```
+  (`Logger` is already imported in controller.ts.) Injected-connect tests are unaffected.
+
+- [ ] **Step 6.5: Update any conflicting existing connect test.** The S3.3 (C3.6) tests assert mutating calls swallow errors. If any asserts a single `http.put` call on a *transient*-status rejection, it now expects `MAX_ATTEMPTS` — update ONLY that count (this task's contract change). Do NOT weaken the swallow/no-throw guarantees or the non-transient single-call behavior.
+
+- [ ] **Step 6.6: Verify.** `npx vitest run src/music/spotify/connect-api.test.ts src/music/spotify/controller.test.ts` all pass; `npx tsc --noEmit` clean.
+
+- [ ] **Step 6.7: Commit.**
+  ```bash
+  git add src/music/spotify/connect-api.ts src/music/spotify/connect-api.test.ts src/music/spotify/controller.ts
+  git commit -m "feat(spotify): retry/backoff on Connect commands (device-latency/flakiness watchdog) [S4.6]"
+  ```
+
+**Notes:** Bounded retry adds latency only on the (off-audio-path) control commands and only on transient failure; the injected `sleep` makes tests instant. Not e2e-verifiable (no real account). The `202`-accepted-but-not-effective case from §4.3 is NOT handled here (it needs post-command state verification, which the existing poll-based track-end already tolerates) — noted as a follow-up.
+
+---
+
+### Task 7: Stage 4 verification + whole-branch final review + finish
+
+**Files:** none (verification + review + branch finish).
+
+- [ ] **Step 7.1: Full verification.** `npx vitest run --no-file-parallelism` (all green), `npx tsc --noEmit` (clean), `cd web && npm run build` (clean). Record counts.
+- [ ] **Step 7.2: Whole-branch adversarial review.** Review the ENTIRE `feat/spotify-audio` branch (`git merge-base main HEAD`..HEAD) — Stages 2+3+4 — with a fan-out of finders across dimensions (lifecycle/teardown correctness, OAuth/token security + no-secret-leak, backend selection + gating, async races, error handling, test hygiene) and adversarial verification of each finding. Dispatch ONE fix subagent with the consolidated Critical/Important findings; roll up Minors.
+- [ ] **Step 7.3: Address findings**, re-verify, then use superpowers:finishing-a-development-branch to complete the branch (tests green → present options → execute choice).
+
+---
+
+## Self-Review (author)
+
+- **Spec coverage:** §8 Settings card → Task 4; §9 binaries/GPL note + §11 README → Task 5; §12 "docs, README" → Task 5; §12/§4.3/§13 "recovery/watchdog" (Connect retry/backoff) → Task 6 (device-visibility watchdog + per-track skip already landed in Stage 3); D9 → Task 3; D11 → Task 2; config editability (prereq for the card) → Task 1.
+- **Deferred (documented, NOT built this stage), with rationale:** runtime binary auto-download (spec §9 calls it "optional"; README documents manual install + Docker instead — avoids a tar.gz/checksum/platform-detection downloader on the critical path); the §4.3 `202`-accepted-but-not-effective verification (needs post-command playback-state confirmation the poll-based track-end already tolerates); D10's separate play-not-reflected diagnostic beyond the retry-exhaustion `logger.warn` Task 6 adds. These are listed in the ledger as follow-ups.
+- **Placeholder scan:** backend tasks (1–3) carry complete code; frontend/docs (4–5) carry the tested composable in full + explicit wiring contracts + named existing patterns to mirror (Settings.vue has no component-test harness, so exact `.vue` template text is intentionally pattern-referenced, not dictated line-by-line).
+- **Type consistency:** `SpotifyBackendKind` canonicalized in `backend-select.ts`, re-exported from `controller.ts`; `getBackendInfo` return type updated in both `spotify.ts` and its `server.ts` supplier and the `/status` test; `buildSpotifyPayload`/`SpotifyStatus` shapes match Task 1's masked view (`hasClientSecret`) and Task 2's `/status` (`binaryAvailable`).

docs/superpowers/plans/2026-07-06-jellyfin-source.md

@@ -0,0 +1,53 @@
+# Jellyfin 音源（主音源化）实施计划
+
+目标：自建 Jellyfin 服务器成为默认且主要的音源；现有 NetEase / QQ / Bilibili / YouTube / Kugou
+继续编译但默认停用（`enabledProviders` 配置门控，本次不删除）。约束：`src/audio/*`、
+`src/ts-protocol/*` 不改（唯一例外：`queue.ts` 中 `QueuedSong.platform` 联合类型加一个成员，
+纯类型加宽，无任何逻辑改动，否则无法编译）。
+
+## 触点地图
+
+后端：
+- `src/music/provider.ts` — platform 联合类型加 `"jellyfin"`（Song/Playlist/Album/MusicProvider）
+- `src/audio/queue.ts` — 同上（仅类型，一个词）
+- `src/data/database.ts` — PlayHistoryRecord.platform 加 `"jellyfin"`
+- `src/music/auth.ts` — CookieStore 平台加 `"jellyfin"`（token JSON 与 cookie 同路径持久化）
+- `src/data/config.ts` — 新增 `JellyfinConfig`（serverUrl / authMode / username / password /
+  apiKey / userId）+ `enabledProviders`（默认 `["jellyfin"]`）+ 载入清洗 + `isProviderEnabled` /
+  `defaultPlatform` 助手。spotify 仍由 `spotify.enabled` 门控、local 仍由 `localAudioEnabled` 门控
+- `src/music/jellyfin.ts` — 新 Provider：认证（userpass=AuthenticateByName + MediaBrowser 头，
+  401 重登一次；apikey=X-Emby-Token）、搜索（Audio/MusicAlbum/Playlist, StartIndex 翻页）、
+  懒解析播放 URL（direct=`/Audio/{id}/stream?static=true`；320/192/128=`/Audio/{id}/universal`
+  转码）、歌单/专辑/歌词（ticks→秒，404=无歌词）、收藏→InstantMix 电台链（收藏→最近播放→随机曲目）、
+  最近添加/最多播放/流派、播放上报（Sessions/Playing[/Progress|/Stopped]，全部吞错）、
+  音质档（direct 原始直传 / 320k / 192k / 128k）
+- `src/music/api-server.ts` — 按 provider 开关决定是否绑定 3001/3200
+- `src/index.ts` — 构造 JellyfinProvider、加载持久化 token、穿线
+- `src/bot/manager.ts` — 穿线 jellyfinProvider（与 spotifyProvider 同模式）
+- `src/bot/instance.ts` — jellyfin 分支（getProviderFor / getProvider，新 flag `-j`/`-n`）、
+  默认平台=jellyfin、停用音源友好报错、歌单/专辑命令识别 GUID、播放上报挂钩、帮助文本
+- `src/web/api/music.ts` — provider 选择 + 门控、`/providers`、jellyfin 首页数据端点、音质路由
+- `src/web/api/auth.ts` — jellyfin 状态 + 测试连接（/System/Info）；无 QR
+- `src/web/api/player.ts` — 平台白名单 + platformFlag（netease 显式 `-n`）
+- `src/web/api/bot.ts` — settings 读写 jellyfin 配置块（密码/APIKey 写入不回显）+ 热更新 provider
+
+前端（Vue 3，保持 YesPlayMusic 风格；新增文案 zh+en）：
+- `stores/player.ts` — Source 加 jellyfin、enabledProviders 状态、jellyfin 首页数据
+- `views/Search.vue` — 音源条只显示启用的 provider、Jellyfin 徽标
+- `views/Home.vue` — 最近添加 / 播放最多 / 我的歌单 / 收藏 / 流派 区块 + jellyfin FM 卡片
+- `views/Settings.vue` — Jellyfin 连接卡（地址/认证模式/凭据/测试连接）、隐藏停用 provider 的
+  登录卡、jellyfin 音质档
+- `views/Setup.vue` — 向导第 3 步换成 Jellyfin 连接卡
+- `views/Playlist.vue` 等 — ID 均按 string 处理，审计通过（GUID 无数字假设）
+
+文档：README 增加「Jellyfin 音源」章节 + fork 出处与 MIT 归属（上游
+ZHANGTIANYAO1/teamspeak-music-bot）。
+
+## 阶段与验证
+
+1. 类型 + 配置 → `npx tsc --noEmit`
+2. JellyfinProvider + 单测 → tsc + vitest
+3. 门控 + bot 穿线 → tsc + vitest
+4. REST → tsc + vitest
+5. WebUI → `cd web && npm run build`
+6. README + 全量构建/测试

docs/superpowers/specs/2026-05-30-autopause-empty-channel-design.md

@@ -0,0 +1,138 @@
+# Auto-pause on empty channel — design
+
+**Issue:** [#79](https://github.com/ZHANGTIANYAO1/teamspeak-music-bot/issues/79) item 3
+**Date:** 2026-05-30
+**Status:** Approved (brainstorm), pending implementation plan
+
+## Problem
+
+When everyone leaves the bot's voice channel, music keeps playing to an empty room.
+The maintainer wants an option to **auto-pause when the channel is empty** (no disconnect)
+and resume when someone returns.
+
+## Decisions (from brainstorm)
+
+- **Global toggle**, reusing the **already-declared but currently dead** `config.autoPauseOnEmpty`
+  (`src/data/config.ts`, default `true`). No per-bot granularity (YAGNI).
+- **Event-driven, near-instant** reaction (not the 30s poll alone) — subscribe to TS client
+  enter/leave/move events; keep the existing 30s idle poll as a fallback.
+- **Auto-resume only what we auto-paused** — a user-paused track is never auto-resumed.
+- Independent of the existing **idle-disconnect** (`idleTimeoutMinutes`): both share the same
+  emptiness signal but act independently (pause immediately; disconnect after N minutes).
+
+## Current state (verified)
+
+- `client.ts` `getClientsInChannel()` returns all clients in the bot's channel *including the
+  bot*; callers compute "others" as `length - 1`. No persistent roster.
+- The library emits `clientEnter` / `clientLeave` / `clientMoved`; `client.ts` currently only
+  *logs* `clientEnter` and does not re-emit leave/moved.
+- The idle poller in `instance.ts` (`_startIdlePoller`, every 30s) already computes
+  `userCount = getClientsInChannel().length - 1` and, when `<= 0`, schedules an
+  idle-disconnect after `idleTimeoutMinutes`.
+- `player.pause()` / `player.resume()` already pause/resume **without disconnecting** (ffmpeg
+  stays alive, no voice sent). The player only knows `idle|playing|paused` — there is **no**
+  auto-vs-user-pause distinction today.
+- `BotConfig.autoPauseOnEmpty` exists (default true) but is **read nowhere**.
+
+## Design
+
+### Occupancy signal (shared)
+Extract the idle poller's count into one method on `BotInstance`:
+`checkChannelOccupancy()` → queries `getClientsInChannel()`, computes `userCount = length - 1`,
+and drives **both** the existing idle-disconnect timer (unchanged behavior) **and** the new
+auto-pause logic below. It is called by:
+1. the existing 30s poll (fallback), and
+2. new TS event handlers.
+
+### Event subscription
+`client.ts`: subscribe to and **re-emit** `clientEnter`, `clientLeave`, `clientMoved` up to
+`BotInstance`. `BotInstance.setupTsEvents()` calls `checkChannelOccupancy()` on each (a re-query
+is simplest, since `clientLeave` carries no channel id). This gives near-instant pause/resume;
+the poll remains as a safety net.
+
+### Auto-pause logic (inside `checkChannelOccupancy`)
+Add a private `autoPaused = false` flag to `BotInstance`.
+- **Empty** (`userCount <= 0`): if `config.autoPauseOnEmpty` **and** `player.getState() === "playing"`
+  → `player.pause()`, `autoPaused = true`, emit `stateChange`. (Idle-disconnect timer still
+  scheduled as today.)
+- **Re-populated** (`userCount > 0`): if `autoPaused` **and** `player.getState() === "paused"`
+  → `player.resume()`, `autoPaused = false`, emit `stateChange`. (Idle timer cancelled as today.)
+
+### `autoPaused` bookkeeping (so user pauses are respected)
+Clear `autoPaused = false` in `cmdPause`, `cmdResume`, `cmdStop`, `cmdPlay`, and on
+connect/disconnect (the `disconnected` handler calls `player.stop()` → idle). Net effect: only a
+track *we* auto-paused gets auto-resumed; a user-paused track stays paused when someone returns.
+
+### Config wiring
+- `GET /api/bot/settings`: include `autoPauseOnEmpty` in the payload (alongside `idleTimeoutMinutes`).
+- `POST /api/bot/settings`: accept + validate a boolean `autoPauseOnEmpty`, `saveConfig`, and
+  propagate to live bots via a new `BotInstance.updateAutoPause(enabled)` (mirrors
+  `updateIdleTimeout`). Since the instance reads `this.config.autoPauseOnEmpty` live, propagation
+  can be as simple as updating the stored config reference / a field the check reads.
+- Frontend `Settings.vue` → the **行为设置** section (already `bot.manage`-gated): add a toggle
+  for `autoPauseOnEmpty` next to the idle-timeout control; load it in the settings fetch and send
+  it on save.
+
+## Components / files
+
+- `src/ts-protocol/client.ts` — subscribe + re-emit `clientEnter`/`clientLeave`/`clientMoved`.
+- `src/bot/instance.ts` — `autoPaused` field; `checkChannelOccupancy()` (refactored from the
+  idle poller, drives idle + auto-pause); event handlers; clear `autoPaused` in user commands +
+  connect/disconnect; `updateAutoPause(enabled)`.
+- `src/web/api/bot.ts` — `GET`/`POST /settings` handle `autoPauseOnEmpty`.
+- `web/src/views/Settings.vue` (+ player store settings load/save) — the toggle.
+- `src/data/config.ts` — field already exists (no change beyond confirming default).
+
+## Testing
+
+- **Decision unit test (TDD):** extract the pause/resume decision into a testable method, e.g.
+  `applyOccupancy(userCount)` operating on an injected fake player (`getState`/`pause`/`resume`)
+  + the `autoPaused` flag + the config flag. Cases: empty+playing+enabled → pause + `autoPaused`;
+  re-populated+`autoPaused`+paused → resume + clear; re-populated when NOT `autoPaused` (user
+  pause) → no resume; flag disabled → no pause; empty while idle (not playing) → no-op.
+- **API test:** `GET`/`POST /api/bot/settings` round-trips `autoPauseOnEmpty` (validates boolean,
+  persists, propagates).
+- Live TS event wiring is verified by code review + a manual run (can't unit-test a real server).
+
+## Non-goals
+
+- No per-bot toggle (global only). No change to idle-disconnect behavior. No new dependency.
+- Reaction relies on events the bot can already see (same-channel members are always in view);
+  no extra channel subscription needed.
+
+---
+
+## Update (2026-06): occupancy is event-driven & server-wide, not channel-filtered
+
+Live testing against a real TS3 server (with `@honeybbq/teamspeak-client` 0.2.2)
+invalidated two assumptions above. Recording the corrected model here so nobody
+reintroduces the old design:
+
+- **Default is OFF**, not on. See `getDefaultConfig()` in `src/data/config.ts`
+  and the rationale comment there.
+- **Query commands are unusable when others are present.** `clientlist`,
+  `channellist`, and `channelclientlist` ALL time out (~5–10s) whenever ≥2
+  clients are connected to the **server** (verified even when the two clients
+  are in *different* channels). They succeed only when the bot is the sole
+  client on the whole server. So `getClientsInChannel()` returns `[]` exactly
+  when occupancy matters, and `occupancyFromClientList(0)` returns `null`
+  ("unknown") so callers skip the decision rather than mis-reading it as empty.
+- **PAUSE** therefore only ever fires when the bot becomes alone on the server
+  (the one state where the query works). This is reliable and stays on the
+  query path (`refreshOccupancy()` + the 30s idle poller).
+- **RESUME** is armed directly from the `clientEnter` push event
+  (`shouldResumeOnReturn()` + `_resumeIfReturning()` in `instance.ts`), NOT from
+  a query. Because the bot only auto-pauses while alone, the sole way occupancy
+  can return while `autoPaused` is set is a fresh connection — delivered as
+  `clientEnter`. The resume branch never pauses (userCount is always > 0).
+- **Net semantics:** "pause when the server is empty (bot alone), resume when
+  someone connects." Channel granularity is **impossible** with this library:
+  `clientEnter`'s channel field is always `0` (library reads notify param `cid`
+  but enter-view carries `ctid`), and `clientMoved` delivery is flaky. Do NOT
+  attempt to layer `clientMoved.targetChannelID` channel-accuracy on top — it is
+  systematically wrong for direct-connect clients and reintroduces unreliability.
+  The correct path to true channel scoping is an upstream library fix.
+- **Knock-on:** idle-disconnect shares the same signal and is likewise
+  server-wide. UI copy in `web/src/views/Settings.vue` was updated to say
+  "服务器" rather than "频道" to match. `cmdVote` was intentionally left on the
+  query path (out of scope; switching it would inherit the same timeout).

docs/superpowers/specs/2026-05-30-dedicated-link-scope-design.md

@@ -0,0 +1,65 @@
+# Dedicated-link bot scoping (+ refresh fix) — design
+
+**Issue:** [#79](https://github.com/ZHANGTIANYAO1/teamspeak-music-bot/issues/79) items 2 and 4
+**Date:** 2026-05-30
+**Status:** Approved (brainstorm), pending implementation plan
+
+## Problem
+
+- **Item 2:** A dedicated link (`/bot/:id`) is meant to give someone control of *one* bot, but today it just sets the active bot and bounces to `/`; the user can still switch to any other bot from the top-right selector.
+- **Item 4 (bug):** After opening a dedicated link, refreshing the page loses the bot — the UI falls back to the first bot.
+
+Root cause (verified): `BotRedirect.vue` does `router.replace('/')` (dropping the id), and `activeBotId` is in-memory-only Pinia state with no persistence, so a reload resets it to `bots[0]`.
+
+## Decision (from brainstorm: Q2 = URL-carried scope)
+
+Carry the scoped bot in the **URL query** (`?bot=<id>`). One mechanism fixes **both** items: the URL is durable across refresh (item 4) and shareable/self-clearing, and the frontend locks the selector to the scoped bot (item 2). No localStorage sticky-lock; plain `/` (no `?bot`) = full control. Backend per-bot authorization (PR #80) remains the real boundary — this is a UX lock.
+
+## Design
+
+### Scope state (store)
+Add to the player store:
+- `scopedBotId: string | null` — the bot the UI is locked to.
+- getter `isScoped` = `scopedBotId !== null`.
+- action `setScope(id)` / `clearScope()`.
+- `setActiveBotId(id)` becomes a no-op (or ignores) when `isScoped` and `id !== scopedBotId`, so stray switch attempts can't change bots.
+
+### URL as the durable source of truth
+- `BotRedirect.vue` (`/bot/:id`): instead of `router.replace('/')`, validate the bot exists, then `router.replace({ path: '/', query: { bot: id } })`. (Keeps the "clean" home URL but with `?bot=`.)
+- **Router `beforeEach` guard** (the heart of it):
+  - If `to.query.bot` is present → `store.setScope(to.query.bot)` and continue.
+  - Else if `store.isScoped` (a scope is active and this navigation dropped the param) → redirect to the same route **with** `query.bot = store.scopedBotId` re-attached (so the lock survives in-app navigation to /search, /library, etc.).
+  - Else → no scope; continue.
+  This keeps `?bot=` on the URL for every route while scoped, so a refresh on *any* route re-establishes the lock → **fixes item 4**.
+- On app load / after `fetchBots()`: apply `scopedBotId`/`?bot` to `activeBotId`; if the scoped bot doesn't exist or isn't in the user's allowed set, **clear the scope gracefully** (fall back to normal multi-bot view) rather than locking onto a dead id.
+
+### Exit
+- `clearScope()` sets `scopedBotId = null`; the exit affordance navigates to `/` *after* clearing, so the guard won't re-attach `?bot`. This is the only way to leave scoped mode (self-clearing, intentional).
+
+### Navbar (the lock UI)
+- When `isScoped`: the bot selector shows **only** the scoped bot, the dropdown/switching is disabled (no chevron / non-interactive), and other bots' "copy link" affordances are not shown.
+- Show a small "专属模式" indicator with an "退出" control → `clearScope()` + navigate to `/`.
+- When not scoped: unchanged (full selector over `controllableBots`).
+
+### Active-bot coherence
+Because every player action already routes through `activeBotId`, locking `activeBotId === scopedBotId` guarantees all controls affect only the scoped bot. The store's `activeBot` getter `bots[0]` fallback still degrades safely if the scoped id ever fails to match (combined with the graceful-clear above).
+
+## Components / files
+
+- `web/src/stores/player.ts` — `scopedBotId` state, `isScoped`, `setScope`/`clearScope`, guard in `setActiveBotId`, apply scope→active in `fetchBots`/init (graceful clear if missing).
+- `web/src/router/index.ts` — `beforeEach` scope sync + `?bot` preservation.
+- `web/src/views/BotRedirect.vue` — set scope + `replace({ path: '/', query: { bot: id } })`.
+- `web/src/components/Navbar.vue` — locked selector + "专属模式/退出" affordance.
+- `web/src/App.vue` — ensure scope is applied to `activeBotId` after `fetchBots` on load (if not already handled by the store/guard).
+
+## Testing
+
+Vue UI isn't unit-tested in this repo, so verification is `vue-tsc` + manual run. The **store scope logic is testable** if a lightweight test harness exists for Pinia stores; otherwise assert the pure pieces:
+- `setActiveBotId` ignores a switch to a non-scoped bot while scoped; allows the scoped bot.
+- `clearScope` resets state.
+- A small helper for "resolve scope from query + bots list → {scopedBotId, activeBotId} or cleared-if-missing" can be extracted and unit-tested.
+Manual: open `/bot/<id>` → locked to that bot, selector shows only it; refresh → still locked (item 4 fixed); navigate to Search then refresh → still locked; click 退出 → back to all bots; open `/` directly → full control (no lock).
+
+## Non-goals
+
+- No localStorage persistence (URL is the source of truth). No backend change (per-bot auth already exists in #80). No change to how dedicated links are generated (still `<base>/bot/<id>`); only what happens when one is opened.

docs/superpowers/specs/2026-06-24-guest-mode-design.md

@@ -0,0 +1,317 @@
+# Guest mode (login-less WebUI access) — design
+
+**Issue:** [#83](https://github.com/ZHANGTIANYAO1/teamspeak-music-bot/issues/83) — "请求增加 WebUI 鉴权 guest 登录功能"
+**Date:** 2026-06-24
+**Status:** Approved (brainstorm), pending implementation plan
+
+## Scope
+
+Add an optional, **default-OFF** guest mode. When an admin enables it, anyone who can
+reach the WebUI can enter **without logging in** ("以游客身份进入 / Continue as guest")
+and use a restricted subset of playback/queue features. The admin chooses, per
+deployment, exactly what guests may do (a set of toggles) and which bot(s) guests may
+control. Guests can **never** view or change settings, manage bots, set platform
+credentials, change audio quality, or see the user/audit admin panels.
+
+This builds directly on the existing `admin | member` role + capability system
+(`src/data/permissions.ts`, `requirePermission`, `useSession().can()`) and the existing
+append-vs-play-next queue split (`PlayQueue.add` vs `addNext`). It does **not** rebuild
+auth.
+
+The original issue asked specifically that guest song requests go to "下一首" only.
+That exact behavior is reproducible in this design by the admin turning the
+"add to end" toggle **off** and the "play next" toggle **on** — it is one configuration
+of a more general per-ability toggle model (chosen in brainstorm).
+
+## Problem
+
+Today every `/api/*` route past the session router requires a real account
+(`requireAuth`). There is no anonymous/guest path: to let a friend queue a song, an
+admin must create them a `member` account. The maintainer wants a low-friction,
+admin-gated way to let untrusted visitors request music without an account, while
+keeping all administration locked down.
+
+## Decisions (from brainstorm)
+
+1. **Guest = no-login.** A guest is an **anonymous, config-driven synthetic principal**
+   (`role: "guest"`), not a database user with a password. No favorites, no
+   change-password, short-lived session.
+2. **Default OFF**, enforced **server-side** (the guest-session endpoint rejects when
+   the flag is off — never rely on hiding the button).
+3. **Per-ability toggles**, not a single "mode". Every song action and control action is
+   its own admin switch. Default state when guest mode is first enabled: only
+   "add to end of queue" is ON; everything else OFF.
+4. **Per-bot guest scope** (`"all"` or an explicit bot list), mirroring the existing
+   member bot allow-list. Guests cannot see or control out-of-scope bots — including
+   over WebSocket.
+5. **Settings are always hidden AND server-blocked for guests** (view + change), closing
+   the two currently-ungated reads (`GET /api/bot/settings`, `GET /api/music/quality`).
+6. **"Play now" for guests is non-destructive**: insert-next + skip to it, **never** the
+   existing clear-the-whole-queue `/play-song` behavior.
+7. **One unified authorization gate** encapsulates admin/member/guest logic so the
+   existing member/admin capability system is left behavior-unchanged.
+
+## Guest ability model
+
+### Always allowed (baseline read-only — the point of the feature)
+- Browse/search library, playlists, history, song detail, lyrics, cover art.
+- See now-playing and the live queue (REST + WebSocket), **scoped to allowed bots**.
+
+### Always denied (hard locks — not toggles)
+- View **or** change any settings (idle timeout, auto-pause, theme persistence server-side, command prefix, etc.).
+- Bot management (create/edit/delete/start/stop, bot config, avatar, profile).
+- Music-platform login (`/api/auth/*`), audio quality (`/api/music/quality`).
+- User management (`/api/users`), audit log (`/api/audit`), change-password.
+
+### Admin-configurable toggles (`guestMode.permissions.*`, all default `false` except `addToQueue`)
+
+| Flag | 中文 | Default | Backend route(s) gated |
+|---|---|---|---|
+| `addToQueue` | 添加到队列末尾 | **true** | `POST /:botId/add`, `/add-song`, `/add-by-id` |
+| `playNext` | 添加到下一首 | false | `POST /:botId/play-next-song` |
+| `playNow` | 立即播放（不清空队列） | false | new guest-safe play-now (insert-next + skip) |
+| `skip` | 跳过当前歌曲 | false | `POST /:botId/next` |
+| `transport` | 暂停/继续/进度/音量 | false | `POST /:botId/pause`, `/resume`, `/seek`, `/volume` |
+| `removeClear` | 移除/清空队列 | false | `DELETE /:botId/queue/:index`, `POST /:botId/clear` |
+| `playMode` | 切换播放模式 / FM | false | `POST /:botId/mode`, `/fm` |
+
+Notes:
+- Routes with **no** guest flag (e.g. `/prev`, `/stop`, `/play-song`, `/play-playlist`,
+  `/play-album`, `/play-at`, all of `/api/bot/*`, `/api/auth/*`, settings, users, audit)
+  are **never** reachable by guests — the gate denies any guest without an explicit flag.
+  This is the safe default: new routes are guest-denied unless deliberately opted in.
+- `/play-song`, `/play-playlist`, `/play-album` call `queue.clear()` and must stay
+  guest-denied regardless of toggles (they would wipe everyone's queue).
+
+## Config schema (`src/data/config.ts`)
+
+```ts
+export interface GuestPermissions {
+  addToQueue: boolean;   // append to end
+  playNext: boolean;     // 下一首 (insert after current)
+  playNow: boolean;      // 立即播放: insert-next + skip-to-it (non-destructive)
+  skip: boolean;         // skip current track
+  transport: boolean;    // pause/resume/seek/volume
+  removeClear: boolean;  // remove a queue item / clear the queue
+  playMode: boolean;     // play mode (shuffle/repeat) + FM
+}
+
+export interface GuestModeConfig {
+  enabled: boolean;          // master switch, default false
+  bots: "all" | string[];    // per-bot scope (botIds); default "all"
+  permissions: GuestPermissions;
+}
+
+// added to BotConfig:
+guestMode: GuestModeConfig;
+```
+
+`getDefaultConfig()` returns:
+```ts
+guestMode: {
+  enabled: false,
+  bots: "all",
+  permissions: {
+    addToQueue: true, playNext: false, playNow: false,
+    skip: false, transport: false, removeClear: false, playMode: false,
+  },
+}
+```
+
+**Merge hardening:** `loadConfig` currently does a shallow `{...defaults, ...partial}`,
+which would drop `guestMode` sub-keys if a saved config only contains a partial
+`guestMode`. `loadConfig` must **deep-merge `guestMode`** (and its `permissions`) over
+the defaults so missing sub-keys are back-filled. Covered by a `config.test.ts` case.
+
+**Bot deletion:** when a bot is removed, prune its id from `guestMode.bots` (if it's an
+array) and persist — mirrors `PermissionStore.pruneBot(botId)` for members. Done in the
+same `BotManager.removeBot` path that already prunes member access.
+
+## Backend design
+
+### Synthetic guest principal & session entry
+- **Role union widened** to `"admin" | "member" | "guest"` (`UserRole` in
+  `src/data/users.ts`, the `req.user` augmentation in `requireAuth.ts`, the frontend
+  `User` type, and the role badge in Navbar).
+- **Reserved guest user row.** A single fixed row (e.g. id `"__guest__"`, role `"guest"`,
+  an unusable password hash, username e.g. `"guest"`) is created idempotently by
+  migration. It exists only to satisfy the `sessions.userId` FK and the
+  `validateAndTouch` JOIN; it is excluded from user-management listings and the
+  last-admin guards (those count `role = 'admin'` only, so guests don't interfere).
+- **Guest login endpoint:** `POST /api/session/guest`, mounted in the **public** block
+  (before `csrfOriginCheck`/`requireAuth`, like `/login` and `/setup`), rate-limited.
+  - If `config.guestMode.enabled` is false → `403 guest mode disabled`.
+  - Else `sessions.createSession("__guest__")` and set the same `tsmb_session` httpOnly
+    cookie. **Guest sessions use a short TTL** (e.g. `GUEST_SESSION_TTL_MS`, ~24h) and
+    **bypass `MAX_SESSIONS_PER_USER`** for the guest principal (otherwise guest #11
+    would evict guest #1). Expired guest sessions are already deleted on validation; an
+    optional periodic sweep can prune stale ones.
+- **Disable = logout.** In `createRequireAuth`/`validateSession`, if a validated session
+  has `role === "guest"` but `config.guestMode.enabled` is now false, treat it as
+  unauthenticated (401). So flipping guest mode off immediately ends guest access.
+- **Expose availability:** extend `GET /api/session/needs-setup` (or add a sibling
+  `GET /api/session/guest-config`) to return `guestAllowed: boolean` so the **public**
+  Login page can decide whether to show the guest button. This must not leak any other
+  config.
+
+### Permission resolution
+`resolvePermissionContext` gains a `guest` branch. Signature extended to receive the
+live guest config:
+```ts
+resolvePermissionContext(role, userId, store, guestConfig?) => {
+  admin  → { capabilities: all CAPABILITIES, bots: "all" }
+  member → stored caps + stored bots            // unchanged
+  guest  → {
+    capabilities: new Set(),                     // holds NO member capabilities
+    bots: guestConfig.bots === "all" ? "all" : new Set(guestConfig.bots),
+    guest: guestConfig.permissions,              // resolved per-request from live config
+  }
+}
+```
+`PermissionContext` and `req.user` gain an optional `guest?: GuestPermissions`. Because
+`req.user` is rebuilt per request, toggling a permission or the bot scope takes effect on
+the guest's next request (no re-login).
+
+### Unified authorization gate (`src/web/middleware/authorize.ts`, new)
+Replaces `requirePermission('x')` on **guest-reachable** routes:
+```ts
+authorize({ capability?: Capability, guestFlag?: keyof GuestPermissions })
+  // 401 if no req.user
+  // admin  → next()
+  // guest  → (req.user.guest?.[guestFlag] === true) ? next() : 403   // also 403 if no guestFlag
+  // member → (capability && req.user.capabilities.has(capability)) ? next() : 403
+```
+- Member/admin semantics are **identical** to today's `requirePermission`.
+- A route with no `guestFlag` is automatically guest-denied (safe default).
+- `requireBotAccess` is unchanged and already enforces the guest `bots` scope (guests
+  flow through `req.user.bots`).
+- `requireAdmin` is unchanged (guests are non-admin → 403), so `/api/users` and
+  `/api/audit` stay locked.
+
+### Route changes (`src/web/api/player.ts`, `bot.ts`, `music.ts`)
+- Re-express guest-reachable player routes via `authorize({ capability, guestFlag })`:
+  - `/add`, `/add-song`, `/add-by-id` → `{ capability: "player.queue", guestFlag: "addToQueue" }`
+  - `/play-next-song` → `{ capability: "player.control", guestFlag: "playNext" }`
+    (members keep `player.control`; guests pass only via `playNext`)
+  - new guest-safe **play-now** → `{ capability: "player.control", guestFlag: "playNow" }`
+  - `/next` → `{ capability: "player.control", guestFlag: "skip" }`
+  - `/pause`,`/resume`,`/seek`,`/volume` → `{ capability: "player.control", guestFlag: "transport" }`
+  - `DELETE /queue/:index`, `/clear` → `{ capability: "player.queue", guestFlag: "removeClear" }`
+  - `/mode`, `/fm` → `{ capability: "player.control", guestFlag: "playMode" }`
+  - everything else stays `authorize({ capability })` (no guest flag) → guest-denied.
+- **Guest-safe play-now**: a new behavior (own route, e.g. `POST /:botId/play-now`, or a
+  `mode:"now"` branch) that does `queue.addNext(song)` then advances to it (skip into the
+  inserted track) — **no `queue.clear()`**. Members/admins may also use it; the existing
+  destructive `/play-song` stays for the normal ▶ in non-guest UI. Exact wiring decided
+  in the plan.
+- **Close ungated reads against guests:** `GET /api/bot/settings` and
+  `GET /api/music/quality` currently have no guard, so a guest could read config. Add a
+  small `requireNotGuest` guard (allow `admin` + `member`, deny `guest` → 403). This
+  **does not change member/admin behavior** — members keep their current read access; only
+  guests are newly denied. (Deliberately not a new member capability, to avoid touching
+  member semantics.)
+
+### WebSocket (`src/web/websocket.ts`, `src/web/server.ts`)
+- Guests authenticate over the WS upgrade unchanged (session cookie). 
+- **Add per-client bot-scope filtering** for guests: the upgrade handler already stamps
+  `ws.userId`; also resolve and stamp the client's bot scope (`"all"` or a Set). In
+  `setupWebSocket`, when sending `init` and broadcasting `stateChange` /
+  `botConnected/Disconnected/Removed`, **filter to bots the client may see**. For guests
+  with a scoped `bots` list, out-of-scope bots are omitted. Admin/member payloads are
+  unchanged (they resolve to `"all"` or their existing member scope — to avoid changing
+  member behavior, filtering may be applied **only when the client is a guest**; decided
+  in the plan).
+
+### Settings write (`POST /api/bot/settings`)
+Extend the existing settings writer (today only idle-timeout + auto-pause) to also accept
+and persist the `guestMode` block (admin-only via `bot.manage`/`requireAdmin`), calling
+`saveConfig`. Live effect: subsequent guest requests read the updated in-memory config.
+
+## Frontend design
+
+- **`useSession.ts`**: extend `User` with `role:'guest'` and a `guest?: GuestPermissions`
+  field (from `/api/session/me`). Add `isGuest` computed and `guestCan(flag)`; make `can`
+  guest-aware where it maps cleanly, but UI gating for guest-specific actions uses
+  `guestCan('addToQueue' | 'playNext' | ...)`. `canControlBot` already enforces the bot
+  scope and works for guests via the `bots` field.
+- **Login page (`Login.vue`)**: when `guestAllowed`, show a prominent
+  "以游客身份进入 / Continue as guest" button calling a new `session.continueAsGuest()`
+  → `POST /api/session/guest` → refresh → redirect to `?next` or home.
+- **Router (`web/src/router/index.ts`)**: in the global `beforeEach`, block guests from
+  `/settings` and `/setup` (redirect to home). Default-off ⇒ when not a guest, behavior
+  is unchanged.
+- **Navbar (`Navbar.vue`)**: hide the settings cog for guests; add a `游客` role badge
+  branch; the bot selector already filters via `canControlBot`, so scoped guests only see
+  allowed bots.
+- **App shell (`App.vue`)**: hide the mobile `/settings` tab for guests; the mini-player
+  transport reduces to the guest's allowed actions.
+- **SongCard / Queue / Player**: gate each action button by the matching `guestCan(flag)`
+  (e.g. show ▶/下一首/添加 per `playNow`/`playNext`/`addToQueue`; show skip/transport/
+  remove/clear/mode per their flags). Buttons a guest lacks are hidden, mirroring how
+  `Queue.vue` already gates on `can('player.queue')` / `can('player.control')`.
+- **Settings → Guest mode admin section (`Settings.vue`)**: new admin-only panel: a
+  master enable switch, the 7 permission checkboxes (with 中文 labels), and a bot scope
+  control (an "全部机器人 / all bots" toggle + per-bot checkboxes) reusing the existing
+  member permission-editor bot allow-list UI. Saving calls `POST /api/bot/settings` with
+  the `guestMode` block.
+
+## Defaults, migration & backward-compat
+
+- `getDefaultConfig().guestMode.enabled = false` ⇒ **no behavior change** on upgrade;
+  existing installs see nothing until an admin opts in.
+- Migration adds the reserved `__guest__` user row idempotently (guarded like the
+  existing `backfillMemberPermissions` `schema_meta` marker) and does **not** grant it
+  any `user_permissions` (guest authorization is config-driven, not row-driven).
+- `loadConfig` deep-merges `guestMode` so older config files gain the new block with
+  defaults.
+- Member/admin flows, capabilities, and the backfill are untouched.
+
+## Testing (TDD)
+
+- **Config**: `getDefaultConfig` includes `guestMode` default-off; `loadConfig`
+  deep-merges a partial `guestMode` (missing sub-keys back-filled); round-trips through
+  `saveConfig`.
+- **`resolvePermissionContext` guest branch**: empty member capabilities; `bots` `"all"`
+  vs scoped Set; `guest` permissions object passthrough.
+- **`authorize` gate**: admin bypass; member has/lacks capability → 200/403 (regression
+  parity with `requirePermission`); guest allowed only when the specific flag is true;
+  guest with no flag on a route → 403; guest on settings reads → 403.
+- **Enforcement (mirror `permissions-enforcement.test.ts`)**: each toggle independently
+  opens exactly its route(s) for a guest and nothing else; `/play-song`/`/play-playlist`/
+  `/play-album` always 403 for guests; per-bot scope: guest 403 on out-of-scope `:botId`.
+- **Session entry**: `POST /api/session/guest` → 403 when disabled, mints guest session
+  when enabled; guest session bypasses `MAX_SESSIONS_PER_USER`; disabling guest mode
+  invalidates existing guest sessions (401); guest TTL shorter than member TTL.
+- **WS scope**: guest receives only in-scope bots' `init`/`stateChange`; reject upgrade
+  unchanged for no cookie.
+- **Frontend** (where covered): `guestCan` gating; router blocks `/settings` for guests.
+
+## Non-goals (YAGNI)
+
+- No guest accounts/usernames, passwords, favorites, or persistence per guest.
+- No per-guest individual identity or rate-limiting beyond the existing IP rate limits
+  (a basic abuse guard on `/api/session/guest` is in; richer abuse controls are future).
+- No change to the `admin | member` capability semantics; guest is an additive,
+  config-driven third principal.
+- No chat-command (TeamSpeak `!add`/`!playnext`) changes — guest mode is **WebUI-only**
+  (the issue is explicitly about WebUI 鉴权).
+- Per-guest bot scoping beyond a single shared guest scope is out of scope (one guest
+  scope applies to all guests).
+
+## Key files touched
+
+Backend: `src/data/config.ts` (+test), `src/data/permissions.ts` (+test),
+`src/data/users.ts` (role union, reserved guest row), `src/data/database.ts` (migration),
+`src/data/sessions.ts` (guest TTL + cap bypass), `src/web/middleware/authorize.ts` (new,
++test), `src/web/middleware/requireNotGuest.ts` (new, small — for the config reads),
+`src/web/api/session.ts` (guest endpoint, `/me`, `needs-setup`),
+`src/web/api/player.ts` (re-gate + guest play-now), `src/web/api/bot.ts` (settings
+read-lock + guestMode write), `src/web/api/music.ts` (quality read-lock),
+`src/web/server.ts` + `src/web/websocket.ts` (WS scope), `src/web/auth/validateSession.ts`
+(guest disable→401), enforcement tests.
+
+Frontend: `web/src/composables/useSession.ts`, `web/src/views/Login.vue`,
+`web/src/router/index.ts`, `web/src/components/Navbar.vue`, `web/src/App.vue`,
+`web/src/components/SongCard.vue`, `web/src/components/Queue.vue`,
+`web/src/components/Player.vue`, `web/src/views/Settings.vue`,
+`web/src/stores/player.ts`.

docs/superpowers/specs/2026-06-25-ts-command-permissions-design.md

@@ -0,0 +1,116 @@
+# TeamSpeak chat-command permission control — design
+
+**Origin:** User request — "给 ts 命令也加上权限控制" (give the TS chat commands permission control too, like the WebUI already has). Completes the unused `adminGroups` scaffold the original authors left behind.
+**Date:** 2026-06-25
+**Status:** Approved (brainstorm), pending implementation plan
+
+## Scope
+
+Add permission control to **TeamSpeak chat commands** (`!play`, `!add`, `!stop`, …). Today any client in a channel with the bot can run any command; only the WebUI path is permission-gated. This adds a **binary admin gate** keyed on the sender's **TS server groups**: a fixed set of "admin" commands may be restricted to members of configured admin server-groups, while all other commands stay public. Enforcement is **opt-in and backward-compatible** — it activates only once an admin lists their server-group ID(s).
+
+The privileged server-groups are configured in `config.adminGroups` (already declared, currently unused) and become editable from the WebUI.
+
+## Problem
+
+`src/bot/commands.ts` already declares `PUBLIC_COMMANDS` / `ADMIN_COMMANDS` sets and an `isAdminCommand()` helper, and `src/bot/instance.ts:325` has the stub `// TODO: Check if invoker is in adminGroups` — but none of it gates anything. `config.adminGroups: number[]` (`src/data/config.ts:21,46`) is documented as a legacy placeholder and read nowhere. So chat commands are unauthenticated: anyone can `!stop`, `!clear`, `!remove`, move the bot, change volume/mode. The WebUI, by contrast, gates everything via `authorize()` at the HTTP layer.
+
+`executeCommand` (`instance.ts:351`) is **shared** by the chat handler and the WebUI player router; the WebUI gates at the HTTP layer, so the chat gate must live in the **chat handler**, never inside `executeCommand` (else the already-gated WebUI would be double-gated).
+
+## Decisions (from brainstorm)
+
+1. **Binary admin gate**, not per-group capabilities and not a whole-bot allowlist. Reuses the existing `adminGroups` scaffold.
+2. **Admin command set (fixed, one source of truth):** `stop`, `clear`, `remove`, `move`, `vol`, `mode`. Everything else is public. The set lives in one constant so reclassifying a command is a one-line change.
+3. **Default = open / opt-in (backward-compatible):** when `config.adminGroups` is empty (the default), there is **no enforcement** — admin commands stay open to everyone, exactly as today. Enforcement turns on only when `adminGroups` is non-empty.
+4. **Identity key = TS server groups**, matched against `adminGroups`.
+5. **Fail-closed on undeterminable groups:** if an admin command arrives, enforcement is on, and the sender's groups cannot be determined (even after a fallback lookup), **deny**.
+6. **Reply on deny:** the bot sends the sender a brief permission-denied message (silent denial is confusing; the bot already replies to commands).
+7. **Config surface:** `adminGroups` becomes editable from an admin-only WebUI Settings section, live-applied via the existing `/api/bot/settings` endpoint; `config.json` continues to work.
+
+## Permission model
+
+Tier definitions live in `src/bot/commands.ts` (repurpose the existing dead sets; the admin set is the source of truth):
+- **Admin commands:** `stop`, `clear`, `remove`, `move`, `vol`, `mode`.
+- **Public commands:** all others (`play`, `add`, `playnext`/`pn`, `skip`/`next`, `prev`, `pause`, `resume`, `now`, `queue`/`list`, `lyrics`, `vote`, `help`, `search`/`find`, `playlist`, `album`, `artist`, `fm`).
+
+**Enforcement rule** — a command is **allowed** iff:
+1. it is a public command, **OR**
+2. `config.adminGroups` is empty (enforcement off), **OR**
+3. the sender's server groups ∩ `config.adminGroups` ≠ ∅.
+
+Otherwise it is **denied** (no execution; a denial reply is sent).
+
+Expressed as a pure, unit-testable helper (no TS/async dependency):
+```ts
+// returns true = allowed, false = denied
+function canRunCommand(
+  commandName: string,
+  invokerGroups: readonly (string | number)[],
+  adminGroups: readonly number[]
+): boolean
+```
+- not an admin command → `true`.
+- admin command, `adminGroups.length === 0` → `true` (enforcement off).
+- admin command, non-empty `adminGroups` → `true` iff any `invokerGroups` value (normalized to number/string consistently) is in `adminGroups`, else `false`.
+
+> Note: `invokerGroups` from TS are strings; `adminGroups` are numbers. Normalize both sides (compare as the same type) to avoid `"6" !== 6` bugs.
+
+## Identity resolution
+
+The TS library already delivers the sender's server groups on each chat event (`TextMessage.invokerGroups: string[]` in `@honeybbq/teamspeak-client`), but the wrapper type `TS3TextMessage` (`src/ts-protocol/client.ts:58-64`) and its mapping (`client.ts:205-214`) **drop** it.
+
+Changes:
+1. Add `invokerGroups: string[]` to `TS3TextMessage` and populate it from `msg.invokerGroups` in the mapping.
+2. **Availability caveat:** `invokerGroups` is populated only when the sender's client is in the bot's local cache (typically same channel / in view). For a private message from an unseen client, it is `[]`.
+3. **Fallback lookup (only when needed):** in the gate, if the command is admin-gated **and** enforcement is on **and** `invokerGroups` is empty, perform a targeted lookup of the sender's groups keyed on `invokerId` (clid) — reuse the already-wrapped `getClientsInChannel()` (`client.ts:314-323`, whose `ClientInfo` carries `serverGroups`), or add a thin wrapper around the library's `getClientInfo(client, clid)` for a precise `clientinfo` query. This query is skipped entirely for public commands, when enforcement is off, and when the event already carried groups (the common "listener in the channel types `!stop`" case).
+4. **Fail-closed:** if after the fallback the groups are still unknown, deny the admin command.
+
+## Enforcement seam
+
+In `handleTextMessage` (`src/bot/instance.ts:317`), replace the dead stub at `instance.ts:325-327` with the real check, placed after `parseCommand` succeeds and **before** `executeCommand` (`instance.ts:335`):
+- compute `allowed` via `canRunCommand(parsed.name, msg.invokerGroups, this.config.adminGroups)`, performing the async fallback lookup only when the synchronous check is "deny due to empty groups on an admin command with enforcement on";
+- if denied → send the denial reply to `msg` (respecting its `targetMode`/sender) and return without executing;
+- if allowed → `executeCommand(parsed, msg)` as today.
+
+`executeCommand` stays permission-agnostic, so the WebUI path is unaffected.
+
+**Live config:** `BotInstance` already holds the shared `config` object by reference (passed through `BotInstanceOptions`); `POST /api/bot/settings` mutates that same object in place, so reading `this.config.adminGroups` in the gate reflects edits immediately — no restart, no re-wiring. (Implementation must confirm the instance reads `adminGroups` from the live `config` reference, not a copied-at-construction value.)
+
+## Denied UX
+
+The bot replies to the sender with a short bilingual-ish message, e.g. `⛔ 需要管理员权限（该命令仅限管理员服务器组）`, via the same reply mechanism the command handlers already use, honoring the message's `targetMode` (private vs channel). No execution occurs.
+
+## Config surface
+
+**Backend** (`src/web/api/bot.ts`): extend the existing settings endpoints (already admin-gated: `GET` behind `requireNotGuest`, `POST` behind `requirePermission("bot.manage")`):
+- `GET /api/bot/settings` → also return `adminGroups: number[]`.
+- `POST /api/bot/settings` → also accept `adminGroups`; validate it is an array of non-negative integers (filter/reject otherwise), assign to `config.adminGroups`, `saveConfig`. Reuses the in-place-mutation + `saveConfig` pattern already used for idle-timeout/auto-pause/guestMode, so it is live-applied.
+
+**Frontend** (`web/src/views/Settings.vue`): a new admin-only section **"命令权限 / Command permissions"** (`v-if="session.isAdmin.value"`), mirroring the idle-timeout/guest-mode sections:
+- a text input for comma-separated server-group IDs (parsed to `number[]`, ignoring blanks/non-numbers), a Save button calling `POST /api/bot/settings`, hydrated by the existing `loadIdleTimeout()` GET;
+- hint: "仅这些组可运行 stop/clear/remove/move/vol/mode；留空 = 不限制（所有人可用）。如何查看服务器组 ID 见 README。"
+
+**`config.json`**: `adminGroups` continues to work for file-based config.
+
+## Testing
+
+- **`canRunCommand` unit tests** (`src/bot/commands.test.ts` or a new file): public command always allowed; admin command with empty `adminGroups` allowed; admin command with a matching group allowed; admin command with no matching group denied; string-vs-number normalization (`["6"]` matches `[6]`).
+- **Handler gate tests:** a denied admin command does NOT call `executeCommand` and triggers a denial reply; an allowed admin command (matching group) and any public command DO call `executeCommand`. (Use a fake `msg` + a `config` with `adminGroups` set; stub the reply + `executeCommand`.)
+- **Fallback path:** admin command with empty `invokerGroups` + enforcement on triggers the group lookup; if the lookup yields a matching group → allowed; if it yields nothing → denied (fail-closed).
+- **Settings round-trip** (`src/web/api/bot.test.ts`): `POST /api/bot/settings` persists a validated `adminGroups`; `GET` returns it; invalid values (non-array, negative, non-integer) are rejected/filtered.
+- **Frontend:** `vue-tsc --noEmit` clean.
+
+## Non-goals (YAGNI)
+
+- No per-group capability map and no whole-bot allowlist (binary admin gate only).
+- No per-command customization of the admin/public split in the UI (the set is a code constant; reclassifying is a one-line edit).
+- No server-group picker UI (admin types IDs; a picker that lists the bot's visible groups is a possible future enhancement).
+- No new chat *management* commands.
+- No change to the WebUI authorization model or `executeCommand` semantics.
+
+## Key files touched
+
+Backend: `src/bot/commands.ts` (admin-set constant + `canRunCommand` helper, repurpose the dead sets; +test), `src/bot/instance.ts` (gate in `handleTextMessage`, denial reply, live `adminGroups`), `src/ts-protocol/client.ts` (surface `invokerGroups` on `TS3TextMessage`; possibly a `getClientInfo` wrapper for the fallback), `src/web/api/bot.ts` (settings read/write `adminGroups`; +test). Possibly `src/data/config.ts` (no schema change; `adminGroups` already exists).
+
+Frontend: `web/src/views/Settings.vue` (admin-only 命令权限 section).
+
+Docs: `README.md` (document the feature + how to find TS server-group IDs).

docs/superpowers/specs/2026-07-01-spotify-source-design.md

@@ -0,0 +1,202 @@
+# Spotify audio source (optional, hybrid librespot) — design spec
+
+- **Issue:** [#112 — Support for Spotify audio source](https://github.com/ZHANGTIANYAO1/teamspeak-music-bot/issues/112)
+- **Date:** 2026-07-01
+- **Status:** Approved (design) — pending implementation plan
+- **Chosen approach:** Hybrid — real Spotify streaming via a librespot-family sidecar, with **go-librespot on Linux/Docker** and **Rust librespot on Windows**, behind one backend interface.
+
+---
+
+## 1. Summary
+
+Add `spotify` as a new **optional** `MusicProvider`. Metadata (search / track / album / playlist) is read from the official **Spotify Web API**. Audio is the *real* Spotify stream, produced by a librespot-family sidecar and piped through ffmpeg into the bot's existing voice path.
+
+The feature is **disabled by default**, opt-in, and **requires the user's own Spotify Premium account**. librespot is an unofficial, reverse-engineered client and using it **violates Spotify's Terms of Service** (account-ban risk). This is surfaced to the user as an explicit experimental warning, and no credentials are ever bundled.
+
+If the feature is disabled, unauthenticated, or the sidecar binary is missing, the provider disables itself gracefully — exactly like `YouTubeProvider` when `yt-dlp` is absent (empty results, greyed-out in the UI, no crash).
+
+## 2. Goals / Non-goals
+
+**Goals**
+- First-class `spotify` source: search, play, playlist/album import, lyrics best-effort, login status.
+- Real Spotify audio (Premium), not a YouTube match.
+- Cross-platform: works on the project's three deployments — native Windows one-click, Linux systemd, Docker.
+- Strictly optional and safe-by-default; zero impact when off.
+- Mixed queues keep working (Spotify tracks interleaved with netease/qq/etc.).
+
+**Non-goals**
+- No free-tier audio (Premium is mandatory for librespot streaming).
+- No bundled Spotify credentials or shared Developer app.
+- No replacement of, or change to, existing sources' behavior.
+- No CI e2e against live Spotify (requires Premium; manual only).
+
+## 3. Backend selection
+
+`spotify.backend: "auto" | "go-librespot" | "librespot"` (default `auto`).
+
+| Platform | `auto` resolves to | Why |
+|---|---|---|
+| Windows | `librespot` (Rust) | go-librespot has **no** Windows binary and its FIFO capture is POSIX-only |
+| Linux / Docker | `go-librespot` (fallback `librespot`) | clean REST play-by-URI + prebuilt Linux binary |
+| macOS | `librespot` (or `go-librespot` if built) | no go-librespot macOS binary published |
+
+The split is **platform-determined**, not a per-run user toggle (a user may still force one via config if they have the binary).
+
+## 4. Architecture
+
+### 4.1 The seam — `SpotifyAudioBackend`
+
+New file `src/music/spotify/backend.ts`:
+
+```ts
+export interface SpotifyTrackEndedEvent { uri: string; reason: "ended" | "stopped" | "error"; }
+
+export interface SpotifyAudioBackend {
+  start(): Promise<void>;                    // launch sidecar + resampling ffmpeg
+  stop(): void;                              // tear everything down
+  isReady(): boolean;                        // device online & streamable
+  playTrack(uri: string): Promise<void>;     // begin ONE track (spotify:track:...)
+  pause(): Promise<void>;
+  resume(): Promise<void>;
+  seek(ms: number): Promise<void>;
+  getPcmStream(): Readable;                   // 48kHz s16le stereo (post-ffmpeg)
+  getPosition(): number;                      // ms into current track
+  on(event: "trackEnded", cb: (e: SpotifyTrackEndedEvent) => void): void;
+  on(event: "metadata", cb: (m: SpotifyNowPlaying) => void): void;
+  on(event: "ready" | "error", cb: (arg?: unknown) => void): void;
+}
+```
+
+Both implementations emit the **same** 48 kHz s16le stereo PCM and the **same** events, so everything above the seam (provider, controller, player, UI) is backend-agnostic.
+
+### 4.2 `GoLibrespotBackend` (Linux/Docker) — `src/music/spotify/go-librespot.ts`
+
+- Writes a `config.yml` with `server: { enabled: true, address: 'localhost', port: <p> }`, `audio_backend: 'pipe'`, `audio_output_pipe: '<fifo>'`, `audio_output_pipe_format: 's16le'`, `bitrate: 320`, credentials block.
+- `start()`: `mkfifo <fifo>` → **spawn the FIFO-reading ffmpeg first** → then spawn go-librespot. (FIFO open ordering is mandatory: go-librespot opens the write end with `O_WRONLY|O_NONBLOCK` and errors `ENXIO` if no reader exists yet.) ffmpeg: `-f s16le -ar 44100 -ac 2 -i <fifo> -f s16le -ar 48000 -ac 2 -`. ffmpeg stdout = `getPcmStream()`.
+- Control (REST): `POST /player/play {uri}`, `POST /player/pause`, `POST /player/resume`, `POST /player/seek {position}`. `GET /status` for position.
+- Events (WebSocket `/events`): `metadata` → `metadata`; `not_playing` → `trackEnded` (track boundaries can NOT be read from the FIFO — it is gapless/continuous and never EOFs between tracks).
+- Metadata token: go-librespot exposes `POST /token` (first-party session token) and a `/web-api/<path>` proxy to `api.spotify.com` — so on this backend a separate Spotify Developer app is **optional**.
+- Recovery: on reader death go-librespot's write returns `EPIPE` and closes the pipe output; backend restarts the ffmpeg reader + reactivates the device.
+
+### 4.3 `RustLibrespotBackend` (Windows / cross-platform) — `src/music/spotify/rust-librespot.ts`
+
+Rust librespot is a **passive Spotify Connect receiver**; the bot acts as the **Connect controller** via the Spotify Web API.
+
+- `start()`: spawn `librespot --backend pipe --name "<deviceName>" --bitrate 320 --cache <dir> [--access-token <tok> | --enable-oauth]`. With **no `--device`**, librespot writes raw PCM (**s16le, 44100 Hz, stereo**) to **stdout** (cross-platform; verified against `pipe.rs` — `None => Box::new(io::stdout())`). Pipe stdout → ffmpeg `-f s16le -ar 44100 -ac 2 -i pipe:0 -f s16le -ar 48000 -ac 2 -` → `getPcmStream()`. Do **not** pass `--passthrough` (that emits raw Ogg, not PCM).
+- `playTrack(uri)`: `GET /v1/me/player/devices` → find our `device_id` by `deviceName` → `PUT /v1/me/player/play?device_id={id}` body `{uris:[uri]}`. `pause/resume/seek` → `PUT /v1/me/player/{pause,play,seek}`.
+- `trackEnded`: poll `GET /v1/me/player` (is_playing → false / `item` changed / `progress_ms ≈ duration_ms`) plus optional `--onevent` hook (read-only notifications). Add a watchdog + retry/backoff for device-visibility latency and command `202/404` flakiness.
+- Requires a **user OAuth token** with scopes `streaming user-read-playback-state user-modify-playback-state user-read-currently-playing` (+ `playlist-read-private playlist-read-collaborative` for user playlists).
+
+## 5. Shared subsystems
+
+### 5.1 Metadata — `src/music/spotify/webapi.ts`
+
+Thin `axios` client mapping Spotify catalog objects → the bot's `Song` / `Playlist` / `Album`:
+- `GET /v1/search?type=track,album,playlist&q=…`
+- `GET /v1/tracks/{id}`, `GET /v1/albums/{id}/tracks`, `GET /v1/playlists/{id}/tracks`
+
+All confirmed still available with a normal token **after** Spotify's 2024-11-27 cut (that cut removed related-artists, recommendations, audio-features/analysis, featured/category playlists, and `preview_url` — none of which we use). Token source is pluggable: user Developer-app token (primary) or go-librespot `/web-api` proxy (go-librespot path). Handle `429 Retry-After` (rolling 30 s window; dev-mode quota).
+
+### 5.2 Auth — `src/music/spotify/auth.ts`
+
+One web-UI **Authorization-Code + PKCE** login.
+- **Primary:** the user registers their own Spotify Developer app (Client ID [+ Secret] + redirect URI) — reliable, ToS-cleaner. The resulting access token drives metadata + Web-API control; the refresh token is persisted (credential store); access tokens (~1 h) auto-refresh. The same token bootstraps librespot via `--access-token`, after which librespot caches reusable credentials — **one user-facing login**.
+- **Fallbacks:** librespot `--enable-oauth` (built-in client `65b708073fc0480ea92a077233ca87bd`, redirect `http://127.0.0.1:8898/login`) or go-librespot interactive login (`http://127.0.0.1:36842/login?code=…`) as a separate one-time step; go-librespot `/web-api` proxy when no Developer app is provided.
+- Username/password is **dead** (removed by Spotify in 2024); do not implement it.
+
+### 5.3 Provider — `src/music/spotify/provider.ts`
+
+`SpotifyProvider implements MusicProvider` with `platform: "spotify"`:
+- `search`, `getSongDetail`, `getPlaylistSongs`, `getAlbumSongs`, `getLyrics` (best-effort/empty), `getRecommendPlaylists` → Web API.
+- `getAuthStatus()` reports login state **and** backend/binary availability (drives greying-out in UI, like YouTube).
+- `getSongUrl(id)` returns a **sentinel** (`{ url: "spotify:track:<id>" }`) — actual playback is via the backend/controller, not a URL. `instance.ts` recognizes the sentinel and routes to the `SpotifyController`.
+- QR-code login methods are no-ops; Spotify uses the OAuth card instead.
+
+## 6. Queue / player / instance integration
+
+- **`SpotifyController`** (`src/music/spotify/controller.ts`, one per bot): owns the chosen backend and the Web-API/auth clients; exposes `playTrack/pause/resume/seek/stop` and forwards `trackEnded`/`metadata`.
+- **`AudioPlayer` — new external-PCM mode:** add `playPcmStream(readable, { onExternalEnd })` that feeds the existing `pcmBuffer` → 20 ms frame loop → encoder → `frame` path **without spawning a url-ffmpeg**. For Spotify, `trackEnd` is driven by the backend's `trackEnded` event (the librespot→ffmpeg pipeline is long-lived and does not exit per song). `pause/resume/seek` on a Spotify song are routed to the backend by `instance.ts` (and gate frame emission locally for crisp UI state).
+- **`instance.ts`:** `getProviderFor("spotify")`, a `-s` command flag in `getProvider(flags)`. When a dequeued `song.platform === "spotify"`: ensure the controller/backend is started + device active, `playTrack(uri)`, attach the player to the backend PCM. On `trackEnded` → advance the queue. When a **non-Spotify** song is next, **pause the sidecar** (so it doesn't buffer ahead) and use the normal `player.play(url)` path. This preserves one-track-at-a-time on-demand playback and mixed-source queues.
+- Real-time pacing is guaranteed by the voice consumer: TS voice pulls 20 ms frames at real time → the player reads PCM at real time → ffmpeg's read of the sidecar stalls → sidecar backpressure pauses decode. (This is why go-librespot's pull model avoids the classic librespot "plays too fast / skips" bug; Rust librespot to stdout is likewise paced by our reads.)
+
+## 7. Config, opt-in & safety
+
+`BotConfig.spotify` (all default-off), added to `getDefaultConfig()` and sanitized in `loadConfig()`:
+
+```ts
+spotify: {
+  enabled: false,
+  backend: "auto",              // "auto" | "go-librespot" | "librespot"
+  clientId: "",                 // user's Developer app (optional on go-librespot path)
+  clientSecret: "",             // optional — PKCE needs none; only for confidential/client-credentials flows
+  deviceName: "TSMusicBot",
+  bitrate: 320,                 // 96 | 160 | 320
+}
+```
+
+Inert unless `enabled` **and** logged-in **and** a resolvable binary. First-run/settings shows the experimental + ToS + Premium + own-credentials warning. Never store or transmit shared secrets.
+
+## 8. Web UI
+
+- Add `spotify` to `platform` and `Source` unions (`web/src/stores/player.ts`, `web/src/stores/sourceTabs.ts`).
+- `SourceTabs.vue`: add "Spotify" tab; `SongCard.vue`: green **#1DB954** badge; `variables.scss`: `--brand-spotify` tokens.
+- `stores/player.ts`: extend `authStatus` / `recommendPlaylists` / `dailySongs` / `userPlaylists` maps + the auth/recommend fetch fan-out.
+- Settings: a **Spotify login card distinct from the QR cards** — "Connect Spotify" OAuth button, optional Client ID/Secret fields, backend/binary status indicator, and the risk disclaimer.
+
+## 9. Binary / dependency resolution — `src/music/spotify/binary.ts`
+
+Mirror `findYtDlp()`: resolve `go-librespot` / `librespot(.exe)` from `bin/` then PATH; positive availability cached, negative retried (install-while-running).
+- **No prebuilt Rust librespot exists** (source-only: `cargo install librespot`, distro/`scoop`/`choco`, or a binary dropped in `bin/`).
+- **go-librespot** ships **Linux-only** assets (`go-librespot_linux_{x86_64,arm64,armv6,armv6_rpi}.tar.gz`, ~6 MB, at `github.com/devgianlu/go-librespot/releases`). Docker build downloads the correct Linux asset; optional runtime auto-download (like yt-dlp). go-librespot is **GPL-3.0** → sidecar = mere aggregation (does not infect the Node code); ship its license text + a source offer.
+- Unresolved binary → source disabled with an actionable "install X / see docs" message.
+
+## 10. Testing
+
+Vitest, mocking child processes and HTTP:
+- Web-API response → `Song/Playlist/Album` mapping.
+- `chooseBackend()` per platform/config.
+- Auth: PKCE challenge, token refresh, credential persistence.
+- Config load/sanitize (defaults, hand-edited/corrupt input).
+- `SpotifyProvider` methods (mock webapi).
+- Player external-PCM path: feed a fake `Readable` → assert `frame` emission + `trackEnd` on external end.
+- go-librespot `/events` → `trackEnded` translation; Rust-backend Web-API poll → `trackEnded`.
+- e2e against live Spotify is **manual & documented** (Premium required), not CI.
+
+## 11. Files touched
+
+**New:** `src/music/spotify/{provider,backend,go-librespot,rust-librespot,webapi,auth,controller,binary}.ts` (+ `.test.ts`).
+**Edited (backend):** `src/music/provider.ts` (union: `Song`/`Playlist`/`Album`/`MusicProvider`), `src/index.ts`, `src/bot/manager.ts`, `src/bot/instance.ts` (router + `-s` flag + spotify routing), `src/audio/player.ts` (external-PCM mode), `src/data/config.ts`, `src/music/auth.ts` (credential store union), `src/web/api/auth.ts`, `src/web/api/music.ts` (routers + search aggregation), `src/web/server.ts`, `src/data/database.ts` (platform).
+**Edited (frontend):** `web/src/stores/player.ts`, `web/src/stores/sourceTabs.ts`, `web/src/components/SourceTabs.vue`, `web/src/components/SongCard.vue`, `web/src/styles/variables.scss`.
+**Docs:** `README.md` (Spotify section + warnings + install notes).
+
+## 12. Staged rollout
+
+1. **Metadata + provider + config + UI plumbing** (no audio): `spotify` source searchable/browsable; playback returns "not yet playable". Fully testable without a sidecar.
+2. **go-librespot backend (Linux/Docker):** real playback on Linux; REST + FIFO + WebSocket.
+3. **Rust librespot backend (Windows):** stdout PCM + Web-API Connect control.
+4. **Polish:** recovery/watchdog, docs, binary auto-download, README.
+
+## 13. Risks & open questions
+
+- **Rust librespot control is the top risk** — Connect device visibility/latency, poll-based track-end. Mitigation: retry/backoff + watchdog; degrade to "skipped" on repeated failure.
+- **One-OAuth-token bootstraps librespot** (`--access-token` from the user's own app client) is *plausible but unverified* — may fall back to two one-time logins. Verify with a spike in stage 3.
+- **Windows go-librespot is impossible** (FIFO) → Windows always uses Rust librespot.
+- **Token scope from librespot's built-in client** may not include `user-modify-playback-state`; if so, a user Developer app is required for the Rust/Windows control path.
+- Large surface area → staged rollout above; each stage independently shippable.
+
+## Appendix A — Verified technical facts (with sources)
+
+go-librespot API (`devgianlu/go-librespot`, v0.7.x):
+- REST: `POST /player/{play,pause,resume,playpause,stop,next,prev,seek,volume,add_to_queue}`, `GET /status`, `GET /` (`{playback_ready}`), `POST /token`, `GET|POST /web-api/<path>`. `POST /player/play` body `{uri, skip_to_uri?, paused?}`. Server enabled only when `server.enabled: true`.
+- WebSocket `/events` envelopes `{type, data}`; types include `metadata, will_play, playing, paused, not_playing, stopped, seek, volume, active, inactive`. Track-end = `not_playing`.
+- Pipe backend: continuous raw PCM, no header, 44100 Hz stereo, format `s16le|s32le|f32le`; FIFO opened once; POSIX-only. Backpressure real (blocks when reader stalls).
+- Sources: `github.com/devgianlu/go-librespot` (README, `api-spec.yml`, `daemon/api_server.go`, `output/driver-pipe.go`).
+
+Rust librespot (`librespot-org/librespot`, v0.8.0, MIT):
+- `--backend pipe` with no `--device` → raw PCM to **stdout**; default S16 / 44100 / stereo; `--format` for higher bit depth; `--passthrough` = raw Ogg (do not use). Passive Connect receiver — no play-by-URI; control via Web API Connect. `--onevent` = read-only hook. No prebuilt binaries.
+- Sources: `github.com/librespot-org/librespot` wiki (Audio-Backends, Options), `librespot_playback/audio_backend/pipe.rs`, `docs/authentication.md`.
+
+Spotify auth & Web API:
+- Username/password removed (2024); use OAuth (Auth-Code+PKCE) or Zeroconf. Premium required for librespot audio.
+- Client-Credentials token authorizes `/v1/search` + public track/album/playlist GETs; 2024-11-27 cut did **not** touch these. Token endpoint `POST https://accounts.spotify.com/api/token` (`grant_type=client_credentials`, Basic base64(id:secret), `expires_in=3600`, no refresh). 429 on a rolling 30 s window.
+- Sources: `developer.spotify.com` (Web API docs; 2024-11-27 blog), `librespot` `docs/authentication.md`.

docs/superpowers/specs/2026-07-06-save-load-playlist-design.md

@@ -0,0 +1,227 @@
+# Save/Load Playlists + Queue Persistence — Design
+
+**Issue:** [#119](https://github.com/ZHANGTIANYAO1/teamspeak-music-bot/issues/119) — 加入保存和加载播放清单功能
+**Date:** 2026-07-06
+**Status:** Approved (design), pending implementation plan
+
+## Problem
+
+The play queue lives only in memory (`PlayQueue` inside each `BotInstance`). It is lost in two situations the user calls out:
+
+1. **On restart** — the process stops, the in-memory queue is gone.
+2. **On "直接播放"** — `!play <song>` (and the WebUI "play now" path) call `queue.clear()`, wiping the queue to play one song.
+
+The user wants to stop losing the queue. Two related-but-separate capabilities were agreed:
+
+- **Named save/load** of queues (manual), plus **auto-restore** of the live queue across restarts.
+- An **independent** option to make single-song immediate-play *not* clear the queue.
+
+Everything ships **behind admin/independent toggles that default OFF**, so existing behavior is unchanged until an operator opts in.
+
+## Scope & agreed decisions
+
+| Decision | Choice |
+| --- | --- |
+| Core behavior | **Both** — named save/load **and** auto-restore live queue across restart |
+| Saved-queue ownership | **Per-user** (like `favorite_playlists`), plus a reserved `__shared__` owner for chat + opt-in sharing |
+| Trigger surface | **Web + chat** commands |
+| Auto-restore on restart | **Restore and resume playing** (gated by `savedQueuesEnabled`) |
+| Load semantics | **Replace (default) + append option** (`-a` flag / WebUI Append button) |
+| Feature gate | `savedQueuesEnabled` — **default false, admin-controlled** |
+| Single-play clear | Independent `playKeepsQueue` toggle — **default false** |
+
+### Out of scope (YAGNI)
+
+- Renaming a saved queue (delete + re-save instead).
+- Mid-track resume on restart (resume from the current track's **start**; URLs are re-resolved).
+- Normalized per-song storage (songs stored as a JSON blob).
+- Sharing granularity beyond "private to me" vs "shared" (one boolean).
+
+## Storage approach
+
+A saved queue is an ordered list of songs that is only ever saved and loaded **whole** — never queried song-by-song. So songs are stored as a **JSON `TEXT` blob**, not a normalized child table. Each stored song is a `QueuedSong` **without `url`** (URLs are resolved lazily at play time, exactly as today). This mirrors how `QueuedSong` already flows and keeps the schema to a single row per saved queue.
+
+---
+
+## Feature 1 — Named save/load (`savedQueuesEnabled`)
+
+### Data model
+
+New table:
+
+```sql
+CREATE TABLE IF NOT EXISTS saved_queues (
+  id        INTEGER PRIMARY KEY AUTOINCREMENT,
+  ownerId   TEXT NOT NULL,          -- WebUI user id, or the reserved SHARED owner
+  name      TEXT NOT NULL,
+  songs     TEXT NOT NULL,          -- JSON array of stored songs (QueuedSong minus url)
+  songCount INTEGER NOT NULL DEFAULT 0,
+  createdAt TEXT NOT NULL DEFAULT (datetime('now')),
+  updatedAt TEXT NOT NULL DEFAULT (datetime('now')),
+  UNIQUE(ownerId, name)
+);
+CREATE INDEX IF NOT EXISTS idx_saved_queues_ownerId ON saved_queues(ownerId);
+```
+
+- **`ownerId`** is either a real user id **or** a reserved constant `SHARED_QUEUE_OWNER = "__shared__"` (a value that can never collide with a real user id).
+- **Ownership rule (reconciles per-user with chat):**
+  - **WebUI save** has a **"共享 (shared)" checkbox.** Off → `ownerId = req.user.id` (private to you). On → `ownerId = SHARED_QUEUE_OWNER`.
+  - **Chat `!save`** always writes `ownerId = SHARED_QUEUE_OWNER` (TeamSpeak users have no WebUI account).
+  - **WebUI list** shows **your own + shared** (labeled). **Chat `!queues`/`!load`** see **shared only**.
+- **Overwrite:** `UNIQUE(ownerId, name)` → save is an **upsert** (same owner+name replaces `songs`, `songCount`, `updatedAt`).
+- **Caps** (reject with a clear message): ≤ **50** saved queues per owner; ≤ **1000** songs per saved queue.
+
+### DB methods (added to `BotDatabase`)
+
+```ts
+saveQueue(ownerId: string, name: string, songs: StoredSong[]): SavedQueue;   // upsert
+listSavedQueues(ownerId: string, includeShared: boolean): SavedQueueMeta[];  // meta only (no songs blob)
+getSavedQueue(id: number): SavedQueue | null;                                // full, with songs
+deleteSavedQueue(id: number): boolean;
+```
+
+- `StoredSong` = `Omit<QueuedSong, "url">`.
+- `SavedQueueMeta` = row without the `songs` blob (id, ownerId, name, songCount, timestamps) — keeps list responses light.
+- JSON (de)serialize at the DB boundary; parse failures on a corrupt blob degrade to an empty song list (never throw into a route).
+
+### Web API — `src/web/api/saved-queues.ts`
+
+All routes require auth + `player.queue` capability, and **404/403 when `savedQueuesEnabled` is false** (feature inert).
+
+| Method / path | Behavior |
+| --- | --- |
+| `GET /api/saved-queues` | list current user's own + shared (meta only) |
+| `POST /api/saved-queues` | body `{ botId, name, shared? }` → snapshot that bot's **current queue** songs, upsert |
+| `POST /api/saved-queues/:id/load` | body `{ botId, mode: "replace"\|"append" }` → load into that bot |
+| `DELETE /api/saved-queues/:id` | delete (only own or shared; not another user's private) |
+
+Ownership check on load/delete: allow if `ownerId === req.user.id` or `ownerId === SHARED_QUEUE_OWNER`; else 404 (no existence leak, matching the favorites pattern).
+
+### Chat commands (new, in `BotInstance.executeCommand`)
+
+- `!save <名称>` — save current queue → shared bucket.
+- `!load <名称>` — replace queue with a saved (shared) queue and play.
+- `!load -a <名称>` — append a saved (shared) queue to the end.
+- `!queues` — list shared saved queues (names + counts).
+
+All four reply **"此功能未启用"** when `savedQueuesEnabled` is false. Added to help text and the command table.
+
+### Load semantics (shared by web + chat)
+
+- **replace** — `queue.clear()`, add all stored songs, `queue.play()` + `resolveAndPlay(first)` (same shape as `cmdPlaylist`). Exits FM mode.
+- **append** — add all stored songs to the end; if idle, start the first newly-added one; never interrupts a playing track.
+- Loaded songs are re-tagged with a `requestedBy` of the loader (WebUI username / `游客` / chat `invokerName`) so play-history attribution stays correct (integrates with #121).
+
+### WebUI
+
+A new **"已保存队列 / Saved Queues"** page (nav entry visible only when `savedQueuesEnabled`):
+
+- **Save current queue**: name input + **共享** checkbox → `POST`.
+- Per entry (reusing `SongCard`/list styles): **Load** (replace), **Append**, **Delete**, showing name / song count / shared badge / owner.
+- Store/composable follows the existing `favorites` pattern.
+
+---
+
+## Feature 2 — Auto-restore live queue across restart (`savedQueuesEnabled`)
+
+Gated by the **same** `savedQueuesEnabled` flag (part of the "saved queues" feature).
+
+### Data model
+
+One row per bot (the live snapshot, continuously overwritten):
+
+```sql
+CREATE TABLE IF NOT EXISTS queue_state (
+  botId        TEXT PRIMARY KEY,
+  songs        TEXT NOT NULL,       -- JSON array of StoredSong
+  currentIndex INTEGER NOT NULL,
+  mode         TEXT NOT NULL,       -- PlayMode value
+  isFmMode     INTEGER NOT NULL DEFAULT 0,
+  fmPlatform   TEXT NOT NULL DEFAULT '',
+  updatedAt    TEXT NOT NULL DEFAULT (datetime('now'))
+);
+```
+
+DB methods: `saveQueueState(state)` (upsert), `getQueueState(botId)`, `clearQueueState(botId)`.
+
+### Snapshot (write path)
+
+- Add `PlayQueue.snapshot(): QueueSnapshot` and `PlayQueue.restore(snapshot)`.
+  - `snapshot` captures `songs` (minus url), `currentIndex`, `mode`.
+  - `restore` rebuilds `songs`, `currentIndex`, `mode`, and resets the derived `playedIndices`/`history`/`forwardStack` to a clean, consistent state for the restored index.
+- `BotInstance` writes the snapshot **debounced (~1 s)** on `stateChange` (queue mutations, track changes, and mode changes already emit `stateChange`). FM mode + fm platform captured alongside.
+- When the queue becomes empty (`clear()` with nothing re-added), the row is cleared via `clearQueueState`.
+
+### Restore (read path — "resume and play")
+
+When a bot reaches **connected/ready** (the same lifecycle point `autoStart` uses):
+
+1. If `savedQueuesEnabled` and a `queue_state` row exists → `PlayQueue.restore(...)`, restore FM mode/provider.
+2. If there was a current track → `resolveAndPlay(current)` (re-resolves URL, plays **from the track's start**).
+
+**Honest caveats (documented in README + spec):**
+
+- Resumes the **current track from its start**, not the exact millisecond (URLs are re-resolved; no persisted elapsed/seek).
+- **Spotify** auto-resume is **best-effort** — it depends on the sidecar/controller being back up; non-Spotify sources are reliable.
+- Resume only happens for bots that reach the connected state (auto-started, or on next manual start).
+
+---
+
+## Feature 3 — `playKeepsQueue` (independent single-play toggle)
+
+**Independent** config flag, **not** gated by `savedQueuesEnabled`. Default false → today's behavior.
+
+Affects **single-song immediate play only**: chat `!play <song | #N | id:<id> | URL>` and the WebUI play-now / play-by-id path.
+
+| `playKeepsQueue` | `!play <song>` behavior |
+| --- | --- |
+| `false` (default) | `queue.clear()` → play only that song (today) |
+| `true` | `addNext(song)` (insert after current) → `playAt(insertedAt)` (jump & play now) → `resolveAndPlay`; queue **kept**; on track-end, `next()` continues the queue |
+
+- Reuses existing `PlayQueue.addNext` + `playAt` — **no new queue logic.**
+- **Not** applied to collection loads — `!playlist` / `!album` / `!artist` / `!fm` still replace the queue (loading a collection is meant to replace; the request is about 单曲/single songs).
+- **Empty queue** → equivalent to a normal play (nothing to preserve).
+- **FM mode** → `!play` still exits FM (manual takeover), but existing queued songs are preserved and continue after the single song (auto-refill stops because FM is off). Documented.
+
+---
+
+## Config
+
+Add to `BotConfig` (in `src/data/config.ts`), both **default false**, both sanitized on load exactly like `localAudioEnabled` / `autoPauseOnEmpty` (so a hand-edited / legacy / corrupt `config.json` can never silently enable them):
+
+```ts
+savedQueuesEnabled: boolean;  // default false — gates Features 1 & 2 (admin-controlled)
+playKeepsQueue: boolean;      // default false — independent (Feature 3)
+```
+
+- Set via **Settings → 行为设置** (the existing admin behavior-settings surface, written through `POST /api/bot/settings`).
+- When `savedQueuesEnabled` is false: chat save/load/queues reply "此功能未启用"; `/api/saved-queues/*` return 403/404; the WebUI page/nav is hidden; no snapshotting; no auto-restore.
+
+## Error handling & edge cases
+
+- Corrupt `songs` JSON blob → treated as empty list; never throws into a route or the restore path.
+- Save with a duplicate name → upsert (overwrite), not an error.
+- Load/delete of a non-owned private queue → 404.
+- Caps exceeded → 4xx with a clear message (web) / friendly reply (chat).
+- Snapshot writes are best-effort and debounced; a DB write failure logs and never interrupts playback.
+- Restore of a Spotify-containing queue → best-effort per source; failures skip to next (existing `resolveAndPlay` skip behavior).
+
+## Testing (TDD)
+
+- **DB:** `saveQueue` upsert + caps; `listSavedQueues` own vs shared; `getSavedQueue`/`deleteSavedQueue`; ownership; `queue_state` upsert/get/clear; JSON round-trip + corrupt-blob degradation.
+- **PlayQueue:** `snapshot`/`restore` round-trip (songs, index, mode; derived state consistent).
+- **BotInstance:** `!save`/`!load`/`!load -a`/`!queues`; feature-disabled replies; snapshot-on-stateChange (debounced); resume-on-ready; `playKeepsQueue` insert-and-jump vs clear; collections still replace; FM interaction.
+- **Web API:** auth + capability + feature-gate (403/404); save (own/shared); load replace/append; delete ownership; caps.
+- **Config:** defaults false; load sanitization (legacy/corrupt/non-boolean → false).
+- **Frontend:** Saved Queues page (save w/ shared toggle, load, append, delete, hidden when disabled); store/composable.
+- Then: full suite (`npx vitest run --no-file-parallelism`) + `npx tsc --noEmit` + `cd web && npm run build`.
+
+## Rollout / staging
+
+Implement in stages (each independently valuable, all default-off):
+
+1. **Config + gates** — `savedQueuesEnabled`, `playKeepsQueue`, sanitization, Settings UI.
+2. **Feature 3** — `playKeepsQueue` single-play behavior (small, self-contained).
+3. **Feature 1** — named save/load (DB → API → chat → WebUI page).
+4. **Feature 2** — live-queue snapshot + resume-on-restart.
+5. **Docs** — README (commands, toggles, caveats).

package.json

@@ -17,7 +17,7 @@
     "@discordjs/opus": "^0.10.0",
     "@honeybbq/teamspeak-client": "^0.2.1",
     "@koa/router": "^15.4.0",
-    "@sansenjian/qq-music-api": "^2.2.10",
+    "@sansenjian/qq-music-api": "~2.4.0",
     "axios": "^1.14.0",
     "bcryptjs": "^2.4.3",
     "better-sqlite3": "^12.8.0",
@@ -28,7 +28,7 @@
     "koa": "^3.2.0",
     "koa-bodyparser": "^4.4.1",
     "koa-static": "^5.0.0",
-    "NeteaseCloudMusicApi": "^4.30.0",
+    "NeteaseCloudMusicApi": "~4.32.0",
     "pino": "^10.3.1",
     "ts3-nodejs-library": "^3.5.1",
     "tweetnacl": "^1.0.3",
@@ -47,5 +47,13 @@
     "tsx": "^4.21.0",
     "typescript": "^6.0.2",
     "vitest": "^4.1.2"
+  },
+  "allowScripts": {
+    "@discordjs/opus@0.10.0": true,
+    "better-sqlite3@12.11.1": true,
+    "cpu-features@0.0.10": true,
+    "esbuild@0.28.1": true,
+    "ffmpeg-static@5.3.0": true,
+    "ssh2@1.17.0": true
   }
 }

src/audio/player.test.ts

@@ -1,8 +1,10 @@
-import { describe, it, expect } from "vitest";
+import { describe, it, expect, vi } from "vitest";
 import { mkdtempSync, writeFileSync, existsSync } from "node:fs";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
-import { buildFfmpegArgs, shouldUsePowerShellDownload, cleanupTempDir } from "./player.js";
+import { Readable } from "node:stream";
+import { buildFfmpegArgs, shouldUsePowerShellDownload, cleanupTempDir, shouldEndOnStall, volumeToFactor, AudioPlayer } from "./player.js";
+import type { Logger } from "../logger.js";
 
 function getHeadersArg(args: string[]): string {
   const idx = args.indexOf("-headers");
@@ -45,6 +47,14 @@ describe("buildFfmpegArgs", () => {
     expect(Number(args[idx + 1])).toBeGreaterThanOrEqual(30);
   });
 
+  it("sets -reconnect_at_eof 1 (before -i) so long B站 streams resume after premature EOF (#89)", () => {
+    const args = buildFfmpegArgs("https://x.bilivideo.com/audio.m4s", 0);
+    const idx = args.indexOf("-reconnect_at_eof");
+    expect(idx).toBeGreaterThan(-1);
+    expect(args[idx + 1]).toBe("1");
+    expect(idx).toBeLessThan(args.indexOf("-i")); // input options must precede -i
+  });
+
   it("inserts -ss before -i when seekSeconds > 0", () => {
     const args = buildFfmpegArgs("https://example.com/song.mp3", 42);
     const ssIdx = args.indexOf("-ss");
@@ -62,6 +72,7 @@ describe("buildFfmpegArgs", () => {
   it("omits HTTP-only flags when input is a local file path", () => {
     const args = buildFfmpegArgs("C:/temp/song.mp3", 0);
     expect(args).not.toContain("-reconnect");
+    expect(args).not.toContain("-reconnect_at_eof");
     expect(args).not.toContain("-reconnect_on_network_error");
     expect(args).not.toContain("-reconnect_on_http_error");
     expect(args).not.toContain("-headers");
@@ -80,6 +91,37 @@ describe("buildFfmpegArgs", () => {
   });
 });
 
+describe("volumeToFactor (#84 smooth volume curve)", () => {
+  it("is 0 at vol 0 and exactly 1.0 at vol 100 (full loudness still reserved at 100)", () => {
+    expect(volumeToFactor(0)).toBe(0);
+    expect(volumeToFactor(100)).toBe(1);
+  });
+
+  it("clamps out-of-range input", () => {
+    expect(volumeToFactor(-20)).toBe(0);
+    expect(volumeToFactor(150)).toBe(1);
+  });
+
+  it("is strictly monotonic across the whole range (no dead zone)", () => {
+    for (let v = 0; v < 100; v++) {
+      expect(volumeToFactor(v + 1)).toBeGreaterThan(volumeToFactor(v));
+    }
+  });
+
+  it("removes the old flat 80-99 dead zone", () => {
+    // Old mapping moved only 0.16 -> 0.198 across 80..99; new curve climbs clearly.
+    expect(volumeToFactor(99) - volumeToFactor(80)).toBeGreaterThan(0.3);
+  });
+
+  it("removes the discontinuity at 100 (old jump was ~0.8)", () => {
+    expect(volumeToFactor(100) - volumeToFactor(99)).toBeLessThan(0.1);
+  });
+
+  it("keeps the low range gentle", () => {
+    expect(volumeToFactor(50)).toBeLessThan(0.12);
+  });
+});
+
 describe("shouldUsePowerShellDownload", () => {
   const jdymusicUrl =
     "http://m801.music.126.net/20260507/abc/jdymusic/obj/xyz/song.mp3?vuutv=tok";
@@ -133,3 +175,486 @@ describe("cleanupTempDir", () => {
     expect(() => cleanupTempDir(dir)).not.toThrow();
   });
 });
+
+describe("shouldEndOnStall (#89 mid-track stall watchdog)", () => {
+  const MAX_EMPTY = 250; // ~5s near-end threshold
+  const MAX_STALL = 3000; // ~60s far-from-end watchdog
+
+  it("ends quickly near the end once the empty threshold is reached (normal EOF)", () => {
+    expect(shouldEndOnStall(MAX_EMPTY, true, MAX_EMPTY, MAX_STALL)).toBe(true);
+    expect(shouldEndOnStall(MAX_EMPTY - 1, true, MAX_EMPTY, MAX_STALL)).toBe(false);
+  });
+
+  it("does NOT end far from the end at the near-end threshold (avoids false skips on transient underruns)", () => {
+    // This is the core regression: a brief underrun mid-song must not end the track.
+    expect(shouldEndOnStall(MAX_EMPTY, false, MAX_EMPTY, MAX_STALL)).toBe(false);
+    expect(shouldEndOnStall(MAX_STALL - 1, false, MAX_EMPTY, MAX_STALL)).toBe(false);
+  });
+
+  it("eventually ends far from the end once the long stall watchdog trips (dead stream recovers)", () => {
+    // The pre-fix bug: far-from-end stalls grew unbounded and never ended -> permanent silence.
+    expect(shouldEndOnStall(MAX_STALL, false, MAX_EMPTY, MAX_STALL)).toBe(true);
+    expect(shouldEndOnStall(MAX_STALL + 500, false, MAX_EMPTY, MAX_STALL)).toBe(true);
+  });
+
+  it("never ends before any threshold", () => {
+    expect(shouldEndOnStall(0, true, MAX_EMPTY, MAX_STALL)).toBe(false);
+    expect(shouldEndOnStall(10, false, MAX_EMPTY, MAX_STALL)).toBe(false);
+  });
+});
+
+// Minimal stub: AudioPlayer only calls debug/info/warn/error; child() returns self.
+const silentLogger = {
+  debug() {},
+  info() {},
+  warn() {},
+  error() {},
+  fatal() {},
+  trace() {},
+  child() {
+    return silentLogger;
+  },
+} as unknown as Logger;
+
+function applyPlayerVolume(player: AudioPlayer, pcm: Buffer): Buffer {
+  return (
+    player as unknown as { applyVolume(input: Buffer): Buffer }
+  ).applyVolume(pcm);
+}
+
+function stereoPcm(sample: number, frames = 2): Buffer {
+  const pcm = Buffer.alloc(frames * 4);
+  for (let offset = 0; offset < pcm.length; offset += 2) {
+    pcm.writeInt16LE(sample, offset);
+  }
+  return pcm;
+}
+
+describe("AudioPlayer transient ducking gain", () => {
+  it("layers ducking on the PCM path without changing the user's base volume", () => {
+    const player = new AudioPlayer(silentLogger);
+    player.setVolume(100);
+    player.setDuckingGain(0.3);
+
+    const adjusted = applyPlayerVolume(player, stereoPcm(10_000));
+
+    expect(adjusted.readInt16LE(0)).toBe(3_000);
+    expect(adjusted.readInt16LE(2)).toBe(3_000);
+    expect(player.getVolume()).toBe(100);
+    expect(player.getDuckingGain()).toBe(0.3);
+  });
+
+  it("multiplies the transient gain by the existing base-volume curve", () => {
+    const player = new AudioPlayer(silentLogger);
+    player.setVolume(50);
+    player.setDuckingGain(0.5);
+
+    const adjusted = applyPlayerVolume(player, stereoPcm(10_000));
+    expect(adjusted.readInt16LE(0)).toBe(
+      Math.round(10_000 * volumeToFactor(50) * 0.5),
+    );
+  });
+
+  it("interpolates ramps smoothly across each stereo PCM frame", () => {
+    let now = 100;
+    const nowSpy = vi.spyOn(performance, "now").mockImplementation(() => now);
+    try {
+      const player = new AudioPlayer(silentLogger);
+      player.setVolume(100);
+      player.setDuckingGain(0.2, 100);
+
+      now = 150;
+      expect(player.getDuckingGain()).toBeCloseTo(0.6, 8);
+      const adjusted = applyPlayerVolume(player, stereoPcm(10_000));
+
+      // At t=150 the ramp is 0.6; at the end of this 20 ms frame it is 0.44.
+      expect(adjusted.readInt16LE(0)).toBe(6_000);
+      expect(adjusted.readInt16LE(2)).toBe(6_000);
+      expect(adjusted.readInt16LE(4)).toBe(4_400);
+      expect(adjusted.readInt16LE(6)).toBe(4_400);
+    } finally {
+      nowSpy.mockRestore();
+    }
+  });
+
+  it("clamps transient gain and ignores a non-finite update", () => {
+    const player = new AudioPlayer(silentLogger);
+    player.setDuckingGain(-1);
+    expect(player.getDuckingGain()).toBe(0);
+    player.setDuckingGain(2);
+    expect(player.getDuckingGain()).toBe(1);
+    player.setDuckingGain(Number.NaN);
+    expect(player.getDuckingGain()).toBe(1);
+  });
+});
+
+// A readable we fully control: no underlying source; we push PCM manually and
+// keep it open (never push(null)) to model the long-lived go-librespot sidecar.
+function openPcmReadable(): Readable {
+  return new Readable({ read() {} });
+}
+
+const wait = (ms: number): Promise<void> => new Promise<void>((r) => setTimeout(r, ms));
+const FRAME_BYTES = 3840; // PCM_FRAME_BYTES: 960 samples * 2ch * 2 bytes @48k s16le
+
+describe("AudioPlayer external-PCM mode (playPcmStream)", () => {
+  it("emits Opus 'frame' events from the external PCM stream without spawning ffmpeg", async () => {
+    const player = new AudioPlayer(silentLogger);
+    const frames: Buffer[] = [];
+    player.on("frame", (f) => frames.push(f));
+
+    const stream = openPcmReadable();
+    player.playPcmStream(stream, {});
+    stream.push(Buffer.alloc(FRAME_BYTES * 10)); // ~10 frames of PCM
+
+    await wait(150); // ~7 frame ticks at 20ms
+
+    expect(player.getState()).toBe("playing");
+    expect(frames.length).toBeGreaterThan(0);
+    expect(Buffer.isBuffer(frames[0])).toBe(true);
+    player.stop();
+  });
+
+  it("does NOT emit 'trackEnd' on underrun while external (stream stays open)", async () => {
+    const player = new AudioPlayer(silentLogger);
+    let ended = 0;
+    const frames: Buffer[] = [];
+    player.on("trackEnd", () => ended++);
+    player.on("frame", (f) => frames.push(f));
+
+    const stream = openPcmReadable();
+    player.playPcmStream(stream, {});
+    stream.push(Buffer.alloc(FRAME_BYTES * 2)); // only 2 frames, then underrun
+
+    await wait(200); // long after those 2 frames have drained
+
+    // In the url path, ffmpeg===null + empty buffer would fire trackEnd; here it must not.
+    expect(ended).toBe(0);
+    // Silence frames keep the 20ms timeline alive -> more than the 2 fed frames emitted.
+    expect(frames.length).toBeGreaterThan(2);
+    expect(player.getState()).toBe("playing");
+    player.stop();
+  });
+
+  // CORRECTION C2 (c): stop() DETACHES the shared readable — it must NOT be destroyed
+  // (destroying the sidecar's long-lived ffmpeg stdout would kill it for every future
+  // track). The sessionId bump + listener removal fence stale PCM out of pcmBuffer.
+  it("stop() detaches external mode without destroying the readable, and fences via sessionId", async () => {
+    const player = new AudioPlayer(silentLogger);
+    const frames: Buffer[] = [];
+    player.on("frame", (f) => frames.push(f));
+
+    const stream = openPcmReadable();
+    player.playPcmStream(stream, {});
+    expect(stream.listenerCount("data")).toBe(1);
+    stream.push(Buffer.alloc(FRAME_BYTES * 5));
+    await wait(80);
+
+    player.stop();
+    expect(player.getState()).toBe("idle");
+    // C2: the shared sidecar stream must NOT be destroyed by teardown.
+    expect(stream.destroyed).toBe(false);
+    // Player's listeners are removed on detach (data/end/error).
+    expect(stream.listenerCount("data")).toBe(0);
+    expect(stream.listenerCount("end")).toBe(0);
+    expect(stream.listenerCount("error")).toBe(0);
+
+    const countAtStop = frames.length;
+    // sessionId fence + detached listeners: PCM pushed after stop must not
+    // resurrect the timeline or re-feed pcmBuffer.
+    stream.push(Buffer.alloc(FRAME_BYTES * 5));
+    await wait(80);
+    expect(frames.length).toBe(countAtStop);
+  });
+
+  // CORRECTION C2 (a): a gapless track change is driven by the sidecar pushing LATER
+  // PCM over the SAME already-attached stream. The player must NOT detach/re-attach
+  // (no second playPcmStream) — one persistent data listener serves every track.
+  it("(C2-a) feeds a later chunk over the SAME single attachment — gapless track change, no re-attach", async () => {
+    const player = new AudioPlayer(silentLogger);
+    const frames: Buffer[] = [];
+    player.on("frame", (f) => frames.push(f));
+
+    const stream = openPcmReadable();
+    player.playPcmStream(stream, {});
+    expect(stream.listenerCount("data")).toBe(1); // attached exactly once
+
+    stream.push(Buffer.alloc(FRAME_BYTES * 4)); // "track 1" PCM
+    await wait(120);
+    const afterFirst = frames.length;
+    expect(afterFirst).toBeGreaterThan(0);
+
+    stream.push(Buffer.alloc(FRAME_BYTES * 4)); // sidecar seamlessly rolls into "track 2"
+    await wait(120);
+    expect(frames.length).toBeGreaterThan(afterFirst);
+
+    // Still exactly ONE listener — no detach/re-attach across the handoff.
+    expect(stream.listenerCount("data")).toBe(1);
+    expect(player.getState()).toBe("playing");
+    player.stop();
+  });
+
+  // CORRECTION C2 (b): a second playPcmStream detaches the first (NOT destroyed, and it
+  // stops feeding pcmBuffer) and attaches the second.
+  it("(C2-b) a second playPcmStream detaches the first (not destroyed, stops feeding) and attaches the second", async () => {
+    const player = new AudioPlayer(silentLogger);
+    const frames: Buffer[] = [];
+    player.on("frame", (f) => frames.push(f));
+
+    const first = openPcmReadable();
+    player.playPcmStream(first, {});
+    first.push(Buffer.alloc(FRAME_BYTES * 4));
+    await wait(120);
+    expect(frames.length).toBeGreaterThan(0);
+    expect(first.listenerCount("data")).toBe(1);
+
+    const second = openPcmReadable();
+    player.playPcmStream(second, {}); // fences + detaches `first`, attaches `second`
+
+    // C2: `first` is DETACHED, not destroyed.
+    expect(first.destroyed).toBe(false);
+    // `first` no longer feeds pcmBuffer — its data listener was removed.
+    expect(first.listenerCount("data")).toBe(0);
+    // `second` is now the attached source.
+    expect(second.listenerCount("data")).toBe(1);
+    expect(player.getState()).toBe("playing");
+    player.stop();
+  });
+
+  it("fires onExternalEnd when the readable ends (drives controller-based advance)", async () => {
+    const player = new AudioPlayer(silentLogger);
+    let endedCb = 0;
+
+    const stream = openPcmReadable();
+    player.playPcmStream(stream, { onExternalEnd: () => endedCb++ });
+    stream.push(Buffer.alloc(FRAME_BYTES));
+    await wait(40);
+    stream.push(null); // end-of-stream
+    await wait(40);
+
+    expect(endedCb).toBe(1);
+    player.stop();
+  });
+
+  it("seek() is a local no-op in external mode (never respawns ffmpeg on a spotify sentinel)", async () => {
+    const player = new AudioPlayer(silentLogger);
+    const stream = openPcmReadable();
+    player.playPcmStream(stream, {});
+    stream.push(Buffer.alloc(FRAME_BYTES * 3));
+    await wait(40);
+
+    expect(() => player.seek(30)).not.toThrow();
+    // Still external, still playing — no url-ffmpeg respawn, state unchanged.
+    expect(player.getState()).toBe("playing");
+    player.stop();
+  });
+
+  it("isExternalActive() is false initially, true after playPcmStream, false after stop()", () => {
+    const player = new AudioPlayer(silentLogger);
+    // Idle: never attached.
+    expect(player.isExternalActive()).toBe(false);
+
+    const stream = openPcmReadable();
+    player.playPcmStream(stream, {});
+    // Attached to the external sidecar stream.
+    expect(player.isExternalActive()).toBe(true);
+
+    player.stop();
+    // Detached again — the orchestrator uses this to know it must re-attach.
+    expect(player.isExternalActive()).toBe(false);
+  });
+
+  it("pause()/resume() still gate local emission in external mode (unchanged semantics)", async () => {
+    const player = new AudioPlayer(silentLogger);
+    const stream = openPcmReadable();
+    player.playPcmStream(stream, {});
+    stream.push(Buffer.alloc(FRAME_BYTES * 3));
+    await wait(40);
+
+    player.pause();
+    expect(player.getState()).toBe("paused");
+    player.resume();
+    expect(player.getState()).toBe("playing");
+    player.stop();
+  });
+
+  // CORRECTION C1 (whole-branch): mixed queue [spotifyA, neteaseB, spotifyC].
+  // Advancing A -> B (a NON-spotify track) calls stop(), whose detachExternalStream()
+  // PAUSES the backend's long-lived SHARED readable (state.flowing = false). When the
+  // LATER spotify track C reuses the SAME backend, the orchestrator re-attaches that
+  // SAME readable via playPcmStream(). Node's Readable.on('data') only auto-resumes
+  // when flowing !== false, so without an explicit resume() the shared stream stays
+  // paused, onData never fires, pcmBuffer stays empty, and C plays only silence frames.
+  // Regression: after re-attach the shared stream MUST be flowing again and real PCM
+  // MUST reach the player.
+  it("(C1) resumes a re-attached, previously-paused SHARED stream so a later Spotify track isn't silent", async () => {
+    const player = new AudioPlayer(silentLogger);
+    const frames: Buffer[] = [];
+    player.on("frame", (f) => frames.push(f));
+
+    // The backend's long-lived, SHARED readable, reused across every track.
+    const shared = openPcmReadable();
+
+    // --- Spotify track A: first attach (auto-resumes, flowing was null !== false).
+    player.playPcmStream(shared, {});
+    shared.push(Buffer.alloc(FRAME_BYTES * 4));
+    await wait(120);
+    expect(frames.length).toBeGreaterThan(0);
+
+    // --- Advance to a NON-spotify track (neteaseB): play(url) begins with stop(),
+    // which detaches AND pauses the shared stream (state.flowing = false).
+    player.stop();
+    expect(shared.isPaused()).toBe(true); // shared stream is now paused
+    expect(player.getState()).toBe("idle");
+
+    // --- Spotify track C reuses the SAME backend: isExternalActive() is false so the
+    // orchestrator re-attaches the SAME (paused) shared readable.
+    expect(player.isExternalActive()).toBe(false);
+
+    // Spy on the shared stream to observe whether real PCM actually flows to the
+    // player. Adding a 'data' listener while flowing===false does NOT resume it
+    // (Node semantics), so this spy cannot mask the bug — pre-fix it stays at 0.
+    let spyBytes = 0;
+    shared.on("data", (c: Buffer) => {
+      spyBytes += c.length;
+    });
+
+    player.playPcmStream(shared, {}); // re-attach the SAME shared readable
+
+    // The re-attached stream must be flowing again, or track C is silent.
+    expect(shared.isPaused()).toBe(false);
+
+    shared.push(Buffer.alloc(FRAME_BYTES * 4)); // "track C" PCM
+    await wait(120);
+
+    // onData must have run (real PCM reached the player), not just silence frames.
+    expect(spyBytes).toBeGreaterThan(0);
+    expect(player.getState()).toBe("playing");
+    player.stop();
+  });
+});
+
+// R3-4: the 20ms frame loop keeps running while paused (so a live-but-silent
+// stream can refill on resume). But the stall/EOF end-detection branches MUST
+// only run while state==="playing" — otherwise pausing a stalled or
+// unknown-duration stream still accumulates emptyFrameAttempts and auto-emits
+// trackEnd (~5s later), making the controller skip the paused track.
+//
+// These tests drive the real url-path frame loop (this.ffmpeg !== null, NOT
+// external mode), which cannot be exercised via playPcmStream (that sets
+// externalMode and suppresses both branches). We inject a fake live ffmpeg +
+// an empty pcmBuffer (a stream that stays alive but never yields a full PCM
+// frame) and run the actual startFrameLoop() under fake timers. `performance`
+// is faked in lockstep with the timer clock so each tick advances a real 20ms,
+// letting us cheaply cross MAX_EMPTY_ATTEMPTS (250 ticks ≈ 5s) deterministically.
+describe("AudioPlayer stall/EOF end-detection is gated on playing state (R3-4)", () => {
+  // Fake `performance` in lockstep with the timer clock so each advanced 20ms is
+  // a real frame tick (the loop computes its delay from performance.now()).
+  const FAKE_TIMER_OPTS: Parameters<typeof vi.useFakeTimers>[0] = {
+    toFake: ["setTimeout", "clearTimeout", "setInterval", "clearInterval", "Date", "performance"],
+  };
+
+  // A player primed as "playing" with a LIVE ffmpeg that never produces a full
+  // PCM frame (unknown duration -> isNearEnd forced true). startFrameLoop() runs
+  // the genuine loop; no real process is spawned (fake ffmpeg has no pid, so the
+  // end path never touches forceCleanup/process.kill).
+  function makeStalledPlaying(): AudioPlayer {
+    const player = new AudioPlayer(silentLogger);
+    const p = player as unknown as {
+      ffmpeg: unknown;
+      currentSongDuration: number;
+      pcmBuffer: Buffer;
+      emptyFrameAttempts: number;
+      framesPlayed: number;
+      state: string;
+      startFrameLoop(): void;
+    };
+    p.ffmpeg = { pid: undefined }; // live ffmpeg, but delivers no PCM
+    p.currentSongDuration = 0; // unknown duration -> isNearEnd === true
+    p.pcmBuffer = Buffer.alloc(0); // always < one PCM frame
+    p.emptyFrameAttempts = 0;
+    p.framesPlayed = 0;
+    p.state = "playing";
+    p.startFrameLoop();
+    return player;
+  }
+
+  it("does NOT emit trackEnd (and stays paused) when a stalled unknown-duration stream is paused past the stall threshold", () => {
+    vi.useFakeTimers(FAKE_TIMER_OPTS);
+    try {
+      const player = makeStalledPlaying();
+      let ended = 0;
+      player.on("trackEnd", () => ended++);
+
+      player.pause();
+      expect(player.getState()).toBe("paused");
+
+      // Advance well past MAX_EMPTY_ATTEMPTS (250 ticks ≈ 5s): ~300 ticks.
+      vi.advanceTimersByTime(20 * 300);
+
+      expect(ended).toBe(0);
+      expect(player.getState()).toBe("paused");
+      player.stop();
+    } finally {
+      vi.useRealTimers();
+    }
+  });
+
+  it("STILL emits trackEnd when the SAME stalled unknown-duration stream is left playing (dead-stream recovery #89 preserved)", () => {
+    vi.useFakeTimers(FAKE_TIMER_OPTS);
+    try {
+      const player = makeStalledPlaying(); // stays "playing"
+      let ended = 0;
+      player.on("trackEnd", () => ended++);
+
+      vi.advanceTimersByTime(20 * 300); // cross the 250-tick stall threshold
+
+      expect(ended).toBe(1);
+      expect(player.getState()).toBe("idle");
+      player.stop();
+    } finally {
+      vi.useRealTimers();
+    }
+  });
+
+  it("does not spuriously end after a brief pause+resume on a healthy stream", () => {
+    vi.useFakeTimers(FAKE_TIMER_OPTS);
+    try {
+      const player = new AudioPlayer(silentLogger);
+      const p = player as unknown as {
+        ffmpeg: unknown;
+        currentSongDuration: number;
+        pcmBuffer: Buffer;
+        emptyFrameAttempts: number;
+        framesPlayed: number;
+        state: string;
+        startFrameLoop(): void;
+      };
+      // Healthy: a live ffmpeg with a large buffered runway that never drains
+      // empty across the ticks below, so no underrun is ever seen.
+      p.ffmpeg = { pid: undefined };
+      p.currentSongDuration = 0;
+      p.pcmBuffer = Buffer.alloc(FRAME_BYTES * 400);
+      p.emptyFrameAttempts = 0;
+      p.framesPlayed = 0;
+      p.state = "playing";
+      p.startFrameLoop();
+
+      let ended = 0;
+      player.on("trackEnd", () => ended++);
+
+      vi.advanceTimersByTime(20 * 5); // play a few frames
+      player.pause();
+      vi.advanceTimersByTime(20 * 100); // brief pause (buffer NOT drained while paused)
+      player.resume();
+      expect(player.getState()).toBe("playing");
+      vi.advanceTimersByTime(20 * 100); // resume; still plenty of runway
+
+      expect(ended).toBe(0);
+      expect(player.getState()).toBe("playing");
+      player.stop();
+    } finally {
+      vi.useRealTimers();
+    }
+  });
+});

src/audio/player.ts

@@ -5,6 +5,7 @@ import { accessSync, chmodSync, constants, mkdtempSync, rmSync } from "node:fs";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
 import { createOpusEncoder, PCM_FRAME_BYTES, type Encoder } from "./encoder.js";
+import type { Readable } from "node:stream";
 import type { Logger } from "../logger.js";
 
 const require = createRequire(import.meta.url);
@@ -47,7 +48,7 @@ const resolvedFfmpeg: string = (() => {
   return "ffmpeg";
 })();
 
-function getFfmpegCommand(): string {
+export function getFfmpegCommand(): string {
   return resolvedFfmpeg;
 }
 
@@ -91,6 +92,11 @@ export function buildFfmpegArgs(url: string, seekSeconds: number): string[] {
   if (isHttp) {
     args.push(
       "-reconnect", "1",
+      // Long B站 streams sit on a CDN whose session/token can close the
+      // connection mid-file (premature EOF). Without this, FFmpeg treats that
+      // EOF as end-of-input and stops ~partway through (see #89); with it, it
+      // re-issues a Range request from the current offset to finish the stream.
+      "-reconnect_at_eof", "1",
       "-reconnect_streamed", "1",
       "-reconnect_delay_max", "30",
       "-reconnect_on_network_error", "1",
@@ -103,6 +109,43 @@ export function buildFfmpegArgs(url: string, seekSeconds: number): string[] {
   return args;
 }
 
+/**
+ * Decide whether to end the current track when FFmpeg is still alive but has
+ * produced no decodable audio for `emptyAttempts` consecutive frame ticks.
+ *
+ * - Near the song end we end quickly (`maxEmptyAttempts`): a normal EOF.
+ * - Far from the end we wait much longer (`maxStallAttempts`) before giving up,
+ *   so a transient buffer underrun on a healthy stream does NOT cause a false
+ *   skip — but a genuinely dead stream (e.g. a long B站 stream whose CDN session
+ *   expired mid-playback, #89) still recovers by advancing instead of going
+ *   permanently silent.
+ */
+export function shouldEndOnStall(
+  emptyAttempts: number,
+  isNearEnd: boolean,
+  maxEmptyAttempts: number,
+  maxStallAttempts: number,
+): boolean {
+  if (isNearEnd && emptyAttempts >= maxEmptyAttempts) return true;
+  if (emptyAttempts >= maxStallAttempts) return true;
+  return false;
+}
+
+/**
+ * Maps a 0-100 volume value to a linear PCM gain factor (#84).
+ *
+ * Continuous and strictly monotonic over [0,100]: 0 at vol 0 and exactly 1.0 at
+ * vol 100. The previous mapping was a two-piece step — gain = (vol/100)*0.2 for
+ * vol<100 (so the whole 0-99 range only spanned 0..0.198, making 80->99 feel
+ * flat) then a raw passthrough at vol===100 (a ~5x jump). This single curve keeps
+ * the low end gentle but ramps smoothly toward full loudness near the top, so the
+ * slider feels proportional with no dead zone and no discontinuity at 100.
+ */
+export function volumeToFactor(volume: number): number {
+  const x = Math.max(0, Math.min(100, volume)) / 100;
+  return 0.2 * x + 0.8 * Math.pow(x, 8);
+}
+
 export interface PlayerEvents {
   frame: (opusFrame: Buffer) => void;
   trackEnd: () => void;
@@ -118,6 +161,15 @@ export class AudioPlayer extends EventEmitter {
   private encoder: Encoder;
   private state: PlayerState = "idle";
   private volume = 75;
+  /**
+   * A transient gain envelope layered on top of the persisted user volume.
+   * Voice ducking drives this value; keeping it separate means a temporary
+   * attenuation can never leak into the saved volume setting.
+   */
+  private duckingRampStartGain = 1;
+  private duckingTargetGain = 1;
+  private duckingRampStartedAt = 0;
+  private duckingRampDurationMs = 0;
   private pcmBuffer: Buffer = Buffer.alloc(0);
   private logger: Logger;
   private frameLoopRunning = false;
@@ -138,8 +190,29 @@ export class AudioPlayer extends EventEmitter {
   private currentTempDir: string | null = null;
   private emptyFrameAttempts = 0;
   private static readonly MAX_EMPTY_ATTEMPTS = 250; // ~5秒的20ms帧循环（增加容错）
+  // Far-from-end stall watchdog (#89): if FFmpeg is alive but produces no audio
+  // for this many consecutive frame ticks (~60s at 20ms/frame), treat the stream
+  // as dead and advance instead of staying silent forever. Set high so a normal
+  // transient underrun never trips it.
+  private static readonly MAX_STALL_ATTEMPTS = 3000;
   private currentSongDuration = 0; // 当前歌曲总时长（秒）
 
+  // --- External PCM mode (Stage 2: go-librespot Spotify sidecar) ---
+  // When true, PCM arrives from a long-lived external Readable instead of a
+  // per-URL ffmpeg: this.ffmpeg stays null, and the underrun-driven trackEnd
+  // branches are suppressed (advance is driven by the controller, not EOF).
+  //
+  // CORRECTION C2: externalStream is the backend's LONG-LIVED, SHARED ffmpeg
+  // stdout (one stream reused across every track). Teardown must DETACH (remove
+  // the listeners we added + pause), never destroy it. We keep references to the
+  // exact handler functions so detach can removeListener precisely.
+  private externalMode = false;
+  private externalStream: Readable | null = null;
+  private onExternalEnd: (() => void) | null = null;
+  private externalDataHandler: ((chunk: Buffer) => void) | null = null;
+  private externalEndHandler: (() => void) | null = null;
+  private externalErrorHandler: ((err: Error) => void) | null = null;
+
   constructor(logger: Logger) {
     super();
     this.encoder = createOpusEncoder();
@@ -343,6 +416,117 @@ export class AudioPlayer extends EventEmitter {
     this.startFrameLoop();
   }
 
+  /**
+   * External-PCM mode (Stage 2 go-librespot Spotify sidecar).
+   *
+   * Feeds an already-normalized 48kHz/s16le/stereo PCM Readable (the
+   * go-librespot FIFO -> ffmpeg output) straight into the existing pcmBuffer +
+   * 20ms frame loop + Opus encoder + "frame" emission, WITHOUT spawning a
+   * per-URL ffmpeg. The url play() path is left completely untouched.
+   *
+   * Track advance is NOT driven by buffer underrun here (the sidecar stream is
+   * continuous and never EOFs per song); the caller drives advance via the
+   * SpotifyController "trackEnded" WebSocket event. onExternalEnd fires only if
+   * the underlying readable itself ends or errors.
+   *
+   * CORRECTION C2: the readable is the backend's long-lived, SHARED ffmpeg
+   * stdout reused across every track — a gapless track change is just LATER PCM
+   * on this SAME already-attached stream (no re-attach). Teardown DETACHES
+   * (removes our listeners + pauses); it never destroys the shared stream.
+   */
+  playPcmStream(readable: Readable, opts: { onExternalEnd?: () => void } = {}): void {
+    // 1. Fence current playback: stop() bumps sessionId, clears pcmBuffer, kills
+    //    any ffmpeg, and DETACHES (never destroys) any prior external stream.
+    this.stop();
+
+    const currentSessionId = this.sessionId;
+    this.externalMode = true;
+    this.externalStream = readable;
+    this.onExternalEnd = opts.onExternalEnd ?? null;
+    // Leave this.ffmpeg = null; clear currentUrl so seek() cannot respawn ffmpeg.
+    this.currentUrl = "";
+    this.seekOffset = 0;
+    this.framesPlayed = 0;
+    this.healthyFrames = 0;
+    this.ffmpegPaused = false;
+    this.spawnFailed = false;
+    this.emptyFrameAttempts = 0;
+    this.currentSongDuration = 0;
+
+    // Same ingestion + high-water backpressure as the ffmpeg.stdout handler,
+    // but pausing the Readable instead of ffmpeg.stdout. sessionId-guarded so
+    // stale sidecar PCM can't leak into a new track after stop()/skip. Handler
+    // refs are stored so detach can remove exactly these listeners (C2).
+    const onData = (chunk: Buffer): void => {
+      if (this.sessionId !== currentSessionId) return;
+      this.pcmBuffer = Buffer.concat([this.pcmBuffer, chunk]);
+      if (
+        this.pcmBuffer.length > AudioPlayer.BUFFER_HIGH_WATER &&
+        !this.ffmpegPaused &&
+        this.externalStream === readable
+      ) {
+        readable.pause();
+        this.ffmpegPaused = true;
+      }
+    };
+    const onEnd = (): void => {
+      if (this.sessionId !== currentSessionId) return;
+      this.onExternalEnd?.();
+    };
+    const onError = (err: Error): void => {
+      if (this.sessionId !== currentSessionId) return;
+      this.logger.warn({ err }, "External PCM stream error");
+      this.onExternalEnd?.();
+    };
+
+    this.externalDataHandler = onData;
+    this.externalEndHandler = onEnd;
+    this.externalErrorHandler = onError;
+
+    readable.on("data", onData);
+    readable.on("end", onEnd);
+    readable.on("error", onError);
+
+    // CORRECTION C1: explicitly resume a re-attached, previously-paused Readable.
+    // The backend's SHARED stdout is reused across every track; a prior non-spotify
+    // advance ran stop() -> detachExternalStream() which pause()d it (state.flowing =
+    // false). Node's Readable.on('data') only auto-resumes when flowing !== false, so
+    // re-attaching a paused stream would leave it stuck: onData never fires, pcmBuffer
+    // stays empty, and a later Spotify track plays only silence. resume() is safe/
+    // idempotent on a first attach (never-paused/already-flowing) stream.
+    readable.resume();
+
+    this.state = "playing";
+    this.startFrameLoop();
+  }
+
+  /**
+   * CORRECTION C2: DETACH, never destroy. The external readable is the backend's
+   * long-lived, SHARED ffmpeg stdout reused across every track; destroying it
+   * would kill the sidecar pipe for all future tracks. Remove only the listeners
+   * WE added and pause the flow so stale PCM stops landing in pcmBuffer, then
+   * clear the external-mode state.
+   */
+  private detachExternalStream(): void {
+    const stream = this.externalStream;
+    if (stream) {
+      if (this.externalDataHandler) stream.off("data", this.externalDataHandler);
+      if (this.externalEndHandler) stream.off("end", this.externalEndHandler);
+      if (this.externalErrorHandler) stream.off("error", this.externalErrorHandler);
+      try {
+        stream.pause();
+      } catch {
+        /* best-effort: never destroy the shared sidecar stream */
+      }
+    }
+    this.externalDataHandler = null;
+    this.externalEndHandler = null;
+    this.externalErrorHandler = null;
+    this.externalStream = null;
+    this.externalMode = false;
+    this.onExternalEnd = null;
+  }
+
   stop(): void {
     // 3. 递增 ID 是最有效的逻辑“隔离墙”
     this.sessionId++; 
@@ -372,6 +556,11 @@ export class AudioPlayer extends EventEmitter {
       this.currentTempDir = null;
     }
 
+    // CORRECTION C2: tear down external mode by DETACHING (remove our listeners +
+    // pause) — never destroy the shared, long-lived sidecar stream. The
+    // sessionId++ above already fences the external data/end/error handlers.
+    this.detachExternalStream();
+
     this.ffmpegPaused = false;
     this.spawnFailed = false;
     this.state = "idle";
@@ -433,34 +622,55 @@ export class AudioPlayer extends EventEmitter {
         ? (this.currentSongDuration - elapsed) <= 5 // 距离结尾不足5秒
         : true; // 未知时长时保守处理
       
-      if (this.ffmpeg !== null && this.pcmBuffer.length < PCM_FRAME_BYTES) {
+      // External mode: the sidecar PCM stream is continuous and never EOFs per
+      // song; a transient underrun must NOT end the track (advance is driven by
+      // the controller). Skip BOTH drain/stall branches while externalMode.
+      //
+      // R3-4: gate BOTH end-detection branches on state==="playing". While paused
+      // the loop still ticks (so a resumed stream can refill), but it must NOT
+      // accumulate stall attempts or emit trackEnd — otherwise pausing a stalled/
+      // unknown-duration stream would auto-advance ~5s later. Because the if is
+      // now false while paused, the else resets emptyFrameAttempts to 0, so a
+      // resumed healthy stream starts fresh and never ends instantly.
+      if (this.state === "playing" && !this.externalMode && this.ffmpeg !== null && this.pcmBuffer.length < PCM_FRAME_BYTES) {
         this.emptyFrameAttempts++;
         
-        // 只有同时满足：达到空帧阈值 + 接近结尾，才判定为播放结束
-        if (this.emptyFrameAttempts >= AudioPlayer.MAX_EMPTY_ATTEMPTS && isNearEnd) {
-          this.logger.info({ 
+        // End the track when FFmpeg has gone silent: quickly if we're near the
+        // end (normal EOF), or after a much longer stall window if we're not
+        // (a dead/expired stream — #89 — so playback recovers instead of going
+        // permanently silent).
+        if (
+          shouldEndOnStall(
+            this.emptyFrameAttempts,
+            isNearEnd,
+            AudioPlayer.MAX_EMPTY_ATTEMPTS,
+            AudioPlayer.MAX_STALL_ATTEMPTS,
+          )
+        ) {
+          this.logger.info({
             sessionId: this.sessionId,
             emptyAttempts: this.emptyFrameAttempts,
             bufferSize: this.pcmBuffer.length,
             elapsed: Math.round(elapsed),
             duration: this.currentSongDuration,
-            remaining: Math.round(this.currentSongDuration - elapsed)
-          }, "FFmpeg stopped outputting data near end, ending track");
+            remaining: Math.round(this.currentSongDuration - elapsed),
+            nearEnd: isNearEnd,
+          }, "FFmpeg stopped outputting data, ending track");
           this.frameLoopRunning = false;
-          if (this.state !== "idle") {
-            this.state = "idle";
-            // 清理FFmpeg进程
-            if (this.ffmpeg) {
-              const procToKill = this.ffmpeg;
-              const pidToKill = procToKill.pid;
-              this.ffmpeg = null;
-              if (pidToKill) {
-                this.forceCleanup(procToKill, pidToKill);
-              }
+          // The outer gate guarantees state==="playing" here, so no !=="idle"
+          // guard is needed: end the track directly.
+          this.state = "idle";
+          // 清理FFmpeg进程
+          if (this.ffmpeg) {
+            const procToKill = this.ffmpeg;
+            const pidToKill = procToKill.pid;
+            this.ffmpeg = null;
+            if (pidToKill) {
+              this.forceCleanup(procToKill, pidToKill);
             }
-            this.consecutiveFailures = 0;
-            this.emit("trackEnd");
           }
+          this.consecutiveFailures = 0;
+          this.emit("trackEnd");
           return;
         }
       } else {
@@ -468,14 +678,15 @@ export class AudioPlayer extends EventEmitter {
         this.emptyFrameAttempts = 0;
       }
 
-      if (!this.ffmpeg && this.pcmBuffer.length < PCM_FRAME_BYTES) {
+      // R3-4: likewise gated on state==="playing" — a drained/EOF'd stream must
+      // not emit trackEnd while paused; end-detection resumes on resume().
+      if (this.state === "playing" && !this.externalMode && !this.ffmpeg && this.pcmBuffer.length < PCM_FRAME_BYTES) {
         this.frameLoopRunning = false;
-        if (this.state !== "idle") {
-          this.state = "idle";
-          if (!this.spawnFailed) {
-            this.consecutiveFailures = 0;
-            this.emit("trackEnd");
-          }
+        // Outer gate guarantees state==="playing"; end directly (no !=="idle" guard).
+        this.state = "idle";
+        if (!this.spawnFailed) {
+          this.consecutiveFailures = 0;
+          this.emit("trackEnd");
         }
         return;
       }
@@ -484,13 +695,24 @@ export class AudioPlayer extends EventEmitter {
   }
 
   private sendNextFrame(): void {
-    if (this.pcmBuffer.length < PCM_FRAME_BYTES) return;
+    if (this.pcmBuffer.length < PCM_FRAME_BYTES) {
+      // External mode: the sidecar PCM stream is long-lived and must NOT end on
+      // a transient underrun. Emit an encoded silence frame so the 20ms voice
+      // timeline stays continuous instead of returning (which would desync TS).
+      if (this.externalMode) this.emitSilenceFrame();
+      return;
+    }
     const pcmFrame = this.pcmBuffer.subarray(0, PCM_FRAME_BYTES);
     this.pcmBuffer = this.pcmBuffer.subarray(PCM_FRAME_BYTES);
 
-    if (this.ffmpegPaused && this.pcmBuffer.length < AudioPlayer.BUFFER_LOW_WATER && this.ffmpeg?.stdout) {
-      this.ffmpeg.stdout.resume();
-      this.ffmpegPaused = false;
+    if (this.ffmpegPaused && this.pcmBuffer.length < AudioPlayer.BUFFER_LOW_WATER) {
+      if (this.externalMode && this.externalStream) {
+        this.externalStream.resume();
+        this.ffmpegPaused = false;
+      } else if (this.ffmpeg?.stdout) {
+        this.ffmpeg.stdout.resume();
+        this.ffmpegPaused = false;
+      }
     }
 
     try {
@@ -508,19 +730,75 @@ export class AudioPlayer extends EventEmitter {
     }
   }
 
+  private emitSilenceFrame(): void {
+    try {
+      const opusFrame = this.encoder.encode(Buffer.alloc(PCM_FRAME_BYTES));
+      this.emit("frame", opusFrame);
+      this.framesPlayed++;
+    } catch (err) {
+      this.emit("error", err as Error);
+    }
+  }
+
   private applyVolume(pcm: Buffer): Buffer {
-    if (this.volume === 100) return Buffer.from(pcm);
-    const factor = (this.volume / 100) * 0.2;
+    const baseFactor = volumeToFactor(this.volume);
+    const now = performance.now();
+    const startDuckingGain = this.duckingGainAt(now);
+    const endDuckingGain = this.duckingGainAt(now + FRAME_DURATION_MS);
+    const startFactor = baseFactor * startDuckingGain;
+    const endFactor = baseFactor * endDuckingGain;
+
+    if (startFactor >= 1 && endFactor >= 1) {
+      return Buffer.from(pcm);
+    }
+
     const out = Buffer.alloc(pcm.length);
+    // Most frames are outside the short attack/release windows. Preserve the
+    // old constant-factor hot path instead of doing interpolation per sample.
+    if (startFactor === endFactor) {
+      for (let i = 0; i < pcm.length; i += 2) {
+        const sample = Math.round(pcm.readInt16LE(i) * startFactor);
+        out.writeInt16LE(Math.max(-32768, Math.min(32767, sample)), i);
+      }
+      return out;
+    }
+
+    // PCM is fixed at stereo s16le. Use one gain for each L/R pair so a ramp
+    // never creates a tiny channel imbalance, and span the whole 20 ms frame.
+    const stereoFrames = Math.max(1, Math.ceil(pcm.length / 4));
     for (let i = 0; i < pcm.length; i += 2) {
-      let sample = Math.round(pcm.readInt16LE(i) * factor);
+      const frameIndex = Math.floor(i / 4);
+      const progress = stereoFrames === 1 ? 0 : frameIndex / (stereoFrames - 1);
+      const factor = startFactor + (endFactor - startFactor) * progress;
+      const sample = Math.round(pcm.readInt16LE(i) * factor);
       out.writeInt16LE(Math.max(-32768, Math.min(32767, sample)), i);
     }
     return out;
   }
 
+  private duckingGainAt(at: number): number {
+    if (this.duckingRampDurationMs <= 0) return this.duckingTargetGain;
+
+    const progress = Math.max(
+      0,
+      Math.min(1, (at - this.duckingRampStartedAt) / this.duckingRampDurationMs),
+    );
+    return (
+      this.duckingRampStartGain +
+      (this.duckingTargetGain - this.duckingRampStartGain) * progress
+    );
+  }
+
+  // NOTE: in external (Spotify sidecar) mode getElapsed() is frame-count based
+  // (framesPlayed includes silence frames emitted on underrun) and therefore
+  // only APPROXIMATE — the authoritative position is the controller's live
+  // status.track.position. This approximation is acceptable for Spotify.
   getElapsed(): number { return this.seekOffset + (this.framesPlayed * FRAME_DURATION_MS) / 1000; }
-  seek(seconds: number): void { 
+  seek(seconds: number): void {
+    // External (Spotify sidecar) mode: local seek is a no-op. Respawning ffmpeg
+    // on the spotify: sentinel would collide with the continuous PCM source;
+    // transport is delegated to the SpotifyController by the caller (Task 7).
+    if (this.externalMode) return;
     if (this.currentUrl && Number.isFinite(seconds) && seconds >= 0) {
       this.play(this.currentUrl, seconds, this.currentSongDuration);
     }
@@ -530,5 +808,25 @@ export class AudioPlayer extends EventEmitter {
   resetFailures(): void { this.consecutiveFailures = 0; }
   setVolume(vol: number): void { this.volume = Math.max(0, Math.min(100, vol)); }
   getVolume(): number { return this.volume; }
+  /** Set the temporary voice-ducking gain (0=silent, 1=unchanged). */
+  setDuckingGain(gain: number, rampMs = 0): void {
+    if (!Number.isFinite(gain)) return;
+
+    const now = performance.now();
+    const currentGain = this.duckingGainAt(now);
+    const targetGain = Math.max(0, Math.min(1, gain));
+    const duration = Number.isFinite(rampMs) ? Math.max(0, rampMs) : 0;
+
+    this.duckingRampStartGain = currentGain;
+    this.duckingTargetGain = targetGain;
+    this.duckingRampStartedAt = now;
+    this.duckingRampDurationMs =
+      duration > 0 && currentGain !== targetGain ? duration : 0;
+  }
+  getDuckingGain(): number { return this.duckingGainAt(performance.now()); }
   getState(): PlayerState { return this.state; }
-}
+  // True only while attached to an external (Spotify sidecar) PCM stream. Used
+  // by the orchestrator to decide whether to re-attach: stop() detaches (sets
+  // externalMode=false) so this is false after any player.stop().
+  isExternalActive(): boolean { return this.externalMode; }
+}

src/audio/queue.test.ts

@@ -484,4 +484,125 @@ describe("PlayQueue", () => {
       expect(promoted?.id).toBe("x");
     });
   });
+
+  // Issue #70: 随机循环 (rloop) used true random-with-replacement, so some
+  // songs repeated often while others were starved. It should behave like a
+  // shuffle bag (NetEase/QQ style): play every song once per cycle in random
+  // order, then reshuffle and continue, avoiding an immediate cross-cycle repeat.
+  describe("random-loop shuffle bag (issue #70)", () => {
+    it("plays every song exactly once per cycle before repeating", () => {
+      queue.setMode(PlayMode.RandomLoop);
+      const N = 12;
+      for (let i = 0; i < N; i++) queue.add(makeSong(`s${i}`));
+      queue.play();
+
+      const cycle1 = [queue.current()!.id];
+      for (let i = 0; i < N - 1; i++) cycle1.push(queue.next()!.id);
+      const cycle2: string[] = [];
+      for (let i = 0; i < N; i++) cycle2.push(queue.next()!.id);
+
+      // Each cycle is a full permutation of all N songs — zero repeats within
+      // a cycle, and both cycles cover the same complete set.
+      expect(new Set(cycle1).size).toBe(N);
+      expect(new Set(cycle2).size).toBe(N);
+      expect(new Set(cycle1)).toEqual(new Set(cycle2));
+    });
+
+    it("distributes plays evenly across songs over many cycles (no starvation)", () => {
+      queue.setMode(PlayMode.RandomLoop);
+      const N = 6;
+      const CYCLES = 20;
+      for (let i = 0; i < N; i++) queue.add(makeSong(`s${i}`));
+      queue.play();
+
+      const counts = new Map<string, number>();
+      counts.set(queue.current()!.id, 1);
+      for (let i = 0; i < CYCLES * N - 1; i++) {
+        const id = queue.next()!.id;
+        counts.set(id, (counts.get(id) ?? 0) + 1);
+      }
+
+      // Shuffle bag => each song plays exactly CYCLES times. True random
+      // would skew heavily.
+      for (let i = 0; i < N; i++) {
+        expect(counts.get(`s${i}`)).toBe(CYCLES);
+      }
+    });
+
+    it("does not replay the same song across a cycle boundary", () => {
+      queue.setMode(PlayMode.RandomLoop);
+      const N = 5;
+      for (let i = 0; i < N; i++) queue.add(makeSong(`s${i}`));
+      queue.play();
+
+      // Walk to the last song of cycle 1, then cross into cycle 2.
+      for (let i = 0; i < N - 1; i++) queue.next();
+      const lastOfCycle1 = queue.current()!.id;
+      const firstOfCycle2 = queue.next()!.id;
+      expect(firstOfCycle2).not.toBe(lastOfCycle1);
+    });
+
+    it("includes a song added mid-cycle within the current cycle", () => {
+      queue.setMode(PlayMode.RandomLoop);
+      queue.add(makeSong("A"));
+      queue.add(makeSong("B"));
+      queue.play(); // A
+      queue.next(); // B — both originals now played this cycle
+      queue.add(makeSong("C")); // added mid-cycle, still unplayed
+      // C is the only unplayed song, so it must come next (not a reshuffle).
+      expect(queue.next()?.id).toBe("C");
+    });
+
+    it("keeps looping forever with multiple songs (never returns null)", () => {
+      queue.setMode(PlayMode.RandomLoop);
+      queue.add(makeSong("A"));
+      queue.add(makeSong("B"));
+      queue.add(makeSong("C"));
+      queue.play();
+      for (let i = 0; i < 30; i++) {
+        expect(queue.next()).not.toBeNull();
+      }
+    });
+  });
+
+  describe("snapshot / restore (#119)", () => {
+    it("round-trips songs, index, and mode; strips url", () => {
+      const q = new PlayQueue();
+      q.add(makeSong("A"));
+      q.add(makeSong("B"));
+      q.setMode(PlayMode.Loop);
+      q.play();
+      q.next(); // current = index 1
+      const snap = q.snapshot();
+      expect(snap.currentIndex).toBe(1);
+      expect(snap.mode).toBe(PlayMode.Loop);
+      expect((snap.songs[0] as QueuedSong).url).toBeUndefined();
+      expect(snap.songs.map((s) => s.id)).toEqual(["A", "B"]);
+
+      const q2 = new PlayQueue();
+      q2.restore(snap);
+      expect(q2.list().map((s) => s.id)).toEqual(["A", "B"]);
+      expect(q2.getCurrentIndex()).toBe(1);
+      expect(q2.getMode()).toBe(PlayMode.Loop);
+      expect(q2.current()?.id).toBe("B");
+    });
+
+    it("preserves requestedBy through a snapshot", () => {
+      const q = new PlayQueue();
+      q.add({ ...makeSong("A"), requestedBy: "alice" });
+      q.play();
+      const q2 = new PlayQueue();
+      q2.restore(q.snapshot());
+      expect(q2.current()?.requestedBy).toBe("alice");
+    });
+
+    it("degrades an out-of-range index to -1 (nothing current)", () => {
+      const q = new PlayQueue();
+      const { url: _url, ...noUrl } = makeSong("A");
+      q.restore({ songs: [noUrl], currentIndex: 5, mode: PlayMode.Sequential });
+      expect(q.getCurrentIndex()).toBe(-1);
+      expect(q.current()).toBeNull();
+      expect(q.list().map((s) => s.id)).toEqual(["A"]);
+    });
+  });
 });

src/audio/queue.ts

@@ -10,10 +10,23 @@ export interface QueuedSong {
   name: string;
   artist: string;
   album: string;
-  platform: "netease" | "qq" | "bilibili" | "youtube";
+  platform: "netease" | "qq" | "bilibili" | "youtube" | "local" | "kugou" | "spotify" | "jellyfin";
   url?: string; // resolved lazily at play time
   coverUrl: string;
   duration: number; // seconds
+  requestedBy?: string;
+}
+
+/**
+ * A persistable view of a queue: its songs (minus the lazily-resolved `url`),
+ * the current index, and the play mode. Used to snapshot/restore the live queue
+ * across restarts (issue #119). Derived state (playedIndices/history/forward
+ * stack) is intentionally NOT captured — restore() rebuilds it consistently.
+ */
+export interface QueueSnapshot {
+  songs: Omit<QueuedSong, "url">[];
+  currentIndex: number;
+  mode: PlayMode;
 }
 
 export class PlayQueue {
@@ -155,33 +168,42 @@ export class PlayQueue {
             return this.songs[target];
           }
         }
-        // 前进栈为空，走纯随机逻辑
-        if (this.mode === PlayMode.Random) {
-          const unplayed: number[] = [];
-          for (let i = 0; i < this.songs.length; i++) {
-            if (!this.playedIndices.has(i)) unplayed.push(i);
-          }
-          if (unplayed.length === 0) return null;
-          const nextIndex =
-            unplayed[Math.floor(Math.random() * unplayed.length)];
-          this.pushHistory(this.currentIndex);
-          this.currentIndex = nextIndex;
-          this.playedIndices.add(nextIndex);
-          return this.songs[nextIndex];
-        } else {
+
+        // Shuffle bag: pick uniformly from the songs not yet played this
+        // cycle, so every song plays once before any repeats (NetEase/QQ
+        // style). Songs added mid-cycle aren't in playedIndices, so they're
+        // naturally eligible within the current cycle.
+        const unplayed: number[] = [];
+        for (let i = 0; i < this.songs.length; i++) {
+          if (!this.playedIndices.has(i)) unplayed.push(i);
+        }
+
+        if (unplayed.length === 0) {
+          // Cycle complete.
+          if (this.mode === PlayMode.Random) return null; // 随机：播完即停
+          // 随机循环：reshuffle and keep going forever.
           if (this.songs.length === 1) {
             this.pushHistory(this.currentIndex);
             this.currentIndex = 0;
+            this.playedIndices = new Set([0]);
             return this.songs[0];
           }
-          let idx: number;
-          do {
-            idx = Math.floor(Math.random() * this.songs.length);
-          } while (idx === this.currentIndex);
-          this.pushHistory(this.currentIndex);
-          this.currentIndex = idx;
-          return this.songs[idx];
+          // Start a fresh cycle: every song is eligible again, but exclude
+          // the song that just played from THIS pick only, so it doesn't
+          // repeat back-to-back across the boundary. It stays eligible for
+          // the rest of the new cycle, so every song still plays exactly once.
+          this.playedIndices = new Set();
+          for (let i = 0; i < this.songs.length; i++) {
+            if (i !== this.currentIndex) unplayed.push(i);
+          }
         }
+
+        const nextIndex =
+          unplayed[Math.floor(Math.random() * unplayed.length)];
+        this.pushHistory(this.currentIndex);
+        this.currentIndex = nextIndex;
+        this.playedIndices.add(nextIndex);
+        return this.songs[nextIndex];
       }
     }
   }
@@ -263,4 +285,32 @@ export class PlayQueue {
   unplayedCount(): number {
     return this.songs.length - this.playedIndices.size;
   }
+
+  /**
+   * Capture the queue as a persistable snapshot (songs minus `url`, current
+   * index, mode). Songs keep their `requestedBy` so restored play-history
+   * attribution stays correct. See restore().
+   */
+  snapshot(): QueueSnapshot {
+    return {
+      songs: this.songs.map(({ url: _url, ...s }) => s),
+      currentIndex: this.currentIndex,
+      mode: this.mode,
+    };
+  }
+
+  /**
+   * Replace the queue contents from a snapshot. Rebuilds the derived
+   * playedIndices/history/forwardStack to a clean, consistent state for the
+   * restored index (an out-of-range index degrades to -1 = "nothing current").
+   */
+  restore(s: QueueSnapshot): void {
+    this.songs = s.songs.map((song) => ({ ...song }));
+    this.mode = s.mode;
+    this.currentIndex =
+      s.currentIndex >= 0 && s.currentIndex < this.songs.length ? s.currentIndex : -1;
+    this.playedIndices = new Set(this.currentIndex >= 0 ? [this.currentIndex] : []);
+    this.history = [];
+    this.forwardStack = [];
+  }
 }

src/bot/auto-pause.test.ts

@@ -0,0 +1,73 @@
+import { describe, it, expect } from "vitest";
+import {
+  decideOccupancyAction,
+  occupancyFromClientList,
+  shouldResumeOnReturn,
+} from "./auto-pause.js";
+
+describe("decideOccupancyAction", () => {
+  it("pauses when empty while playing and enabled", () => {
+    expect(decideOccupancyAction("playing", false, true, 0)).toBe("pause");
+  });
+  it("does not pause when the feature is disabled", () => {
+    expect(decideOccupancyAction("playing", false, false, 0)).toBe("none");
+  });
+  it("does not pause when idle (nothing playing)", () => {
+    expect(decideOccupancyAction("idle", false, true, 0)).toBe("none");
+  });
+  it("does not pause when already paused", () => {
+    expect(decideOccupancyAction("paused", false, true, 0)).toBe("none");
+  });
+  it("resumes when re-populated and we auto-paused", () => {
+    expect(decideOccupancyAction("paused", true, true, 2)).toBe("resume");
+  });
+  it("does NOT resume a user-paused track on re-population", () => {
+    expect(decideOccupancyAction("paused", false, true, 2)).toBe("none");
+  });
+  it("does nothing when re-populated and already playing", () => {
+    expect(decideOccupancyAction("playing", false, true, 2)).toBe("none");
+  });
+  it("resume is independent of the enabled flag (we already auto-paused)", () => {
+    expect(decideOccupancyAction("paused", true, false, 1)).toBe("resume");
+  });
+});
+
+describe("occupancyFromClientList", () => {
+  it("returns null when the query failed (0 clients — bot itself is always present)", () => {
+    // This is the bug fix: a clientlist timeout makes getClientsInChannel()
+    // return [], which must be treated as "unknown", NOT as an empty channel.
+    expect(occupancyFromClientList(0)).toBeNull();
+  });
+  it("returns 0 other users when only the bot is in the channel", () => {
+    expect(occupancyFromClientList(1)).toBe(0);
+  });
+  it("excludes the bot itself from the count", () => {
+    expect(occupancyFromClientList(2)).toBe(1);
+    expect(occupancyFromClientList(5)).toBe(4);
+  });
+  it("never yields a negative count (guards the -1 that caused false pauses)", () => {
+    expect(occupancyFromClientList(-3)).toBeNull();
+  });
+});
+
+describe("shouldResumeOnReturn (event-driven auto-resume)", () => {
+  it("resumes when we auto-paused and are still paused", () => {
+    // The reported gap: someone returns after an auto-pause. clientlist can't
+    // confirm it (it times out while they're present), so we resume from the
+    // clientEnter event alone.
+    expect(shouldResumeOnReturn(true, "paused")).toBe(true);
+  });
+  it("does NOT resume a track the user paused by hand", () => {
+    expect(shouldResumeOnReturn(false, "paused")).toBe(false);
+  });
+  it("does nothing if already playing (e.g. the bot's own enter at connect)", () => {
+    // autoPaused is cleared to false on connect, so the bot's own clientEnter
+    // is a no-op; this also covers the playing/auto-paused-flag-stale case.
+    expect(shouldResumeOnReturn(false, "playing")).toBe(false);
+    expect(shouldResumeOnReturn(true, "playing")).toBe(false);
+  });
+  it("does nothing when idle (nothing to resume)", () => {
+    expect(shouldResumeOnReturn(true, "idle")).toBe(false);
+    expect(shouldResumeOnReturn(false, "idle")).toBe(false);
+  });
+});

src/bot/auto-pause.ts

@@ -0,0 +1,67 @@
+export type PlayerStateName = "idle" | "playing" | "paused";
+export type OccupancyAction = "pause" | "resume" | "none";
+
+/**
+ * Convert a channel client-list length into the number of *other* users, or
+ * `null` when occupancy can't be determined.
+ *
+ * A connected bot is always a member of its own channel, so a valid query
+ * returns at least 1 (the bot itself). A length of 0 therefore does NOT mean
+ * "empty channel" — it means the underlying `clientlist` query failed (e.g. the
+ * full-client `clientlist` command times out when other clients are present,
+ * and `getClientsInChannel()` returns `[]` on error). Treating that failure as
+ * "empty" is what caused playback to auto-pause within seconds whenever a
+ * listener was actually in the channel. When the result is indeterminate we
+ * return `null` so callers skip the auto-pause/idle decision entirely rather
+ * than mis-reading an unknown state as empty.
+ */
+export function occupancyFromClientList(clientCount: number): number | null {
+  if (clientCount <= 0) return null; // query failed → occupancy unknown
+  return clientCount - 1; // exclude the bot itself
+}
+
+/**
+ * Decide what auto-pause should do given channel occupancy.
+ * - empty (userCount <= 0): pause iff enabled and currently playing.
+ * - re-populated (userCount > 0): resume iff we previously auto-paused and are still paused.
+ * `autoPaused` distinguishes our auto-pause from a user pause, so user pauses are never resumed.
+ */
+export function decideOccupancyAction(
+  playerState: PlayerStateName,
+  autoPaused: boolean,
+  enabled: boolean,
+  userCount: number,
+): OccupancyAction {
+  const empty = userCount <= 0;
+  if (empty) {
+    if (enabled && playerState === "playing") return "pause";
+    return "none";
+  }
+  if (autoPaused && playerState === "paused") return "resume";
+  return "none";
+}
+
+/**
+ * Whether a client-presence push event (a `clientEnter`) should trigger an
+ * auto-resume, WITHOUT consulting a clientlist query.
+ *
+ * Why event-driven: the full-client `clientlist`/`channellist` commands time
+ * out whenever ≥2 clients are connected to the server (a library limitation) —
+ * which is exactly the moment a listener returns. So occupancy cannot be
+ * re-queried to confirm the return; we must act on the push event itself.
+ * This is sound because the bot only ever auto-pauses while it is alone on the
+ * server (the sole state in which the occupancy query succeeds and pause
+ * fires). Therefore, while `autoPaused` is true, the only way occupancy can
+ * return is a fresh connection — delivered reliably as `clientEnter`.
+ *
+ * Gating on `autoPaused` (not merely "paused") guarantees we never revive a
+ * track the user paused by hand, and makes the bot's own `clientEnter` at
+ * connect a no-op (autoPaused is cleared to false on connect). This predicate
+ * NEVER pauses — pause stays on the authoritative clientlist path.
+ */
+export function shouldResumeOnReturn(
+  autoPaused: boolean,
+  playerState: PlayerStateName,
+): boolean {
+  return autoPaused && playerState === "paused";
+}

src/bot/commands.test.ts

@@ -1,5 +1,5 @@
 import { describe, it, expect } from "vitest";
-import { parseCommand } from "./commands.js";
+import { parseCommand, canRunCommand, isAdminCommand } from "./commands.js";
 
 describe("Command Parser", () => {
   it("parses simple command", () => {
@@ -60,3 +60,36 @@ describe("Command Parser", () => {
     expect(result!.args).toBe("3");
   });
 });
+
+describe("isAdminCommand classification", () => {
+  it("treats stop/clear/remove/move/vol/mode as admin", () => {
+    for (const c of ["stop", "clear", "remove", "move", "vol", "mode"]) {
+      expect(isAdminCommand(c)).toBe(true);
+    }
+  });
+  it("treats follow and play as NOT admin", () => {
+    expect(isAdminCommand("follow")).toBe(false);
+    expect(isAdminCommand("play")).toBe(false);
+  });
+});
+
+describe("canRunCommand", () => {
+  it("allows any public command regardless of groups", () => {
+    expect(canRunCommand("play", [], [6])).toBe(true);
+    expect(canRunCommand("follow", [], [6])).toBe(true);
+  });
+  it("allows admin command when enforcement is off (empty adminGroups)", () => {
+    expect(canRunCommand("stop", [], [])).toBe(true);
+  });
+  it("allows admin command when an invoker group matches (string vs number)", () => {
+    expect(canRunCommand("stop", ["6"], [6])).toBe(true);
+    expect(canRunCommand("stop", [6], [6])).toBe(true);
+    expect(canRunCommand("vol", ["8", "6"], [6])).toBe(true);
+  });
+  it("denies admin command when no invoker group matches", () => {
+    expect(canRunCommand("stop", ["8"], [6])).toBe(false);
+  });
+  it("denies admin command when invoker has no groups and enforcement is on", () => {
+    expect(canRunCommand("clear", [], [6])).toBe(false);
+  });
+});

src/bot/commands.ts

@@ -5,14 +5,13 @@ export interface ParsedCommand {
   flags: Set<string>;
 }
 
-export const PUBLIC_COMMANDS = new Set([
-  "play", "add", "queue", "list", "now", "lyrics", "vote", "help",
-  "playlist", "album", "fm", "prev", "next", "skip", "pause", "resume",
-  "artist",
-]);
-
+/**
+ * The fixed set of "admin" chat commands. This is the SINGLE source of truth
+ * for which commands the permission gate restricts; reclassifying a command is
+ * a one-line edit here. Everything not in this set is public.
+ */
 export const ADMIN_COMMANDS = new Set([
-  "stop", "clear", "move", "vol", "mode", "follow", "remove",
+  "stop", "clear", "remove", "move", "vol", "mode",
 ]);
 
 export function parseCommand(
@@ -59,3 +58,24 @@ export function parseCommand(
 export function isAdminCommand(commandName: string): boolean {
   return ADMIN_COMMANDS.has(commandName);
 }
+
+/**
+ * Decide whether a chat command may run, given the invoker's TS server groups
+ * and the configured admin groups. Pure + synchronous so it is trivially unit
+ * tested and reused by the async gate in BotInstance.
+ *
+ * Allowed iff: (1) it is a public command, OR (2) enforcement is off
+ * (adminGroups empty), OR (3) some invoker group is in adminGroups.
+ * invokerGroups (strings from TS) and adminGroups (numbers) are normalized to
+ * strings before comparison so "6" matches 6.
+ */
+export function canRunCommand(
+  commandName: string,
+  invokerGroups: readonly (string | number)[],
+  adminGroups: readonly number[],
+): boolean {
+  if (!isAdminCommand(commandName)) return true;
+  if (adminGroups.length === 0) return true;
+  const admin = new Set(adminGroups.map((g) => String(g)));
+  return invokerGroups.some((g) => admin.has(String(g)));
+}

src/bot/managed-voice-clients.test.ts

@@ -0,0 +1,181 @@
+import { describe, expect, it } from "vitest";
+import {
+  ManagedVoiceClientRegistry,
+  normalizeManagedVoiceClientScope,
+  normalizeManagedVoiceHost,
+} from "./managed-voice-clients.js";
+
+describe("managed voice client scope normalization", () => {
+  it("normalizes DNS host casing, whitespace, and trailing root dots", () => {
+    expect(normalizeManagedVoiceHost("  Voice.Example.COM...  ")).toBe(
+      "voice.example.com",
+    );
+    expect(
+      normalizeManagedVoiceClientScope({
+        host: "VOICE.EXAMPLE.COM.",
+        voicePort: 9987,
+      }),
+    ).toEqual({ host: "voice.example.com", voicePort: 9987 });
+  });
+
+  it("treats bracketed and equivalent expanded IPv6 literals as one host", () => {
+    expect(normalizeManagedVoiceHost("[2001:0DB8:0:0:0:0:0:1]")).toBe(
+      "2001:db8::1",
+    );
+    expect(normalizeManagedVoiceHost("2001:db8::1")).toBe("2001:db8::1");
+  });
+
+  it("rejects empty hosts and invalid voice ports", () => {
+    expect(
+      normalizeManagedVoiceClientScope({ host: " . ", voicePort: 9987 }),
+    ).toBeNull();
+    expect(
+      normalizeManagedVoiceClientScope({ host: "example.com", voicePort: 0 }),
+    ).toBeNull();
+    expect(
+      normalizeManagedVoiceClientScope({
+        host: "example.com",
+        voicePort: 65_536,
+      }),
+    ).toBeNull();
+  });
+
+});
+
+describe("ManagedVoiceClientRegistry", () => {
+  it("finds clients through normalized forms of the same scope", () => {
+    const registry = new ManagedVoiceClientRegistry();
+    const owner = Symbol("connection");
+
+    expect(
+      registry.register(
+        { host: " Voice.Example.COM. ", voicePort: 9987 },
+        42,
+        owner,
+      ),
+    ).toBe(true);
+    expect(
+      registry.has({ host: "voice.example.com", voicePort: 9987 }, 42),
+    ).toBe(true);
+  });
+
+  it("keeps different voice ports and hosts in separate scopes", () => {
+    const registry = new ManagedVoiceClientRegistry();
+    registry.register(
+      { host: "voice.example.com", voicePort: 9987 },
+      7,
+      Symbol("connection"),
+    );
+
+    expect(
+      registry.has({ host: "voice.example.com", voicePort: 9988 }, 7),
+    ).toBe(false);
+    expect(
+      registry.has({ host: "other.example.com", voicePort: 9987 }, 7),
+    ).toBe(false);
+  });
+
+  it("finds a managed bot by stable client UID across network endpoints", () => {
+    const registry = new ManagedVoiceClientRegistry();
+    const owner = Symbol("connection");
+
+    registry.register(
+      { host: "127.0.0.1", voicePort: 9987 },
+      17,
+      owner,
+      "  managed-client-uid=  ",
+    );
+
+    expect(registry.hasClientUid("managed-client-uid=")).toBe(true);
+    expect(
+      registry.has({ host: "192.168.1.10", voicePort: 20_000 }, 17),
+    ).toBe(false);
+  });
+
+  it("keeps a shared managed UID until its last owner unregisters", () => {
+    const registry = new ManagedVoiceClientRegistry();
+    const scope = { host: "203.0.113.4", voicePort: 9987 };
+    const first = Symbol("first connection");
+    const second = Symbol("second connection");
+    registry.register(scope, 18, first, "shared-client-uid=");
+    registry.register(scope, 19, second, "shared-client-uid=");
+
+    expect(registry.unregister(scope, 18, first, "shared-client-uid=")).toBe(true);
+    expect(registry.hasClientUid("shared-client-uid=")).toBe(true);
+    expect(registry.unregister(scope, 19, second, "shared-client-uid=")).toBe(true);
+    expect(registry.hasClientUid("shared-client-uid=")).toBe(false);
+  });
+
+  it("ignores missing or empty client UIDs", () => {
+    const registry = new ManagedVoiceClientRegistry();
+    registry.register(
+      { host: "203.0.113.4", voicePort: 9987 },
+      19,
+      Symbol("connection"),
+      "   ",
+    );
+
+    expect(registry.hasClientUid(undefined)).toBe(false);
+    expect(registry.hasClientUid("   ")).toBe(false);
+  });
+
+  it("uses an IPv6-safe scope key", () => {
+    const registry = new ManagedVoiceClientRegistry();
+    registry.register(
+      { host: "[2001:0db8:0:0:0:0:0:1]", voicePort: 9987 },
+      9,
+      Symbol("connection"),
+    );
+
+    expect(
+      registry.has({ host: "2001:db8::1", voicePort: 9987 }, 9),
+    ).toBe(true);
+  });
+
+  it("does not let a delayed old disconnect remove a replacement", () => {
+    const registry = new ManagedVoiceClientRegistry();
+    const scope = { host: "voice.example.com", voicePort: 9987 };
+    const oldConnection = Symbol("old connection");
+    const newConnection = Symbol("new connection");
+
+    registry.register(scope, 12, oldConnection, "managed-client-uid=");
+    registry.register(scope, 12, newConnection, "managed-client-uid=");
+
+    // The old UID owner is removed, but the replacement still owns both the
+    // scoped id and the shared stable UID.
+    expect(
+      registry.unregister(scope, 12, oldConnection, "managed-client-uid="),
+    ).toBe(true);
+    expect(registry.has(scope, 12)).toBe(true);
+    expect(registry.hasClientUid("managed-client-uid=")).toBe(true);
+    expect(
+      registry.unregister(scope, 12, newConnection, "managed-client-uid="),
+    ).toBe(true);
+    expect(registry.has(scope, 12)).toBe(false);
+    expect(registry.hasClientUid("managed-client-uid=")).toBe(false);
+  });
+
+  it.each([0, -1, 1.5, Number.NaN, Number.POSITIVE_INFINITY])(
+    "ignores invalid client id %s",
+    (clientId) => {
+      const registry = new ManagedVoiceClientRegistry();
+      const scope = { host: "voice.example.com", voicePort: 9987 };
+      const owner = Symbol("connection");
+
+      expect(registry.register(scope, clientId, owner)).toBe(false);
+      expect(registry.has(scope, clientId)).toBe(false);
+      expect(registry.unregister(scope, clientId, owner)).toBe(false);
+    },
+  );
+
+  it("has no shared module-level state between registry instances", () => {
+    const first = new ManagedVoiceClientRegistry();
+    const second = new ManagedVoiceClientRegistry();
+    const scope = { host: "voice.example.com", voicePort: 9987 };
+
+    first.register(scope, 3, Symbol("connection"));
+
+    expect(first.has(scope, 3)).toBe(true);
+    expect(second.has(scope, 3)).toBe(false);
+  });
+});

src/bot/managed-voice-clients.ts

@@ -0,0 +1,187 @@
+import { isIP } from "node:net";
+
+/** Identifies one TeamSpeak voice server. */
+export interface ManagedVoiceClientScope {
+  host: string;
+  voicePort: number;
+}
+
+export interface NormalizedManagedVoiceClientScope {
+  readonly host: string;
+  readonly voicePort: number;
+}
+
+/**
+ * An opaque value identifying the connection that owns a client id.
+ *
+ * A fresh object or Symbol per connection is recommended. Value tokens are
+ * also supported for callers that already have a unique connection id.
+ */
+export type ManagedVoiceClientOwnerToken = object | string | number | symbol;
+
+/**
+ * Normalize a TeamSpeak host for comparisons.
+ *
+ * DNS names are case-insensitive and may include a trailing root dot. IPv6
+ * literals may be supplied either bare or in URL-style brackets; valid IPv6
+ * addresses are also put into the canonical form produced by the URL parser.
+ */
+export function normalizeManagedVoiceHost(host: string): string {
+  let normalized = host.trim().toLowerCase().replace(/\.+$/, "");
+
+  if (normalized.startsWith("[") && normalized.endsWith("]")) {
+    normalized = normalized.slice(1, -1);
+  }
+
+  if (isIP(normalized) === 6) {
+    // URL's host serializer compresses equivalent IPv6 spellings. `isIP`
+    // ensures interpolation cannot be interpreted as another URL component.
+    const serialized = new URL(`http://[${normalized}]/`).hostname;
+    return serialized.slice(1, -1);
+  }
+
+  return normalized;
+}
+
+/** Return a comparable scope, or null when the runtime input is unusable. */
+export function normalizeManagedVoiceClientScope(
+  scope: ManagedVoiceClientScope,
+): NormalizedManagedVoiceClientScope | null {
+  if (
+    !scope ||
+    typeof scope.host !== "string" ||
+    typeof scope.voicePort !== "number"
+  ) {
+    return null;
+  }
+
+  const host = normalizeManagedVoiceHost(scope.host);
+  if (
+    host.length === 0 ||
+    !Number.isInteger(scope.voicePort) ||
+    scope.voicePort < 1 ||
+    scope.voicePort > 65_535
+  ) {
+    return null;
+  }
+
+  return { host, voicePort: scope.voicePort };
+}
+
+function scopeKey(scope: ManagedVoiceClientScope): string | null {
+  const normalized = normalizeManagedVoiceClientScope(scope);
+  if (!normalized) return null;
+
+  // A serialized tuple stays unambiguous when host itself contains colons.
+  return JSON.stringify([normalized.host, normalized.voicePort]);
+}
+
+function validClientId(clientId: number): boolean {
+  return Number.isSafeInteger(clientId) && clientId > 0;
+}
+
+function normalizeClientUid(clientUid: string | undefined): string | null {
+  if (typeof clientUid !== "string") return null;
+  const normalized = clientUid.trim();
+  return normalized.length > 0 ? normalized : null;
+}
+
+/**
+ * Tracks voice client ids and stable TeamSpeak identities owned by bot
+ * connections in this process. The UID path survives DNS aliases, NAT,
+ * multiple NICs, and dual-stack endpoints; scoped ids remain a fallback when
+ * a sender has not yet appeared in the receiving client's view cache.
+ *
+ * This class intentionally has no module-level singleton. BotManager owns one
+ * instance and injects it into its BotInstances so separate managers remain
+ * isolated in tests and in the same process.
+ */
+export class ManagedVoiceClientRegistry {
+  private readonly clientsByScope = new Map<
+    string,
+    Map<number, ManagedVoiceClientOwnerToken>
+  >();
+  private readonly ownersByClientUid = new Map<
+    string,
+    Set<ManagedVoiceClientOwnerToken>
+  >();
+
+  /**
+   * Register (or replace) the connection that owns a client id and, when
+   * available, add its stable UID to the managed set.
+   * Returns false when the scope or client id is invalid.
+   */
+  register(
+    scope: ManagedVoiceClientScope,
+    clientId: number,
+    ownerToken: ManagedVoiceClientOwnerToken,
+    clientUid?: string,
+  ): boolean {
+    const key = scopeKey(scope);
+    if (!key || !validClientId(clientId)) return false;
+
+    let clients = this.clientsByScope.get(key);
+    if (!clients) {
+      clients = new Map();
+      this.clientsByScope.set(key, clients);
+    }
+    clients.set(clientId, ownerToken);
+
+    const normalizedUid = normalizeClientUid(clientUid);
+    if (normalizedUid) {
+      let owners = this.ownersByClientUid.get(normalizedUid);
+      if (!owners) {
+        owners = new Set();
+        this.ownersByClientUid.set(normalizedUid, owners);
+      }
+      owners.add(ownerToken);
+    }
+    return true;
+  }
+
+  /**
+   * Remove a client only if it is still owned by this connection.
+   *
+   * The ownership check prevents a delayed disconnect from an old connection
+   * deleting a newer connection that reused the same TeamSpeak client id.
+   */
+  unregister(
+    scope: ManagedVoiceClientScope,
+    clientId: number,
+    ownerToken: ManagedVoiceClientOwnerToken,
+    clientUid?: string,
+  ): boolean {
+    const key = scopeKey(scope);
+    if (!key || !validClientId(clientId)) return false;
+
+    let removed = false;
+    const clients = this.clientsByScope.get(key);
+    if (clients?.get(clientId) === ownerToken) {
+      clients.delete(clientId);
+      if (clients.size === 0) this.clientsByScope.delete(key);
+      removed = true;
+    }
+
+    const normalizedUid = normalizeClientUid(clientUid);
+    if (normalizedUid) {
+      const owners = this.ownersByClientUid.get(normalizedUid);
+      if (owners?.delete(ownerToken)) removed = true;
+      if (owners?.size === 0) this.ownersByClientUid.delete(normalizedUid);
+    }
+    return removed;
+  }
+
+  has(scope: ManagedVoiceClientScope, clientId: number): boolean {
+    const key = scopeKey(scope);
+    if (!key || !validClientId(clientId)) return false;
+    return this.clientsByScope.get(key)?.has(clientId) ?? false;
+  }
+
+  /** TeamSpeak client UIDs are stable across endpoint aliases and NAT paths. */
+  hasClientUid(clientUid: string | undefined): boolean {
+    const normalizedUid = normalizeClientUid(clientUid);
+    return normalizedUid
+      ? (this.ownersByClientUid.get(normalizedUid)?.size ?? 0) > 0
+      : false;
+  }
+}

src/bot/manager.test.ts

@@ -0,0 +1,153 @@
+import { describe, it, expect, afterEach } from "vitest";
+import { join } from "node:path";
+import { mkdtempSync, rmSync } from "node:fs";
+import { tmpdir } from "node:os";
+import { BotManager } from "./manager.js";
+import { createDatabase, type BotDatabase } from "../data/database.js";
+import { createPermissionStore } from "../data/permissions.js";
+import { getDefaultConfig, loadConfig, saveConfig, type BotConfig } from "../data/config.js";
+import type { Logger } from "../logger.js";
+import type { MusicProvider } from "../music/provider.js";
+import type { AvatarStore } from "../data/avatars.js";
+import type { SpotifyOAuth } from "../music/spotify/spotify-oauth.js";
+
+// removeBot only calls logger.info; provide the full shape it could touch.
+const stubLogger = {
+  info() {},
+  warn() {},
+  error() {},
+  debug() {},
+  child() {
+    return stubLogger;
+  },
+} as unknown as Logger;
+
+describe("BotManager.removeBot — guest scope pruning", () => {
+  const dirs: string[] = [];
+  let db: BotDatabase;
+
+  function makeTmpConfigPath(): string {
+    const dir = mkdtempSync(join(tmpdir(), "tsmusicbot-manager-test-"));
+    dirs.push(dir);
+    return join(dir, "config.json");
+  }
+
+  function makeManager(config: BotConfig, configPath: string): BotManager {
+    db = createDatabase(":memory:");
+    const permissions = createPermissionStore(db.db);
+    saveConfig(configPath, config);
+    return new BotManager(
+      {} as unknown as MusicProvider,
+      {} as unknown as MusicProvider,
+      {} as unknown as MusicProvider,
+      db,
+      config,
+      stubLogger,
+      {} as unknown as AvatarStore,
+      permissions,
+      configPath
+    );
+  }
+
+  afterEach(() => {
+    try {
+      db?.close();
+    } catch {
+      /* ignore */
+    }
+    for (const d of dirs) {
+      rmSync(d, { recursive: true, force: true });
+    }
+    dirs.length = 0;
+  });
+
+  it("prunes a deleted bot from guestMode.bots (array) and persists", async () => {
+    const configPath = makeTmpConfigPath();
+    const config = getDefaultConfig();
+    config.guestMode.bots = ["botA", "botB"];
+    const manager = makeManager(config, configPath);
+
+    await manager.removeBot("botA");
+
+    expect(config.guestMode.bots).toEqual(["botB"]);
+    // Persisted file must also reflect the prune.
+    expect(loadConfig(configPath).guestMode.bots).toEqual(["botB"]);
+  });
+
+  it('leaves guestMode.bots === "all" unchanged (no crash, no change)', async () => {
+    const configPath = makeTmpConfigPath();
+    const config = getDefaultConfig();
+    config.guestMode.bots = "all";
+    const manager = makeManager(config, configPath);
+
+    await manager.removeBot("botA");
+
+    expect(config.guestMode.bots).toBe("all");
+    expect(loadConfig(configPath).guestMode.bots).toBe("all");
+  });
+});
+
+// --- Spotify OAuth threading (Task 6, C3.1) --------------------------------
+// The single process-wide SpotifyOAuth built in index.ts must reach every bot's
+// SpotifyController: index -> BotManager (trailing positional arg) -> BotInstance
+// -> controller. createBot() builds a REAL (side-effect-free) SpotifyController,
+// so we assert the shared instance surfaces via the controller's getOAuth().
+describe("BotManager — spotifyOAuth threading to bot controllers (C3.1)", () => {
+  const dirs: string[] = [];
+  let db: BotDatabase | undefined;
+
+  afterEach(() => {
+    try {
+      db?.close();
+    } catch {
+      /* ignore */
+    }
+    db = undefined;
+    for (const d of dirs) {
+      rmSync(d, { recursive: true, force: true });
+    }
+    dirs.length = 0;
+  });
+
+  it("forwards its shared SpotifyOAuth into a created bot's controller", async () => {
+    const dir = mkdtempSync(join(tmpdir(), "tsmusicbot-oauth-thread-"));
+    dirs.push(dir);
+    const configPath = join(dir, "config.json");
+    const config = getDefaultConfig();
+    saveConfig(configPath, config);
+    db = createDatabase(":memory:");
+    const permissions = createPermissionStore(db.db);
+    const provider = {} as unknown as MusicProvider;
+    const sentinel = {} as unknown as SpotifyOAuth;
+
+    const manager = new BotManager(
+      provider,
+      provider,
+      provider,
+      db,
+      config,
+      stubLogger,
+      {} as unknown as AvatarStore,
+      permissions,
+      configPath,
+      undefined, // localProvider
+      undefined, // kugouProvider
+      undefined, // spotifyProvider
+      join(dir, "spotify"), // spotifyDataDir
+      sentinel, // spotifyOAuth (the single shared instance)
+    );
+
+    const bot = await manager.createBot({
+      name: "b1",
+      serverAddress: "localhost",
+      serverPort: 9987,
+      nickname: "b1",
+    });
+
+    // Full chain observed: the manager's single shared instance is the exact
+    // one the per-bot controller now owns (getOAuth() returns it unchanged).
+    expect(bot.getSpotifyController().getOAuth()).toBe(sentinel);
+
+    bot.disconnect();
+  });
+});

src/bot/manager.ts

@@ -1,5 +1,6 @@
 import crypto from "node:crypto";
 import { EventEmitter } from "node:events";
+import path from "node:path";
 import {
   BotInstance,
   type BotInstanceOptions,
@@ -7,12 +8,14 @@ import {
 import type { MusicProvider } from "../music/provider.js";
 import { YouTubeProvider } from "../music/youtube.js";
 import type { BotDatabase } from "../data/database.js";
-import type { BotConfig } from "../data/config.js";
+import { saveConfig, type BotConfig } from "../data/config.js";
 import type { Logger } from "../logger.js";
 
 import type { ServerProtocol } from "../ts-protocol/client.js";
 import type { AvatarStore } from "../data/avatars.js";
 import type { PermissionStore } from "../data/permissions.js";
+import type { SpotifyOAuth } from "../music/spotify/spotify-oauth.js";
+import { ManagedVoiceClientRegistry } from "./managed-voice-clients.js";
 
 /**
  * Run bot.connect() with a hard deadline. If the handshake hangs (e.g. the
@@ -57,6 +60,7 @@ export interface CreateBotParams {
   queryPort?: number;
   nickname: string;
   defaultChannel?: string;
+  channelId?: string;
   channelPassword?: string;
   autoStart?: boolean;
   /** Force TS3 or TS6 protocol; omit or "unknown" for auto-detect. */
@@ -69,15 +73,23 @@ export interface CreateBotParams {
 
 export class BotManager extends EventEmitter {
   private bots = new Map<string, BotInstance>();
+  private readonly managedVoiceClients = new ManagedVoiceClientRegistry();
   private neteaseProvider: MusicProvider;
   private qqProvider: MusicProvider;
   private bilibiliProvider: MusicProvider;
   private youtubeProvider: MusicProvider;
+  private localProvider: MusicProvider;
+  private kugouProvider: MusicProvider;
+  private spotifyProvider: MusicProvider;
+  private jellyfinProvider: MusicProvider;
+  private spotifyDataDir: string;
+  private readonly spotifyOAuth?: SpotifyOAuth;
   private database: BotDatabase;
   private config: BotConfig;
   private logger: Logger;
   private avatarStore: AvatarStore;
   private permissions: PermissionStore;
+  private configPath: string;
 
   constructor(
     neteaseProvider: MusicProvider,
@@ -87,18 +99,38 @@ export class BotManager extends EventEmitter {
     config: BotConfig,
     logger: Logger,
     avatarStore: AvatarStore,
-    permissions: PermissionStore
+    permissions: PermissionStore,
+    configPath: string,
+    localProvider?: MusicProvider,
+    kugouProvider?: MusicProvider,
+    spotifyProvider?: MusicProvider,
+    spotifyDataDir?: string,
+    spotifyOAuth?: SpotifyOAuth,
+    jellyfinProvider?: MusicProvider
   ) {
     super();
     this.neteaseProvider = neteaseProvider;
     this.qqProvider = qqProvider;
     this.bilibiliProvider = bilibiliProvider;
     this.youtubeProvider = new YouTubeProvider();
+    this.localProvider = localProvider ?? neteaseProvider;
+    this.kugouProvider = kugouProvider ?? neteaseProvider;
+    this.spotifyProvider = spotifyProvider ?? neteaseProvider;
+    this.jellyfinProvider = jellyfinProvider ?? neteaseProvider;
+    this.spotifyDataDir = spotifyDataDir ?? path.join(process.cwd(), "data", "spotify");
+    this.spotifyOAuth = spotifyOAuth;
+    // Let the local provider see which uploads are still referenced by any
+    // bot's queue, so it never deletes a file another queue/bot still needs.
+    const referenceable = this.localProvider as Partial<{
+      setInUseResolver: (resolver: () => Set<string>) => void;
+    }>;
+    referenceable.setInUseResolver?.(() => this.getReferencedLocalSongIds());
     this.database = database;
     this.config = config;
     this.logger = logger;
     this.avatarStore = avatarStore;
     this.permissions = permissions;
+    this.configPath = configPath;
   }
 
   async createBot(params: CreateBotParams): Promise<BotInstance> {
@@ -113,6 +145,7 @@ export class BotManager extends EventEmitter {
         queryPort: params.queryPort ?? 10011,
         nickname: params.nickname,
         defaultChannel: params.defaultChannel,
+        channelId: params.channelId,
         channelPassword: params.channelPassword,
         serverPassword: params.serverPassword,
         serverProtocol: params.serverProtocol,
@@ -122,10 +155,17 @@ export class BotManager extends EventEmitter {
       qqProvider: this.qqProvider,
       bilibiliProvider: this.bilibiliProvider,
       youtubeProvider: this.youtubeProvider,
+      localProvider: this.localProvider,
+      kugouProvider: this.kugouProvider,
+      spotifyProvider: this.spotifyProvider,
+      jellyfinProvider: this.jellyfinProvider,
       database: this.database,
       config: this.config,
       logger: this.logger,
       avatarStore: this.avatarStore,
+      managedVoiceClients: this.managedVoiceClients,
+      spotifyDataDir: this.spotifyDataDir,
+      spotifyOAuth: this.spotifyOAuth,
     });
 
     this.bots.set(id, bot);
@@ -138,6 +178,7 @@ export class BotManager extends EventEmitter {
       serverPort: params.serverPort,
       nickname: params.nickname,
       defaultChannel: params.defaultChannel ?? "",
+      channelId: params.channelId ?? "",
       channelPassword: params.channelPassword ?? "",
       autoStart: params.autoStart ?? false,
       serverProtocol: params.serverProtocol ?? "",
@@ -157,6 +198,11 @@ export class BotManager extends EventEmitter {
     }
     this.database.deleteBotInstance(id);
     this.permissions.pruneBot(id);
+    // Prune the deleted bot from the guest scope allow-list (mirrors permissions.pruneBot).
+    if (Array.isArray(this.config.guestMode.bots) && this.config.guestMode.bots.includes(id)) {
+      this.config.guestMode.bots = this.config.guestMode.bots.filter((b) => b !== id);
+      saveConfig(this.configPath, this.config);
+    }
     this.emit("botInstanceRemoved", id);
     this.logger.info({ botId: id }, "Bot instance removed");
   }
@@ -173,6 +219,7 @@ export class BotManager extends EventEmitter {
       serverPort: params.serverPort ?? existing.serverPort,
       nickname: params.nickname ?? existing.nickname,
       defaultChannel: params.defaultChannel ?? existing.defaultChannel,
+      channelId: params.channelId ?? existing.channelId,
       channelPassword: params.channelPassword ?? existing.channelPassword,
       serverProtocol: params.serverProtocol ?? existing.serverProtocol,
       ts6ApiKey: params.ts6ApiKey ?? existing.ts6ApiKey,
@@ -198,6 +245,18 @@ export class BotManager extends EventEmitter {
     return Array.from(this.bots.values());
   }
 
+  /** Local upload ids still referenced by any bot's queue. The local provider
+   *  uses this to avoid deleting a file another queue/bot is still using. */
+  getReferencedLocalSongIds(): Set<string> {
+    const ids = new Set<string>();
+    for (const bot of this.bots.values()) {
+      for (const song of bot.getQueueManager().list()) {
+        if (song.platform === "local") ids.add(song.id);
+      }
+    }
+    return ids;
+  }
+
   async startBot(id: string): Promise<void> {
     const oldBot = this.bots.get(id);
     if (!oldBot) throw new Error(`Bot ${id} not found`);
@@ -231,6 +290,7 @@ export class BotManager extends EventEmitter {
           // each connect and strips all previously granted groups.
           identity: saved.identity || undefined,
           defaultChannel: saved.defaultChannel || undefined,
+          channelId: saved.channelId || undefined,
           channelPassword: saved.channelPassword || undefined,
           serverPassword: saved.serverPassword || undefined,
           serverProtocol: proto === "ts3" || proto === "ts6" ? proto : undefined,
@@ -240,10 +300,17 @@ export class BotManager extends EventEmitter {
         qqProvider: this.qqProvider,
         bilibiliProvider: this.bilibiliProvider,
         youtubeProvider: this.youtubeProvider,
+        localProvider: this.localProvider,
+        kugouProvider: this.kugouProvider,
+        spotifyProvider: this.spotifyProvider,
+        jellyfinProvider: this.jellyfinProvider,
         database: this.database,
         config: this.config,
         logger: this.logger,
         avatarStore: this.avatarStore,
+        managedVoiceClients: this.managedVoiceClients,
+        spotifyDataDir: this.spotifyDataDir,
+        spotifyOAuth: this.spotifyOAuth,
       });
       this.bots.set(id, bot);
       this.emit("botInstance", bot);
@@ -282,6 +349,7 @@ export class BotManager extends EventEmitter {
           nickname: saved.nickname,
           identity: saved.identity || undefined,
           defaultChannel: saved.defaultChannel || undefined,
+          channelId: saved.channelId || undefined,
           channelPassword: saved.channelPassword || undefined,
           serverPassword: saved.serverPassword || undefined,
           serverProtocol: proto === "ts3" || proto === "ts6" ? proto : undefined,
@@ -291,10 +359,17 @@ export class BotManager extends EventEmitter {
         qqProvider: this.qqProvider,
         bilibiliProvider: this.bilibiliProvider,
         youtubeProvider: this.youtubeProvider,
+        localProvider: this.localProvider,
+        kugouProvider: this.kugouProvider,
+        spotifyProvider: this.spotifyProvider,
+        jellyfinProvider: this.jellyfinProvider,
         database: this.database,
         config: this.config,
         logger: this.logger,
         avatarStore: this.avatarStore,
+        managedVoiceClients: this.managedVoiceClients,
+        spotifyDataDir: this.spotifyDataDir,
+        spotifyOAuth: this.spotifyOAuth,
       });
 
       this.bots.set(saved.id, bot);

src/bot/song-ref.test.ts

@@ -0,0 +1,69 @@
+import { describe, it, expect } from "vitest";
+import { parseSongRef, parseSelectionIndex } from "./song-ref.js";
+
+describe("parseSongRef (#90 exact-song selection)", () => {
+  it("returns null for a plain search term", () => {
+    expect(parseSongRef("Die For You")).toBeNull();
+    expect(parseSongRef("周杰伦 晴天")).toBeNull();
+    expect(parseSongRef("")).toBeNull();
+    // A bare number is NOT treated as an id (a song may be named "2002").
+    expect(parseSongRef("2002")).toBeNull();
+  });
+
+  it("parses an explicit id: prefix with no platform (defer to flags)", () => {
+    expect(parseSongRef("id:185868")).toEqual({ id: "185868", platform: null });
+    expect(parseSongRef("ID: 004Z8Ihr0JIu5s")).toEqual({ id: "004Z8Ihr0JIu5s", platform: null });
+  });
+
+  it("strips trailing punctuation from a pasted id:", () => {
+    expect(parseSongRef("id:185868.")).toEqual({ id: "185868", platform: null });
+    expect(parseSongRef("id:185868)")).toEqual({ id: "185868", platform: null });
+    expect(parseSongRef("id:185868,")).toEqual({ id: "185868", platform: null });
+  });
+
+  it("does NOT treat NetEase collection (playlist/album/artist) URLs as a song id", () => {
+    // These reuse ?id= but are not songs — they should fall through to search,
+    // not misresolve to getSongDetail(collectionId) and error "no song".
+    expect(parseSongRef("https://music.163.com/playlist?id=123456")).toBeNull();
+    expect(parseSongRef("https://music.163.com/#/playlist?id=123456")).toBeNull();
+    expect(parseSongRef("https://music.163.com/album?id=123456")).toBeNull();
+    expect(parseSongRef("https://music.163.com/artist?id=185858")).toBeNull();
+    // A genuine song URL is still parsed.
+    expect(parseSongRef("https://music.163.com/song?id=185868")).toEqual({ id: "185868", platform: "netease" });
+  });
+
+  it("parses NetEase song URLs", () => {
+    expect(parseSongRef("https://music.163.com/song?id=185868")).toEqual({ id: "185868", platform: "netease" });
+    expect(parseSongRef("https://music.163.com/#/song?id=185868&userid=1")).toEqual({ id: "185868", platform: "netease" });
+    expect(parseSongRef("music.163.com/song/185868")).toEqual({ id: "185868", platform: "netease" });
+  });
+
+  it("parses QQ song URLs", () => {
+    expect(parseSongRef("https://y.qq.com/n/ryqq/songDetail/004Z8Ihr0JIu5s")).toEqual({ id: "004Z8Ihr0JIu5s", platform: "qq" });
+    expect(parseSongRef("https://y.qq.com/n/yqq/song/abc.html?songmid=004Z8Ihr0JIu5s")).toEqual({ id: "004Z8Ihr0JIu5s", platform: "qq" });
+  });
+
+  it("parses BiliBili BV ids (bare or in a URL)", () => {
+    expect(parseSongRef("BV1yxHQeYEuE")).toEqual({ id: "BV1yxHQeYEuE", platform: "bilibili" });
+    expect(parseSongRef("https://www.bilibili.com/video/BV1yxHQeYEuE")).toEqual({ id: "BV1yxHQeYEuE", platform: "bilibili" });
+    expect(parseSongRef("https://b23.tv/BV1yxHQeYEuE")).toEqual({ id: "BV1yxHQeYEuE", platform: "bilibili" });
+  });
+});
+
+describe("parseSelectionIndex (#90 pick from last search)", () => {
+  it("parses #N tokens (1-based)", () => {
+    expect(parseSelectionIndex("#1")).toBe(1);
+    expect(parseSelectionIndex("#2")).toBe(2);
+    expect(parseSelectionIndex("# 3")).toBe(3);
+    expect(parseSelectionIndex("  #10  ")).toBe(10);
+  });
+
+  it("rejects non-selections", () => {
+    expect(parseSelectionIndex("2")).toBeNull();
+    expect(parseSelectionIndex("#0")).toBeNull();
+    expect(parseSelectionIndex("#-1")).toBeNull();
+    expect(parseSelectionIndex("Die For You")).toBeNull();
+    expect(parseSelectionIndex("#2 extra")).toBeNull();
+    expect(parseSelectionIndex("")).toBeNull();
+  });
+});

src/bot/song-ref.ts

@@ -0,0 +1,73 @@
+/**
+ * Parsing helpers for picking an EXACT song in a !play / !add / !playnext query,
+ * so same-name songs can be disambiguated instead of always getting the single
+ * most-popular search hit (issue #90).
+ *
+ * Two mechanisms:
+ *  - A song reference: an explicit id / platform URL → play that exact song.
+ *  - A selection index: "#N" → the Nth result of the previous !search.
+ */
+
+export interface SongRef {
+  id: string;
+  /**
+   * Platform inferred from a URL. `null` means the platform wasn't encoded in
+   * the reference (e.g. a bare `id:`), so the caller should fall back to the
+   * command's flags / default provider.
+   */
+  platform: "netease" | "qq" | "bilibili" | null;
+}
+
+/**
+ * Detect an explicit song reference in a query. Recognizes:
+ *   - `id:<id>`                         → platform from flags/default
+ *   - NetEase song URL                  → music.163.com/song?id=N (also /#/song?id=N, /song/N)
+ *   - QQ song URL                       → y.qq.com/.../songDetail/MID (or ?songmid=MID)
+ *   - BiliBili BVID (bare or in a URL)  → bilibili.com/video/BVxxxx, b23.tv, or BVxxxx
+ * Returns `null` for a plain search term (the common case).
+ */
+export function parseSongRef(raw: string): SongRef | null {
+  const q = (raw ?? "").trim();
+  if (!q) return null;
+
+  // Explicit "id:<id>" — platform decided by the command's flags/default.
+  // Strip trailing punctuation that tags along from a chat paste ("id:12345."
+  // / "id:12345)") — no supported id (numeric / BVID / mid) ends in those.
+  const idPrefix = /^id:\s*(\S+)$/i.exec(q);
+  if (idPrefix) return { id: idPrefix[1].replace(/[.,;)\]]+$/, ""), platform: null };
+
+  // BiliBili BV id, bare or inside a bilibili URL (NetEase ids are numeric, so
+  // a "BV..." token never collides with them).
+  const bv = /BV[0-9A-Za-z]{8,12}/.exec(q);
+  if (bv && (/^BV[0-9A-Za-z]{8,12}$/.test(q) || /bilibili\.com|b23\.tv/i.test(q))) {
+    return { id: bv[0], platform: "bilibili" };
+  }
+
+  // NetEase song URL. Only treat `id=N` as a SONG id when the URL is not a
+  // collection page (playlist/album/artist/toplist/djradio) — those reuse the
+  // same `id=` param but are NOT songs; getSongDetail() would 404 them into a
+  // confusing "no song" error instead of falling back to a normal search.
+  if (/music\.163\.com/i.test(q) && !/(playlist|album|artist|toplist|djradio)/i.test(q)) {
+    const m = /[?&#/]id=(\d+)/.exec(q) ?? /\/song\/(\d+)/.exec(q);
+    if (m) return { id: m[1], platform: "netease" };
+  }
+
+  // QQ song URL.
+  if (/y\.qq\.com/i.test(q)) {
+    const m = /songDetail\/([0-9A-Za-z]+)/.exec(q) ?? /[?&]songmid=([0-9A-Za-z]+)/i.exec(q);
+    if (m) return { id: m[1], platform: "qq" };
+  }
+
+  return null;
+}
+
+/**
+ * Detect a "#N" selection token (1-based) referencing the previous !search.
+ * Returns the positive integer, or `null` when the query isn't a selection.
+ */
+export function parseSelectionIndex(raw: string): number | null {
+  const m = /^#\s*(\d+)$/.exec((raw ?? "").trim());
+  if (!m) return null;
+  const n = parseInt(m[1], 10);
+  return Number.isFinite(n) && n > 0 ? n : null;
+}

src/bot/text-chunk.test.ts

@@ -0,0 +1,67 @@
+import { describe, it, expect } from "vitest";
+import { splitTextIntoChunks } from "./text-chunk.js";
+
+const bytes = (s: string) => Buffer.byteLength(s, "utf8");
+
+describe("splitTextIntoChunks", () => {
+  it("returns a single chunk for a short string", () => {
+    const chunks = splitTextIntoChunks("hello world", 900);
+    expect(chunks).toEqual(["hello world"]);
+  });
+
+  it("splits a multi-line string longer than maxBytes into multiple chunks on line boundaries", () => {
+    const lines = Array.from({ length: 50 }, (_, i) => `line number ${i}`);
+    const text = lines.join("\n");
+    const chunks = splitTextIntoChunks(text, 60);
+
+    expect(chunks.length).toBeGreaterThan(1);
+    for (const c of chunks) {
+      expect(bytes(c)).toBeLessThanOrEqual(60);
+    }
+    // No hard-split of any line occurred, so rejoining with "\n" is lossless.
+    expect(chunks.join("\n")).toBe(text);
+  });
+
+  it("bounds by BYTES not chars: multibyte (Chinese) content stays under the cap", () => {
+    // Each Chinese char is 3 bytes in UTF-8. 40 chars/line = 120 bytes/line.
+    const lines = Array.from({ length: 10 }, () => "歌词".repeat(20));
+    const text = lines.join("\n");
+    const chunks = splitTextIntoChunks(text, 150);
+
+    expect(chunks.length).toBeGreaterThan(1);
+    for (const c of chunks) {
+      expect(bytes(c)).toBeLessThanOrEqual(150);
+    }
+    expect(chunks.join("\n")).toBe(text);
+  });
+
+  it("hard-splits a single over-long line so no chunk exceeds the cap", () => {
+    const longLine = "a".repeat(500);
+    const chunks = splitTextIntoChunks(longLine, 100);
+
+    expect(chunks.length).toBeGreaterThan(1);
+    for (const c of chunks) {
+      expect(bytes(c)).toBeLessThanOrEqual(100);
+    }
+    // Content is preserved (hard-split introduces split points, not \n).
+    expect(chunks.join("")).toBe(longLine);
+  });
+
+  it("never splits a multibyte character across a hard-split boundary", () => {
+    // 200 Chinese chars = 600 bytes on ONE line, cap 40 bytes.
+    const longLine = "歌".repeat(200);
+    const chunks = splitTextIntoChunks(longLine, 40);
+
+    for (const c of chunks) {
+      expect(bytes(c)).toBeLessThanOrEqual(40);
+      // A clean re-decode: every chunk is valid UTF-8 with no replacement char.
+      expect(c.includes("�")).toBe(false);
+    }
+    expect(chunks.join("")).toBe(longLine);
+  });
+
+  it("preserves blank lines within a single chunk", () => {
+    const text = "a\n\nb";
+    expect(splitTextIntoChunks(text, 900)).toEqual([text]);
+  });
+});

src/bot/text-chunk.ts

@@ -0,0 +1,74 @@
+/**
+ * Split `text` into chunks whose UTF-8 byte length never exceeds `maxBytes`.
+ *
+ * TeamSpeak enforces a per-message byte cap (~1024 bytes), and the send path
+ * does no chunking, so a long single reply (e.g. full song lyrics) would be
+ * truncated or rejected. This packs whole lines greedily, breaking BETWEEN
+ * lines. When a single line is itself longer than `maxBytes`, it is hard-split
+ * on UTF-8 character boundaries so no chunk ever exceeds the cap and no
+ * multibyte character is ever cut in half.
+ *
+ * Content is preserved on rejoin, modulo the split points: chunks split only on
+ * newline boundaries rejoin losslessly with `chunks.join("\n")`; a hard-split
+ * long line rejoins with `chunks.join("")`.
+ *
+ * @param text     The full message text.
+ * @param maxBytes Max UTF-8 bytes per chunk (default 900 — under TS's ~1024 cap
+ *                 with headroom for protocol framing/escaping).
+ */
+export function splitTextIntoChunks(text: string, maxBytes = 900): string[] {
+  const chunks: string[] = [];
+  let current = "";
+
+  const flush = (): void => {
+    if (current !== "") {
+      chunks.push(current);
+      current = "";
+    }
+  };
+
+  for (const rawLine of text.split("\n")) {
+    const pieces =
+      Buffer.byteLength(rawLine, "utf8") > maxBytes
+        ? hardSplitByBytes(rawLine, maxBytes)
+        : [rawLine];
+
+    for (const piece of pieces) {
+      const candidate = current === "" ? piece : `${current}\n${piece}`;
+      if (Buffer.byteLength(candidate, "utf8") <= maxBytes) {
+        current = candidate;
+      } else {
+        // current is guaranteed non-empty here: pieces never exceed maxBytes,
+        // so an empty `current` always accepts the next piece above.
+        flush();
+        current = piece;
+      }
+    }
+  }
+
+  flush();
+  return chunks;
+}
+
+/**
+ * Break a single line into pieces each ≤ `maxBytes` UTF-8 bytes, never cutting
+ * a character (iterates code points, so surrogate pairs stay intact).
+ */
+function hardSplitByBytes(line: string, maxBytes: number): string[] {
+  const pieces: string[] = [];
+  let current = "";
+  let currentBytes = 0;
+
+  for (const ch of line) {
+    const chBytes = Buffer.byteLength(ch, "utf8");
+    if (currentBytes + chBytes > maxBytes && current !== "") {
+      pieces.push(current);
+      current = "";
+      currentBytes = 0;
+    }
+    current += ch;
+    currentBytes += chBytes;
+  }
+  if (current !== "") pieces.push(current);
+  return pieces;
+}

src/bot/voice-ducking.test.ts

@@ -0,0 +1,152 @@
+import { afterEach, describe, expect, it, vi } from "vitest";
+import { VoiceDuckingController } from "./voice-ducking.js";
+
+function makeHarness(
+  enabled = true,
+  volumePercent = 30,
+  timing = { attackMs: 50, holdMs: 100, releaseMs: 200 },
+) {
+  let now = 0;
+  const setDuckingGain = vi.fn<(gain: number, rampMs?: number) => void>();
+  const controller = new VoiceDuckingController(
+    { setDuckingGain },
+    { enabled, volumePercent },
+    { timing, now: () => now },
+  );
+
+  const advance = (milliseconds: number) => {
+    now += milliseconds;
+    vi.advanceTimersByTime(milliseconds);
+  };
+
+  return { controller, setDuckingGain, advance };
+}
+
+describe("VoiceDuckingController", () => {
+  afterEach(() => {
+    vi.useRealTimers();
+  });
+
+  it("is inert while disabled", () => {
+    vi.useFakeTimers();
+    const { controller, setDuckingGain, advance } = makeHarness(false);
+
+    controller.handleVoiceActivity(12);
+    advance(1_000);
+
+    expect(setDuckingGain).not.toHaveBeenCalled();
+    expect(controller.isDucking()).toBe(false);
+    expect(controller.activeSpeakerCount()).toBe(0);
+  });
+
+  it("attacks once, refreshes the packet deadline, then releases", () => {
+    vi.useFakeTimers();
+    const { controller, setDuckingGain, advance } = makeHarness();
+
+    controller.handleVoiceActivity(12);
+    expect(setDuckingGain).toHaveBeenCalledWith(0.3, 50);
+
+    advance(60);
+    controller.handleVoiceActivity(12);
+    expect(setDuckingGain).toHaveBeenCalledTimes(1);
+
+    // The original t=100 sweep observes the refreshed t=160 deadline.
+    advance(40);
+    expect(controller.isDucking()).toBe(true);
+    expect(setDuckingGain).toHaveBeenCalledTimes(1);
+
+    advance(60);
+    expect(controller.isDucking()).toBe(false);
+    expect(setDuckingGain).toHaveBeenLastCalledWith(1, 200);
+  });
+
+  it("stays ducked until the last overlapping speaker expires", () => {
+    vi.useFakeTimers();
+    const { controller, setDuckingGain, advance } = makeHarness();
+
+    controller.handleVoiceActivity(1);
+    advance(50);
+    controller.handleVoiceActivity(2);
+    advance(50);
+
+    expect(controller.activeSpeakerCount()).toBe(1);
+    expect(controller.isDucking()).toBe(true);
+    expect(setDuckingGain).toHaveBeenCalledTimes(1);
+
+    advance(50);
+    expect(controller.activeSpeakerCount()).toBe(0);
+    expect(setDuckingGain).toHaveBeenLastCalledWith(1, 200);
+  });
+
+  it("removes a client immediately on leave without disturbing other speakers", () => {
+    vi.useFakeTimers();
+    const { controller, setDuckingGain } = makeHarness();
+
+    controller.handleVoiceActivity(1);
+    controller.handleVoiceActivity(2);
+    controller.removeSpeaker(1);
+    expect(controller.isDucking()).toBe(true);
+    expect(controller.activeSpeakerCount()).toBe(1);
+
+    controller.removeSpeaker(2);
+    expect(controller.isDucking()).toBe(false);
+    expect(setDuckingGain).toHaveBeenLastCalledWith(1, 200);
+  });
+
+  it("retargets a live duck and smoothly restores when disabled", () => {
+    vi.useFakeTimers();
+    const { controller, setDuckingGain } = makeHarness();
+
+    controller.handleVoiceActivity(7);
+    controller.updateSettings({ enabled: true, volumePercent: 45 });
+    expect(setDuckingGain).toHaveBeenLastCalledWith(0.45, 50);
+
+    controller.updateSettings({ enabled: false, volumePercent: 45 });
+    expect(controller.isDucking()).toBe(false);
+    expect(controller.activeSpeakerCount()).toBe(0);
+    expect(setDuckingGain).toHaveBeenLastCalledWith(1, 200);
+  });
+
+  it("attacks again when speech resumes during the release window", () => {
+    vi.useFakeTimers();
+    const { controller, setDuckingGain, advance } = makeHarness();
+
+    controller.handleVoiceActivity(7);
+    advance(100);
+    expect(setDuckingGain).toHaveBeenLastCalledWith(1, 200);
+
+    advance(50);
+    controller.handleVoiceActivity(7);
+    expect(controller.isDucking()).toBe(true);
+    expect(setDuckingGain).toHaveBeenLastCalledWith(0.3, 50);
+  });
+
+  it("invalidates an old expiry callback after reset", () => {
+    vi.useFakeTimers();
+    const { controller, setDuckingGain, advance } = makeHarness();
+
+    controller.handleVoiceActivity(8);
+    controller.reset(true);
+    const callsAfterReset = setDuckingGain.mock.calls.length;
+    advance(1_000);
+
+    expect(setDuckingGain).toHaveBeenCalledTimes(callsAfterReset);
+    expect(setDuckingGain).toHaveBeenLastCalledWith(1, 0);
+  });
+
+  it("rejects invalid client ids and supports an immediate lifecycle reset", () => {
+    vi.useFakeTimers();
+    const { controller, setDuckingGain } = makeHarness();
+
+    for (const id of [0, -1, 1.5, Number.NaN]) {
+      controller.handleVoiceActivity(id);
+    }
+    expect(setDuckingGain).not.toHaveBeenCalled();
+
+    controller.handleVoiceActivity(8);
+    controller.reset(true);
+    expect(controller.isDucking()).toBe(false);
+    expect(controller.activeSpeakerCount()).toBe(0);
+    expect(setDuckingGain).toHaveBeenLastCalledWith(1, 0);
+  });
+});

src/bot/voice-ducking.ts

@@ -0,0 +1,183 @@
+export interface VoiceDuckingSettings {
+  enabled: boolean;
+  volumePercent: number;
+}
+
+export interface VoiceDuckingGainTarget {
+  setDuckingGain(gain: number, rampMs?: number): void;
+}
+
+export interface VoiceDuckingTiming {
+  attackMs: number;
+  holdMs: number;
+  releaseMs: number;
+}
+
+export const DEFAULT_VOICE_DUCKING_TIMING: Readonly<VoiceDuckingTiming> = {
+  attackMs: 50,
+  holdMs: 700,
+  releaseMs: 500,
+};
+
+interface VoiceDuckingControllerOptions {
+  timing?: Partial<VoiceDuckingTiming>;
+  now?: () => number;
+}
+
+function nonNegativeFinite(value: number | undefined, fallback: number): number {
+  return typeof value === "number" && Number.isFinite(value)
+    ? Math.max(0, value)
+    : fallback;
+}
+
+function normalizeSettings(settings: VoiceDuckingSettings): VoiceDuckingSettings {
+  return {
+    enabled: settings.enabled === true,
+    volumePercent:
+      typeof settings.volumePercent === "number" && Number.isFinite(settings.volumePercent)
+        ? Math.max(0, Math.min(100, settings.volumePercent))
+        : 30,
+  };
+}
+
+/**
+ * Converts the stream of incoming TeamSpeak voice packets into a stable
+ * ducking envelope. TeamSpeak's full-client protocol exposes voice packets,
+ * but not an explicit "stopped talking" event, so a speaker remains active
+ * for a short hold period after their most recent packet.
+ *
+ * Only one timeout is live at a time. Repeated ~20 ms voice packets update a
+ * deadline in the map instead of constantly destroying/recreating timers.
+ */
+export class VoiceDuckingController {
+  private settings: VoiceDuckingSettings;
+  private readonly timing: VoiceDuckingTiming;
+  private readonly now: () => number;
+  private readonly activeUntil = new Map<number, number>();
+  private expiryTimer: ReturnType<typeof setTimeout> | null = null;
+  private timerDueAt = Number.POSITIVE_INFINITY;
+  private timerGeneration = 0;
+  private ducking = false;
+
+  constructor(
+    private readonly target: VoiceDuckingGainTarget,
+    initialSettings: VoiceDuckingSettings,
+    options: VoiceDuckingControllerOptions = {},
+  ) {
+    this.settings = normalizeSettings(initialSettings);
+    this.timing = {
+      attackMs: nonNegativeFinite(options.timing?.attackMs, DEFAULT_VOICE_DUCKING_TIMING.attackMs),
+      holdMs: nonNegativeFinite(options.timing?.holdMs, DEFAULT_VOICE_DUCKING_TIMING.holdMs),
+      releaseMs: nonNegativeFinite(options.timing?.releaseMs, DEFAULT_VOICE_DUCKING_TIMING.releaseMs),
+    };
+    this.now = options.now ?? (() => performance.now());
+  }
+
+  handleVoiceActivity(clientId: number): void {
+    if (!this.settings.enabled || !Number.isInteger(clientId) || clientId <= 0) return;
+
+    const now = this.now();
+    this.activeUntil.set(clientId, now + this.timing.holdMs);
+
+    if (!this.ducking) {
+      this.ducking = true;
+      this.target.setDuckingGain(this.settings.volumePercent / 100, this.timing.attackMs);
+    }
+
+    this.scheduleNextSweep(now);
+  }
+
+  removeSpeaker(clientId: number): void {
+    if (!this.activeUntil.delete(clientId)) return;
+    if (this.activeUntil.size === 0) {
+      this.cancelTimer();
+      this.release();
+    }
+  }
+
+  updateSettings(settings: VoiceDuckingSettings): void {
+    const previous = this.settings;
+    this.settings = normalizeSettings(settings);
+
+    if (!this.settings.enabled) {
+      this.activeUntil.clear();
+      this.cancelTimer();
+      this.release();
+      return;
+    }
+
+    if (
+      previous.volumePercent !== this.settings.volumePercent &&
+      this.ducking
+    ) {
+      this.target.setDuckingGain(this.settings.volumePercent / 100, this.timing.attackMs);
+    }
+  }
+
+  /** Clear all activity. Disconnects use an immediate reset; disabling the
+   * feature uses updateSettings(), which returns smoothly over releaseMs. */
+  reset(immediate = true): void {
+    this.activeUntil.clear();
+    this.cancelTimer();
+    this.ducking = false;
+    this.target.setDuckingGain(1, immediate ? 0 : this.timing.releaseMs);
+  }
+
+  isDucking(): boolean {
+    return this.ducking;
+  }
+
+  activeSpeakerCount(): number {
+    return this.activeUntil.size;
+  }
+
+  private scheduleNextSweep(now = this.now()): void {
+    if (this.activeUntil.size === 0) return;
+
+    let nextDueAt = Number.POSITIVE_INFINITY;
+    for (const deadline of this.activeUntil.values()) {
+      if (deadline < nextDueAt) nextDueAt = deadline;
+    }
+
+    // Keeping an earlier timer is intentional. When it fires it will observe
+    // the refreshed deadline and schedule the remaining delay, avoiding timer
+    // churn on every incoming packet.
+    if (this.expiryTimer && this.timerDueAt <= nextDueAt) return;
+
+    this.cancelTimer();
+    const generation = ++this.timerGeneration;
+    this.timerDueAt = nextDueAt;
+    this.expiryTimer = setTimeout(() => {
+      if (generation !== this.timerGeneration) return;
+      this.expiryTimer = null;
+      this.timerDueAt = Number.POSITIVE_INFINITY;
+      this.sweepExpiredSpeakers();
+    }, Math.max(0, nextDueAt - now));
+  }
+
+  private sweepExpiredSpeakers(): void {
+    const now = this.now();
+    for (const [clientId, deadline] of this.activeUntil) {
+      if (deadline <= now) this.activeUntil.delete(clientId);
+    }
+
+    if (this.activeUntil.size > 0) {
+      this.scheduleNextSweep(now);
+    } else {
+      this.release();
+    }
+  }
+
+  private release(): void {
+    if (!this.ducking) return;
+    this.ducking = false;
+    this.target.setDuckingGain(1, this.timing.releaseMs);
+  }
+
+  private cancelTimer(): void {
+    this.timerGeneration++;
+    if (this.expiryTimer) clearTimeout(this.expiryTimer);
+    this.expiryTimer = null;
+    this.timerDueAt = Number.POSITIVE_INFINITY;
+  }
+}

src/data/config.test.ts

@@ -1,8 +1,31 @@
-import { describe, it, expect, afterEach } from "vitest";
+import { describe, it, expect, afterEach, beforeEach, vi } from "vitest";
 import { join } from "node:path";
-import { mkdtempSync, rmSync, writeFileSync } from "node:fs";
+import {
+  mkdtempSync,
+  rmSync,
+  writeFileSync,
+  existsSync,
+  readFileSync,
+  readdirSync,
+  renameSync,
+} from "node:fs";
 import { tmpdir } from "node:os";
-import { getDefaultConfig, loadConfig, saveConfig } from "./config.js";
+import { getDefaultConfig, loadConfig, saveConfig, migrateLegacyConfig, defaultPlatform } from "./config.js";
+
+// Wrap the fs functions config.ts uses in call-through spies so the atomic-write
+// and transient-read-error paths can be observed/forced. Everything else (mkdtemp,
+// rmSync, existsSync, …) is the real implementation via `...actual`, so all other
+// tests keep their real filesystem behavior. `vi.spyOn` can't be used here because
+// the node:fs ESM namespace is non-configurable in this setup.
+vi.mock("node:fs", async (importOriginal) => {
+  const actual = await importOriginal<typeof import("node:fs")>();
+  return {
+    ...actual,
+    readFileSync: vi.fn(actual.readFileSync),
+    writeFileSync: vi.fn(actual.writeFileSync),
+    renameSync: vi.fn(actual.renameSync),
+  };
+});
 
 describe("config", () => {
   const dirs: string[] = [];
@@ -25,6 +48,232 @@ describe("config", () => {
     expect(config).toEqual(getDefaultConfig());
   });
 
+  it("defaults voice ducking to disabled at 30 percent", () => {
+    expect(getDefaultConfig().voiceDucking).toEqual({
+      enabled: false,
+      volumePercent: 30,
+    });
+  });
+
+  it("fills voiceDucking defaults for legacy and partial configs", () => {
+    const dir = makeTmpDir();
+    const legacyPath = join(dir, "legacy.json");
+    writeFileSync(legacyPath, JSON.stringify({ webPort: 4000 }));
+    expect(loadConfig(legacyPath).voiceDucking).toEqual({
+      enabled: false,
+      volumePercent: 30,
+    });
+
+    const partialPath = join(dir, "partial.json");
+    writeFileSync(partialPath, JSON.stringify({ voiceDucking: { enabled: true } }));
+    expect(loadConfig(partialPath).voiceDucking).toEqual({
+      enabled: true,
+      volumePercent: 30,
+    });
+  });
+
+  it("loadConfig preserves valid voiceDucking values including range endpoints", () => {
+    const dir = makeTmpDir();
+    for (const volumePercent of [0, 37.5, 100]) {
+      const path = join(dir, `voice-ducking-${volumePercent}.json`);
+      writeFileSync(
+        path,
+        JSON.stringify({ voiceDucking: { enabled: true, volumePercent } }),
+      );
+      expect(loadConfig(path).voiceDucking).toEqual({ enabled: true, volumePercent });
+    }
+  });
+
+  it("loadConfig strictly sanitizes malformed voiceDucking values", () => {
+    const dir = makeTmpDir();
+    const malformed: Array<{ name: string; json: string }> = [
+      { name: "null-block", json: JSON.stringify({ voiceDucking: null }) },
+      { name: "array-block", json: JSON.stringify({ voiceDucking: [true, 10] }) },
+      { name: "string-block", json: JSON.stringify({ voiceDucking: "on" }) },
+      {
+        name: "wrong-types",
+        json: JSON.stringify({ voiceDucking: { enabled: "yes", volumePercent: "25" } }),
+      },
+      {
+        name: "below-range",
+        json: JSON.stringify({ voiceDucking: { enabled: true, volumePercent: -1 } }),
+      },
+      {
+        name: "above-range",
+        json: JSON.stringify({ voiceDucking: { enabled: true, volumePercent: 101 } }),
+      },
+      // JSON.parse("1e309") produces Infinity, exercising the finite-number guard.
+      {
+        name: "non-finite",
+        json: '{"voiceDucking":{"enabled":true,"volumePercent":1e309}}',
+      },
+    ];
+
+    for (const testCase of malformed) {
+      const path = join(dir, `${testCase.name}.json`);
+      writeFileSync(path, testCase.json);
+      const loaded = loadConfig(path).voiceDucking;
+      if (testCase.name === "below-range" || testCase.name === "above-range" || testCase.name === "non-finite") {
+        expect(loaded).toEqual({ enabled: true, volumePercent: 30 });
+      } else {
+        expect(loaded).toEqual({ enabled: false, volumePercent: 30 });
+      }
+    }
+  });
+
+  it("defaults to the online sources with jellyfin as opt-in (disabled)", () => {
+    const config = getDefaultConfig();
+    expect(config.enabledProviders).toEqual(["netease", "qq", "bilibili", "youtube", "kugou"]);
+    expect(config.enabledProviders).not.toContain("jellyfin");
+  });
+
+  it("keeps pre-gating behavior for legacy configs without enabledProviders", () => {
+    const dir = makeTmpDir();
+    const path = join(dir, "config.json");
+    // A config written before enabledProviders existed: no such field.
+    writeFileSync(path, JSON.stringify({ webPort: 4000 }));
+    const config = loadConfig(path);
+    expect(config.enabledProviders).toEqual(["netease", "qq", "bilibili", "youtube", "kugou"]);
+    expect(defaultPlatform(config)).toBe("netease");
+  });
+
+  it("defaultPlatform follows the fixed priority order", () => {
+    const config = getDefaultConfig();
+    expect(defaultPlatform(config)).toBe("netease");
+
+    // Jellyfin ranks after the online music platforms…
+    config.enabledProviders = ["netease", "jellyfin"];
+    expect(defaultPlatform(config)).toBe("netease");
+    // …but ahead of the video sites…
+    config.enabledProviders = ["bilibili", "jellyfin", "youtube"];
+    expect(defaultPlatform(config)).toBe("jellyfin");
+    // …and is the default when it is the only enabled source.
+    config.enabledProviders = ["jellyfin"];
+    expect(defaultPlatform(config)).toBe("jellyfin");
+    // Nothing enabled → netease fallback (the gate then reports it disabled).
+    config.enabledProviders = [];
+    expect(defaultPlatform(config)).toBe("netease");
+  });
+
+  // --- #126: an explicit operator default source ---
+
+  it("defaultPlatform is null by default (follow the priority order)", () => {
+    expect(getDefaultConfig().defaultPlatform).toBeNull();
+  });
+
+  it("defaultPlatform() honors an explicit, enabled preference over the priority order", () => {
+    const config = getDefaultConfig();
+    // Priority would pick netease; a Bilibili-loving server sets B站 instead (#126).
+    config.defaultPlatform = "bilibili";
+    expect(defaultPlatform(config)).toBe("bilibili");
+  });
+
+  it("defaultPlatform() ignores a preference whose source is not enabled", () => {
+    const config = getDefaultConfig();
+    config.defaultPlatform = "jellyfin"; // opt-in, not enabled in the default config
+    // Falls back to the fixed priority order (netease)…
+    expect(defaultPlatform(config)).toBe("netease");
+    // …until the preferred source is actually enabled.
+    config.enabledProviders = [...config.enabledProviders, "jellyfin"];
+    expect(defaultPlatform(config)).toBe("jellyfin");
+  });
+
+  it("loadConfig keeps a valid, enabled defaultPlatform", () => {
+    const dir = makeTmpDir();
+    const path = join(dir, "config.json");
+    writeFileSync(path, JSON.stringify({ defaultPlatform: "bilibili" }));
+    const config = loadConfig(path);
+    expect(config.defaultPlatform).toBe("bilibili");
+    expect(defaultPlatform(config)).toBe("bilibili");
+  });
+
+  it("loadConfig nulls a defaultPlatform that is unknown, disabled, or the wrong type", () => {
+    const dir = makeTmpDir();
+    // Unknown provider name.
+    const p1 = join(dir, "c1.json");
+    writeFileSync(p1, JSON.stringify({ defaultPlatform: "bogus" }));
+    expect(loadConfig(p1).defaultPlatform).toBeNull();
+    // Known provider, but not in enabledProviders.
+    const p2 = join(dir, "c2.json");
+    writeFileSync(p2, JSON.stringify({ enabledProviders: ["netease"], defaultPlatform: "bilibili" }));
+    expect(loadConfig(p2).defaultPlatform).toBeNull();
+    // Wrong type.
+    const p3 = join(dir, "c3.json");
+    writeFileSync(p3, JSON.stringify({ defaultPlatform: 42 }));
+    expect(loadConfig(p3).defaultPlatform).toBeNull();
+  });
+
+  it("round-trips defaultPlatform through save/load", () => {
+    const dir = makeTmpDir();
+    const path = join(dir, "config.json");
+    saveConfig(path, { ...getDefaultConfig(), defaultPlatform: "qq" });
+    expect(loadConfig(path).defaultPlatform).toBe("qq");
+  });
+
+  it("respects an explicit jellyfin-only enabledProviders from disk", () => {
+    const dir = makeTmpDir();
+    const path = join(dir, "config.json");
+    // e.g. a config persisted by the short-lived jellyfin-by-default builds.
+    writeFileSync(path, JSON.stringify({ enabledProviders: ["jellyfin"] }));
+    const config = loadConfig(path);
+    expect(config.enabledProviders).toEqual(["jellyfin"]);
+    expect(defaultPlatform(config)).toBe("jellyfin");
+  });
+
+  // ── audioQuality persistence (#125) ─────────────────────────────────────
+  it("defaults audioQuality to each provider's in-memory default", () => {
+    const config = getDefaultConfig();
+    expect(config.audioQuality).toEqual({
+      netease: "exhigh",
+      qq: "exhigh",
+      bilibili: "high",
+      kugou: "128",
+      jellyfin: "direct",
+    });
+  });
+
+  it("fills audioQuality defaults for a legacy config without the field", () => {
+    const dir = makeTmpDir();
+    const path = join(dir, "config.json");
+    writeFileSync(path, JSON.stringify({ webPort: 4000 }));
+    const config = loadConfig(path);
+    expect(config.audioQuality).toEqual(getDefaultConfig().audioQuality);
+  });
+
+  it("round-trips a saved audioQuality through save/load", () => {
+    const dir = makeTmpDir();
+    const path = join(dir, "config.json");
+    const config = getDefaultConfig();
+    config.audioQuality = {
+      netease: "lossless",
+      qq: "flac",
+      bilibili: "high",
+      kugou: "flac",
+      jellyfin: "320",
+    };
+    saveConfig(path, config);
+    const loaded = loadConfig(path);
+    expect(loaded.audioQuality).toEqual(config.audioQuality);
+  });
+
+  it("coerces missing / non-string audioQuality fields to defaults", () => {
+    const dir = makeTmpDir();
+    const path = join(dir, "config.json");
+    // netease valid, qq blank, bilibili wrong type, kugou missing, jellyfin valid.
+    writeFileSync(
+      path,
+      JSON.stringify({ audioQuality: { netease: "lossless", qq: "  ", bilibili: 320, jellyfin: "192" } }),
+    );
+    const config = loadConfig(path);
+    expect(config.audioQuality).toEqual({
+      netease: "lossless",
+      qq: "exhigh", // blank → default
+      bilibili: "high", // non-string → default
+      kugou: "128", // missing → default
+      jellyfin: "192",
+    });
+  });
+
   it("creates config file on save", () => {
     const dir = makeTmpDir();
     const path = join(dir, "sub", "config.json");
@@ -49,6 +298,406 @@ describe("config", () => {
     // defaults should fill in the rest
     expect(loaded.theme).toBe("dark");
     expect(loaded.commandPrefix).toBe("!");
-    expect(loaded.autoPauseOnEmpty).toBe(true);
+    // auto-pause defaults OFF (occupancy detection is unreliable on some servers)
+    expect(loaded.autoPauseOnEmpty).toBe(false);
+  });
+
+  // --- #86: config.json must live under (and be created in) the persisted data dir ---
+
+  it("first run writes config.json into the data dir and reads it back", () => {
+    const root = makeTmpDir();
+    const dataDir = join(root, "data");
+    const configPath = join(dataDir, "config.json"); // mirrors index.ts CONFIG_PATH
+
+    // Boot sequence: load (missing -> defaults) then save.
+    const config = loadConfig(configPath);
+    saveConfig(configPath, config);
+
+    expect(existsSync(configPath)).toBe(true);
+    // A subsequent hand-edited file under the SAME persisted path is honored.
+    writeFileSync(configPath, JSON.stringify({ webPort: 9999 }), "utf-8");
+    expect(loadConfig(configPath).webPort).toBe(9999);
+  });
+
+  it("migrates a legacy root config into the data dir, preserving values", () => {
+    const root = makeTmpDir();
+    const legacyPath = join(root, "config.json");
+    const newPath = join(root, "data", "config.json");
+    writeFileSync(legacyPath, JSON.stringify({ webPort: 4242, publicUrl: "http://x" }), "utf-8");
+
+    const migrated = migrateLegacyConfig(legacyPath, newPath);
+
+    expect(migrated).toBe(true);
+    expect(existsSync(newPath)).toBe(true);
+    expect(existsSync(legacyPath)).toBe(false); // legacy moved, not duplicated
+    const loaded = loadConfig(newPath);
+    expect(loaded.webPort).toBe(4242);
+    expect(loaded.publicUrl).toBe("http://x");
+  });
+
+  it("does NOT overwrite an existing data-dir config during migration", () => {
+    const root = makeTmpDir();
+    const legacyPath = join(root, "config.json");
+    const newPath = join(root, "data", "config.json");
+    writeFileSync(legacyPath, JSON.stringify({ webPort: 1111 }), "utf-8");
+    saveConfig(newPath, { ...getDefaultConfig(), webPort: 2222 });
+
+    const migrated = migrateLegacyConfig(legacyPath, newPath);
+
+    expect(migrated).toBe(false); // new location wins, untouched
+    expect(loadConfig(newPath).webPort).toBe(2222);
+    expect(existsSync(legacyPath)).toBe(true); // legacy left intact when not migrated
+  });
+
+  it("migration is a no-op when there is no legacy config", () => {
+    const root = makeTmpDir();
+    const migrated = migrateLegacyConfig(join(root, "config.json"), join(root, "data", "config.json"));
+    expect(migrated).toBe(false);
+  });
+});
+
+describe("guestMode config", () => {
+  it("defaults to disabled, all-bots, append-only", () => {
+    const c = getDefaultConfig();
+    expect(c.guestMode.enabled).toBe(false);
+    expect(c.guestMode.bots).toBe("all");
+    expect(c.guestMode.permissions).toEqual({
+      addToQueue: true, playNext: false, playNow: false,
+      skip: false, transport: false, removeClear: false, playMode: false,
+      playCollection: false,
+    });
+  });
+
+  it("deep-merges a partial guestMode so missing sub-keys are back-filled", () => {
+    const dir = mkdtempSync(join(tmpdir(), "tsmb-cfg-"));
+    const p = join(dir, "config.json");
+    writeFileSync(p, JSON.stringify({ guestMode: { enabled: true, permissions: { playNext: true } } }));
+    const c = loadConfig(p);
+    expect(c.guestMode.enabled).toBe(true);
+    expect(c.guestMode.bots).toBe("all"); // back-filled
+    expect(c.guestMode.permissions.playNext).toBe(true);
+    expect(c.guestMode.permissions.addToQueue).toBe(true); // back-filled default
+    expect(c.guestMode.permissions.skip).toBe(false); // back-filled default
+    rmSync(dir, { recursive: true, force: true });
+  });
+
+  // --- B1: loadConfig must sanitize a hand-edited/legacy/corrupt guestMode ---
+
+  function loadGuestMode(raw: unknown) {
+    const dir = mkdtempSync(join(tmpdir(), "tsmb-cfg-"));
+    const p = join(dir, "config.json");
+    writeFileSync(p, JSON.stringify(raw));
+    try {
+      return loadConfig(p).guestMode;
+    } finally {
+      rmSync(dir, { recursive: true, force: true });
+    }
+  }
+
+  describe("bots normalization", () => {
+    it("a numeric bots value falls back to the default \"all\" (no crash)", () => {
+      const gm = loadGuestMode({ guestMode: { bots: 5 } });
+      expect(gm.bots).toBe("all");
+    });
+    it("an array bots value is filtered to strings only", () => {
+      const gm = loadGuestMode({ guestMode: { bots: ["a", 2, "b"] } });
+      expect(gm.bots).toEqual(["a", "b"]);
+    });
+    it("the literal \"all\" is preserved", () => {
+      const gm = loadGuestMode({ guestMode: { bots: "all" } });
+      expect(gm.bots).toBe("all");
+    });
+  });
+
+  describe("permissions coercion", () => {
+    it("a non-boolean truthy flag is coerced to false; a real true stays true", () => {
+      const gm = loadGuestMode({ guestMode: { permissions: { skip: 1, playNext: true } } });
+      expect(gm.permissions.skip).toBe(false);
+      expect(gm.permissions.playNext).toBe(true);
+    });
+    it("a string permissions value yields defaults with no numeric index keys", () => {
+      const gm = loadGuestMode({ guestMode: { permissions: "hacked" } });
+      // all known flags present at their defaults
+      expect(gm.permissions).toEqual({
+        addToQueue: true, playNext: false, playNow: false,
+        skip: false, transport: false, removeClear: false, playMode: false,
+        playCollection: false,
+      });
+      // no garbage index keys leaked from spreading a string
+      expect((gm.permissions as unknown as Record<string, unknown>)["0"]).toBeUndefined();
+    });
+  });
+});
+
+describe("adminGroups normalization", () => {
+  function loadAdminGroups(raw: unknown) {
+    const dir = mkdtempSync(join(tmpdir(), "tsmb-cfg-"));
+    const p = join(dir, "config.json");
+    writeFileSync(p, JSON.stringify(raw));
+    try {
+      return loadConfig(p).adminGroups;
+    } finally {
+      rmSync(dir, { recursive: true, force: true });
+    }
+  }
+
+  it("defaults to [] when absent", () => {
+    expect(loadAdminGroups({})).toEqual([]);
+  });
+  it("keeps valid non-negative integers", () => {
+    expect(loadAdminGroups({ adminGroups: [6, 8] })).toEqual([6, 8]);
+  });
+  it("filters out negatives, non-integers and non-numbers", () => {
+    expect(loadAdminGroups({ adminGroups: [6, -1, 2.5, "8", null] })).toEqual([6]);
+  });
+  it("a non-array value falls back to the default [] (no crash)", () => {
+    expect(loadAdminGroups({ adminGroups: "6" })).toEqual([]);
+  });
+});
+
+describe("spotify config", () => {
+  it("defaults are present and disabled", () => {
+    const c = getDefaultConfig();
+    expect(c.spotify).toEqual({
+      enabled: false,
+      backend: "auto",
+      clientId: "",
+      clientSecret: "",
+      deviceName: "TSMusicBot",
+      bitrate: 320,
+    });
+  });
+
+  it("loadConfig coerces bad spotify values back to safe defaults", () => {
+    const dir = mkdtempSync(join(tmpdir(), "cfg-"));
+    const p = join(dir, "config.json");
+    writeFileSync(
+      p,
+      JSON.stringify({
+        spotify: { enabled: "yes", backend: "bogus", bitrate: 7, clientId: 5 },
+      })
+    );
+    const c = loadConfig(p);
+    expect(c.spotify.enabled).toBe(false); // non-boolean → false
+    expect(c.spotify.backend).toBe("auto"); // invalid enum → auto
+    expect(c.spotify.bitrate).toBe(320); // invalid → 320
+    expect(c.spotify.clientId).toBe(""); // non-string → ""
+    expect(c.spotify.deviceName).toBe("TSMusicBot"); // missing → default
+  });
+
+  it("loadConfig preserves valid spotify values", () => {
+    const dir = mkdtempSync(join(tmpdir(), "cfg-"));
+    const p = join(dir, "config.json");
+    writeFileSync(
+      p,
+      JSON.stringify({
+        spotify: {
+          enabled: true,
+          backend: "librespot",
+          clientId: "abc",
+          clientSecret: "def",
+          deviceName: "MyBot",
+          bitrate: 160,
+        },
+      })
+    );
+    const c = loadConfig(p);
+    expect(c.spotify).toEqual({
+      enabled: true,
+      backend: "librespot",
+      clientId: "abc",
+      clientSecret: "def",
+      deviceName: "MyBot",
+      bitrate: 160,
+    });
+  });
+});
+
+// --- R2-1: saveConfig must write atomically (temp file + rename), never truncate ---
+
+describe("saveConfig atomic write", () => {
+  const dirs: string[] = [];
+  function makeTmpDir(): string {
+    const dir = mkdtempSync(join(tmpdir(), "tsmb-atomic-"));
+    dirs.push(dir);
+    return dir;
+  }
+  beforeEach(() => {
+    vi.clearAllMocks(); // reset call history, keep the call-through implementations
+  });
+  afterEach(() => {
+    for (const d of dirs) rmSync(d, { recursive: true, force: true });
+    dirs.length = 0;
+  });
+
+  it("round-trips (save then load equals) and leaves NO .tmp file behind", () => {
+    const dir = makeTmpDir();
+    const path = join(dir, "config.json");
+    const config = { ...getDefaultConfig(), webPort: 4567, adminPassword: "pw" };
+
+    saveConfig(path, config);
+
+    expect(loadConfig(path)).toEqual(config);
+    // No temp remnants in the target directory.
+    expect(readdirSync(dir).filter((f) => f.includes(".tmp"))).toEqual([]);
+  });
+
+  it("writes via a same-dir temp file then renameSync onto the final path", () => {
+    const dir = makeTmpDir();
+    const path = join(dir, "config.json");
+
+    saveConfig(path, getDefaultConfig());
+
+    expect(vi.mocked(renameSync)).toHaveBeenCalled();
+    const [from, to] = vi.mocked(renameSync).mock.calls[0] as [string, string];
+    expect(to).toBe(path); // renamed ONTO the real path
+    expect(String(from)).not.toBe(path); // ...from a distinct temp file
+    expect(join(String(from), "..")).toBe(join(path, "..")); // ...in the SAME directory
+  });
+
+  it("does not corrupt a pre-existing valid config when saving over it", () => {
+    const dir = makeTmpDir();
+    const path = join(dir, "config.json");
+    saveConfig(path, { ...getDefaultConfig(), adminPassword: "first", webPort: 1234 });
+
+    // Overwrite with a different, fully-formed config.
+    saveConfig(path, { ...getDefaultConfig(), adminPassword: "second", webPort: 9999 });
+
+    const loaded = loadConfig(path);
+    expect(loaded.adminPassword).toBe("second");
+    expect(loaded.webPort).toBe(9999);
+    // The on-disk file is a single complete JSON document (no partial/truncated write).
+    expect(() => JSON.parse(readFileSync(path, "utf-8"))).not.toThrow();
+    expect(readdirSync(dir).filter((f) => f.includes(".tmp"))).toEqual([]);
+  });
+
+  it("cleans up the temp file (no .tmp remnant) when the rename fails", () => {
+    const dir = makeTmpDir();
+    const path = join(dir, "config.json");
+    vi.mocked(renameSync).mockImplementationOnce(() => {
+      throw new Error("rename boom");
+    });
+
+    expect(() => saveConfig(path, getDefaultConfig())).toThrow(/rename boom/);
+    // The failed write left no temp file lying around.
+    expect(readdirSync(dir).filter((f) => f.includes(".tmp"))).toEqual([]);
+  });
+});
+
+// --- R2-2: loadConfig must not treat a transient/corrupt read as "missing" ---
+
+describe("loadConfig error handling", () => {
+  const dirs: string[] = [];
+  function makeTmpDir(): string {
+    const dir = mkdtempSync(join(tmpdir(), "tsmb-load-"));
+    dirs.push(dir);
+    return dir;
+  }
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+  afterEach(() => {
+    for (const d of dirs) rmSync(d, { recursive: true, force: true });
+    dirs.length = 0;
+  });
+
+  it("(a) ENOENT (missing file) returns defaults — unchanged first-run behavior", () => {
+    const dir = makeTmpDir();
+    expect(loadConfig(join(dir, "config.json"))).toEqual(getDefaultConfig());
+  });
+
+  it("(b) a non-ENOENT read error (EBUSY) rethrows instead of returning defaults", () => {
+    const dir = makeTmpDir();
+    const path = join(dir, "config.json");
+    // A REAL config exists on disk; a transient lock must NOT collapse to defaults
+    // (the caller would otherwise overwrite this real config with defaults).
+    saveConfig(path, { ...getDefaultConfig(), adminPassword: "keep-me" });
+    vi.mocked(readFileSync).mockImplementationOnce(() => {
+      const err = new Error("EBUSY: resource busy or locked") as NodeJS.ErrnoException;
+      err.code = "EBUSY";
+      throw err;
+    });
+
+    expect(() => loadConfig(path)).toThrow(/EBUSY/);
+    // The on-disk config is untouched and still readable once the lock clears.
+    expect(loadConfig(path).adminPassword).toBe("keep-me");
+  });
+
+  it("(c) corrupt JSON returns defaults AND backs up the original to *.corrupt-*", () => {
+    const dir = makeTmpDir();
+    const path = join(dir, "config.json");
+    const garbage = "{ not: valid json, ";
+    writeFileSync(path, garbage, "utf-8");
+
+    const loaded = loadConfig(path);
+
+    expect(loaded).toEqual(getDefaultConfig());
+    const backups = readdirSync(dir).filter((f) => f.includes(".corrupt-"));
+    expect(backups.length).toBeGreaterThan(0);
+    // The corrupt original is preserved verbatim (recoverable, never deleted).
+    expect(readFileSync(join(dir, backups[0]), "utf-8")).toBe(garbage);
+  });
+
+  // (d)/(e) Valid JSON that is NOT a non-null object (null / [] / 42 / "str") passes
+  // JSON.parse but would throw a raw TypeError in the per-field sanitize block
+  // (property access on a non-object), bypassing the corrupt-backup path. It must be
+  // treated EXACTLY like corrupt JSON: back up to *.corrupt-* (original preserved),
+  // return defaults — NOT a thrown TypeError, and NOT a silent defaults-with-no-backup.
+  it("(d) a `null` config is treated as corrupt: defaults + *.corrupt-* backup (original preserved)", () => {
+    const dir = makeTmpDir();
+    const path = join(dir, "config.json");
+    writeFileSync(path, "null", "utf-8");
+
+    let loaded: ReturnType<typeof getDefaultConfig>;
+    expect(() => {
+      loaded = loadConfig(path);
+    }).not.toThrow();
+
+    expect(loaded!).toEqual(getDefaultConfig());
+    const backups = readdirSync(dir).filter((f) => f.includes(".corrupt-"));
+    expect(backups.length).toBeGreaterThan(0);
+    expect(readFileSync(join(dir, backups[0]), "utf-8")).toBe("null");
+  });
+
+  it("(e) a non-object config (`[]` / `42`) is backed up + defaults, not a thrown TypeError", () => {
+    for (const content of ["[]", "42"]) {
+      const dir = makeTmpDir();
+      const path = join(dir, "config.json");
+      writeFileSync(path, content, "utf-8");
+
+      let loaded: ReturnType<typeof getDefaultConfig>;
+      expect(() => {
+        loaded = loadConfig(path);
+      }).not.toThrow();
+
+      expect(loaded!).toEqual(getDefaultConfig());
+      const backups = readdirSync(dir).filter((f) => f.includes(".corrupt-"));
+      expect(backups.length).toBeGreaterThan(0);
+      expect(readFileSync(join(dir, backups[0]), "utf-8")).toBe(content);
+    }
+  });
+
+  it("defaults savedQueuesEnabled and playKeepsQueue to false", () => {
+    const c = getDefaultConfig();
+    expect(c.savedQueuesEnabled).toBe(false);
+    expect(c.playKeepsQueue).toBe(false);
+  });
+
+  it("coerces non-boolean savedQueues/playKeepsQueue values to false on load", () => {
+    const dir = makeTmpDir();
+    const path = join(dir, "config.json");
+    writeFileSync(path, JSON.stringify({ savedQueuesEnabled: "yes", playKeepsQueue: 1 }));
+    const c = loadConfig(path);
+    expect(c.savedQueuesEnabled).toBe(false);
+    expect(c.playKeepsQueue).toBe(false);
+  });
+
+  it("preserves savedQueues/playKeepsQueue true when explicitly enabled", () => {
+    const dir = makeTmpDir();
+    const path = join(dir, "config.json");
+    writeFileSync(path, JSON.stringify({ savedQueuesEnabled: true, playKeepsQueue: true }));
+    const c = loadConfig(path);
+    expect(c.savedQueuesEnabled).toBe(true);
+    expect(c.playKeepsQueue).toBe(true);
   });
 });

src/data/config.ts

@@ -1,5 +1,111 @@
-import { readFileSync, writeFileSync, mkdirSync } from "node:fs";
+import {
+  readFileSync,
+  writeFileSync,
+  mkdirSync,
+  existsSync,
+  copyFileSync,
+  rmSync,
+  renameSync,
+} from "node:fs";
 import { dirname } from "node:path";
+import type { BotAccess, GuestPermissions } from "./permissions.js";
+import { GUEST_PERMISSION_FLAGS } from "./permissions.js";
+
+export interface GuestModeConfig {
+  enabled: boolean;
+  bots: BotAccess; // "all" | string[]
+  permissions: GuestPermissions;
+}
+
+export interface SpotifyConfig {
+  enabled: boolean;
+  backend: "auto" | "go-librespot" | "librespot";
+  clientId: string;
+  clientSecret: string;
+  deviceName: string;
+  bitrate: number;
+}
+
+export interface JellyfinConfig {
+  /** Base URL of the Jellyfin server, e.g. "https://jellyfin.example.com". */
+  serverUrl: string;
+  authMode: "userpass" | "apikey";
+  // userpass mode
+  username: string;
+  password: string;
+  // apikey mode: admin API key + the user whose library/favorites/playlists are used
+  apiKey: string;
+  userId: string;
+}
+
+/**
+ * Per-provider audio quality (音质), persisted so a restart keeps the user's
+ * choice instead of resetting each provider to its in-memory default (#125).
+ * The values are the same strings the WebUI/REST `POST /api/music/quality`
+ * endpoint sends and each provider's setQuality() accepts; on startup they are
+ * replayed onto the (shared, process-wide) providers. Providers ignore/normalize
+ * unknown values, so a stale/hand-edited entry can never break playback.
+ */
+export interface AudioQualityConfig {
+  netease: string;
+  qq: string;
+  bilibili: string;
+  kugou: string;
+  jellyfin: string;
+}
+
+export interface VoiceDuckingConfig {
+  enabled: boolean;
+  /** Percentage of the normal playback volume retained while someone speaks. */
+  volumePercent: number;
+}
+
+/**
+ * Providers gated by `enabledProviders`. Not listed here:
+ *  - "local"   → governed by the existing `localAudioEnabled` flag
+ *  - "spotify" → governed by the existing `spotify.enabled` flag
+ */
+export const GATEABLE_PROVIDERS = [
+  "jellyfin",
+  "netease",
+  "qq",
+  "bilibili",
+  "youtube",
+  "kugou",
+] as const;
+export type GateableProvider = (typeof GATEABLE_PROVIDERS)[number];
+
+/** Whether a platform may be used for search/playback under the current config. */
+export function isProviderEnabled(config: BotConfig, platform: string): boolean {
+  if (platform === "local") return config.localAudioEnabled !== false;
+  if (platform === "spotify") return config.spotify.enabled;
+  return config.enabledProviders.includes(platform as GateableProvider);
+}
+
+/**
+ * The default platform for !play/!add/!playlist/!album and all REST/WebUI calls.
+ *
+ * An explicit user preference (`config.defaultPlatform`) wins whenever it points
+ * at a source that is currently enabled — this lets e.g. a Bilibili-loving server
+ * set B站 as the default so `!play <歌名>` needs no `-b` flag (issue #126). The
+ * enabled-guard here matters at runtime too: if the operator later disables the
+ * preferred source, we must fall through instead of returning a dead default.
+ *
+ * With no (usable) preference we fall back to the first enabled provider in a
+ * fixed priority order (netease with the default config; jellyfin ranks after
+ * the online music platforms because it is an opt-in source, but ahead of the
+ * video sites for users who run it as their only music library). Falls back to
+ * "netease" when nothing is enabled so callers always get a provider — the
+ * enabled-gate then produces the friendly error.
+ */
+export function defaultPlatform(config: BotConfig): GateableProvider {
+  const pref = config.defaultPlatform;
+  if (pref && config.enabledProviders.includes(pref)) return pref;
+  for (const p of ["netease", "qq", "kugou", "jellyfin", "bilibili", "youtube"] as const) {
+    if (config.enabledProviders.includes(p)) return p;
+  }
+  return "netease";
+}
 
 export interface BotConfig {
   webPort: number;
@@ -13,7 +119,24 @@ export interface BotConfig {
   adminGroups: number[];
   autoReturnDelay: number;
   autoPauseOnEmpty: boolean;
+  /** Lower music volume while voice from another client is being received. */
+  voiceDucking: VoiceDuckingConfig;
   idleTimeoutMinutes: number;
+  /** Enable uploading and playback of server-stored local audio files. */
+  localAudioEnabled: boolean;
+  /**
+   * Enable named save/load of queues (chat + web) AND auto-restore of the live
+   * queue across a restart. Admin-controlled; default false so nothing is
+   * persisted/restored until an operator opts in.
+   */
+  savedQueuesEnabled: boolean;
+  /**
+   * When true, a single-song immediate !play (chat) / play-song (web) inserts
+   * after the current track and jumps to it instead of clearing the queue, so
+   * the rest of the queue survives and continues afterwards. Default false
+   * keeps today's clear-and-play behavior.
+   */
+  playKeepsQueue: boolean;
   // Public base URL used when generating share links (e.g. the bot专属链接).
   // Leave empty to use the browser's current origin. Example:
   //   "https://music.example.com" or "http://1.2.3.4:3000"
@@ -22,6 +145,27 @@ export interface BotConfig {
   // (nginx/Caddy/Cloudflare). Required for correct protocol/host detection
   // behind HTTPS-terminating proxies.
   trustProxy: boolean;
+  guestMode: GuestModeConfig;
+  spotify: SpotifyConfig;
+  jellyfin: JellyfinConfig;
+  /** Persisted per-provider audio quality (音质), restored on startup (#125). */
+  audioQuality: AudioQualityConfig;
+  /**
+   * Which gateable providers are active (see GATEABLE_PROVIDERS). Default is
+   * the online sources (NetEase/QQ/Bilibili/YouTube/Kugou); jellyfin is an
+   * opt-in extra that must be listed here (Settings → Jellyfin 音乐库 toggles
+   * it). Sources not listed stay disabled — the NetEase/QQ embedded sidecar
+   * API servers must not start (or bind ports 3001/3200) unless enabled.
+   */
+  enabledProviders: GateableProvider[];
+  /**
+   * Optional operator-chosen default source for commands/REST/WebUI calls that
+   * omit a platform (issue #126). When set to an enabled gateable provider it
+   * overrides the fixed priority order in defaultPlatform(); `null` (the default)
+   * keeps that priority order. loadConfig cleans stale/unknown/disabled values
+   * back to null.
+   */
+  defaultPlatform: GateableProvider | null;
 }
 
 export function getDefaultConfig(): BotConfig {
@@ -36,25 +180,343 @@ export function getDefaultConfig(): BotConfig {
     adminPassword: "",
     adminGroups: [],
     autoReturnDelay: 300,
-    autoPauseOnEmpty: true,
+    // Default OFF: occupancy detection relies on the full-client `clientlist`
+    // command, which is unreliable on some servers (it can time out when other
+    // clients are present). Users can opt in from the web UI.
+    autoPauseOnEmpty: false,
+    voiceDucking: {
+      enabled: false,
+      volumePercent: 30,
+    },
     idleTimeoutMinutes: 0,
+    localAudioEnabled: true,
+    savedQueuesEnabled: false,
+    playKeepsQueue: false,
     publicUrl: "",
     trustProxy: false,
+    guestMode: {
+      enabled: false,
+      bots: "all",
+      permissions: {
+        addToQueue: true,
+        playNext: false,
+        playNow: false,
+        skip: false,
+        transport: false,
+        removeClear: false,
+        playMode: false,
+        playCollection: false,
+      },
+    },
+    spotify: {
+      enabled: false,
+      backend: "auto",
+      clientId: "",
+      clientSecret: "",
+      deviceName: "TSMusicBot",
+      bitrate: 320,
+    },
+    jellyfin: {
+      serverUrl: "",
+      authMode: "userpass",
+      username: "",
+      password: "",
+      apiKey: "",
+      userId: "",
+    },
+    // Mirrors each provider's own in-memory default quality; overwritten on
+    // startup once the user has changed a quality (persisted via #125).
+    audioQuality: {
+      netease: "exhigh",
+      qq: "exhigh",
+      bilibili: "high",
+      kugou: "128",
+      jellyfin: "direct",
+    },
+    enabledProviders: ["netease", "qq", "bilibili", "youtube", "kugou"],
+    defaultPlatform: null,
   };
 }
 
+/**
+ * Move an unusable config aside to a timestamped `*.corrupt-*` backup so the data
+ * stays recoverable (it is NEVER deleted), for both the corrupt-JSON case and the
+ * parses-but-not-an-object case. Prefer an atomic same-dir rename; if that fails,
+ * copy instead. If it can't be preserved at all, rethrow rather than let the caller
+ * overwrite unrecoverable data.
+ */
+function backupCorruptConfig(path: string): void {
+  const backup = `${path}.corrupt-${Date.now()}`;
+  try {
+    renameSync(path, backup);
+  } catch {
+    try {
+      copyFileSync(path, backup);
+    } catch (backupErr) {
+      throw backupErr;
+    }
+  }
+}
+
 export function loadConfig(path: string): BotConfig {
   const defaults = getDefaultConfig();
+
+  // Distinguish the three failure modes so a *real* on-disk config is NEVER
+  // silently replaced with defaults (the caller saveConfig()s right after load,
+  // which would otherwise erase spotify creds / adminPassword / adminGroups /
+  // guestMode permanently):
+  //   (a) file ABSENT (ENOENT) — normal first run → defaults.
+  //   (b) any OTHER read error (EBUSY/EACCES/EPERM/EISDIR/…) on an existing file —
+  //       rethrow (fail-fast at boot). A loud crash beats silent credential loss.
+  //   (c) file readable but JSON.parse fails (corrupt) — back the file up first
+  //       (never delete it), THEN return defaults so boot can proceed.
+  let raw: string;
   try {
-    const raw = readFileSync(path, "utf-8");
-    const partial = JSON.parse(raw) as Partial<BotConfig>;
-    return { ...defaults, ...partial };
+    raw = readFileSync(path, "utf-8");
+  } catch (err) {
+    if ((err as NodeJS.ErrnoException).code === "ENOENT") {
+      return defaults; // (a) missing file — first run
+    }
+    throw err; // (b) transient/permission error on an existing file — do not clobber it
+  }
+
+  let parsed: unknown;
+  try {
+    parsed = JSON.parse(raw);
   } catch {
+    // (c) Corrupt content: move the unreadable file aside to a timestamped backup
+    // so the data stays recoverable, then fall back to defaults.
+    backupCorruptConfig(path);
     return defaults;
   }
+
+  // (d) Parses cleanly but is NOT a non-null object (e.g. `null`, `42`, `"str"`,
+  // `[]`). The per-field sanitize below assumes an object and would throw a raw
+  // TypeError (or silently spread junk), bypassing the corrupt-backup path. Treat
+  // it EXACTLY like corrupt JSON: back it up (never delete), then return defaults.
+  if (typeof parsed !== "object" || parsed === null || Array.isArray(parsed)) {
+    backupCorruptConfig(path);
+    return defaults;
+  }
+  const partial = parsed as Partial<BotConfig>;
+
+  {
+    // Normalize/sanitize guestMode on load. The WRITE path (POST /api/bot/settings)
+    // sanitizes too, but a hand-edited/legacy/corrupt config.json reaches the gate
+    // directly — so coerce it here as well, mirroring that write-path logic.
+    const partialGm = (partial.guestMode ?? {}) as Partial<GuestModeConfig>;
+    const gm: GuestModeConfig = {
+      ...defaults.guestMode,
+      ...partialGm,
+      // bots → "all" | string[]; anything else falls back to the default ("all").
+      bots:
+        partialGm.bots === "all"
+          ? "all"
+          : Array.isArray(partialGm.bots)
+            ? partialGm.bots.filter((id): id is string => typeof id === "string")
+            : defaults.guestMode.bots,
+      // permissions → defaults, then spread ONLY a plain object, then strict-coerce
+      // each known flag to a boolean (drops index keys + non-boolean values).
+      permissions: { ...defaults.guestMode.permissions },
+    };
+    const partialPerms = partialGm.permissions;
+    if (
+      partialPerms !== null &&
+      typeof partialPerms === "object" &&
+      !Array.isArray(partialPerms)
+    ) {
+      Object.assign(gm.permissions, partialPerms);
+    }
+    for (const f of GUEST_PERMISSION_FLAGS) {
+      gm.permissions[f] = gm.permissions[f] === true;
+    }
+
+    // Sanitize adminGroups on load too: the WebUI write path filters it, but a
+    // hand-edited / legacy / corrupt config.json reaches the command gate
+    // directly. Keep only non-negative integers; a non-array falls back to the
+    // default []. Mirrors the guestMode sanitization above.
+    const adminGroups = Array.isArray(partial.adminGroups)
+      ? partial.adminGroups.filter(
+          (g): g is number => typeof g === "number" && Number.isInteger(g) && g >= 0,
+        )
+      : defaults.adminGroups;
+
+    const partialSp = (partial.spotify ?? {}) as Partial<SpotifyConfig>;
+    const validBackends = ["auto", "go-librespot", "librespot"] as const;
+    const validBitrates = [96, 160, 320];
+    const spotify: SpotifyConfig = {
+      enabled: partialSp.enabled === true,
+      backend: (validBackends as readonly string[]).includes(partialSp.backend as string)
+        ? (partialSp.backend as SpotifyConfig["backend"])
+        : defaults.spotify.backend,
+      clientId: typeof partialSp.clientId === "string" ? partialSp.clientId : defaults.spotify.clientId,
+      clientSecret:
+        typeof partialSp.clientSecret === "string" ? partialSp.clientSecret : defaults.spotify.clientSecret,
+      deviceName:
+        typeof partialSp.deviceName === "string" && partialSp.deviceName.trim()
+          ? partialSp.deviceName
+          : defaults.spotify.deviceName,
+      bitrate: validBitrates.includes(partialSp.bitrate as number)
+        ? (partialSp.bitrate as number)
+        : defaults.spotify.bitrate,
+    };
+
+    // Sanitize the jellyfin block on load, mirroring the spotify handling: a
+    // hand-edited/legacy config.json must never smuggle wrong shapes past the
+    // gate. Unknown/invalid sub-fields fall back to defaults.
+    const partialJf = (partial.jellyfin ?? {}) as Partial<JellyfinConfig>;
+    const jellyfin: JellyfinConfig = {
+      serverUrl:
+        typeof partialJf.serverUrl === "string"
+          ? partialJf.serverUrl.trim().replace(/\/+$/, "")
+          : defaults.jellyfin.serverUrl,
+      authMode:
+        partialJf.authMode === "apikey" ? "apikey" : defaults.jellyfin.authMode,
+      username:
+        typeof partialJf.username === "string" ? partialJf.username : defaults.jellyfin.username,
+      password:
+        typeof partialJf.password === "string" ? partialJf.password : defaults.jellyfin.password,
+      apiKey: typeof partialJf.apiKey === "string" ? partialJf.apiKey : defaults.jellyfin.apiKey,
+      userId: typeof partialJf.userId === "string" ? partialJf.userId : defaults.jellyfin.userId,
+    };
+
+    // enabledProviders → known providers only; a non-array falls back to the
+    // default (online sources, jellyfin off). An explicitly-empty array is
+    // respected (operator chose to disable every gateable source).
+    const enabledProviders = Array.isArray(partial.enabledProviders)
+      ? partial.enabledProviders.filter((p): p is GateableProvider =>
+          (GATEABLE_PROVIDERS as readonly string[]).includes(p as string),
+        )
+      : defaults.enabledProviders;
+
+    // Strict-coerce the two feature flags exactly like spotify.enabled so a
+    // hand-edited / legacy / corrupt config.json can never silently enable
+    // them (`"yes"`, `1`, `null` → false; only a literal `true` enables).
+    const savedQueuesEnabled = partial.savedQueuesEnabled === true;
+    const playKeepsQueue = partial.playKeepsQueue === true;
+
+    // Voice ducking is opt-in and the retained-volume percentage is consumed
+    // directly by the audio path. Only a plain-object block with correctly
+    // typed, finite and in-range fields may override the safe defaults.
+    const rawVoiceDucking = partial.voiceDucking;
+    const partialVoiceDucking =
+      rawVoiceDucking !== null &&
+      typeof rawVoiceDucking === "object" &&
+      !Array.isArray(rawVoiceDucking)
+        ? (rawVoiceDucking as Partial<VoiceDuckingConfig>)
+        : {};
+    const rawVolumePercent = partialVoiceDucking.volumePercent;
+    const voiceDucking: VoiceDuckingConfig = {
+      enabled:
+        typeof partialVoiceDucking.enabled === "boolean"
+          ? partialVoiceDucking.enabled
+          : defaults.voiceDucking.enabled,
+      volumePercent:
+        typeof rawVolumePercent === "number" &&
+        Number.isFinite(rawVolumePercent) &&
+        rawVolumePercent >= 0 &&
+        rawVolumePercent <= 100
+          ? rawVolumePercent
+          : defaults.voiceDucking.volumePercent,
+    };
+
+    // defaultPlatform → an explicit operator default (issue #126). Keep it only
+    // when it names a KNOWN gateable provider that is ALSO currently enabled;
+    // anything else (unknown value, disabled source, wrong type, missing) becomes
+    // null so defaultPlatform() falls back to the fixed priority order.
+    const rawDefault = partial.defaultPlatform;
+    const defaultPlatformPref: GateableProvider | null =
+      typeof rawDefault === "string" &&
+      (GATEABLE_PROVIDERS as readonly string[]).includes(rawDefault) &&
+      enabledProviders.includes(rawDefault as GateableProvider)
+        ? (rawDefault as GateableProvider)
+        : null;
+
+    // audioQuality → per-provider strings; each field falls back to its default
+    // when missing/blank/non-string (a hand-edited/legacy config must never smuggle
+    // a non-string past the gate — the value is fed straight to provider.setQuality).
+    const partialAq = (partial.audioQuality ?? {}) as Partial<AudioQualityConfig>;
+    const coerceQuality = (v: unknown, fallback: string): string =>
+      typeof v === "string" && v.trim() ? v : fallback;
+    const audioQuality: AudioQualityConfig = {
+      netease: coerceQuality(partialAq.netease, defaults.audioQuality.netease),
+      qq: coerceQuality(partialAq.qq, defaults.audioQuality.qq),
+      bilibili: coerceQuality(partialAq.bilibili, defaults.audioQuality.bilibili),
+      kugou: coerceQuality(partialAq.kugou, defaults.audioQuality.kugou),
+      jellyfin: coerceQuality(partialAq.jellyfin, defaults.audioQuality.jellyfin),
+    };
+
+    return {
+      ...defaults,
+      ...partial,
+      adminGroups,
+      guestMode: gm,
+      spotify,
+      jellyfin,
+      audioQuality,
+      enabledProviders,
+      savedQueuesEnabled,
+      playKeepsQueue,
+      voiceDucking,
+      defaultPlatform: defaultPlatformPref,
+    };
+  }
 }
 
 export function saveConfig(path: string, config: BotConfig): void {
   mkdirSync(dirname(path), { recursive: true });
-  writeFileSync(path, JSON.stringify(config, null, 2), "utf-8");
+  const json = JSON.stringify(config, null, 2);
+
+  // Atomic write: serialize to a sibling temp file in the SAME directory, then
+  // rename it onto the final path. rename is an atomic replace on POSIX and modern
+  // Windows, so a crash / power loss / ENOSPC mid-write can never leave config.json
+  // truncated — a reader always sees either the previous file or the fully-written
+  // new one, never a partial. The temp lives in the same dir so the rename stays on
+  // one filesystem (a cross-device rename would fail); pid + timestamp keep
+  // concurrent writers from colliding on the temp name.
+  const tmp = `${path}.${process.pid}.${Date.now()}.tmp`;
+  try {
+    writeFileSync(tmp, json, "utf-8");
+    renameSync(tmp, path);
+  } catch (err) {
+    // Never leave a partial temp file behind on failure.
+    try {
+      rmSync(tmp, { force: true });
+    } catch {
+      /* best-effort cleanup */
+    }
+    throw err;
+  }
+}
+
+/**
+ * One-time migration for the config location fix (#86).
+ *
+ * Older versions wrote config.json to the app/repo ROOT, which is NOT inside the
+ * persisted data directory (the Docker volume is mounted at data/). That meant the
+ * file never landed in the volume on first run and a manually-placed data/config.json
+ * was ignored. config.json now lives under the data dir alongside the DB/cookies/logs.
+ *
+ * If a legacy root-level config exists and the new data-dir config does not yet exist,
+ * move it so existing local installs keep their customized settings. Best-effort:
+ * any failure is swallowed and loadConfig falls back to defaults.
+ *
+ * @returns true if a legacy config was migrated, false otherwise.
+ */
+export function migrateLegacyConfig(legacyPath: string, newPath: string): boolean {
+  try {
+    if (legacyPath === newPath) return false;
+    if (existsSync(newPath)) return false; // new location already populated — leave it
+    if (!existsSync(legacyPath)) return false; // nothing to migrate
+    mkdirSync(dirname(newPath), { recursive: true });
+    copyFileSync(legacyPath, newPath); // copy first (works across filesystems)
+    try {
+      rmSync(legacyPath);
+    } catch {
+      /* leave the legacy file if it can't be removed; the new one wins */
+    }
+    return true;
+  } catch {
+    return false;
+  }
 }

src/data/database.test.ts

@@ -1,5 +1,9 @@
+import { mkdtempSync, rmSync } from "node:fs";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
 import { describe, it, expect, beforeEach, afterEach } from "vitest";
-import { createDatabase, type BotDatabase, type BotInstance, type PlayHistoryEntry } from "./database.js";
+import { createDatabase, SHARED_QUEUE_OWNER, type BotDatabase, type BotInstance, type PlayHistoryEntry } from "./database.js";
+import { createUserStore, GUEST_USER_ID } from "./users.js";
 
 describe("database", () => {
   let botDb: BotDatabase;
@@ -56,6 +60,7 @@ describe("database", () => {
       album: "Test Album",
       platform: "netease",
       coverUrl: "https://example.com/cover.jpg",
+      requestedBy: "alice",
     });
 
     botDb.addPlayHistory({
@@ -72,6 +77,7 @@ describe("database", () => {
     expect(history).toHaveLength(2);
     expect(history[0].songName).toBe("Another Song");
     expect(history[1].songName).toBe("Test Song");
+    expect(history[1].requestedBy).toBe("alice");
   });
 
   it("saves and loads bot instances", () => {
@@ -82,6 +88,7 @@ describe("database", () => {
       serverPort: 9987,
       nickname: "MusicBot",
       defaultChannel: "Music",
+      channelId: "",
       channelPassword: "",
       autoStart: true,
       serverProtocol: "",
@@ -111,6 +118,7 @@ describe("database", () => {
       serverPort: 9987,
       nickname: "MusicBot",
       defaultChannel: "Music",
+      channelId: "",
       channelPassword: "",
       autoStart: false,
       serverProtocol: "",
@@ -123,6 +131,92 @@ describe("database", () => {
     expect(botDb.deleteBotInstance("nonexistent")).toBe(false);
   });
 
+  it("persists and restores per-bot player settings (volume + play mode) (#125)", () => {
+    const inst = {
+      id: "bot-ps",
+      name: "B",
+      serverAddress: "x",
+      serverPort: 9987,
+      nickname: "n",
+      defaultChannel: "",
+      channelId: "",
+      channelPassword: "",
+      autoStart: false,
+      serverProtocol: "",
+      ts6ApiKey: "",
+      serverPassword: "",
+    };
+    botDb.saveBotInstance(inst);
+
+    // Fresh row → in-memory defaults.
+    expect(botDb.getPlayerSettings("bot-ps")).toEqual({ volume: 75, playMode: "seq" });
+
+    // Volume and play mode persist independently.
+    botDb.saveVolume("bot-ps", 42);
+    expect(botDb.getPlayerSettings("bot-ps")).toEqual({ volume: 42, playMode: "seq" });
+    botDb.savePlayMode("bot-ps", "rloop");
+    expect(botDb.getPlayerSettings("bot-ps")).toEqual({ volume: 42, playMode: "rloop" });
+
+    // A later saveBotInstance upsert (e.g. autoStart toggle) must NOT reset them.
+    botDb.saveBotInstance({ ...inst, autoStart: true });
+    expect(botDb.getPlayerSettings("bot-ps")).toEqual({ volume: 42, playMode: "rloop" });
+  });
+
+  it("defaults player settings for an unknown bot and validates inputs (#125)", () => {
+    // No row → defaults.
+    expect(botDb.getPlayerSettings("does-not-exist")).toEqual({ volume: 75, playMode: "seq" });
+
+    botDb.saveBotInstance({
+      id: "bot-v",
+      name: "B",
+      serverAddress: "x",
+      serverPort: 9987,
+      nickname: "n",
+      defaultChannel: "",
+      channelId: "",
+      channelPassword: "",
+      autoStart: false,
+      serverProtocol: "",
+      ts6ApiKey: "",
+      serverPassword: "",
+    });
+    // Out-of-range volume is clamped; an unknown play mode is ignored (not stored).
+    botDb.saveVolume("bot-v", 250);
+    expect(botDb.getPlayerSettings("bot-v").volume).toBe(100);
+    botDb.saveVolume("bot-v", -10);
+    expect(botDb.getPlayerSettings("bot-v").volume).toBe(0);
+    botDb.savePlayMode("bot-v", "bogus");
+    expect(botDb.getPlayerSettings("bot-v").playMode).toBe("seq");
+  });
+
+  it("migrates volume + play_mode columns onto a legacy bot_instances table (#125)", () => {
+    const dir = mkdtempSync(join(tmpdir(), "tsmb-mig-"));
+    const p = join(dir, "legacy.db");
+    // Build a minimal pre-#125 bot_instances table (no volume/play_mode columns).
+    const legacy = createDatabase(p);
+    legacy.db.exec("DROP TABLE bot_instances");
+    legacy.db.exec(`CREATE TABLE bot_instances (
+      id TEXT PRIMARY KEY, name TEXT NOT NULL, serverAddress TEXT NOT NULL,
+      serverPort INTEGER NOT NULL, nickname TEXT NOT NULL, defaultChannel TEXT NOT NULL,
+      channelId TEXT NOT NULL DEFAULT '', channelPassword TEXT NOT NULL,
+      autoStart INTEGER NOT NULL DEFAULT 0, serverProtocol TEXT NOT NULL DEFAULT '',
+      ts6ApiKey TEXT NOT NULL DEFAULT '', serverPassword TEXT NOT NULL DEFAULT '', identity TEXT
+    )`);
+    legacy.db
+      .prepare("INSERT INTO bot_instances (id, name, serverAddress, serverPort, nickname, defaultChannel, channelPassword) VALUES (?, 'B', 'x', 9987, 'n', '', '')")
+      .run("legacy-bot");
+    legacy.close();
+
+    // Reopen → migrateSchema adds the columns; the old row gets the defaults.
+    const reopened = createDatabase(p);
+    const cols = (reopened.db.prepare("PRAGMA table_info(bot_instances)").all() as Array<{ name: string }>).map((c) => c.name);
+    expect(cols).toContain("volume");
+    expect(cols).toContain("play_mode");
+    expect(reopened.getPlayerSettings("legacy-bot")).toEqual({ volume: 75, playMode: "seq" });
+    reopened.close();
+    rmSync(dir, { recursive: true, force: true });
+  });
+
   it("persists and clears customAvatarPath on a bot instance", () => {
     const inst = {
       id: "bot-1",
@@ -131,6 +225,7 @@ describe("database", () => {
       serverPort: 9987,
       nickname: "n",
       defaultChannel: "",
+      channelId: "",
       channelPassword: "",
       autoStart: false,
       serverProtocol: "",
@@ -144,4 +239,109 @@ describe("database", () => {
     botDb.setCustomAvatarPath("bot-1", null);
     expect(botDb.getCustomAvatarPath("bot-1")).toBeNull();
   });
+
+  const sq = (id: string) => ({
+    id,
+    name: id,
+    artist: "",
+    album: "",
+    platform: "netease" as const,
+    coverUrl: "",
+    duration: 1,
+  });
+
+  describe("saved_queues", () => {
+    it("upserts by (ownerId, name) and returns songs", () => {
+      botDb.saveQueue("u1", "night", [sq("a"), sq("b")]);
+      const again = botDb.saveQueue("u1", "night", [sq("c")]); // overwrite
+      expect(again.songCount).toBe(1);
+      expect(botDb.listSavedQueues("u1", false)).toHaveLength(1);
+      const full = botDb.getSavedQueue(again.id)!;
+      expect(full.songs.map((s) => s.id)).toEqual(["c"]);
+    });
+
+    it("strips url before persisting", () => {
+      const saved = botDb.saveQueue("u1", "x", [
+        { ...sq("a"), url: "http://example.com/a.mp3" } as never,
+      ]);
+      const full = botDb.getSavedQueue(saved.id)!;
+      expect((full.songs[0] as { url?: string }).url).toBeUndefined();
+    });
+
+    it("lists own + shared when includeShared, own-only otherwise", () => {
+      botDb.saveQueue("u1", "mine", [sq("a")]);
+      botDb.saveQueue(SHARED_QUEUE_OWNER, "party", [sq("b")]);
+      expect(botDb.listSavedQueues("u1", false).map((q) => q.name)).toEqual(["mine"]);
+      expect(
+        botDb.listSavedQueues("u1", true).map((q) => q.name).sort(),
+      ).toEqual(["mine", "party"]);
+    });
+
+    it("caps songs at 1000 and queues at 50", () => {
+      expect(() =>
+        botDb.saveQueue("u1", "big", Array.from({ length: 1001 }, (_, i) => sq("s" + i))),
+      ).toThrow(/1000/);
+      for (let i = 0; i < 50; i++) botDb.saveQueue("u1", "q" + i, [sq("a")]);
+      expect(() => botDb.saveQueue("u1", "q50", [sq("a")])).toThrow(/50/);
+      // Overwriting an existing name is always allowed despite the cap.
+      expect(() => botDb.saveQueue("u1", "q0", [sq("z")])).not.toThrow();
+    });
+
+    it("deletes and degrades a corrupt blob to empty", () => {
+      const q = botDb.saveQueue("u1", "x", [sq("a")]);
+      botDb.db.prepare("UPDATE saved_queues SET songs='not json' WHERE id=?").run(q.id);
+      expect(botDb.getSavedQueue(q.id)!.songs).toEqual([]);
+      expect(botDb.deleteSavedQueue(q.id)).toBe(true);
+      expect(botDb.getSavedQueue(q.id)).toBeNull();
+      expect(botDb.deleteSavedQueue(q.id)).toBe(false); // already gone
+    });
+  });
+
+  describe("queue_state", () => {
+    it("upserts, reads back, and clears per bot", () => {
+      botDb.saveQueueState({ botId: "b1", songs: [sq("a")], currentIndex: 0, mode: "loop", isFmMode: true, fmPlatform: "netease" });
+      botDb.saveQueueState({ botId: "b1", songs: [sq("a"), sq("b")], currentIndex: 1, mode: "seq", isFmMode: false, fmPlatform: "" });
+      const st = botDb.getQueueState("b1")!;
+      expect(st.songs.map((s) => s.id)).toEqual(["a", "b"]);
+      expect(st.currentIndex).toBe(1);
+      expect(st.mode).toBe("seq");
+      expect(st.isFmMode).toBe(false);
+      botDb.clearQueueState("b1");
+      expect(botDb.getQueueState("b1")).toBeNull();
+    });
+
+    it("round-trips FM flags and degrades a corrupt blob", () => {
+      botDb.saveQueueState({ botId: "b2", songs: [sq("a")], currentIndex: 0, mode: "random", isFmMode: true, fmPlatform: "qq" });
+      const st = botDb.getQueueState("b2")!;
+      expect(st.isFmMode).toBe(true);
+      expect(st.fmPlatform).toBe("qq");
+      botDb.db.prepare("UPDATE queue_state SET songs='{' WHERE botId=?").run("b2");
+      expect(botDb.getQueueState("b2")!.songs).toEqual([]);
+    });
+  });
+});
+
+describe("guest principal migration", () => {
+  it("creates exactly one reserved guest row, idempotently", () => {
+    const dir = mkdtempSync(join(tmpdir(), "tsmb-db-"));
+    const p = join(dir, "t.db");
+    const a = createDatabase(p); a.db.close();
+    const b = createDatabase(p); // run again — must not duplicate
+    const row = b.db.prepare("SELECT id, role FROM users WHERE id = ?").get(GUEST_USER_ID) as { id: string; role: string } | undefined;
+    expect(row?.role).toBe("guest");
+    const n = (b.db.prepare("SELECT COUNT(*) AS n FROM users WHERE role='guest'").get() as { n: number }).n;
+    expect(n).toBe(1);
+    b.db.close();
+    rmSync(dir, { recursive: true, force: true });
+  });
+
+  it("guest row does not break first-run detection (countUsers excludes it)", () => {
+    const dir = mkdtempSync(join(tmpdir(), "tsmb-db2-"));
+    const p = join(dir, "t.db");
+    const d = createDatabase(p);
+    const users = createUserStore(d.db);
+    expect(users.countUsers()).toBe(0); // guest excluded → still needs setup
+    d.db.close();
+    rmSync(dir, { recursive: true, force: true });
+  });
 });

src/data/database.ts

@@ -1,5 +1,46 @@
 import Database from "better-sqlite3";
 import { CAPABILITIES, BOTS_ALL } from "./permissions.js";
+import { GUEST_USER_ID, GUEST_USERNAME } from "./users.js";
+import type { QueuedSong } from "../audio/queue.js";
+
+/**
+ * Reserved owner id for chat-saved / opt-in-shared queues. A `__`-bracketed
+ * literal can never collide with a real WebUI user id (UUIDs), so it cleanly
+ * partitions "shared" saved queues from per-user private ones (issue #119).
+ */
+export const SHARED_QUEUE_OWNER = "__shared__";
+/** Cap per owner (private user OR the shared bucket). */
+export const MAX_SAVED_QUEUES = 50;
+/** Cap per saved queue / persisted live-queue snapshot. */
+export const MAX_QUEUE_SONGS = 1000;
+
+/** A stored song is a QueuedSong minus the lazily-resolved `url`. */
+export type StoredSong = Omit<QueuedSong, "url">;
+
+/** Saved-queue row without the (potentially large) songs blob — for list views. */
+export interface SavedQueueMeta {
+  id: number;
+  ownerId: string;
+  name: string;
+  songCount: number;
+  createdAt: string;
+  updatedAt: string;
+}
+
+/** Full saved queue, including its songs. */
+export interface SavedQueue extends SavedQueueMeta {
+  songs: StoredSong[];
+}
+
+/** One-row-per-bot persisted live-queue state (Feature 2, auto-restore). */
+export interface QueueStateRow {
+  botId: string;
+  songs: StoredSong[];
+  currentIndex: number;
+  mode: string;
+  isFmMode: boolean;
+  fmPlatform: string;
+}
 
 export interface PlayHistoryEntry {
   botId: string;
@@ -7,8 +48,9 @@ export interface PlayHistoryEntry {
   songName: string;
   artist: string;
   album: string;
-  platform: "netease" | "qq" | "bilibili" | "youtube";
+  platform: "netease" | "qq" | "bilibili" | "youtube" | "local" | "kugou" | "spotify" | "jellyfin";
   coverUrl: string;
+  requestedBy?: string;
 }
 
 export interface PlayHistoryRecord extends PlayHistoryEntry {
@@ -23,6 +65,7 @@ export interface BotInstance {
   serverPort: number;
   nickname: string;
   defaultChannel: string;
+  channelId: string;
   channelPassword: string;
   autoStart: boolean;
   /** "ts3" | "ts6" | "" (empty = auto-detect) */
@@ -52,6 +95,37 @@ export const DEFAULT_PROFILE_CONFIG: ProfileConfig = {
   nowPlayingMsgEnabled: true,
 };
 
+/**
+ * Per-bot player settings persisted across restarts (#125): the playback volume
+ * and play mode. These reset to defaults on process restart when kept only in
+ * memory (AudioPlayer/PlayQueue), so they are stored on the bot_instances row —
+ * exactly like the per-bot profile flags — and restored when the bot is (re)built.
+ */
+export interface PlayerSettings {
+  /** 0-100. */
+  volume: number;
+  /** PlayMode string: "seq" | "loop" | "random" | "rloop". */
+  playMode: string;
+}
+
+const PLAY_MODES = new Set(["seq", "loop", "random", "rloop"]);
+
+export const DEFAULT_PLAYER_SETTINGS: PlayerSettings = {
+  volume: 75,
+  playMode: "seq",
+};
+
+export interface FavoritePlaylist {
+  id: number;
+  userId: string;
+  platform: string;
+  playlistId: string;
+  name: string;
+  coverUrl: string;
+  songCount: number;
+  createdAt: string;
+}
+
 export interface BotDatabase {
   db: Database.Database;
   addPlayHistory(entry: PlayHistoryEntry): void;
@@ -61,8 +135,24 @@ export interface BotDatabase {
   deleteBotInstance(id: string): boolean;
   getProfileConfig(botId: string): ProfileConfig;
   saveProfileConfig(botId: string, config: ProfileConfig): void;
+  getPlayerSettings(botId: string): PlayerSettings;
+  saveVolume(botId: string, volume: number): void;
+  savePlayMode(botId: string, playMode: string): void;
   getCustomAvatarPath(botId: string): string | null;
   setCustomAvatarPath(botId: string, path: string | null): void;
+  addFavorite(userId: string, playlist: { platform: string; playlistId: string; name: string; coverUrl: string; songCount: number }): void;
+  removeFavorite(userId: string, playlistId: string, platform: string): boolean;
+  getFavorites(userId: string): FavoritePlaylist[];
+  isFavorited(userId: string, playlistId: string, platform: string): boolean;
+  // Saved queues (Feature 1) — upsert by (ownerId, name), capped.
+  saveQueue(ownerId: string, name: string, songs: StoredSong[]): SavedQueue;
+  listSavedQueues(ownerId: string, includeShared: boolean): SavedQueueMeta[];
+  getSavedQueue(id: number): SavedQueue | null;
+  deleteSavedQueue(id: number): boolean;
+  // Live-queue persistence (Feature 2) — one row per bot.
+  saveQueueState(state: QueueStateRow): void;
+  getQueueState(botId: string): QueueStateRow | null;
+  clearQueueState(botId: string): void;
   close(): void;
 }
 
@@ -81,6 +171,9 @@ function migrateSchema(db: Database.Database): void {
   if (!names.includes("serverPassword")) {
     db.exec("ALTER TABLE bot_instances ADD COLUMN serverPassword TEXT NOT NULL DEFAULT ''");
   }
+  if (!names.includes("channelId")) {
+    db.exec("ALTER TABLE bot_instances ADD COLUMN channelId TEXT NOT NULL DEFAULT ''");
+  }
   // Profile feature flags
   const profileCols = [
     "profile_avatar_enabled",
@@ -98,12 +191,27 @@ function migrateSchema(db: Database.Database): void {
   if (!names.includes("custom_avatar_path")) {
     db.exec("ALTER TABLE bot_instances ADD COLUMN custom_avatar_path TEXT");
   }
+  // Per-bot persisted player settings (#125): volume + play mode. Defaults match
+  // AudioPlayer/PlayQueue's in-memory defaults so pre-existing rows keep behaving
+  // exactly as before until the user changes them.
+  if (!names.includes("volume")) {
+    db.exec("ALTER TABLE bot_instances ADD COLUMN volume INTEGER NOT NULL DEFAULT 75");
+  }
+  if (!names.includes("play_mode")) {
+    db.exec("ALTER TABLE bot_instances ADD COLUMN play_mode TEXT NOT NULL DEFAULT 'seq'");
+  }
 
   const userColumns = db.prepare("PRAGMA table_info(users)").all() as Array<{ name: string }>;
   const userColNames = userColumns.map((c) => c.name);
   if (!userColNames.includes("role")) {
     db.exec("ALTER TABLE users ADD COLUMN role TEXT NOT NULL DEFAULT 'admin'");
   }
+
+  const historyColumns = db.prepare("PRAGMA table_info(play_history)").all() as Array<{ name: string }>;
+  const historyColNames = historyColumns.map((c) => c.name);
+  if (!historyColNames.includes("requestedBy")) {
+    db.exec("ALTER TABLE play_history ADD COLUMN requestedBy TEXT NOT NULL DEFAULT ''");
+  }
 }
 
 function initTables(db: Database.Database): void {
@@ -117,6 +225,7 @@ function initTables(db: Database.Database): void {
       album TEXT NOT NULL,
       platform TEXT NOT NULL,
       coverUrl TEXT NOT NULL,
+      requestedBy TEXT NOT NULL DEFAULT '',
       playedAt TEXT NOT NULL DEFAULT (datetime('now'))
     );
 
@@ -127,11 +236,14 @@ function initTables(db: Database.Database): void {
       serverPort INTEGER NOT NULL,
       nickname TEXT NOT NULL,
       defaultChannel TEXT NOT NULL,
+      channelId TEXT NOT NULL DEFAULT '',
       channelPassword TEXT NOT NULL,
       autoStart INTEGER NOT NULL DEFAULT 0,
       serverProtocol TEXT NOT NULL DEFAULT '',
       ts6ApiKey TEXT NOT NULL DEFAULT '',
       serverPassword TEXT NOT NULL DEFAULT '',
+      volume INTEGER NOT NULL DEFAULT 75,
+      play_mode TEXT NOT NULL DEFAULT 'seq',
       identity TEXT
     );
 
@@ -167,6 +279,20 @@ function initTables(db: Database.Database): void {
     );
     CREATE INDEX IF NOT EXISTS idx_user_audit_timestamp ON user_audit(timestamp DESC);
 
+    CREATE TABLE IF NOT EXISTS favorite_playlists (
+      id INTEGER PRIMARY KEY AUTOINCREMENT,
+      userId TEXT NOT NULL,
+      platform TEXT NOT NULL,
+      playlistId TEXT NOT NULL,
+      name TEXT NOT NULL,
+      coverUrl TEXT NOT NULL DEFAULT '',
+      songCount INTEGER NOT NULL DEFAULT 0,
+      createdAt TEXT NOT NULL DEFAULT (datetime('now')),
+      FOREIGN KEY (userId) REFERENCES users(id) ON DELETE CASCADE,
+      UNIQUE(userId, platform, playlistId)
+    );
+    CREATE INDEX IF NOT EXISTS idx_favorites_userId ON favorite_playlists(userId);
+
     CREATE TABLE IF NOT EXISTS user_permissions (
       userId     TEXT NOT NULL,
       permission TEXT NOT NULL,
@@ -180,6 +306,28 @@ function initTables(db: Database.Database): void {
       FOREIGN KEY (userId) REFERENCES users(id) ON DELETE CASCADE
     );
     CREATE INDEX IF NOT EXISTS idx_user_bot_access_userId ON user_bot_access(userId);
+
+    CREATE TABLE IF NOT EXISTS saved_queues (
+      id        INTEGER PRIMARY KEY AUTOINCREMENT,
+      ownerId   TEXT NOT NULL,
+      name      TEXT NOT NULL,
+      songs     TEXT NOT NULL,
+      songCount INTEGER NOT NULL DEFAULT 0,
+      createdAt TEXT NOT NULL DEFAULT (datetime('now')),
+      updatedAt TEXT NOT NULL DEFAULT (datetime('now')),
+      UNIQUE(ownerId, name)
+    );
+    CREATE INDEX IF NOT EXISTS idx_saved_queues_ownerId ON saved_queues(ownerId);
+
+    CREATE TABLE IF NOT EXISTS queue_state (
+      botId        TEXT PRIMARY KEY,
+      songs        TEXT NOT NULL,
+      currentIndex INTEGER NOT NULL,
+      mode         TEXT NOT NULL,
+      isFmMode     INTEGER NOT NULL DEFAULT 0,
+      fmPlatform   TEXT NOT NULL DEFAULT '',
+      updatedAt    TEXT NOT NULL DEFAULT (datetime('now'))
+    );
   `);
 }
 
@@ -207,6 +355,19 @@ export function backfillMemberPermissions(db: Database.Database): void {
   tx();
 }
 
+/**
+ * Ensure the reserved guest principal exists. Idempotent via the PK on
+ * `users.id`. This row only backs login-less guest sessions; it is excluded
+ * from countUsers()/listUsers() so it never interferes with first-run setup
+ * or the user-management UI, and holds an unusable password hash.
+ */
+export function ensureGuestUser(db: Database.Database): void {
+  const now = Date.now();
+  db.prepare(
+    "INSERT OR IGNORE INTO users (id, username, passwordHash, createdAt, updatedAt, role) VALUES (?, ?, '!', ?, ?, 'guest')"
+  ).run(GUEST_USER_ID, GUEST_USERNAME, now, now);
+}
+
 export function createDatabase(dbPath: string): BotDatabase {
   const db = new Database(dbPath);
   db.pragma("journal_mode = WAL");
@@ -214,10 +375,11 @@ export function createDatabase(dbPath: string): BotDatabase {
   initTables(db);
   migrateSchema(db);
   backfillMemberPermissions(db);
+  ensureGuestUser(db);
 
   const insertHistory = db.prepare(`
-    INSERT INTO play_history (botId, songId, songName, artist, album, platform, coverUrl)
-    VALUES (@botId, @songId, @songName, @artist, @album, @platform, @coverUrl)
+    INSERT INTO play_history (botId, songId, songName, artist, album, platform, coverUrl, requestedBy)
+    VALUES (@botId, @songId, @songName, @artist, @album, @platform, @coverUrl, @requestedBy)
   `);
 
   const selectHistory = db.prepare(`
@@ -225,14 +387,15 @@ export function createDatabase(dbPath: string): BotDatabase {
   `);
 
   const upsertInstance = db.prepare(`
-    INSERT INTO bot_instances (id, name, serverAddress, serverPort, nickname, defaultChannel, channelPassword, autoStart, serverProtocol, ts6ApiKey, serverPassword, identity)
-    VALUES (@id, @name, @serverAddress, @serverPort, @nickname, @defaultChannel, @channelPassword, @autoStart, @serverProtocol, @ts6ApiKey, @serverPassword, @identity)
+    INSERT INTO bot_instances (id, name, serverAddress, serverPort, nickname, defaultChannel, channelId, channelPassword, autoStart, serverProtocol, ts6ApiKey, serverPassword, identity)
+    VALUES (@id, @name, @serverAddress, @serverPort, @nickname, @defaultChannel, @channelId, @channelPassword, @autoStart, @serverProtocol, @ts6ApiKey, @serverPassword, @identity)
     ON CONFLICT(id) DO UPDATE SET
       name = excluded.name,
       serverAddress = excluded.serverAddress,
       serverPort = excluded.serverPort,
       nickname = excluded.nickname,
       defaultChannel = excluded.defaultChannel,
+      channelId = excluded.channelId,
       channelPassword = excluded.channelPassword,
       autoStart = excluded.autoStart,
       serverProtocol = excluded.serverProtocol,
@@ -263,14 +426,99 @@ export function createDatabase(dbPath: string): BotDatabase {
     WHERE id = @id
   `);
 
+  const selectPlayerSettings = db.prepare(
+    `SELECT volume, play_mode FROM bot_instances WHERE id = ?`,
+  );
+  const updateVolume = db.prepare(`UPDATE bot_instances SET volume = ? WHERE id = ?`);
+  const updatePlayMode = db.prepare(`UPDATE bot_instances SET play_mode = ? WHERE id = ?`);
+
   const selectCustomAvatar = db.prepare(`SELECT custom_avatar_path FROM bot_instances WHERE id = ?`);
   const updateCustomAvatar = db.prepare(`UPDATE bot_instances SET custom_avatar_path = ? WHERE id = ?`);
 
+  const insertFavorite = db.prepare(`
+    INSERT INTO favorite_playlists (userId, platform, playlistId, name, coverUrl, songCount)
+    VALUES (@userId, @platform, @playlistId, @name, @coverUrl, @songCount)
+  `);
+
+  const deleteFavorite = db.prepare(`
+    DELETE FROM favorite_playlists WHERE userId = ? AND playlistId = ? AND platform = ?
+  `);
+
+  const selectFavorites = db.prepare(`
+    SELECT id, userId, platform, playlistId, name, coverUrl, songCount, createdAt
+    FROM favorite_playlists WHERE userId = ? ORDER BY createdAt DESC
+  `);
+
+  const checkFavorited = db.prepare(`
+    SELECT 1 FROM favorite_playlists WHERE userId = ? AND playlistId = ? AND platform = ?
+  `);
+
+  // A corrupt/hand-edited songs blob must never throw into a route or the
+  // restore path — degrade to an empty list instead.
+  const parseSongs = (raw: string): StoredSong[] => {
+    try {
+      const v = JSON.parse(raw);
+      return Array.isArray(v) ? (v as StoredSong[]) : [];
+    } catch {
+      return [];
+    }
+  };
+  const rowToSavedMeta = (r: {
+    id: number; ownerId: string; name: string; songCount: number; createdAt: string; updatedAt: string;
+  }): SavedQueueMeta => ({
+    id: r.id,
+    ownerId: r.ownerId,
+    name: r.name,
+    songCount: r.songCount,
+    createdAt: r.createdAt,
+    updatedAt: r.updatedAt,
+  });
+
+  const upsertSavedQueue = db.prepare(`
+    INSERT INTO saved_queues (ownerId, name, songs, songCount)
+    VALUES (@ownerId, @name, @songs, @songCount)
+    ON CONFLICT(ownerId, name) DO UPDATE SET
+      songs = excluded.songs,
+      songCount = excluded.songCount,
+      updatedAt = datetime('now')
+  `);
+  const selectSavedQueueByOwnerName = db.prepare(
+    "SELECT * FROM saved_queues WHERE ownerId = ? AND name = ?",
+  );
+  const selectSavedQueueIdByOwnerName = db.prepare(
+    "SELECT id FROM saved_queues WHERE ownerId = ? AND name = ?",
+  );
+  const countSavedQueues = db.prepare(
+    "SELECT COUNT(*) AS c FROM saved_queues WHERE ownerId = ?",
+  );
+  const listSavedQueuesOwn = db.prepare(
+    "SELECT id, ownerId, name, songCount, createdAt, updatedAt FROM saved_queues WHERE ownerId = ? ORDER BY updatedAt DESC",
+  );
+  const listSavedQueuesShared = db.prepare(
+    "SELECT id, ownerId, name, songCount, createdAt, updatedAt FROM saved_queues WHERE ownerId = ? OR ownerId = ? ORDER BY updatedAt DESC",
+  );
+  const selectSavedQueueById = db.prepare("SELECT * FROM saved_queues WHERE id = ?");
+  const deleteSavedQueueById = db.prepare("DELETE FROM saved_queues WHERE id = ?");
+
+  const upsertQueueState = db.prepare(`
+    INSERT INTO queue_state (botId, songs, currentIndex, mode, isFmMode, fmPlatform, updatedAt)
+    VALUES (@botId, @songs, @currentIndex, @mode, @isFmMode, @fmPlatform, datetime('now'))
+    ON CONFLICT(botId) DO UPDATE SET
+      songs = excluded.songs,
+      currentIndex = excluded.currentIndex,
+      mode = excluded.mode,
+      isFmMode = excluded.isFmMode,
+      fmPlatform = excluded.fmPlatform,
+      updatedAt = datetime('now')
+  `);
+  const selectQueueState = db.prepare("SELECT * FROM queue_state WHERE botId = ?");
+  const deleteQueueState = db.prepare("DELETE FROM queue_state WHERE botId = ?");
+
   return {
     db,
 
     addPlayHistory(record) {
-      insertHistory.run(record);
+      insertHistory.run({ ...record, requestedBy: record.requestedBy ?? "" });
     },
 
     getPlayHistory(botId, limit) {
@@ -295,6 +543,7 @@ export function createDatabase(dbPath: string): BotDatabase {
         serverProtocol: r.serverProtocol ?? "",
         ts6ApiKey: r.ts6ApiKey ?? "",
         serverPassword: r.serverPassword ?? "",
+        channelId: r.channelId ?? "",
         identity: r.identity ?? undefined,
       }));
     },
@@ -329,6 +578,36 @@ export function createDatabase(dbPath: string): BotDatabase {
       });
     },
 
+    getPlayerSettings(botId) {
+      const row = selectPlayerSettings.get(botId) as
+        | { volume: number | null; play_mode: string | null }
+        | undefined;
+      if (!row) return { ...DEFAULT_PLAYER_SETTINGS };
+      // Coerce/validate: clamp volume to 0-100 and fall back to defaults for any
+      // NULL / out-of-range / unknown value (a hand-edited DB must never feed a
+      // bad value into AudioPlayer.setVolume / PlayQueue.setMode).
+      const rawVol = typeof row.volume === "number" ? row.volume : DEFAULT_PLAYER_SETTINGS.volume;
+      const volume = Number.isFinite(rawVol)
+        ? Math.max(0, Math.min(100, Math.round(rawVol)))
+        : DEFAULT_PLAYER_SETTINGS.volume;
+      const playMode =
+        typeof row.play_mode === "string" && PLAY_MODES.has(row.play_mode)
+          ? row.play_mode
+          : DEFAULT_PLAYER_SETTINGS.playMode;
+      return { volume, playMode };
+    },
+
+    saveVolume(botId, volume) {
+      const clamped = Math.max(0, Math.min(100, Math.round(volume)));
+      updateVolume.run(clamped, botId);
+    },
+
+    savePlayMode(botId, playMode) {
+      // Persist only recognized modes so a bad value can never poison the row.
+      if (!PLAY_MODES.has(playMode)) return;
+      updatePlayMode.run(playMode, botId);
+    },
+
     getCustomAvatarPath(botId) {
       const row = selectCustomAvatar.get(botId) as { custom_avatar_path: string | null } | undefined;
       return row?.custom_avatar_path ?? null;
@@ -337,6 +616,103 @@ export function createDatabase(dbPath: string): BotDatabase {
       updateCustomAvatar.run(path, botId);
     },
 
+    addFavorite(userId, playlist) {
+      insertFavorite.run({ userId, ...playlist });
+    },
+
+    removeFavorite(userId, playlistId, platform) {
+      const result = deleteFavorite.run(userId, playlistId, platform);
+      return result.changes > 0;
+    },
+
+    getFavorites(userId) {
+      return selectFavorites.all(userId) as FavoritePlaylist[];
+    },
+
+    isFavorited(userId, playlistId, platform) {
+      const row = checkFavorited.get(userId, playlistId, platform);
+      return row !== undefined;
+    },
+
+    saveQueue(ownerId, name, songs) {
+      if (songs.length > MAX_QUEUE_SONGS) {
+        throw new Error(`保存失败：歌曲数量超过上限 ${MAX_QUEUE_SONGS}`);
+      }
+      // Strip any lazily-resolved url before persisting.
+      const stripped: StoredSong[] = songs.map((s) => {
+        const { url: _url, ...rest } = s as QueuedSong;
+        return rest;
+      });
+      // Enforce the per-owner cap only for a NEW name (an overwrite of an
+      // existing saved queue must always be allowed).
+      const existing = selectSavedQueueIdByOwnerName.get(ownerId, name) as
+        | { id: number }
+        | undefined;
+      if (!existing) {
+        const { c } = countSavedQueues.get(ownerId) as { c: number };
+        if (c >= MAX_SAVED_QUEUES) {
+          throw new Error(`保存失败：已保存队列数量超过上限 ${MAX_SAVED_QUEUES}`);
+        }
+      }
+      upsertSavedQueue.run({
+        ownerId,
+        name,
+        songs: JSON.stringify(stripped),
+        songCount: stripped.length,
+      });
+      const row = selectSavedQueueByOwnerName.get(ownerId, name) as SavedQueueMeta;
+      return { ...rowToSavedMeta(row), songs: stripped };
+    },
+
+    listSavedQueues(ownerId, includeShared) {
+      const rows = includeShared
+        ? (listSavedQueuesShared.all(ownerId, SHARED_QUEUE_OWNER) as SavedQueueMeta[])
+        : (listSavedQueuesOwn.all(ownerId) as SavedQueueMeta[]);
+      return rows.map(rowToSavedMeta);
+    },
+
+    getSavedQueue(id) {
+      const row = selectSavedQueueById.get(id) as
+        | (SavedQueueMeta & { songs: string })
+        | undefined;
+      if (!row) return null;
+      return { ...rowToSavedMeta(row), songs: parseSongs(row.songs) };
+    },
+
+    deleteSavedQueue(id) {
+      return deleteSavedQueueById.run(id).changes > 0;
+    },
+
+    saveQueueState(state) {
+      upsertQueueState.run({
+        botId: state.botId,
+        songs: JSON.stringify(state.songs),
+        currentIndex: state.currentIndex,
+        mode: state.mode,
+        isFmMode: state.isFmMode ? 1 : 0,
+        fmPlatform: state.fmPlatform,
+      });
+    },
+
+    getQueueState(botId) {
+      const r = selectQueueState.get(botId) as
+        | { botId: string; songs: string; currentIndex: number; mode: string; isFmMode: number; fmPlatform: string }
+        | undefined;
+      if (!r) return null;
+      return {
+        botId: r.botId,
+        songs: parseSongs(r.songs),
+        currentIndex: r.currentIndex,
+        mode: r.mode,
+        isFmMode: r.isFmMode === 1,
+        fmPlatform: r.fmPlatform,
+      };
+    },
+
+    clearQueueState(botId) {
+      deleteQueueState.run(botId);
+    },
+
     close() {
       db.close();
     },

src/data/permissions.test.ts

@@ -88,3 +88,48 @@ describe("PermissionStore", () => {
     });
   });
 });
+
+import { GUEST_PERMISSION_FLAGS } from "./permissions.js";
+
+describe("resolvePermissionContext guest branch", () => {
+  const noStore = {
+    getCapabilities: () => [],
+    getBotAccess: () => [] as string[],
+    setPermissions: () => {},
+    pruneBot: () => {},
+  };
+
+  it("guest has no member capabilities and exposes the guest permissions + bots", () => {
+    const ctx = resolvePermissionContext("guest", "__guest__", noStore, {
+      bots: ["bot1"],
+      permissions: {
+        addToQueue: true, playNext: false, playNow: false,
+        skip: true, transport: false, removeClear: false, playMode: false,
+        playCollection: false,
+      },
+    });
+    expect([...ctx.capabilities]).toEqual([]);
+    expect(ctx.bots).toBeInstanceOf(Set);
+    expect((ctx.bots as Set<string>).has("bot1")).toBe(true);
+    expect(ctx.guest?.addToQueue).toBe(true);
+    expect(ctx.guest?.skip).toBe(true);
+  });
+
+  it("guest with bots:'all' resolves to 'all'", () => {
+    const ctx = resolvePermissionContext("guest", "__guest__", noStore, {
+      bots: "all",
+      permissions: {
+        addToQueue: true, playNext: false, playNow: false,
+        skip: false, transport: false, removeClear: false, playMode: false,
+        playCollection: false,
+      },
+    });
+    expect(ctx.bots).toBe("all");
+  });
+
+  it("exposes the 8 canonical flags", () => {
+    expect([...GUEST_PERMISSION_FLAGS].sort()).toEqual(
+      ["addToQueue", "playCollection", "playMode", "playNext", "playNow", "removeClear", "skip", "transport"].sort()
+    );
+  });
+});

src/data/permissions.ts

@@ -21,6 +21,30 @@ export function isCapability(x: string): x is Capability {
 
 export type BotAccess = "all" | string[];
 
+export interface GuestPermissions {
+  addToQueue: boolean;
+  playNext: boolean;
+  playNow: boolean;
+  skip: boolean;
+  transport: boolean;
+  removeClear: boolean;
+  playMode: boolean;
+  /** Load + play an entire playlist/album (clears the queue). Issue #103. */
+  playCollection: boolean;
+}
+
+export const GUEST_PERMISSION_FLAGS = [
+  "addToQueue",
+  "playNext",
+  "playNow",
+  "skip",
+  "transport",
+  "removeClear",
+  "playMode",
+  "playCollection",
+] as const;
+export type GuestFlag = (typeof GUEST_PERMISSION_FLAGS)[number];
+
 export interface PermissionStore {
   getCapabilities(userId: string): Capability[];
   getBotAccess(userId: string): BotAccess;
@@ -71,16 +95,26 @@ export function createPermissionStore(db: Database.Database): PermissionStore {
 export interface PermissionContext {
   capabilities: Set<string>;
   bots: "all" | Set<string>;
+  guest?: GuestPermissions;
 }
 
 export function resolvePermissionContext(
-  role: "admin" | "member",
+  role: "admin" | "member" | "guest",
   userId: string,
-  store: PermissionStore
+  store: PermissionStore,
+  guest?: { bots: BotAccess; permissions: GuestPermissions }
 ): PermissionContext {
   if (role === "admin") {
     return { capabilities: new Set(CAPABILITIES), bots: "all" };
   }
+  if (role === "guest") {
+    const bots = guest?.bots ?? [];
+    return {
+      capabilities: new Set<string>(),
+      bots: bots === "all" ? "all" : new Set(bots),
+      guest: guest?.permissions,
+    };
+  }
   const access = store.getBotAccess(userId);
   return {
     capabilities: new Set(store.getCapabilities(userId)),

src/data/sessions.test.ts

@@ -2,7 +2,7 @@ import { describe, it, expect, beforeEach, afterEach, vi } from "vitest";
 import { createHash } from "node:crypto";
 import { createDatabase, type BotDatabase } from "./database.js";
 import { createUserStore, type UserStore } from "./users.js";
-import { createSessionStore, type SessionStore, SESSION_TTL_MS, SESSION_TOUCH_INTERVAL_MS, MAX_SESSIONS_PER_USER } from "./sessions.js";
+import { createSessionStore, type SessionStore, SESSION_TTL_MS, SESSION_TOUCH_INTERVAL_MS, MAX_SESSIONS_PER_USER, GUEST_SESSION_TTL_MS } from "./sessions.js";
 
 function sha256(token: string) {
   return createHash("sha256").update(token).digest("hex");
@@ -126,3 +126,74 @@ describe("SessionStore", () => {
     expect(count).toBe(MAX_SESSIONS_PER_USER);
   });
 });
+
+describe("guest sessions", () => {
+  let botDb: BotDatabase;
+  let sessions: SessionStore;
+
+  beforeEach(() => {
+    botDb = createDatabase(":memory:");
+    sessions = createSessionStore(botDb.db);
+    // Create the synthetic guest user row to satisfy the sessions FK.
+    botDb.db
+      .prepare("INSERT OR IGNORE INTO users (id, username, passwordHash, createdAt, updatedAt, role) VALUES ('__guest__','游客','!',?,?, 'guest')")
+      .run(Date.now(), Date.now());
+  });
+
+  afterEach(() => {
+    vi.useRealTimers();
+    botDb.close();
+  });
+
+  it("skipCap lets more than MAX_SESSIONS_PER_USER coexist for one principal", () => {
+    const tokens: string[] = [];
+    for (let i = 0; i < MAX_SESSIONS_PER_USER + 3; i++) {
+      tokens.push(sessions.createSession("__guest__", { ttlMs: GUEST_SESSION_TTL_MS, skipCap: true }).token);
+    }
+    // The first token must STILL validate (not evicted).
+    expect(sessions.validateAndTouch(tokens[0])?.role).toBe("guest");
+    const n = (botDb.db.prepare("SELECT COUNT(*) AS n FROM sessions WHERE userId='__guest__'").get() as { n: number }).n;
+    expect(n).toBe(MAX_SESSIONS_PER_USER + 3);
+  });
+
+  it("ttlMs sets a shorter expiry than the default", () => {
+    const { expiresAt } = sessions.createSession("__guest__", { ttlMs: GUEST_SESSION_TTL_MS, skipCap: true });
+    expect(expiresAt).toBeLessThanOrEqual(Date.now() + GUEST_SESSION_TTL_MS + 50);
+  });
+
+  it("validateAndTouch refreshes a guest session to GUEST_SESSION_TTL_MS (1d), not SESSION_TTL_MS (7d)", () => {
+    const { token } = sessions.createSession("__guest__", { ttlMs: GUEST_SESSION_TTL_MS, skipCap: true });
+    // Force the touch branch: backdate lastSeenAt past the touch interval.
+    botDb.db
+      .prepare("UPDATE sessions SET lastSeenAt = ? WHERE userId = '__guest__'")
+      .run(Date.now() - (SESSION_TOUCH_INTERVAL_MS + 1000));
+    const result = sessions.validateAndTouch(token);
+    expect(result?.role).toBe("guest");
+    const row = botDb.db
+      .prepare("SELECT expiresAt FROM sessions WHERE userId = '__guest__'")
+      .get() as { expiresAt: number };
+    // Should refresh to ~now + 1 day, NOT now + 7 days.
+    expect(row.expiresAt).toBeGreaterThan(Date.now() + GUEST_SESSION_TTL_MS - 5000);
+    expect(row.expiresAt).toBeLessThanOrEqual(Date.now() + GUEST_SESSION_TTL_MS + 5000);
+    // Sanity: well below the 7d window.
+    expect(row.expiresAt).toBeLessThan(Date.now() + SESSION_TTL_MS);
+  });
+
+  it("validateAndTouch still refreshes a non-guest (admin) session to SESSION_TTL_MS (7d) on touch", () => {
+    botDb.db
+      .prepare("INSERT INTO users (id, username, passwordHash, createdAt, updatedAt, role) VALUES ('admin1','adminuser','!',?,?, 'admin')")
+      .run(Date.now(), Date.now());
+    const { token } = sessions.createSession("admin1");
+    botDb.db
+      .prepare("UPDATE sessions SET lastSeenAt = ? WHERE userId = 'admin1'")
+      .run(Date.now() - (SESSION_TOUCH_INTERVAL_MS + 1000));
+    const result = sessions.validateAndTouch(token);
+    expect(result?.role).toBe("admin");
+    const row = botDb.db
+      .prepare("SELECT expiresAt FROM sessions WHERE userId = 'admin1'")
+      .get() as { expiresAt: number };
+    // Refreshes to ~now + 7 days, NOT the 1d guest window.
+    expect(row.expiresAt).toBeGreaterThan(Date.now() + SESSION_TTL_MS - 5000);
+    expect(row.expiresAt).toBeLessThanOrEqual(Date.now() + SESSION_TTL_MS + 5000);
+  });
+});

src/data/sessions.ts

@@ -2,17 +2,18 @@ import { createHash, randomBytes } from "node:crypto";
 import type Database from "better-sqlite3";
 
 export const SESSION_TTL_MS = 7 * 24 * 60 * 60 * 1000; // 7 days
+export const GUEST_SESSION_TTL_MS = 24 * 60 * 60 * 1000; // 1 day — guests are short-lived
 export const SESSION_TOUCH_INTERVAL_MS = 60 * 60 * 1000; // 1 hour
 export const MAX_SESSIONS_PER_USER = 10;
 
 export interface SessionValidation {
   userId: string;
   username: string;
-  role: "admin" | "member";
+  role: "admin" | "member" | "guest";
 }
 
 export interface SessionStore {
-  createSession(userId: string): { token: string; expiresAt: number };
+  createSession(userId: string, opts?: { ttlMs?: number; skipCap?: boolean }): { token: string; expiresAt: number };
   validateAndTouch(rawToken: string): SessionValidation | null;
   deleteSession(rawToken: string): void;
   deleteAllForUser(userId: string, exceptToken?: string): void;
@@ -47,7 +48,7 @@ export function createSessionStore(db: Database.Database): SessionStore {
   );
 
   return {
-    createSession(userId) {
+    createSession(userId, opts) {
       // Cap concurrent sessions per user — oldest gets evicted on overflow.
       // Wrap the count → delete → insert in a transaction so concurrent logins
       // for the same user can't both pass the cap check and both insert,
@@ -55,11 +56,13 @@ export function createSessionStore(db: Database.Database): SessionStore {
       const token = randomBytes(32).toString("base64url");
       const id = hashToken(token);
       const now = Date.now();
-      const expiresAt = now + SESSION_TTL_MS;
+      const expiresAt = now + (opts?.ttlMs ?? SESSION_TTL_MS);
       const tx = db.transaction(() => {
-        const existing = (countForUserStmt.get(userId) as { n: number }).n;
-        if (existing >= MAX_SESSIONS_PER_USER) {
-          deleteOldestForUserStmt.run(userId, existing - MAX_SESSIONS_PER_USER + 1);
+        if (!opts?.skipCap) {
+          const existing = (countForUserStmt.get(userId) as { n: number }).n;
+          if (existing >= MAX_SESSIONS_PER_USER) {
+            deleteOldestForUserStmt.run(userId, existing - MAX_SESSIONS_PER_USER + 1);
+          }
         }
         insertStmt.run(id, userId, now, expiresAt, now);
       });
@@ -80,9 +83,12 @@ export function createSessionStore(db: Database.Database): SessionStore {
         return null;
       }
       if (now - row.lastSeenAt > SESSION_TOUCH_INTERVAL_MS) {
-        touchStmt.run(now, now + SESSION_TTL_MS, id);
+        // Refresh against the role's own TTL — guests are short-lived (1d) and
+        // must NOT be bumped to the member/admin 7d window on touch.
+        const ttl = row.role === "guest" ? GUEST_SESSION_TTL_MS : SESSION_TTL_MS;
+        touchStmt.run(now, now + ttl, id);
       }
-      return { userId: row.userId, username: row.username, role: row.role as "admin" | "member" };
+      return { userId: row.userId, username: row.username, role: row.role as "admin" | "member" | "guest" };
     },
 
     deleteSession(rawToken) {

src/data/users.test.ts

@@ -1,6 +1,6 @@
 import { describe, it, expect, beforeEach, afterEach } from "vitest";
 import { createDatabase, type BotDatabase } from "./database.js";
-import { createUserStore, UsernameTakenError, type UserStore } from "./users.js";
+import { createUserStore, UsernameTakenError, GUEST_USER_ID, GUEST_USERNAME, type UserStore } from "./users.js";
 
 describe("UserStore", () => {
   let botDb: BotDatabase;
@@ -184,3 +184,43 @@ describe("UserStore", () => {
     expect(users.countAdmins()).toBe(1);
   });
 });
+
+describe("guest row exclusion", () => {
+  let botDb: BotDatabase;
+  let users: UserStore;
+
+  beforeEach(() => {
+    botDb = createDatabase(":memory:");
+    users = createUserStore(botDb.db);
+  });
+
+  afterEach(() => {
+    botDb.close();
+  });
+
+  it("countUsers and listUsers ignore the reserved guest row", async () => {
+    await users.createUser("alice", "password123", "member");
+    // Insert the reserved guest row directly (mirrors the migration).
+    botDb.db.prepare(
+      "INSERT OR IGNORE INTO users (id, username, passwordHash, createdAt, updatedAt, role) VALUES (?, ?, ?, ?, ?, 'guest')"
+    ).run(GUEST_USER_ID, GUEST_USERNAME, "!", Date.now(), Date.now());
+
+    expect(users.countUsers()).toBe(1); // alice only
+    expect(users.listUsers().some((u) => u.id === GUEST_USER_ID)).toBe(false);
+  });
+
+  it("setRoleIfNotLastAdmin refuses to re-role the reserved guest principal", () => {
+    // The guest row is seeded by createDatabase via ensureGuestUser.
+    expect(users.findById(GUEST_USER_ID)!.role).toBe("guest"); // sanity
+    expect(users.setRoleIfNotLastAdmin(GUEST_USER_ID, "admin")).toBe("not_found");
+    // The guest row's role is unchanged.
+    expect(users.findById(GUEST_USER_ID)!.role).toBe("guest");
+  });
+
+  it("deleteUserIfNotLastAdmin refuses to delete the reserved guest principal", () => {
+    expect(users.findById(GUEST_USER_ID)).not.toBeNull(); // sanity
+    expect(users.deleteUserIfNotLastAdmin(GUEST_USER_ID)).toBe("not_found");
+    // The guest row still exists.
+    expect(users.findById(GUEST_USER_ID)).not.toBeNull();
+  });
+});

src/data/users.ts

@@ -4,7 +4,13 @@ import bcrypt from "bcryptjs";
 
 const BCRYPT_ROUNDS = 12;
 
-export type UserRole = "admin" | "member";
+export type UserRole = "admin" | "member" | "guest";
+
+/** Reserved synthetic principal for login-less guest sessions. The username is
+ *  non-ASCII so it can never collide with an API-created account (which is
+ *  validated against ^[A-Za-z0-9_\-.]{3,32}$). */
+export const GUEST_USER_ID = "__guest__";
+export const GUEST_USERNAME = "游客";
 
 export interface UserRow {
   id: string;
@@ -39,7 +45,7 @@ export class UsernameTakenError extends Error {
 }
 
 export function createUserStore(db: Database.Database): UserStore {
-  const countStmt = db.prepare("SELECT COUNT(*) AS n FROM users");
+  const countStmt = db.prepare("SELECT COUNT(*) AS n FROM users WHERE role != 'guest'");
   const countAdminsStmt = db.prepare("SELECT COUNT(*) AS n FROM users WHERE role = 'admin'");
   const insertStmt = db.prepare(
     "INSERT INTO users (id, username, passwordHash, createdAt, updatedAt, role) VALUES (?, ?, ?, ?, ?, ?)"
@@ -57,7 +63,7 @@ export function createUserStore(db: Database.Database): UserStore {
     "UPDATE users SET role = ?, updatedAt = ? WHERE id = ?"
   );
   const listUsersStmt = db.prepare(
-    "SELECT id, username, createdAt, role FROM users ORDER BY createdAt ASC"
+    "SELECT id, username, createdAt, role FROM users WHERE role != 'guest' ORDER BY createdAt ASC"
   );
   const deleteUserStmt = db.prepare("DELETE FROM users WHERE id = ?");
 
@@ -131,6 +137,7 @@ export function createUserStore(db: Database.Database): UserStore {
       const tx = db.transaction(() => {
         const row = findByIdStmt.get(id) as UserRow | undefined;
         if (!row) return "not_found" as const;
+        if (row.role === "guest") return "not_found" as const; // reserved synthetic principal
         if (row.role === newRole) return "ok" as const; // no-op
         if (row.role === "admin" && newRole === "member") {
           const adminCount = (countAdminsStmt.get() as { n: number }).n;
@@ -155,6 +162,7 @@ export function createUserStore(db: Database.Database): UserStore {
       const tx = db.transaction(() => {
         const row = findByIdStmt.get(id) as UserRow | undefined;
         if (!row) return "not_found" as const;
+        if (row.role === "guest") return "not_found" as const; // reserved synthetic principal
         if (row.role === "admin") {
           const adminCount = (countAdminsStmt.get() as { n: number }).n;
           if (adminCount <= 1) return "would_orphan" as const;

src/index.ts

@@ -1,12 +1,17 @@
 import path from "node:path";
 import { fileURLToPath } from "node:url";
-import { loadConfig, saveConfig } from "./data/config.js";
+import { loadConfig, saveConfig, migrateLegacyConfig, isProviderEnabled } from "./data/config.js";
 import { createDatabase } from "./data/database.js";
 import { createLogger } from "./logger.js";
 import { createApiServerManager } from "./music/api-server.js";
 import { NeteaseProvider } from "./music/netease.js";
 import { QQMusicProvider } from "./music/qq.js";
 import { BiliBiliProvider } from "./music/bilibili.js";
+import { LocalMusicProvider } from "./music/local.js";
+import { KugouProvider } from "./music/kugou.js";
+import { JellyfinProvider } from "./music/jellyfin.js";
+import { SpotifyProvider } from "./music/spotify/provider.js";
+import { SpotifyOAuth, createFileOAuthTokenStore } from "./music/spotify/spotify-oauth.js";
 import { createCookieStore } from "./music/auth.js";
 import { createAvatarStore } from "./data/avatars.js";
 import { createPermissionStore } from "./data/permissions.js";
@@ -16,14 +21,23 @@ import { createWebServer } from "./web/server.js";
 const __dirname = path.dirname(fileURLToPath(import.meta.url));
 const ROOT_DIR = path.resolve(__dirname, "..");
 const DATA_DIR = path.join(ROOT_DIR, "data");
-const CONFIG_PATH = path.join(ROOT_DIR, "config.json");
+// config.json lives under the persisted data dir (the Docker volume) alongside the
+// DB/cookies/logs, so it survives container restarts and manual edits take effect
+// (#86). LEGACY_CONFIG_PATH is the old root-level location we migrate from once.
+const CONFIG_PATH = path.join(DATA_DIR, "config.json");
+const LEGACY_CONFIG_PATH = path.join(ROOT_DIR, "config.json");
 const DB_PATH = path.join(DATA_DIR, "tsmusicbot.db");
 const LOG_DIR = path.join(DATA_DIR, "logs");
 const COOKIE_DIR = path.join(DATA_DIR, "cookies");
 const AVATAR_DIR = path.join(DATA_DIR, "avatars");
+const LOCAL_AUDIO_DIR = path.join(DATA_DIR, "local-audio");
+const SPOTIFY_DATA_DIR = path.join(DATA_DIR, "spotify");
 const STATIC_DIR = path.join(ROOT_DIR, "web", "dist");
 
 async function main() {
+  // Migrate a pre-#86 root-level config.json into the data dir so existing
+  // installs keep their settings; no-op if already migrated or none exists.
+  migrateLegacyConfig(LEGACY_CONFIG_PATH, CONFIG_PATH);
   const config = loadConfig(CONFIG_PATH);
   saveConfig(CONFIG_PATH, config);
 
@@ -39,7 +53,14 @@ async function main() {
   const db = createDatabase(DB_PATH);
 
   const apiServer = createApiServerManager(
-    { neteasePort: config.neteaseApiPort, qqMusicPort: config.qqMusicApiPort },
+    {
+      neteasePort: config.neteaseApiPort,
+      qqMusicPort: config.qqMusicApiPort,
+      // Provider gating: a sidecar only starts (and binds 3001/3200) when its
+      // source is listed in enabledProviders — both are on in the default config.
+      neteaseEnabled: isProviderEnabled(config, "netease"),
+      qqEnabled: isProviderEnabled(config, "qq"),
+    },
     logger
   );
   await apiServer.start();
@@ -47,6 +68,16 @@ async function main() {
   const neteaseProvider = new NeteaseProvider(apiServer.getNeteaseBaseUrl());
   const qqProvider = new QQMusicProvider(apiServer.getQQMusicBaseUrl());
   const bilibiliProvider = new BiliBiliProvider();
+  const localProvider = new LocalMusicProvider(LOCAL_AUDIO_DIR);
+  const kugouProvider = new KugouProvider();
+  const spotifyProvider = new SpotifyProvider();
+  // Safety gate (spec §7): the source is inert unless EXPLICITLY enabled.
+  // Only feed credentials when enabled — otherwise the provider has no creds,
+  // hasCreds() is false, search returns empty, and getAuthStatus() is loggedIn:false,
+  // so setting a Client ID/Secret alone (enabled:false) never activates Spotify.
+  if (config.spotify.enabled && config.spotify.clientId) {
+    spotifyProvider.setCreds(config.spotify.clientId, config.spotify.clientSecret);
+  }
 
   const cookieStore = createCookieStore(COOKIE_DIR);
   const avatarStore = createAvatarStore(AVATAR_DIR);
@@ -56,9 +87,46 @@ async function main() {
   if (qqCookie) qqProvider.setCookie(qqCookie);
   const bilibiliCookie = cookieStore.load("bilibili");
   if (bilibiliCookie) bilibiliProvider.setCookie(bilibiliCookie);
+  const kugouCookie = cookieStore.load("kugou");
+  if (kugouCookie) kugouProvider.setCookie(kugouCookie);
+
+  // Jellyfin: admin-configured connection (no QR). The persisted blob carries
+  // AccessToken + User.Id + DeviceId and lives alongside the other platform
+  // cookies; a Jellyfin server that is unreachable at boot must not block
+  // startup — the provider authenticates lazily on first use.
+  const jellyfinProvider = new JellyfinProvider(logger);
+  jellyfinProvider.configure(config.jellyfin);
+  const jellyfinAuth = cookieStore.load("jellyfin");
+  if (jellyfinAuth) jellyfinProvider.setCookie(jellyfinAuth);
+  jellyfinProvider.setPersist((serialized) => cookieStore.save("jellyfin", serialized));
+
+  // Restore the persisted per-provider audio quality (#125) onto the shared,
+  // process-wide providers so a restart keeps the user's choice. setQuality()
+  // normalizes/ignores unknown values, so a stale entry can never break playback.
+  neteaseProvider.setQuality(config.audioQuality.netease);
+  qqProvider.setQuality(config.audioQuality.qq);
+  bilibiliProvider.setQuality(config.audioQuality.bilibili);
+  kugouProvider.setQuality(config.audioQuality.kugou);
+  jellyfinProvider.setQuality(config.audioQuality.jellyfin);
 
   const permissions = createPermissionStore(db.db);
 
+  // Single process-wide Spotify authorization (one Premium account for Stage 3).
+  // Threaded into BOTH the web OAuth router and every bot's SpotifyController so
+  // a web login immediately authorizes playback (C3.1). Own-app clientId => the
+  // redirect points at this bot's web callback; empty clientId leaves OAuth
+  // disabled (isAuthorized() stays false and the Rust backend never starts).
+  const spotifyOAuthClientId = config.spotify.clientId.trim();
+  const spotifyOAuth = new SpotifyOAuth({
+    clientId: spotifyOAuthClientId || undefined,
+    redirectUri: spotifyOAuthClientId
+      ? `http://127.0.0.1:${config.webPort}/api/spotify/callback`
+      : undefined,
+    store: createFileOAuthTokenStore(
+      path.join(SPOTIFY_DATA_DIR, "oauth", "oauth-tokens.json"),
+    ),
+  });
+
   const botManager = new BotManager(
     neteaseProvider,
     qqProvider,
@@ -67,7 +135,14 @@ async function main() {
     config,
     logger,
     avatarStore,
-    permissions
+    permissions,
+    CONFIG_PATH,
+    localProvider,
+    kugouProvider,
+    spotifyProvider,
+    SPOTIFY_DATA_DIR,
+    spotifyOAuth,
+    jellyfinProvider
   );
   await botManager.loadSavedBots();
 
@@ -77,6 +152,10 @@ async function main() {
     neteaseProvider,
     qqProvider,
     bilibiliProvider,
+    localProvider,
+    kugouProvider,
+    spotifyProvider,
+    jellyfinProvider,
     database: db,
     avatarStore,
     config,
@@ -84,6 +163,7 @@ async function main() {
     logger,
     cookieStore,
     staticDir: STATIC_DIR,
+    spotifyOAuth,
   });
   await webServer.start();
 

src/music/api-server.test.ts

@@ -0,0 +1,133 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { createApiServerManager, describeQqApiStartupError } from "./api-server.js";
+import type { Logger } from "../logger.js";
+
+// Record every listen() the QQ sidecar makes so we can assert it is always
+// pinned to the configured port (regression coverage for issue #122).
+const mockState = vi.hoisted(() => ({
+  listenCalls: [] as Array<{ port: number; host: string }>,
+}));
+
+vi.mock("@sansenjian/qq-music-api", () => {
+  const app = {
+    listen(port: number, host: string, cb?: () => void) {
+      mockState.listenCalls.push({ port, host });
+      const server = {
+        address: () => ({ port, address: host, family: "IPv4" as const }),
+        on() {
+          return server;
+        },
+        close(done?: () => void) {
+          done?.();
+        },
+      };
+      // Real net/Koa fire the listening callback on a later tick, after the
+      // caller has captured the returned server handle.
+      if (cb) setImmediate(cb);
+      return server;
+    },
+  };
+  return { default: app };
+});
+
+describe("describeQqApiStartupError", () => {
+  it("flags ERR_REQUIRE_ESM by error code with version-pin guidance", () => {
+    const hint = describeQqApiStartupError({ code: "ERR_REQUIRE_ESM", message: "..." });
+    expect(hint).toMatch(/ERR_REQUIRE_ESM/);
+    expect(hint).toMatch(/~2\.4\.0/);
+    expect(hint).toMatch(/~2\.2\.10/);
+  });
+
+  it("flags ERR_REQUIRE_ESM by message when the code is absent", () => {
+    const hint = describeQqApiStartupError(
+      new Error("require() of ES Module .../@sansenjian/qq-music-api/dist/index.js not supported")
+    );
+    expect(hint).toMatch(/incompatible @sansenjian\/qq-music-api/);
+  });
+
+  it("flags a Node engine mismatch with a Node-upgrade hint", () => {
+    const hint = describeQqApiStartupError(new Error("Unsupported engine: requires Node >=20.17"));
+    expect(hint).toMatch(/Node >=20\.17/);
+    expect(hint).toMatch(/~2\.2\.10/);
+  });
+
+  it("returns null for an unrelated startup error (falls back to the generic warning)", () => {
+    expect(describeQqApiStartupError(new Error("EADDRINUSE: port in use"))).toBeNull();
+    expect(describeQqApiStartupError(undefined)).toBeNull();
+    expect(describeQqApiStartupError(null)).toBeNull();
+  });
+});
+
+// Regression coverage for issue #122: the QQ Music API sidecar must listen on
+// the same port the client base URL targets (config.qqMusicApiPort). A stale
+// build once bound 3300 while the client requested 3200, silently breaking the
+// QQ login QR / search flow with ECONNREFUSED on 127.0.0.1:3200.
+describe("createApiServerManager — QQ sidecar port binding", () => {
+  const noopLogger = {
+    info() {},
+    warn() {},
+    error() {},
+    debug() {},
+    trace() {},
+    fatal() {},
+  } as unknown as Logger;
+
+  beforeEach(() => {
+    mockState.listenCalls = [];
+  });
+
+  it("listens on the configured qqMusicPort and exposes a matching base URL", async () => {
+    const port = 39217; // uncommon port to avoid clashing with a real instance
+    const manager = createApiServerManager(
+      { neteasePort: 39218, qqMusicPort: port, neteaseEnabled: false, qqEnabled: true },
+      noopLogger
+    );
+    await manager.start();
+    manager.stop();
+
+    expect(manager.getQQMusicBaseUrl()).toBe(`http://127.0.0.1:${port}`);
+    expect(mockState.listenCalls).toEqual([{ port, host: "127.0.0.1" }]);
+  });
+
+  it("follows qqMusicPort — not an injected PORT — and restores PORT afterwards", async () => {
+    const port = 39219;
+    const previous = process.env.PORT;
+    // Simulate a hosting platform / compose file injecting a stray PORT that
+    // must NOT leak into the QQ sidecar's chosen port.
+    process.env.PORT = "39999";
+    const manager = createApiServerManager(
+      { neteasePort: 39220, qqMusicPort: port, neteaseEnabled: false, qqEnabled: true },
+      noopLogger
+    );
+    try {
+      await manager.start();
+      // The sidecar follows qqMusicPort, never the injected PORT.
+      expect(mockState.listenCalls).toEqual([{ port, host: "127.0.0.1" }]);
+      // The injected PORT is restored so nothing else in the process is affected.
+      expect(process.env.PORT).toBe("39999");
+    } finally {
+      manager.stop();
+      if (previous === undefined) delete process.env.PORT;
+      else process.env.PORT = previous;
+    }
+  });
+
+  it("leaves an absent PORT env unset after importing the sidecar", async () => {
+    const port = 39221;
+    const previous = process.env.PORT;
+    delete process.env.PORT;
+    const manager = createApiServerManager(
+      { neteasePort: 39222, qqMusicPort: port, neteaseEnabled: false, qqEnabled: true },
+      noopLogger
+    );
+    try {
+      await manager.start();
+      // Was unset before importing — must be unset again, no leaked override.
+      expect(process.env.PORT).toBeUndefined();
+    } finally {
+      manager.stop();
+      if (previous === undefined) delete process.env.PORT;
+      else process.env.PORT = previous;
+    }
+  });
+});

src/music/api-server.ts

@@ -5,6 +5,10 @@ import type { Server } from "node:http";
 export interface ApiServerOptions {
   neteasePort: number;
   qqMusicPort: number;
+  /** Provider gating (#enabledProviders): when false, the corresponding
+   *  embedded sidecar API server is never started and its port never bound. */
+  neteaseEnabled?: boolean;
+  qqEnabled?: boolean;
 }
 
 export interface ApiServerManager {
@@ -14,6 +18,32 @@ export interface ApiServerManager {
   getQQMusicBaseUrl(): string;
 }
 
+/**
+ * Classify a QQ Music API (@sansenjian/qq-music-api) startup failure into
+ * actionable operator guidance, or null when it isn't a recognised
+ * dependency/runtime mismatch. Exported for testing.
+ *
+ * Background: the package became ESM in 2.3.x. A loose `^` range could pull an
+ * ESM-only build (2.3.0/2.3.1) that throws ERR_REQUIRE_ESM, or a 2.4.x build
+ * that needs Node >=20.17 — either way the embedded server never binds, so
+ * every QQ request fails downstream with ECONNREFUSED on the API port.
+ */
+export function describeQqApiStartupError(err: unknown): string | null {
+  const e = (err ?? {}) as { code?: string; message?: string };
+  const code = String(e.code ?? "");
+  const msg = String(e.message ?? "");
+  if (code === "ERR_REQUIRE_ESM" || /ERR_REQUIRE_ESM|require\(\) of ES ?Module/i.test(msg)) {
+    return (
+      "an incompatible @sansenjian/qq-music-api build is installed (ERR_REQUIRE_ESM). " +
+      "Pin it to ~2.4.0 (needs Node >=20.17) or ~2.2.10 in package.json, then reinstall"
+    );
+  }
+  if (/Unsupported engine|EBADENGINE|requires Node|Node\.js version/i.test(msg)) {
+    return "@sansenjian/qq-music-api 2.4.x requires Node >=20.17 (or >=22.9) — upgrade Node, or pin the package to ~2.2.10";
+  }
+  return null;
+}
+
 function isPortFree(port: number): Promise<boolean> {
   return new Promise((resolve) => {
     const server = net.createServer();
@@ -39,34 +69,43 @@ export function createApiServerManager(
 
   return {
     async start(): Promise<void> {
+      // Provider gating: with the jellyfin-only default config neither legacy
+      // sidecar starts, so ports 3001/3200 are never opened.
+      if (options.neteaseEnabled === false && options.qqEnabled === false) {
+        logger.info("NetEase/QQ providers disabled — embedded music API servers not started");
+        return;
+      }
       logger.info("Starting embedded music API servers...");
 
       // Start NetEase Cloud Music API
-      try {
-        const portFree = await isPortFree(options.neteasePort);
-        if (!portFree) {
-          logger.info(
-            { port: options.neteasePort },
-            "NetEase API port already in use — reusing existing instance"
-          );
-        } else {
-          const ncmModule = await import("NeteaseCloudMusicApi") as any;
-          const serverObj = ncmModule.server ?? ncmModule.default?.server;
-          const app = await serverObj.serveNcmApi({ port: options.neteasePort });
-          neteaseServer = app;
-          logger.info(
-            { port: options.neteasePort },
-            "NetEase Cloud Music API started"
-          );
+      if (options.neteaseEnabled !== false) {
+        try {
+          const portFree = await isPortFree(options.neteasePort);
+          if (!portFree) {
+            logger.info(
+              { port: options.neteasePort },
+              "NetEase API port already in use — reusing existing instance"
+            );
+          } else {
+            const ncmModule = await import("NeteaseCloudMusicApi") as any;
+            const serverObj = ncmModule.server ?? ncmModule.default?.server;
+            const app = await serverObj.serveNcmApi({ port: options.neteasePort });
+            neteaseServer = app;
+            logger.info(
+              { port: options.neteasePort },
+              "NetEase Cloud Music API started"
+            );
+          }
+        } catch (err) {
+          logger.error({ err }, "Failed to start NetEase Cloud Music API");
         }
-      } catch (err) {
-        logger.error({ err }, "Failed to start NetEase Cloud Music API");
       }
 
       // Start QQ Music API. Older versions auto-started on import; the
       // current fork (2.2.11+) only listens when run as `require.main`,
       // so we explicitly call .listen() on the imported Koa app and keep
       // the server handle for clean shutdown.
+      if (options.qqEnabled === false) return;
       try {
         const portFree = await isPortFree(options.qqMusicPort);
         if (!portFree) {
@@ -75,7 +114,25 @@ export function createApiServerManager(
             "QQ Music API port already in use — reusing existing instance"
           );
         } else {
-          const qqModule = (await import("@sansenjian/qq-music-api")) as any;
+          // Pin the upstream server to the configured port before importing.
+          // The package derives its default port from process.env.PORT (falling
+          // back to 3200) and, in some historical versions, auto-started that
+          // server as an import side effect. Aligning PORT with qqMusicApiPort
+          // guarantees the sidecar can never bind a different port than the one
+          // the client base URL (getQQMusicBaseUrl) targets — the root cause of
+          // issue #122, where an old build listened on 3300 while the client
+          // requested 3200. Restore the previous value right after import so we
+          // never leak the override into the rest of the process (e.g. the web
+          // server or the NetEase sidecar, which also read PORT as a fallback).
+          const prevPortEnv = process.env.PORT;
+          process.env.PORT = String(options.qqMusicPort);
+          let qqModule: any;
+          try {
+            qqModule = (await import("@sansenjian/qq-music-api")) as any;
+          } finally {
+            if (prevPortEnv === undefined) delete process.env.PORT;
+            else process.env.PORT = prevPortEnv;
+          }
           // The module's export structure varies between versions:
           //   2.2.11+: default → Koa app (has .listen)
           //   2.2.10:  default → wrapper object whose .default is the Koa app
@@ -85,25 +142,51 @@ export function createApiServerManager(
             ? candidate
             : candidate.default ?? null;
           if (koaApp && typeof koaApp.listen === "function") {
-            qqMusicServer = await new Promise<Server>((resolve, reject) => {
-              const srv = koaApp.listen(options.qqMusicPort, "127.0.0.1", () =>
-                resolve(srv)
+            // A version that auto-started on import has already bound the
+            // configured port (thanks to the PORT alignment above); reuse it
+            // rather than racing a second listen that would fail EADDRINUSE.
+            const stillFree = await isPortFree(options.qqMusicPort);
+            if (!stillFree) {
+              logger.info(
+                { port: options.qqMusicPort },
+                "QQ Music API already listening on the configured port (auto-started on import) — reusing embedded instance"
               );
-              srv.on("error", reject);
-            });
-            logger.info(
-              { port: options.qqMusicPort },
-              "QQ Music API started"
-            );
+            } else {
+              qqMusicServer = await new Promise<Server>((resolve, reject) => {
+                const srv = koaApp.listen(options.qqMusicPort, "127.0.0.1", () =>
+                  resolve(srv)
+                );
+                srv.on("error", reject);
+              });
+              // Log the port actually bound (read from the socket) rather than
+              // the requested one, so operators can spot a mismatch in the logs.
+              const addr = qqMusicServer.address();
+              const boundPort =
+                addr && typeof addr === "object" && addr !== null
+                  ? addr.port
+                  : options.qqMusicPort;
+              logger.info(
+                { port: boundPort },
+                "QQ Music API started"
+              );
+            }
           } else {
             logger.warn("QQ Music API module does not expose a Koa app");
           }
         }
       } catch (err) {
-        logger.warn(
-          { err },
-          "QQ Music API not available — QQ Music features may be limited"
-        );
+        const hint = describeQqApiStartupError(err);
+        if (hint) {
+          logger.error(
+            { err },
+            `QQ Music API failed to start — ${hint}. QQ features (search/play/login) will be unavailable until fixed; port ${options.qqMusicPort} is down.`
+          );
+        } else {
+          logger.warn(
+            { err },
+            "QQ Music API not available — QQ Music features may be limited"
+          );
+        }
       }
     },
 

src/music/auth.ts

@@ -1,9 +1,13 @@
 import fs from "node:fs";
 import path from "node:path";
 
+/** Platforms with a persisted credential blob. For jellyfin the "cookie" is a
+ *  JSON string carrying the access token / userId / deviceId (see jellyfin.ts). */
+type CookiePlatform = "netease" | "qq" | "bilibili" | "kugou" | "jellyfin";
+
 export interface CookieStore {
-  save(platform: "netease" | "qq" | "bilibili", cookie: string): void;
-  load(platform: "netease" | "qq" | "bilibili"): string;
+  save(platform: CookiePlatform, cookie: string): void;
+  load(platform: CookiePlatform): string;
 }
 
 export function createCookieStore(cookieDir: string): CookieStore {
@@ -12,7 +16,7 @@ export function createCookieStore(cookieDir: string): CookieStore {
   }
 
   return {
-    save(platform: "netease" | "qq" | "bilibili", cookie: string): void {
+    save(platform: CookiePlatform, cookie: string): void {
       const filePath = path.join(cookieDir, `${platform}.json`);
       fs.writeFileSync(
         filePath,
@@ -21,7 +25,7 @@ export function createCookieStore(cookieDir: string): CookieStore {
       );
     },
 
-    load(platform: "netease" | "qq" | "bilibili"): string {
+    load(platform: CookiePlatform): string {
       const filePath = path.join(cookieDir, `${platform}.json`);
       if (!fs.existsSync(filePath)) return "";
       try {

src/music/bilibili.test.ts

@@ -0,0 +1,39 @@
+import { describe, it, expect, vi } from "vitest";
+import { BiliBiliProvider } from "./bilibili.js";
+
+describe("BiliBiliProvider.search pagination", () => {
+  function mockProvider() {
+    const p = new BiliBiliProvider();
+    const get = vi.fn().mockResolvedValue({ data: { data: { result: [] } } });
+    // Short-circuit the buvid + wbi bootstrap so search only issues the
+    // /search/type request we want to inspect.
+    (p as any).buvidInitialized = true;
+    (p as any).wbiMixinKey = "0".repeat(32);
+    (p as any).wbiKeyFetchedAt = Date.now();
+    (p as any).api = { get };
+    return { p, get };
+  }
+
+  function searchParams(get: ReturnType<typeof vi.fn>) {
+    const call = get.mock.calls.find(
+      (c: any[]) => c[0] === "/x/web-interface/wbi/search/type"
+    );
+    expect(call, "expected a /search/type call").toBeTruthy();
+    // signWbi stringifies every value.
+    return call![1].params as Record<string, string>;
+  }
+
+  it("adds page (offset/limit+1) alongside page_size", async () => {
+    const { p, get } = mockProvider();
+    await p.search("hello", 20, 20); // page 2
+    const params = searchParams(get);
+    expect(params.page).toBe("2");
+    expect(params.page_size).toBe("20");
+  });
+
+  it("defaults offset to 0 → page 1 (backward compatible)", async () => {
+    const { p, get } = mockProvider();
+    await p.search("hello", 20);
+    expect(searchParams(get).page).toBe("1");
+  });
+});

src/music/bilibili.ts

@@ -3,6 +3,7 @@ import axios, { type AxiosInstance } from "axios";
 import type {
   MusicProvider,
   Song,
+  SongUrlResult,
   Playlist,
   LyricLine,
   SearchResult,
@@ -146,12 +147,16 @@ export class BiliBiliProvider implements MusicProvider {
     return fixed;
   }
 
-  async search(query: string, limit = 20): Promise<SearchResult> {
+  async search(query: string, limit = 20, offset = 0): Promise<SearchResult> {
     await this.ensureBuvidCookie();
     await this.ensureWbiKeys();
+    // /search/type is page-based; the web pages in limit-aligned steps so
+    // offset is a multiple of page_size.
+    const page = Math.floor(offset / limit) + 1;
     const signed = this.signWbi({
       search_type: "video",
       keyword: query,
+      page,
       page_size: limit,
     });
     const res = await this.api.get("/x/web-interface/wbi/search/type", {
@@ -231,7 +236,7 @@ export class BiliBiliProvider implements MusicProvider {
     return this.cidCache.get(bvid) ?? null;
   }
 
-  async getSongUrl(songId: string, _quality?: string): Promise<string | null> {
+  async getSongUrl(songId: string, _quality?: string): Promise<SongUrlResult | null> {
     const cid = await this.getCid(songId);
     if (!cid) return null;
 
@@ -253,7 +258,8 @@ export class BiliBiliProvider implements MusicProvider {
         (b.bandwidth ?? 0) > (a.bandwidth ?? 0) ? b : a
       );
 
-      return best.baseUrl ?? best.base_url ?? null;
+      const biliUrl = best.baseUrl ?? best.base_url;
+      return biliUrl ? { url: biliUrl } : null;
     } catch {
       return null;
     }

src/music/jellyfin.test.ts

@@ -0,0 +1,386 @@
+import { describe, it, expect, vi } from "vitest";
+import {
+  ticksToSeconds,
+  TICKS_PER_SECOND,
+  buildCoverUrl,
+  buildStreamUrl,
+  buildUniversalUrl,
+  mapJellyfinSong,
+  mapJellyfinAlbum,
+  mapJellyfinPlaylist,
+  mapJellyfinLyrics,
+  describeJellyfinError,
+  JELLYFIN_QUALITY_LEVELS,
+  JellyfinProvider,
+} from "./jellyfin.js";
+import type { JellyfinConfig } from "../data/config.js";
+
+function cfg(partial: Partial<JellyfinConfig> = {}): JellyfinConfig {
+  return {
+    serverUrl: "https://jf.example.com",
+    authMode: "apikey",
+    username: "",
+    password: "",
+    apiKey: "KEY",
+    userId: "user-1",
+    ...partial,
+  };
+}
+
+/** Provider with a mocked axios instance; returns the request spy. */
+function mockProvider(config = cfg(), responder?: (req: any) => any) {
+  const p = new JellyfinProvider();
+  p.configure(config);
+  const request = vi.fn(async (req: any) => ({
+    data: responder ? responder(req) : { Items: [] },
+  }));
+  (p as any).api = { request, post: vi.fn() };
+  return { p, request };
+}
+
+describe("Jellyfin mapping helpers", () => {
+  it("converts ticks to seconds (1 tick = 100ns)", () => {
+    expect(ticksToSeconds(TICKS_PER_SECOND)).toBe(1);
+    expect(ticksToSeconds(2_275_000_000)).toBeCloseTo(227.5, 3);
+    expect(ticksToSeconds(undefined)).toBe(0);
+    expect(ticksToSeconds(NaN)).toBe(0);
+  });
+
+  it("maps a Jellyfin audio item to Song (GUID id stays a string)", () => {
+    const song = mapJellyfinSong(
+      {
+        Id: "3fa85f6457174562b3fc2c963f66afa6",
+        Name: "Track",
+        Artists: ["A", "B"],
+        AlbumArtist: "A",
+        Album: "The Album",
+        RunTimeTicks: 1_855_000_000,
+      },
+      "https://jf/x.jpg",
+    );
+    expect(song).toEqual({
+      id: "3fa85f6457174562b3fc2c963f66afa6",
+      name: "Track",
+      artist: "A / B",
+      album: "The Album",
+      duration: 186, // 185.5s rounded
+      coverUrl: "https://jf/x.jpg",
+      platform: "jellyfin",
+    });
+  });
+
+  it("falls back to AlbumArtist when Artists is empty", () => {
+    const song = mapJellyfinSong({ Id: "1", Artists: [], AlbumArtist: "Solo" }, "");
+    expect(song.artist).toBe("Solo");
+  });
+
+  it("maps albums and playlists with ChildCount", () => {
+    const album = mapJellyfinAlbum(
+      { Id: "a1", Name: "LP", AlbumArtist: "X", ChildCount: 10 },
+      "c",
+    );
+    expect(album).toMatchObject({ id: "a1", artist: "X", songCount: 10, platform: "jellyfin" });
+    const pl = mapJellyfinPlaylist({ Id: "p1", Name: "Mix", ChildCount: 7 }, "c");
+    expect(pl).toMatchObject({ id: "p1", songCount: 7, platform: "jellyfin" });
+  });
+
+  it("cover URL prefers the item's Primary image, falls back to the album's", () => {
+    const own = buildCoverUrl("https://jf", "K", {
+      Id: "i1",
+      ImageTags: { Primary: "tag1" },
+      AlbumId: "a1",
+      AlbumPrimaryImageTag: "tag2",
+    });
+    expect(own).toBe("https://jf/Items/i1/Images/Primary?maxWidth=512&tag=tag1&api_key=K");
+    const album = buildCoverUrl("https://jf", "K", {
+      Id: "i1",
+      AlbumId: "a1",
+      AlbumPrimaryImageTag: "tag2",
+    });
+    expect(album).toBe("https://jf/Items/a1/Images/Primary?maxWidth=512&tag=tag2&api_key=K");
+    expect(buildCoverUrl("https://jf", "K", { Id: "i1" })).toBe("");
+  });
+
+  it("builds direct and transcoded stream URLs", () => {
+    expect(buildStreamUrl("https://jf", "K", "i1")).toBe(
+      "https://jf/Audio/i1/stream?static=true&api_key=K",
+    );
+    const url = buildUniversalUrl("https://jf", {
+      apiKey: "K",
+      userId: "u",
+      deviceId: "d",
+      itemId: "i1",
+      kbps: 320,
+    });
+    expect(url).toContain("https://jf/Audio/i1/universal?");
+    expect(url).toContain("maxStreamingBitrate=320000");
+    expect(url).toContain("transcodingContainer=mp3");
+    expect(url).toContain("transcodingProtocol=http");
+    // The container list must be URL-encoded ("|" → %7C)
+    expect(url).toContain("container=mp3%2Caac%2Cm4a%7Caac%2Cflac%2Cwebma%2Cwebm%2Cwav%2Cogg");
+  });
+
+  it("maps lyrics with tick offsets; entries without Start collapse to 0; empty text dropped", () => {
+    const lines = mapJellyfinLyrics({
+      Lyrics: [
+        { Text: "line two", Start: 125_000_000 },
+        { Text: "line one", Start: 5_000_000 },
+        { Text: "   ", Start: 1 },
+        { Text: "untimed" },
+      ],
+    });
+    expect(lines).toEqual([
+      { time: 0, text: "untimed" },
+      { time: 0.5, text: "line one" },
+      { time: 12.5, text: "line two" },
+    ]);
+  });
+
+  it("mapJellyfinLyrics tolerates junk payloads", () => {
+    expect(mapJellyfinLyrics(null)).toEqual([]);
+    expect(mapJellyfinLyrics({})).toEqual([]);
+    expect(mapJellyfinLyrics({ Lyrics: "nope" })).toEqual([]);
+  });
+
+  it("describes common connection errors in a friendly way", () => {
+    expect(describeJellyfinError({ response: { status: 401 } })).toContain("401");
+    expect(describeJellyfinError({ code: "ECONNREFUSED" })).toContain("无法连接");
+    expect(describeJellyfinError(new Error("boom"))).toBe("boom");
+  });
+});
+
+describe("JellyfinProvider", () => {
+  it("quality: defaults to direct, ignores foreign (NetEase) values", () => {
+    const p = new JellyfinProvider();
+    expect(p.getQuality()).toBe("direct");
+    p.setQuality("exhigh"); // NetEase value from the legacy platform-less broadcast
+    expect(p.getQuality()).toBe("direct");
+    p.setQuality("320");
+    expect(p.getQuality()).toBe("320");
+    expect(JELLYFIN_QUALITY_LEVELS[0].value).toBe("direct");
+  });
+
+  it("getSongUrl: direct tier → static stream; 320 tier → universal transcode", async () => {
+    const { p } = mockProvider();
+    p.setCookie(JSON.stringify({ deviceId: "dev-1" }));
+    const direct = await p.getSongUrl("item1");
+    expect(direct?.url).toBe("https://jf.example.com/Audio/item1/stream?static=true&api_key=KEY");
+
+    p.setQuality("320");
+    const transcoded = await p.getSongUrl("item1");
+    expect(transcoded?.url).toContain("/Audio/item1/universal?");
+    expect(transcoded?.url).toContain("maxStreamingBitrate=320000");
+    expect(transcoded?.url).toContain("api_key=KEY");
+  });
+
+  it("search hits /Items for Audio, MusicAlbum and Playlist with paging", async () => {
+    const { p, request } = mockProvider();
+    await p.search("mozart", 30, 60);
+    const types = request.mock.calls.map((c) => c[0].params?.IncludeItemTypes);
+    expect(types).toContain("Audio");
+    expect(types).toContain("MusicAlbum");
+    expect(types).toContain("Playlist");
+    for (const call of request.mock.calls) {
+      expect(call[0].params.Limit).toBe(30);
+      expect(call[0].params.StartIndex).toBe(60);
+      expect(call[0].params.userId).toBe("user-1");
+      expect(call[0].headers["X-Emby-Token"]).toBe("KEY");
+    }
+  });
+
+  it("userpass: authenticates once via AuthenticateByName, persists token, retries once on 401", async () => {
+    const p = new JellyfinProvider();
+    p.configure(cfg({ authMode: "userpass", username: "eric", password: "pw", apiKey: "", userId: "" }));
+    const persisted: string[] = [];
+    p.setPersist((s) => persisted.push(s));
+
+    let tokenCounter = 0;
+    const post = vi.fn(async (..._args: any[]) => ({
+      data: { AccessToken: `tok-${++tokenCounter}`, User: { Id: "u9" } },
+    }));
+    // First data request 401s (expired token), the retry succeeds.
+    let dataCalls = 0;
+    const request = vi.fn(async (req: any) => {
+      dataCalls++;
+      if (dataCalls === 1) {
+        const err: any = new Error("Unauthorized");
+        err.response = { status: 401 };
+        throw err;
+      }
+      return { data: { Items: [{ Id: "s1", Name: "N" }] }, config: req };
+    });
+    (p as any).api = { request, post };
+
+    const songs = await p.getPlaylistSongs("pl1");
+    expect(songs).toHaveLength(1);
+    // login ran twice: initial auth + re-auth after the 401
+    expect(post).toHaveBeenCalledTimes(2);
+    const authHeader = post.mock.calls[0][2].headers.Authorization as string;
+    expect(authHeader).toContain('MediaBrowser Client="TSMusicBot"');
+    expect(authHeader).toContain("DeviceId=");
+    expect(post.mock.calls[0][1]).toEqual({ Username: "eric", Pw: "pw" });
+    // token + userId + deviceId persisted like cookies
+    const last = JSON.parse(persisted[persisted.length - 1]);
+    expect(last.accessToken).toBe("tok-2");
+    expect(last.userId).toBe("u9");
+    expect(last.deviceId).toBeTruthy();
+  });
+
+  it("userpass: surfaces the error when the retry also 401s (single retry only)", async () => {
+    const p = new JellyfinProvider();
+    p.configure(cfg({ authMode: "userpass", username: "eric", password: "bad", apiKey: "" }));
+    const post = vi.fn(async () => ({ data: { AccessToken: "t", User: { Id: "u" } } }));
+    const err: any = new Error("Unauthorized");
+    err.response = { status: 401 };
+    const request = vi.fn(async () => {
+      throw err;
+    });
+    (p as any).api = { request, post };
+    await expect(p.getPlaylistSongs("pl1")).rejects.toThrow("Unauthorized");
+    expect(request).toHaveBeenCalledTimes(2); // original + exactly one retry
+  });
+
+  it("setCookie/getCookie round-trip restores token, userId and deviceId", () => {
+    const p = new JellyfinProvider();
+    p.setCookie(JSON.stringify({ accessToken: "T", userId: "U", deviceId: "D" }));
+    expect(JSON.parse(p.getCookie())).toEqual({ accessToken: "T", userId: "U", deviceId: "D" });
+    p.setCookie("not json"); // junk must not corrupt state
+    expect(JSON.parse(p.getCookie())).toEqual({ accessToken: "T", userId: "U", deviceId: "D" });
+  });
+
+  it("getLyrics: 404 means no lyrics (empty), other errors surface", async () => {
+    const notFound: any = new Error("nf");
+    notFound.response = { status: 404 };
+    const { p } = mockProvider(cfg(), () => {
+      throw notFound;
+    });
+    expect(await p.getLyrics("i1")).toEqual([]);
+
+    const boom: any = new Error("server down");
+    boom.response = { status: 500 };
+    const { p: p2 } = mockProvider(cfg(), () => {
+      throw boom;
+    });
+    await expect(p2.getLyrics("i1")).rejects.toThrow("server down");
+  });
+
+  it("getAuthStatus reflects /System/Info reachability; unconfigured = logged out", async () => {
+    const blank = new JellyfinProvider();
+    expect(await blank.getAuthStatus()).toEqual({ loggedIn: false });
+
+    const { p } = mockProvider(cfg(), () => ({ ServerName: "NAS" }));
+    expect(await p.getAuthStatus()).toEqual({ loggedIn: true, nickname: "API Key@NAS" });
+
+    const { p: down } = mockProvider(cfg(), () => {
+      throw new Error("ECONNREFUSED");
+    });
+    expect(await down.getAuthStatus()).toEqual({ loggedIn: false });
+  });
+
+  it("getPersonalFm seeds InstantMix from a random favorite", async () => {
+    const { p, request } = mockProvider(cfg(), (req: any) => {
+      if (req.url.includes("/InstantMix")) {
+        return { Items: [{ Id: "m1", Name: "Mixed" }] };
+      }
+      if (req.params?.Filters === "IsFavorite") {
+        return { Items: [{ Id: "fav1", Name: "Fav" }] };
+      }
+      return { Items: [] };
+    });
+    const songs = await p.getPersonalFm();
+    expect(songs.map((s) => s.id)).toEqual(["m1"]);
+    const mixCall = request.mock.calls.find((c) => c[0].url.includes("/InstantMix"));
+    expect(mixCall![0].url).toContain("/Items/fav1/InstantMix");
+  });
+
+  it("getPersonalFm falls back: favorites → recently played → random", async () => {
+    const { p, request } = mockProvider(cfg(), (req: any) => {
+      if (req.url.includes("/InstantMix")) return { Items: [{ Id: "m2" }] };
+      if (req.params?.Filters === "IsFavorite") return { Items: [] };
+      if (req.params?.Filters === "IsPlayed") return { Items: [{ Id: "recent1" }] };
+      return { Items: [] };
+    });
+    const songs = await p.getPersonalFm();
+    expect(songs.map((s) => s.id)).toEqual(["m2"]);
+    const mixCall = request.mock.calls.find((c) => c[0].url.includes("/InstantMix"));
+    expect(mixCall![0].url).toContain("/Items/recent1/InstantMix");
+  });
+
+  it("playback reporter posts start/progress/stopped with PositionTicks", async () => {
+    const bodies: { url: string; data: any }[] = [];
+    const { p } = mockProvider(cfg(), () => ({}));
+    ((p as any).api.request as ReturnType<typeof vi.fn>).mockImplementation(
+      async (req: any) => {
+        bodies.push({ url: req.url, data: req.data });
+        return { data: {} };
+      },
+    );
+
+    const reporter = p.createPlaybackReporter();
+    reporter.onTrackStart("song1");
+    reporter.onTick("song1", 90.5, false);
+    reporter.onStop();
+    await vi.waitFor(() => expect(bodies).toHaveLength(3));
+
+    expect(bodies[0].url).toContain("/Sessions/Playing");
+    expect(bodies[0].data.ItemId).toBe("song1");
+    const sessionId = bodies[0].data.PlaySessionId;
+    expect(sessionId).toBeTruthy();
+
+    expect(bodies[1].url).toContain("/Sessions/Playing/Progress");
+    expect(bodies[1].data.PositionTicks).toBe(905_000_000);
+    expect(bodies[1].data.PlaySessionId).toBe(sessionId);
+
+    // Stop carries the LAST reported position so a natural track end counts as played.
+    expect(bodies[2].url).toContain("/Sessions/Playing/Stopped");
+    expect(bodies[2].data.PositionTicks).toBe(905_000_000);
+  });
+
+  it("reporter: a new track start closes the previous session; failures are swallowed", async () => {
+    const bodies: { url: string; data: any }[] = [];
+    const { p } = mockProvider(cfg(), () => ({}));
+    ((p as any).api.request as ReturnType<typeof vi.fn>).mockImplementation(
+      async (req: any) => {
+        bodies.push({ url: req.url, data: req.data });
+        if (req.url.includes("/Sessions")) throw new Error("reporting endpoint down");
+        return { data: {} };
+      },
+    );
+
+    const reporter = p.createPlaybackReporter();
+    reporter.onTrackStart("a");
+    reporter.onTick("a", 200, false);
+    reporter.onTrackStart("b"); // must post Stopped for "a" at pos 200, then Playing for "b"
+    reporter.onStop();
+    await vi.waitFor(() => expect(bodies.length).toBeGreaterThanOrEqual(5));
+
+    const stopped = bodies.filter((b) => b.url.includes("/Stopped"));
+    expect(stopped[0].data.ItemId).toBe("a");
+    expect(stopped[0].data.PositionTicks).toBe(2_000_000_000);
+    expect(stopped[1].data.ItemId).toBe("b");
+    // ticks for stale items are ignored
+    reporter.onTick("a", 999, false);
+    expect(bodies.filter((b) => b.url.includes("/Progress"))).toHaveLength(1);
+  });
+
+  it("testConnection reports server info on success and friendly errors on failure", async () => {
+    const { p } = mockProvider(cfg(), () => ({ ServerName: "NAS", Version: "10.9.11" }));
+    expect(await p.testConnection()).toEqual({ ok: true, serverName: "NAS", version: "10.9.11" });
+
+    const bad = new JellyfinProvider();
+    bad.configure(cfg({ apiKey: "", userId: "" }));
+    const res = await bad.testConnection();
+    expect(res.ok).toBe(false);
+    expect(res.error).toContain("apiKey");
+  });
+
+  it("configure drops the cached token when credentials change, keeps deviceId", () => {
+    const p = new JellyfinProvider();
+    p.configure(cfg());
+    p.setCookie(JSON.stringify({ accessToken: "T", userId: "U", deviceId: "D" }));
+    p.configure(cfg({ serverUrl: "https://other.example.com" }));
+    const state = JSON.parse(p.getCookie());
+    expect(state.accessToken).toBe("");
+    expect(state.deviceId).toBe("D");
+  });
+});

src/music/jellyfin.ts

@@ -0,0 +1,741 @@
+import { readFileSync } from "node:fs";
+import { dirname, join } from "node:path";
+import { fileURLToPath } from "node:url";
+import crypto from "node:crypto";
+import axios, { type AxiosError, type AxiosInstance } from "axios";
+import type { JellyfinConfig } from "../data/config.js";
+import type { Logger } from "../logger.js";
+import type {
+  MusicProvider,
+  Song,
+  SongUrlResult,
+  Playlist,
+  PlaylistDetail,
+  LyricLine,
+  SearchResult,
+  QrCodeResult,
+  AuthStatus,
+  Album,
+} from "./provider.js";
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+
+/** 1 tick = 100 ns → 10,000,000 ticks = 1 second (Jellyfin RunTimeTicks / lyric Start). */
+export const TICKS_PER_SECOND = 10_000_000;
+
+export function ticksToSeconds(ticks: number | null | undefined): number {
+  if (typeof ticks !== "number" || !Number.isFinite(ticks)) return 0;
+  return ticks / TICKS_PER_SECOND;
+}
+
+const CLIENT_NAME = "TSMusicBot";
+
+/** Best-effort package version for the MediaBrowser auth header. */
+const PKG_VERSION = (() => {
+  try {
+    const pkg = JSON.parse(
+      readFileSync(join(__dirname, "..", "..", "package.json"), "utf-8"),
+    ) as { version?: string };
+    return pkg.version ?? "0.0.0";
+  } catch {
+    return "0.0.0";
+  }
+})();
+
+// Jellyfin quality tiers replace the NetEase labels for this source. "direct"
+// (default) streams the original file — the bot re-encodes to Opus anyway, so
+// this is max quality. The transcode tiers exist for remote/low-bandwidth
+// Jellyfin servers.
+export const JELLYFIN_QUALITY_LEVELS = [
+  { value: "direct", label: "原始直传 Direct", bitrate: 0 },
+  { value: "320", label: "320kbps 转码", bitrate: 320 },
+  { value: "192", label: "192kbps 转码", bitrate: 192 },
+  { value: "128", label: "128kbps 转码", bitrate: 128 },
+] as const;
+
+/** Subset of Jellyfin's BaseItemDto that this provider consumes. */
+export interface JellyfinItem {
+  Id: string;
+  Name?: string;
+  Artists?: string[];
+  AlbumArtist?: string;
+  Album?: string;
+  AlbumId?: string;
+  AlbumPrimaryImageTag?: string;
+  RunTimeTicks?: number;
+  ImageTags?: { Primary?: string };
+  ChildCount?: number;
+  SongCount?: number;
+  Overview?: string;
+}
+
+/**
+ * Primary cover art URL for an item; falls back to the parent album's primary
+ * image (AlbumPrimaryImageTag) and finally to "" (the UI renders a placeholder
+ * for missing art). The api_key query param authenticates browser <img> loads
+ * and the TS-avatar download alike.
+ */
+export function buildCoverUrl(baseUrl: string, apiKey: string, item: JellyfinItem): string {
+  if (!baseUrl) return "";
+  const key = apiKey ? `&api_key=${encodeURIComponent(apiKey)}` : "";
+  if (item.ImageTags?.Primary) {
+    return `${baseUrl}/Items/${item.Id}/Images/Primary?maxWidth=512&tag=${item.ImageTags.Primary}${key}`;
+  }
+  if (item.AlbumId && item.AlbumPrimaryImageTag) {
+    return `${baseUrl}/Items/${item.AlbumId}/Images/Primary?maxWidth=512&tag=${item.AlbumPrimaryImageTag}${key}`;
+  }
+  return "";
+}
+
+/** Direct (untranscoded) stream URL — the default playback path. */
+export function buildStreamUrl(baseUrl: string, apiKey: string, itemId: string): string {
+  const params = new URLSearchParams({ static: "true", api_key: apiKey });
+  return `${baseUrl}/Audio/${itemId}/stream?${params.toString()}`;
+}
+
+/** Server-side transcode URL for the 320/192/128 kbps tiers. */
+export function buildUniversalUrl(
+  baseUrl: string,
+  o: { apiKey: string; userId: string; deviceId: string; itemId: string; kbps: number },
+): string {
+  const params = new URLSearchParams({
+    userId: o.userId,
+    deviceId: o.deviceId,
+    api_key: o.apiKey,
+    maxStreamingBitrate: String(o.kbps * 1000),
+    container: "mp3,aac,m4a|aac,flac,webma,webm,wav,ogg",
+    transcodingContainer: "mp3",
+    transcodingProtocol: "http",
+  });
+  return `${baseUrl}/Audio/${o.itemId}/universal?${params.toString()}`;
+}
+
+export function mapJellyfinSong(item: JellyfinItem, coverUrl: string): Song {
+  return {
+    id: String(item.Id),
+    name: item.Name ?? "",
+    artist: (item.Artists?.length ? item.Artists : [item.AlbumArtist ?? ""])
+      .filter(Boolean)
+      .join(" / "),
+    album: item.Album ?? "",
+    duration: Math.round(ticksToSeconds(item.RunTimeTicks)),
+    coverUrl,
+    platform: "jellyfin",
+  };
+}
+
+export function mapJellyfinAlbum(item: JellyfinItem, coverUrl: string): Album {
+  return {
+    id: String(item.Id),
+    name: item.Name ?? "",
+    artist: item.AlbumArtist ?? (item.Artists ?? []).join(" / "),
+    coverUrl,
+    songCount: item.ChildCount ?? item.SongCount ?? 0,
+    platform: "jellyfin",
+  };
+}
+
+export function mapJellyfinPlaylist(item: JellyfinItem, coverUrl: string): Playlist {
+  return {
+    id: String(item.Id),
+    name: item.Name ?? "",
+    coverUrl,
+    songCount: item.ChildCount ?? item.SongCount ?? 0,
+    platform: "jellyfin",
+  };
+}
+
+/**
+ * Map `GET /Audio/{id}/Lyrics` → the bot's synced-lyric format. `Start` is in
+ * ticks; entries without Start (plain-text lyrics) collapse to time 0 so the
+ * lyric view still renders them, just without sync. Translation stays empty —
+ * Jellyfin has no translated-lyrics concept.
+ */
+export function mapJellyfinLyrics(payload: unknown): LyricLine[] {
+  const lyrics = (payload as { Lyrics?: { Text?: string; Start?: number }[] })?.Lyrics;
+  if (!Array.isArray(lyrics)) return [];
+  return lyrics
+    .filter((l) => typeof l?.Text === "string" && l.Text.trim() !== "")
+    .map((l) => ({ time: ticksToSeconds(l.Start), text: l.Text!.trim() }))
+    .sort((a, b) => a.time - b.time);
+}
+
+/** Operator-friendly connection/auth error description (test-connection UI + logs). */
+export function describeJellyfinError(err: unknown): string {
+  const e = err as AxiosError;
+  if (e?.response) {
+    const s = e.response.status;
+    if (s === 401) return "认证失败：用户名/密码或 API Key 不正确 (401 Unauthorized)";
+    if (s === 403) return "该账号没有访问权限 (403 Forbidden)";
+    if (s === 404) return "接口不存在——请确认地址指向 Jellyfin 根路径 (404 Not Found)";
+    return `Jellyfin 返回 HTTP ${s}`;
+  }
+  const code = (e as { code?: string })?.code;
+  if (code === "ECONNREFUSED") return "无法连接 Jellyfin 服务器 (connection refused)";
+  if (code === "ENOTFOUND" || code === "EAI_AGAIN") return "无法解析服务器地址 (DNS lookup failed)";
+  if (code === "ETIMEDOUT" || code === "ECONNABORTED") return "连接 Jellyfin 超时 (timeout)";
+  return (err as Error)?.message ?? String(err);
+}
+
+/**
+ * Per-bot playback reporting handle. One playback session (PlaySessionId) per
+ * track start; the previous session is closed with its last known position so
+ * Jellyfin's played/PlayCount bookkeeping sees natural track ends as ~complete
+ * plays and mid-track skips as partial ones. Every call is fire-and-forget —
+ * reporting must never affect playback.
+ */
+export interface JellyfinPlaybackReporter {
+  onTrackStart(itemId: string): void;
+  onTick(itemId: string, positionSec: number, paused: boolean): void;
+  onStop(): void;
+}
+
+interface PersistedAuth {
+  accessToken?: string;
+  userId?: string;
+  deviceId?: string;
+}
+
+function emptyConfig(): JellyfinConfig {
+  return { serverUrl: "", authMode: "userpass", username: "", password: "", apiKey: "", userId: "" };
+}
+
+export class JellyfinProvider implements MusicProvider {
+  readonly platform = "jellyfin" as const;
+  private api: AxiosInstance;
+  private cfg: JellyfinConfig = emptyConfig();
+  private token = "";
+  private userId = "";
+  private deviceId = "";
+  private quality: string = "direct";
+  private loginPromise: Promise<void> | null = null;
+  private persistFn: ((serialized: string) => void) | null = null;
+  private logger: Logger | null = null;
+
+  constructor(logger?: Logger) {
+    this.api = axios.create({ timeout: 10000 });
+    this.logger = logger ?? null;
+  }
+
+  /**
+   * Apply (or re-apply, on settings save) the admin-configured connection.
+   * Changing any credential-relevant field drops the cached token so the next
+   * request re-authenticates; the stable deviceId survives reconfiguration.
+   */
+  configure(cfg: JellyfinConfig): void {
+    const prev = this.cfg;
+    this.cfg = { ...cfg, serverUrl: (cfg.serverUrl ?? "").trim().replace(/\/+$/, "") };
+    const credsChanged =
+      prev.serverUrl !== this.cfg.serverUrl ||
+      prev.authMode !== this.cfg.authMode ||
+      prev.username !== this.cfg.username ||
+      prev.password !== this.cfg.password ||
+      prev.apiKey !== this.cfg.apiKey ||
+      prev.userId !== this.cfg.userId;
+    if (credsChanged) {
+      this.token = "";
+      this.userId = "";
+    }
+  }
+
+  isConfigured(): boolean {
+    return this.cfg.serverUrl.length > 0;
+  }
+
+  /** Wire the on-disk persistence used after a successful login (cookie store). */
+  setPersist(fn: (serialized: string) => void): void {
+    this.persistFn = fn;
+  }
+
+  setQuality(quality: string): void {
+    // Ignore foreign values: the legacy platform-less POST /api/music/quality
+    // broadcasts NetEase levels to every provider, which must not clobber the
+    // jellyfin default ("direct").
+    if (JELLYFIN_QUALITY_LEVELS.some((l) => l.value === quality)) {
+      this.quality = quality;
+    }
+  }
+
+  getQuality(): string {
+    return this.quality;
+  }
+
+  // --- Auth ---
+
+  private authHeader(): string {
+    return (
+      `MediaBrowser Client="${CLIENT_NAME}", Device="${CLIENT_NAME}", ` +
+      `DeviceId="${this.deviceId}", Version="${PKG_VERSION}"`
+    );
+  }
+
+  private ensureDeviceId(): void {
+    if (!this.deviceId) {
+      this.deviceId = crypto.randomUUID();
+      this.persistState();
+    }
+  }
+
+  private persistState(): void {
+    try {
+      this.persistFn?.(this.getCookie());
+    } catch (err) {
+      this.logger?.warn({ err }, "Failed to persist Jellyfin auth state");
+    }
+  }
+
+  private async login(): Promise<void> {
+    this.ensureDeviceId();
+    const res = await this.api.post(
+      `${this.cfg.serverUrl}/Users/AuthenticateByName`,
+      { Username: this.cfg.username, Pw: this.cfg.password },
+      { headers: { Authorization: this.authHeader() } },
+    );
+    const token = res.data?.AccessToken as string | undefined;
+    const userId = res.data?.User?.Id as string | undefined;
+    if (!token || !userId) {
+      throw new Error("Jellyfin 登录响应缺少 AccessToken/User.Id");
+    }
+    this.token = token;
+    this.userId = userId;
+    this.persistState();
+    this.logger?.info({ userId }, "Jellyfin authenticated");
+  }
+
+  private async ensureAuth(): Promise<void> {
+    if (!this.cfg.serverUrl) {
+      throw new Error("Jellyfin 未配置服务器地址 (server URL not configured)");
+    }
+    if (this.cfg.authMode === "apikey") {
+      if (!this.cfg.apiKey || !this.cfg.userId) {
+        throw new Error("Jellyfin API Key 模式需要 apiKey 和 userId");
+      }
+      this.token = this.cfg.apiKey;
+      this.userId = this.cfg.userId;
+      this.ensureDeviceId();
+      return;
+    }
+    if (this.token && this.userId) return;
+    if (!this.cfg.username) {
+      throw new Error("Jellyfin 未配置用户名/密码 (username not configured)");
+    }
+    if (!this.loginPromise) {
+      this.loginPromise = this.login().finally(() => {
+        this.loginPromise = null;
+      });
+    }
+    return this.loginPromise;
+  }
+
+  /** Authenticated request with a single re-auth retry on 401 (userpass mode). */
+  private async request<T = unknown>(
+    method: "get" | "post",
+    path: string,
+    opts: { params?: Record<string, unknown>; data?: unknown; retried?: boolean } = {},
+  ): Promise<T> {
+    await this.ensureAuth();
+    // Callers snapshot `userId: this.userId` while building params, which is
+    // still empty before the first login. ensureAuth() has populated it by
+    // now, so backfill the stale-empty snapshot instead of sending userId="".
+    const params = opts.params ? { ...opts.params } : undefined;
+    if (params && "userId" in params && !params.userId) params.userId = this.userId;
+    try {
+      const res = await this.api.request<T>({
+        method,
+        url: this.cfg.serverUrl + path,
+        params,
+        data: opts.data,
+        headers: { "X-Emby-Token": this.token },
+      });
+      return res.data;
+    } catch (err) {
+      const status = (err as AxiosError).response?.status;
+      if (status === 401 && this.cfg.authMode === "userpass" && !opts.retried) {
+        this.token = "";
+        this.userId = "";
+        return this.request(method, path, { ...opts, retried: true });
+      }
+      throw err;
+    }
+  }
+
+  // --- MusicProvider ---
+
+  private coverFor(item: JellyfinItem): string {
+    return buildCoverUrl(this.cfg.serverUrl, this.token, item);
+  }
+
+  private mapSongs(items: JellyfinItem[] | undefined | null): Song[] {
+    return (items ?? []).map((i) => mapJellyfinSong(i, this.coverFor(i)));
+  }
+
+  async search(query: string, limit = 20, offset = 0): Promise<SearchResult> {
+    const common = {
+      searchTerm: query,
+      Recursive: true,
+      Limit: limit,
+      StartIndex: offset,
+      userId: this.userId,
+    };
+    const [songRes, albumRes, playlistRes] = await Promise.all([
+      this.request<{ Items?: JellyfinItem[] }>("get", "/Items", {
+        params: { ...common, IncludeItemTypes: "Audio" },
+      }),
+      this.request<{ Items?: JellyfinItem[] }>("get", "/Items", {
+        params: { ...common, IncludeItemTypes: "MusicAlbum", Fields: "ChildCount" },
+      }),
+      this.request<{ Items?: JellyfinItem[] }>("get", "/Items", {
+        params: { ...common, IncludeItemTypes: "Playlist", Fields: "ChildCount" },
+      }),
+    ]);
+    return {
+      songs: this.mapSongs(songRes?.Items),
+      albums: (albumRes?.Items ?? []).map((i) => mapJellyfinAlbum(i, this.coverFor(i))),
+      playlists: (playlistRes?.Items ?? []).map((i) => mapJellyfinPlaylist(i, this.coverFor(i))),
+    };
+  }
+
+  async getSongUrl(songId: string, quality?: string): Promise<SongUrlResult | null> {
+    await this.ensureAuth();
+    const level = quality ?? this.quality;
+    const tier = JELLYFIN_QUALITY_LEVELS.find((l) => l.value === level);
+    if (!tier || tier.value === "direct") {
+      return { url: buildStreamUrl(this.cfg.serverUrl, this.token, songId) };
+    }
+    return {
+      url: buildUniversalUrl(this.cfg.serverUrl, {
+        apiKey: this.token,
+        userId: this.userId,
+        deviceId: this.deviceId,
+        itemId: songId,
+        kbps: tier.bitrate,
+      }),
+    };
+  }
+
+  async getSongDetail(songId: string): Promise<Song | null> {
+    const res = await this.request<{ Items?: JellyfinItem[] }>("get", "/Items", {
+      params: { ids: songId, userId: this.userId },
+    });
+    const item = res?.Items?.[0];
+    return item ? mapJellyfinSong(item, this.coverFor(item)) : null;
+  }
+
+  async getPlaylistSongs(playlistId: string): Promise<Song[]> {
+    const res = await this.request<{ Items?: JellyfinItem[] }>(
+      "get",
+      `/Playlists/${playlistId}/Items`,
+      { params: { userId: this.userId } },
+    );
+    return this.mapSongs(res?.Items);
+  }
+
+  async getAlbumSongs(albumId: string): Promise<Song[]> {
+    const res = await this.request<{ Items?: JellyfinItem[] }>("get", "/Items", {
+      params: {
+        parentId: albumId,
+        sortBy: "ParentIndexNumber,IndexNumber",
+        userId: this.userId,
+      },
+    });
+    return this.mapSongs(res?.Items);
+  }
+
+  async getRecommendPlaylists(): Promise<Playlist[]> {
+    return this.getUserPlaylists();
+  }
+
+  async getUserPlaylists(): Promise<Playlist[]> {
+    const res = await this.request<{ Items?: JellyfinItem[] }>("get", "/Items", {
+      params: {
+        IncludeItemTypes: "Playlist",
+        Recursive: true,
+        Fields: "ChildCount",
+        SortBy: "SortName",
+        userId: this.userId,
+      },
+    });
+    return (res?.Items ?? []).map((i) => mapJellyfinPlaylist(i, this.coverFor(i)));
+  }
+
+  async getPlaylistDetail(playlistId: string): Promise<PlaylistDetail | null> {
+    const res = await this.request<{ Items?: JellyfinItem[] }>("get", "/Items", {
+      params: { ids: playlistId, Fields: "ChildCount,Overview", userId: this.userId },
+    });
+    const item = res?.Items?.[0];
+    if (!item) return null;
+    return {
+      id: String(item.Id),
+      name: item.Name ?? "",
+      description: item.Overview ?? "",
+      coverUrl: this.coverFor(item),
+      songCount: item.ChildCount ?? 0,
+    };
+  }
+
+  async getLyrics(songId: string): Promise<LyricLine[]> {
+    try {
+      const res = await this.request<unknown>("get", `/Audio/${songId}/Lyrics`);
+      return mapJellyfinLyrics(res);
+    } catch (err) {
+      // 404 = the track simply has no lyrics — not an error.
+      if ((err as AxiosError).response?.status === 404) return [];
+      throw err;
+    }
+  }
+
+  // No QR-code login concept — connection is global and admin-configured.
+  async getQrCode(): Promise<QrCodeResult> {
+    return { qrUrl: "", key: "" };
+  }
+
+  async checkQrCodeStatus(): Promise<"waiting" | "scanned" | "confirmed" | "expired"> {
+    return "expired";
+  }
+
+  setCookie(cookie: string): void {
+    try {
+      const parsed = JSON.parse(cookie) as PersistedAuth;
+      if (parsed && typeof parsed === "object") {
+        if (typeof parsed.accessToken === "string") this.token = parsed.accessToken;
+        if (typeof parsed.userId === "string") this.userId = parsed.userId;
+        if (typeof parsed.deviceId === "string") this.deviceId = parsed.deviceId;
+      }
+    } catch {
+      // Not the JSON blob we persist — ignore rather than corrupt auth state.
+    }
+  }
+
+  getCookie(): string {
+    return JSON.stringify({
+      accessToken: this.token,
+      userId: this.userId,
+      deviceId: this.deviceId,
+    });
+  }
+
+  async getAuthStatus(): Promise<AuthStatus> {
+    if (!this.cfg.serverUrl) return { loggedIn: false };
+    try {
+      const info = await this.request<{ ServerName?: string }>("get", "/System/Info");
+      const who = this.cfg.authMode === "apikey" ? "API Key" : this.cfg.username;
+      return { loggedIn: true, nickname: `${who}@${info?.ServerName ?? "Jellyfin"}` };
+    } catch (err) {
+      this.logger?.debug({ err: describeJellyfinError(err) }, "Jellyfin auth status check failed");
+      return { loggedIn: false };
+    }
+  }
+
+  /**
+   * Authenticated round-trip to /System/Info for the Settings "test connection"
+   * button. `candidate` (when given) tests form values in a throwaway instance
+   * so a failed test never disturbs the live token state.
+   */
+  async testConnection(
+    candidate?: JellyfinConfig,
+  ): Promise<{ ok: boolean; serverName?: string; version?: string; error?: string }> {
+    const probe = candidate ? new JellyfinProvider() : this;
+    if (candidate) probe.configure(candidate);
+    try {
+      const info = await probe.request<{ ServerName?: string; Version?: string }>(
+        "get",
+        "/System/Info",
+      );
+      return { ok: true, serverName: info?.ServerName, version: info?.Version };
+    } catch (err) {
+      return { ok: false, error: describeJellyfinError(err) };
+    }
+  }
+
+  /**
+   * Personal FM = Instant Mix seeded from a random favorite, falling back to a
+   * random recently-played track, then a random library track. A final safety
+   * net returns 50 random tracks when Instant Mix itself yields nothing.
+   */
+  async getPersonalFm(): Promise<Song[]> {
+    const seed = await this.pickFmSeed();
+    if (seed) {
+      const mix = await this.request<{ Items?: JellyfinItem[] }>(
+        "get",
+        `/Items/${seed}/InstantMix`,
+        { params: { userId: this.userId, limit: 50 } },
+      );
+      const songs = this.mapSongs(mix?.Items);
+      if (songs.length > 0) return songs;
+    }
+    const random = await this.request<{ Items?: JellyfinItem[] }>("get", "/Items", {
+      params: {
+        IncludeItemTypes: "Audio",
+        Recursive: true,
+        SortBy: "Random",
+        Limit: 50,
+        userId: this.userId,
+      },
+    });
+    return this.mapSongs(random?.Items);
+  }
+
+  private async pickFmSeed(): Promise<string | null> {
+    const favorite = await this.request<{ Items?: JellyfinItem[] }>("get", "/Items", {
+      params: {
+        Filters: "IsFavorite",
+        IncludeItemTypes: "Audio",
+        Recursive: true,
+        SortBy: "Random",
+        Limit: 1,
+        userId: this.userId,
+      },
+    });
+    if (favorite?.Items?.[0]?.Id) return favorite.Items[0].Id;
+
+    const played = await this.request<{ Items?: JellyfinItem[] }>("get", "/Items", {
+      params: {
+        Filters: "IsPlayed",
+        IncludeItemTypes: "Audio",
+        Recursive: true,
+        SortBy: "DatePlayed",
+        SortOrder: "Descending",
+        Limit: 20,
+        userId: this.userId,
+      },
+    });
+    const playedItems = played?.Items ?? [];
+    if (playedItems.length > 0) {
+      return playedItems[Math.floor(Math.random() * playedItems.length)].Id;
+    }
+
+    const random = await this.request<{ Items?: JellyfinItem[] }>("get", "/Items", {
+      params: {
+        IncludeItemTypes: "Audio",
+        Recursive: true,
+        SortBy: "Random",
+        Limit: 1,
+        userId: this.userId,
+      },
+    });
+    return random?.Items?.[0]?.Id ?? null;
+  }
+
+  // --- Home sections ---
+
+  async getLatestAlbums(limit = 12): Promise<Album[]> {
+    await this.ensureAuth();
+    const items = await this.request<JellyfinItem[]>(
+      "get",
+      `/Users/${this.userId}/Items/Latest`,
+      { params: { IncludeItemTypes: "MusicAlbum", Limit: limit, Fields: "ChildCount" } },
+    );
+    return (Array.isArray(items) ? items : []).map((i) =>
+      mapJellyfinAlbum(i, this.coverFor(i)),
+    );
+  }
+
+  async getMostPlayed(limit = 12): Promise<Song[]> {
+    const res = await this.request<{ Items?: JellyfinItem[] }>("get", "/Items", {
+      params: {
+        SortBy: "PlayCount",
+        SortOrder: "Descending",
+        IncludeItemTypes: "Audio",
+        Recursive: true,
+        Filters: "IsPlayed",
+        Limit: limit,
+        userId: this.userId,
+      },
+    });
+    return this.mapSongs(res?.Items);
+  }
+
+  async getFavoriteSongs(limit = 100): Promise<Song[]> {
+    const res = await this.request<{ Items?: JellyfinItem[] }>("get", "/Items", {
+      params: {
+        Filters: "IsFavorite",
+        IncludeItemTypes: "Audio",
+        Recursive: true,
+        SortBy: "SortName",
+        Limit: limit,
+        userId: this.userId,
+      },
+    });
+    return this.mapSongs(res?.Items);
+  }
+
+  async getGenres(limit = 30): Promise<{ id: string; name: string }[]> {
+    const res = await this.request<{ Items?: JellyfinItem[] }>("get", "/MusicGenres", {
+      params: { userId: this.userId, Limit: limit, SortBy: "SortName" },
+    });
+    return (res?.Items ?? []).map((i) => ({ id: String(i.Id), name: i.Name ?? "" }));
+  }
+
+  async getGenreSongs(genreId: string, limit = 100): Promise<Song[]> {
+    const res = await this.request<{ Items?: JellyfinItem[] }>("get", "/Items", {
+      params: {
+        GenreIds: genreId,
+        IncludeItemTypes: "Audio",
+        Recursive: true,
+        SortBy: "AlbumArtist,Album,SortName",
+        Limit: limit,
+        userId: this.userId,
+      },
+    });
+    return this.mapSongs(res?.Items);
+  }
+
+  // --- Playback reporting (Sessions API) ---
+
+  private async report(path: string, body: Record<string, unknown>): Promise<void> {
+    try {
+      await this.request("post", path, { data: body });
+    } catch (err) {
+      // Reporting must never affect playback — log and swallow.
+      this.logger?.debug(
+        { err: describeJellyfinError(err), path },
+        "Jellyfin playback report failed",
+      );
+    }
+  }
+
+  createPlaybackReporter(): JellyfinPlaybackReporter {
+    // One session per track start; remember the last reported position so the
+    // implicit stop on track change carries a sane PositionTicks (a natural
+    // track end reports ~full duration → Jellyfin counts the play).
+    let current: { itemId: string; sessionId: string; lastPosSec: number } | null = null;
+    const report = this.report.bind(this);
+    return {
+      onTrackStart(itemId: string): void {
+        if (current) {
+          void report("/Sessions/Playing/Stopped", {
+            ItemId: current.itemId,
+            PlaySessionId: current.sessionId,
+            PositionTicks: Math.round(current.lastPosSec * TICKS_PER_SECOND),
+          });
+        }
+        current = { itemId, sessionId: crypto.randomUUID(), lastPosSec: 0 };
+        void report("/Sessions/Playing", {
+          ItemId: itemId,
+          PlaySessionId: current.sessionId,
+          PositionTicks: 0,
+          CanSeek: true,
+        });
+      },
+      onTick(itemId: string, positionSec: number, paused: boolean): void {
+        if (!current || current.itemId !== itemId) return;
+        current.lastPosSec = positionSec;
+        void report("/Sessions/Playing/Progress", {
+          ItemId: itemId,
+          PlaySessionId: current.sessionId,
+          PositionTicks: Math.round(positionSec * TICKS_PER_SECOND),
+          IsPaused: paused,
+        });
+      },
+      onStop(): void {
+        if (!current) return;
+        void report("/Sessions/Playing/Stopped", {
+          ItemId: current.itemId,
+          PlaySessionId: current.sessionId,
+          PositionTicks: Math.round(current.lastPosSec * TICKS_PER_SECOND),
+        });
+        current = null;
+      },
+    };
+  }
+}

src/music/kugou.test.ts

@@ -0,0 +1,224 @@
+import { describe, it, expect, vi } from "vitest";
+import { mapKugouSong, mapKugouSongs, mapKugouAlbums, mapKugouPlaylist, mapKugouPlaylists, krcToLrc, KugouProvider } from "./kugou.js";
+import { parseLyrics } from "./netease.js";
+
+describe("mapKugouSongs", () => {
+  it("maps the mobile-search song shape to a Song with platform 'kugou'", () => {
+    // Shape captured live from mobilecdn.kugou.com/api/v3/search/song.
+    const raw = {
+      hash: "B3A52A7A958BF0AED0EBFBA2E9A818B7",
+      album_audio_id: 32100650,
+      album_id: "966846",
+      songname: "晴天",
+      singername: "周杰伦",
+      duration: 269,
+    };
+    const [song] = mapKugouSongs([raw]);
+    expect(song.platform).toBe("kugou");
+    expect(song.name).toBe("晴天");
+    expect(song.artist).toBe("周杰伦");
+    expect(song.duration).toBe(269);
+    // The id must round-trip hash + album_audio_id + album_id so getSongUrl
+    // can resolve a stream from a search result.
+    expect(song.id).toBe("b3a52a7a958bf0aed0ebfba2e9a818b7|32100650|966846");
+  });
+
+  it("treats nested audio_info durations as milliseconds and flat search durations as seconds", () => {
+    // List endpoints: ms under audio_info.
+    expect(mapKugouSong({ audio_info: { hash: "abc", duration: 215000 } }).duration).toBe(215);
+    // Search endpoint: a long-form track's flat `duration` stays seconds (no /1000).
+    expect(mapKugouSong({ hash: "abc", songname: "x", duration: 10800 }).duration).toBe(10800);
+  });
+
+  it("falls back to splitting '歌手 - 歌名' from the filename", () => {
+    const song = mapKugouSong({ FileHash: "deadbeef", filename: "周杰伦 - 稻香", Duration: 200 });
+    expect(song.artist).toBe("周杰伦");
+    expect(song.name).toBe("稻香");
+  });
+
+  it("uses PascalCase fields from the gateway shape and skips entries with no hash", () => {
+    const songs = mapKugouSongs([
+      { FileHash: "aa", SongName: "n", SingerName: "s", MixSongID: 1, AlbumID: 2 },
+      { songname: "no hash" } as any,
+    ]);
+    expect(songs).toHaveLength(1);
+    expect(songs[0].id).toBe("aa|1|2");
+  });
+
+  it("returns [] for non-array input", () => {
+    expect(mapKugouSongs(undefined)).toEqual([]);
+  });
+
+  it("maps the NESTED album/playlist track shape (base + audio_info)", () => {
+    // Shape captured live from /album/songs (叶惠美).
+    const raw = {
+      base: { album_id: 966846, album_audio_id: 32100648, audio_name: "以父之名", author_name: "周杰伦" },
+      audio_info: { hash: "DBC0207490EB51153EF933EF5A7E98E4", duration: 342047 },
+    };
+    const [song] = mapKugouSongs([raw]);
+    expect(song.name).toBe("以父之名");
+    expect(song.artist).toBe("周杰伦");
+    expect(song.duration).toBe(342); // ms → s
+    expect(song.id).toBe("dbc0207490eb51153ef933ef5a7e98e4|32100648|966846");
+  });
+});
+
+describe("krcToLrc", () => {
+  it("converts KRC [startMs,durMs] line timestamps + strips word timings into parseable LRC", () => {
+    // Shape captured live from lyrics.kugou.com (周杰伦 - 晴天).
+    const krc = [
+      "[ti:晴天]",
+      "[ar:周杰伦]",
+      "[0,2250]<0,160,0>晴<160,160,0>天",
+      "[63000,1800]<0,200,0>故<200,200,0>事",
+    ].join("\n");
+    const lrc = krcToLrc(krc);
+    expect(lrc).toContain("[00:00.00]晴天");
+    expect(lrc).toContain("[01:03.00]故事");
+    expect(lrc).not.toMatch(/<\d+,\d+,\d+>/); // word timings stripped
+
+    // And the shared LRC parser must now actually produce timed lines.
+    const lines = parseLyrics(lrc);
+    expect(lines.length).toBe(2);
+    expect(lines[0]).toEqual({ time: 0, text: "晴天" });
+    expect(lines[1].time).toBe(63);
+    expect(lines[1].text).toBe("故事");
+  });
+});
+
+describe("mapKugouAlbums", () => {
+  it("maps album shape and normalises {size} covers to https", () => {
+    const [album] = mapKugouAlbums([
+      { album_id: 966846, album_name: "叶惠美", singername: "周杰伦", sizable_cover: "http://imge.kugou.com/x/{size}/abc.jpg", songcount: 11 },
+    ]);
+    expect(album.platform).toBe("kugou");
+    expect(album.id).toBe("966846");
+    expect(album.name).toBe("叶惠美");
+    expect(album.coverUrl).toBe("https://imge.kugou.com/x/240/abc.jpg");
+    expect(album.songCount).toBe(11);
+  });
+});
+
+describe("mapKugouSong — playlist (get_other_list_file) shape", () => {
+  it("splits the combined `name` and uses `mixsongid` as the audio id", () => {
+    // Shape captured live from /pubsongs/v2/get_other_list_file_nofilt (我喜欢).
+    // The combined "歌手 - 歌名" is in `name`; there is no separate songname.
+    const raw = {
+      name: "KOKIA - ありがとう… (谢谢…)",
+      hash: "E9A08A98614DD992F11A68A5E5F1C79F",
+      album_id: "1491689",
+      mixsongid: 37533796,
+      timelen: 248528, // ms
+      cover: "http://imge.kugou.com/stdmusic/{size}/20210113/x.jpg",
+    };
+    const song = mapKugouSong(raw);
+    expect(song.artist).toBe("KOKIA");
+    expect(song.name).toBe("ありがとう… (谢谢…)");
+    // hash lowercased | mixsongid | album_id — so getSongUrl can resolve it.
+    expect(song.id).toBe("e9a08a98614dd992f11a68a5e5f1c79f|37533796|1491689");
+    expect(song.duration).toBe(249); // timelen ms → s
+    expect(song.coverUrl).toBe("https://imge.kugou.com/stdmusic/240/20210113/x.jpg");
+  });
+});
+
+describe("mapKugouSong — cover art per endpoint", () => {
+  it("reads `sizable_cover` (daily/FM shape) and resolves {size}→240, http→https", () => {
+    const song = mapKugouSong({
+      hash: "abc",
+      songname: "x",
+      duration: 200,
+      sizable_cover: "http://imge.kugou.com/stdmusic/{size}/y.jpg",
+    });
+    expect(song.coverUrl).toBe("https://imge.kugou.com/stdmusic/240/y.jpg");
+  });
+
+  it("falls back to `trans_param.union_cover` (search shape, no top-level cover)", () => {
+    const song = mapKugouSong({
+      hash: "abc",
+      songname: "x",
+      duration: 200,
+      trans_param: { union_cover: "http://imge.kugou.com/stdmusic/{size}/z.jpg" },
+    });
+    expect(song.coverUrl).toBe("https://imge.kugou.com/stdmusic/240/z.jpg");
+  });
+
+  it("returns an empty coverUrl when no cover field is present", () => {
+    expect(mapKugouSong({ hash: "abc", songname: "x", duration: 200 }).coverUrl).toBe("");
+  });
+
+  it("skips an empty-string cover field (Kugou returns '') and uses the next non-empty source", () => {
+    const song = mapKugouSong({
+      hash: "abc",
+      songname: "x",
+      duration: 200,
+      sizable_cover: "", // present but empty — must NOT mask the real cover below
+      trans_param: { union_cover: "http://imge.kugou.com/stdmusic/{size}/z.jpg" },
+    });
+    expect(song.coverUrl).toBe("https://imge.kugou.com/stdmusic/240/z.jpg");
+  });
+});
+
+describe("mapKugouPlaylists", () => {
+  it("maps the user-playlist shape (/v7/get_all_list info), keying id on global_collection_id", () => {
+    // Shape captured live from /v7/get_all_list (我喜欢).
+    const [pl] = mapKugouPlaylists([
+      { name: "我喜欢", count: 7, global_collection_id: "collection_3_2526507197_2_0", listid: 2, type: 0 },
+    ]);
+    expect(pl.platform).toBe("kugou");
+    expect(pl.name).toBe("我喜欢");
+    expect(pl.songCount).toBe(7);
+    // Must be the global_collection_id — the only id getPlaylistSongs can open.
+    expect(pl.id).toBe("collection_3_2526507197_2_0");
+  });
+
+  it("maps the recommend shape (/v2/special_recommend), preferring global_collection_id over specialid", () => {
+    // Shape captured live from /v2/special_recommend special_list.
+    const pl = mapKugouPlaylist({
+      specialname: "米津玄师：蒙着眼睛也能炸翻全场",
+      specialid: 1154672,
+      global_collection_id: "collection_1_1029965246_1154672_0",
+      pic: "http://imge.kugou.com/specialimg/{size}/a.jpg",
+      percount: 0,
+    });
+    expect(pl.id).toBe("collection_1_1029965246_1154672_0");
+    expect(pl.name).toBe("米津玄师：蒙着眼睛也能炸翻全场");
+    expect(pl.coverUrl).toBe("https://imge.kugou.com/specialimg/240/a.jpg");
+  });
+
+  it("drops entries whose only id is a non-openable specialid/listid (not a global_collection_id)", () => {
+    // getPlaylistSongs can only open a global_collection_id, so a numeric
+    // specialid/listid would be a dead id — such entries must be dropped.
+    expect(mapKugouPlaylists([{ specialname: "x", specialid: 1154672, listid: 9 }])).toHaveLength(0);
+    expect(mapKugouPlaylists([{ name: "no id" }])).toHaveLength(0);
+    expect(mapKugouPlaylists(undefined)).toEqual([]);
+  });
+});
+
+describe("KugouProvider.search pagination", () => {
+  function mockProvider() {
+    const p = new KugouProvider();
+    const get = vi.fn().mockResolvedValue({ data: { data: { info: [] } } });
+    (p as any).mobileHttp = { get };
+    return { p, get };
+  }
+
+  function searchParams(get: ReturnType<typeof vi.fn>) {
+    const call = get.mock.calls[0];
+    expect(call, "expected a mobile search call").toBeTruthy();
+    return call[1].params as Record<string, unknown>;
+  }
+
+  it("sets page to offset/limit+1 and keeps pagesize=limit", async () => {
+    const { p, get } = mockProvider();
+    await p.search("hello", 20, 20); // page 2
+    const params = searchParams(get);
+    expect(params.page).toBe(2);
+    expect(params.pagesize).toBe(20);
+  });
+
+  it("defaults offset to 0 → page 1 (backward compatible)", async () => {
+    const { p, get } = mockProvider();
+    await p.search("hello", 20);
+    expect(searchParams(get).page).toBe(1);
+  });
+});

src/music/local.test.ts

@@ -0,0 +1,235 @@
+import { describe, it, expect, beforeEach, afterEach } from "vitest";
+import { mkdtempSync, rmSync, existsSync, writeFileSync } from "node:fs";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+import { LocalMusicProvider } from "./local.js";
+
+let dir: string;
+
+beforeEach(() => {
+  dir = mkdtempSync(join(tmpdir(), "local-audio-test-"));
+});
+
+afterEach(() => {
+  rmSync(dir, { recursive: true, force: true });
+});
+
+// Seed real files + an index.json so we can exercise the cleanup lifecycle
+// without invoking the ffmpeg duration probe that uploadAudio runs.
+function makeRecord(id: string, bytes = 16) {
+  const filePath = join(dir, `${id}.mp3`);
+  writeFileSync(filePath, Buffer.alloc(bytes, 1));
+  return {
+    id,
+    name: id,
+    artist: "本地上传",
+    album: "本地音乐",
+    duration: 0,
+    coverUrl: "",
+    platform: "local" as const,
+    filePath,
+    originalName: `${id}.mp3`,
+    uploadedAt: "1970-01-01T00:00:00.000Z",
+    size: bytes,
+    mimeType: "audio/mpeg",
+  };
+}
+
+function seed(records: ReturnType<typeof makeRecord>[]) {
+  writeFileSync(join(dir, "index.json"), JSON.stringify(records), "utf8");
+}
+
+describe("LocalMusicProvider cleanup lifecycle", () => {
+  it("sweep keeps referenced and never-played files, deletes only played+unreferenced", async () => {
+    const a = makeRecord("a");
+    const b = makeRecord("b");
+    const c = makeRecord("c");
+    seed([a, b, c]);
+    const p = new LocalMusicProvider(dir);
+    const refs = new Set<string>(["a"]); // "a" still sits in a queue somewhere
+    p.setInUseResolver(() => refs);
+
+    await p.getSongUrl("a"); // played, but referenced
+    await p.getSongUrl("b"); // played and unreferenced
+    // "c" was never played (e.g. uploaded but not queued)
+
+    const deleted = p.sweepUnreferenced();
+
+    expect(deleted).toEqual(["b"]);
+    expect(existsSync(a.filePath)).toBe(true); // referenced → kept
+    expect(existsSync(b.filePath)).toBe(false); // played + unreferenced → deleted
+    expect(existsSync(c.filePath)).toBe(true); // never played → kept
+  });
+
+  it("a played song still in the queue survives the sweep and stays replayable (loop / prev)", async () => {
+    const a = makeRecord("a");
+    seed([a]);
+    const p = new LocalMusicProvider(dir);
+    const refs = new Set<string>(["a"]); // loop queue still references it
+    p.setInUseResolver(() => refs);
+
+    await p.getSongUrl("a"); // first pass plays it
+    p.sweepUnreferenced(); // "playback_finished" sweep
+
+    expect(existsSync(a.filePath)).toBe(true);
+    expect((await p.getSongUrl("a"))?.url).toBe(a.filePath); // next loop pass works
+  });
+
+  it("re-playing a queued local song does not delete it (play-song order)", async () => {
+    const a = makeRecord("a");
+    seed([a]);
+    const p = new LocalMusicProvider(dir);
+    // Mirror the fixed endpoint order: the song is (re)added to the queue
+    // BEFORE the sweep runs, so it is referenced when we sweep.
+    const refs = new Set<string>(["a"]);
+    p.setInUseResolver(() => refs);
+
+    await p.getSongUrl("a"); // played once
+    p.sweepUnreferenced(); // sweep fired after the replay re-queued it
+    expect(existsSync(a.filePath)).toBe(true);
+    expect(await p.getSongUrl("a")).not.toBeNull();
+  });
+
+  it("deletes a played file once it leaves every queue", async () => {
+    const a = makeRecord("a");
+    seed([a]);
+    const p = new LocalMusicProvider(dir);
+    let refs = new Set<string>(["a"]);
+    p.setInUseResolver(() => refs);
+
+    await p.getSongUrl("a");
+    p.sweepUnreferenced();
+    expect(existsSync(a.filePath)).toBe(true); // still queued
+
+    refs = new Set<string>(); // queue cleared
+    p.sweepUnreferenced();
+    expect(existsSync(a.filePath)).toBe(false); // now removed
+    expect(await p.getSongUrl("a")).toBeNull();
+  });
+
+  it("never deletes anything when the reference resolver throws", async () => {
+    const a = makeRecord("a");
+    seed([a]);
+    const p = new LocalMusicProvider(dir);
+    p.setInUseResolver(() => {
+      throw new Error("manager unavailable");
+    });
+    await p.getSongUrl("a");
+    expect(p.sweepUnreferenced()).toEqual([]);
+    expect(existsSync(a.filePath)).toBe(true);
+  });
+});
+
+describe("LocalMusicProvider upload validation", () => {
+  it("rejects a spoofed Content-Type with a non-audio extension", async () => {
+    const p = new LocalMusicProvider(dir);
+    await expect(
+      p.uploadAudio({
+        buffer: Buffer.from("malicious"),
+        originalName: "evil.exe",
+        mimeType: "application/octet-stream",
+      }),
+    ).rejects.toThrow();
+  });
+
+  it("rejects an unknown extension even when the mime claims audio", async () => {
+    const p = new LocalMusicProvider(dir);
+    await expect(
+      p.uploadAudio({
+        buffer: Buffer.from("x"),
+        originalName: "evil.html",
+        mimeType: "audio/mpeg",
+      }),
+    ).rejects.toThrow();
+  });
+
+  it("rejects an empty file", async () => {
+    const p = new LocalMusicProvider(dir);
+    await expect(
+      p.uploadAudio({ buffer: Buffer.alloc(0), originalName: "a.mp3" }),
+    ).rejects.toThrow();
+  });
+});
+
+describe("LocalMusicProvider quota", () => {
+  it("evicts oldest unreferenced uploads beyond maxFiles", async () => {
+    const a = makeRecord("a");
+    const b = makeRecord("b");
+    seed([b, a]); // newest-first: b newer than a
+    const p = new LocalMusicProvider(dir, { maxFiles: 2 });
+    p.setInUseResolver(() => new Set<string>());
+
+    // Upload a third valid file → over the 2-file cap → evict the oldest ("a").
+    await p.uploadAudio({
+      buffer: Buffer.alloc(16, 7),
+      originalName: "c.mp3",
+      mimeType: "audio/mpeg",
+    });
+
+    expect(existsSync(a.filePath)).toBe(false); // oldest evicted
+    expect(existsSync(b.filePath)).toBe(true);
+    const result = await p.search("");
+    expect(result.songs.map((s) => s.id).sort()).not.toContain("a");
+  });
+
+  it("does not evict a referenced upload even when over the cap", async () => {
+    const a = makeRecord("a");
+    const b = makeRecord("b");
+    seed([b, a]);
+    const p = new LocalMusicProvider(dir, { maxFiles: 1 });
+    p.setInUseResolver(() => new Set<string>(["a"])); // "a" is queued
+
+    await p.uploadAudio({
+      buffer: Buffer.alloc(16, 7),
+      originalName: "c.mp3",
+      mimeType: "audio/mpeg",
+    });
+
+    expect(existsSync(a.filePath)).toBe(true); // protected: still queued
+  });
+
+  it("never evicts the just-uploaded file, even when every older file is referenced", async () => {
+    const a = makeRecord("a");
+    seed([a]);
+    const p = new LocalMusicProvider(dir, { maxFiles: 1 });
+    p.setInUseResolver(() => new Set<string>(["a"])); // the only older file is queued
+
+    const song = await p.uploadAudio({
+      buffer: Buffer.alloc(16, 7),
+      originalName: "c.mp3",
+      mimeType: "audio/mpeg",
+    });
+
+    // The returned song must actually exist and be playable — not a phantom.
+    expect(await p.getSongUrl(song.id)).not.toBeNull();
+  });
+});
+
+describe("LocalMusicProvider search pagination", () => {
+  it("slices [offset, offset+limit) instead of the first page", async () => {
+    const recs = ["a", "b", "c", "d"].map((id) => makeRecord(id));
+    seed(recs); // newest-first order preserved: a, b, c, d
+    const p = new LocalMusicProvider(dir);
+
+    const page1 = await p.search("", 2); // offset defaults to 0
+    expect(page1.songs.map((s) => s.id)).toEqual(["a", "b"]);
+
+    const page2 = await p.search("", 2, 2);
+    expect(page2.songs.map((s) => s.id)).toEqual(["c", "d"]);
+  });
+});
+
+describe("LocalMusicProvider filename handling", () => {
+  it("accepts a long filename without dropping its extension", async () => {
+    const p = new LocalMusicProvider(dir);
+    const longName = "x".repeat(300) + ".mp3";
+    // Must not throw the "unsupported format" error — the extension survives.
+    const song = await p.uploadAudio({
+      buffer: Buffer.alloc(16, 1),
+      originalName: longName,
+      mimeType: "audio/mpeg",
+    });
+    expect(song.id).toBeTruthy();
+    expect(await p.getSongUrl(song.id)).not.toBeNull();
+  });
+});

src/music/local.ts

@@ -0,0 +1,391 @@
+import { spawn } from "node:child_process";
+import { existsSync, mkdirSync, readFileSync, rmSync, writeFileSync } from "node:fs";
+import { createRequire } from "node:module";
+import path from "node:path";
+import crypto from "node:crypto";
+import type {
+  Album,
+  AuthStatus,
+  LyricLine,
+  MusicProvider,
+  Playlist,
+  PlaylistDetail,
+  QrCodeResult,
+  SearchResult,
+  Song,
+  SongUrlResult,
+} from "./provider.js";
+
+const require = createRequire(import.meta.url);
+const ffmpegPath: string | null = require("ffmpeg-static");
+
+const AUDIO_EXTENSIONS = new Set([
+  ".mp3",
+  ".flac",
+  ".wav",
+  ".m4a",
+  ".aac",
+  ".ogg",
+  ".opus",
+  ".webm",
+  ".wma",
+  ".alac",
+  ".aiff",
+  ".ape",
+]);
+
+const DEFAULT_MAX_FILES = 200;
+const DEFAULT_MAX_TOTAL_BYTES = 5 * 1024 * 1024 * 1024; // 5 GiB
+
+export interface LocalMusicProviderOptions {
+  /** Max number of uploaded files kept on disk (oldest unreferenced evicted). */
+  maxFiles?: number;
+  /** Max total bytes of uploaded files kept on disk. */
+  maxTotalBytes?: number;
+}
+
+interface LocalSongRecord extends Song {
+  filePath: string;
+  originalName: string;
+  uploadedAt: string;
+  size: number;
+  mimeType: string;
+}
+
+function safeFileName(name: string): string {
+  const base = path.basename(name || "audio")
+    .replace(/[<>:"/\\|?*\x00-\x1F]/g, "_")
+    .replace(/\s+/g, " ")
+    .trim();
+  if (!base) return "audio";
+  // Cap the total length but ALWAYS preserve the extension — truncating the
+  // whole string would drop a trailing ".mp3" on a long filename and make the
+  // file fail extension validation.
+  const ext = path.extname(base);
+  const stem = ext ? base.slice(0, base.length - ext.length) : base;
+  const safeStem = stem.slice(0, Math.max(1, 160 - ext.length)) || "audio";
+  return `${safeStem}${ext}`;
+}
+
+function titleFromFileName(name: string): string {
+  return safeFileName(name).replace(/\.[^.]+$/, "") || "本地音频";
+}
+
+async function probeDurationSeconds(filePath: string): Promise<number> {
+  return new Promise((resolve) => {
+    const ffmpeg = spawn(ffmpegPath || "ffmpeg", ["-hide_banner", "-i", filePath], {
+      stdio: ["ignore", "ignore", "pipe"],
+    });
+    let stderr = "";
+    const timeout = setTimeout(() => {
+      ffmpeg.kill("SIGKILL");
+      resolve(0);
+    }, 5000);
+    ffmpeg.stderr.on("data", (chunk) => {
+      stderr += chunk.toString("utf8");
+    });
+    ffmpeg.on("error", () => {
+      clearTimeout(timeout);
+      resolve(0);
+    });
+    ffmpeg.on("close", () => {
+      clearTimeout(timeout);
+      const match = stderr.match(/Duration:\s*(\d+):(\d+):(\d+(?:\.\d+)?)/);
+      if (!match) {
+        resolve(0);
+        return;
+      }
+      const hours = Number(match[1]);
+      const minutes = Number(match[2]);
+      const seconds = Number(match[3]);
+      const total = hours * 3600 + minutes * 60 + seconds;
+      resolve(Number.isFinite(total) ? Math.round(total) : 0);
+    });
+  });
+}
+
+export class LocalMusicProvider implements MusicProvider {
+  readonly platform = "local" as const;
+  private readonly uploadDir: string;
+  private readonly indexPath: string;
+  private records: LocalSongRecord[] = [];
+  private readonly maxFiles: number;
+  private readonly maxTotalBytes: number;
+  /** Ids that have been resolved for playback at least once; only these are
+   *  eligible for reference-aware cleanup, so freshly uploaded files that are
+   *  not yet queued/played survive in the search list. */
+  private playedIds = new Set<string>();
+  /** Returns the set of local song ids still referenced by any bot's queue.
+   *  Deletion never removes a file whose id this set contains. */
+  private inUseResolver: () => Set<string> = () => new Set<string>();
+  /** Ids with an in-flight retry-delete scheduled (file briefly locked, e.g.
+   *  ffmpeg on Windows still releasing a just-stopped track). */
+  private retrying = new Set<string>();
+
+  constructor(uploadDir: string, options: LocalMusicProviderOptions = {}) {
+    this.uploadDir = uploadDir;
+    this.indexPath = path.join(uploadDir, "index.json");
+    this.maxFiles = options.maxFiles ?? DEFAULT_MAX_FILES;
+    this.maxTotalBytes = options.maxTotalBytes ?? DEFAULT_MAX_TOTAL_BYTES;
+    mkdirSync(uploadDir, { recursive: true });
+    this.loadIndex();
+  }
+
+  /** Wire the resolver the BotManager uses to report which uploads are still
+   *  queued anywhere. Must be set before any cleanup can delete files. */
+  setInUseResolver(resolver: () => Set<string>): void {
+    this.inUseResolver = resolver;
+  }
+
+  private referencedIds(): Set<string> | null {
+    try {
+      return this.inUseResolver() ?? new Set<string>();
+    } catch {
+      // Resolver failure → references unknown → refuse to delete anything.
+      return null;
+    }
+  }
+
+  private loadIndex(): void {
+    try {
+      const raw = readFileSync(this.indexPath, "utf8");
+      const parsed = JSON.parse(raw) as LocalSongRecord[];
+      this.records = Array.isArray(parsed)
+        ? parsed.filter((r) => r && typeof r.id === "string" && typeof r.filePath === "string")
+        : [];
+    } catch {
+      this.records = [];
+    }
+  }
+
+  private saveIndex(): void {
+    writeFileSync(this.indexPath, JSON.stringify(this.records, null, 2), "utf8");
+  }
+
+  async uploadAudio(input: {
+    buffer: Buffer;
+    originalName: string;
+    mimeType?: string;
+  }): Promise<Song> {
+    const originalName = safeFileName(input.originalName || "audio");
+    const ext = path.extname(originalName).toLowerCase();
+    // Validate by the (sanitised) file extension only — never trust the
+    // client-supplied Content-Type. This also guarantees the STORED extension
+    // is one of the known audio types, so a spoofed header cannot persist an
+    // arbitrary-extension blob on disk.
+    if (!AUDIO_EXTENSIONS.has(ext)) {
+      throw new Error("只支持常见音频文件，如 mp3、flac、wav、m4a、ogg、opus、aac、webm 等");
+    }
+    if (!input.buffer || input.buffer.length === 0) {
+      throw new Error("上传文件为空");
+    }
+
+    const id = crypto.randomUUID();
+    const storedName = `${id}${ext}`;
+    const filePath = path.join(this.uploadDir, storedName);
+    writeFileSync(filePath, input.buffer);
+
+    const duration = await probeDurationSeconds(filePath);
+    const song: LocalSongRecord = {
+      id,
+      name: titleFromFileName(originalName),
+      artist: "本地上传",
+      album: "本地音乐",
+      duration,
+      coverUrl: "",
+      platform: "local",
+      filePath,
+      originalName,
+      uploadedAt: new Date().toISOString(),
+      size: input.buffer.length,
+      mimeType: input.mimeType || "application/octet-stream",
+    };
+
+    this.records.unshift(song);
+    this.saveIndex();
+    // Never evict the file we just accepted, even if every older file is still
+    // queued — returning success for a file we deleted would be a phantom entry.
+    this.enforceQuota(id);
+    return this.toSong(song);
+  }
+
+  private toSong(record: LocalSongRecord): Song {
+    const { filePath: _filePath, originalName: _originalName, uploadedAt: _uploadedAt, size: _size, mimeType: _mimeType, ...song } = record;
+    return song;
+  }
+
+  async search(query: string, limit = 20, offset = 0): Promise<SearchResult> {
+    const q = query.trim().toLowerCase();
+    const songs = this.records
+      .filter((r) => existsSync(r.filePath))
+      .filter((r) => !q || `${r.name} ${r.artist} ${r.album} ${r.originalName}`.toLowerCase().includes(q))
+      .slice(offset, offset + limit)
+      .map((r) => this.toSong(r));
+    return { songs, playlists: [], albums: [] };
+  }
+
+  async getSongUrl(songId: string): Promise<SongUrlResult | null> {
+    const record = this.records.find((r) => r.id === songId);
+    if (!record || !existsSync(record.filePath)) return null;
+    // A song that is actually resolved for playback becomes eligible for
+    // cleanup once it is no longer referenced by any queue.
+    this.playedIds.add(songId);
+    return { url: record.filePath };
+  }
+
+  async getSongDetail(songId: string): Promise<Song | null> {
+    const record = this.records.find((r) => r.id === songId);
+    return record && existsSync(record.filePath) ? this.toSong(record) : null;
+  }
+
+  /**
+   * Reference-aware cleanup: delete only files that have been played at least
+   * once AND are no longer referenced by any bot's queue. Safe to call after
+   * any queue mutation — a file still queued anywhere (loop replay, prev,
+   * the song being re-started, the same upload queued on another bot) is kept.
+   * Returns the ids that were deleted.
+   */
+  sweepUnreferenced(): string[] {
+    const inUse = this.referencedIds();
+    if (!inUse) return [];
+    const deleted: string[] = [];
+    for (let i = this.records.length - 1; i >= 0; i--) {
+      const r = this.records[i];
+      if (!this.playedIds.has(r.id) || inUse.has(r.id)) continue;
+      if (this.unlinkRecordAt(i)) {
+        deleted.push(r.id);
+      } else {
+        // File still locked (e.g. ffmpeg just-stopped on Windows) — keep the
+        // record and retry shortly; never orphan it or abort the rest.
+        this.scheduleRetry(r.id);
+      }
+    }
+    if (deleted.length) this.saveIndex();
+    return deleted;
+  }
+
+  /** Evict oldest, never-referenced uploads until under the file-count and
+   *  total-byte caps. Bounds disk use from uploads that are never played.
+   *  `protectId` is never evicted (the file just uploaded in this same call). */
+  private enforceQuota(protectId?: string): void {
+    if (this.records.length <= this.maxFiles &&
+        this.totalBytes() <= this.maxTotalBytes) {
+      return;
+    }
+    const inUse = this.referencedIds();
+    if (!inUse) return; // can't safely evict without knowing references
+    let count = this.records.length;
+    let bytes = this.totalBytes();
+    let changed = false;
+    for (let i = this.records.length - 1;
+         i >= 0 && (count > this.maxFiles || bytes > this.maxTotalBytes);
+         i--) {
+      const r = this.records[i];
+      if (inUse.has(r.id) || r.id === protectId) continue; // never evict these
+      const size = r.size || 0;
+      if (this.unlinkRecordAt(i)) {
+        count--;
+        bytes -= size;
+        changed = true;
+      }
+    }
+    if (changed) this.saveIndex();
+  }
+
+  /**
+   * Delete the backing file for records[index] and drop the record from memory.
+   * Deletes the FILE FIRST, then mutates state only on success, so a failed
+   * unlink leaves the record intact (file + index stay consistent) instead of
+   * orphaning the file. Returns true if the file is gone (deleted or already
+   * absent), false if it is still present (locked). Never throws; does NOT
+   * persist the index — callers batch saveIndex().
+   */
+  private unlinkRecordAt(index: number): boolean {
+    const r = this.records[index];
+    try {
+      rmSync(r.filePath, { force: true });
+    } catch {
+      // rmSync force:true only swallows ENOENT; EBUSY/EPERM/EACCES throw. If
+      // the file genuinely vanished anyway, fall through and drop the record.
+      if (existsSync(r.filePath)) return false;
+    }
+    this.records.splice(index, 1);
+    this.playedIds.delete(r.id);
+    this.retrying.delete(r.id);
+    return true;
+  }
+
+  /** Schedule a bounded, non-blocking retry to delete a briefly-locked file.
+   *  Uses unref'd timers so it never keeps the process alive. */
+  private scheduleRetry(id: string, attempt = 1): void {
+    if (attempt === 1 && this.retrying.has(id)) return;
+    this.retrying.add(id);
+    const MAX_ATTEMPTS = 6;
+    const timer = setTimeout(() => {
+      const index = this.records.findIndex((r) => r.id === id);
+      if (index < 0) { this.retrying.delete(id); return; } // already removed
+      const inUse = this.referencedIds();
+      if (!inUse || inUse.has(id)) { this.retrying.delete(id); return; } // unknown or re-queued
+      if (this.unlinkRecordAt(index)) {
+        this.saveIndex();
+      } else if (attempt < MAX_ATTEMPTS) {
+        this.scheduleRetry(id, attempt + 1);
+      } else {
+        this.retrying.delete(id); // give up; next sweep/quota will retry
+      }
+    }, 500 * attempt);
+    if (typeof timer.unref === "function") timer.unref();
+  }
+
+  private totalBytes(): number {
+    return this.records.reduce((n, r) => n + (r.size || 0), 0);
+  }
+
+  setQuality(_quality: string): void {
+    // 本地文件按原始音质播放。
+  }
+
+  getQuality(): string {
+    return "original";
+  }
+
+  async getPlaylistSongs(_playlistId: string): Promise<Song[]> {
+    return [];
+  }
+
+  async getRecommendPlaylists(): Promise<Playlist[]> {
+    return [];
+  }
+
+  async getAlbumSongs(_albumId: string): Promise<Song[]> {
+    return [];
+  }
+
+  async getLyrics(_songId: string): Promise<LyricLine[]> {
+    return [];
+  }
+
+  async getQrCode(): Promise<QrCodeResult> {
+    throw new Error("Local music does not require login");
+  }
+
+  async checkQrCodeStatus(_key: string): Promise<"waiting" | "scanned" | "confirmed" | "expired"> {
+    return "expired";
+  }
+
+  setCookie(_cookie: string): void {
+    // no-op
+  }
+
+  getCookie(): string {
+    return "";
+  }
+
+  async getAuthStatus(): Promise<AuthStatus> {
+    return { loggedIn: true, nickname: "本地音乐" };
+  }
+
+  async getPlaylistDetail(_playlistId: string): Promise<PlaylistDetail | null> {
+    return null;
+  }
+}

src/music/netease.test.ts

@@ -1,5 +1,5 @@
-import { describe, it, expect } from "vitest";
-import { parseLyrics, mapNeteaseAlbums } from "./netease.js";
+import { describe, it, expect, vi } from "vitest";
+import { parseLyrics, mapNeteaseAlbums, mapNeteaseSongs, parseNeteaseTrial, NeteaseProvider } from "./netease.js";
 
 describe("NetEase adapter", () => {
   it("parses LRC format lyrics", () => {
@@ -56,4 +56,86 @@ describe("NetEase adapter", () => {
     expect(mapNeteaseAlbums(null as any)).toEqual([]);
     expect(mapNeteaseAlbums(undefined as any)).toEqual([]);
   });
+
+  it("mapNeteaseSongs maps fee to vip flag (1/4 = vip, 0/8 = free)", () => {
+    const raw = [
+      { id: 1, name: "VIP", ar: [{ name: "A" }], al: { name: "Al", picUrl: "p" }, dt: 180000, fee: 1 },
+      { id: 2, name: "Album-only", ar: [], al: { name: "Al", picUrl: "" }, dt: 0, fee: 4 },
+      { id: 3, name: "Free", ar: [], al: {}, dt: 0, fee: 0 },
+      { id: 4, name: "Free low-quality", ar: [], al: {}, dt: 0, fee: 8 },
+    ];
+    const out = mapNeteaseSongs(raw);
+    expect(out[0].vip).toBe(true);
+    expect(out[1].vip).toBe(true);
+    expect(out[2].vip).toBe(false);
+    expect(out[3].vip).toBe(false); // fee=8 plays in full (low quality), NOT vip
+  });
+
+  it("mapNeteaseSongs accepts artists/album/duration aliases (personal_fm shape)", () => {
+    const out = mapNeteaseSongs([
+      { id: 9, name: "FM", artists: [{ name: "B" }], album: { name: "Al2", picUrl: "p2" }, duration: 200000, fee: 0 },
+    ]);
+    expect(out[0]).toMatchObject({ artist: "B", album: "Al2", coverUrl: "p2", vip: false });
+  });
+
+  it("parseNeteaseTrial maps freeTrialInfo to trial seconds", () => {
+    // 无试听（VIP/免费）
+    expect(parseNeteaseTrial({})).toBeUndefined();
+    expect(parseNeteaseTrial({ freeTrialInfo: null })).toBeUndefined();
+    // 标准秒
+    expect(parseNeteaseTrial({ freeTrialInfo: { start: 0, end: 30 } })).toBe(30);
+    expect(parseNeteaseTrial({ freeTrialInfo: { start: 5, end: 35 } })).toBe(30);
+    // 别名容忍 begin/trialBegin
+    expect(parseNeteaseTrial({ freeTrialInfo: { begin: 0, end: 30 } })).toBe(30);
+    // 毫秒兜底（end>1000）
+    expect(parseNeteaseTrial({ freeTrialInfo: { start: 0, end: 30000 } })).toBe(30);
+    // 异常 end<=start
+    expect(parseNeteaseTrial({ freeTrialInfo: { start: 0, end: 0 } })).toBeUndefined();
+  });
+});
+
+describe("NeteaseProvider.search pagination", () => {
+  function mockProvider() {
+    const p = new NeteaseProvider("http://x");
+    const get = vi.fn().mockResolvedValue({
+      data: { result: { songs: [], playlists: [], albums: [] } },
+    });
+    (p as any).api = { get };
+    return { p, get };
+  }
+
+  /** Find the /cloudsearch call whose params.type matches. */
+  function callByType(get: ReturnType<typeof vi.fn>, type: number) {
+    const call = get.mock.calls.find((c: any[]) => c[1]?.params?.type === type);
+    expect(call, `expected a /cloudsearch call with type=${type}`).toBeTruthy();
+    return call![1].params as Record<string, unknown>;
+  }
+
+  it("forwards offset for songs and uses real limit+offset for playlists/albums", async () => {
+    const { p, get } = mockProvider();
+    await p.search("hello", 20, 20);
+
+    // songs (type 1): offset forwarded, limit unchanged
+    const songs = callByType(get, 1);
+    expect(songs.limit).toBe(20);
+    expect(songs.offset).toBe(20);
+
+    // playlists (type 1000): limit-driven (NOT hardcoded 10) + offset
+    const playlists = callByType(get, 1000);
+    expect(playlists.limit).toBe(20);
+    expect(playlists.offset).toBe(20);
+
+    // albums (type 10): limit-driven (NOT hardcoded 10) + offset
+    const albums = callByType(get, 10);
+    expect(albums.limit).toBe(20);
+    expect(albums.offset).toBe(20);
+  });
+
+  it("defaults offset to 0 (backward compatible)", async () => {
+    const { p, get } = mockProvider();
+    await p.search("hello", 20);
+    expect(callByType(get, 1).offset).toBe(0);
+    expect(callByType(get, 1000).offset).toBe(0);
+    expect(callByType(get, 10).offset).toBe(0);
+  });
 });

src/music/netease.ts

@@ -2,6 +2,7 @@ import axios, { type AxiosInstance } from "axios";
 import type {
   MusicProvider,
   Song,
+  SongUrlResult,
   Playlist,
   PlaylistDetail,
   LyricLine,
@@ -68,6 +69,33 @@ export function mapNeteaseAlbums(raw: any[] | null | undefined): Album[] {
   }));
 }
 
+export function mapNeteaseSongs(raw: any[] | null | undefined): Song[] {
+  if (!Array.isArray(raw)) return [];
+  return raw.map((s: any) => ({
+    id: String(s.id),
+    name: s.name,
+    artist: (s.ar ?? s.artists ?? []).map((a: any) => a.name).join(" / "),
+    album: s.al?.name ?? s.album?.name ?? "",
+    duration: Math.round((s.dt ?? s.duration ?? 0) / 1000),
+    coverUrl: s.al?.picUrl ?? s.album?.picUrl ?? "",
+    platform: "netease",
+    // fee: 0=free, 1=VIP, 4=album-only, 8=free low-quality (plays in full, NOT vip)
+    vip: s.fee === 1 || s.fee === 4,
+  }));
+}
+
+/** 解析网易云 freeTrialInfo → 试听秒数；无片段（VIP/免费）返回 undefined。
+ *  真实字段 {start,end} 单位秒；容忍 begin/trialBegin 别名 + 毫秒兜底（end>1000）。 */
+export function parseNeteaseTrial(item: any): number | undefined {
+  const t = item?.freeTrialInfo;
+  if (!t || typeof t !== "object") return undefined;
+  const start = Number(t.start ?? t.begin ?? t.trialBegin ?? 0);
+  const end = Number(t.end ?? t.trialEnd);
+  if (!Number.isFinite(end) || end <= start) return undefined;
+  const secs = end > 1000 ? (end - start) / 1000 : end - start;
+  return Math.round(secs);
+}
+
 // NetEase quality levels: standard(128k) higher(192k) exhigh(320k) lossless(flac) hires(hi-res) jyeffect jymaster
 export const NETEASE_QUALITY_LEVELS = [
   { value: "standard", label: "标准 (128kbps)", bitrate: 128 },
@@ -103,35 +131,29 @@ export class NeteaseProvider implements MusicProvider {
     return this.cookie ? { cookie: this.cookie } : {};
   }
 
-  async search(query: string, limit = 20): Promise<SearchResult> {
+  async search(query: string, limit = 20, offset = 0): Promise<SearchResult> {
+    // /cloudsearch supports offset for every type. Songs, playlists (type 1000)
+    // and albums (type 10) are all limit/offset-driven so the web can page past
+    // the first page (playlists/albums were previously hardcoded to limit: 10).
     const [songRes, playlistRes, albumRes] = await Promise.all([
       this.api.get("/cloudsearch", {
-        params: { keywords: query, type: 1, limit, ...this.cookieParams },
+        params: { keywords: query, type: 1, limit, offset, ...this.cookieParams },
       }),
       this.api.get("/cloudsearch", {
         params: {
           keywords: query,
           type: 1000,
-          limit: 10,
+          limit,
+          offset,
           ...this.cookieParams,
         },
       }),
       this.api.get("/cloudsearch", {
-        params: { keywords: query, type: 10, limit: 10, ...this.cookieParams },
+        params: { keywords: query, type: 10, limit, offset, ...this.cookieParams },
       }),
     ]);
 
-    const songs: Song[] = (songRes.data?.result?.songs ?? []).map(
-      (s: any) => ({
-        id: String(s.id),
-        name: s.name,
-        artist: (s.ar ?? []).map((a: any) => a.name).join(" / "),
-        album: s.al?.name ?? "",
-        duration: Math.round((s.dt ?? 0) / 1000),
-        coverUrl: s.al?.picUrl ?? "",
-        platform: "netease",
-      })
-    );
+    const songs: Song[] = mapNeteaseSongs(songRes.data?.result?.songs);
 
     const playlists: Playlist[] = (
       playlistRes.data?.result?.playlists ?? []
@@ -148,44 +170,29 @@ export class NeteaseProvider implements MusicProvider {
     return { songs, playlists, albums };
   }
 
-  async getSongUrl(songId: string, quality?: string): Promise<string | null> {
+  async getSongUrl(songId: string, quality?: string): Promise<SongUrlResult | null> {
     const level = quality ?? this.quality;
     const res = await this.api.get("/song/url/v1", {
       params: { id: songId, level, ...this.cookieParams },
     });
-    return res.data?.data?.[0]?.url ?? null;
+    const item = res.data?.data?.[0];
+    const url = item?.url;
+    if (!url) return null;
+    return { url, trialDuration: parseNeteaseTrial(item) };
   }
 
   async getSongDetail(songId: string): Promise<Song | null> {
     const res = await this.api.get("/song/detail", {
       params: { ids: songId, ...this.cookieParams },
     });
-    const s = res.data?.songs?.[0];
-    if (!s) return null;
-    return {
-      id: String(s.id),
-      name: s.name,
-      artist: (s.ar ?? []).map((a: any) => a.name).join(" / "),
-      album: s.al?.name ?? "",
-      duration: Math.round((s.dt ?? 0) / 1000),
-      coverUrl: s.al?.picUrl ?? "",
-      platform: "netease",
-    };
+    return mapNeteaseSongs(res.data?.songs)[0] ?? null;
   }
 
   async getPlaylistSongs(playlistId: string): Promise<Song[]> {
     const res = await this.api.get("/playlist/track/all", {
       params: { id: playlistId, ...this.cookieParams },
     });
-    return (res.data?.songs ?? []).map((s: any) => ({
-      id: String(s.id),
-      name: s.name,
-      artist: (s.ar ?? []).map((a: any) => a.name).join(" / "),
-      album: s.al?.name ?? "",
-      duration: Math.round((s.dt ?? 0) / 1000),
-      coverUrl: s.al?.picUrl ?? "",
-      platform: "netease",
-    }));
+    return mapNeteaseSongs(res.data?.songs);
   }
 
   async getRecommendPlaylists(): Promise<Playlist[]> {
@@ -205,15 +212,7 @@ export class NeteaseProvider implements MusicProvider {
     const res = await this.api.get("/album", {
       params: { id: albumId, ...this.cookieParams },
     });
-    return (res.data?.songs ?? []).map((s: any) => ({
-      id: String(s.id),
-      name: s.name,
-      artist: (s.ar ?? []).map((a: any) => a.name).join(" / "),
-      album: s.al?.name ?? "",
-      duration: Math.round((s.dt ?? 0) / 1000),
-      coverUrl: s.al?.picUrl ?? "",
-      platform: "netease",
-    }));
+    return mapNeteaseSongs(res.data?.songs);
   }
 
   async getLyrics(songId: string): Promise<LyricLine[]> {
@@ -312,30 +311,14 @@ export class NeteaseProvider implements MusicProvider {
     const res = await this.api.get("/personal_fm", {
       params: { ...this.cookieParams },
     });
-    return (res.data?.data ?? []).map((s: any) => ({
-      id: String(s.id),
-      name: s.name,
-      artist: (s.artists ?? []).map((a: any) => a.name).join(" / "),
-      album: s.album?.name ?? "",
-      duration: Math.round((s.duration ?? 0) / 1000),
-      coverUrl: s.album?.picUrl ?? "",
-      platform: "netease",
-    }));
+    return mapNeteaseSongs(res.data?.data);
   }
 
   async getDailyRecommendSongs(): Promise<Song[]> {
     const res = await this.api.get("/recommend/songs", {
       params: { ...this.cookieParams },
     });
-    return (res.data?.data?.dailySongs ?? []).map((s: any) => ({
-      id: String(s.id),
-      name: s.name,
-      artist: (s.ar ?? []).map((a: any) => a.name).join(" / "),
-      album: s.al?.name ?? "",
-      duration: Math.round((s.dt ?? 0) / 1000),
-      coverUrl: s.al?.picUrl ?? "",
-      platform: "netease",
-    }));
+    return mapNeteaseSongs(res.data?.data?.dailySongs);
   }
 
   async getPlaylistDetail(playlistId: string): Promise<PlaylistDetail | null> {

src/music/provider.ts

@@ -1,3 +1,15 @@
+/** All music source platforms. Jellyfin ItemIds are GUID strings — never
+ *  assume numeric ids when handling a generic Platform. */
+export type Platform =
+  | "netease"
+  | "qq"
+  | "bilibili"
+  | "youtube"
+  | "local"
+  | "kugou"
+  | "spotify"
+  | "jellyfin";
+
 export interface Song {
   id: string;
   name: string;
@@ -5,19 +17,29 @@ export interface Song {
   album: string;
   duration: number; // seconds
   coverUrl: string;
-  platform: "netease" | "qq" | "bilibili" | "youtube";
+  platform: Platform;
+  /** VIP / copyright-restricted: non-VIP users can only play a trial fragment
+   *  (NetEase fee=1 VIP / fee=4 album-only, or QQ pay.payplay/paytrackprice=1). */
+  vip?: boolean;
 }
 
 export interface SongWithUrl extends Song {
   url: string;
 }
 
+/** getSongUrl 解析结果。trialDuration 缺省 = 完整可播放（VIP 账号 / 免费曲）。 */
+export interface SongUrlResult {
+  url: string;
+  /** 试听片段时长（秒）。VIP/免费曲为 undefined → 调用方回退完整 duration。 */
+  trialDuration?: number;
+}
+
 export interface Playlist {
   id: string;
   name: string;
   coverUrl: string;
   songCount: number;
-  platform: "netease" | "qq" | "bilibili" | "youtube";
+  platform: Platform;
 }
 
 export interface PlaylistDetail {
@@ -34,7 +56,7 @@ export interface Album {
   artist: string;
   coverUrl: string;
   songCount: number;
-  platform: "netease" | "qq" | "bilibili" | "youtube";
+  platform: Platform;
 }
 
 export interface LyricLine {
@@ -62,10 +84,10 @@ export interface AuthStatus {
 }
 
 export interface MusicProvider {
-  readonly platform: "netease" | "qq" | "bilibili" | "youtube";
+  readonly platform: Platform;
 
-  search(query: string, limit?: number): Promise<SearchResult>;
-  getSongUrl(songId: string, quality?: string): Promise<string | null>;
+  search(query: string, limit?: number, offset?: number): Promise<SearchResult>;
+  getSongUrl(songId: string, quality?: string): Promise<SongUrlResult | null>;
   setQuality(quality: string): void;
   getQuality(): string;
   getSongDetail(songId: string): Promise<Song | null>;

src/music/qq.test.ts

@@ -1,7 +1,67 @@
-import { describe, it, expect } from "vitest";
-import { mapQqAlbums } from "./qq.js";
+import { describe, it, expect, vi, beforeEach } from "vitest";
+
+// All axios.create(...) instances in qq.ts (qqMusicuApi / qqSearchApi / qqFavApi
+// and the per-instance api) share this single mock so the search test can
+// inspect the outgoing params/body regardless of which client issued them.
+const { mockGet, mockPost } = vi.hoisted(() => ({ mockGet: vi.fn(), mockPost: vi.fn() }));
+vi.mock("axios", () => ({
+  default: { create: () => ({ get: mockGet, post: mockPost }) },
+}));
+
+import { mapQqAlbums, mapQqSongs, parseQqTrial, QQMusicProvider } from "./qq.js";
 
 describe("QQ adapter", () => {
+  it("mapQqSongs maps QQMusicApi-style song entries", () => {
+    const out = mapQqSongs([
+      {
+        mid: "001abc",
+        name: "Radar Song",
+        singer: [{ name: "Singer A" }, { name: "Singer B" }],
+        album: { name: "Album A", mid: "alb001" },
+        interval: 243,
+      },
+    ]);
+
+    expect(out).toEqual([
+      {
+        id: "001abc",
+        name: "Radar Song",
+        artist: "Singer A / Singer B",
+        album: "Album A",
+        duration: 243,
+        coverUrl: "https://y.gtimg.cn/music/photo_new/T002R300x300M000alb001.jpg",
+        platform: "qq",
+        vip: false,
+      },
+    ]);
+  });
+
+  it("mapQqSongs maps pay field to vip flag", () => {
+    const out = mapQqSongs([
+      { mid: "v1", name: "VIP playplay", singer: [], album: {}, interval: 100, pay: { payplay: 1, paytrackprice: 0 } },
+      { mid: "v2", name: "VIP trackprice", singer: [], album: {}, interval: 100, pay: { payplay: 0, paytrackprice: 1 } },
+      { mid: "f1", name: "Free", singer: [], album: {}, interval: 100, pay: { payplay: 0, paytrackprice: 0 } },
+      { mid: "f2", name: "No pay field", singer: [], album: {}, interval: 100 },
+    ]);
+    expect(out[0].vip).toBe(true);
+    expect(out[1].vip).toBe(true);
+    expect(out[2].vip).toBe(false);
+    expect(out[3].vip).toBe(false);
+  });
+
+  it("parseQqTrial maps isTryout/tryout to trial seconds", () => {
+    // 非试听（VIP/免费）
+    expect(parseQqTrial({ isTryout: 0 })).toBeUndefined();
+    expect(parseQqTrial({})).toBeUndefined();
+    // 试听（秒）
+    expect(parseQqTrial({ isTryout: 1, tryBegin: 0, tryEnd: 30 })).toBe(30);
+    expect(parseQqTrial({ tryout: true, begin: 0, end: 45 })).toBe(45);
+    // 毫秒兜底
+    expect(parseQqTrial({ isTryout: 1, tryBegin: 0, tryEnd: 30000 })).toBe(30);
+    // 异常
+    expect(parseQqTrial({ isTryout: 1, tryEnd: 0 })).toBeUndefined();
+  });
+
   it("mapQqAlbums maps albumMID-style raw entries", () => {
     const raw = [
       {
@@ -41,3 +101,74 @@ describe("QQ adapter", () => {
     expect(out[0].id).toBe("");
   });
 });
+
+describe("QQMusicProvider.search pagination", () => {
+  beforeEach(() => {
+    mockGet.mockReset();
+    mockPost.mockReset();
+  });
+
+  /** musicu.fcg returns one song → primary path succeeds. */
+  function musicuOk() {
+    mockGet.mockImplementation(async (url: string) => {
+      if (url === "/cgi-bin/musicu.fcg") {
+        return {
+          data: {
+            req_0: { data: { body: { song: { list: [{ mid: "m1", name: "S", singer: [], album: {}, interval: 100 }] } } } },
+            req_album: { data: { body: { album: { list: [] } } } },
+            req_playlist: { data: { body: { songlist: { list: [] } } } },
+          },
+        };
+      }
+      return { data: {} };
+    });
+  }
+
+  function musicuReqData() {
+    const call = mockGet.mock.calls.find((c: any[]) => c[0] === "/cgi-bin/musicu.fcg");
+    expect(call, "expected a musicu.fcg call").toBeTruthy();
+    return JSON.parse(call![1].params.data);
+  }
+
+  it("adds page_num (offset/limit+1) and limit-driven num_per_page for songs/albums/playlists", async () => {
+    musicuOk();
+    const p = new QQMusicProvider("http://x");
+    await p.search("hello", 20, 20); // page 2
+
+    const d = musicuReqData();
+    expect(d.req_0.param.page_num).toBe(2);
+    expect(d.req_0.param.num_per_page).toBe(20);
+    // Albums/playlists: num_per_page must be limit-driven (NOT hardcoded 10).
+    expect(d.req_album.param.page_num).toBe(2);
+    expect(d.req_album.param.num_per_page).toBe(20);
+    expect(d.req_playlist.param.page_num).toBe(2);
+    expect(d.req_playlist.param.num_per_page).toBe(20);
+  });
+
+  it("defaults offset to 0 → page_num 1 (backward compatible)", async () => {
+    musicuOk();
+    const p = new QQMusicProvider("http://x");
+    await p.search("hello", 20);
+    const d = musicuReqData();
+    expect(d.req_0.param.page_num).toBe(1);
+  });
+
+  it("fallback client_search_cp sets p to the page cursor", async () => {
+    // musicu returns no songs → primary returns null → fallback runs.
+    mockGet.mockImplementation(async (url: string) => {
+      if (url === "/cgi-bin/musicu.fcg") {
+        return { data: { req_0: { data: { body: { song: { list: [] } } } } } };
+      }
+      // client_search_cp
+      return { data: { data: { song: { list: [] }, album: { list: [] } } } };
+    });
+    const p = new QQMusicProvider("http://x");
+    await p.search("hello", 20, 20); // page 2
+
+    const songCall = mockGet.mock.calls.find(
+      (c: any[]) => c[0] === "/soso/fcgi-bin/client_search_cp" && c[1]?.params?.type === 0
+    );
+    expect(songCall, "expected a client_search_cp song call").toBeTruthy();
+    expect(songCall![1].params.p).toBe(2);
+  });
+});

src/music/qq.ts

@@ -2,6 +2,7 @@ import axios, { type AxiosInstance } from "axios";
 import type {
   MusicProvider,
   Song,
+  SongUrlResult,
   Playlist,
   PlaylistDetail,
   LyricLine,
@@ -39,6 +40,37 @@ const qqFavApi = axios.create({
   headers: { referer: "https://y.qq.com/" },
 });
 
+export function mapQqSongs(raw: any[] | null | undefined): Song[] {
+  if (!Array.isArray(raw)) return [];
+  return raw.map((s) => {
+    const albumMid = s.album?.mid ?? s.album?.pmid ?? s.albummid ?? s.albumMid ?? "";
+    return {
+      id: String(s.mid ?? s.songmid ?? s.songMID ?? s.id ?? s.songid ?? s.songId ?? ""),
+      name: s.title ?? s.name ?? s.songname ?? "",
+      artist: (s.singer ?? s.singers ?? []).map((a: any) => a.name ?? a.title ?? "").filter(Boolean).join(" / "),
+      album: s.album?.name ?? s.album?.title ?? s.albumname ?? "",
+      duration: s.interval ?? Math.round((s.duration ?? 0) / 1000),
+      coverUrl: albumMid
+        ? `https://y.gtimg.cn/music/photo_new/T002R300x300M000${albumMid}.jpg`
+        : "",
+      platform: "qq" as const,
+      vip: s.pay?.payplay === 1 || s.pay?.paytrackprice === 1 || false,
+    };
+  }).filter((s) => s.id);
+}
+
+/** 解析 QQ 试听标记 → 试听秒数；非试听（VIP/免费）返回 undefined。
+ *  字段 isTryout===1 / tryout===true + tryBegin/tryEnd；容忍 begin/start 别名 + 毫秒兜底。 */
+export function parseQqTrial(playUrl: any): number | undefined {
+  if (!playUrl || typeof playUrl !== "object") return undefined;
+  if (playUrl.isTryout !== 1 && playUrl.tryout !== true) return undefined;
+  const begin = Number(playUrl.tryBegin ?? playUrl.begin ?? playUrl.start ?? 0);
+  const end = Number(playUrl.tryEnd ?? playUrl.end);
+  if (!Number.isFinite(end) || end <= begin) return undefined;
+  const secs = end > 1000 ? (end - begin) / 1000 : end - begin;
+  return Math.round(secs);
+}
+
 export function mapQqAlbums(raw: any[] | null | undefined): Album[] {
   if (!Array.isArray(raw)) return [];
   return raw.map((a) => {
@@ -72,6 +104,7 @@ export class QQMusicProvider implements MusicProvider {
   private api: AxiosInstance;
   private cookie = "";
   private quality = "exhigh";
+  private radarPage = 1;
 
   constructor(baseUrl: string) {
     this.api = axios.create({
@@ -92,16 +125,40 @@ export class QQMusicProvider implements MusicProvider {
     return this.cookie ? { cookie: this.cookie } : {};
   }
 
-  async search(query: string, limit = 20): Promise<SearchResult> {
+  private get directCookieHeaders(): Record<string, string> {
+    return this.cookie ? { Cookie: this.cookie } : {};
+  }
+
+  private buildMusicuPayload(module: string, method: string, param: Record<string, unknown>): Record<string, unknown> {
+    const uinMatch = /(?:^|; )(?:uin|qqmusic_uin)=o?0?(\d+)/.exec(this.cookie);
+    const pSkeyMatch = /(?:^|; )p_skey=([^;]+)/.exec(this.cookie);
+    return {
+      comm: {
+        ct: 24,
+        cv: 4747474,
+        platform: "yqq.json",
+        uin: uinMatch ? uinMatch[1] : "0",
+        g_tk: pSkeyMatch ? computeGtk(pSkeyMatch[1]) : 5381,
+        format: "json",
+        inCharset: "utf-8",
+        outCharset: "utf-8",
+        notice: 0,
+        need_new_code: 1,
+      },
+      req_0: { module, method, param },
+    };
+  }
+
+  async search(query: string, limit = 20, offset = 0): Promise<SearchResult> {
     // Primary: u.y.qq.com/cgi-bin/musicu.fcg — supports songs + albums +
     // playlists. Fixed per https://github.com/ZHANGTIANYAO1/teamspeak-music-bot/issues/61
     // (removed searchid, num_per_page >= 10, corrected search_type values).
-    const primary = await this.searchViaMusicuFcg(query, limit);
+    const primary = await this.searchViaMusicuFcg(query, limit, offset);
     if (primary) return primary;
 
     // Fallback: c.y.qq.com/soso/fcgi-bin/client_search_cp (song + album,
     // no playlist support). Kept as redundancy.
-    return this.searchViaClientSearchCp(query, limit);
+    return this.searchViaClientSearchCp(query, limit, offset);
   }
 
   /** Primary search via u.y.qq.com/cgi-bin/musicu.fcg.
@@ -112,25 +169,31 @@ export class QQMusicProvider implements MusicProvider {
    *   3. `search_type: 2` for albums, `3` for playlists (8 was "user"). */
   private async searchViaMusicuFcg(
     query: string,
-    limit: number
+    limit: number,
+    offset = 0
   ): Promise<SearchResult | null> {
     try {
+      // num_per_page must stay >= 10 (lower values return empty). It is now
+      // limit-driven for ALL three lists (albums/playlists were hardcoded to
+      // 10). page_num is the offset cursor; the web always requests in
+      // limit-aligned pages so offset is a multiple of limit.
       const numPerPage = Math.max(10, Math.min(limit, 50));
+      const pageNum = Math.floor(offset / limit) + 1;
       const reqData = JSON.stringify({
         req_0: {
           module: "music.search.SearchCgiService",
           method: "DoSearchForQQMusicDesktop",
-          param: { query, num_per_page: numPerPage, search_type: 0 },
+          param: { query, num_per_page: numPerPage, page_num: pageNum, search_type: 0 },
         },
         req_album: {
           module: "music.search.SearchCgiService",
           method: "DoSearchForQQMusicDesktop",
-          param: { query, num_per_page: 10, search_type: 2 },
+          param: { query, num_per_page: numPerPage, page_num: pageNum, search_type: 2 },
         },
         req_playlist: {
           module: "music.search.SearchCgiService",
           method: "DoSearchForQQMusicDesktop",
-          param: { query, num_per_page: 10, search_type: 3 },
+          param: { query, num_per_page: numPerPage, page_num: pageNum, search_type: 3 },
         },
       });
       const res = await qqMusicuApi.get("/cgi-bin/musicu.fcg", {
@@ -141,17 +204,7 @@ export class QQMusicProvider implements MusicProvider {
         res.data?.req_0?.data?.body?.song?.list ?? [];
       if (songList.length === 0) return null;
 
-      const songs: Song[] = songList.map((s: any) => ({
-        id: String(s.mid ?? s.id),
-        name: s.title ?? s.name ?? "",
-        artist: (s.singer ?? []).map((a: any) => a.name).join(" / "),
-        album: s.album?.name ?? s.album?.title ?? "",
-        duration: s.interval ?? 0,
-        coverUrl: s.album?.mid
-          ? `https://y.gtimg.cn/music/photo_new/T002R300x300M000${s.album.mid}.jpg`
-          : "",
-        platform: "qq",
-      }));
+      const songs = mapQqSongs(songList);
 
       const albumList: any[] = res.data?.req_album?.data?.body?.album?.list ?? [];
       const albums = mapQqAlbums(albumList);
@@ -174,12 +227,16 @@ export class QQMusicProvider implements MusicProvider {
   /** Fallback search via c.y.qq.com/soso/fcgi-bin/client_search_cp */
   private async searchViaClientSearchCp(
     query: string,
-    limit: number
+    limit: number,
+    offset = 0
   ): Promise<SearchResult> {
+    // `p` is the 1-based page cursor. The web pages in limit-aligned steps so
+    // offset is a multiple of limit.
+    const page = Math.floor(offset / limit) + 1;
     const songParams = {
       w: query,
       format: "json",
-      p: 1,
+      p: page,
       n: Math.min(limit, 50),
       type: 0,
       cr: 1,
@@ -187,7 +244,7 @@ export class QQMusicProvider implements MusicProvider {
     const albumParams = {
       w: query,
       format: "json",
-      p: 1,
+      p: page,
       n: 5,
       t: 8,
       cr: 1,
@@ -203,17 +260,7 @@ export class QQMusicProvider implements MusicProvider {
         ? (songRes.value.data?.data?.song?.list ?? [])
         : [];
 
-    const songs: Song[] = songList.map((s: any) => ({
-      id: String(s.songmid ?? s.songid ?? ""),
-      name: s.songname ?? s.name ?? "",
-      artist: (s.singer ?? []).map((a: any) => a.name).join(" / "),
-      album: s.albumname ?? s.album?.name ?? "",
-      duration: s.interval ?? 0,
-      coverUrl: s.albummid
-        ? `https://y.gtimg.cn/music/photo_new/T002R300x300M000${s.albummid}.jpg`
-        : "",
-      platform: "qq",
-    }));
+    const songs = mapQqSongs(songList);
 
     const albumList: any[] =
       albumRes.status === "fulfilled"
@@ -224,13 +271,13 @@ export class QQMusicProvider implements MusicProvider {
     return { songs, playlists: [], albums };
   }
 
-  async getSongUrl(songId: string, quality?: string): Promise<string | null> {
+  async getSongUrl(songId: string, quality?: string): Promise<SongUrlResult | null> {
     try {
       const res = await this.api.get("/getMusicPlay", {
         params: { songmid: songId, quality: quality ?? this.quality, ...this.cookieParams },
       });
       const playUrl = res.data?.data?.playUrl?.[songId];
-      if (playUrl?.url) return playUrl.url;
+      if (playUrl?.url) return { url: playUrl.url, trialDuration: parseQqTrial(playUrl) };
     } catch {
       // try with songid
       try {
@@ -238,7 +285,7 @@ export class QQMusicProvider implements MusicProvider {
           params: { songid: songId, quality: quality ?? this.quality, ...this.cookieParams },
         });
         const playUrl = res.data?.data?.playUrl?.[songId];
-        if (playUrl?.url) return playUrl.url;
+        if (playUrl?.url) return { url: playUrl.url, trialDuration: parseQqTrial(playUrl) };
       } catch {
         // ignore
       }
@@ -317,8 +364,18 @@ export class QQMusicProvider implements MusicProvider {
         };
       }
     } catch {
-      // fall through to stub
+      // fall through to musicu.fcg fallback
     }
+
+    // Fallback: fetch metadata via u.y.qq.com/cgi-bin/musicu.fcg. The bundled
+    // library's /getSongInfo route is broken (upstream code 500001), so the
+    // primary try above almost always falls through here for QQ. Without this,
+    // play-by-id songs carry an empty name → the TS nickname / now-playing
+    // message renders as "♪ 正在播放:  -  []". This endpoint (same host/shape
+    // as search) reliably returns full track_info without requiring login.
+    const detail = await this.fetchSongDetailViaMusicu(songId);
+    if (detail) return detail;
+
     // Minimal stub — resolveAndPlay only needs id + platform to fetch a
     // play URL. Name/artist/album will be empty in play history, but the
     // song will actually play, which is the important part.
@@ -333,25 +390,49 @@ export class QQMusicProvider implements MusicProvider {
     };
   }
 
+  /** Fetch a single song's metadata via u.y.qq.com/cgi-bin/musicu.fcg
+   * (module music.pf_song_detail_svr / get_song_detail_yqq). This mirrors the
+   * search path's host + request shape and, unlike the library's /getSongInfo,
+   * actually works against QQ's current API. Returns null on any failure so the
+   * caller can fall back to the minimal stub. */
+  private async fetchSongDetailViaMusicu(songId: string): Promise<Song | null> {
+    try {
+      const reqData = JSON.stringify({
+        req_0: {
+          module: "music.pf_song_detail_svr",
+          method: "get_song_detail_yqq",
+          param: { song_mid: songId, song_type: 0 },
+        },
+      });
+      const res = await qqMusicuApi.get("/cgi-bin/musicu.fcg", {
+        params: { format: "json", data: reqData },
+      });
+      const t = res.data?.req_0?.data?.track_info;
+      if (!t) return null;
+      const albumMid = t.album?.mid ?? t.album?.pmid ?? "";
+      return {
+        id: String(t.mid ?? t.id ?? songId),
+        name: t.name ?? t.title ?? "",
+        artist: (t.singer ?? []).map((a: any) => a.name ?? a.title ?? "").filter(Boolean).join(" / "),
+        album: t.album?.name ?? t.album?.title ?? "",
+        duration: t.interval ?? 0,
+        coverUrl: albumMid
+          ? `https://y.gtimg.cn/music/photo_new/T002R300x300M000${albumMid}.jpg`
+          : "",
+        platform: "qq",
+      };
+    } catch {
+      return null;
+    }
+  }
+
   async getPlaylistSongs(playlistId: string): Promise<Song[]> {
     const res = await this.api.get("/getSongListDetail", {
       params: { disstid: playlistId, ...this.cookieParams },
     });
     const cdlist = res.data?.response?.cdlist ?? [];
     if (cdlist.length === 0) return [];
-    return (cdlist[0].songlist ?? []).map((s: any) => ({
-      id: String(s.mid ?? s.songmid ?? s.songid),
-      name: s.songname ?? s.name ?? "",
-      artist: (s.singer ?? []).map((a: any) => a.name).join(" / "),
-      album: s.albumname ?? "",
-      duration: s.interval ?? 0,
-      coverUrl: s.album?.mid
-        ? `https://y.gtimg.cn/music/photo_new/T002R300x300M000${s.album.mid}.jpg`
-        : s.albummid
-        ? `https://y.gtimg.cn/music/photo_new/T002R300x300M000${s.albummid}.jpg`
-        : "",
-      platform: "qq",
-    }));
+    return mapQqSongs(cdlist[0].songlist ?? []);
   }
 
   async getPlaylistDetail(playlistId: string): Promise<PlaylistDetail | null> {
@@ -386,17 +467,7 @@ export class QQMusicProvider implements MusicProvider {
     const res = await this.api.get("/getAlbumInfo", {
       params: { albummid: albumId, ...this.cookieParams },
     });
-    return (res.data?.response?.data?.list ?? []).map((s: any) => ({
-      id: String(s.songmid ?? s.songid),
-      name: s.songname ?? "",
-      artist: (s.singer ?? []).map((a: any) => a.name).join(" / "),
-      album: s.albumname ?? "",
-      duration: s.interval ?? 0,
-      coverUrl: s.albummid
-        ? `https://y.gtimg.cn/music/photo_new/T002R300x300M000${s.albummid}.jpg`
-        : "",
-      platform: "qq",
-    }));
+    return mapQqSongs(res.data?.response?.data?.list ?? []);
   }
 
   async getLyrics(songId: string): Promise<LyricLine[]> {
@@ -461,6 +532,9 @@ export class QQMusicProvider implements MusicProvider {
 
   setCookie(cookie: string): void {
     this.cookie = cookie;
+    // Reset radar pagination so a re-login (different account) starts from the
+    // first page rather than inheriting the previous account's cursor.
+    this.radarPage = 1;
   }
 
   getCookie(): string {
@@ -516,12 +590,72 @@ export class QQMusicProvider implements MusicProvider {
           ? `https://y.gtimg.cn/music/photo_new/T002R300x300M000${s.album.mid}.jpg`
           : "",
         platform: "qq",
+        vip: s.pay?.payplay === 1 || s.pay?.paytrackprice === 1 || false,
       }));
     } catch {
       return [];
     }
   }
 
+  async getPersonalFm(): Promise<Song[]> {
+    const radarSongs = await this.getRadarRecommendSongs();
+    if (radarSongs.length > 0) return radarSongs;
+    return this.getGuessRecommendSongs();
+  }
+
+  private async getRadarRecommendSongs(): Promise<Song[]> {
+    try {
+      const page = this.radarPage;
+      const res = await qqMusicuApi.post(
+        "/cgi-bin/musicu.fcg",
+        this.buildMusicuPayload(
+          "music.recommend.TrackRelationServer",
+          "GetRadarSong",
+          {
+            Page: page,
+            ReqType: 0,
+            FavSongs: [],
+            EntranceSongs: [],
+          }
+        ),
+        { headers: { referer: "https://y.qq.com/", ...this.directCookieHeaders } }
+      );
+      const tracks = (res.data?.req_0?.data?.VecSongs ?? [])
+        .map((item: any) => item?.Track)
+        .filter(Boolean);
+      const songs = mapQqSongs(tracks);
+      if (songs.length > 0) {
+        this.radarPage = page + 1;
+      }
+      return songs;
+    } catch {
+      return [];
+    }
+  }
+
+  private async getGuessRecommendSongs(): Promise<Song[]> {
+    try {
+      const res = await qqMusicuApi.post(
+        "/cgi-bin/musicu.fcg",
+        this.buildMusicuPayload(
+          "music.radioProxy.MbTrackRadioSvr",
+          "get_radio_track",
+          {
+            id: 99,
+            num: 5,
+            from: 0,
+            scene: 0,
+            song_ids: [],
+          }
+        ),
+        { headers: { referer: "https://y.qq.com/", ...this.directCookieHeaders } }
+      );
+      return mapQqSongs(res.data?.req_0?.data?.Tracks ?? []);
+    } catch {
+      return [];
+    }
+  }
+
   async getUserPlaylists(): Promise<Playlist[]> {
     if (!this.cookie) return [];
     const uinMatch = /(?:^|; )uin=o?0?(\d+)/.exec(this.cookie);

src/music/spotify/backend-select.test.ts

@@ -0,0 +1,12 @@
+import { describe, it, expect } from "vitest";
+import { resolveSpotifyBackendKind as pick } from "./backend-select.js";
+describe("resolveSpotifyBackendKind", () => {
+  it("auto: go present -> go-librespot", () => expect(pick("auto", true, true)).toBe("go-librespot"));
+  it("auto: go absent, rust present -> librespot", () => expect(pick("auto", false, true)).toBe("librespot"));
+  it("auto: neither -> null", () => expect(pick("auto", false, false)).toBeNull());
+  it("go-librespot: present -> go-librespot", () => expect(pick("go-librespot", true, true)).toBe("go-librespot"));
+  it("go-librespot: absent -> null even if rust present", () => expect(pick("go-librespot", false, true)).toBeNull());
+  it("librespot: present -> librespot", () => expect(pick("librespot", true, true)).toBe("librespot"));
+  it("librespot: absent -> null even if go present", () => expect(pick("librespot", true, false)).toBeNull());
+  it("auto default fallthrough matches auto", () => expect(pick("auto", true, false)).toBe("go-librespot"));
+});

src/music/spotify/backend-select.ts

@@ -0,0 +1,25 @@
+/** Which concrete backend runs for a given config + host binary availability. */
+export type SpotifyBackendKind = "go-librespot" | "librespot";
+
+/**
+ * Pure backend selection shared by SpotifyController.chooseBackend() (per-bot)
+ * and the web /status endpoint (process-wide). Booleans in, no IO — the caller
+ * supplies platform+binary presence.
+ */
+export function resolveSpotifyBackendKind(
+  backend: "auto" | "go-librespot" | "librespot",
+  goPresent: boolean,
+  rustPresent: boolean,
+): SpotifyBackendKind | null {
+  switch (backend) {
+    case "go-librespot":
+      return goPresent ? "go-librespot" : null;
+    case "librespot":
+      return rustPresent ? "librespot" : null;
+    case "auto":
+    default:
+      if (goPresent) return "go-librespot";
+      if (rustPresent) return "librespot";
+      return null;
+  }
+}

src/music/spotify/backend.ts

@@ -0,0 +1,41 @@
+// src/music/spotify/backend.ts
+// Type contract for the Spotify audio backend (go-librespot sidecar).
+// Interface-only: this module intentionally contains NO runtime code so it
+// can be imported for types by go-librespot.ts and controller.ts without
+// pulling in child_process/ws/ffmpeg at type-check time.
+
+/** Emitted when the currently playing Spotify track finishes or is stopped. */
+export interface SpotifyTrackEndedEvent {
+  uri: string;
+  reason: "ended" | "stopped" | "error";
+}
+
+/** Now-playing metadata surfaced from the go-librespot "metadata" event. */
+export interface SpotifyNowPlaying {
+  uri: string;
+  name: string;
+  artist: string;
+  album: string;
+  coverUrl: string;
+  durationMs: number;
+}
+
+/**
+ * Long-lived Spotify audio source: owns the go-librespot sidecar + FIFO->ffmpeg
+ * PCM pipe and exposes transport control plus a continuous 48kHz s16le stereo
+ * PCM stream to feed AudioPlayer.playPcmStream().
+ */
+export interface SpotifyAudioBackend {
+  start(): Promise<void>;
+  stop(): void;
+  isReady(): boolean;
+  playTrack(uri: string): Promise<void>;
+  pause(): Promise<void>;
+  resume(): Promise<void>;
+  seek(ms: number): Promise<void>;
+  getPcmStream(): import("node:stream").Readable;
+  getPositionMs(): number;
+  on(event: "trackEnded", cb: (e: SpotifyTrackEndedEvent) => void): void;
+  on(event: "metadata", cb: (m: SpotifyNowPlaying) => void): void;
+  on(event: "ready" | "error", cb: (arg?: unknown) => void): void;
+}

src/music/spotify/binary.test.ts

@@ -0,0 +1,363 @@
+import { describe, it, expect, vi, afterEach } from "vitest";
+import { join } from "node:path";
+import { mkdtempSync, writeFileSync, rmSync } from "node:fs";
+import { tmpdir } from "node:os";
+import {
+  isGoLibrespotSupported,
+  pickGoLibrespotPath,
+  findGoLibrespot,
+  checkGoLibrespotAvailable,
+  resetGoLibrespotBinaryCache,
+  __setGoLibrespotVersionProbe,
+  isRustLibrespotSupported,
+  pickLibrespotPath,
+  findLibrespot,
+  checkLibrespotAvailable,
+  resetLibrespotBinaryCache,
+  __setLibrespotVersionProbe,
+  resolveExecutable,
+  isLibrespotPresent,
+  isGoLibrespotPresent,
+} from "./binary.js";
+
+const origPlatform = process.platform;
+function setPlatform(p: NodeJS.Platform): void {
+  Object.defineProperty(process, "platform", { value: p, configurable: true });
+}
+
+// Snapshot the PATH env so PATH-resolution tests can point it at temp dirs and
+// restore afterwards. PATHEXT is optional (undefined on posix); track presence.
+const origPath = process.env.PATH;
+const origPathExt = process.env.PATHEXT;
+const tmpDirs: string[] = [];
+function mkTmpDir(prefix: string): string {
+  const dir = mkdtempSync(join(tmpdir(), prefix));
+  tmpDirs.push(dir);
+  return dir;
+}
+
+afterEach(() => {
+  setPlatform(origPlatform);
+  __setGoLibrespotVersionProbe(null);
+  resetGoLibrespotBinaryCache();
+  __setLibrespotVersionProbe(null);
+  resetLibrespotBinaryCache();
+  process.env.PATH = origPath;
+  if (origPathExt === undefined) delete process.env.PATHEXT;
+  else process.env.PATHEXT = origPathExt;
+  for (const dir of tmpDirs.splice(0)) {
+    try {
+      rmSync(dir, { recursive: true, force: true });
+    } catch {
+      /* ignore */
+    }
+  }
+});
+
+describe("isGoLibrespotSupported", () => {
+  it("is true only on linux", () => {
+    setPlatform("linux");
+    expect(isGoLibrespotSupported()).toBe(true);
+    setPlatform("win32");
+    expect(isGoLibrespotSupported()).toBe(false);
+    setPlatform("darwin");
+    expect(isGoLibrespotSupported()).toBe(false);
+  });
+});
+
+describe("pickGoLibrespotPath (bin/ then PATH ordering)", () => {
+  const binPath = join("some", "root", "bin", "go-librespot");
+
+  it("prefers the bin/ path when the file exists", () => {
+    expect(
+      pickGoLibrespotPath([binPath, "go-librespot"], (p) => p === binPath),
+    ).toBe(binPath);
+  });
+
+  it("falls through to the bare PATH name when the bin/ file is missing", () => {
+    expect(pickGoLibrespotPath([binPath, "go-librespot"], () => false)).toBe(
+      "go-librespot",
+    );
+  });
+
+  it("returns bare command names without touching the filesystem", () => {
+    const exists = vi.fn(() => false);
+    expect(pickGoLibrespotPath(["go-librespot"], exists)).toBe("go-librespot");
+    expect(exists).not.toHaveBeenCalled();
+  });
+});
+
+describe("findGoLibrespot", () => {
+  it("returns the bare command name when bin/go-librespot is absent", () => {
+    // No go-librespot binary is committed under bin/, so resolution must
+    // fall back to the bare PATH name (execFile resolves it at run time).
+    expect(findGoLibrespot()).toBe("go-librespot");
+  });
+});
+
+describe("checkGoLibrespotAvailable", () => {
+  it("returns false immediately on unsupported platforms without probing", async () => {
+    setPlatform("darwin");
+    const probe = vi.fn(async () => {});
+    __setGoLibrespotVersionProbe(probe);
+    expect(await checkGoLibrespotAvailable()).toBe(false);
+    expect(probe).not.toHaveBeenCalled();
+  });
+
+  it("returns true when the binary responds to --version on linux", async () => {
+    setPlatform("linux");
+    __setGoLibrespotVersionProbe(async () => {});
+    expect(await checkGoLibrespotAvailable()).toBe(true);
+  });
+
+  it("caches only positive results and probes once", async () => {
+    setPlatform("linux");
+    const probe = vi.fn(async () => {});
+    __setGoLibrespotVersionProbe(probe);
+    expect(await checkGoLibrespotAvailable()).toBe(true);
+    expect(await checkGoLibrespotAvailable()).toBe(true);
+    expect(probe).toHaveBeenCalledTimes(1);
+  });
+
+  it("does not cache a failed probe (retries on the next call)", async () => {
+    setPlatform("linux");
+    __setGoLibrespotVersionProbe(async () => {
+      throw new Error("ENOENT");
+    });
+    expect(await checkGoLibrespotAvailable()).toBe(false);
+    // A later successful probe must now succeed — negatives are not cached.
+    __setGoLibrespotVersionProbe(async () => {});
+    expect(await checkGoLibrespotAvailable()).toBe(true);
+  });
+
+  it("resetGoLibrespotBinaryCache clears a cached positive", async () => {
+    setPlatform("linux");
+    __setGoLibrespotVersionProbe(async () => {});
+    expect(await checkGoLibrespotAvailable()).toBe(true);
+    resetGoLibrespotBinaryCache();
+    __setGoLibrespotVersionProbe(async () => {
+      throw new Error("gone");
+    });
+    expect(await checkGoLibrespotAvailable()).toBe(false);
+  });
+});
+
+describe("isRustLibrespotSupported", () => {
+  it("is true on every platform (pipe->stdout works everywhere)", () => {
+    setPlatform("linux");
+    expect(isRustLibrespotSupported()).toBe(true);
+    setPlatform("win32");
+    expect(isRustLibrespotSupported()).toBe(true);
+    setPlatform("darwin");
+    expect(isRustLibrespotSupported()).toBe(true);
+  });
+});
+
+describe("pickLibrespotPath (bin/ then PATH ordering, win32 exe)", () => {
+  it("prefers the bin/ path when the file exists", () => {
+    const binPath = join("some", "root", "bin", "librespot");
+    expect(
+      pickLibrespotPath([binPath, "librespot"], (p) => p === binPath),
+    ).toBe(binPath);
+  });
+
+  it("prefers the bin/librespot.exe path on win32 when it exists", () => {
+    setPlatform("win32");
+    const binExe = join("some", "root", "bin", "librespot.exe");
+    expect(
+      pickLibrespotPath([binExe, "librespot.exe"], (p) => p === binExe),
+    ).toBe(binExe);
+  });
+
+  it("falls through to the bare PATH name (librespot) on posix when bin/ is missing", () => {
+    setPlatform("linux");
+    const binPath = join("some", "root", "bin", "librespot");
+    expect(pickLibrespotPath([binPath, "librespot"], () => false)).toBe(
+      "librespot",
+    );
+  });
+
+  it("falls through to librespot.exe on win32 when bin/ is missing", () => {
+    setPlatform("win32");
+    const binExe = join("some", "root", "bin", "librespot.exe");
+    expect(pickLibrespotPath([binExe], () => false)).toBe("librespot.exe");
+  });
+
+  it("returns bare command names without touching the filesystem", () => {
+    const exists = vi.fn(() => false);
+    expect(pickLibrespotPath(["librespot"], exists)).toBe("librespot");
+    expect(exists).not.toHaveBeenCalled();
+  });
+});
+
+describe("findLibrespot", () => {
+  it("returns the bare command name when bin/librespot is absent", () => {
+    // No librespot binary is committed under bin/, so resolution must fall
+    // back to the bare PATH name (execFile resolves it at run time).
+    setPlatform("linux");
+    expect(findLibrespot()).toBe("librespot");
+  });
+
+  it("returns librespot.exe on win32 when bin/librespot.exe is absent", () => {
+    setPlatform("win32");
+    expect(findLibrespot()).toBe("librespot.exe");
+  });
+});
+
+describe("checkLibrespotAvailable", () => {
+  it("returns true when the binary responds to --version (any platform)", async () => {
+    setPlatform("win32");
+    __setLibrespotVersionProbe(async () => {});
+    expect(await checkLibrespotAvailable()).toBe(true);
+  });
+
+  it("returns true on darwin too (no platform gate)", async () => {
+    setPlatform("darwin");
+    __setLibrespotVersionProbe(async () => {});
+    expect(await checkLibrespotAvailable()).toBe(true);
+  });
+
+  it("caches only positive results and probes once", async () => {
+    setPlatform("linux");
+    const probe = vi.fn(async () => {});
+    __setLibrespotVersionProbe(probe);
+    expect(await checkLibrespotAvailable()).toBe(true);
+    expect(await checkLibrespotAvailable()).toBe(true);
+    expect(probe).toHaveBeenCalledTimes(1);
+  });
+
+  it("does not cache a failed probe (retries on the next call)", async () => {
+    setPlatform("win32");
+    __setLibrespotVersionProbe(async () => {
+      throw new Error("ENOENT");
+    });
+    expect(await checkLibrespotAvailable()).toBe(false);
+    __setLibrespotVersionProbe(async () => {});
+    expect(await checkLibrespotAvailable()).toBe(true);
+  });
+
+  it("resetLibrespotBinaryCache clears a cached positive", async () => {
+    setPlatform("linux");
+    __setLibrespotVersionProbe(async () => {});
+    expect(await checkLibrespotAvailable()).toBe(true);
+    resetLibrespotBinaryCache();
+    __setLibrespotVersionProbe(async () => {
+      throw new Error("gone");
+    });
+    expect(await checkLibrespotAvailable()).toBe(false);
+  });
+
+  it("de-dupes concurrent in-flight probes", async () => {
+    setPlatform("linux");
+    const probe = vi.fn(async () => {});
+    __setLibrespotVersionProbe(probe);
+    const [a, b] = await Promise.all([
+      checkLibrespotAvailable(),
+      checkLibrespotAvailable(),
+    ]);
+    expect(a).toBe(true);
+    expect(b).toBe(true);
+    expect(probe).toHaveBeenCalledTimes(1);
+  });
+});
+
+describe("resolveExecutable", () => {
+  it("returns a bin/-style path (contains a separator) that exists, unchanged", () => {
+    const dir = mkTmpDir("tsmb-resolve-");
+    const full = join(dir, "some-binary");
+    writeFileSync(full, "#!/bin/sh\n");
+    // The path contains a separator so it is checked directly, not via PATH.
+    expect(resolveExecutable(full)).toBe(full);
+  });
+
+  it("returns null for a bin/-style path that does not exist", () => {
+    const full = join(tmpdir(), "tsmb-resolve-missing", "nope-binary");
+    expect(resolveExecutable(full)).toBeNull();
+  });
+
+  it("resolves a BARE command name found in a PATH directory (the I3 fix)", () => {
+    // This is the regression the fix targets: a PATH-installed binary (bare
+    // name, no separator) must resolve against $PATH, not process.cwd().
+    const dir = mkTmpDir("tsmb-resolve-path-");
+    const exeName = process.platform === "win32" ? "faketool.exe" : "faketool";
+    const full = join(dir, exeName);
+    writeFileSync(full, "#!/bin/sh\n");
+    process.env.PATH = dir;
+    expect(resolveExecutable(exeName)).toBe(full);
+  });
+
+  it("returns null for a bare name not present in any PATH directory", () => {
+    process.env.PATH = mkTmpDir("tsmb-resolve-empty-");
+    expect(resolveExecutable("definitely-not-a-real-binary-xyz")).toBeNull();
+  });
+
+  it("appends PATHEXT extensions on win32 to resolve a bare (extensionless) name", () => {
+    setPlatform("win32");
+    const dir = mkTmpDir("tsmb-resolve-pathext-");
+    const full = join(dir, "mytool.CMD");
+    writeFileSync(full, "@echo hi\n");
+    process.env.PATH = dir;
+    process.env.PATHEXT = ".EXE;.CMD;.BAT;.COM";
+    // Bare "mytool" has no extension; win32 resolution must try PATHEXT and
+    // find mytool.CMD.
+    expect(resolveExecutable("mytool")).toBe(full);
+  });
+
+  it("does not touch PATH for a bin/-style relative path with a separator", () => {
+    // A candidate with a separator is checked directly even if PATH is empty.
+    process.env.PATH = "";
+    const dir = mkTmpDir("tsmb-resolve-direct-");
+    const full = join(dir, "direct-binary");
+    writeFileSync(full, "#!/bin/sh\n");
+    expect(resolveExecutable(full)).toBe(full);
+  });
+});
+
+describe("isLibrespotPresent (PATH-aware, sync)", () => {
+  it("true when the bare librespot name resolves on PATH (posix)", () => {
+    setPlatform("linux");
+    const dir = mkTmpDir("tsmb-librespot-path-");
+    writeFileSync(join(dir, "librespot"), "#!/bin/sh\n");
+    process.env.PATH = dir;
+    expect(isLibrespotPresent()).toBe(true);
+  });
+
+  it("true when librespot.exe resolves on PATH (win32)", () => {
+    setPlatform("win32");
+    const dir = mkTmpDir("tsmb-librespot-win-");
+    writeFileSync(join(dir, "librespot.exe"), "MZ\n");
+    process.env.PATH = dir;
+    process.env.PATHEXT = ".EXE;.CMD;.BAT;.COM";
+    expect(isLibrespotPresent()).toBe(true);
+  });
+
+  it("false when librespot is not on PATH", () => {
+    setPlatform("linux");
+    process.env.PATH = mkTmpDir("tsmb-librespot-empty-");
+    expect(isLibrespotPresent()).toBe(false);
+  });
+});
+
+describe("isGoLibrespotPresent (PATH-aware, sync)", () => {
+  it("true when go-librespot resolves on PATH (linux)", () => {
+    setPlatform("linux");
+    const dir = mkTmpDir("tsmb-go-path-");
+    writeFileSync(join(dir, "go-librespot"), "#!/bin/sh\n");
+    process.env.PATH = dir;
+    expect(isGoLibrespotPresent()).toBe(true);
+  });
+
+  it("false on non-linux platforms regardless of PATH (unsupported gate)", () => {
+    setPlatform("win32");
+    const dir = mkTmpDir("tsmb-go-win-");
+    writeFileSync(join(dir, "go-librespot"), "#!/bin/sh\n");
+    process.env.PATH = dir;
+    expect(isGoLibrespotPresent()).toBe(false);
+  });
+
+  it("false on linux when go-librespot is not on PATH", () => {
+    setPlatform("linux");
+    process.env.PATH = mkTmpDir("tsmb-go-empty-");
+    expect(isGoLibrespotPresent()).toBe(false);
+  });
+});

src/music/spotify/binary.ts

@@ -0,0 +1,244 @@
+import { execFile } from "node:child_process";
+import { promisify } from "node:util";
+import { existsSync } from "node:fs";
+import { fileURLToPath } from "node:url";
+import { dirname, join, delimiter } from "node:path";
+
+const execFileAsync = promisify(execFile);
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+
+/**
+ * Resolve a command to an existing absolute path, SYNCHRONOUSLY. A candidate
+ * that already contains a path separator (a project bin/ path) is checked
+ * directly; a BARE command name (e.g. "librespot" / "go-librespot") is searched
+ * across the $PATH directories — with PATHEXT extensions appended on win32 — so
+ * a scoop/choco/cargo/apt PATH install resolves. Returns the resolved path, or
+ * null when nothing exists.
+ *
+ * This is the sync counterpart to checkLibrespotAvailable()/…GoLibrespot… and
+ * is what the hot-path presence gates (chooseBackend/isAvailable) rely on: a
+ * bare name must NOT be handed to existsSync() directly, since existsSync
+ * resolves it against process.cwd() rather than PATH (Bug I3/m1).
+ */
+export function resolveExecutable(cmd: string): string | null {
+  if (cmd.includes("/") || cmd.includes("\\")) {
+    return existsSync(cmd) ? cmd : null;
+  }
+  const dirs = (process.env.PATH || "").split(delimiter).filter(Boolean);
+  const exts =
+    process.platform === "win32"
+      ? (process.env.PATHEXT || ".EXE;.CMD;.BAT;.COM").split(";").filter(Boolean)
+      : [""];
+  for (const dir of dirs) {
+    for (const ext of exts) {
+      const hasExt = ext && cmd.toLowerCase().endsWith(ext.toLowerCase());
+      const full = join(dir, hasExt ? cmd : cmd + ext);
+      if (existsSync(full)) return full;
+    }
+  }
+  return null;
+}
+
+/**
+ * True only on Linux. go-librespot ships Linux-only release binaries and the
+ * sidecar relies on a POSIX FIFO (mkfifo), so the Spotify audio backend is
+ * gated to Linux/Docker. Everywhere else the caller falls back to the Stage-1
+ * sentinel-skip message.
+ */
+export function isGoLibrespotSupported(): boolean {
+  return process.platform === "linux";
+}
+
+/**
+ * Pure resolver core behind findGoLibrespot(). Returns the first candidate
+ * that is either a bare command name (left for execFile to resolve via PATH)
+ * or an existing bin/ file. Exported so tests can inject candidates + a fake
+ * existence predicate and need no real binary on disk.
+ */
+export function pickGoLibrespotPath(
+  candidates: string[],
+  exists: (p: string) => boolean,
+): string {
+  for (const c of candidates) {
+    // bin/ paths only count when the file is actually present; bare names are
+    // returned unconditionally and resolved later via PATH.
+    const isBinPath = c.includes(join("bin", "go-librespot"));
+    if (!isBinPath || exists(c)) return c;
+  }
+  return "go-librespot";
+}
+
+/** Resolve the go-librespot binary path: project bin/ dir first, then PATH. */
+export function findGoLibrespot(): string {
+  // src/music/spotify -> ../../../bin (one level deeper than youtube.ts).
+  const binPath = join(__dirname, "..", "..", "..", "bin", "go-librespot");
+  return pickGoLibrespotPath([binPath, "go-librespot"], existsSync);
+}
+
+/**
+ * SYNCHRONOUS presence gate for go-librespot: supported platform (linux) AND
+ * the resolved binary (project bin/ OR a PATH install) actually exists. This is
+ * what chooseBackend()/isAvailable() must use — NOT existsSync(findGoLibrespot())
+ * which cannot see a bare PATH name (Bug I3/m1).
+ */
+export function isGoLibrespotPresent(): boolean {
+  return isGoLibrespotSupported() && resolveExecutable(findGoLibrespot()) !== null;
+}
+
+// Injectable `--version` probe. Defaults to the real execFile call; tests
+// override it so checkGoLibrespotAvailable() needs no real binary. Keeps the
+// public checkGoLibrespotAvailable() signature param-free per the contract.
+type VersionProbe = (bin: string) => Promise<void>;
+const realProbe: VersionProbe = async (bin) => {
+  await execFileAsync(bin, ["--version"], { timeout: 5_000, maxBuffer: 1024 });
+};
+let versionProbe: VersionProbe = realProbe;
+
+/** Test hook: override the `--version` probe, or restore the default with null. */
+export function __setGoLibrespotVersionProbe(
+  probe: VersionProbe | null,
+): void {
+  versionProbe = probe ?? realProbe;
+}
+
+/**
+ * Availability check for go-librespot. Returns false immediately on non-Linux
+ * platforms (unsupported). Otherwise runs `go-librespot --version` (5s timeout)
+ * and caches ONLY the positive result — a missing binary is retried on the
+ * next call so the operator can install it without restarting the server.
+ */
+let cachedAvailable = false;
+let pendingCheck: Promise<boolean> | null = null;
+export async function checkGoLibrespotAvailable(): Promise<boolean> {
+  if (!isGoLibrespotSupported()) return false;
+  if (cachedAvailable) return true;
+  if (pendingCheck) return pendingCheck;
+  pendingCheck = (async () => {
+    try {
+      await versionProbe(findGoLibrespot());
+      cachedAvailable = true;
+      return true;
+    } catch {
+      return false;
+    } finally {
+      pendingCheck = null;
+    }
+  })();
+  return pendingCheck;
+}
+
+/** Force re-detection on the next call (for tests). */
+export function resetGoLibrespotBinaryCache(): void {
+  cachedAvailable = false;
+  pendingCheck = null;
+}
+
+// ---------------------------------------------------------------------------
+// Rust librespot (librespot-org) resolver — mirrors the go-librespot fns
+// above. Unlike go-librespot, Rust librespot's `--backend pipe` writes PCM to
+// *stdout* on every platform (no FIFO, no audio device), so it is supported
+// on Windows/macOS/Linux alike and the binary is named librespot.exe on win32.
+// ---------------------------------------------------------------------------
+
+/**
+ * True on ALL platforms. The Rust librespot pipe backend writes raw bytes to
+ * process stdout, which Node's spawned child.stdout receives unmodified on
+ * Windows too — so there is no platform gate here (contrast
+ * isGoLibrespotSupported, which is Linux-only).
+ */
+export function isRustLibrespotSupported(): boolean {
+  return true;
+}
+
+/**
+ * Pure resolver core behind findLibrespot(). Returns the first candidate that
+ * is either a bare command name (left for execFile to resolve via PATH) or an
+ * existing bin/ file. Exported so tests can inject candidates + a fake
+ * existence predicate and need no real binary on disk. Mirrors
+ * pickGoLibrespotPath but keys off the win32 exe name.
+ */
+export function pickLibrespotPath(
+  candidates: string[],
+  exists: (p: string) => boolean,
+): string {
+  const exe = process.platform === "win32" ? "librespot.exe" : "librespot";
+  for (const c of candidates) {
+    // bin/ paths only count when the file is actually present; bare names are
+    // returned unconditionally and resolved later via PATH.
+    const isBinPath = c.includes(join("bin", "librespot"));
+    if (!isBinPath || exists(c)) return c;
+  }
+  return exe;
+}
+
+/**
+ * Resolve the Rust librespot binary path: project bin/ dir first, then PATH.
+ * On win32 both the bin/librespot.exe candidate and the bare "librespot.exe"
+ * fallback are used so a PATH-installed librespot.exe (scoop/choco) resolves.
+ */
+export function findLibrespot(): string {
+  const exe = process.platform === "win32" ? "librespot.exe" : "librespot";
+  // src/music/spotify -> ../../../bin (same depth as findGoLibrespot).
+  const binExe = join(__dirname, "..", "..", "..", "bin", exe);
+  const binBare = join(__dirname, "..", "..", "..", "bin", "librespot");
+  return pickLibrespotPath([binExe, binBare, exe], existsSync);
+}
+
+/**
+ * SYNCHRONOUS presence gate for Rust librespot: supported everywhere AND the
+ * resolved binary (project bin/ OR a scoop/choco/cargo PATH install) actually
+ * exists. This is what chooseBackend()/isAvailable() must use — NOT
+ * existsSync(findLibrespot()) which cannot see a bare PATH name (Bug I3/m1).
+ */
+export function isLibrespotPresent(): boolean {
+  return isRustLibrespotSupported() && resolveExecutable(findLibrespot()) !== null;
+}
+
+// Injectable `--version` probe. Defaults to the real execFile call; tests
+// override it so checkLibrespotAvailable() needs no real binary. Keeps the
+// public checkLibrespotAvailable() signature param-free per the contract.
+type LibrespotVersionProbe = (bin: string) => Promise<void>;
+const realLibrespotProbe: LibrespotVersionProbe = async (bin) => {
+  await execFileAsync(bin, ["--version"], { timeout: 5_000, maxBuffer: 1024 });
+};
+let librespotVersionProbe: LibrespotVersionProbe = realLibrespotProbe;
+
+/** Test hook: override the `--version` probe, or restore the default with null. */
+export function __setLibrespotVersionProbe(
+  probe: LibrespotVersionProbe | null,
+): void {
+  librespotVersionProbe = probe ?? realLibrespotProbe;
+}
+
+/**
+ * Availability check for Rust librespot. No platform gate (supported
+ * everywhere). Runs `librespot --version` (5s timeout) and caches ONLY the
+ * positive result — a missing binary is retried on the next call so the
+ * operator can install it (cargo/scoop/choco) without restarting the server.
+ */
+let rustCachedAvailable = false;
+let rustPendingCheck: Promise<boolean> | null = null;
+export async function checkLibrespotAvailable(): Promise<boolean> {
+  if (!isRustLibrespotSupported()) return false;
+  if (rustCachedAvailable) return true;
+  if (rustPendingCheck) return rustPendingCheck;
+  rustPendingCheck = (async () => {
+    try {
+      await librespotVersionProbe(findLibrespot());
+      rustCachedAvailable = true;
+      return true;
+    } catch {
+      return false;
+    } finally {
+      rustPendingCheck = null;
+    }
+  })();
+  return rustPendingCheck;
+}
+
+/** Force re-detection on the next call (for tests). */
+export function resetLibrespotBinaryCache(): void {
+  rustCachedAvailable = false;
+  rustPendingCheck = null;
+}

src/music/spotify/connect-api.test.ts

@@ -0,0 +1,396 @@
+import { describe, it, expect, vi } from "vitest";
+import type { AxiosInstance } from "axios";
+import { SpotifyConnectApi } from "./connect-api.js";
+
+/** Minimal axios stub: only get/put are exercised by the Connect client. */
+function makeHttp(overrides?: Partial<Record<"get" | "put", any>>) {
+  return {
+    get: vi.fn().mockResolvedValue({ status: 200, data: {} }),
+    put: vi.fn().mockResolvedValue({ status: 200, data: {} }),
+    ...overrides,
+  } as unknown as AxiosInstance;
+}
+
+const AUTH = { headers: { Authorization: "Bearer tok123" } };
+const token = () =>
+  vi.fn<() => Promise<string | null>>().mockResolvedValue("tok123");
+
+describe("SpotifyConnectApi.getDevices", () => {
+  it("GETs /v1/me/player/devices with the bearer header and maps the list", async () => {
+    const http = makeHttp({
+      get: vi.fn().mockResolvedValue({
+        status: 200,
+        data: {
+          devices: [
+            { id: "dev-1", name: "TS Bot", is_active: true, type: "Speaker" },
+            { id: "dev-2", name: "Phone", is_active: false },
+          ],
+        },
+      }),
+    });
+    const api = new SpotifyConnectApi(token(), { http });
+    const devices = await api.getDevices();
+    expect(http.get).toHaveBeenCalledWith("/v1/me/player/devices", AUTH);
+    expect(devices).toEqual([
+      { id: "dev-1", name: "TS Bot", is_active: true },
+      { id: "dev-2", name: "Phone", is_active: false },
+    ]);
+  });
+
+  it("returns [] when getToken() is null (unauthorized) without calling http", async () => {
+    const http = makeHttp();
+    const api = new SpotifyConnectApi(vi.fn().mockResolvedValue(null), { http });
+    await expect(api.getDevices()).resolves.toEqual([]);
+    expect(http.get).not.toHaveBeenCalled();
+  });
+
+  it("returns [] on a 401/network rejection (graceful)", async () => {
+    const err: any = new Error("unauthorized");
+    err.response = { status: 401 };
+    const http = makeHttp({ get: vi.fn().mockRejectedValue(err) });
+    const api = new SpotifyConnectApi(token(), { http });
+    await expect(api.getDevices()).resolves.toEqual([]);
+  });
+});
+
+describe("SpotifyConnectApi.findDeviceByName", () => {
+  it("returns the matching device id", async () => {
+    const http = makeHttp({
+      get: vi.fn().mockResolvedValue({
+        status: 200,
+        data: { devices: [{ id: "dev-1", name: "TS Bot", is_active: false }] },
+      }),
+    });
+    const api = new SpotifyConnectApi(token(), { http });
+    await expect(api.findDeviceByName("TS Bot")).resolves.toBe("dev-1");
+  });
+
+  it("returns null when no device name matches", async () => {
+    const http = makeHttp({
+      get: vi.fn().mockResolvedValue({
+        status: 200,
+        data: { devices: [{ id: "dev-1", name: "Other", is_active: false }] },
+      }),
+    });
+    const api = new SpotifyConnectApi(token(), { http });
+    await expect(api.findDeviceByName("TS Bot")).resolves.toBeNull();
+  });
+});
+
+describe("SpotifyConnectApi mutating calls", () => {
+  it("transfer() PUTs /v1/me/player with device_ids + play=false default", async () => {
+    const http = makeHttp();
+    const api = new SpotifyConnectApi(token(), { http });
+    await api.transfer("dev-1");
+    expect(http.put).toHaveBeenCalledWith(
+      "/v1/me/player",
+      { device_ids: ["dev-1"], play: false },
+      AUTH,
+    );
+  });
+
+  it("transfer(id, true) forwards play=true", async () => {
+    const http = makeHttp();
+    const api = new SpotifyConnectApi(token(), { http });
+    await api.transfer("dev-1", true);
+    expect(http.put).toHaveBeenCalledWith(
+      "/v1/me/player",
+      { device_ids: ["dev-1"], play: true },
+      AUTH,
+    );
+  });
+
+  it("play() PUTs /v1/me/player/play?device_id= with the uris body", async () => {
+    const http = makeHttp();
+    const api = new SpotifyConnectApi(token(), { http });
+    await api.play("dev-1", "spotify:track:abc");
+    expect(http.put).toHaveBeenCalledWith(
+      "/v1/me/player/play",
+      { uris: ["spotify:track:abc"] },
+      { headers: { Authorization: "Bearer tok123" }, params: { device_id: "dev-1" } },
+    );
+  });
+
+  it("pause() PUTs /v1/me/player/pause (no params) with no body", async () => {
+    const http = makeHttp();
+    const api = new SpotifyConnectApi(token(), { http });
+    await api.pause();
+    expect(http.put).toHaveBeenCalledWith("/v1/me/player/pause", undefined, {
+      headers: { Authorization: "Bearer tok123" },
+      params: undefined,
+    });
+  });
+
+  it("pause(id) forwards device_id param", async () => {
+    const http = makeHttp();
+    const api = new SpotifyConnectApi(token(), { http });
+    await api.pause("dev-1");
+    expect(http.put).toHaveBeenCalledWith("/v1/me/player/pause", undefined, {
+      headers: { Authorization: "Bearer tok123" },
+      params: { device_id: "dev-1" },
+    });
+  });
+
+  it("resume() PUTs /v1/me/player/play with no uris body (resume)", async () => {
+    const http = makeHttp();
+    const api = new SpotifyConnectApi(token(), { http });
+    await api.resume();
+    expect(http.put).toHaveBeenCalledWith("/v1/me/player/play", undefined, {
+      headers: { Authorization: "Bearer tok123" },
+      params: undefined,
+    });
+  });
+
+  it("resume(id) forwards device_id param", async () => {
+    const http = makeHttp();
+    const api = new SpotifyConnectApi(token(), { http });
+    await api.resume("dev-1");
+    expect(http.put).toHaveBeenCalledWith("/v1/me/player/play", undefined, {
+      headers: { Authorization: "Bearer tok123" },
+      params: { device_id: "dev-1" },
+    });
+  });
+
+  it("seek() PUTs /v1/me/player/seek?position_ms=", async () => {
+    const http = makeHttp();
+    const api = new SpotifyConnectApi(token(), { http });
+    await api.seek(42000);
+    expect(http.put).toHaveBeenCalledWith("/v1/me/player/seek", undefined, {
+      headers: { Authorization: "Bearer tok123" },
+      params: { position_ms: 42000 },
+    });
+  });
+
+  it("seek(ms, id) adds device_id param", async () => {
+    const http = makeHttp();
+    const api = new SpotifyConnectApi(token(), { http });
+    await api.seek(1000, "dev-1");
+    expect(http.put).toHaveBeenCalledWith("/v1/me/player/seek", undefined, {
+      headers: { Authorization: "Bearer tok123" },
+      params: { position_ms: 1000, device_id: "dev-1" },
+    });
+  });
+
+  it("mutating calls no-op (no http.put) when unauthorized", async () => {
+    const http = makeHttp();
+    const api = new SpotifyConnectApi(vi.fn().mockResolvedValue(null), { http });
+    await api.transfer("dev-1");
+    await api.play("dev-1", "spotify:track:x");
+    await api.pause();
+    expect(http.put).not.toHaveBeenCalled();
+  });
+});
+
+/**
+ * REQUIRED CORRECTION C3.6: mutating calls must NOT reject up the queue-advance
+ * path. A transient 403 (non-Premium) / 404 (no active device) / 429
+ * (rate-limited) from Spotify must be swallowed (resolve to void), never thrown,
+ * so a failed play() degrades to "couldn't play" instead of an unhandled
+ * rejection that crashes the backend.
+ */
+describe("SpotifyConnectApi C3.6 — mutating calls are resilient (no throw)", () => {
+  // S4.6: transient statuses (404/429) now retry with backoff; inject a no-op
+  // sleep so these swallow-guarantee tests stay instant (no real timers). The
+  // no-throw/swallow contract asserted here is unchanged.
+  const noSleep = async () => {};
+
+  function rejectingHttp(status: number) {
+    const err: any = new Error(`http ${status}`);
+    err.response = { status };
+    return makeHttp({ put: vi.fn().mockRejectedValue(err) });
+  }
+
+  it("play() does NOT throw on a 404 (no active device)", async () => {
+    const api = new SpotifyConnectApi(token(), {
+      http: rejectingHttp(404),
+      sleep: noSleep,
+    });
+    await expect(api.play("dev-1", "spotify:track:abc")).resolves.toBeUndefined();
+  });
+
+  it("play() does NOT throw on a 429 (rate-limited)", async () => {
+    const api = new SpotifyConnectApi(token(), {
+      http: rejectingHttp(429),
+      sleep: noSleep,
+    });
+    await expect(api.play("dev-1", "spotify:track:abc")).resolves.toBeUndefined();
+  });
+
+  it("transfer() does NOT throw on a 403 (non-Premium)", async () => {
+    const api = new SpotifyConnectApi(token(), { http: rejectingHttp(403) });
+    await expect(api.transfer("dev-1", true)).resolves.toBeUndefined();
+  });
+
+  it("pause/resume/seek do NOT throw on a rejection", async () => {
+    const api = new SpotifyConnectApi(token(), {
+      http: rejectingHttp(404),
+      sleep: noSleep,
+    });
+    await expect(api.pause("dev-1")).resolves.toBeUndefined();
+    await expect(api.resume("dev-1")).resolves.toBeUndefined();
+    await expect(api.seek(1000, "dev-1")).resolves.toBeUndefined();
+  });
+
+  it("play() does NOT throw on a raw network error (no response)", async () => {
+    const http = makeHttp({ put: vi.fn().mockRejectedValue(new Error("ECONNRESET")) });
+    const api = new SpotifyConnectApi(token(), { http });
+    await expect(api.play("dev-1", "spotify:track:abc")).resolves.toBeUndefined();
+  });
+});
+
+/**
+ * Task S4.6: bounded retry/backoff on the mutating Connect commands
+ * (spec §4.3/§13 recovery/watchdog). Transient statuses {404,429,500,502,503}
+ * retry up to MAX_ATTEMPTS (3) with exponential backoff; non-transient statuses
+ * are NOT retried. Every path still preserves C3.6 (swallow, never throw). A
+ * no-op injected `sleep` keeps the tests instant (no real timers).
+ */
+describe("SpotifyConnectApi S4.6 — retry/backoff on mutating commands", () => {
+  const MAX_ATTEMPTS = 3;
+  const noSleep = async () => {};
+
+  function rejectStatus(status: number, headers?: Record<string, string>) {
+    const err: any = new Error(`http ${status}`);
+    err.response = { status, headers };
+    return err;
+  }
+
+  it("play() retries a transient 404 then succeeds (2 calls, no throw)", async () => {
+    const put = vi
+      .fn()
+      .mockRejectedValueOnce(rejectStatus(404))
+      .mockResolvedValueOnce({ status: 200, data: {} });
+    const http = makeHttp({ put });
+    const api = new SpotifyConnectApi(token(), { http, sleep: noSleep });
+    await expect(api.play("dev-1", "spotify:track:abc")).resolves.toBeUndefined();
+    expect(put).toHaveBeenCalledTimes(2);
+  });
+
+  it("play() exhausts on a persistent 500 (MAX_ATTEMPTS calls, swallowed, warns once)", async () => {
+    const put = vi.fn().mockRejectedValue(rejectStatus(500));
+    const http = makeHttp({ put });
+    const warn = vi.fn();
+    const logger = { warn } as any;
+    const api = new SpotifyConnectApi(token(), { http, sleep: noSleep, logger });
+    await expect(api.play("dev-1", "spotify:track:abc")).resolves.toBeUndefined();
+    expect(put).toHaveBeenCalledTimes(MAX_ATTEMPTS);
+    expect(warn).toHaveBeenCalledTimes(1);
+  });
+
+  it("does NOT retry a non-transient 403 (exactly ONE call, no throw)", async () => {
+    const put = vi.fn().mockRejectedValue(rejectStatus(403));
+    const http = makeHttp({ put });
+    const api = new SpotifyConnectApi(token(), { http, sleep: noSleep });
+    await expect(api.play("dev-1", "spotify:track:abc")).resolves.toBeUndefined();
+    expect(put).toHaveBeenCalledTimes(1);
+  });
+
+  it("429 honors a CAPPED Retry-After then succeeds (2 calls, bounded sleep)", async () => {
+    const put = vi
+      .fn()
+      .mockRejectedValueOnce(rejectStatus(429, { "retry-after": "1" }))
+      .mockResolvedValueOnce({ status: 200, data: {} });
+    const http = makeHttp({ put });
+    const sleep = vi.fn<(ms: number) => Promise<void>>(async () => {});
+    const api = new SpotifyConnectApi(token(), { http, sleep });
+    await expect(api.play("dev-1", "spotify:track:abc")).resolves.toBeUndefined();
+    expect(put).toHaveBeenCalledTimes(2);
+    expect(sleep).toHaveBeenCalledTimes(1);
+    const delay = sleep.mock.calls[0][0];
+    expect(delay).toBe(1000);
+    expect(delay).toBeLessThanOrEqual(2000);
+  });
+
+  it("transfer() shares the retry path — 404 then success (2 calls)", async () => {
+    const put = vi
+      .fn()
+      .mockRejectedValueOnce(rejectStatus(404))
+      .mockResolvedValueOnce({ status: 200, data: {} });
+    const http = makeHttp({ put });
+    const api = new SpotifyConnectApi(token(), { http, sleep: noSleep });
+    await expect(api.transfer("dev-1", true)).resolves.toBeUndefined();
+    expect(put).toHaveBeenCalledTimes(2);
+  });
+});
+
+describe("SpotifyConnectApi.getPlaybackState", () => {
+  it("GETs /v1/me/player and maps is_playing/progress/item", async () => {
+    const http = makeHttp({
+      get: vi.fn().mockResolvedValue({
+        status: 200,
+        data: {
+          is_playing: true,
+          progress_ms: 12345,
+          item: { uri: "spotify:track:abc", duration_ms: 200000 },
+        },
+      }),
+    });
+    const api = new SpotifyConnectApi(token(), { http });
+    const state = await api.getPlaybackState();
+    expect(http.get).toHaveBeenCalledWith("/v1/me/player", AUTH);
+    expect(state).toEqual({
+      isPlaying: true,
+      progressMs: 12345,
+      trackUri: "spotify:track:abc",
+      durationMs: 200000,
+    });
+  });
+
+  // R4-4 (multi-bot): the account-wide /v1/me/player response names the single
+  // ACTIVE Connect device. Expose it as activeDeviceId so the Rust backend can
+  // tell "our device" from a foreign device another bot stole the session with.
+  it("maps device.id -> activeDeviceId", async () => {
+    const http = makeHttp({
+      get: vi.fn().mockResolvedValue({
+        status: 200,
+        data: {
+          is_playing: true,
+          progress_ms: 1000,
+          item: { uri: "spotify:track:abc", duration_ms: 200000 },
+          device: { id: "dev-1", name: "TS Bot", is_active: true },
+        },
+      }),
+    });
+    const api = new SpotifyConnectApi(token(), { http });
+    const state = await api.getPlaybackState();
+    expect(state).toEqual({
+      isPlaying: true,
+      progressMs: 1000,
+      trackUri: "spotify:track:abc",
+      durationMs: 200000,
+      activeDeviceId: "dev-1",
+    });
+  });
+
+  it("returns null on 204 (no active device)", async () => {
+    const http = makeHttp({ get: vi.fn().mockResolvedValue({ status: 204, data: "" }) });
+    const api = new SpotifyConnectApi(token(), { http });
+    await expect(api.getPlaybackState()).resolves.toBeNull();
+  });
+
+  it("returns null when item is missing / trackUri null", async () => {
+    const http = makeHttp({
+      get: vi.fn().mockResolvedValue({ status: 200, data: { is_playing: false, progress_ms: 0, item: null } }),
+    });
+    const api = new SpotifyConnectApi(token(), { http });
+    await expect(api.getPlaybackState()).resolves.toEqual({
+      isPlaying: false,
+      progressMs: 0,
+      trackUri: null,
+      durationMs: 0,
+    });
+  });
+
+  it("returns null on rejection (e.g. 401) instead of throwing", async () => {
+    const http = makeHttp({ get: vi.fn().mockRejectedValue(new Error("boom")) });
+    const api = new SpotifyConnectApi(token(), { http });
+    await expect(api.getPlaybackState()).resolves.toBeNull();
+  });
+
+  it("returns null when getToken() is null (unauthorized) without calling http", async () => {
+    const http = makeHttp();
+    const api = new SpotifyConnectApi(vi.fn().mockResolvedValue(null), { http });
+    await expect(api.getPlaybackState()).resolves.toBeNull();
+    expect(http.get).not.toHaveBeenCalled();
+  });
+});

src/music/spotify/connect-api.ts

@@ -0,0 +1,205 @@
+import axios, { type AxiosInstance } from "axios";
+
+const API_BASE = "https://api.spotify.com";
+
+/**
+ * Task S4.6 (spec §4.3/§13 recovery/watchdog): transient Connect-command
+ * failures that warrant a bounded retry with exponential backoff. 404 is the
+ * device-visibility latency case (device not yet enumerated), 429 is rate-limit,
+ * 5xx are Spotify-side flakiness. Everything else (401/403/network) is NOT
+ * retried — it is swallowed immediately (C3.6).
+ */
+const TRANSIENT = new Set([404, 429, 500, 502, 503]);
+const MAX_ATTEMPTS = 3;
+const BASE_DELAY_MS = 150;
+const MAX_DELAY_MS = 2_000;
+
+export interface SpotifyDevice {
+  id: string;
+  name: string;
+  is_active: boolean;
+}
+
+export interface PlaybackState {
+  isPlaying: boolean;
+  progressMs: number;
+  trackUri: string | null;
+  durationMs: number;
+  /**
+   * R4-4 (multi-bot): the id of the single ACTIVE Connect device the
+   * account-wide GET /v1/me/player is reporting (from `device.id`). Absent when
+   * Spotify omits the device block. The Rust backend uses it to tell "our
+   * device" from a foreign device another bot stole the shared session with, so
+   * it never misattributes that bot's track/stop as ours.
+   */
+  activeDeviceId?: string;
+}
+
+/**
+ * Spotify Web API "Connect" remote-control client. Wraps an axios instance and
+ * attaches a live user Bearer token from getToken() to every request.
+ *
+ * Error policy:
+ * - Read-only calls (getDevices/getPlaybackState) degrade to []/null on error.
+ * - Mutating calls (transfer/play/pause/resume/seek) no-op when unauthorized.
+ * - REQUIRED CORRECTION C3.6: mutating calls ALSO swallow transport errors
+ *   (403 non-Premium / 404 no active device / 429 rate-limited / network) and
+ *   resolve to void instead of rejecting. The contract keeps the Promise<void>
+ *   signatures, so the backend treats a failed play as "couldn't play" and
+ *   falls back — a transient Spotify error can never surface as an unhandled
+ *   rejection that crashes the queue-advance path.
+ */
+export class SpotifyConnectApi {
+  private getToken: () => Promise<string | null>;
+  private http: AxiosInstance;
+  private sleep: (ms: number) => Promise<void>;
+  private logger?: import("pino").Logger;
+
+  constructor(
+    getToken: () => Promise<string | null>,
+    deps?: {
+      http?: AxiosInstance;
+      sleep?: (ms: number) => Promise<void>;
+      logger?: import("pino").Logger;
+    },
+  ) {
+    this.getToken = getToken;
+    this.http = deps?.http ?? axios.create({ baseURL: API_BASE, timeout: 15_000 });
+    this.sleep = deps?.sleep ?? ((ms) => new Promise((r) => setTimeout(r, ms)));
+    this.logger = deps?.logger;
+  }
+
+  /** Bearer auth headers, or null when no valid user token is available. */
+  private async authHeaders(): Promise<{ Authorization: string } | null> {
+    const token = await this.getToken();
+    if (!token) return null;
+    return { Authorization: `Bearer ${token}` };
+  }
+
+  /**
+   * S4.6 recovery/watchdog: run a mutating PUT with bounded retry + exponential
+   * backoff on TRANSIENT statuses only. On exhaustion OR a non-transient error
+   * it SWALLOWS and warns once — preserving C3.6 (a mutating command NEVER
+   * rejects up the queue-advance path). Tokens are never logged.
+   */
+  private async mutateWithRetry(put: () => Promise<unknown>): Promise<void> {
+    for (let attempt = 1; attempt <= MAX_ATTEMPTS; attempt++) {
+      try {
+        await put();
+        return;
+      } catch (err: any) {
+        const status = err?.response?.status;
+        if (!TRANSIENT.has(status) || attempt === MAX_ATTEMPTS) {
+          // C3.6: never reject up the queue path — swallow, but surface once.
+          this.logger?.warn(
+            { status },
+            "Spotify Connect command failed (exhausted/non-retryable)",
+          );
+          return;
+        }
+        let delay = Math.min(BASE_DELAY_MS * 2 ** (attempt - 1), MAX_DELAY_MS);
+        if (status === 429) {
+          const ra = Number(err?.response?.headers?.["retry-after"]);
+          if (Number.isFinite(ra) && ra > 0) delay = Math.min(ra * 1000, MAX_DELAY_MS);
+        }
+        await this.sleep(delay);
+      }
+    }
+  }
+
+  async getDevices(): Promise<SpotifyDevice[]> {
+    const headers = await this.authHeaders();
+    if (!headers) return [];
+    try {
+      const { data } = await this.http.get("/v1/me/player/devices", { headers });
+      const list = Array.isArray(data?.devices) ? data.devices : [];
+      return list.map((d: any) => ({
+        id: d?.id ?? "",
+        name: d?.name ?? "",
+        is_active: Boolean(d?.is_active),
+      }));
+    } catch {
+      return [];
+    }
+  }
+
+  async findDeviceByName(name: string): Promise<string | null> {
+    const devices = await this.getDevices();
+    const match = devices.find((d) => d.name === name);
+    return match ? match.id : null;
+  }
+
+  async transfer(deviceId: string, play = false): Promise<void> {
+    const headers = await this.authHeaders();
+    if (!headers) return;
+    await this.mutateWithRetry(() =>
+      this.http.put("/v1/me/player", { device_ids: [deviceId], play }, { headers }),
+    );
+  }
+
+  async play(deviceId: string, trackUri: string): Promise<void> {
+    const headers = await this.authHeaders();
+    if (!headers) return;
+    await this.mutateWithRetry(() =>
+      this.http.put(
+        "/v1/me/player/play",
+        { uris: [trackUri] },
+        { headers, params: { device_id: deviceId } },
+      ),
+    );
+  }
+
+  async pause(deviceId?: string): Promise<void> {
+    const headers = await this.authHeaders();
+    if (!headers) return;
+    await this.mutateWithRetry(() =>
+      this.http.put("/v1/me/player/pause", undefined, {
+        headers,
+        params: deviceId ? { device_id: deviceId } : undefined,
+      }),
+    );
+  }
+
+  async resume(deviceId?: string): Promise<void> {
+    const headers = await this.authHeaders();
+    if (!headers) return;
+    await this.mutateWithRetry(() =>
+      this.http.put("/v1/me/player/play", undefined, {
+        headers,
+        params: deviceId ? { device_id: deviceId } : undefined,
+      }),
+    );
+  }
+
+  async seek(ms: number, deviceId?: string): Promise<void> {
+    const headers = await this.authHeaders();
+    if (!headers) return;
+    const params: Record<string, unknown> = { position_ms: ms };
+    if (deviceId) params.device_id = deviceId;
+    await this.mutateWithRetry(() =>
+      this.http.put("/v1/me/player/seek", undefined, { headers, params }),
+    );
+  }
+
+  async getPlaybackState(): Promise<PlaybackState | null> {
+    const headers = await this.authHeaders();
+    if (!headers) return null;
+    try {
+      const res = await this.http.get("/v1/me/player", { headers });
+      // 204 = no active device / playback; body is empty.
+      if (res.status === 204 || !res.data) return null;
+      const d = res.data;
+      return {
+        isPlaying: Boolean(d.is_playing),
+        progressMs: Number(d.progress_ms ?? 0),
+        trackUri: d.item?.uri ?? null,
+        durationMs: Number(d.item?.duration_ms ?? 0),
+        // R4-4: expose the account's single active device so a foreign steal is
+        // distinguishable from our own device. Left undefined when absent.
+        activeDeviceId: d.device?.id ?? undefined,
+      };
+    } catch {
+      return null;
+    }
+  }
+}

src/music/spotify/controller.test.ts

@@ -0,0 +1,709 @@
+import { describe, it, expect, beforeAll, afterAll, beforeEach, vi } from "vitest";
+import { EventEmitter } from "node:events";
+import { Readable } from "node:stream";
+import { writeFileSync, rmSync } from "node:fs";
+import { join } from "node:path";
+import { tmpdir } from "node:os";
+import type { Logger } from "pino";
+import type { SpotifyConfig } from "../../data/config.js";
+import type {
+  SpotifyAudioBackend,
+  SpotifyTrackEndedEvent,
+  SpotifyNowPlaying,
+} from "./backend.js";
+import type { SpotifyOAuth } from "./spotify-oauth.js";
+
+// Controllable, hoisted so the vi.mock factory can close over it.
+// go-* keys keep their Stage-2 names (`supported`/`path`) so existing tests are
+// untouched; rust* keys drive the new librespot selection paths.
+const bin = vi.hoisted(() => ({
+  supported: true,
+  path: "",
+  rustSupported: true,
+  rustPath: "",
+}));
+vi.mock("./binary.js", async () => {
+  // existsSync mirrors the real resolveExecutable(find*()) result for the
+  // bin/-style temp paths this suite uses (existingBin exists, missingBin does
+  // not), keeping the chooseBackend/isAvailable matrix behavior-identical.
+  const { existsSync } = await import("node:fs");
+  return {
+    isGoLibrespotSupported: () => bin.supported,
+    findGoLibrespot: () => bin.path,
+    resetGoLibrespotBinaryCache: () => {},
+    checkGoLibrespotAvailable: async () => bin.supported && !!bin.path,
+    isRustLibrespotSupported: () => bin.rustSupported,
+    findLibrespot: () => bin.rustPath,
+    resetLibrespotBinaryCache: () => {},
+    checkLibrespotAvailable: async () => bin.rustSupported && !!bin.rustPath,
+    // PATH-aware presence gates (Bug I3): supported gate AND the resolved
+    // binary actually exists on disk.
+    isGoLibrespotPresent: () => bin.supported && existsSync(bin.path),
+    isLibrespotPresent: () => bin.rustSupported && existsSync(bin.rustPath),
+  };
+});
+
+// Capture options the DEFAULT factory hands to the real GoLibrespotBackend so
+// we can assert per-bot ports (Fix 3) are threaded through. Every other test
+// injects its own backendFactory, so this mock is inert for them.
+const goLibrespotCtor = vi.hoisted(() => vi.fn());
+vi.mock("./go-librespot.js", async () => {
+  const { EventEmitter } = await import("node:events");
+  return {
+    GoLibrespotBackend: class extends EventEmitter {
+      constructor(opts: any) {
+        super();
+        goLibrespotCtor(opts);
+      }
+      async start(): Promise<void> {}
+      isReady(): boolean {
+        return true;
+      }
+      stop(): void {}
+      async playTrack(): Promise<void> {}
+      async pause(): Promise<void> {}
+      async resume(): Promise<void> {}
+      async seek(): Promise<void> {}
+      getPcmStream(): any {
+        return null;
+      }
+      getPositionMs(): number {
+        return 0;
+      }
+    },
+  };
+});
+
+// Import AFTER vi.mock so the mocked binary module is used.
+const { SpotifyController, perBotDeviceName } = await import("./controller.js");
+
+const existingBin = join(tmpdir(), `tsmb-golibrespot-${process.pid}`);
+const missingBin = join(tmpdir(), `tsmb-golibrespot-missing-${process.pid}`);
+
+beforeAll(() => {
+  writeFileSync(existingBin, "#!/bin/sh\n");
+});
+afterAll(() => {
+  try {
+    rmSync(existingBin);
+  } catch {
+    /* ignore */
+  }
+});
+beforeEach(() => {
+  bin.supported = true;
+  bin.path = existingBin;
+  bin.rustSupported = true;
+  bin.rustPath = missingBin;
+});
+
+class FakeBackend extends EventEmitter implements SpotifyAudioBackend {
+  startCalls = 0;
+  stopCalls = 0;
+  playCalls: string[] = [];
+  pauseCalls = 0;
+  resumeCalls = 0;
+  seekCalls: number[] = [];
+  ready = false;
+  startShouldReject = false;
+  playShouldReject = false;
+  /** When set, start() awaits this before resolving — lets a test interleave
+   *  stop()/error DURING a mid-flight start (Bug I1). */
+  startGate?: Promise<void>;
+  readonly pcm = Readable.from([Buffer.alloc(0)]);
+
+  async start(): Promise<void> {
+    this.startCalls++;
+    if (this.startGate) await this.startGate;
+    if (this.startShouldReject) throw new Error("start boom");
+    this.ready = true;
+  }
+  stop(): void {
+    this.stopCalls++;
+    this.ready = false;
+  }
+  isReady(): boolean {
+    return this.ready;
+  }
+  async playTrack(uri: string): Promise<void> {
+    this.playCalls.push(uri);
+    if (this.playShouldReject) throw new Error("play boom");
+  }
+  async pause(): Promise<void> {
+    this.pauseCalls++;
+  }
+  async resume(): Promise<void> {
+    this.resumeCalls++;
+  }
+  async seek(ms: number): Promise<void> {
+    this.seekCalls.push(ms);
+  }
+  getPcmStream(): Readable {
+    return this.pcm;
+  }
+  getPositionMs(): number {
+    return 0;
+  }
+}
+
+const silentLogger = {
+  info() {},
+  error() {},
+  warn() {},
+  debug() {},
+  trace() {},
+  fatal() {},
+  child() {
+    return silentLogger;
+  },
+} as unknown as Logger;
+
+function cfg(over: Partial<SpotifyConfig> = {}): SpotifyConfig {
+  return {
+    enabled: true,
+    backend: "auto",
+    clientId: "",
+    clientSecret: "",
+    deviceName: "TSMusicBot",
+    bitrate: 320,
+    ...over,
+  };
+}
+
+function makeCtrl(over: {
+  config?: Partial<SpotifyConfig>;
+  backendFactory?: () => SpotifyAudioBackend;
+  oauth?: import("./spotify-oauth.js").SpotifyOAuth;
+} = {}) {
+  const be = new FakeBackend();
+  const ctrl = new SpotifyController({
+    config: cfg(over.config),
+    workDir: "/tmp/work",
+    configDir: "/tmp/cfg",
+    logger: silentLogger,
+    backendFactory: over.backendFactory ?? (() => be),
+    oauth: over.oauth,
+  });
+  return { ctrl, be };
+}
+
+function fakeOAuth(
+  authorized: boolean,
+  hooks: { onIsAuthorized?: () => void } = {},
+): SpotifyOAuth {
+  return {
+    isAuthorized: () => {
+      hooks.onIsAuthorized?.();
+      return authorized;
+    },
+    getAccessToken: async () => (authorized ? "tok" : null),
+    getClientId: () => "cid",
+    getRedirectUri: () => "http://127.0.0.1:5588/login",
+    buildAuthorizeUrl: () => ({ url: "https://accounts.spotify.com/authorize", state: "s" }),
+    handleCallback: async () => true,
+  } as unknown as SpotifyOAuth;
+}
+
+describe("SpotifyController.isAvailable", () => {
+  it("true when enabled + supported + binary present", () => {
+    const { ctrl } = makeCtrl();
+    expect(ctrl.isAvailable()).toBe(true);
+  });
+  it("false when config disabled", () => {
+    const { ctrl } = makeCtrl({ config: { enabled: false } });
+    expect(ctrl.isAvailable()).toBe(false);
+  });
+  it("false when platform unsupported", () => {
+    bin.supported = false;
+    const { ctrl } = makeCtrl();
+    expect(ctrl.isAvailable()).toBe(false);
+  });
+  it("false when binary file is absent", () => {
+    bin.path = missingBin;
+    const { ctrl } = makeCtrl();
+    expect(ctrl.isAvailable()).toBe(false);
+  });
+});
+
+describe("SpotifyController.ensureStarted", () => {
+  it("starts the backend exactly once across repeated calls", async () => {
+    let built = 0;
+    const be = new FakeBackend();
+    const { ctrl } = makeCtrl({
+      backendFactory: () => {
+        built++;
+        return be;
+      },
+    });
+    expect(await ctrl.ensureStarted()).toBe(true);
+    expect(await ctrl.ensureStarted()).toBe(true);
+    expect(built).toBe(1);
+    expect(be.startCalls).toBe(1);
+  });
+
+  it("is idempotent under concurrent calls (single start)", async () => {
+    let built = 0;
+    const be = new FakeBackend();
+    const { ctrl } = makeCtrl({
+      backendFactory: () => {
+        built++;
+        return be;
+      },
+    });
+    const [a, b] = await Promise.all([ctrl.ensureStarted(), ctrl.ensureStarted()]);
+    expect(a).toBe(true);
+    expect(b).toBe(true);
+    expect(built).toBe(1);
+    expect(be.startCalls).toBe(1);
+  });
+
+  it("returns false and does not build a backend when unavailable", async () => {
+    let built = 0;
+    const { ctrl } = makeCtrl({
+      config: { enabled: false },
+      backendFactory: () => {
+        built++;
+        return new FakeBackend();
+      },
+    });
+    expect(await ctrl.ensureStarted()).toBe(false);
+    expect(built).toBe(0);
+  });
+
+  it("returns false when backend.start() throws, and allows a later retry", async () => {
+    const be = new FakeBackend();
+    be.startShouldReject = true;
+    let built = 0;
+    const { ctrl } = makeCtrl({
+      backendFactory: () => {
+        built++;
+        return be;
+      },
+    });
+    expect(await ctrl.ensureStarted()).toBe(false);
+    // start failure clears the cached promise so a subsequent call retries.
+    be.startShouldReject = false;
+    expect(await ctrl.ensureStarted()).toBe(true);
+    expect(built).toBe(2);
+    expect(be.startCalls).toBe(2);
+  });
+});
+
+describe("SpotifyController.playTrack", () => {
+  it("ensures started then delegates the uri, returning true", async () => {
+    const { ctrl, be } = makeCtrl();
+    expect(await ctrl.playTrack("spotify:track:abc")).toBe(true);
+    expect(be.startCalls).toBe(1);
+    expect(be.playCalls).toEqual(["spotify:track:abc"]);
+  });
+  it("returns false when the controller is unavailable", async () => {
+    const { ctrl, be } = makeCtrl({ config: { enabled: false } });
+    expect(await ctrl.playTrack("spotify:track:abc")).toBe(false);
+    expect(be.playCalls).toEqual([]);
+  });
+  it("returns false when backend.playTrack rejects", async () => {
+    const be = new FakeBackend();
+    be.playShouldReject = true;
+    const { ctrl } = makeCtrl({ backendFactory: () => be });
+    expect(await ctrl.playTrack("spotify:track:abc")).toBe(false);
+  });
+});
+
+describe("SpotifyController transport delegation", () => {
+  it("pause/resume/seek forward to the backend after start", async () => {
+    const { ctrl, be } = makeCtrl();
+    await ctrl.ensureStarted();
+    await ctrl.pause();
+    await ctrl.resume();
+    await ctrl.seek(4200);
+    expect(be.pauseCalls).toBe(1);
+    expect(be.resumeCalls).toBe(1);
+    expect(be.seekCalls).toEqual([4200]);
+  });
+  it("pause/resume/seek are safe no-ops before start", async () => {
+    const { ctrl, be } = makeCtrl();
+    await expect(ctrl.pause()).resolves.toBeUndefined();
+    await expect(ctrl.resume()).resolves.toBeUndefined();
+    await expect(ctrl.seek(10)).resolves.toBeUndefined();
+    expect(be.pauseCalls).toBe(0);
+  });
+  it("getPcmStream returns the backend stream", async () => {
+    const { ctrl, be } = makeCtrl();
+    await ctrl.ensureStarted();
+    expect(ctrl.getPcmStream()).toBe(be.pcm);
+  });
+  it("getPcmStream throws before the backend is started", () => {
+    const { ctrl } = makeCtrl();
+    expect(() => ctrl.getPcmStream()).toThrow();
+  });
+});
+
+// R4-1: the web progress bar computes seekTime = ratio * duration (fractional
+// seconds); BotInstance routes Spotify seeks through seek(seconds * 1000),
+// yielding a NON-integer ms (e.g. 71610.00000000001). go-librespot decodes
+// `position` into an int64 and Go's encoding/json REJECTS a JSON number with a
+// decimal point -> HTTP 400 -> the error is swallowed -> the track never seeks.
+// The controller must round ONCE so BOTH backends get a valid integer ms.
+describe("SpotifyController.seek integer rounding (R4-1)", () => {
+  it("rounds a fractional seek to an integer ms before forwarding to the backend", async () => {
+    const { ctrl, be } = makeCtrl();
+    await ctrl.ensureStarted();
+    await ctrl.seek(71610.00000000001);
+    expect(be.seekCalls).toHaveLength(1);
+    expect(Number.isInteger(be.seekCalls[0])).toBe(true);
+    expect(be.seekCalls[0]).toBe(71610);
+  });
+
+  it("clamps a negative seek to 0", async () => {
+    const { ctrl, be } = makeCtrl();
+    await ctrl.ensureStarted();
+    await ctrl.seek(-5);
+    expect(be.seekCalls).toEqual([0]);
+  });
+
+  it("passes an already-integer seek through unchanged", async () => {
+    const { ctrl, be } = makeCtrl();
+    await ctrl.ensureStarted();
+    await ctrl.seek(4200);
+    expect(be.seekCalls).toEqual([4200]);
+  });
+});
+
+describe("SpotifyController event re-emission", () => {
+  it("re-emits backend trackEnded with the same payload", async () => {
+    const { ctrl, be } = makeCtrl();
+    await ctrl.ensureStarted();
+    const got: SpotifyTrackEndedEvent[] = [];
+    ctrl.on("trackEnded", (e) => got.push(e));
+    const evt: SpotifyTrackEndedEvent = { uri: "spotify:track:x", reason: "ended" };
+    be.emit("trackEnded", evt);
+    expect(got).toEqual([evt]);
+  });
+  it("re-emits backend metadata with the same payload", async () => {
+    const { ctrl, be } = makeCtrl();
+    await ctrl.ensureStarted();
+    const got: SpotifyNowPlaying[] = [];
+    ctrl.on("metadata", (m) => got.push(m));
+    const meta: SpotifyNowPlaying = {
+      uri: "spotify:track:x",
+      name: "Song",
+      artist: "Artist",
+      album: "Album",
+      coverUrl: "http://img",
+      durationMs: 1000,
+    };
+    be.emit("metadata", meta);
+    expect(got).toEqual([meta]);
+  });
+});
+
+describe("SpotifyController backend error handling (C3)", () => {
+  it("does NOT throw on a backend 'error' with no controller listener, and marks not-ready", async () => {
+    const be1 = new FakeBackend();
+    const be2 = new FakeBackend();
+    const backends = [be1, be2];
+    let built = 0;
+    const { ctrl } = makeCtrl({
+      backendFactory: () => {
+        built++;
+        return backends.shift()!;
+      },
+    });
+    await ctrl.ensureStarted();
+    expect(built).toBe(1);
+    // The controller itself has NO "error" listener. A raw re-emit would make
+    // Node throw here; the controller must swallow+log instead.
+    expect(() => be1.emit("error", new Error("sidecar boom"))).not.toThrow();
+    // Marked not-ready: a fresh ensureStarted relaunches a new backend.
+    expect(await ctrl.ensureStarted()).toBe(true);
+    expect(built).toBe(2);
+    expect(be2.startCalls).toBe(1);
+  });
+
+  it("tears down the errored backend (stop + detach + null) so it is not orphaned", async () => {
+    const be1 = new FakeBackend();
+    const be2 = new FakeBackend();
+    const backends = [be1, be2];
+    let built = 0;
+    const { ctrl } = makeCtrl({
+      backendFactory: () => {
+        built++;
+        return backends.shift()!;
+      },
+    });
+    await ctrl.ensureStarted();
+    expect(built).toBe(1);
+
+    // On "error" the controller must stop() the errored backend (cleans its
+    // ffmpeg/go-librespot children + FIFO) and detach ALL its listeners.
+    expect(() => be1.emit("error", new Error("sidecar boom"))).not.toThrow();
+    expect(be1.stopCalls).toBe(1);
+    expect(be1.listenerCount("error")).toBe(0);
+    expect(be1.listenerCount("trackEnded")).toBe(0);
+    expect(be1.listenerCount("metadata")).toBe(0);
+
+    // Internal backend is null: a transport call no-ops (delegates to nothing)
+    // and getPcmStream throws until a rebuild.
+    await ctrl.pause();
+    expect(be1.pauseCalls).toBe(0);
+    expect(() => ctrl.getPcmStream()).toThrow();
+
+    // A fresh ensureStarted builds a NEW backend instance.
+    expect(await ctrl.ensureStarted()).toBe(true);
+    expect(built).toBe(2);
+    expect(be2.startCalls).toBe(1);
+    expect(ctrl.getPcmStream()).toBe(be2.pcm);
+  });
+
+  it("does not cross-talk: a later error from the ORPHANED backend leaves the healthy rebuilt controller ready", async () => {
+    const be1 = new FakeBackend();
+    const be2 = new FakeBackend();
+    const backends = [be1, be2];
+    let built = 0;
+    const { ctrl } = makeCtrl({
+      backendFactory: () => {
+        built++;
+        return backends.shift()!;
+      },
+    });
+    await ctrl.ensureStarted();
+
+    // First error tears down be1 and the controller rebuilds onto healthy be2.
+    be1.emit("error", new Error("sidecar boom"));
+    expect(await ctrl.ensureStarted()).toBe(true);
+    expect(built).toBe(2);
+    await ctrl.pause();
+    expect(be2.pauseCalls).toBe(1);
+
+    // A SECOND error emitted by the OLD (orphaned) backend must NOT reach the
+    // controller: the healthy be2 stays owned, ready, and untouched.
+    be1.on("error", () => {}); // controller detached; re-arm to avoid unhandled throw
+    expect(() => be1.emit("error", new Error("orphan boom"))).not.toThrow();
+    expect(be2.stopCalls).toBe(0); // healthy backend not torn down
+    // Still ready: ensureStarted returns true without rebuilding a third time.
+    expect(await ctrl.ensureStarted()).toBe(true);
+    expect(built).toBe(2);
+    await ctrl.pause();
+    expect(be2.pauseCalls).toBe(2);
+    expect(ctrl.getPcmStream()).toBe(be2.pcm);
+  });
+});
+
+describe("SpotifyController.stop", () => {
+  it("stops the backend and tears down state so a later start rebuilds", async () => {
+    const be1 = new FakeBackend();
+    const be2 = new FakeBackend();
+    const backends = [be1, be2];
+    const { ctrl } = makeCtrl({ backendFactory: () => backends.shift()! });
+    await ctrl.ensureStarted();
+    ctrl.stop();
+    expect(be1.stopCalls).toBe(1);
+    // After teardown getPcmStream is invalid again until re-started.
+    expect(() => ctrl.getPcmStream()).toThrow();
+    // A fresh ensureStarted builds a new backend.
+    expect(await ctrl.ensureStarted()).toBe(true);
+    expect(be2.startCalls).toBe(1);
+  });
+  it("stop before start is a safe no-op", () => {
+    const { ctrl, be } = makeCtrl();
+    expect(() => ctrl.stop()).not.toThrow();
+    expect(be.stopCalls).toBe(0);
+  });
+
+  it("Bug I1: stop() DURING a mid-flight start tears the sidecar down instead of resurrecting it", async () => {
+    // A Deferred the test resolves to complete backend.start() on demand.
+    let resolveStart!: () => void;
+    const startGate = new Promise<void>((res) => {
+      resolveStart = res;
+    });
+    const be = new FakeBackend();
+    be.startGate = startGate;
+    const { ctrl } = makeCtrl({ backendFactory: () => be });
+
+    // Kick off ensureStarted but DO NOT await — start() is parked on the gate.
+    const startedP = ctrl.ensureStarted();
+    // Let the ensureStarted IIFE run up to `await backend.start()`.
+    await Promise.resolve();
+    await Promise.resolve();
+    expect(be.startCalls).toBe(1); // start() was entered and is now pending
+
+    // Caller tears the controller down while start() is still in flight
+    // (a user `!stop`/disconnect). Pre-fix this.backend is still null so this
+    // is a no-op and the spawned sidecar is orphaned.
+    ctrl.stop();
+
+    // Now let start() finally resolve. Pre-fix the IIFE would set this.backend
+    // and started=true, RESURRECTING the sidecar the caller already stopped.
+    resolveStart();
+    const result = await startedP;
+
+    // Post-fix: the mid-flight backend is torn down, not promoted.
+    expect(result).toBe(false);
+    expect(be.stopCalls).toBeGreaterThanOrEqual(1); // the fake WAS stopped
+    expect(be.listenerCount("trackEnded")).toBe(0); // listeners detached
+    expect(() => ctrl.getPcmStream()).toThrow(); // not resurrected
+  });
+});
+
+describe("SpotifyController per-bot ports (Fix 3)", () => {
+  it("threads apiPort + callbackPort into the default GoLibrespotBackend", async () => {
+    goLibrespotCtor.mockClear();
+    // No injected backendFactory → the controller builds the (mocked) real backend.
+    const ctrl = new SpotifyController({
+      config: cfg(),
+      workDir: "/tmp/work",
+      configDir: "/tmp/cfg",
+      logger: silentLogger,
+      apiPort: 3712,
+      callbackPort: 8712,
+    });
+    expect(await ctrl.ensureStarted()).toBe(true);
+    expect(goLibrespotCtor).toHaveBeenCalledWith(
+      expect.objectContaining({ apiPort: 3712, callbackPort: 8712 }),
+    );
+  });
+});
+
+describe("perBotDeviceName (corner-case R2-5)", () => {
+  it("suffixes the base name with the instanceId", () => {
+    expect(perBotDeviceName("TSMusicBot", "bot1")).toBe("TSMusicBot-bot1");
+  });
+  it("returns the base name unchanged when no instanceId is given", () => {
+    expect(perBotDeviceName("TSMusicBot", undefined)).toBe("TSMusicBot");
+  });
+});
+
+describe("SpotifyController per-bot device name (corner-case R2-5)", () => {
+  it("applies the per-bot suffix to the backend deviceName when instanceId is set", async () => {
+    goLibrespotCtor.mockClear();
+    // No injected backendFactory → the controller builds the (mocked) real backend.
+    const ctrl = new SpotifyController({
+      config: cfg(),
+      workDir: "/tmp/work",
+      configDir: "/tmp/cfg",
+      logger: silentLogger,
+      instanceId: "bot1",
+    });
+    expect(await ctrl.ensureStarted()).toBe(true);
+    // The Connect identity is UNIQUE per bot ("<base>-<id>") so two bots under
+    // one account never register the same name (misroute / false-readiness).
+    expect(goLibrespotCtor).toHaveBeenCalledWith(
+      expect.objectContaining({ deviceName: "TSMusicBot-bot1" }),
+    );
+  });
+
+  it("leaves the base deviceName unchanged when no instanceId (behavior-preserving)", async () => {
+    goLibrespotCtor.mockClear();
+    const ctrl = new SpotifyController({
+      config: cfg(),
+      workDir: "/tmp/work",
+      configDir: "/tmp/cfg",
+      logger: silentLogger,
+    });
+    expect(await ctrl.ensureStarted()).toBe(true);
+    expect(goLibrespotCtor).toHaveBeenCalledWith(
+      expect.objectContaining({ deviceName: "TSMusicBot" }),
+    );
+  });
+});
+
+describe("SpotifyController.chooseBackend (platform x config matrix)", () => {
+  function pick(
+    backend: SpotifyConfig["backend"],
+    opts: { go: boolean; goSupported?: boolean; rust: boolean; rustSupported?: boolean },
+  ) {
+    bin.supported = opts.goSupported ?? true;
+    bin.path = opts.go ? existingBin : missingBin;
+    bin.rustSupported = opts.rustSupported ?? true;
+    bin.rustPath = opts.rust ? existingBin : missingBin;
+    const { ctrl } = makeCtrl({ config: { backend } });
+    return ctrl.chooseBackend();
+  }
+
+  it("auto: prefers go-librespot when linux + go binary present", () => {
+    expect(pick("auto", { go: true, rust: true })).toBe("go-librespot");
+  });
+  it("auto: falls back to librespot when go unsupported (e.g. Windows) but librespot present", () => {
+    expect(pick("auto", { go: true, goSupported: false, rust: true })).toBe("librespot");
+  });
+  it("auto: falls back to librespot when go binary is absent", () => {
+    expect(pick("auto", { go: false, rust: true })).toBe("librespot");
+  });
+  it("auto: null when neither backend is usable", () => {
+    expect(pick("auto", { go: false, goSupported: false, rust: false })).toBeNull();
+  });
+  it("go-librespot: selected when supported + present", () => {
+    expect(pick("go-librespot", { go: true, rust: true })).toBe("go-librespot");
+  });
+  it("go-librespot: null when unsupported, even if librespot is present", () => {
+    expect(pick("go-librespot", { go: true, goSupported: false, rust: true })).toBeNull();
+  });
+  it("librespot: selected when the librespot binary is present", () => {
+    expect(pick("librespot", { go: true, rust: true })).toBe("librespot");
+  });
+  it("librespot: null when the librespot binary is absent, even if go is present", () => {
+    expect(pick("librespot", { go: true, rust: false })).toBeNull();
+  });
+});
+
+describe("SpotifyController Rust-backend auth gate", () => {
+  it("isAvailable is true for a present librespot binary regardless of auth", () => {
+    bin.rustPath = existingBin;
+    const { ctrl } = makeCtrl({
+      config: { backend: "librespot" },
+      oauth: fakeOAuth(false),
+    });
+    expect(ctrl.isAvailable()).toBe(true);
+  });
+
+  it("ensureStarted returns false (no backend built) when Rust chosen but unauthorized", async () => {
+    bin.rustPath = existingBin;
+    let built = 0;
+    const { ctrl } = makeCtrl({
+      config: { backend: "librespot" },
+      oauth: fakeOAuth(false),
+      backendFactory: () => {
+        built++;
+        return new FakeBackend();
+      },
+    });
+    expect(await ctrl.ensureStarted()).toBe(false);
+    expect(built).toBe(0);
+  });
+
+  it("ensureStarted starts the Rust backend once authorized", async () => {
+    bin.rustPath = existingBin;
+    const be = new FakeBackend();
+    let built = 0;
+    const { ctrl } = makeCtrl({
+      config: { backend: "librespot" },
+      oauth: fakeOAuth(true),
+      backendFactory: () => {
+        built++;
+        return be;
+      },
+    });
+    expect(await ctrl.ensureStarted()).toBe(true);
+    expect(built).toBe(1);
+    expect(be.startCalls).toBe(1);
+  });
+
+  it("go-librespot path never consults oauth.isAuthorized()", async () => {
+    // auto + go present -> go-librespot; the auth gate must be skipped so a
+    // throwing isAuthorized() is never reached.
+    const oauth = fakeOAuth(false, {
+      onIsAuthorized: () => {
+        throw new Error("isAuthorized must not be called on the go path");
+      },
+    });
+    const { ctrl } = makeCtrl({ config: { backend: "auto" }, oauth });
+    expect(await ctrl.ensureStarted()).toBe(true);
+  });
+
+  it("exposes the shared oauth + connect instances", () => {
+    const oauth = fakeOAuth(true);
+    const { ctrl } = makeCtrl({ config: { backend: "auto" }, oauth });
+    expect(ctrl.getOAuth()).toBe(oauth);
+    expect(ctrl.getConnect()).toBeDefined();
+  });
+});

src/music/spotify/controller.ts

@@ -0,0 +1,405 @@
+import { EventEmitter } from "node:events";
+import {
+  existsSync,
+  readFileSync,
+  writeFileSync,
+  mkdirSync,
+  rmSync,
+} from "node:fs";
+import { dirname, join } from "node:path";
+import type { Readable } from "node:stream";
+import type { Logger } from "pino";
+import type { SpotifyConfig } from "../../data/config.js";
+import type {
+  SpotifyAudioBackend,
+  SpotifyTrackEndedEvent,
+  SpotifyNowPlaying,
+} from "./backend.js";
+import { isGoLibrespotPresent, isLibrespotPresent } from "./binary.js";
+import { GoLibrespotBackend } from "./go-librespot.js";
+import { RustLibrespotBackend } from "./rust-librespot.js";
+import {
+  SpotifyOAuth,
+  type OAuthTokens,
+  type OAuthTokenStore,
+} from "./spotify-oauth.js";
+import { SpotifyConnectApi } from "./connect-api.js";
+import {
+  resolveSpotifyBackendKind,
+  type SpotifyBackendKind,
+} from "./backend-select.js";
+export type { SpotifyBackendKind }; // keep the name exported for existing importers
+
+/**
+ * Derive the per-bot Spotify Connect device name from the user-configured base.
+ *
+ * `config.spotify` is a single process-wide object shared by every BotInstance,
+ * so `config.spotify.deviceName` is identical for all bots. On the Rust
+ * (librespot) backend each bot would otherwise spawn `librespot --name <base>`
+ * with NO uniqueness, registering TWO Connect devices with the SAME name under
+ * the one shared Premium account — so `findDeviceByName` / `waitForDevice`
+ * (which match by name) could target the OTHER bot's device, misrouting
+ * transfer()+play() and reporting false readiness (corner-case R2-5).
+ *
+ * Suffixing the base with the bot's instanceId makes the Connect identity
+ * unique per bot. Pure + deterministic: same inputs → same name across
+ * restarts. Returns the base unchanged when no instanceId is supplied (keeps
+ * existing single-bot / non-injected behavior byte-for-byte).
+ */
+export function perBotDeviceName(base: string, instanceId?: string): string {
+  return instanceId ? `${base}-${instanceId}` : base;
+}
+
+/**
+ * Minimal file-backed OAuth token store used when the caller does not inject a
+ * SpotifyOAuth. Persists the rotating refresh-token JSON next to the bot config
+ * (0600). All IO is lazy + guarded so construction never throws and a
+ * missing/corrupt file simply reads as "unauthorized".
+ */
+class FileOAuthTokenStore implements OAuthTokenStore {
+  constructor(private readonly file: string) {}
+  load(): OAuthTokens | null {
+    try {
+      if (!existsSync(this.file)) return null;
+      return JSON.parse(readFileSync(this.file, "utf8")) as OAuthTokens;
+    } catch {
+      return null;
+    }
+  }
+  save(t: OAuthTokens): void {
+    mkdirSync(dirname(this.file), { recursive: true });
+    writeFileSync(this.file, JSON.stringify(t), { mode: 0o600 });
+  }
+  clear(): void {
+    try {
+      rmSync(this.file, { force: true });
+    } catch {
+      /* ignore */
+    }
+  }
+}
+
+export interface SpotifyControllerOptions {
+  config: SpotifyConfig;
+  workDir: string;
+  configDir: string;
+  logger: Logger;
+  /** Owning bot's id; suffixed onto the shared base deviceName so each bot's
+   *  Spotify Connect identity is unique (avoids multi-bot device collision /
+   *  misroute — corner-case R2-5). Omitted → the base name is used unchanged. */
+  instanceId?: string;
+  /** Per-bot go-librespot control-API port (distinct per bot to avoid binds). */
+  apiPort?: number;
+  /** Per-bot go-librespot OAuth callback port (distinct per bot). */
+  callbackPort?: number;
+  /** Injected for tests; when set it overrides the per-kind default builders. */
+  backendFactory?: () => SpotifyAudioBackend;
+  /** Injected for tests; defaults to a file-backed SpotifyOAuth in configDir. */
+  oauth?: SpotifyOAuth;
+  /** Injected for tests; defaults to a SpotifyConnectApi wired to oauth. */
+  connect?: SpotifyConnectApi;
+}
+
+/**
+ * Per-bot orchestrator for the Spotify sidecar. Selects a backend for this
+ * host+config (chooseBackend), owns backend lifecycle, gates on availability
+ * (config + platform + binary) plus — for the Rust librespot backend — OAuth
+ * authorization, delegates transport, and re-emits "trackEnded"/"metadata" so
+ * BotInstance can advance the queue exactly as for the ffmpeg path.
+ *
+ * Correction C3 (unchanged): this controller does NOT re-emit a raw "error"
+ * event. It subscribes to the backend's "error", logs it, tears the backend
+ * down, and marks itself not-ready so the next ensureStarted() relaunches a
+ * fresh backend. getPcmStream() proxies the backend's SINGLE persistent stream.
+ */
+export class SpotifyController extends EventEmitter {
+  private readonly config: SpotifyConfig;
+  private readonly workDir: string;
+  private readonly configDir: string;
+  private readonly logger: Logger;
+  private readonly instanceId?: string;
+  private readonly apiPort?: number;
+  private readonly callbackPort?: number;
+  private readonly injectedFactory?: () => SpotifyAudioBackend;
+  private readonly oauth: SpotifyOAuth;
+  private readonly connect: SpotifyConnectApi;
+
+  private backend: SpotifyAudioBackend | null = null;
+  // The in-flight backend during a start() that has not yet completed. A
+  // stop()/handleBackendError() DURING start() clears (or replaces) this so the
+  // mid-start sidecar is torn down and a completing start is discarded by the
+  // ensureStarted post-await guard instead of resurrecting a backend the caller
+  // already tore down (Bug I1).
+  private pendingBackend: SpotifyAudioBackend | null = null;
+  private started = false;
+  private startPromise: Promise<boolean> | null = null;
+
+  constructor(o: SpotifyControllerOptions) {
+    super();
+    this.config = o.config;
+    this.workDir = o.workDir;
+    this.configDir = o.configDir;
+    this.logger = o.logger;
+    this.instanceId = o.instanceId;
+    this.apiPort = o.apiPort;
+    this.callbackPort = o.callbackPort;
+    this.injectedFactory = o.backendFactory;
+    // The controller OWNS a shared OAuth + Connect pair (Task 6 web router and
+    // the Rust backend reuse these exact instances). Constructing the defaults
+    // performs no IO/network — the file store loads lazily on first use.
+    this.oauth =
+      o.oauth ??
+      new SpotifyOAuth({
+        store: new FileOAuthTokenStore(
+          join(this.configDir, "spotify-oauth.json"),
+        ),
+      });
+    this.connect =
+      o.connect ??
+      new SpotifyConnectApi(() => this.oauth.getAccessToken(), {
+        logger: this.logger,
+      });
+  }
+
+  /** Shared OAuth client (web router + Rust backend reuse this instance). */
+  getOAuth(): SpotifyOAuth {
+    return this.oauth;
+  }
+
+  /** Shared Connect API client (Rust backend reuses this instance). */
+  getConnect(): SpotifyConnectApi {
+    return this.connect;
+  }
+
+  private goPresent(): boolean {
+    // PATH-aware, sync presence gate (Bug I3): a bare PATH-installed binary is
+    // resolved against $PATH, not existsSync()'d against process.cwd().
+    return isGoLibrespotPresent();
+  }
+
+  private rustPresent(): boolean {
+    return isLibrespotPresent();
+  }
+
+  /**
+   * Resolve which backend to run for this platform + config, or null when none
+   * is usable (caller falls back to the Stage-1 sentinel message):
+   *   "go-librespot" -> GoLibrespot iff supported (linux) + binary present
+   *   "librespot"    -> Rust iff librespot(.exe) present (all platforms)
+   *   "auto"         -> GoLibrespot when (linux + go binary), else Rust when
+   *                     librespot present, else null.
+   */
+  chooseBackend(): SpotifyBackendKind | null {
+    return resolveSpotifyBackendKind(
+      this.config.backend,
+      this.goPresent(),
+      this.rustPresent(),
+    );
+  }
+
+  /** enabled in config AND a backend is selectable (platform + binary present). */
+  isAvailable(): boolean {
+    return this.config.enabled && this.chooseBackend() !== null;
+  }
+
+  /** Build the concrete backend for the chosen kind (or the injected fake). */
+  private buildBackend(kind: SpotifyBackendKind): SpotifyAudioBackend {
+    if (this.injectedFactory) return this.injectedFactory();
+    // Compute the effective (per-bot-unique) Connect device name ONCE and pass
+    // the SAME value to whichever backend we build, so `librespot --name`,
+    // findDeviceByName(), and waitForDevice() all key on one identity — that
+    // consistency is what prevents the multi-bot misroute / false-readiness
+    // (corner-case R2-5). The user-configured base (config.deviceName) is left
+    // untouched; the suffix is applied only to the backend/Connect identity.
+    const deviceName = perBotDeviceName(this.config.deviceName, this.instanceId);
+    if (kind === "librespot") {
+      return new RustLibrespotBackend({
+        deviceName,
+        bitrate: this.config.bitrate,
+        cacheDir: join(this.workDir, "librespot-cache"),
+        oauth: this.oauth,
+        connect: this.connect,
+        logger: this.logger,
+      });
+    }
+    return new GoLibrespotBackend({
+      deviceName,
+      bitrate: this.config.bitrate,
+      workDir: this.workDir,
+      configDir: this.configDir,
+      apiPort: this.apiPort,
+      callbackPort: this.callbackPort,
+      logger: this.logger,
+    });
+  }
+
+  /**
+   * Idempotently start the selected backend. Returns false (without building a
+   * backend) when unavailable, or — for the Rust backend — when OAuth is not
+   * yet authorized, so callers show the login-needed / fallback message. A
+   * failed start clears the cached promise so a later call can retry.
+   */
+  async ensureStarted(): Promise<boolean> {
+    if (!this.isAvailable()) return false;
+    const kind = this.chooseBackend();
+    if (!kind) return false;
+    // The Rust librespot device only appears in Spotify Connect once the user
+    // has authorized OAuth; without it, do not spawn a dead sidecar.
+    if (kind === "librespot" && !this.oauth.isAuthorized()) return false;
+
+    if (this.started) {
+      if (this.backend?.isReady()) return true;
+      this.stop();
+    }
+    if (this.startPromise) return this.startPromise;
+
+    this.startPromise = (async () => {
+      const backend = this.buildBackend(kind);
+      // Publish the in-flight backend BEFORE the (potentially ~20s) start()
+      // await so a concurrent stop()/handleBackendError() can reach and tear
+      // down this mid-start sidecar (Bug I1).
+      this.pendingBackend = backend;
+      backend.on("trackEnded", (e: SpotifyTrackEndedEvent) =>
+        this.emit("trackEnded", e),
+      );
+      backend.on("metadata", (m: SpotifyNowPlaying) =>
+        this.emit("metadata", m),
+      );
+      // C3: do NOT re-emit "error". Log and mark not-ready so the next
+      // ensureStarted() relaunches a fresh backend.
+      backend.on("error", (err?: unknown) => this.handleBackendError(err));
+      try {
+        await backend.start();
+      } catch (err) {
+        this.logger.error({ err }, "Spotify backend failed to start");
+        if (this.pendingBackend === backend) this.pendingBackend = null;
+        this.startPromise = null;
+        return false;
+      }
+      // Post-await guard (Bug I1): if teardown ran DURING start() — stop() or
+      // handleBackendError() cleared/replaced pendingBackend — do NOT promote
+      // this backend. Tear the just-started sidecar down so it is neither
+      // leaked nor resurrected, and report failure to the caller.
+      if (this.pendingBackend !== backend) {
+        this.teardownBackend(
+          backend,
+          "Spotify backend stop() threw tearing down a superseded start",
+        );
+        return false;
+      }
+      this.pendingBackend = null;
+      this.backend = backend;
+      this.started = true;
+      return true;
+    })();
+    return this.startPromise;
+  }
+
+  /**
+   * Stop a backend and detach ALL its listeners, swallowing+logging any throw
+   * from stop() so teardown never propagates. Shared by the error/stop paths
+   * and the ensureStarted post-await guard.
+   */
+  private teardownBackend(be: SpotifyAudioBackend, stopMsg: string): void {
+    try {
+      be.stop();
+    } catch (stopErr) {
+      this.logger.error({ err: stopErr }, stopMsg);
+    }
+    (be as unknown as EventEmitter).removeAllListeners();
+  }
+
+  /**
+   * Tear down an in-flight (mid-start) backend so a start() still awaiting is
+   * discarded by ensureStarted's post-await guard rather than promoted, and its
+   * spawned sidecar is killed rather than orphaned (Bug I1).
+   */
+  private teardownPendingBackend(): void {
+    if (!this.pendingBackend) return;
+    this.teardownBackend(
+      this.pendingBackend,
+      "Spotify backend stop() threw tearing down in-flight start",
+    );
+    this.pendingBackend = null;
+  }
+
+  /**
+   * C3 backend-error handler. Never re-emits "error" (an unhandled "error" on
+   * an EventEmitter throws). Logs, tears the errored backend down, and marks
+   * the controller not-ready so the next ensureStarted() relaunches it.
+   */
+  private handleBackendError(err: unknown): void {
+    this.logger.error({ err }, "Spotify backend error; marking not-ready");
+    if (this.backend) {
+      this.teardownBackend(
+        this.backend,
+        "Spotify backend stop() threw during error teardown",
+      );
+    }
+    this.backend = null;
+    // Also kill an in-flight start so its post-await guard discards it.
+    this.teardownPendingBackend();
+    this.started = false;
+    this.startPromise = null;
+  }
+
+  /** Ensure started, then play the spotify: URI. False on any failure. */
+  async playTrack(uri: string): Promise<boolean> {
+    const ok = await this.ensureStarted();
+    if (!ok || !this.backend) return false;
+    try {
+      await this.backend.playTrack(uri);
+      return true;
+    } catch (err) {
+      this.logger.error({ err, uri }, "Spotify playTrack failed");
+      return false;
+    }
+  }
+
+  async pause(): Promise<void> {
+    if (this.backend) await this.backend.pause();
+  }
+
+  async resume(): Promise<void> {
+    if (this.backend) await this.backend.resume();
+  }
+
+  async seek(ms: number): Promise<void> {
+    // R4-1: round to an integer ms ONCE here so BOTH backends receive a valid
+    // integer position. The web progress bar computes seekTime = ratio *
+    // duration (fractional seconds), so seek(seconds * 1000) is a NON-integer ms
+    // (e.g. 71610.00000000001). go-librespot decodes `position` into an int64
+    // and Go's encoding/json rejects a JSON number with a decimal point → HTTP
+    // 400 → the error is swallowed → the track never seeks. The Spotify Web API
+    // (Rust path) likewise expects an integer position_ms. Clamp negatives to 0.
+    const position = Math.max(0, Math.round(ms));
+    if (this.backend) await this.backend.seek(position);
+  }
+
+  getPcmStream(): Readable {
+    if (!this.backend) {
+      throw new Error("Spotify backend not started");
+    }
+    return this.backend.getPcmStream();
+  }
+
+  /**
+   * Tear down the backend and reset lifecycle state (safe before start).
+   * Mirrors handleBackendError's teardown so the NEXT ensureStarted() rebuilds
+   * a fresh backend.
+   */
+  stop(): void {
+    if (this.backend) {
+      this.teardownBackend(
+        this.backend,
+        "Spotify backend stop() threw during teardown",
+      );
+    }
+    this.backend = null;
+    // Also kill an in-flight start so its post-await guard discards it rather
+    // than resurrecting the sidecar this stop() just tore down (Bug I1).
+    this.teardownPendingBackend();
+    this.started = false;
+    this.startPromise = null;
+  }
+}

src/music/spotify/go-librespot-api.test.ts

@@ -0,0 +1,299 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { EventEmitter } from "node:events";
+import type { AxiosInstance } from "axios";
+import { GoLibrespotRestClient, GoLibrespotEventClient } from "./go-librespot-api.js";
+
+/** Minimal axios stub: only get/post are exercised by the client. */
+function makeHttp(overrides?: Partial<Record<"get" | "post", any>>) {
+  return {
+    get: vi.fn().mockResolvedValue({ status: 200, data: {} }),
+    post: vi.fn().mockResolvedValue({ status: 200, data: {} }),
+    ...overrides,
+  } as unknown as AxiosInstance;
+}
+
+describe("GoLibrespotRestClient", () => {
+  it("ping() returns true on GET / -> 200", async () => {
+    const http = makeHttp();
+    const client = new GoLibrespotRestClient("http://127.0.0.1:3678", { http });
+    await expect(client.ping()).resolves.toBe(true);
+    expect(http.get).toHaveBeenCalledWith("/");
+  });
+
+  it("ping() returns false when GET / rejects (daemon not up)", async () => {
+    const http = makeHttp({ get: vi.fn().mockRejectedValue(new Error("ECONNREFUSED")) });
+    const client = new GoLibrespotRestClient("http://127.0.0.1:3678", { http });
+    await expect(client.ping()).resolves.toBe(false);
+  });
+
+  it("playTrack() POSTs /player/play with the uri body", async () => {
+    const http = makeHttp();
+    const client = new GoLibrespotRestClient("http://127.0.0.1:3678", { http });
+    await client.playTrack("spotify:track:abc123");
+    expect(http.post).toHaveBeenCalledWith("/player/play", { uri: "spotify:track:abc123" });
+  });
+
+  it("pause/resume/stop POST their bodyless endpoints", async () => {
+    const http = makeHttp();
+    const client = new GoLibrespotRestClient("http://127.0.0.1:3678", { http });
+    await client.pause();
+    await client.resume();
+    await client.stop();
+    expect(http.post).toHaveBeenNthCalledWith(1, "/player/pause");
+    expect(http.post).toHaveBeenNthCalledWith(2, "/player/resume");
+    expect(http.post).toHaveBeenNthCalledWith(3, "/player/stop");
+  });
+
+  it("seek() POSTs /player/seek with position(ms) and relative:false", async () => {
+    const http = makeHttp();
+    const client = new GoLibrespotRestClient("http://127.0.0.1:3678", { http });
+    await client.seek(42000);
+    expect(http.post).toHaveBeenCalledWith("/player/seek", { position: 42000, relative: false });
+  });
+
+  it("playTrack() rejects when the POST fails (surfaced to caller)", async () => {
+    const http = makeHttp({ post: vi.fn().mockRejectedValue(new Error("boom")) });
+    const client = new GoLibrespotRestClient("http://127.0.0.1:3678", { http });
+    await expect(client.playTrack("spotify:track:x")).rejects.toThrow("boom");
+  });
+
+  it("getStatus() normalizes the /status shape (ms position/duration)", async () => {
+    const http = makeHttp({
+      get: vi.fn().mockResolvedValue({
+        status: 200,
+        data: {
+          stopped: false,
+          paused: false,
+          buffering: false,
+          track: {
+            uri: "spotify:track:abc",
+            name: "Song",
+            artist_names: ["A", "B"],
+            album_name: "Alb",
+            album_cover_url: "https://i.scdn.co/c.jpg",
+            position: 12345,
+            duration: 200000,
+          },
+        },
+      }),
+    });
+    const client = new GoLibrespotRestClient("http://127.0.0.1:3678", { http });
+    const status = await client.getStatus();
+    expect(http.get).toHaveBeenCalledWith("/status");
+    expect(status).toEqual({
+      stopped: false,
+      paused: false,
+      buffering: false,
+      track: {
+        uri: "spotify:track:abc",
+        name: "Song",
+        artist_names: ["A", "B"],
+        album_name: "Alb",
+        album_cover_url: "https://i.scdn.co/c.jpg",
+        position: 12345,
+        duration: 200000,
+      },
+    });
+  });
+
+  it("getStatus() returns null with a null track when nothing is loaded", async () => {
+    const http = makeHttp({ get: vi.fn().mockResolvedValue({ status: 200, data: { stopped: true, paused: false, buffering: false, track: null } }) });
+    const client = new GoLibrespotRestClient("http://127.0.0.1:3678", { http });
+    const status = await client.getStatus();
+    expect(status).toEqual({ stopped: true, paused: false, buffering: false, track: null });
+  });
+
+  it("getStatus() returns null when GET /status rejects", async () => {
+    const http = makeHttp({ get: vi.fn().mockRejectedValue(new Error("down")) });
+    const client = new GoLibrespotRestClient("http://127.0.0.1:3678", { http });
+    await expect(client.getStatus()).resolves.toBeNull();
+  });
+});
+
+/** Fake ws: records instances, lets tests drive open/message/close/error. */
+class FakeWebSocket extends EventEmitter {
+  static instances: FakeWebSocket[] = [];
+  closed = false;
+  constructor(public url: string) {
+    super();
+    FakeWebSocket.instances.push(this);
+  }
+  close() {
+    this.closed = true;
+    this.emit("close");
+  }
+}
+
+function frame(type: string, data: unknown): Buffer {
+  return Buffer.from(JSON.stringify({ type, data }));
+}
+
+describe("GoLibrespotEventClient", () => {
+  beforeEach(() => {
+    FakeWebSocket.instances = [];
+  });
+
+  it("emits 'not_playing' (track-end) with its data payload", () => {
+    const client = new GoLibrespotEventClient("ws://127.0.0.1:3678/events", {
+      WebSocketCtor: FakeWebSocket as any,
+    });
+    const onEnded = vi.fn();
+    client.on("not_playing", onEnded);
+    client.start();
+
+    const ws = FakeWebSocket.instances[0];
+    expect(ws.url).toBe("ws://127.0.0.1:3678/events");
+    ws.emit("message", frame("not_playing", { uri: "spotify:track:abc", play_origin: "go-librespot" }));
+
+    expect(onEnded).toHaveBeenCalledTimes(1);
+    expect(onEnded).toHaveBeenCalledWith({ uri: "spotify:track:abc", play_origin: "go-librespot" });
+    client.stop();
+  });
+
+  it("emits 'metadata' with the now-playing object", () => {
+    const client = new GoLibrespotEventClient("ws://127.0.0.1:3678/events", {
+      WebSocketCtor: FakeWebSocket as any,
+    });
+    const onMeta = vi.fn();
+    client.on("metadata", onMeta);
+    client.start();
+
+    FakeWebSocket.instances[0].emit(
+      "message",
+      frame("metadata", { uri: "spotify:track:xyz", name: "Song", artist_names: ["Q"], duration: 200000 }),
+    );
+
+    expect(onMeta).toHaveBeenCalledWith({ uri: "spotify:track:xyz", name: "Song", artist_names: ["Q"], duration: 200000 });
+    client.stop();
+  });
+
+  it("ignores non-JSON frames without throwing", () => {
+    const client = new GoLibrespotEventClient("ws://x/events", { WebSocketCtor: FakeWebSocket as any });
+    const onAny = vi.fn();
+    client.on("metadata", onAny);
+    client.start();
+    expect(() => FakeWebSocket.instances[0].emit("message", Buffer.from("not json"))).not.toThrow();
+    expect(onAny).not.toHaveBeenCalled();
+    client.stop();
+  });
+
+  it("reconnects with backoff after the socket closes", () => {
+    vi.useFakeTimers();
+    try {
+      const client = new GoLibrespotEventClient("ws://x/events", { WebSocketCtor: FakeWebSocket as any });
+      client.start();
+      expect(FakeWebSocket.instances).toHaveLength(1);
+
+      FakeWebSocket.instances[0].emit("close");
+      expect(FakeWebSocket.instances).toHaveLength(1); // not immediate
+      vi.advanceTimersByTime(500);
+      expect(FakeWebSocket.instances).toHaveLength(2); // reconnected
+      client.stop();
+    } finally {
+      vi.useRealTimers();
+    }
+  });
+
+  it("stop() closes the socket and prevents reconnect", () => {
+    vi.useFakeTimers();
+    try {
+      const client = new GoLibrespotEventClient("ws://x/events", { WebSocketCtor: FakeWebSocket as any });
+      client.start();
+      const ws = FakeWebSocket.instances[0];
+      client.stop();
+      expect(ws.closed).toBe(true);
+      vi.advanceTimersByTime(60000);
+      expect(FakeWebSocket.instances).toHaveLength(1); // no new socket
+    } finally {
+      vi.useRealTimers();
+    }
+  });
+
+  it("does not throw on socket 'error' when no error listener is attached", () => {
+    const client = new GoLibrespotEventClient("ws://x/events", { WebSocketCtor: FakeWebSocket as any });
+    client.start();
+    expect(() => FakeWebSocket.instances[0].emit("error", new Error("net"))).not.toThrow();
+    client.stop();
+  });
+
+  // R4-3: a WS drop at a track boundary can lose the not_playing/stopped event.
+  // After a successful RE-open the client emits "reconnected" so the backend can
+  // re-query GET /status and reconcile. The FIRST connect must NOT emit it (there
+  // is nothing to reconcile yet).
+  it("emits 'reconnected' after a reconnect open, but NOT on the initial connect", () => {
+    vi.useFakeTimers();
+    try {
+      const client = new GoLibrespotEventClient("ws://x/events", { WebSocketCtor: FakeWebSocket as any });
+      const onReconnected = vi.fn();
+      client.on("reconnected", onReconnected);
+      client.start();
+
+      FakeWebSocket.instances[0].emit("open"); // initial connect
+      expect(onReconnected).not.toHaveBeenCalled(); // no re-sync on first connect
+
+      FakeWebSocket.instances[0].emit("close");
+      vi.advanceTimersByTime(500);
+      expect(FakeWebSocket.instances).toHaveLength(2); // reconnected socket
+      FakeWebSocket.instances[1].emit("open"); // reconnect open
+      expect(onReconnected).toHaveBeenCalledTimes(1);
+      client.stop();
+    } finally {
+      vi.useRealTimers();
+    }
+  });
+
+  // R4-5: a socket that is accepted then immediately closed (a flap) must let the
+  // exponential backoff GROW — the old code reset it to 500ms on every 'open',
+  // pinning reconnects at ~2 Hz.
+  it("grows the reconnect backoff across open→immediate-close flaps (no 500ms pin)", () => {
+    vi.useFakeTimers();
+    try {
+      const client = new GoLibrespotEventClient("ws://x/events", { WebSocketCtor: FakeWebSocket as any });
+      client.start();
+      // Flap #1: accept then immediately drop -> next reconnect at 500ms.
+      FakeWebSocket.instances[0].emit("open");
+      FakeWebSocket.instances[0].emit("close");
+      vi.advanceTimersByTime(500);
+      expect(FakeWebSocket.instances).toHaveLength(2);
+
+      // Flap #2: accept then immediately drop -> backoff has doubled to 1000ms.
+      FakeWebSocket.instances[1].emit("open");
+      FakeWebSocket.instances[1].emit("close");
+      vi.advanceTimersByTime(500);
+      expect(FakeWebSocket.instances).toHaveLength(2); // still 2: 500ms is NOT enough now
+      vi.advanceTimersByTime(500);
+      expect(FakeWebSocket.instances).toHaveLength(3); // reconnects only after 1000ms
+      client.stop();
+    } finally {
+      vi.useRealTimers();
+    }
+  });
+
+  // R4-5: once a connection has been STABLE (up for >= STABLE_CONNECTION_MS) the
+  // backoff resets, so a later drop reconnects promptly again.
+  it("resets the reconnect backoff after a stable connection", () => {
+    vi.useFakeTimers();
+    try {
+      const client = new GoLibrespotEventClient("ws://x/events", { WebSocketCtor: FakeWebSocket as any });
+      client.start();
+      // Flap once to grow the backoff to 1000ms.
+      FakeWebSocket.instances[0].emit("open");
+      FakeWebSocket.instances[0].emit("close");
+      vi.advanceTimersByTime(500);
+      expect(FakeWebSocket.instances).toHaveLength(2);
+
+      // Now a STABLE connection: open and stay up past the stability threshold.
+      FakeWebSocket.instances[1].emit("open");
+      vi.advanceTimersByTime(5000); // >= STABLE_CONNECTION_MS -> backoff reset to 500
+
+      FakeWebSocket.instances[1].emit("close");
+      vi.advanceTimersByTime(499);
+      expect(FakeWebSocket.instances).toHaveLength(2); // not yet
+      vi.advanceTimersByTime(1);
+      expect(FakeWebSocket.instances).toHaveLength(3); // reconnected at 500ms -> backoff was reset
+      client.stop();
+    } finally {
+      vi.useRealTimers();
+    }
+  });
+});

src/music/spotify/go-librespot-api.ts

@@ -0,0 +1,235 @@
+import { EventEmitter } from "node:events";
+import axios, { type AxiosInstance } from "axios";
+import WebSocket from "ws";
+
+export interface GoLibrespotStatusTrack {
+  uri: string;
+  name: string;
+  artist_names: string[];
+  album_name: string;
+  album_cover_url: string | null;
+  position: number;
+  duration: number;
+}
+
+export interface GoLibrespotStatus {
+  stopped: boolean;
+  paused: boolean;
+  buffering: boolean;
+  track: GoLibrespotStatusTrack | null;
+}
+
+export class GoLibrespotRestClient {
+  private http: AxiosInstance;
+
+  constructor(baseUrl: string, deps?: { http?: AxiosInstance }) {
+    this.http =
+      deps?.http ??
+      axios.create({
+        baseURL: baseUrl,
+        timeout: 10000,
+        headers: { "Content-Type": "application/json" },
+      });
+  }
+
+  async ping(): Promise<boolean> {
+    try {
+      const res = await this.http.get("/");
+      return res.status === 200;
+    } catch {
+      return false;
+    }
+  }
+
+  async playTrack(uri: string): Promise<void> {
+    await this.http.post("/player/play", { uri });
+  }
+
+  async pause(): Promise<void> {
+    await this.http.post("/player/pause");
+  }
+
+  async resume(): Promise<void> {
+    await this.http.post("/player/resume");
+  }
+
+  async stop(): Promise<void> {
+    await this.http.post("/player/stop");
+  }
+
+  async seek(ms: number): Promise<void> {
+    await this.http.post("/player/seek", { position: ms, relative: false });
+  }
+
+  async getStatus(): Promise<GoLibrespotStatus | null> {
+    try {
+      const res = await this.http.get("/status");
+      const d = res.data ?? {};
+      const t = d.track;
+      return {
+        stopped: Boolean(d.stopped),
+        paused: Boolean(d.paused),
+        buffering: Boolean(d.buffering),
+        track: t
+          ? {
+              uri: t.uri ?? "",
+              name: t.name ?? "",
+              artist_names: Array.isArray(t.artist_names) ? t.artist_names : [],
+              album_name: t.album_name ?? "",
+              album_cover_url: t.album_cover_url ?? null,
+              position: t.position ?? 0,
+              duration: t.duration ?? 0,
+            }
+          : null,
+      };
+    } catch {
+      return null;
+    }
+  }
+}
+
+export type GoLibrespotEventType =
+  | "metadata"
+  | "playing"
+  | "paused"
+  | "not_playing"
+  | "stopped"
+  | "will_play"
+  | "seek"
+  | "active"
+  | "inactive"
+  | "volume"
+  | "playback_ready";
+
+interface WsLike {
+  on(event: string, cb: (...args: any[]) => void): void;
+  close(): void;
+}
+type WebSocketCtor = new (url: string) => WsLike;
+
+const INITIAL_RECONNECT_MS = 500;
+const MAX_RECONNECT_MS = 10000;
+// R4-5: a connection must stay up at least this long before we treat it as
+// "stable" and reset the reconnect backoff. A socket that is accepted and then
+// immediately closed (a flap) never reaches this, so the exponential backoff
+// keeps growing instead of pinning the reconnect interval at INITIAL_RECONNECT_MS.
+const STABLE_CONNECTION_MS = 5000;
+
+/**
+ * Emitted (in addition to the go-librespot event types) after the socket has
+ * SUCCESSFULLY re-opened following a drop — never on the very first connect.
+ * Consumers use it to re-query GET /status and reconcile any track-end that was
+ * emitted by go-librespot during the WS-down window (R4-3).
+ */
+export type GoLibrespotSyntheticEvent = "reconnected";
+
+export class GoLibrespotEventClient extends EventEmitter {
+  private wsUrl: string;
+  private WebSocketCtor: WebSocketCtor;
+  private ws: WsLike | null = null;
+  private stopped = false;
+  private reconnectDelay = INITIAL_RECONNECT_MS;
+  private reconnectTimer: ReturnType<typeof setTimeout> | null = null;
+  // R4-3: false until the FIRST successful open. A later open is therefore a
+  // reconnect and warrants a "reconnected" re-sync signal.
+  private hasConnected = false;
+  // R4-5: fires STABLE_CONNECTION_MS after an open; only then is the backoff reset.
+  private stableTimer: ReturnType<typeof setTimeout> | null = null;
+
+  constructor(wsUrl: string, deps?: { WebSocketCtor?: WebSocketCtor }) {
+    super();
+    this.wsUrl = wsUrl;
+    this.WebSocketCtor = deps?.WebSocketCtor ?? (WebSocket as unknown as WebSocketCtor);
+  }
+
+  start(): void {
+    this.stopped = false;
+    this.connect();
+  }
+
+  stop(): void {
+    this.stopped = true;
+    this.clearStableTimer();
+    if (this.reconnectTimer) {
+      clearTimeout(this.reconnectTimer);
+      this.reconnectTimer = null;
+    }
+    if (this.ws) {
+      this.ws.close();
+      this.ws = null;
+    }
+  }
+
+  private connect(): void {
+    if (this.stopped) return;
+    const ws = new this.WebSocketCtor(this.wsUrl);
+    this.ws = ws;
+    ws.on("open", () => this.onOpen());
+    ws.on("message", (buf: unknown) => this.handleMessage(buf));
+    ws.on("close", () => {
+      this.ws = null;
+      // R4-5: the connection is gone — cancel the pending stability reset so a
+      // short-lived (flapping) socket never resets the backoff.
+      this.clearStableTimer();
+      this.scheduleReconnect();
+    });
+    ws.on("error", (err: unknown) => {
+      if (this.listenerCount("error") > 0) this.emit("error", err);
+    });
+  }
+
+  private onOpen(): void {
+    // R4-3: only a RE-open (a socket that had connected before, then dropped)
+    // needs reconciliation; the initial connect has nothing to catch up on.
+    const isReconnect = this.hasConnected;
+    this.hasConnected = true;
+    // R4-5: do NOT reset the backoff here. Arm a timer that resets it only once
+    // the connection has stayed up for STABLE_CONNECTION_MS; a flap that closes
+    // before then leaves the exponential backoff to keep growing.
+    this.armStableTimer();
+    if (isReconnect) this.emit("reconnected");
+  }
+
+  private armStableTimer(): void {
+    this.clearStableTimer();
+    this.stableTimer = setTimeout(() => {
+      this.stableTimer = null;
+      this.reconnectDelay = INITIAL_RECONNECT_MS;
+    }, STABLE_CONNECTION_MS);
+    (this.stableTimer as { unref?: () => void }).unref?.();
+  }
+
+  private clearStableTimer(): void {
+    if (this.stableTimer) {
+      clearTimeout(this.stableTimer);
+      this.stableTimer = null;
+    }
+  }
+
+  private handleMessage(buf: unknown): void {
+    let parsed: unknown;
+    try {
+      const text = Buffer.isBuffer(buf)
+        ? buf.toString("utf8")
+        : typeof buf === "string"
+          ? buf
+          : String(buf);
+      parsed = JSON.parse(text);
+    } catch {
+      return;
+    }
+    if (parsed && typeof (parsed as any).type === "string") {
+      this.emit((parsed as any).type, (parsed as any).data ?? {});
+    }
+  }
+
+  private scheduleReconnect(): void {
+    if (this.stopped || this.reconnectTimer) return;
+    const delay = this.reconnectDelay;
+    this.reconnectDelay = Math.min(delay * 2, MAX_RECONNECT_MS);
+    this.reconnectTimer = setTimeout(() => {
+      this.reconnectTimer = null;
+      this.connect();
+    }, delay);
+  }
+}

src/music/spotify/go-librespot-config.test.ts

@@ -0,0 +1,119 @@
+// src/music/spotify/go-librespot-config.test.ts
+import { describe, it, expect } from "vitest";
+import { renderConfigYml, type GoLibrespotConfigOptions } from "./go-librespot-config.js";
+
+const OPTS: GoLibrespotConfigOptions = {
+  deviceName: "TeamSpeak Music Bot",
+  bitrate: 320,
+  fifoPath: "/tmp/go-librespot.fifo",
+  apiAddress: "0.0.0.0",
+  apiPort: 3678,
+  callbackPort: 8080,
+};
+
+/**
+ * Minimal 2-level YAML reader for the exact shape renderConfigYml emits
+ * (flat scalars + one level of nesting under `server:` / `credentials:`).
+ * Avoids adding a yaml dependency while still proving the output round-trips.
+ */
+function parseTinyYaml(src: string): Record<string, unknown> {
+  const root: Record<string, unknown> = {};
+  const stack: Array<{ indent: number; obj: Record<string, unknown> }> = [
+    { indent: -1, obj: root },
+  ];
+  for (const rawLine of src.split("\n")) {
+    if (rawLine.trim() === "") continue;
+    const indent = rawLine.length - rawLine.trimStart().length;
+    const line = rawLine.trim();
+    const idx = line.indexOf(":");
+    const key = line.slice(0, idx).trim();
+    let valRaw = line.slice(idx + 1).trim();
+    while (stack.length > 1 && indent <= stack[stack.length - 1].indent) {
+      stack.pop();
+    }
+    const parent = stack[stack.length - 1].obj;
+    if (valRaw === "") {
+      const child: Record<string, unknown> = {};
+      parent[key] = child;
+      stack.push({ indent, obj: child });
+      continue;
+    }
+    let val: unknown = valRaw;
+    if (valRaw.startsWith('"') && valRaw.endsWith('"')) val = JSON.parse(valRaw);
+    else if (valRaw === "true") val = true;
+    else if (valRaw === "false") val = false;
+    else if (/^-?\d+$/.test(valRaw)) val = Number(valRaw);
+    parent[key] = val;
+  }
+  return root;
+}
+
+describe("renderConfigYml", () => {
+  it("emits the exact top-level go-librespot keys/values", () => {
+    const lines = renderConfigYml(OPTS).split("\n");
+    expect(lines).toContain('device_name: "TeamSpeak Music Bot"');
+    expect(lines).toContain("device_type: computer");
+    expect(lines).toContain("bitrate: 320");
+    expect(lines).toContain("audio_backend: pipe");
+    expect(lines).toContain("audio_output_pipe: /tmp/go-librespot.fifo");
+    expect(lines).toContain("audio_output_pipe_format: s16le");
+  });
+
+  it("emits a server block with enabled/address/port set explicitly", () => {
+    const parsed = parseTinyYaml(renderConfigYml(OPTS));
+    expect(parsed.server).toEqual({
+      enabled: true,
+      address: "0.0.0.0",
+      port: 3678,
+    });
+  });
+
+  it("emits interactive OAuth credentials with the callback port", () => {
+    const parsed = parseTinyYaml(renderConfigYml(OPTS));
+    expect(parsed.credentials).toEqual({
+      type: "interactive",
+      interactive: { callback_port: 8080 },
+    });
+  });
+
+  it("full round-trip reflects every provided option", () => {
+    const parsed = parseTinyYaml(renderConfigYml(OPTS));
+    expect(parsed).toEqual({
+      device_name: "TeamSpeak Music Bot",
+      device_type: "computer",
+      bitrate: 320,
+      audio_backend: "pipe",
+      audio_output_pipe: "/tmp/go-librespot.fifo",
+      audio_output_pipe_format: "s16le",
+      server: { enabled: true, address: "0.0.0.0", port: 3678 },
+      credentials: { type: "interactive", interactive: { callback_port: 8080 } },
+    });
+  });
+
+  it("threads distinct option values through unchanged (no hard-coded ports)", () => {
+    const parsed = parseTinyYaml(
+      renderConfigYml({
+        deviceName: "Other Bot",
+        bitrate: 160,
+        fifoPath: "/run/librespot/pipe",
+        apiAddress: "127.0.0.1",
+        apiPort: 4000,
+        callbackPort: 9099,
+      }),
+    );
+    expect(parsed).toMatchObject({
+      device_name: "Other Bot",
+      bitrate: 160,
+      audio_output_pipe: "/run/librespot/pipe",
+      server: { address: "127.0.0.1", port: 4000 },
+      credentials: { interactive: { callback_port: 9099 } },
+    });
+  });
+
+  it("safely quotes device names containing special characters", () => {
+    const yml = renderConfigYml({ ...OPTS, deviceName: 'My "Cool" Bot' });
+    expect(yml.split("\n")).toContain('device_name: "My \\"Cool\\" Bot"');
+    // and still round-trips back to the original string
+    expect(parseTinyYaml(yml).device_name).toBe('My "Cool" Bot');
+  });
+});

src/music/spotify/go-librespot-config.ts

@@ -0,0 +1,42 @@
+// src/music/spotify/go-librespot-config.ts
+// Hand-built go-librespot config.yml. Keys/values verified against
+// devgianlu/go-librespot cmd/daemon/cli_config.go koanf tags. No yaml
+// dependency is used; the file is a small, fixed-shape document.
+
+export interface GoLibrespotConfigOptions {
+  deviceName: string;
+  bitrate: number;
+  fifoPath: string;
+  apiAddress: string;
+  apiPort: number;
+  callbackPort: number;
+}
+
+/**
+ * Render a headless go-librespot config.yml:
+ *  - pipe audio backend writing raw 44.1kHz/s16le stereo PCM to a FIFO,
+ *  - HTTP+WebSocket control server enabled (port has NO built-in default,
+ *    so it is always written explicitly),
+ *  - interactive OAuth credentials (persisted automatically to
+ *    <config_dir>/credentials.json after first login).
+ */
+export function renderConfigYml(o: GoLibrespotConfigOptions): string {
+  return (
+    [
+      `device_name: ${JSON.stringify(o.deviceName)}`,
+      `device_type: computer`,
+      `bitrate: ${o.bitrate}`,
+      `audio_backend: pipe`,
+      `audio_output_pipe: ${o.fifoPath}`,
+      `audio_output_pipe_format: s16le`,
+      `server:`,
+      `  enabled: true`,
+      `  address: ${o.apiAddress}`,
+      `  port: ${o.apiPort}`,
+      `credentials:`,
+      `  type: interactive`,
+      `  interactive:`,
+      `    callback_port: ${o.callbackPort}`,
+    ].join("\n") + "\n"
+  );
+}

src/music/spotify/go-librespot.test.ts

@@ -0,0 +1,411 @@
+import { describe, it, expect, vi } from "vitest";
+import { EventEmitter } from "node:events";
+import { PassThrough } from "node:stream";
+import pino from "pino";
+import { GoLibrespotBackend } from "./go-librespot.js";
+
+const log = pino({ level: "silent" });
+
+/** A minimal stand-in for a spawned ChildProcess with real Readable stdout/stderr. */
+function makeFakeChild() {
+  const child: any = new EventEmitter();
+  child.stdout = new PassThrough();
+  child.stderr = new PassThrough();
+  child.kill = vi.fn();
+  return child;
+}
+
+function makeHarness(portOpts: { apiPort?: number; callbackPort?: number } = {}) {
+  const calls: string[] = [];
+  const ffmpegChild = makeFakeChild();
+  const gliChild = makeFakeChild();
+
+  const spawn = vi.fn((cmd: string, ..._rest: any[]) => {
+    const isGli = cmd.includes("go-librespot");
+    calls.push(`spawn:${isGli ? "go-librespot" : cmd}`);
+    return isGli ? gliChild : ffmpegChild;
+  });
+  const execFileSync = vi.fn((cmd: string) => {
+    calls.push(`exec:${cmd}`);
+    return Buffer.from("");
+  });
+  const writeFileSync = vi.fn(() => calls.push("write:config"));
+  const mkdirSync = vi.fn();
+  const unlinkSync = vi.fn(() => calls.push("unlink:fifo"));
+  const existsSync = vi.fn(() => false);
+
+  const rest = {
+    ping: vi.fn(async () => true),
+    playTrack: vi.fn(async () => {}),
+    pause: vi.fn(async () => {}),
+    resume: vi.fn(async () => {}),
+    stop: vi.fn(async () => {}),
+    seek: vi.fn(async () => {}),
+    getStatus: vi.fn(async () => null),
+  };
+  const events: any = new EventEmitter();
+  events.start = vi.fn(() => calls.push("ws:start"));
+  events.stop = vi.fn();
+
+  const backend = new GoLibrespotBackend({
+    deviceName: "Test Bot",
+    bitrate: 320,
+    workDir: "/tmp/work",
+    configDir: "/tmp/cfg",
+    apiPort: portOpts.apiPort ?? 3678,
+    callbackPort: portOpts.callbackPort,
+    logger: log,
+    deps: {
+      spawn,
+      execFileSync,
+      writeFileSync,
+      mkdirSync,
+      unlinkSync,
+      existsSync,
+      // C1: pin the ffmpeg command so the arg-array/order assertions below stay
+      // stable while production resolves ffmpeg via getFfmpegCommand() (which
+      // falls back to bundled ffmpeg-static when `ffmpeg` isn't on PATH).
+      ffmpegCommand: "ffmpeg",
+      findBinary: () => "/bin/go-librespot",
+      makeRest: () => rest,
+      makeEvents: () => events,
+      sleep: async () => {},
+      pollIntervalMs: 1,
+      pollTimeoutMs: 100,
+    } as any,
+  });
+
+  return { backend, calls, spawn, execFileSync, writeFileSync, existsSync, unlinkSync, rest, events, ffmpegChild, gliChild };
+}
+
+describe("GoLibrespotBackend.start", () => {
+  it("creates the FIFO with mkfifo before spawning ffmpeg, and spawns ffmpeg BEFORE go-librespot", async () => {
+    const h = makeHarness();
+    await h.backend.start();
+
+    expect(h.execFileSync).toHaveBeenCalledWith("mkfifo", ["/tmp/work/go-librespot.fifo"]);
+    expect(h.writeFileSync).toHaveBeenCalled();
+
+    const mkfifoIdx = h.calls.indexOf("exec:mkfifo");
+    const ffmpegIdx = h.calls.indexOf("spawn:ffmpeg");
+    const gliIdx = h.calls.indexOf("spawn:go-librespot");
+    expect(mkfifoIdx).toBeGreaterThanOrEqual(0);
+    expect(ffmpegIdx).toBeGreaterThan(mkfifoIdx); // ffmpeg attaches to the FIFO first
+    expect(gliIdx).toBeGreaterThan(ffmpegIdx);     // then the writer (go-librespot)
+    expect(h.calls.indexOf("ws:start")).toBeGreaterThan(gliIdx); // WS connects last
+  });
+
+  it("passes --config_dir to go-librespot using the resolved binary path", async () => {
+    const h = makeHarness();
+    await h.backend.start();
+    expect(h.spawn).toHaveBeenCalledWith(
+      "/bin/go-librespot",
+      ["--config_dir", "/tmp/cfg"],
+      expect.anything(),
+    );
+  });
+
+  it("uses the 44100->48000 s16le ffmpeg command reading the FIFO", async () => {
+    const h = makeHarness();
+    await h.backend.start();
+    const ffmpegArgs = h.spawn.mock.calls.find((c) => c[0] === "ffmpeg")![1] as string[];
+    expect(ffmpegArgs).toEqual([
+      "-hide_banner", "-loglevel", "error",
+      "-f", "s16le", "-ar", "44100", "-ac", "2", "-i", "/tmp/work/go-librespot.fifo",
+      "-f", "s16le", "-ar", "48000", "-ac", "2", "-acodec", "pcm_s16le", "pipe:1",
+    ]);
+  });
+
+  it("emits 'ready' and reports isReady() true once the REST ping succeeds", async () => {
+    const h = makeHarness();
+    const ready = vi.fn();
+    h.backend.on("ready", ready);
+    await h.backend.start();
+    expect(h.rest.ping).toHaveBeenCalled();
+    expect(ready).toHaveBeenCalledTimes(1);
+    expect(h.backend.isReady()).toBe(true);
+  });
+
+  it("keeps polling ping() until it returns true", async () => {
+    const h = makeHarness();
+    h.rest.ping.mockResolvedValueOnce(false).mockResolvedValueOnce(false).mockResolvedValue(true);
+    await h.backend.start();
+    expect(h.rest.ping).toHaveBeenCalledTimes(3);
+    expect(h.backend.isReady()).toBe(true);
+  });
+});
+
+describe("GoLibrespotBackend config binding (Fix 1 loopback + Fix 3 ports)", () => {
+  function writtenYml(h: ReturnType<typeof makeHarness>): string {
+    const calls = h.writeFileSync.mock.calls as unknown as any[][];
+    const call = calls.find((c) => String(c[0]).endsWith("config.yml"));
+    expect(call).toBeDefined();
+    return call![1] as string;
+  }
+
+  it("binds the control API to loopback (127.0.0.1), never 0.0.0.0", async () => {
+    const h = makeHarness();
+    await h.backend.start();
+    const yml = writtenYml(h);
+    expect(yml).toContain("address: 127.0.0.1");
+    expect(yml).not.toContain("0.0.0.0");
+  });
+
+  it("threads apiPort + callbackPort into the rendered config", async () => {
+    const h = makeHarness({ apiPort: 3712, callbackPort: 8712 });
+    await h.backend.start();
+    const yml = writtenYml(h);
+    expect(yml).toContain("port: 3712");
+    expect(yml).toContain("callback_port: 8712");
+  });
+
+  it("defaults callbackPort to 8080 when unset", async () => {
+    const h = makeHarness();
+    await h.backend.start();
+    expect(writtenYml(h)).toContain("callback_port: 8080");
+  });
+});
+
+describe("GoLibrespotBackend WebSocket event mapping", () => {
+  it("maps a not_playing event to trackEnded{reason:'ended'}", async () => {
+    const h = makeHarness();
+    await h.backend.start();
+    const ended = vi.fn();
+    h.backend.on("trackEnded", ended);
+    h.events.emit("not_playing", { uri: "spotify:track:abc" });
+    expect(ended).toHaveBeenCalledWith({ uri: "spotify:track:abc", reason: "ended" });
+  });
+
+  it("maps a stopped event to trackEnded{reason:'stopped'}", async () => {
+    const h = makeHarness();
+    await h.backend.start();
+    const ended = vi.fn();
+    h.backend.on("trackEnded", ended);
+    h.events.emit("stopped", { uri: "spotify:track:xyz" });
+    expect(ended).toHaveBeenCalledWith({ uri: "spotify:track:xyz", reason: "stopped" });
+  });
+
+  it("maps a metadata event to a SpotifyNowPlaying and updates getPositionMs()", async () => {
+    const h = makeHarness();
+    await h.backend.start();
+    const meta = vi.fn();
+    h.backend.on("metadata", meta);
+    h.events.emit("metadata", {
+      uri: "spotify:track:abc",
+      name: "Song",
+      artist_names: ["A", "B"],
+      album_name: "Alb",
+      album_cover_url: "http://x/y.jpg",
+      position: 1234,
+      duration: 200000,
+    });
+    expect(meta).toHaveBeenCalledWith({
+      uri: "spotify:track:abc",
+      name: "Song",
+      artist: "A, B",
+      album: "Alb",
+      coverUrl: "http://x/y.jpg",
+      durationMs: 200000,
+    });
+    expect(h.backend.getPositionMs()).toBe(1234);
+  });
+});
+
+describe("GoLibrespotBackend transport delegation + PCM", () => {
+  it("playTrack delegates to the REST client", async () => {
+    const h = makeHarness();
+    await h.backend.start();
+    await h.backend.playTrack("spotify:track:go");
+    expect(h.rest.playTrack).toHaveBeenCalledWith("spotify:track:go");
+  });
+
+  it("pause/resume/seek delegate to the REST client and seek updates position", async () => {
+    const h = makeHarness();
+    await h.backend.start();
+    await h.backend.pause();
+    await h.backend.resume();
+    await h.backend.seek(5000);
+    expect(h.rest.pause).toHaveBeenCalled();
+    expect(h.rest.resume).toHaveBeenCalled();
+    expect(h.rest.seek).toHaveBeenCalledWith(5000);
+    expect(h.backend.getPositionMs()).toBe(5000);
+  });
+
+  it("getPcmStream() returns the ffmpeg stdout Readable", async () => {
+    const h = makeHarness();
+    await h.backend.start();
+    expect(h.backend.getPcmStream()).toBe(h.ffmpegChild.stdout);
+  });
+});
+
+describe("GoLibrespotBackend.stop", () => {
+  it("kills ffmpeg + go-librespot, stops the WS, removes the FIFO, and clears ready", async () => {
+    const h = makeHarness();
+    await h.backend.start();
+    h.existsSync.mockReturnValue(true); // FIFO now present, so stop() unlinks it
+    h.backend.stop();
+    expect(h.ffmpegChild.kill).toHaveBeenCalled();
+    expect(h.gliChild.kill).toHaveBeenCalled();
+    expect(h.events.stop).toHaveBeenCalled();
+    expect(h.unlinkSync).toHaveBeenCalledWith("/tmp/work/go-librespot.fifo");
+    expect(h.backend.isReady()).toBe(false);
+  });
+});
+
+describe("GoLibrespotBackend.start failure cleanup", () => {
+  it("tears down ffmpeg, go-librespot, and the FIFO when readiness polling never succeeds", async () => {
+    const h = makeHarness();
+    // ping() never returns true → waitUntilReady() times out → start() rejects
+    // AFTER both processes were spawned and the FIFO was created.
+    h.rest.ping.mockResolvedValue(false);
+    // FIFO present so the cleanup path unlinks it.
+    h.existsSync.mockReturnValue(true);
+
+    await expect(h.backend.start()).rejects.toThrow(/did not become ready/);
+
+    expect(h.ffmpegChild.kill).toHaveBeenCalled(); // ffmpeg killed on failed startup
+    expect(h.gliChild.kill).toHaveBeenCalled(); // go-librespot killed on failed startup
+    expect(h.unlinkSync).toHaveBeenCalledWith("/tmp/work/go-librespot.fifo"); // FIFO removed
+    expect(h.backend.isReady()).toBe(false);
+  });
+});
+
+describe("GoLibrespotBackend child-process error handling", () => {
+  it("does not throw when a child 'error' is emitted with no backend 'error' listener attached", async () => {
+    const h = makeHarness();
+    await h.backend.start();
+    // No "error" listener on the backend: an unhandled 'error' event would crash
+    // Node, so the backend must swallow+log it instead of re-emitting.
+    expect(h.backend.listenerCount("error")).toBe(0);
+    expect(() => h.ffmpegChild.emit("error", new Error("ffmpeg boom"))).not.toThrow();
+    expect(() => h.gliChild.emit("error", new Error("gli boom"))).not.toThrow();
+  });
+
+  it("re-emits a child 'error' to an attached backend 'error' listener", async () => {
+    const h = makeHarness();
+    await h.backend.start();
+    const onErr = vi.fn();
+    h.backend.on("error", onErr);
+    const err = new Error("ffmpeg boom");
+    h.ffmpegChild.emit("error", err);
+    expect(onErr).toHaveBeenCalledWith(err);
+  });
+});
+
+// Let queued microtasks (the async reconnect re-sync) settle.
+const flush = () => new Promise<void>((r) => setTimeout(r, 0));
+
+describe("GoLibrespotBackend R4-2: unexpected sidecar exit recovery", () => {
+  it("degrades to trackEnded{reason:'error'}, surfaces 'error', and stops the WS on an UNEXPECTED exit", async () => {
+    const h = makeHarness();
+    await h.backend.start();
+    await h.backend.playTrack("spotify:track:cur"); // sets the current uri
+
+    const ended = vi.fn();
+    const onErr = vi.fn();
+    h.backend.on("trackEnded", ended);
+    h.backend.on("error", onErr);
+
+    // Sidecar dies under us (nonzero exit, no stop() from us).
+    h.gliChild.emit("exit", 1, null);
+
+    expect(ended).toHaveBeenCalledWith({ uri: "spotify:track:cur", reason: "error" });
+    expect(onErr).toHaveBeenCalledTimes(1); // controller told -> rebuilds on next ensureStarted
+    expect(h.events.stop).toHaveBeenCalled(); // WS reconnect loop stopped (no dead-port hammer)
+    expect(h.backend.isReady()).toBe(false);
+  });
+
+  it("emits trackEnded BEFORE error so a listener that tears down still receives the skip", async () => {
+    const h = makeHarness();
+    await h.backend.start();
+    await h.backend.playTrack("spotify:track:cur");
+
+    const order: string[] = [];
+    h.backend.on("trackEnded", () => order.push("trackEnded"));
+    h.backend.on("error", () => order.push("error"));
+    h.gliChild.emit("exit", null, "SIGKILL");
+
+    expect(order).toEqual(["trackEnded", "error"]);
+  });
+
+  it("a stop()-initiated exit emits NEITHER trackEnded NOR error", async () => {
+    const h = makeHarness();
+    await h.backend.start();
+    await h.backend.playTrack("spotify:track:cur");
+
+    const ended = vi.fn();
+    const onErr = vi.fn();
+    h.backend.on("trackEnded", ended);
+    h.backend.on("error", onErr);
+
+    h.backend.stop(); // intentional teardown -> the ensuing 'exit' must be silent
+    h.gliChild.emit("exit", 0, "SIGTERM");
+
+    expect(ended).not.toHaveBeenCalled();
+    expect(onErr).not.toHaveBeenCalled();
+  });
+});
+
+describe("GoLibrespotBackend R4-3: WS reconnect re-sync", () => {
+  const notPlaying = { stopped: true, paused: false, buffering: false, track: null };
+  const stillPlaying = {
+    stopped: false,
+    paused: false,
+    buffering: false,
+    track: {
+      uri: "spotify:track:cur",
+      name: "Song",
+      artist_names: ["A"],
+      album_name: "Alb",
+      album_cover_url: null,
+      position: 1000,
+      duration: 200000,
+    },
+  };
+
+  it("re-queries GET /status on reconnect and emits trackEnded when playback is no longer active", async () => {
+    const h = makeHarness();
+    await h.backend.start();
+    await h.backend.playTrack("spotify:track:cur");
+    h.rest.getStatus.mockResolvedValue(notPlaying as any);
+
+    const ended = vi.fn();
+    h.backend.on("trackEnded", ended);
+    h.events.emit("reconnected");
+    await flush();
+
+    expect(h.rest.getStatus).toHaveBeenCalled();
+    expect(ended).toHaveBeenCalledWith({ uri: "spotify:track:cur", reason: "ended" });
+  });
+
+  it("does NOT emit a spurious trackEnded on reconnect when status shows still-playing", async () => {
+    const h = makeHarness();
+    await h.backend.start();
+    await h.backend.playTrack("spotify:track:cur");
+    h.rest.getStatus.mockResolvedValue(stillPlaying as any);
+
+    const ended = vi.fn();
+    h.backend.on("trackEnded", ended);
+    h.events.emit("reconnected");
+    await flush();
+
+    expect(h.rest.getStatus).toHaveBeenCalled();
+    expect(ended).not.toHaveBeenCalled();
+  });
+
+  it("re-sync is idempotent: a reconnect then a live not_playing emits trackEnded only once", async () => {
+    const h = makeHarness();
+    await h.backend.start();
+    await h.backend.playTrack("spotify:track:cur");
+    h.rest.getStatus.mockResolvedValue(notPlaying as any);
+
+    const ended = vi.fn();
+    h.backend.on("trackEnded", ended);
+    h.events.emit("reconnected");
+    await flush();
+    // A duplicate live event for the same track must not double-advance the queue.
+    h.events.emit("not_playing", { uri: "spotify:track:cur" });
+
+    expect(ended).toHaveBeenCalledTimes(1);
+  });
+});

src/music/spotify/go-librespot.ts

@@ -0,0 +1,402 @@
+import { EventEmitter } from "node:events";
+// The go-librespot sidecar is Linux/Docker-gated (mkfifo + Linux-only binary),
+// so the FIFO and config-dir paths are ALWAYS POSIX. Use posix.join so the
+// separators are correct on the Linux target regardless of the host OS.
+import { posix as posixPath } from "node:path";
+import type { Readable } from "node:stream";
+import type { ChildProcess } from "node:child_process";
+import {
+  execFileSync as realExecFileSync,
+  spawn as realSpawn,
+} from "node:child_process";
+import {
+  existsSync as realExistsSync,
+  mkdirSync as realMkdirSync,
+  unlinkSync as realUnlinkSync,
+  writeFileSync as realWriteFileSync,
+} from "node:fs";
+import type { Logger } from "pino";
+import type {
+  SpotifyAudioBackend,
+  SpotifyTrackEndedEvent,
+  SpotifyNowPlaying,
+} from "./backend.js";
+import { findGoLibrespot } from "./binary.js";
+import { renderConfigYml } from "./go-librespot-config.js";
+import { GoLibrespotRestClient, GoLibrespotEventClient } from "./go-librespot-api.js";
+import { getFfmpegCommand } from "../../audio/player.js";
+
+export interface GoLibrespotBackendOptions {
+  deviceName: string;
+  bitrate: number;
+  workDir: string;
+  configDir: string;
+  apiPort?: number;
+  callbackPort?: number;
+  logger: Logger;
+  deps?: GoLibrespotBackendDeps;
+}
+
+/** Injectable seams so the whole lifecycle is testable without a real binary/FIFO/network. */
+export interface GoLibrespotBackendDeps {
+  spawn?: typeof realSpawn;
+  execFileSync?: typeof realExecFileSync;
+  existsSync?: typeof realExistsSync;
+  mkdirSync?: typeof realMkdirSync;
+  unlinkSync?: typeof realUnlinkSync;
+  writeFileSync?: typeof realWriteFileSync;
+  findBinary?: () => string;
+  /**
+   * C1: override the ffmpeg command. Production resolves it via
+   * getFfmpegCommand() (bundled ffmpeg-static fallback when `ffmpeg` isn't on
+   * PATH, the Docker case); tests pin it to "ffmpeg" for stable arg assertions.
+   */
+  ffmpegCommand?: string;
+  makeRest?: (baseUrl: string) => GoLibrespotRestClient;
+  makeEvents?: (wsUrl: string) => GoLibrespotEventClient;
+  sleep?: (ms: number) => Promise<void>;
+  pollIntervalMs?: number;
+  pollTimeoutMs?: number;
+}
+
+const DEFAULT_API_PORT = 3678;
+const DEFAULT_CALLBACK_PORT = 8080;
+const FIFO_NAME = "go-librespot.fifo";
+
+export class GoLibrespotBackend extends EventEmitter implements SpotifyAudioBackend {
+  private readonly opts: GoLibrespotBackendOptions;
+  private readonly log: Logger;
+  private readonly deps: GoLibrespotBackendDeps;
+  private readonly apiPort: number;
+  private readonly callbackPort: number;
+  private readonly fifoPath: string;
+
+  private ffmpeg: ChildProcess | null = null;
+  private proc: ChildProcess | null = null;
+  private rest: GoLibrespotRestClient | null = null;
+  private events: GoLibrespotEventClient | null = null;
+  private ready = false;
+  private positionMs = 0;
+  // R4-2: distinguishes an INTENTIONAL teardown (stop()/failed start()) — where a
+  // sidecar exit is expected and must be silent — from an UNEXPECTED death that
+  // must degrade-to-skip + surface an error so the controller relaunches.
+  private stopping = false;
+  // The uri of the track currently loaded in the sidecar (set by playTrack and
+  // refreshed from metadata). Used as the trackEnded uri on an unexpected death
+  // (R4-2) and on reconnect reconciliation (R4-3).
+  private currentUri = "";
+  // At-most-one trackEnded per track. Set when we emit a track-end, cleared when
+  // a new track begins. Keeps the reconnect re-sync (R4-3) from double-emitting
+  // with a live not_playing/stopped event.
+  private endLatched = false;
+
+  constructor(o: GoLibrespotBackendOptions) {
+    super();
+    this.opts = o;
+    this.log = o.logger;
+    this.deps = o.deps ?? {};
+    this.apiPort = o.apiPort ?? DEFAULT_API_PORT;
+    this.callbackPort = o.callbackPort ?? DEFAULT_CALLBACK_PORT;
+    this.fifoPath = posixPath.join(o.workDir, FIFO_NAME);
+  }
+
+  async start(): Promise<void> {
+    // Fresh lifecycle (also covers a start() after a previous stop() on the same
+    // instance): clear the teardown flag and per-track end state.
+    this.stopping = false;
+    this.currentUri = "";
+    this.endLatched = false;
+    const spawn = this.deps.spawn ?? realSpawn;
+    const execFileSync = this.deps.execFileSync ?? realExecFileSync;
+    const existsSync = this.deps.existsSync ?? realExistsSync;
+    const mkdirSync = this.deps.mkdirSync ?? realMkdirSync;
+    const unlinkSync = this.deps.unlinkSync ?? realUnlinkSync;
+    const writeFileSync = this.deps.writeFileSync ?? realWriteFileSync;
+    const findBinary = this.deps.findBinary ?? findGoLibrespot;
+    // C1: resolve ffmpeg via the repo's getFfmpegCommand() (ffmpeg-static
+    // fallback) unless a command is injected for tests.
+    const ffmpegCommand = this.deps.ffmpegCommand ?? getFfmpegCommand();
+
+    // 1. Ensure work + config directories exist.
+    mkdirSync(this.opts.workDir, { recursive: true });
+    mkdirSync(this.opts.configDir, { recursive: true });
+
+    // 2. (Re)create the FIFO — mkfifo fails if the path already exists.
+    if (existsSync(this.fifoPath)) unlinkSync(this.fifoPath);
+    execFileSync("mkfifo", [this.fifoPath]);
+
+    // Everything past this point spawns processes / opens sockets. If any step
+    // throws (e.g. the readiness poll times out), tear down whatever was already
+    // created via stop() (kill ffmpeg + go-librespot, close WS, remove FIFO) so
+    // we don't leak child processes or leave the FIFO on disk, then rethrow.
+    try {
+      // 3. Spawn ffmpeg FIRST so the PCM reader is attached to the FIFO before
+      //    go-librespot (the writer) starts pushing raw 44.1k s16le into it.
+      //    Opening the FIFO for writing before a reader exists errors with ENXIO.
+      this.ffmpeg = spawn(
+        ffmpegCommand,
+        [
+          "-hide_banner", "-loglevel", "error",
+          "-f", "s16le", "-ar", "44100", "-ac", "2", "-i", this.fifoPath,
+          "-f", "s16le", "-ar", "48000", "-ac", "2", "-acodec", "pcm_s16le", "pipe:1",
+        ],
+        { stdio: ["ignore", "pipe", "pipe"] },
+      );
+      this.ffmpeg.stderr?.on("data", (b: Buffer) =>
+        this.log.debug({ ffmpeg: b.toString().trim() }, "ffmpeg"),
+      );
+      this.ffmpeg.on("error", (err) => this.emitError(err));
+
+      // 4. Render + write config.yml into the config dir.
+      const yml = renderConfigYml({
+        deviceName: this.opts.deviceName,
+        bitrate: this.opts.bitrate,
+        fifoPath: this.fifoPath,
+        // The go-librespot control API is UNAUTHENTICATED and the client only
+        // ever connects via 127.0.0.1; the sidecar runs in the SAME container
+        // as the bot, so bind to loopback rather than exposing it on 0.0.0.0.
+        apiAddress: "127.0.0.1",
+        apiPort: this.apiPort,
+        callbackPort: this.callbackPort,
+      });
+      writeFileSync(posixPath.join(this.opts.configDir, "config.yml"), yml, "utf8");
+
+      // 5. Spawn go-librespot AFTER ffmpeg is listening on the FIFO. Its stdout/
+      //    stderr carry the interactive OAuth URL on first run — surface via logger.
+      const bin = findBinary();
+      this.proc = spawn(bin, ["--config_dir", this.opts.configDir], {
+        stdio: ["ignore", "pipe", "pipe"],
+      });
+      const onLog = (b: Buffer) => this.log.info({ golibrespot: b.toString().trim() }, "go-librespot");
+      this.proc.stdout?.on("data", onLog);
+      this.proc.stderr?.on("data", onLog);
+      this.proc.on("error", (err) => this.emitError(err));
+      this.proc.on("exit", (code, signal) => {
+        this.ready = false;
+        this.log.warn({ code, signal }, "go-librespot exited");
+        // R4-2: a stop()-initiated exit is expected — stay silent. Any other exit
+        // is the sidecar dying under us and must be recovered.
+        if (this.stopping) return;
+        this.onUnexpectedExit(code, signal);
+      });
+
+      // 6. REST client, then poll GET / until the HTTP server answers.
+      const baseUrl = `http://127.0.0.1:${this.apiPort}`;
+      this.rest = this.deps.makeRest
+        ? this.deps.makeRest(baseUrl)
+        : new GoLibrespotRestClient(baseUrl);
+      await this.waitUntilReady();
+
+      // 7. Connect the WebSocket event stream and wire event mapping.
+      const wsUrl = `ws://127.0.0.1:${this.apiPort}/events`;
+      this.events = this.deps.makeEvents
+        ? this.deps.makeEvents(wsUrl)
+        : new GoLibrespotEventClient(wsUrl);
+      this.wireEvents(this.events);
+      this.events.start();
+
+      this.ready = true;
+      this.emit("ready");
+    } catch (e) {
+      this.stop();
+      throw e;
+    }
+  }
+
+  /**
+   * Re-emit a child-process "error" only when a consumer is listening; Node
+   * throws on an unhandled "error" event (can crash the process), so with no
+   * listener we log via the injected logger instead. Mirrors the WS client's
+   * listenerCount("error") gate in go-librespot-api.ts.
+   */
+  private emitError(err: unknown): void {
+    if (this.listenerCount("error") > 0) {
+      this.emit("error", err);
+    } else {
+      this.log.error({ err }, "go-librespot backend error (no listener)");
+    }
+  }
+
+  /**
+   * At-most-one track-end per track. The WS not_playing/stopped events, the
+   * unexpected-death degrade (R4-2) and the reconnect re-sync (R4-3) all funnel
+   * through here so a track can only advance the queue once.
+   */
+  private emitTrackEnded(e: SpotifyTrackEndedEvent): void {
+    if (this.endLatched) return;
+    this.endLatched = true;
+    this.emit("trackEnded", e);
+  }
+
+  /**
+   * R4-2: the go-librespot sidecar died without a stop() from us. Spotify
+   * auto-advance is driven ONLY by the WS trackEnded event (the player-side stall
+   * watchdog is disabled in external mode), so a silent death would stall the
+   * queue forever. Mirror the Rust I4 degrade-to-skip:
+   *  (a) emit trackEnded{reason:"error"} so BotInstance advances the queue;
+   *  (b) stop the WS reconnect loop so it stops hammering the now-dead API port;
+   *  (c) surface via emitError so the controller tears down + relaunches a fresh
+   *      backend on the next ensureStarted().
+   * trackEnded MUST be emitted BEFORE emitError: the controller's error handler
+   * removeAllListeners() on teardown, so a trackEnded emitted after would be lost.
+   */
+  private onUnexpectedExit(code: number | null, signal: NodeJS.Signals | null): void {
+    // (b) Kill the reconnect loop first — the API port is dead.
+    try {
+      this.events?.stop();
+    } catch {
+      /* ignore */
+    }
+    this.events = null;
+    // (a) Degrade-to-skip only if a track was actually loaded; a death during
+    // startup with nothing playing has no queue item to advance.
+    if (this.currentUri) {
+      this.emitTrackEnded({ uri: this.currentUri, reason: "error" });
+    }
+    // (c) Surface so the controller rebuilds.
+    this.emitError(
+      new Error(
+        `go-librespot exited unexpectedly (code=${code ?? "null"}, signal=${signal ?? "null"})`,
+      ),
+    );
+  }
+
+  /**
+   * R4-3: the WS reconnected after a drop. go-librespot only pushes events (it is
+   * never polled after startup), so a not_playing/stopped emitted during the
+   * down window is lost and the queue would stall. Re-query GET /status and, if
+   * playback is no longer active (the track ended in the gap), emit trackEnded so
+   * the queue advances. Idempotent via the end-latch (no double-emit with a live
+   * event). Only fired on a real reconnect — never the initial connect.
+   */
+  private async reconcileAfterReconnect(): Promise<void> {
+    const rest = this.rest;
+    if (!rest) return;
+    const status = await rest.getStatus();
+    // Couldn't read status — don't guess a track-end.
+    if (!status) return;
+    const active = status.track != null && !status.stopped;
+    if (!active) {
+      this.emitTrackEnded({ uri: this.currentUri, reason: "ended" });
+    }
+  }
+
+  private async waitUntilReady(): Promise<void> {
+    const sleep = this.deps.sleep ?? ((ms: number) => new Promise<void>((r) => setTimeout(r, ms)));
+    const interval = this.deps.pollIntervalMs ?? 200;
+    const timeout = this.deps.pollTimeoutMs ?? 15_000;
+    const deadline = Date.now() + timeout;
+    while (Date.now() < deadline) {
+      if (this.rest && (await this.rest.ping())) return;
+      await sleep(interval);
+    }
+    throw new Error("go-librespot API did not become ready within timeout");
+  }
+
+  private wireEvents(ev: GoLibrespotEventClient): void {
+    ev.on("metadata", (d: any) => {
+      const np: SpotifyNowPlaying = {
+        uri: typeof d?.uri === "string" ? d.uri : "",
+        name: typeof d?.name === "string" ? d.name : "",
+        artist: Array.isArray(d?.artist_names) ? d.artist_names.join(", ") : "",
+        album: typeof d?.album_name === "string" ? d.album_name : "",
+        coverUrl: typeof d?.album_cover_url === "string" ? d.album_cover_url : "",
+        durationMs: typeof d?.duration === "number" ? d.duration : 0,
+      };
+      if (typeof d?.position === "number") this.positionMs = d.position;
+      // A new track is now playing: remember it (for R4-2/R4-3) and clear the
+      // per-track end-latch so its eventual end can advance the queue.
+      if (np.uri && np.uri !== this.currentUri) {
+        this.currentUri = np.uri;
+        this.endLatched = false;
+      }
+      this.emit("metadata", np);
+    });
+    ev.on("seek", (d: any) => {
+      if (typeof d?.position === "number") this.positionMs = d.position;
+    });
+    ev.on("not_playing", (d: any) => {
+      this.emitTrackEnded({ uri: typeof d?.uri === "string" ? d.uri : "", reason: "ended" });
+    });
+    ev.on("stopped", (d: any) => {
+      this.emitTrackEnded({ uri: typeof d?.uri === "string" ? d.uri : "", reason: "stopped" });
+    });
+    // R4-3: reconcile any track-end missed while the WS was down.
+    ev.on("reconnected", () => {
+      void this.reconcileAfterReconnect();
+    });
+  }
+
+  isReady(): boolean {
+    return this.ready;
+  }
+
+  async playTrack(uri: string): Promise<void> {
+    if (!this.rest) throw new Error("go-librespot backend not started");
+    // Track what is loaded so an unexpected death (R4-2) / reconnect re-sync
+    // (R4-3) can advance the queue for the right uri, and reset the end-latch.
+    this.currentUri = uri;
+    this.endLatched = false;
+    await this.rest.playTrack(uri);
+  }
+
+  async pause(): Promise<void> {
+    if (this.rest) await this.rest.pause();
+  }
+
+  async resume(): Promise<void> {
+    if (this.rest) await this.rest.resume();
+  }
+
+  async seek(ms: number): Promise<void> {
+    if (this.rest) await this.rest.seek(ms);
+    this.positionMs = ms;
+  }
+
+  getPcmStream(): Readable {
+    const out = this.ffmpeg?.stdout;
+    if (!out) throw new Error("PCM stream unavailable (go-librespot backend not started)");
+    return out;
+  }
+
+  getPositionMs(): number {
+    return this.positionMs;
+  }
+
+  stop(): void {
+    // R4-2: mark this an INTENTIONAL teardown so the go-librespot 'exit' handler
+    // (fired by the SIGTERM below) stays silent instead of degrading-to-skip.
+    this.stopping = true;
+    this.ready = false;
+    try {
+      this.events?.stop();
+    } catch {
+      /* ignore */
+    }
+    this.events = null;
+    this.rest = null;
+    if (this.proc) {
+      try {
+        this.proc.kill("SIGTERM");
+      } catch {
+        /* ignore */
+      }
+      this.proc = null;
+    }
+    if (this.ffmpeg) {
+      try {
+        this.ffmpeg.kill("SIGTERM");
+      } catch {
+        /* ignore */
+      }
+      this.ffmpeg = null;
+    }
+    const existsSync = this.deps.existsSync ?? realExistsSync;
+    const unlinkSync = this.deps.unlinkSync ?? realUnlinkSync;
+    try {
+      if (existsSync(this.fifoPath)) unlinkSync(this.fifoPath);
+    } catch {
+      /* ignore */
+    }
+  }
+}

src/music/spotify/provider.test.ts

@@ -0,0 +1,63 @@
+import { describe, it, expect, vi } from "vitest";
+import { SpotifyProvider } from "./provider.js";
+import { SpotifyWebApi } from "./webapi.js";
+
+function fakeApi(over: Partial<SpotifyWebApi> = {}): SpotifyWebApi {
+  return {
+    hasCreds: () => true,
+    setCreds: vi.fn(),
+    search: vi.fn().mockResolvedValue({ songs: [], playlists: [], albums: [] }),
+    getTrack: vi.fn().mockResolvedValue(null),
+    getAlbumTracks: vi.fn().mockResolvedValue([]),
+    getPlaylistTracks: vi.fn().mockResolvedValue([]),
+    ...over,
+  } as unknown as SpotifyWebApi;
+}
+
+describe("SpotifyProvider", () => {
+  it("has platform 'spotify'", () => {
+    expect(new SpotifyProvider(fakeApi()).platform).toBe("spotify");
+  });
+
+  it("getSongUrl returns the spotify: sentinel, not a real URL", async () => {
+    const p = new SpotifyProvider(fakeApi());
+    const r = await p.getSongUrl("4iV5W9uYEdYUVa79Axb7Rh");
+    expect(r).toEqual({ url: "spotify:track:4iV5W9uYEdYUVa79Axb7Rh" });
+  });
+
+  it("search delegates to the web API", async () => {
+    const api = fakeApi({
+      search: vi.fn().mockResolvedValue({
+        songs: [{ id: "t1", platform: "spotify" }],
+        playlists: [],
+        albums: [],
+      }),
+    });
+    const out = await new SpotifyProvider(api).search("queen", 5);
+    expect(api.search).toHaveBeenCalledWith("queen", 5);
+    expect(out.songs[0].id).toBe("t1");
+  });
+
+  it("getAuthStatus reflects credential presence", async () => {
+    expect((await new SpotifyProvider(fakeApi({ hasCreds: () => true })).getAuthStatus()).loggedIn).toBe(true);
+    expect((await new SpotifyProvider(fakeApi({ hasCreds: () => false })).getAuthStatus()).loggedIn).toBe(false);
+  });
+
+  it("getPlaylistSongs / getAlbumSongs delegate to the web API", async () => {
+    const api = fakeApi({
+      getPlaylistTracks: vi.fn().mockResolvedValue([{ id: "p", platform: "spotify" }]),
+      getAlbumTracks: vi.fn().mockResolvedValue([{ id: "a", platform: "spotify" }]),
+    });
+    const p = new SpotifyProvider(api);
+    expect((await p.getPlaylistSongs("37i9"))[0].id).toBe("p");
+    expect((await p.getAlbumSongs("1abc"))[0].id).toBe("a");
+  });
+
+  it("no-op auth surfaces (QR expired, empty lyrics/recommend)", async () => {
+    const p = new SpotifyProvider(fakeApi());
+    expect(await p.getLyrics("x")).toEqual([]);
+    expect(await p.getRecommendPlaylists()).toEqual([]);
+    expect((await p.getQrCode()).key).toBe("");
+    expect(await p.checkQrCodeStatus("k")).toBe("expired");
+  });
+});

src/music/spotify/provider.ts

@@ -0,0 +1,86 @@
+import type {
+  MusicProvider,
+  Song,
+  SongUrlResult,
+  Playlist,
+  Album,
+  SearchResult,
+  LyricLine,
+  QrCodeResult,
+  AuthStatus,
+} from "../provider.js";
+import { SpotifyWebApi, type SpotifyCreds } from "./webapi.js";
+
+export class SpotifyProvider implements MusicProvider {
+  readonly platform = "spotify" as const;
+  private api: SpotifyWebApi;
+  private creds: SpotifyCreds = { clientId: "", clientSecret: "" };
+  private quality = "320";
+
+  constructor(api?: SpotifyWebApi) {
+    this.api = api ?? new SpotifyWebApi(() => this.creds);
+  }
+
+  setCreds(clientId: string, clientSecret: string): void {
+    this.creds = { clientId: clientId ?? "", clientSecret: clientSecret ?? "" };
+    this.api.setCreds(this.creds);
+  }
+
+  async search(query: string, limit = 20): Promise<SearchResult> {
+    return this.api.search(query, limit);
+  }
+
+  // Stage 1: return a sentinel URI. The play path recognizes `spotify:` and
+  // skips with a "not playable yet" message; real audio arrives in Stage 2/3.
+  async getSongUrl(songId: string): Promise<SongUrlResult | null> {
+    return { url: `spotify:track:${songId}` };
+  }
+
+  setQuality(quality: string): void {
+    this.quality = quality;
+  }
+  getQuality(): string {
+    return this.quality;
+  }
+
+  async getSongDetail(songId: string): Promise<Song | null> {
+    return this.api.getTrack(songId);
+  }
+
+  async getPlaylistSongs(playlistId: string): Promise<Song[]> {
+    return this.api.getPlaylistTracks(playlistId);
+  }
+
+  async getAlbumSongs(albumId: string): Promise<Song[]> {
+    return this.api.getAlbumTracks(albumId);
+  }
+
+  async getRecommendPlaylists(): Promise<Playlist[]> {
+    return [];
+  }
+
+  async getLyrics(_songId: string): Promise<LyricLine[]> {
+    return [];
+  }
+
+  async getQrCode(): Promise<QrCodeResult> {
+    return { qrUrl: "", key: "" };
+  }
+
+  async checkQrCodeStatus(
+    _key: string
+  ): Promise<"waiting" | "scanned" | "confirmed" | "expired"> {
+    return "expired";
+  }
+
+  setCookie(_cookie: string): void {}
+  getCookie(): string {
+    return "";
+  }
+
+  async getAuthStatus(): Promise<AuthStatus> {
+    return this.api.hasCreds()
+      ? { loggedIn: true, nickname: "Spotify" }
+      : { loggedIn: false, nickname: "Spotify (未配置 Client ID/Secret)" };
+  }
+}

src/music/spotify/rust-librespot.test.ts

@@ -0,0 +1,814 @@
+import { describe, it, expect, vi } from "vitest";
+import { EventEmitter } from "node:events";
+import { PassThrough } from "node:stream";
+import pino from "pino";
+import { RustLibrespotBackend, type RustLibrespotBackendDeps } from "./rust-librespot.js";
+
+const log = pino({ level: "silent" });
+
+/** ChildProcess stand-in with real Readable/Writable pipes so stdout->stdin piping works. */
+function makeFakeChild() {
+  const child: any = new EventEmitter();
+  child.stdout = new PassThrough();
+  child.stderr = new PassThrough();
+  child.stdin = new PassThrough();
+  child.kill = vi.fn();
+  return child;
+}
+
+function makeConnect() {
+  return {
+    getDevices: vi.fn(async () => [{ id: "dev1", name: "Test Bot", is_active: false }]),
+    findDeviceByName: vi.fn(async () => "dev1"),
+    transfer: vi.fn(async () => {}),
+    play: vi.fn(async () => {}),
+    pause: vi.fn(async () => {}),
+    resume: vi.fn(async () => {}),
+    seek: vi.fn(async () => {}),
+    getPlaybackState: vi.fn(async () => null as any),
+  };
+}
+
+function makeOAuth() {
+  return {
+    getAccessToken: vi.fn(async () => "tok-123" as string | null),
+    isAuthorized: () => true,
+  };
+}
+
+function makeHarness(
+  over: { connect?: any; oauth?: any; deps?: Partial<RustLibrespotBackendDeps> } = {},
+) {
+  const calls: string[] = [];
+  const librespotChild = makeFakeChild();
+  const ffmpegChild = makeFakeChild();
+
+  const spawn = vi.fn((cmd: string, ..._rest: any[]) => {
+    const isLibrespot = cmd.includes("librespot");
+    calls.push(`spawn:${isLibrespot ? "librespot" : cmd}`);
+    return isLibrespot ? librespotChild : ffmpegChild;
+  });
+  const mkdirSync = vi.fn();
+  const connect = over.connect ?? makeConnect();
+  const oauth = over.oauth ?? makeOAuth();
+
+  const backend = new RustLibrespotBackend({
+    deviceName: "Test Bot",
+    bitrate: 320,
+    cacheDir: "/tmp/cache",
+    oauth: oauth as any,
+    connect: connect as any,
+    logger: log,
+    deps: {
+      spawn: spawn as any,
+      mkdirSync: mkdirSync as any,
+      findBinary: () => "/bin/librespot",
+      // C1: pin ffmpeg so arg-array assertions stay stable while prod uses getFfmpegCommand().
+      ffmpegCommand: "ffmpeg",
+      sleep: async () => {},
+      readyPollIntervalMs: 1,
+      readyTimeoutMs: 100,
+      // huge so the background setInterval never fires; tests drive pollState() directly.
+      statePollIntervalMs: 10_000_000,
+      ...over.deps,
+    },
+  });
+
+  return { backend, calls, spawn, mkdirSync, connect, oauth, librespotChild, ffmpegChild };
+}
+
+describe("RustLibrespotBackend.start", () => {
+  it("spawns librespot with the pipe/stdout arg set and the OAuth access token", async () => {
+    const h = makeHarness();
+    await h.backend.start();
+    expect(h.spawn).toHaveBeenCalledWith(
+      "/bin/librespot",
+      [
+        "--name", "Test Bot",
+        "--backend", "pipe",
+        "--bitrate", "320",
+        "--format", "S16",
+        "--cache", "/tmp/cache",
+        "--device-type", "speaker",
+        "--access-token", "tok-123",
+      ],
+      expect.anything(),
+    );
+    // NO --device (=> stdout) and NO --passthrough (=> decoded PCM, not Ogg).
+    const args = h.spawn.mock.calls.find((c) => String(c[0]).includes("librespot"))![1] as string[];
+    expect(args).not.toContain("--device");
+    expect(args).not.toContain("--passthrough");
+    h.backend.stop();
+  });
+
+  it("spawns ffmpeg (reader) before librespot (writer) with the exact 44100->48000 s16le args", async () => {
+    const h = makeHarness();
+    await h.backend.start();
+    const ffmpegArgs = h.spawn.mock.calls.find((c) => c[0] === "ffmpeg")![1] as string[];
+    expect(ffmpegArgs).toEqual([
+      "-f", "s16le", "-ar", "44100", "-ac", "2", "-i", "pipe:0",
+      "-f", "s16le", "-ar", "48000", "-ac", "2", "-acodec", "pcm_s16le", "pipe:1",
+    ]);
+    const ffmpegIdx = h.calls.indexOf("spawn:ffmpeg");
+    const librespotIdx = h.calls.indexOf("spawn:librespot");
+    expect(ffmpegIdx).toBeGreaterThanOrEqual(0);
+    expect(librespotIdx).toBeGreaterThan(ffmpegIdx);
+    h.backend.stop();
+  });
+
+  it("getPcmStream() returns the ffmpeg stdout Readable", async () => {
+    const h = makeHarness();
+    await h.backend.start();
+    expect(h.backend.getPcmStream()).toBe(h.ffmpegChild.stdout);
+    h.backend.stop();
+  });
+
+  it("emits 'ready' and reports isReady() true once our device appears in getDevices()", async () => {
+    const h = makeHarness();
+    const ready = vi.fn();
+    h.backend.on("ready", ready);
+    await h.backend.start();
+    expect(h.connect.getDevices).toHaveBeenCalled();
+    expect(ready).toHaveBeenCalledTimes(1);
+    expect(h.backend.isReady()).toBe(true);
+    h.backend.stop();
+  });
+
+  it("keeps polling getDevices() until the device name appears", async () => {
+    const h = makeHarness();
+    h.connect.getDevices
+      .mockResolvedValueOnce([])
+      .mockResolvedValueOnce([{ id: "other", name: "Someone else", is_active: true }])
+      .mockResolvedValue([{ id: "dev1", name: "Test Bot", is_active: false }]);
+    await h.backend.start();
+    expect(h.connect.getDevices).toHaveBeenCalledTimes(3);
+    expect(h.backend.isReady()).toBe(true);
+    h.backend.stop();
+  });
+
+  it("throws (and does not spawn) when the OAuth token is null", async () => {
+    const oauth = makeOAuth();
+    oauth.getAccessToken.mockResolvedValue(null);
+    const h = makeHarness({ oauth });
+    await expect(h.backend.start()).rejects.toThrow(/authorized|token/i);
+    expect(h.spawn).not.toHaveBeenCalled();
+  });
+});
+
+describe("RustLibrespotBackend transport delegation (Connect API)", () => {
+  it("playTrack resolves the device then transfer(false) then play(uri)", async () => {
+    const h = makeHarness();
+    await h.backend.playTrack("spotify:track:go");
+    expect(h.connect.findDeviceByName).toHaveBeenCalledWith("Test Bot");
+    expect(h.connect.transfer).toHaveBeenCalledWith("dev1", false);
+    expect(h.connect.play).toHaveBeenCalledWith("dev1", "spotify:track:go");
+    // ordering: transfer before play
+    expect(h.connect.transfer.mock.invocationCallOrder[0])
+      .toBeLessThan(h.connect.play.mock.invocationCallOrder[0]);
+  });
+
+  it("playTrack throws when the device cannot be found", async () => {
+    const h = makeHarness();
+    h.connect.findDeviceByName.mockResolvedValue(null);
+    await expect(h.backend.playTrack("spotify:track:x")).rejects.toThrow(/device/i);
+  });
+
+  // R4-4 (multi-bot): control must be scoped to OUR device. playTrack resolves
+  // and stores our device id (dev1); pause/resume/seek then pass it to the
+  // Connect API so bot A's pause/resume/seek can't act on bot B's playback (the
+  // account-wide default would pause whatever device is currently active).
+  it("pause/resume/seek delegate to the Connect API scoped to OUR device, and seek updates position", async () => {
+    const h = makeHarness();
+    await h.backend.playTrack("spotify:track:go"); // stores our device id (dev1)
+    await h.backend.pause();
+    await h.backend.resume();
+    await h.backend.seek(5000);
+    expect(h.connect.pause).toHaveBeenCalledWith("dev1");
+    expect(h.connect.resume).toHaveBeenCalledWith("dev1");
+    expect(h.connect.seek).toHaveBeenCalledWith(5000, "dev1");
+    expect(h.backend.getPositionMs()).toBe(5000);
+  });
+});
+
+describe("RustLibrespotBackend track-end poll loop", () => {
+  it("emits trackEnded when progress reaches the end-of-track window", async () => {
+    const h = makeHarness();
+    const ended = vi.fn();
+    const meta = vi.fn();
+    h.backend.on("trackEnded", ended);
+    h.backend.on("metadata", meta);
+    // Arm detection the way production does — via our own playTrack().
+    await h.backend.playTrack("spotify:track:A");
+    h.connect.getPlaybackState
+      .mockResolvedValueOnce({ isPlaying: true, progressMs: 1000, trackUri: "spotify:track:A", durationMs: 200000 })
+      .mockResolvedValueOnce({ isPlaying: true, progressMs: 199000, trackUri: "spotify:track:A", durationMs: 200000 });
+    await (h.backend as any).pollState();
+    expect(meta).toHaveBeenCalledWith(expect.objectContaining({ uri: "spotify:track:A", durationMs: 200000 }));
+    expect(h.backend.getPositionMs()).toBe(1000);
+    expect(ended).not.toHaveBeenCalled();
+    await (h.backend as any).pollState();
+    expect(ended).toHaveBeenCalledWith({ uri: "spotify:track:A", reason: "ended" });
+  });
+
+  // C1(pause-skip): a USER pause reports is_playing:false with the SAME uri on
+  // the Rust backend. That MUST NOT be read as a track end (it would skip the
+  // paused track and break pause + occupancy auto-pause). Formerly the
+  // "!isPlaying after having played" test asserted the opposite — that encoded
+  // the bug; it is now split into this pause-no-skip test plus the two-poll
+  // external-stop test below.
+  it("does NOT emit trackEnded when the user PAUSES (self-initiated pause is not a track end)", async () => {
+    const h = makeHarness();
+    const ended = vi.fn();
+    h.backend.on("trackEnded", ended);
+    await h.backend.playTrack("spotify:track:A");
+    // Observe our track actually playing first.
+    h.connect.getPlaybackState.mockResolvedValueOnce({
+      isPlaying: true, progressMs: 5000, trackUri: "spotify:track:A", durationMs: 200000,
+    });
+    await (h.backend as any).pollState();
+    // User pauses: the Connect device stays loaded but reports is_playing:false
+    // with the SAME uri across every subsequent poll while paused.
+    await h.backend.pause();
+    h.connect.getPlaybackState.mockResolvedValue({
+      isPlaying: false, progressMs: 5000, trackUri: "spotify:track:A", durationMs: 200000,
+    });
+    await (h.backend as any).pollState();
+    await (h.backend as any).pollState(); // stays paused across multiple polls
+    expect(ended).not.toHaveBeenCalled();
+    // Resuming keeps the same track playing — still no spurious end.
+    await h.backend.resume();
+    h.connect.getPlaybackState.mockResolvedValue({
+      isPlaying: true, progressMs: 6000, trackUri: "spotify:track:A", durationMs: 200000,
+    });
+    await (h.backend as any).pollState();
+    expect(ended).not.toHaveBeenCalled();
+  });
+
+  it("emits trackEnded once on an EXTERNAL stop only after TWO consecutive !isPlaying polls (a transient mid-track !isPlaying is not a skip)", async () => {
+    const h = makeHarness();
+    const ended = vi.fn();
+    h.backend.on("trackEnded", ended);
+    await h.backend.playTrack("spotify:track:A");
+    h.connect.getPlaybackState
+      .mockResolvedValueOnce({ isPlaying: true, progressMs: 5000, trackUri: "spotify:track:A", durationMs: 200000 })
+      .mockResolvedValueOnce({ isPlaying: false, progressMs: 5000, trackUri: "spotify:track:A", durationMs: 200000 })
+      .mockResolvedValue({ isPlaying: false, progressMs: 5000, trackUri: "spotify:track:A", durationMs: 200000 });
+    await (h.backend as any).pollState(); // observed playing
+    await (h.backend as any).pollState(); // FIRST !isPlaying -> unconfirmed (could be transient buffering)
+    expect(ended).not.toHaveBeenCalled();
+    await (h.backend as any).pollState(); // SECOND consecutive !isPlaying -> confirmed external stop
+    await (h.backend as any).pollState(); // idempotent: no second emit for same track
+    expect(ended).toHaveBeenCalledTimes(1);
+    expect(ended).toHaveBeenCalledWith({ uri: "spotify:track:A", reason: "ended" });
+  });
+
+  it("a transient single !isPlaying poll followed by playing again does NOT emit trackEnded (buffering hiccup)", async () => {
+    const h = makeHarness();
+    const ended = vi.fn();
+    h.backend.on("trackEnded", ended);
+    await h.backend.playTrack("spotify:track:A");
+    h.connect.getPlaybackState
+      .mockResolvedValueOnce({ isPlaying: true, progressMs: 5000, trackUri: "spotify:track:A", durationMs: 200000 })
+      .mockResolvedValueOnce({ isPlaying: false, progressMs: 5000, trackUri: "spotify:track:A", durationMs: 200000 })
+      .mockResolvedValue({ isPlaying: true, progressMs: 6000, trackUri: "spotify:track:A", durationMs: 200000 });
+    await (h.backend as any).pollState(); // playing
+    await (h.backend as any).pollState(); // momentary !isPlaying (buffering)
+    await (h.backend as any).pollState(); // playing again -> stop confirmation reset
+    expect(ended).not.toHaveBeenCalled();
+  });
+
+  // m(sub-window): a track SHORTER than the end-of-track window must not be
+  // declared finished on its first observed-playing poll (durationMs - window
+  // is negative, so the old near-end check fired unconditionally).
+  it("does NOT false-finish a sub-window (< END_OF_TRACK_WINDOW_MS) duration on the first playing poll", async () => {
+    const h = makeHarness();
+    const ended = vi.fn();
+    h.backend.on("trackEnded", ended);
+    await h.backend.playTrack("spotify:track:short");
+    h.connect.getPlaybackState.mockResolvedValue({
+      isPlaying: true, progressMs: 100, trackUri: "spotify:track:short", durationMs: 1200,
+    });
+    await (h.backend as any).pollState();
+    expect(ended).not.toHaveBeenCalled();
+  });
+
+  // C1(pause-skip) residual: a self-initiated pause within the FINAL
+  // END_OF_TRACK_WINDOW_MS freezes progress at >= dur-window with is_playing:false
+  // and the SAME uri. The finishedByProgress near-end heuristic must NOT fire
+  // while paused (it would skip the paused track). After resume(), the track
+  // plays on and finishes exactly once.
+  it("does NOT skip when the user PAUSES within the final end-of-track window, but ends once after resume", async () => {
+    const h = makeHarness();
+    const ended = vi.fn();
+    h.backend.on("trackEnded", ended);
+    await h.backend.playTrack("spotify:track:A");
+    // Observe our track actually playing first (mid-track).
+    h.connect.getPlaybackState.mockResolvedValueOnce({
+      isPlaying: true, progressMs: 5000, trackUri: "spotify:track:A", durationMs: 200000,
+    });
+    await (h.backend as any).pollState();
+    // User pauses within the final ~1.5s: frozen progress >= dur-window,
+    // is_playing:false, SAME uri, across every subsequent paused poll.
+    await h.backend.pause();
+    h.connect.getPlaybackState.mockResolvedValue({
+      isPlaying: false, progressMs: 199000, trackUri: "spotify:track:A", durationMs: 200000,
+    });
+    await (h.backend as any).pollState();
+    await (h.backend as any).pollState(); // stays paused across multiple polls
+    expect(ended).not.toHaveBeenCalled();
+    // Resume -> the track plays on to its natural end and finishes exactly once.
+    await h.backend.resume();
+    h.connect.getPlaybackState.mockResolvedValue({
+      isPlaying: true, progressMs: 199000, trackUri: "spotify:track:A", durationMs: 200000,
+    });
+    await (h.backend as any).pollState();
+    expect(ended).toHaveBeenCalledTimes(1);
+    expect(ended).toHaveBeenCalledWith({ uri: "spotify:track:A", reason: "ended" });
+  });
+
+  // C1(pause-skip) residual: during a LONG self-initiated pause the Connect
+  // device can idle out to a 204 / null playback state. That null state while
+  // paused must NOT be read as a track end (it would skip the paused track).
+  // After resume() a genuinely dead device (persistent null) IS detected.
+  it("does NOT skip a PAUSED track when the device idles out to null/204, but DOES after resume", async () => {
+    const h = makeHarness();
+    const ended = vi.fn();
+    h.backend.on("trackEnded", ended);
+    await h.backend.playTrack("spotify:track:A");
+    // Observe our track actually playing first.
+    h.connect.getPlaybackState.mockResolvedValueOnce({
+      isPlaying: true, progressMs: 5000, trackUri: "spotify:track:A", durationMs: 200000,
+    });
+    await (h.backend as any).pollState();
+    // Pause, then the Connect device idles out to a 204 / null state.
+    await h.backend.pause();
+    h.connect.getPlaybackState.mockResolvedValue(null as any);
+    await (h.backend as any).pollState();
+    await (h.backend as any).pollState(); // stays paused across multiple null polls
+    expect(ended).not.toHaveBeenCalled();
+    // Resume -> a genuinely dead device (persistent null) is now detected once.
+    await h.backend.resume();
+    await (h.backend as any).pollState();
+    expect(ended).toHaveBeenCalledTimes(1);
+    expect(ended).toHaveBeenCalledWith({ uri: "spotify:track:A", reason: "ended" });
+  });
+
+  // Regression: a NON-paused track that idles out to a null/204 state after
+  // having played must STILL emit exactly one trackEnded (the pause gate must
+  // not suppress genuine device death for a non-paused track).
+  it("regression: a NON-paused track that idles out to null/204 after playing still emits exactly one trackEnded", async () => {
+    const h = makeHarness();
+    const ended = vi.fn();
+    h.backend.on("trackEnded", ended);
+    await h.backend.playTrack("spotify:track:A");
+    h.connect.getPlaybackState.mockResolvedValueOnce({
+      isPlaying: true, progressMs: 5000, trackUri: "spotify:track:A", durationMs: 200000,
+    });
+    await (h.backend as any).pollState(); // observed playing, not paused
+    h.connect.getPlaybackState.mockResolvedValue(null as any); // device idles out
+    await (h.backend as any).pollState();
+    await (h.backend as any).pollState(); // idempotent: no second emit
+    expect(ended).toHaveBeenCalledTimes(1);
+    expect(ended).toHaveBeenCalledWith({ uri: "spotify:track:A", reason: "ended" });
+  });
+
+  // R3-1: a GENUINE end where the item stays null across TWO consecutive
+  // non-paused polls still emits exactly one trackEnded. The null-item path now
+  // shares the external-stop two-poll confirmation, so a single transient null
+  // (Connect handoff / market relink) no longer skips a still-playing track —
+  // but a persistent null is still detected. (Previously this test asserted a
+  // single null poll ended the track; that encoded the R3-1 corner-case bug.)
+  it("emits trackEnded once when the track uri stays null across TWO consecutive polls after playing", async () => {
+    const h = makeHarness();
+    const ended = vi.fn();
+    h.backend.on("trackEnded", ended);
+    await h.backend.playTrack("spotify:track:A");
+    h.connect.getPlaybackState
+      .mockResolvedValueOnce({ isPlaying: true, progressMs: 1000, trackUri: "spotify:track:A", durationMs: 200000 })
+      .mockResolvedValue({ isPlaying: true, progressMs: 0, trackUri: null, durationMs: 0 });
+    await (h.backend as any).pollState(); // observed playing our uri
+    await (h.backend as any).pollState(); // FIRST null item -> unconfirmed (could be transient)
+    expect(ended).not.toHaveBeenCalled();
+    await (h.backend as any).pollState(); // SECOND consecutive null -> confirmed end
+    await (h.backend as any).pollState(); // idempotent: no second emit for same track
+    expect(ended).toHaveBeenCalledTimes(1);
+    expect(ended).toHaveBeenCalledWith({ uri: "spotify:track:A", reason: "ended" });
+  });
+
+  // R3-1: Spotify legitimately returns item:null transiently at a track/Connect
+  // handoff boundary, and getPlaybackState omits the `market` param so a
+  // region-relinked/restricted item can momentarily map to uri:null. A SINGLE
+  // {isPlaying:true, trackUri:null} poll mid-track must NOT skip a still-playing
+  // track; a following poll showing our real uri again confirms it kept playing.
+  it("a transient single null-item poll (isPlaying:true, trackUri:null) followed by our uri again does NOT emit trackEnded", async () => {
+    const h = makeHarness();
+    const ended = vi.fn();
+    h.backend.on("trackEnded", ended);
+    await h.backend.playTrack("spotify:track:A");
+    h.connect.getPlaybackState
+      .mockResolvedValueOnce({ isPlaying: true, progressMs: 5000, trackUri: "spotify:track:A", durationMs: 200000 })
+      .mockResolvedValueOnce({ isPlaying: true, progressMs: 0, trackUri: null, durationMs: 0 })
+      .mockResolvedValue({ isPlaying: true, progressMs: 6000, trackUri: "spotify:track:A", durationMs: 200000 });
+    await (h.backend as any).pollState(); // playing our uri
+    await (h.backend as any).pollState(); // momentary null item (handoff / market relink)
+    await (h.backend as any).pollState(); // our uri again -> confirmation reset, still playing
+    expect(ended).not.toHaveBeenCalled();
+  });
+
+  // R3-1 (pause invariant): a self-paused track must NEVER skip. A {trackUri:null}
+  // poll while WE hold a pause must not be read as a track end (same invariant
+  // the finishedByStop / null-204 paths already enforce with a `!paused` guard).
+  it("does NOT emit trackEnded on a null-item poll while the track is self-paused", async () => {
+    const h = makeHarness();
+    const ended = vi.fn();
+    h.backend.on("trackEnded", ended);
+    await h.backend.playTrack("spotify:track:A");
+    h.connect.getPlaybackState.mockResolvedValueOnce({
+      isPlaying: true, progressMs: 5000, trackUri: "spotify:track:A", durationMs: 200000,
+    });
+    await (h.backend as any).pollState(); // observed playing
+    await h.backend.pause();
+    // While paused, a null item appears across multiple polls (state present, no item).
+    h.connect.getPlaybackState.mockResolvedValue({
+      isPlaying: false, progressMs: 5000, trackUri: null, durationMs: 0,
+    });
+    await (h.backend as any).pollState();
+    await (h.backend as any).pollState();
+    expect(ended).not.toHaveBeenCalled();
+  });
+
+  it("ignores a null playback state (no active device) without emitting", async () => {
+    const h = makeHarness();
+    const ended = vi.fn();
+    h.backend.on("trackEnded", ended);
+    h.connect.getPlaybackState.mockResolvedValue(null);
+    await (h.backend as any).pollState();
+    expect(ended).not.toHaveBeenCalled();
+  });
+
+  it("C3.4: a startup poll before playTrack never emits (foreign track near its end)", async () => {
+    const h = makeHarness();
+    const ended = vi.fn();
+    const meta = vi.fn();
+    h.backend.on("trackEnded", ended);
+    h.backend.on("metadata", meta);
+    // Backend started, but playTrack has NOT been called => detection disarmed.
+    await h.backend.start();
+    // First poll observes a FOREIGN track that is actively playing near its end.
+    h.connect.getPlaybackState.mockResolvedValue({
+      isPlaying: true,
+      progressMs: 199000,
+      trackUri: "spotify:foreign",
+      durationMs: 200000,
+    });
+    await (h.backend as any).pollState();
+    // No spurious end-of-track and no bogus metadata before the bot ever plays.
+    expect(ended).not.toHaveBeenCalled();
+    expect(meta).not.toHaveBeenCalled();
+    expect(h.backend.getPositionMs()).toBe(0);
+    h.backend.stop();
+  });
+
+  it("after playTrack, a normal finish emits trackEnded exactly once for our uri", async () => {
+    const h = makeHarness();
+    const ended = vi.fn();
+    h.backend.on("trackEnded", ended);
+    // Arm detection via our own play, then confirm-then-finish our uri.
+    await h.backend.playTrack("spotify:track:ours");
+    h.connect.getPlaybackState
+      .mockResolvedValueOnce({ isPlaying: true, progressMs: 1000, trackUri: "spotify:track:ours", durationMs: 200000 })
+      .mockResolvedValueOnce({ isPlaying: true, progressMs: 199000, trackUri: "spotify:track:ours", durationMs: 200000 });
+    await (h.backend as any).pollState(); // confirms our uri playing
+    expect(ended).not.toHaveBeenCalled();
+    await (h.backend as any).pollState(); // finishes
+    expect(ended).toHaveBeenCalledTimes(1);
+    expect(ended).toHaveBeenCalledWith({ uri: "spotify:track:ours", reason: "ended" });
+  });
+});
+
+// R4-4 (multi-bot): config.spotify (and thus the Connect session) is shared by
+// every bot under one Premium account, which supports only ONE active playback
+// stream. GET /v1/me/player is account-wide, so once bot B steals the active
+// session our poll would see B's device + B's track. The backend now stores OUR
+// device id and, when the reported activeDeviceId differs, refuses to treat the
+// foreign playback as ours: no foreign metadata, no misattribution — the stolen
+// session instead advances OUR queue cleanly via the existing two-poll stop.
+describe("RustLibrespotBackend multi-bot device scoping (R4-4)", () => {
+  it("ignores foreign-device poll state: no foreign metadata, no misattribution, and a stolen session advances OUR queue once", async () => {
+    const h = makeHarness();
+    const ended = vi.fn();
+    const meta = vi.fn();
+    h.backend.on("trackEnded", ended);
+    h.backend.on("metadata", meta);
+    // Our track plays on OUR device (dev1 — the findDeviceByName mock id).
+    await h.backend.playTrack("spotify:track:ours");
+    h.connect.getPlaybackState.mockResolvedValueOnce({
+      isPlaying: true, progressMs: 5000, trackUri: "spotify:track:ours",
+      durationMs: 200000, activeDeviceId: "dev1",
+    });
+    await (h.backend as any).pollState(); // our track observed playing on our device
+    expect(meta).toHaveBeenCalledTimes(1);
+    expect(meta).toHaveBeenCalledWith(expect.objectContaining({ uri: "spotify:track:ours" }));
+    expect(h.backend.getPositionMs()).toBe(5000);
+    meta.mockClear();
+    // Bot B steals the single active Connect session: /v1/me/player now reports
+    // THEIR device (dev2) + THEIR track, and would keep doing so every poll.
+    h.connect.getPlaybackState.mockResolvedValue({
+      isPlaying: true, progressMs: 123000, trackUri: "spotify:track:foreign",
+      durationMs: 200000, activeDeviceId: "dev2",
+    });
+    await (h.backend as any).pollState(); // FIRST foreign poll -> unconfirmed stop, no side effects
+    expect(meta).not.toHaveBeenCalled();            // foreign metadata NOT surfaced as ours
+    expect(ended).not.toHaveBeenCalled();            // two-poll confirmation not met yet
+    expect(h.backend.getPositionMs()).toBe(5000);    // foreign progress NOT misattributed
+    await (h.backend as any).pollState(); // SECOND foreign poll -> confirmed -> OUR queue advances
+    await (h.backend as any).pollState(); // idempotent: no second emit for our track
+    expect(ended).toHaveBeenCalledTimes(1);
+    expect(ended).toHaveBeenCalledWith({ uri: "spotify:track:ours", reason: "ended" });
+    expect(meta).not.toHaveBeenCalled();             // never emitted metadata for the foreign uri
+  });
+
+  it("when the active device IS ours (activeDeviceId === our id), end-detection behaves exactly as today", async () => {
+    const h = makeHarness();
+    const ended = vi.fn();
+    h.backend.on("trackEnded", ended);
+    await h.backend.playTrack("spotify:track:A");
+    h.connect.getPlaybackState
+      .mockResolvedValueOnce({ isPlaying: true, progressMs: 1000, trackUri: "spotify:track:A", durationMs: 200000, activeDeviceId: "dev1" })
+      .mockResolvedValueOnce({ isPlaying: true, progressMs: 199000, trackUri: "spotify:track:A", durationMs: 200000, activeDeviceId: "dev1" });
+    await (h.backend as any).pollState(); // confirms our uri playing on our device
+    expect(ended).not.toHaveBeenCalled();
+    await (h.backend as any).pollState(); // near-end -> finishes normally
+    expect(ended).toHaveBeenCalledTimes(1);
+    expect(ended).toHaveBeenCalledWith({ uri: "spotify:track:A", reason: "ended" });
+  });
+});
+
+// R4-6: finishedByProgress is a SINGLE-poll near-end heuristic. If a user
+// deliberately SEEKS to within the final END_OF_TRACK_WINDOW_MS, the next poll
+// would see progressMs >= durationMs-1500 and emit trackEnded — skipping the ~1s
+// the user seeked into. A one-poll "just-seeked" grace suppresses that single
+// misfire; the track then plays its remaining <=1.5s and ends naturally on the
+// following poll via the stop/null detection. Natural near-end (reached by
+// PLAYING, no seek) must be UNCHANGED.
+describe("RustLibrespotBackend seek-into-end grace (R4-6)", () => {
+  it("does NOT skip when a seek lands within the final end-of-track window; ends naturally on the following poll", async () => {
+    const h = makeHarness();
+    const ended = vi.fn();
+    h.backend.on("trackEnded", ended);
+    await h.backend.playTrack("spotify:track:A");
+    // Observe our track actually playing first (mid-track).
+    h.connect.getPlaybackState.mockResolvedValueOnce({
+      isPlaying: true, progressMs: 5000, trackUri: "spotify:track:A", durationMs: 200000,
+    });
+    await (h.backend as any).pollState();
+    // User deliberately seeks to ~1s before the end (inside the 1.5s window).
+    await h.backend.seek(199000);
+    // First poll after the seek: progress is already inside the near-end window
+    // and still playing. The grace must suppress this single finishedByProgress.
+    h.connect.getPlaybackState.mockResolvedValueOnce({
+      isPlaying: true, progressMs: 199000, trackUri: "spotify:track:A", durationMs: 200000,
+    });
+    await (h.backend as any).pollState();
+    expect(ended).not.toHaveBeenCalled();
+    // The remaining <=1.5s plays out and librespot goes idle (null/204) — the
+    // genuine end. It emits exactly one trackEnded.
+    h.connect.getPlaybackState.mockResolvedValue(null as any);
+    await (h.backend as any).pollState();
+    expect(ended).toHaveBeenCalledTimes(1);
+    expect(ended).toHaveBeenCalledWith({ uri: "spotify:track:A", reason: "ended" });
+  });
+
+  it("the seek grace only spans ONE poll: a second in-window playing poll still finishes by progress", async () => {
+    const h = makeHarness();
+    const ended = vi.fn();
+    h.backend.on("trackEnded", ended);
+    await h.backend.playTrack("spotify:track:A");
+    h.connect.getPlaybackState.mockResolvedValueOnce({
+      isPlaying: true, progressMs: 5000, trackUri: "spotify:track:A", durationMs: 200000,
+    });
+    await (h.backend as any).pollState(); // observed playing
+    await h.backend.seek(199000); // seek into the final window
+    // Grace poll: suppressed.
+    h.connect.getPlaybackState.mockResolvedValueOnce({
+      isPlaying: true, progressMs: 199000, trackUri: "spotify:track:A", durationMs: 200000,
+    });
+    await (h.backend as any).pollState();
+    expect(ended).not.toHaveBeenCalled();
+    // Second in-window playing poll: grace already consumed -> natural near-end
+    // detection fires exactly once (grace must not permanently disable it).
+    h.connect.getPlaybackState.mockResolvedValueOnce({
+      isPlaying: true, progressMs: 199500, trackUri: "spotify:track:A", durationMs: 200000,
+    });
+    await (h.backend as any).pollState();
+    expect(ended).toHaveBeenCalledTimes(1);
+    expect(ended).toHaveBeenCalledWith({ uri: "spotify:track:A", reason: "ended" });
+  });
+
+  it("regression: a track that reaches the final window by PLAYING (no seek) still emits trackEnded on the first in-window poll", async () => {
+    const h = makeHarness();
+    const ended = vi.fn();
+    h.backend.on("trackEnded", ended);
+    await h.backend.playTrack("spotify:track:A");
+    h.connect.getPlaybackState
+      .mockResolvedValueOnce({ isPlaying: true, progressMs: 1000, trackUri: "spotify:track:A", durationMs: 200000 })
+      .mockResolvedValueOnce({ isPlaying: true, progressMs: 199000, trackUri: "spotify:track:A", durationMs: 200000 });
+    await (h.backend as any).pollState(); // observed playing (no seek)
+    expect(ended).not.toHaveBeenCalled();
+    await (h.backend as any).pollState(); // reaches window by PLAYING -> natural end
+    expect(ended).toHaveBeenCalledTimes(1);
+    expect(ended).toHaveBeenCalledWith({ uri: "spotify:track:A", reason: "ended" });
+  });
+});
+
+describe("RustLibrespotBackend playback-start watchdog (I4 degrade-to-skip)", () => {
+  /** A controllable timer seam matching the file's injected-deps style. */
+  function makeFakeTimer() {
+    const pending: Array<{ cb: () => void; ms: number; handle: object }> = [];
+    const setTimer = vi.fn((cb: () => void, ms: number) => {
+      const handle = {};
+      pending.push({ cb, ms, handle });
+      return handle;
+    });
+    const clearTimer = vi.fn((h: unknown) => {
+      const i = pending.findIndex((p) => p.handle === h);
+      if (i >= 0) pending.splice(i, 1);
+    });
+    // "advance fake timers": run (and drain) every armed callback.
+    const advance = () => pending.splice(0).forEach((p) => p.cb());
+    return { setTimer, clearTimer, advance, pending };
+  }
+
+  it("emits exactly ONE trackEnded{reason:'error'} when playback never starts", async () => {
+    const timer = makeFakeTimer();
+    const h = makeHarness({
+      deps: {
+        playbackStartTimeoutMs: 8000,
+        setTimeout: timer.setTimer as any,
+        clearTimeout: timer.clearTimer as any,
+      },
+    });
+    const ended = vi.fn();
+    h.backend.on("trackEnded", ended);
+
+    // The connect layer NEVER reports our track playing (204 / idle).
+    h.connect.getPlaybackState.mockResolvedValue(null);
+    await h.backend.playTrack("spotify:track:stuck");
+    // Polls that never observe playback must NOT emit anything on their own.
+    await (h.backend as any).pollState();
+    await (h.backend as any).pollState();
+    expect(ended).not.toHaveBeenCalled();
+
+    // The watchdog is armed exactly once; advance past playbackStartTimeoutMs.
+    expect(timer.pending).toHaveLength(1);
+    expect(timer.pending[0].ms).toBe(8000);
+    timer.advance();
+
+    // Degraded-to-skip: one trackEnded with reason "error" for our uri.
+    expect(ended).toHaveBeenCalledTimes(1);
+    expect(ended).toHaveBeenCalledWith({ uri: "spotify:track:stuck", reason: "error" });
+
+    // A late idle poll after the watchdog fired does not double-emit.
+    await (h.backend as any).pollState();
+    expect(ended).toHaveBeenCalledTimes(1);
+    h.backend.stop();
+  });
+
+  it("does NOT fire the watchdog when the device actually starts playing", async () => {
+    const timer = makeFakeTimer();
+    const h = makeHarness({
+      deps: {
+        playbackStartTimeoutMs: 8000,
+        setTimeout: timer.setTimer as any,
+        clearTimeout: timer.clearTimer as any,
+      },
+    });
+    const ended = vi.fn();
+    h.backend.on("trackEnded", ended);
+
+    await h.backend.playTrack("spotify:track:ok");
+    // Our device reports the track actually playing -> watchdog is disarmed.
+    h.connect.getPlaybackState.mockResolvedValue({
+      isPlaying: true,
+      progressMs: 1000,
+      trackUri: "spotify:track:ok",
+      durationMs: 200000,
+    });
+    await (h.backend as any).pollState();
+
+    // Real playback observed -> the watchdog was cleared, not left armed.
+    expect(timer.clearTimer).toHaveBeenCalled();
+    expect(timer.pending).toHaveLength(0);
+    // Even if a stale timer somehow fired, no "error" end must be emitted.
+    timer.advance();
+    expect(ended).not.toHaveBeenCalledWith(
+      expect.objectContaining({ reason: "error" }),
+    );
+    h.backend.stop();
+  });
+
+  it("a new playTrack() cancels the previous track's watchdog (at-most-one per track)", async () => {
+    const timer = makeFakeTimer();
+    const h = makeHarness({
+      deps: {
+        playbackStartTimeoutMs: 8000,
+        setTimeout: timer.setTimer as any,
+        clearTimeout: timer.clearTimer as any,
+      },
+    });
+    const ended = vi.fn();
+    h.backend.on("trackEnded", ended);
+    h.connect.getPlaybackState.mockResolvedValue(null);
+
+    await h.backend.playTrack("spotify:track:one");
+    await h.backend.playTrack("spotify:track:two");
+    // The first track's watchdog was cleared; only the second remains armed.
+    expect(timer.clearTimer).toHaveBeenCalled();
+    expect(timer.pending).toHaveLength(1);
+    timer.advance();
+    expect(ended).toHaveBeenCalledTimes(1);
+    expect(ended).toHaveBeenCalledWith({ uri: "spotify:track:two", reason: "error" });
+    h.backend.stop();
+  });
+});
+
+describe("RustLibrespotBackend.stop", () => {
+  it("kills librespot + ffmpeg, clears ready, and is idempotent", async () => {
+    const h = makeHarness();
+    await h.backend.start();
+    h.backend.stop();
+    h.backend.stop(); // second call must not throw
+    expect(h.librespotChild.kill).toHaveBeenCalled();
+    expect(h.ffmpegChild.kill).toHaveBeenCalled();
+    expect(h.backend.isReady()).toBe(false);
+  });
+});
+
+describe("RustLibrespotBackend.start failure cleanup", () => {
+  it("tears down librespot + ffmpeg when the device never appears", async () => {
+    const h = makeHarness();
+    h.connect.getDevices.mockResolvedValue([]); // device never shows up -> waitForDevice times out
+    await expect(h.backend.start()).rejects.toThrow(/did not appear/i);
+    expect(h.librespotChild.kill).toHaveBeenCalled();
+    expect(h.ffmpegChild.kill).toHaveBeenCalled();
+    expect(h.backend.isReady()).toBe(false);
+  });
+});
+
+describe("RustLibrespotBackend child-process error handling", () => {
+  it("swallows+logs a child 'error' when no backend 'error' listener is attached", async () => {
+    const h = makeHarness();
+    await h.backend.start();
+    expect(h.backend.listenerCount("error")).toBe(0);
+    expect(() => h.librespotChild.emit("error", new Error("boom"))).not.toThrow();
+    expect(() => h.ffmpegChild.emit("error", new Error("boom"))).not.toThrow();
+    h.backend.stop();
+  });
+
+  it("re-emits a child 'error' to an attached backend 'error' listener", async () => {
+    const h = makeHarness();
+    await h.backend.start();
+    const onErr = vi.fn();
+    h.backend.on("error", onErr);
+    const err = new Error("ffmpeg boom");
+    h.ffmpegChild.emit("error", err);
+    expect(onErr).toHaveBeenCalledWith(err);
+    h.backend.stop();
+  });
+
+  // I(pipe): ffmpeg dying mid-track while librespot keeps producing PCM raises
+  // EPIPE on ffmpeg.stdin. With no stdin 'error' listener Node escalates it to
+  // process 'uncaughtException'. The backend must handle it in-band.
+  it("swallows an EPIPE 'error' on ffmpeg.stdin (ffmpeg died mid-track) without an unhandled throw", async () => {
+    const h = makeHarness();
+    await h.backend.start();
+    expect(h.backend.listenerCount("error")).toBe(0);
+    const epipe = Object.assign(new Error("write EPIPE"), { code: "EPIPE" });
+    expect(() => h.ffmpegChild.stdin.emit("error", epipe)).not.toThrow();
+    h.backend.stop(); // idempotent second teardown must not throw
+  });
+
+  it("routes an ffmpeg.stdin EPIPE to the backend 'error' listener and tears down cleanly", async () => {
+    const h = makeHarness();
+    await h.backend.start();
+    const onErr = vi.fn();
+    h.backend.on("error", onErr);
+    const epipe = Object.assign(new Error("write EPIPE"), { code: "EPIPE" });
+    expect(() => h.ffmpegChild.stdin.emit("error", epipe)).not.toThrow();
+    expect(onErr).toHaveBeenCalledWith(epipe);
+    // Broken pipe -> clean teardown: children killed, not ready.
+    expect(h.librespotChild.kill).toHaveBeenCalled();
+    expect(h.ffmpegChild.kill).toHaveBeenCalled();
+    expect(h.backend.isReady()).toBe(false);
+    h.backend.stop(); // second teardown must not throw (no double-teardown crash)
+    expect(onErr).toHaveBeenCalledTimes(1); // single emit despite both pipe ends
+  });
+
+  it("does not throw when librespot proc.stdout emits an EPIPE on the broken pipe", async () => {
+    const h = makeHarness();
+    await h.backend.start();
+    const epipe = Object.assign(new Error("read/write EPIPE"), { code: "EPIPE" });
+    expect(() => h.librespotChild.stdout.emit("error", epipe)).not.toThrow();
+    h.backend.stop();
+  });
+});

src/music/spotify/rust-librespot.ts

@@ -0,0 +1,620 @@
+import { EventEmitter } from "node:events";
+import type { Readable } from "node:stream";
+import type { ChildProcess } from "node:child_process";
+import { spawn as realSpawn } from "node:child_process";
+import { mkdirSync as realMkdirSync } from "node:fs";
+import type { Logger } from "pino";
+import type {
+  SpotifyAudioBackend,
+  SpotifyTrackEndedEvent,
+  SpotifyNowPlaying,
+} from "./backend.js";
+import { findLibrespot } from "./binary.js";
+import { SpotifyConnectApi } from "./connect-api.js";
+import type { PlaybackState, SpotifyDevice } from "./connect-api.js";
+import type { SpotifyOAuth } from "./spotify-oauth.js";
+import { getFfmpegCommand } from "../../audio/player.js";
+
+export interface RustLibrespotBackendOptions {
+  deviceName: string;
+  bitrate: number;
+  cacheDir: string;
+  oauth: SpotifyOAuth;
+  connect?: SpotifyConnectApi;
+  logger: Logger;
+  deps?: RustLibrespotBackendDeps;
+}
+
+/** Injectable seams so the whole lifecycle is testable without a real binary/network. */
+export interface RustLibrespotBackendDeps {
+  spawn?: typeof realSpawn;
+  mkdirSync?: typeof realMkdirSync;
+  findBinary?: () => string;
+  /**
+   * C1: override the ffmpeg command. Production resolves it via
+   * getFfmpegCommand() (bundled ffmpeg-static fallback when `ffmpeg` isn't on
+   * PATH); tests pin it to "ffmpeg" for stable arg assertions.
+   */
+  ffmpegCommand?: string;
+  sleep?: (ms: number) => Promise<void>;
+  readyPollIntervalMs?: number;
+  readyTimeoutMs?: number;
+  statePollIntervalMs?: number;
+  /**
+   * I4 (§13): bounded window after playTrack() within which our own track must
+   * be observed playing, else we degrade-to-skipped (emit trackEnded
+   * reason:"error"). Injectable timer seams (default real setTimeout, unref'd)
+   * let tests advance it deterministically.
+   */
+  playbackStartTimeoutMs?: number;
+  setTimeout?: (cb: () => void, ms: number) => unknown;
+  clearTimeout?: (handle: unknown) => void;
+}
+
+const DEFAULT_READY_POLL_MS = 500;
+const DEFAULT_READY_TIMEOUT_MS = 20_000;
+const DEFAULT_STATE_POLL_MS = 2_000;
+/** How close to the end (ms) counts as "track finished" when polling player state. */
+const END_OF_TRACK_WINDOW_MS = 1_500;
+/**
+ * I4 (§13): if our own track has not been observed playing within this window
+ * after playTrack(), degrade-to-skipped so the queue advances instead of
+ * stalling on a persistently-failing play (403 non-Premium, 404 outliving
+ * retries). Bounded and injectable for tests.
+ */
+const DEFAULT_PLAYBACK_START_TIMEOUT_MS = 8_000;
+
+const defaultSleep = (ms: number) => new Promise<void>((r) => setTimeout(r, ms));
+
+export class RustLibrespotBackend extends EventEmitter implements SpotifyAudioBackend {
+  private readonly opts: RustLibrespotBackendOptions;
+  private readonly log: Logger;
+  private readonly deps: RustLibrespotBackendDeps;
+  private readonly oauth: SpotifyOAuth;
+  private readonly connect: SpotifyConnectApi;
+
+  private proc: ChildProcess | null = null;
+  private ffmpeg: ChildProcess | null = null;
+  private pollTimer: ReturnType<typeof setInterval> | null = null;
+  // I4 (§13): "did our track actually start playing?" watchdog handle (opaque —
+  // produced by the injectable setTimeout seam). null when disarmed.
+  private watchdogTimer: unknown = null;
+  private ready = false;
+  private positionMs = 0;
+
+  // R4-4 (multi-bot): OUR resolved Connect device id, captured from
+  // findDeviceByName() in playTrack(). config.spotify (hence this Connect
+  // session) is shared process-wide across every BotInstance under one Premium
+  // account, and both the control API (pause/resume/seek) and the state read
+  // (GET /v1/me/player) are ACCOUNT-wide by default. Persisting our device id
+  // lets us (a) device-scope our control commands so we only ever act on our own
+  // device, and (b) in pollState, ignore state reported for a foreign device
+  // another bot stole the single active session with. null until first playTrack.
+  private deviceId: string | null = null;
+
+  // track-end poll state machine
+  private currentUri: string | null = null;
+  private hasPlayed = false;
+  private endedForCurrent = false;
+  // C3.4: end-detection is DISARMED until our own playTrack() runs. A poll that
+  // fires before the bot ever asks to play (e.g. at startup) must produce no
+  // side effects at all, so a foreign track already near its end can't emit a
+  // spurious trackEnded/metadata and wrongly advance the queue.
+  private armed = false;
+  // C1(pause-skip): our own pause state. A self-initiated pause makes the
+  // Connect device report is_playing:false with the SAME uri; without tracking
+  // it we'd misread that as a track end and SKIP the paused track (breaking the
+  // pause command and occupancy auto-pause-when-alone on the Rust backend). Set
+  // by pause(), cleared by resume() and playTrack().
+  private paused = false;
+  // Robustness (finishedByStop + finishedByNull / R3-1): a "not clearly playing
+  // our track" signal — either a non-paused is_playing:false (external stop) OR
+  // a null item (trackUri===null) observed while our track was playing — must be
+  // confirmed across TWO consecutive non-paused polls before we emit trackEnded.
+  // Both signals can be momentary: is_playing:false from a buffering hiccup; a
+  // null item from a Connect/track handoff boundary or a region-relinked /
+  // restricted item that momentarily maps to uri:null (getPlaybackState omits
+  // the `market` param). Set on the first such poll; reset only when a poll
+  // clearly shows our track playing again (is_playing AND a real item), on track
+  // change, or on playTrack(). Sharing ONE flag keeps both sibling paths from
+  // false-skipping on a single transient poll.
+  private stopSeen = false;
+  // R4-6: one-poll "just-seeked" grace. finishedByProgress is a SINGLE-poll
+  // near-end heuristic; if a user deliberately seeks to within the final
+  // END_OF_TRACK_WINDOW_MS, the very next poll would see progressMs >=
+  // durationMs-window and emit trackEnded, SKIPPING the ~1s the user seeked
+  // into. Set by seek(); consumed on the next poll so it suppresses that single
+  // finishedByProgress misfire only — the track then plays its remaining <=1.5s
+  // and ends naturally on the following poll via the stop/null detection. It
+  // deliberately does NOT touch the paused/stop/null two-poll logic, and a track
+  // reaching the window by PLAYING (no preceding seek) still ends normally.
+  private seekGrace = false;
+  // I(pipe): one teardown per broken librespot->ffmpeg pipe. Both stream ends
+  // (ffmpeg.stdin write side, proc.stdout read side) can report the same EPIPE;
+  // this guard prevents a double teardown / double error-emit.
+  private pipeBroke = false;
+
+  constructor(o: RustLibrespotBackendOptions) {
+    super();
+    this.opts = o;
+    this.log = o.logger;
+    this.deps = o.deps ?? {};
+    this.oauth = o.oauth;
+    // The Connect API shares the backend's OAuth token source. Reuse the
+    // injected instance in tests; otherwise build one over oauth.getAccessToken().
+    this.connect = o.connect ?? new SpotifyConnectApi(() => this.oauth.getAccessToken());
+  }
+
+  async start(): Promise<void> {
+    const spawn = this.deps.spawn ?? realSpawn;
+    const mkdirSync = this.deps.mkdirSync ?? realMkdirSync;
+    const findBinary = this.deps.findBinary ?? findLibrespot;
+    // C1: resolve ffmpeg via getFfmpegCommand() unless injected for tests.
+    const ffmpegCommand = this.deps.ffmpegCommand ?? getFfmpegCommand();
+
+    // A valid USER control token is required before we spawn anything.
+    const token = await this.oauth.getAccessToken();
+    if (!token) {
+      throw new Error("Spotify not authorized (no access token) — sign in first");
+    }
+
+    mkdirSync(this.opts.cacheDir, { recursive: true });
+
+    // Everything past here spawns children / opens the state poll. On any
+    // failure (e.g. the device never appears), tear it all down via stop().
+    try {
+      this.pipeBroke = false; // fresh pipe for this start()
+      // 1. Spawn ffmpeg FIRST (the reader) so its stdin pipe is ready before
+      //    librespot starts pushing raw 44.1k s16le PCM into it.
+      this.ffmpeg = spawn(
+        ffmpegCommand,
+        [
+          "-f", "s16le", "-ar", "44100", "-ac", "2", "-i", "pipe:0",
+          "-f", "s16le", "-ar", "48000", "-ac", "2", "-acodec", "pcm_s16le", "pipe:1",
+        ],
+        { stdio: ["pipe", "pipe", "pipe"] },
+      );
+      this.ffmpeg.stderr?.on("data", (b: Buffer) =>
+        this.log.debug({ ffmpeg: b.toString().trim() }, "ffmpeg"),
+      );
+      this.ffmpeg.on("error", (err) => this.emitError(err));
+      // I(pipe): if ffmpeg dies mid-track while librespot keeps producing PCM,
+      // the next write into its stdin hits the now-closed pipe -> EPIPE 'error'
+      // on stdin. With no listener Node escalates that to process
+      // 'uncaughtException' (the global handler logs but leaves undefined
+      // state). Handle it in-band: tear down cleanly and surface via emitError.
+      this.ffmpeg.stdin?.on("error", (err) => this.onPipeError(err));
+
+      // 2. Spawn librespot: --backend pipe with NO --device => raw s16le/44100/2
+      //    on stdout, NO --passthrough (that would emit raw Ogg). --access-token
+      //    authenticates it as a Connect device controllable via the Web API.
+      const bin = findBinary();
+      this.proc = spawn(
+        bin,
+        [
+          "--name", this.opts.deviceName,
+          "--backend", "pipe",
+          "--bitrate", String(this.opts.bitrate),
+          "--format", "S16",
+          "--cache", this.opts.cacheDir,
+          "--device-type", "speaker",
+          // KNOWN LIMITATION (CWE-214): the live Spotify access token is passed in
+          // the child argv, so on a shared/multi-tenant host a co-located local
+          // process could read it via `ps` / /proc/<pid>/cmdline. Bounded (~1h token,
+          // needs local access) and `--access-token` is librespot's supported bootstrap.
+          "--access-token", token,
+        ],
+        { stdio: ["ignore", "pipe", "pipe"] },
+      );
+      // stdout carries PCM — pipe it, never attach a data listener that consumes it.
+      if (this.proc.stdout && this.ffmpeg.stdin) {
+        this.proc.stdout.pipe(this.ffmpeg.stdin);
+        // Guard the read side too: a broken pipe can surface as an 'error' on
+        // proc.stdout when ffmpeg's stdin closes underneath it. Same handler,
+        // guarded against a double teardown.
+        this.proc.stdout.on("error", (err) => this.onPipeError(err));
+      }
+      this.proc.stderr?.on("data", (b: Buffer) =>
+        this.log.info({ librespot: b.toString().trim() }, "librespot"),
+      );
+      this.proc.on("error", (err) => this.emitError(err));
+      this.proc.on("exit", (code, signal) => {
+        this.ready = false;
+        this.log.warn({ code, signal }, "librespot exited");
+      });
+
+      // 3. Poll the Connect device list until our device registers.
+      await this.waitForDevice();
+
+      // 4. Begin the player-state poll loop (track-end / position / metadata).
+      this.startPollLoop();
+
+      this.ready = true;
+      this.emit("ready");
+    } catch (e) {
+      this.stop();
+      throw e;
+    }
+  }
+
+  /**
+   * Re-emit a child "error" only when a consumer is listening; Node throws on an
+   * unhandled "error" event, so with no listener we log via the injected logger.
+   */
+  private emitError(err: unknown): void {
+    if (this.listenerCount("error") > 0) {
+      this.emit("error", err);
+    } else {
+      this.log.error({ err }, "rust-librespot backend error (no listener)");
+    }
+  }
+
+  /**
+   * I(pipe): the librespot->ffmpeg PCM pipe broke — typically ffmpeg died
+   * mid-track and librespot's next write hit the closed pipe (EPIPE), or the
+   * stream was destroyed (ERR_STREAM_DESTROYED). Both are expected teardown
+   * signals, not programming errors. Log, tear down cleanly (stop() is
+   * idempotent), then surface via emitError so a listening controller reacts.
+   * Guarded so both stream ends reporting the same break don't double-teardown.
+   */
+  private onPipeError(err: unknown): void {
+    if (this.pipeBroke) return;
+    this.pipeBroke = true;
+    this.log.warn(
+      { err },
+      "rust-librespot: librespot->ffmpeg pipe broke (ffmpeg died?) — tearing down",
+    );
+    this.stop();
+    this.emitError(err);
+  }
+
+  private async waitForDevice(): Promise<void> {
+    const sleep = this.deps.sleep ?? defaultSleep;
+    const interval = this.deps.readyPollIntervalMs ?? DEFAULT_READY_POLL_MS;
+    const timeout = this.deps.readyTimeoutMs ?? DEFAULT_READY_TIMEOUT_MS;
+    const deadline = Date.now() + timeout;
+    while (Date.now() < deadline) {
+      let devices: SpotifyDevice[] = [];
+      try {
+        devices = await this.connect.getDevices();
+      } catch (err) {
+        this.log.debug({ err }, "getDevices failed during readiness poll");
+      }
+      if (devices.some((d) => d.name === this.opts.deviceName)) return;
+      await sleep(interval);
+    }
+    throw new Error(`librespot device "${this.opts.deviceName}" did not appear within timeout`);
+  }
+
+  private startPollLoop(): void {
+    const interval = this.deps.statePollIntervalMs ?? DEFAULT_STATE_POLL_MS;
+    this.pollTimer = setInterval(() => {
+      void this.pollState();
+    }, interval);
+    // Don't keep the event loop / test process alive on account of the poll timer.
+    this.pollTimer.unref?.();
+  }
+
+  /** One player-state poll iteration: updates position/metadata and detects track end. */
+  private async pollState(): Promise<void> {
+    let state: PlaybackState | null;
+    try {
+      state = await this.connect.getPlaybackState();
+    } catch (err) {
+      this.log.debug({ err }, "getPlaybackState failed");
+      return;
+    }
+
+    // C3.4: detection is armed ONLY by our own playTrack(). Until then a poll
+    // must have NO side effects — no metadata/trackEnded emit and no mutation of
+    // currentUri/hasPlayed/positionMs. This single gate covers the null-state
+    // (C3.5 post-play-204) branch, the metadata-emit block, and every end
+    // heuristic below, so a foreign track sitting near its end at startup can
+    // never spuriously advance the queue. (Device-readiness polling via
+    // getDevices is separate and stays active regardless of this flag.)
+    if (!this.armed) return;
+
+    // R4-6: consume the one-poll "just-seeked" grace up front so it spans exactly
+    // ONE poll regardless of which branch this poll takes. `justSeeked` then
+    // suppresses a single finishedByProgress misfire below (a deliberate seek
+    // into the final END_OF_TRACK_WINDOW_MS must not be read as a natural end).
+    const justSeeked = this.seekGrace;
+    this.seekGrace = false;
+
+    if (!state) {
+      // C3.5: a 204 / no-active-device response. AFTER our own track has been
+      // seen playing, librespot going idle means the track ended — emit once so
+      // the queue advances instead of stalling. BEFORE any play (hasPlayed
+      // false), a null state is just "nothing active yet" and is ignored.
+      // C1(pause-skip) residual: while WE hold a self-initiated pause, a long
+      // pause can let the Connect device idle out to 204/null. That is still
+      // "paused", NOT a track end — do nothing this poll, or we'd skip the
+      // paused track. Once resume() clears `paused`, a genuinely-dead device
+      // (persistent null) is detected and skipped on the next poll as before.
+      if (this.hasPlayed && this.currentUri && !this.endedForCurrent && !this.paused) {
+        this.endedForCurrent = true;
+        const endedUri = this.currentUri;
+        this.currentUri = null;
+        this.positionMs = 0;
+        const e: SpotifyTrackEndedEvent = { uri: endedUri, reason: "ended" };
+        this.emit("trackEnded", e);
+      }
+      return;
+    }
+
+    // R4-4 (multi-bot): is the account's single ACTIVE Connect device ours? The
+    // Premium account allows one active playback stream, so if another bot stole
+    // the session, GET /v1/me/player now reports THAT device + its track. Only
+    // when the active device is foreign (we know our id AND the state names a
+    // DIFFERENT active id) do we refuse to treat this poll as our own track:
+    // skip metadata/track-change (so B's now-playing isn't surfaced as ours),
+    // don't advance our position/hasPlayed off foreign playback, and feed the
+    // stop/null two-poll detection so the stolen session cleanly ends OUR track
+    // and advances OUR queue instead of thrashing/misattributing. LENIENT: if
+    // our id is unknown or activeDeviceId is absent we can't tell, so we fall
+    // back to today's behavior byte-for-byte (single-bot: activeDeviceId === ours).
+    const foreignActive =
+      this.deviceId != null &&
+      state.activeDeviceId != null &&
+      state.activeDeviceId !== this.deviceId;
+
+    // Don't misattribute a foreign device's playback position as ours.
+    if (!foreignActive) this.positionMs = state.progressMs;
+
+    // Track change -> reset the end-detection state and surface best-effort
+    // metadata. Skipped entirely when a foreign device is active: its uri is NOT
+    // our track, so adopting it / emitting metadata would surface another bot's
+    // now-playing as ours and later misread that bot's stop as our track's end.
+    if (!foreignActive && state.trackUri && state.trackUri !== this.currentUri) {
+      this.currentUri = state.trackUri;
+      this.hasPlayed = false;
+      this.endedForCurrent = false;
+      this.stopSeen = false; // new track -> drop any pending stop confirmation
+      const np: SpotifyNowPlaying = {
+        uri: state.trackUri,
+        name: "",
+        artist: "",
+        album: "",
+        coverUrl: "",
+        durationMs: state.durationMs,
+      };
+      this.emit("metadata", np);
+    }
+
+    // R4-4: only OUR device actually playing counts as our track playing. When a
+    // foreign device is active, `state.isPlaying` reflects THAT bot's playback,
+    // not ours — so it must not mark hasPlayed or clear the stop confirmation.
+    const ourTrackPlaying = state.isPlaying && !foreignActive;
+    if (ourTrackPlaying) {
+      this.hasPlayed = true;
+      // Real playback observed -> the I4 degrade-to-skip watchdog is moot.
+      this.clearPlaybackWatchdog();
+    }
+    // Clearly playing our track again (is_playing AND a real item) -> any earlier
+    // transient is_playing:false (buffering) or null item (Connect handoff /
+    // market relink) was a hiccup; drop the pending two-poll end confirmation.
+    // A null item under is_playing:true is NOT "clearly playing" and must NOT
+    // reset the confirmation, or a genuine null-item end could never accumulate
+    // its second poll.
+    if (ourTrackPlaying && state.trackUri !== null) {
+      this.stopSeen = false;
+    }
+    if (!this.currentUri || this.endedForCurrent) return;
+
+    // C3.4: EVERY end condition is gated on hasPlayed so no end can fire until
+    // the bot's own track has actually been observed playing. Without this, the
+    // first poll (before playTrack) could observe the account's stale/paused
+    // track sitting near its end and spuriously emit "trackEnded".
+    // m(sub-window): only apply the near-end window when the track is LONGER
+    // than the window. For durationMs in [1, END_OF_TRACK_WINDOW_MS],
+    // `durationMs - window` is negative, so the old `> 0` guard made this
+    // unconditionally true and finished the track on its first poll. A
+    // sub-window track instead relies on normal stop/next-track detection.
+    // C1(pause-skip) residual: a self-initiated pause within the final window
+    // freezes progress at >= dur-window with is_playing:false and the SAME uri;
+    // without `!this.paused` this near-end heuristic would fire and skip the
+    // paused track. resume() clears `paused`, so a genuine natural end is still
+    // detected afterwards.
+    // R4-4: progress/duration under a foreign-active state belong to another
+    // bot's track, so the near-end heuristic must not fire off them. A stolen
+    // session ends OUR track through the stop/null two-poll path below instead.
+    const finishedByProgress =
+      this.hasPlayed &&
+      !this.paused &&
+      !foreignActive &&
+      state.durationMs > END_OF_TRACK_WINDOW_MS &&
+      state.progressMs >= state.durationMs - END_OF_TRACK_WINDOW_MS;
+    // C1(pause-skip) + R3-1(null-item): a self-initiated pause (this.paused)
+    // reports is_playing:false (and can idle to a null item) with the SAME uri —
+    // that is NOT a track end, so never finish while paused. Beyond pause, the
+    // two "not clearly playing our track" signals — an external stop
+    // (is_playing:false) and a null item (trackUri===null) — are BOTH momentary
+    // at the boundaries (buffering; Connect handoff / market relink), so they
+    // share ONE two-poll confirmation (stopSeen): require the signal to persist
+    // across two consecutive non-paused polls before ending. A single transient
+    // stop OR null is absorbed; a confirmed end still emits within ~one extra
+    // poll interval, and a genuine end (item stays null / stopped across two
+    // polls) still fires exactly once.
+    // R4-4: a foreign device becoming the active one means OUR device is no
+    // longer playing our track — the same signal as an external stop / null
+    // item, so it shares the two-poll confirmation: one foreign poll is
+    // unconfirmed (could be a transient handoff), two consecutive foreign polls
+    // cleanly end our track and advance our queue.
+    let finishedByStopOrNull = false;
+    if (
+      this.hasPlayed &&
+      !this.paused &&
+      (foreignActive || !state.isPlaying || state.trackUri === null)
+    ) {
+      if (this.stopSeen) {
+        finishedByStopOrNull = true;
+      } else {
+        this.stopSeen = true; // first such poll — await confirmation
+      }
+    }
+
+    // R4-6: a deliberate seek into the near-end window suppresses this single
+    // finishedByProgress. `justSeeked` was already consumed above, so the NEXT
+    // in-window poll finishes normally — the grace never permanently disables
+    // near-end detection, and it never touches the stop/null two-poll path.
+    if ((finishedByProgress && !justSeeked) || finishedByStopOrNull) {
+      this.endedForCurrent = true; // latch: emit at most once per track
+      const endedUri = this.currentUri;
+      this.currentUri = null;
+      this.positionMs = 0;
+      const e: SpotifyTrackEndedEvent = { uri: endedUri, reason: "ended" };
+      this.emit("trackEnded", e);
+    }
+  }
+
+  isReady(): boolean {
+    return this.ready;
+  }
+
+  async playTrack(uri: string): Promise<void> {
+    const deviceId = await this.connect.findDeviceByName(this.opts.deviceName);
+    if (!deviceId) throw new Error(`Connect device "${this.opts.deviceName}" not found`);
+    // R4-4: persist OUR device id so control (pause/resume/seek) is device-scoped
+    // and pollState can distinguish our device from a foreign one that stole the
+    // shared account's single active Connect session.
+    this.deviceId = deviceId;
+    // Reset the track-end state machine for the new track: clear the once-only
+    // latch and drop hasPlayed so no end can fire until a poll re-confirms this
+    // uri playing. currentUri is cleared so the next poll re-detects the track
+    // (fresh metadata) rather than treating it as unchanged. Arming here is the
+    // primary guarantee that no end/metadata can fire before the bot plays.
+    // Cancel the previous track's degrade-to-skip watchdog first (at-most-one
+    // trackEnded per track, I4).
+    this.clearPlaybackWatchdog();
+    this.currentUri = null;
+    this.hasPlayed = false;
+    this.endedForCurrent = false;
+    this.armed = true;
+    // A newly-started track is not paused, and carries no pending stop
+    // confirmation from the previous track. (C1 pause-skip.)
+    this.paused = false;
+    this.stopSeen = false;
+    // R4-6: a fresh track carries no pending seek grace from the previous one.
+    this.seekGrace = false;
+    // transfer(false) activates our device WITHOUT starting audio; play() then
+    // actually starts the uri. The two-step is required — transfer alone won't
+    // begin playback.
+    await this.connect.transfer(deviceId, false);
+    await this.connect.play(deviceId, uri);
+    // I4 (§13): arm the "did it actually start playing?" watchdog. If our own
+    // track is never seen playing within the window, degrade-to-skipped so the
+    // queue advances instead of hanging on a silent, persistently-failing play.
+    this.armPlaybackWatchdog(uri);
+  }
+
+  /**
+   * I4 (§13) degrade-to-skip watchdog. Arms a bounded timer; if our own track
+   * has not been observed playing by the time it fires, emit a single
+   * trackEnded{reason:"error"} so the controller re-emits it and BotInstance
+   * advances the queue. Cleared when real playback is observed, on stop(), and
+   * at the start of a new playTrack().
+   */
+  private armPlaybackWatchdog(uri: string): void {
+    this.clearPlaybackWatchdog();
+    const timeoutMs = this.deps.playbackStartTimeoutMs ?? DEFAULT_PLAYBACK_START_TIMEOUT_MS;
+    const setTimer =
+      this.deps.setTimeout ??
+      ((cb: () => void, ms: number) => {
+        const t = setTimeout(cb, ms);
+        (t as { unref?: () => void }).unref?.();
+        return t;
+      });
+    this.watchdogTimer = setTimer(() => {
+      this.watchdogTimer = null;
+      this.onPlaybackStartTimeout(uri);
+    }, timeoutMs);
+  }
+
+  private clearPlaybackWatchdog(): void {
+    if (this.watchdogTimer == null) return;
+    const clearTimer =
+      this.deps.clearTimeout ??
+      ((h: unknown) => clearTimeout(h as ReturnType<typeof setTimeout>));
+    clearTimer(this.watchdogTimer);
+    this.watchdogTimer = null;
+  }
+
+  /**
+   * Fired when the playback-start window elapses with no observed playback.
+   * C3.6: never throws up the queue path. Guarded by the same endedForCurrent
+   * latch as normal end-detection so at most one trackEnded per track (no
+   * double-emit with the poll-loop end detection).
+   */
+  private onPlaybackStartTimeout(uri: string): void {
+    // Real playback was seen (hasPlayed) or the track already ended -> moot.
+    if (this.hasPlayed || this.endedForCurrent) return;
+    this.endedForCurrent = true; // latch
+    this.currentUri = null;
+    this.positionMs = 0;
+    const e: SpotifyTrackEndedEvent = { uri, reason: "error" };
+    this.emit("trackEnded", e);
+  }
+
+  async pause(): Promise<void> {
+    // R4-4: device-scope to OUR device so bot A's pause / auto-pause-when-alone
+    // can't pause whatever device is currently active for the shared account
+    // (= bot B's playback). Falls back to account-wide only before first play.
+    await this.connect.pause(this.deviceId ?? undefined);
+    // C1(pause-skip): mark our own pause so the next poll's is_playing:false
+    // (same uri) is not misread as a track end and skipped.
+    this.paused = true;
+  }
+
+  async resume(): Promise<void> {
+    // R4-4: device-scope to OUR device (see pause()).
+    await this.connect.resume(this.deviceId ?? undefined);
+    // Resumed -> normal end-detection applies again.
+    this.paused = false;
+  }
+
+  async seek(ms: number): Promise<void> {
+    // R4-4: device-scope to OUR device (see pause()).
+    await this.connect.seek(ms, this.deviceId ?? undefined);
+    this.positionMs = ms;
+    // R4-6: arm the one-poll grace so a seek landing inside the final
+    // END_OF_TRACK_WINDOW_MS is not immediately treated as a natural end.
+    this.seekGrace = true;
+  }
+
+  getPcmStream(): Readable {
+    const out = this.ffmpeg?.stdout;
+    if (!out) throw new Error("PCM stream unavailable (rust-librespot backend not started)");
+    return out;
+  }
+
+  getPositionMs(): number {
+    return this.positionMs;
+  }
+
+  stop(): void {
+    this.ready = false;
+    // Disarm the I4 degrade-to-skip watchdog so a stopped backend never emits.
+    this.clearPlaybackWatchdog();
+    // Clear the state poll interval FIRST so no poll fires mid-teardown.
+    if (this.pollTimer) {
+      clearInterval(this.pollTimer);
+      this.pollTimer = null;
+    }
+    if (this.proc) {
+      try {
+        this.proc.kill();
+      } catch {
+        /* ignore */
+      }
+      this.proc = null;
+    }
+    if (this.ffmpeg) {
+      try {
+        this.ffmpeg.kill();
+      } catch {
+        /* ignore */
+      }
+      this.ffmpeg = null;
+    }
+  }
+}

src/music/spotify/spotify-oauth.test.ts

@@ -0,0 +1,587 @@
+import { describe, it, expect, beforeEach, afterEach, vi } from "vitest";
+import {
+  mkdtempSync,
+  rmSync,
+  readdirSync,
+  readFileSync,
+  renameSync,
+  statSync,
+} from "node:fs";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+import {
+  SpotifyOAuth,
+  SPOTIFY_CONTROL_SCOPES,
+  generateCodeVerifier,
+  codeChallengeS256,
+  createFileOAuthTokenStore,
+  type OAuthTokens,
+  type OAuthTokenStore,
+} from "./spotify-oauth.js";
+
+// Wrap the fs functions the token store uses in call-through spies so the
+// atomic-write path (temp file + rename) can be observed/forced. Everything else
+// (mkdtemp, rmSync, readdir, …) is the real implementation via `...actual`, so
+// all other tests keep real filesystem behavior. `vi.spyOn` can't be used here
+// because the node:fs ESM namespace is non-configurable in this setup.
+vi.mock("node:fs", async (importOriginal) => {
+  const actual = await importOriginal<typeof import("node:fs")>();
+  return {
+    ...actual,
+    writeFileSync: vi.fn(actual.writeFileSync),
+    renameSync: vi.fn(actual.renameSync),
+  };
+});
+
+// Correction C3.2: the control OAuth REQUIRES a user-provided client_id (their
+// own Spotify Developer app) + caller-supplied loopback redirect. There is NO
+// librespot public-client / :5588 default.
+const CLIENT_ID = "test-client-id";
+const REDIRECT_URI = "http://127.0.0.1:8888/api/spotify/callback";
+
+/** In-memory store exposing `.value` so tests can assert persistence. */
+function memStore(
+  initial: OAuthTokens | null = null,
+): OAuthTokenStore & { value: OAuthTokens | null } {
+  const s = {
+    value: initial,
+    load() {
+      return s.value;
+    },
+    save(t: OAuthTokens) {
+      s.value = t;
+    },
+    clear() {
+      s.value = null;
+    },
+  };
+  return s;
+}
+
+/** A manually-settled promise, to hold a token POST "in flight" during a test. */
+function deferred<T>() {
+  let resolve!: (v: T) => void;
+  let reject!: (e: unknown) => void;
+  const promise = new Promise<T>((res, rej) => {
+    resolve = res;
+    reject = rej;
+  });
+  return { promise, resolve, reject };
+}
+
+describe("PKCE helpers", () => {
+  it("generateCodeVerifier returns 64 chars from the unreserved set", () => {
+    const v = generateCodeVerifier();
+    expect(v).toHaveLength(64);
+    expect(v).toMatch(/^[A-Za-z0-9\-._~]{64}$/);
+    expect(generateCodeVerifier()).not.toBe(v); // random
+  });
+
+  it("codeChallengeS256 is base64url(sha256) with no padding (43 chars)", () => {
+    const c = codeChallengeS256("abc123");
+    expect(c).toHaveLength(43); // 32-byte digest -> 43 base64url chars
+    expect(c).not.toContain("=");
+    expect(c).toMatch(/^[A-Za-z0-9_-]+$/);
+  });
+});
+
+describe("SpotifyOAuth.buildAuthorizeUrl", () => {
+  it("builds accounts.spotify.com/authorize with the caller's clientId + redirectUri + S256", () => {
+    const oauth = new SpotifyOAuth({
+      clientId: CLIENT_ID,
+      redirectUri: REDIRECT_URI,
+      store: memStore(),
+    });
+    const { url, state } = oauth.buildAuthorizeUrl();
+    const u = new URL(url);
+    expect(u.origin + u.pathname).toBe("https://accounts.spotify.com/authorize");
+    const p = u.searchParams;
+    expect(p.get("client_id")).toBe(CLIENT_ID);
+    expect(p.get("response_type")).toBe("code");
+    expect(p.get("redirect_uri")).toBe(REDIRECT_URI);
+    expect(p.get("code_challenge_method")).toBe("S256");
+    expect(p.get("code_challenge")).toHaveLength(43);
+    expect(p.get("scope")).toBe(SPOTIFY_CONTROL_SCOPES);
+    expect(p.get("state")).toBe(state);
+    expect(state).toMatch(/^[0-9a-f]{32}$/);
+    expect(oauth.getClientId()).toBe(CLIENT_ID);
+    expect(oauth.getRedirectUri()).toBe(REDIRECT_URI);
+  });
+
+  // Correction C3.2: no clientId => cannot start OAuth; throw a clear message.
+  it("throws a clear error when clientId is empty", () => {
+    const oauth = new SpotifyOAuth({ redirectUri: REDIRECT_URI, store: memStore() });
+    expect(() => oauth.buildAuthorizeUrl()).toThrow(/Client ID/i);
+  });
+});
+
+describe("SpotifyOAuth.isAuthorized (C3.2)", () => {
+  it("is false without a clientId even if a refresh token is stored", () => {
+    const store = memStore({
+      accessToken: "a",
+      refreshToken: "r",
+      expiresAt: Date.now() + 60_000,
+      scope: "s",
+    });
+    const oauth = new SpotifyOAuth({ redirectUri: REDIRECT_URI, store });
+    expect(oauth.isAuthorized()).toBe(false);
+  });
+
+  it("is true with a clientId and a stored refresh token", () => {
+    const store = memStore({
+      accessToken: "a",
+      refreshToken: "r",
+      expiresAt: Date.now() + 60_000,
+      scope: "s",
+    });
+    const oauth = new SpotifyOAuth({ clientId: CLIENT_ID, store });
+    expect(oauth.isAuthorized()).toBe(true);
+  });
+});
+
+describe("SpotifyOAuth.handleCallback", () => {
+  it("exchanges the code (PKCE verifier matches the authorize challenge) and persists tokens", async () => {
+    const store = memStore();
+    const http = {
+      post: vi.fn().mockResolvedValue({
+        data: {
+          access_token: "a1",
+          refresh_token: "r1",
+          expires_in: 3600,
+          scope: SPOTIFY_CONTROL_SCOPES,
+        },
+      }),
+    } as any;
+    const oauth = new SpotifyOAuth({
+      clientId: CLIENT_ID,
+      redirectUri: REDIRECT_URI,
+      store,
+      deps: { http },
+    });
+
+    const { url, state } = oauth.buildAuthorizeUrl();
+    const challenge = new URL(url).searchParams.get("code_challenge")!;
+
+    const ok = await oauth.handleCallback("CODE123", state);
+    expect(ok).toBe(true);
+
+    const [path, bodyStr, cfg] = http.post.mock.calls[0];
+    expect(path).toBe("/api/token");
+    expect(cfg.headers["Content-Type"]).toBe("application/x-www-form-urlencoded");
+    const body = new URLSearchParams(bodyStr as string);
+    expect(body.get("grant_type")).toBe("authorization_code");
+    expect(body.get("code")).toBe("CODE123");
+    expect(body.get("redirect_uri")).toBe(REDIRECT_URI);
+    expect(body.get("client_id")).toBe(CLIENT_ID);
+    // The verifier sent MUST hash to the challenge advertised in the authorize URL.
+    const verifier = body.get("code_verifier")!;
+    expect(codeChallengeS256(verifier)).toBe(challenge);
+
+    expect(store.value?.accessToken).toBe("a1");
+    expect(store.value?.refreshToken).toBe("r1");
+    expect(store.value?.expiresAt).toBeGreaterThan(Date.now());
+    expect(oauth.isAuthorized()).toBe(true);
+  });
+
+  it("rejects an unknown state without calling the token endpoint (CSRF guard)", async () => {
+    const http = { post: vi.fn() } as any;
+    const oauth = new SpotifyOAuth({
+      clientId: CLIENT_ID,
+      redirectUri: REDIRECT_URI,
+      store: memStore(),
+      deps: { http },
+    });
+    expect(await oauth.handleCallback("CODE", "not-a-real-state")).toBe(false);
+    expect(http.post).not.toHaveBeenCalled();
+  });
+
+  // Correction C3.7: the state->verifier entry is deleted on EVERY terminal
+  // path (finally), so a failed login never leaks it and cannot be replayed.
+  it("deletes the pending verifier even when the token exchange fails", async () => {
+    const http = {
+      post: vi.fn().mockRejectedValue({
+        response: { status: 400, data: { error: "invalid_grant" } },
+      }),
+    } as any;
+    const oauth = new SpotifyOAuth({
+      clientId: CLIENT_ID,
+      redirectUri: REDIRECT_URI,
+      store: memStore(),
+      deps: { http },
+    });
+    const { state } = oauth.buildAuthorizeUrl();
+
+    // First attempt fails at the network/token step.
+    expect(await oauth.handleCallback("CODE", state)).toBe(false);
+    expect(http.post).toHaveBeenCalledTimes(1);
+
+    // Replaying the same state now fails the CSRF guard (verifier was deleted),
+    // WITHOUT hitting the token endpoint again.
+    expect(await oauth.handleCallback("CODE", state)).toBe(false);
+    expect(http.post).toHaveBeenCalledTimes(1);
+  });
+});
+
+describe("SpotifyOAuth.getAccessToken", () => {
+  it("returns the cached token without refreshing when still valid", async () => {
+    const http = { post: vi.fn() } as any;
+    const store = memStore({
+      accessToken: "cached",
+      refreshToken: "r1",
+      expiresAt: Date.now() + 60_000,
+      scope: "s",
+    });
+    const oauth = new SpotifyOAuth({ clientId: CLIENT_ID, store, deps: { http } });
+    expect(await oauth.getAccessToken()).toBe("cached");
+    expect(http.post).not.toHaveBeenCalled();
+  });
+
+  it("refreshes when expired and persists the ROTATED refresh token", async () => {
+    const store = memStore({
+      accessToken: "old",
+      refreshToken: "r1",
+      expiresAt: Date.now() - 1000,
+      scope: "s",
+    });
+    const http = {
+      post: vi.fn().mockResolvedValue({
+        data: { access_token: "a2", refresh_token: "r2", expires_in: 3600 },
+      }),
+    } as any;
+    const oauth = new SpotifyOAuth({ clientId: CLIENT_ID, store, deps: { http } });
+
+    expect(await oauth.getAccessToken()).toBe("a2");
+    const body = new URLSearchParams(http.post.mock.calls[0][1] as string);
+    expect(body.get("grant_type")).toBe("refresh_token");
+    expect(body.get("refresh_token")).toBe("r1");
+    expect(body.get("client_id")).toBe(CLIENT_ID);
+    expect(store.value?.refreshToken).toBe("r2"); // rotated + persisted
+    expect(store.value?.accessToken).toBe("a2");
+  });
+
+  it("keeps the old refresh token when the refresh response omits a new one", async () => {
+    const store = memStore({
+      accessToken: "old",
+      refreshToken: "r1",
+      expiresAt: Date.now() - 1000,
+      scope: "s",
+    });
+    const http = {
+      post: vi.fn().mockResolvedValue({ data: { access_token: "a2", expires_in: 3600 } }),
+    } as any;
+    const oauth = new SpotifyOAuth({ clientId: CLIENT_ID, store, deps: { http } });
+    expect(await oauth.getAccessToken()).toBe("a2");
+    expect(store.value?.refreshToken).toBe("r1");
+  });
+
+  it("clears the store and returns null on invalid_grant (expired refresh token)", async () => {
+    const store = memStore({
+      accessToken: "old",
+      refreshToken: "r1",
+      expiresAt: Date.now() - 1000,
+      scope: "s",
+    });
+    const http = {
+      post: vi.fn().mockRejectedValue({
+        response: { status: 400, data: { error: "invalid_grant" } },
+      }),
+    } as any;
+    const oauth = new SpotifyOAuth({ clientId: CLIENT_ID, store, deps: { http } });
+    expect(await oauth.getAccessToken()).toBeNull();
+    expect(store.value).toBeNull();
+    expect(oauth.isAuthorized()).toBe(false);
+  });
+
+  it("returns null when unauthorized (no stored refresh token)", async () => {
+    const http = { post: vi.fn() } as any;
+    const oauth = new SpotifyOAuth({
+      clientId: CLIENT_ID,
+      store: memStore(),
+      deps: { http },
+    });
+    expect(await oauth.getAccessToken()).toBeNull();
+    expect(oauth.isAuthorized()).toBe(false);
+    expect(http.post).not.toHaveBeenCalled();
+  });
+});
+
+// S4.3: refresh-token rotation makes two concurrent refreshes race — the second
+// would POST with a token the first already invalidated. Collapse them into one.
+describe("SpotifyOAuth.getAccessToken (in-flight refresh, S4.3)", () => {
+  it("collapses concurrent refreshes into a single token POST", async () => {
+    let t = 0;
+    const now = () => t;
+    const store = memStore({
+      accessToken: "old",
+      refreshToken: "r1",
+      expiresAt: 0, // now()=0 is not < 0 -> expired -> must refresh
+      scope: "s",
+    });
+    const d = deferred<any>();
+    const http = { post: vi.fn().mockReturnValue(d.promise) } as any;
+    const oauth = new SpotifyOAuth({
+      clientId: CLIENT_ID,
+      store,
+      deps: { http, now },
+    });
+
+    // Fire two calls while the POST is still pending.
+    const p1 = oauth.getAccessToken();
+    const p2 = oauth.getAccessToken();
+    expect(http.post).toHaveBeenCalledTimes(1); // collapsed to ONE POST
+
+    d.resolve({
+      data: { access_token: "a2", refresh_token: "r2", expires_in: 3600 },
+    });
+    expect(await p1).toBe("a2");
+    expect(await p2).toBe("a2");
+    expect(http.post).toHaveBeenCalledTimes(1);
+    expect(store.value?.refreshToken).toBe("r2"); // rotated once, not twice
+  });
+
+  it("clears the in-flight refresh after it settles, allowing a later refresh", async () => {
+    let t = 0;
+    const now = () => t;
+    const store = memStore({
+      accessToken: "old",
+      refreshToken: "r1",
+      expiresAt: 0,
+      scope: "s",
+    });
+    const http = {
+      post: vi
+        .fn()
+        .mockResolvedValueOnce({
+          data: { access_token: "a2", refresh_token: "r2", expires_in: 3600 },
+        })
+        .mockResolvedValueOnce({
+          data: { access_token: "a3", refresh_token: "r3", expires_in: 3600 },
+        }),
+    } as any;
+    const oauth = new SpotifyOAuth({
+      clientId: CLIENT_ID,
+      store,
+      deps: { http, now },
+    });
+
+    expect(await oauth.getAccessToken()).toBe("a2");
+    expect(http.post).toHaveBeenCalledTimes(1);
+
+    // toTokens now uses this.now(): saved expiresAt = 0 + 3600s - 30s skew.
+    // Still valid at t=0 -> cached, no new POST.
+    expect(await oauth.getAccessToken()).toBe("a2");
+    expect(http.post).toHaveBeenCalledTimes(1);
+
+    // Advance past the newly-saved expiry -> in-flight was cleared, so a fresh
+    // refresh fires (proves .finally() reset refreshInFlight).
+    t = 3600 * 1000;
+    expect(await oauth.getAccessToken()).toBe("a3");
+    expect(http.post).toHaveBeenCalledTimes(2);
+    expect(store.value?.refreshToken).toBe("r3");
+  });
+});
+
+// S4.3: bound the PKCE verifier map so abandoned logins can't accumulate.
+describe("SpotifyOAuth PKCE verifier TTL + cap (S4.3)", () => {
+  it("expires a pending verifier after the TTL (handleCallback returns false)", async () => {
+    let t = 0;
+    const now = () => t;
+    const http = { post: vi.fn() } as any;
+    const oauth = new SpotifyOAuth({
+      clientId: CLIENT_ID,
+      redirectUri: REDIRECT_URI,
+      store: memStore(),
+      deps: { http, now },
+    });
+    const { state } = oauth.buildAuthorizeUrl();
+
+    t = 10 * 60 * 1000 + 1; // VERIFIER_TTL_MS + 1
+    expect(await oauth.handleCallback("CODE", state)).toBe(false);
+    expect(http.post).not.toHaveBeenCalled(); // never reached the token step
+  });
+
+  it("caps the verifier map, evicting the oldest state (behavioral)", async () => {
+    let t = 0;
+    const now = () => t;
+    const http = {
+      post: vi.fn().mockResolvedValue({
+        data: { access_token: "a1", refresh_token: "r1", expires_in: 3600 },
+      }),
+    } as any;
+    const oauth = new SpotifyOAuth({
+      clientId: CLIENT_ID,
+      redirectUri: REDIRECT_URI,
+      store: memStore(),
+      deps: { http, now },
+    });
+
+    // First (oldest) state, then enough more to exceed VERIFIER_MAX (32).
+    const first = oauth.buildAuthorizeUrl().state;
+    let last = first;
+    for (let i = 0; i < 32; i++) last = oauth.buildAuthorizeUrl().state;
+
+    // The oldest was evicted -> unknown state -> CSRF guard, no token POST.
+    expect(await oauth.handleCallback("CODE", first)).toBe(false);
+    expect(http.post).not.toHaveBeenCalled();
+
+    // A still-pending (newest) state DOES resolve -> only the oldest was dropped.
+    expect(await oauth.handleCallback("CODE", last)).toBe(true);
+    expect(http.post).toHaveBeenCalledTimes(1);
+  });
+});
+
+// Whole-branch I2: a UI-entered Client ID (saved in Settings) must reach the
+// single live SpotifyOAuth WITHOUT a process restart. configure() re-arms the
+// runtime credentials; an empty clientId re-disables OAuth.
+describe("SpotifyOAuth.configure (runtime credentials, whole-branch I2)", () => {
+  it("applies a UI-entered clientId + redirectUri so OAuth arms without a restart", () => {
+    // Fresh install: boot-time config had no clientId, so OAuth is disabled.
+    const store = memStore({
+      accessToken: "a",
+      refreshToken: "r",
+      expiresAt: Date.now() + 60_000,
+      scope: "s",
+    });
+    const oauth = new SpotifyOAuth({ clientId: "", store });
+    expect(oauth.isAuthorized()).toBe(false);
+    expect(() => oauth.buildAuthorizeUrl()).toThrow(/Client ID/i);
+
+    // Operator enters creds in Settings -> POST /settings calls configure().
+    const REDIRECT = "http://127.0.0.1:3000/api/spotify/callback";
+    oauth.configure("cid", REDIRECT);
+    expect(oauth.getClientId()).toBe("cid");
+    expect(oauth.getRedirectUri()).toBe(REDIRECT);
+    // Now authorize + isAuthorized work against the newly-supplied app.
+    expect(oauth.isAuthorized()).toBe(true);
+    const { url } = oauth.buildAuthorizeUrl();
+    const p = new URL(url).searchParams;
+    expect(p.get("client_id")).toBe("cid");
+    expect(p.get("redirect_uri")).toBe(REDIRECT);
+  });
+
+  it("trims the clientId and re-disables OAuth when cleared", () => {
+    const oauth = new SpotifyOAuth({
+      clientId: "old",
+      redirectUri: "http://old",
+      store: memStore(),
+    });
+    oauth.configure("  cid  ", "http://127.0.0.1:3000/api/spotify/callback");
+    expect(oauth.getClientId()).toBe("cid"); // trimmed
+
+    // Empty clientId disables OAuth again (gate on buildAuthorizeUrl/isAuthorized).
+    oauth.configure("");
+    expect(oauth.getClientId()).toBe("");
+    expect(oauth.getRedirectUri()).toBe("");
+    expect(oauth.isAuthorized()).toBe(false);
+    expect(() => oauth.buildAuthorizeUrl()).toThrow(/Client ID/i);
+  });
+});
+
+describe("createFileOAuthTokenStore", () => {
+  it("round-trips save/load and clear() removes it", () => {
+    const dir = mkdtempSync(join(tmpdir(), "sp-oauth-"));
+    const file = join(dir, "nested", "tokens.json");
+    try {
+      const store = createFileOAuthTokenStore(file);
+      expect(store.load()).toBeNull(); // missing file
+      const t: OAuthTokens = {
+        accessToken: "a",
+        refreshToken: "r",
+        expiresAt: 123,
+        scope: "s",
+      };
+      store.save(t);
+      expect(store.load()).toEqual(t);
+      store.clear();
+      expect(store.load()).toBeNull();
+    } finally {
+      rmSync(dir, { recursive: true, force: true });
+    }
+  });
+});
+
+// R3-5: the token store save() must be atomic (same-dir temp file + rename), so
+// a crash / power loss / ENOSPC while persisting a ROTATED refresh token (Spotify
+// invalidates the OLD one the instant it responds — the new one lives only in
+// memory until this write lands) can never truncate the file and silently
+// de-authenticate the operator. Mirrors the hardened config.ts saveConfig.
+describe("createFileOAuthTokenStore atomic write (R3-5)", () => {
+  const dirs: string[] = [];
+  function makeTmpDir(): string {
+    const dir = mkdtempSync(join(tmpdir(), "sp-oauth-atomic-"));
+    dirs.push(dir);
+    return dir;
+  }
+  beforeEach(() => {
+    vi.clearAllMocks(); // reset call history, keep the call-through implementations
+  });
+  afterEach(() => {
+    for (const d of dirs) rmSync(d, { recursive: true, force: true });
+    dirs.length = 0;
+  });
+
+  const TOK: OAuthTokens = {
+    accessToken: "a",
+    refreshToken: "r",
+    expiresAt: 123,
+    scope: "s",
+  };
+
+  it("round-trips save/load and leaves NO .tmp file behind", () => {
+    const dir = makeTmpDir();
+    const file = join(dir, "tokens.json");
+    const store = createFileOAuthTokenStore(file);
+
+    store.save(TOK);
+
+    expect(store.load()).toEqual(TOK);
+    // No temp remnants in the target directory.
+    expect(readdirSync(dir).filter((f) => f.includes(".tmp"))).toEqual([]);
+  });
+
+  it("writes via a same-dir temp file then renameSync onto the final path", () => {
+    const dir = makeTmpDir();
+    const file = join(dir, "tokens.json");
+
+    createFileOAuthTokenStore(file).save(TOK);
+
+    expect(vi.mocked(renameSync)).toHaveBeenCalled();
+    const [from, to] = vi.mocked(renameSync).mock.calls[0] as [string, string];
+    expect(to).toBe(file); // renamed ONTO the real path
+    expect(String(from)).not.toBe(file); // ...from a distinct temp file
+    expect(join(String(from), "..")).toBe(join(file, "..")); // ...in the SAME dir
+  });
+
+  it("persists the token file with 0600 permissions (POSIX)", () => {
+    if (process.platform === "win32") return; // mode bits aren't meaningful on Windows
+    const dir = makeTmpDir();
+    const file = join(dir, "tokens.json");
+    createFileOAuthTokenStore(file).save(TOK);
+    expect(statSync(file).mode & 0o777).toBe(0o600);
+  });
+
+  it("does NOT truncate/corrupt a pre-existing valid token file when the write fails mid-way", () => {
+    const dir = makeTmpDir();
+    const file = join(dir, "tokens.json");
+    const store = createFileOAuthTokenStore(file);
+
+    // A valid, previously-persisted token file (the live refresh token on disk).
+    store.save(TOK);
+    const before = readFileSync(file, "utf-8");
+
+    // Simulate a crash / ENOSPC at the atomic-replace step while persisting a
+    // ROTATED refresh token.
+    const rotated: OAuthTokens = { ...TOK, accessToken: "a2", refreshToken: "r2" };
+    vi.mocked(renameSync).mockImplementationOnce(() => {
+      throw new Error("rename boom");
+    });
+
+    expect(() => store.save(rotated)).toThrow(/rename boom/);
+
+    // The original file is untouched: present, byte-identical, still parseable.
+    expect(readFileSync(file, "utf-8")).toBe(before);
+    expect(store.load()).toEqual(TOK);
+    // ...and the failed write left no temp file lying around.
+    expect(readdirSync(dir).filter((f) => f.includes(".tmp"))).toEqual([]);
+  });
+});

src/music/spotify/spotify-oauth.ts

@@ -0,0 +1,298 @@
+import axios, { type AxiosInstance } from "axios";
+import { createHash, randomBytes } from "node:crypto";
+import {
+  existsSync,
+  mkdirSync,
+  readFileSync,
+  renameSync,
+  rmSync,
+  writeFileSync,
+} from "node:fs";
+import { dirname } from "node:path";
+
+/**
+ * Player-control scopes requested for the USER token: streaming (drives
+ * librespot as a Connect device) + read/modify playback + currently-playing +
+ * private-playlist reads.
+ */
+export const SPOTIFY_CONTROL_SCOPES =
+  "streaming user-read-playback-state user-modify-playback-state user-read-currently-playing playlist-read-private";
+
+const ACCOUNTS_BASE = "https://accounts.spotify.com";
+// Hand a token back only if it survives ~30s, matching webapi.ts's skew.
+const EXPIRY_SKEW_MS = 30_000;
+// RFC 7636 §4.1 unreserved set: [A-Za-z0-9-._~].
+const PKCE_CHARS =
+  "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-._~";
+const FORM_HEADERS = { "Content-Type": "application/x-www-form-urlencoded" };
+
+export interface OAuthTokens {
+  accessToken: string;
+  refreshToken: string;
+  expiresAt: number;
+  scope: string;
+}
+
+export interface OAuthTokenStore {
+  load(): OAuthTokens | null;
+  save(t: OAuthTokens): void;
+  clear(): void;
+}
+
+export interface SpotifyOAuthOptions {
+  /**
+   * Correction C3.2: the caller's OWN Spotify Developer app client_id. There is
+   * no librespot-public-client fallback — an empty clientId disables OAuth.
+   */
+  clientId?: string;
+  /**
+   * Loopback redirect registered on the caller's Spotify app, supplied by the
+   * bot's web layer (e.g. its `/api/spotify/callback`). Must exactly match the
+   * value used at both the authorize and token steps.
+   */
+  redirectUri?: string;
+  store: OAuthTokenStore;
+  deps?: { http?: AxiosInstance; now?: () => number };
+}
+
+/** 64 random chars from the PKCE unreserved set (43-128 allowed by the spec). */
+export function generateCodeVerifier(): string {
+  const bytes = randomBytes(64);
+  let out = "";
+  for (let i = 0; i < 64; i++) out += PKCE_CHARS[bytes[i] % PKCE_CHARS.length];
+  return out;
+}
+
+/** base64url(SHA256(verifier)) with no padding — the S256 code challenge. */
+export function codeChallengeS256(verifier: string): string {
+  return createHash("sha256").update(verifier).digest("base64url");
+}
+
+/** Persist OAuth tokens as a 0600 JSON file (used by the controller). */
+export function createFileOAuthTokenStore(filePath: string): OAuthTokenStore {
+  return {
+    load() {
+      try {
+        if (!existsSync(filePath)) return null;
+        const parsed = JSON.parse(readFileSync(filePath, "utf8"));
+        return parsed?.refreshToken ? (parsed as OAuthTokens) : null;
+      } catch {
+        return null; // missing/corrupt -> treat as unauthorized
+      }
+    },
+    save(t: OAuthTokens) {
+      mkdirSync(dirname(filePath), { recursive: true });
+      // Atomic write: serialize to a sibling temp file in the SAME directory,
+      // then rename it onto the final path. rename is an atomic replace on POSIX
+      // and modern Windows, so a crash / power loss / ENOSPC mid-write can never
+      // leave the token file truncated — a reader always sees either the previous
+      // file or the fully-written new one, never a partial. This matters because
+      // refresh() persists a ROTATED refresh token here: Spotify invalidates the
+      // OLD one the instant it responds, so a torn write would silently
+      // de-authenticate the operator (next load() JSON.parse-fails -> null ->
+      // full PKCE re-login). Mirrors config.ts saveConfig. The temp lives in the
+      // same dir so the rename stays on one filesystem; pid + timestamp keep
+      // concurrent writers from colliding on the temp name. 0600 is preserved.
+      const tmp = `${filePath}.${process.pid}.${Date.now()}.tmp`;
+      try {
+        writeFileSync(tmp, JSON.stringify(t, null, 2), { mode: 0o600 });
+        renameSync(tmp, filePath);
+      } catch (err) {
+        // Never leave a partial temp file behind on failure.
+        try {
+          rmSync(tmp, { force: true });
+        } catch {
+          /* best-effort cleanup */
+        }
+        throw err;
+      }
+    },
+    clear() {
+      try {
+        rmSync(filePath, { force: true });
+      } catch {
+        /* already gone */
+      }
+    },
+  };
+}
+
+/**
+ * Authorization Code + PKCE flow for the USER player-control token. Public
+ * client (no secret).
+ *
+ * Correction C3.2: this REQUIRES the operator's own registered Spotify app —
+ * there is NO reuse of librespot's first-party keymaster client / fixed
+ * :5588 redirect. Without a clientId, `isAuthorized()` is false and
+ * `buildAuthorizeUrl()` throws.
+ *
+ * Refresh rotates the refresh token, so the newest is always persisted;
+ * invalid_grant clears the store (re-login required). Access/refresh tokens
+ * are never logged.
+ */
+export class SpotifyOAuth {
+  private clientId: string;
+  private redirectUri: string;
+  private store: OAuthTokenStore;
+  private http: AxiosInstance;
+  // Injectable clock (tests drive a mutable now); defaults to Date.now.
+  private now: () => number;
+  // Pending PKCE verifiers keyed by state, awaiting the loopback redirect back.
+  private pendingVerifiers = new Map<
+    string,
+    { verifier: string; expiresAt: number }
+  >();
+  // A verifier is abandoned if the redirect never returns; drop it after TTL and
+  // cap the map so parallel logins can't grow it without bound.
+  private static readonly VERIFIER_TTL_MS = 10 * 60 * 1000;
+  private static readonly VERIFIER_MAX = 32;
+  // Collapse concurrent refreshes into one POST (rotation invalidates the token
+  // a second in-flight refresh would send); cleared in .finally().
+  private refreshInFlight: Promise<string | null> | null = null;
+
+  constructor(o: SpotifyOAuthOptions) {
+    this.clientId = o.clientId ?? "";
+    this.redirectUri = o.redirectUri ?? "";
+    this.store = o.store;
+    this.http =
+      o.deps?.http ?? axios.create({ baseURL: ACCOUNTS_BASE, timeout: 15_000 });
+    this.now = o.deps?.now ?? (() => Date.now());
+  }
+
+  private evictStaleVerifiers(): void {
+    const t = this.now();
+    for (const [state, e] of this.pendingVerifiers) {
+      if (e.expiresAt < t) this.pendingVerifiers.delete(state);
+    }
+    // Bound memory even if all are unexpired: drop oldest (insertion order).
+    while (this.pendingVerifiers.size >= SpotifyOAuth.VERIFIER_MAX) {
+      const oldest = this.pendingVerifiers.keys().next().value;
+      if (oldest === undefined) break;
+      this.pendingVerifiers.delete(oldest);
+    }
+  }
+
+  /** Update the operator's app credentials at runtime (from Settings save) so
+   *  a UI-entered Client ID takes effect without a process restart. Empty
+   *  clientId disables OAuth (isAuthorized()/buildAuthorizeUrl() gate on it). */
+  configure(clientId?: string, redirectUri?: string): void {
+    this.clientId = clientId?.trim() || "";
+    this.redirectUri = redirectUri || "";
+  }
+
+  getClientId(): string {
+    return this.clientId;
+  }
+
+  getRedirectUri(): string {
+    return this.redirectUri;
+  }
+
+  isAuthorized(): boolean {
+    // C3.2: no client_id means we could never refresh, so treat as unauthorized.
+    return !!this.clientId && !!this.store.load()?.refreshToken;
+  }
+
+  buildAuthorizeUrl(): { url: string; state: string } {
+    if (!this.clientId) {
+      // C3.2: cannot start OAuth against nobody's app.
+      throw new Error("Set your Spotify Client ID in settings first");
+    }
+    const state = randomBytes(16).toString("hex");
+    const verifier = generateCodeVerifier();
+    this.evictStaleVerifiers();
+    this.pendingVerifiers.set(state, {
+      verifier,
+      expiresAt: this.now() + SpotifyOAuth.VERIFIER_TTL_MS,
+    });
+    const params = new URLSearchParams({
+      client_id: this.clientId,
+      response_type: "code",
+      redirect_uri: this.redirectUri,
+      code_challenge: codeChallengeS256(verifier),
+      code_challenge_method: "S256",
+      scope: SPOTIFY_CONTROL_SCOPES,
+      state,
+    });
+    return { url: `${ACCOUNTS_BASE}/authorize?${params.toString()}`, state };
+  }
+
+  async handleCallback(code: string, state: string): Promise<boolean> {
+    const entry = this.pendingVerifiers.get(state);
+    if (!entry || entry.expiresAt < this.now()) {
+      // unknown/expired state -> CSRF guard (drop any stale entry too)
+      this.pendingVerifiers.delete(state);
+      return false;
+    }
+    const verifier = entry.verifier;
+    // C3.7: drop the state->verifier entry on EVERY terminal path (success,
+    // rejected token exchange, or throw) so a failed login can't leak/replay it.
+    try {
+      const body = new URLSearchParams({
+        grant_type: "authorization_code",
+        code,
+        redirect_uri: this.redirectUri,
+        client_id: this.clientId,
+        code_verifier: verifier,
+      });
+      const { data } = await this.http.post("/api/token", body.toString(), {
+        headers: FORM_HEADERS,
+      });
+      if (!data?.access_token || !data?.refresh_token) return false;
+      this.store.save(this.toTokens(data, data.refresh_token, data.scope));
+      return true;
+    } catch {
+      return false;
+    } finally {
+      this.pendingVerifiers.delete(state);
+    }
+  }
+
+  async getAccessToken(): Promise<string | null> {
+    if (!this.clientId) return null; // C3.2: no app => nothing to mint against
+    const tokens = this.store.load();
+    if (!tokens?.refreshToken) return null; // unauthorized
+    if (tokens.accessToken && this.now() < tokens.expiresAt) {
+      return tokens.accessToken;
+    }
+    // Collapse concurrent refreshes: rotation makes a second in-flight refresh
+    // use a refresh token the first one already invalidated.
+    if (this.refreshInFlight) return this.refreshInFlight;
+    this.refreshInFlight = this.refresh(tokens).finally(() => {
+      this.refreshInFlight = null;
+    });
+    return this.refreshInFlight;
+  }
+
+  private async refresh(current: OAuthTokens): Promise<string | null> {
+    const body = new URLSearchParams({
+      grant_type: "refresh_token",
+      refresh_token: current.refreshToken,
+      client_id: this.clientId,
+    });
+    try {
+      const { data } = await this.http.post("/api/token", body.toString(), {
+        headers: FORM_HEADERS,
+      });
+      if (!data?.access_token) return null;
+      // PKCE rotates the refresh token; fall back to the current one if omitted.
+      const rotated = data.refresh_token || current.refreshToken;
+      const saved = this.toTokens(data, rotated, data.scope ?? current.scope);
+      this.store.save(saved);
+      return saved.accessToken;
+    } catch (err: any) {
+      // invalid_grant => refresh token revoked/expired: discard, force re-login.
+      if (err?.response?.data?.error === "invalid_grant") this.store.clear();
+      return null;
+    }
+  }
+
+  private toTokens(data: any, refreshToken: string, scope: string): OAuthTokens {
+    return {
+      accessToken: data.access_token,
+      refreshToken,
+      expiresAt: this.now() + (data.expires_in ?? 3600) * 1000 - EXPIRY_SKEW_MS,
+      scope: scope ?? SPOTIFY_CONTROL_SCOPES,
+    };
+  }
+}

src/music/spotify/webapi.test.ts

@@ -0,0 +1,577 @@
+import { describe, it, expect, vi } from "vitest";
+import {
+  mapSpotifyTrack,
+  mapSpotifyTracks,
+  mapSpotifyAlbum,
+  mapSpotifyPlaylist,
+  isSpotifyUri,
+  SpotifyWebApi,
+} from "./webapi.js";
+
+describe("mapSpotifyTrack", () => {
+  // Shape trimmed from GET /v1/search?type=track.
+  const raw = {
+    id: "4iV5W9uYEdYUVa79Axb7Rh",
+    name: "Bohemian Rhapsody",
+    artists: [{ name: "Queen" }],
+    album: { name: "A Night at the Opera", images: [{ url: "https://i.scdn.co/x.jpg" }] },
+    duration_ms: 354320,
+  };
+
+  it("maps a track to a Song with platform 'spotify' and seconds duration", () => {
+    const s = mapSpotifyTrack(raw);
+    expect(s.platform).toBe("spotify");
+    expect(s.id).toBe("4iV5W9uYEdYUVa79Axb7Rh");
+    expect(s.name).toBe("Bohemian Rhapsody");
+    expect(s.artist).toBe("Queen");
+    expect(s.album).toBe("A Night at the Opera");
+    expect(s.duration).toBe(354); // 354320ms → 354s
+    expect(s.coverUrl).toBe("https://i.scdn.co/x.jpg");
+  });
+
+  it("joins multiple artists with ', '", () => {
+    const s = mapSpotifyTrack({ ...raw, artists: [{ name: "A" }, { name: "B" }] });
+    expect(s.artist).toBe("A, B");
+  });
+
+  it("tolerates missing fields", () => {
+    const s = mapSpotifyTrack({});
+    expect(s.id).toBe("");
+    expect(s.name).toBe("Unknown");
+    expect(s.artist).toBe("");
+    expect(s.duration).toBe(0);
+    expect(s.coverUrl).toBe("");
+    expect(s.platform).toBe("spotify");
+  });
+
+  it("mapSpotifyTracks returns [] for non-array input", () => {
+    expect(mapSpotifyTracks(undefined as any)).toEqual([]);
+  });
+});
+
+describe("mapSpotifyAlbum", () => {
+  it("maps an album with total_tracks → songCount", () => {
+    const a = mapSpotifyAlbum({
+      id: "1abc",
+      name: "A Night at the Opera",
+      artists: [{ name: "Queen" }],
+      images: [{ url: "https://i.scdn.co/a.jpg" }],
+      total_tracks: 12,
+    });
+    expect(a).toEqual({
+      id: "1abc",
+      name: "A Night at the Opera",
+      artist: "Queen",
+      coverUrl: "https://i.scdn.co/a.jpg",
+      songCount: 12,
+      platform: "spotify",
+    });
+  });
+});
+
+describe("mapSpotifyPlaylist", () => {
+  it("maps a playlist with tracks.total → songCount", () => {
+    const p = mapSpotifyPlaylist({
+      id: "37i9",
+      name: "Today's Top Hits",
+      images: [{ url: "https://i.scdn.co/p.jpg" }],
+      tracks: { total: 50 },
+    });
+    expect(p).toEqual({
+      id: "37i9",
+      name: "Today's Top Hits",
+      coverUrl: "https://i.scdn.co/p.jpg",
+      songCount: 50,
+      platform: "spotify",
+    });
+  });
+});
+
+describe("isSpotifyUri", () => {
+  it("recognizes the sentinel URI", () => {
+    expect(isSpotifyUri("spotify:track:4iV5W9uYEdYUVa79Axb7Rh")).toBe(true);
+    expect(isSpotifyUri("https://music.126.net/x.mp3")).toBe(false);
+    expect(isSpotifyUri("")).toBe(false);
+  });
+});
+
+describe("SpotifyWebApi rate-limit handling", () => {
+  it("retries once on 429 (honoring Retry-After) then returns data", async () => {
+    const auth = {
+      post: vi.fn().mockResolvedValue({ data: { access_token: "t", expires_in: 3600 } }),
+    } as any;
+    let call = 0;
+    const http = {
+      get: vi.fn().mockImplementation(() => {
+        call += 1;
+        if (call === 1) {
+          return Promise.reject({ response: { status: 429, headers: { "retry-after": "0" } } });
+        }
+        return Promise.resolve({
+          data: { tracks: { items: [{ id: "t1", name: "n", artists: [], duration_ms: 1000 }] } },
+        });
+      }),
+    } as any;
+    const api = new SpotifyWebApi(() => ({ clientId: "a", clientSecret: "b" }), { http, auth });
+    const out = await api.search("queen");
+    expect(http.get).toHaveBeenCalledTimes(2); // one 429, one success
+    expect(out.songs[0].id).toBe("t1");
+  });
+
+  // I5: the retry is BOUNDED — get() passes `false` on the recursive call so a
+  // second 429 is NOT retried. Without that bound arg this recurses forever;
+  // this test must FAIL (time out) if the `false` in `this.get(path, params, false)`
+  // is removed. retry-after "0" keeps the single permitted wait instant.
+  it("gives up after exactly ONE 429 retry when every call 429s (bounded, no infinite loop)", async () => {
+    const auth = {
+      post: vi.fn().mockResolvedValue({ data: { access_token: "t", expires_in: 3600 } }),
+    } as any;
+    const http = {
+      get: vi.fn().mockRejectedValue({
+        response: { status: 429, headers: { "retry-after": "0" } },
+      }),
+    } as any;
+    const api = new SpotifyWebApi(() => ({ clientId: "a", clientSecret: "b" }), { http, auth });
+    const out = await api.search("queen");
+    // Exactly two attempts: the original + one bounded retry, then it stops.
+    expect(http.get).toHaveBeenCalledTimes(2);
+    // Giving up returns null from get() → search yields an empty (non-throwing) result.
+    expect(out).toEqual({ songs: [], playlists: [], albums: [] });
+  });
+
+  // I5: the advised wait is capped by Math.min(retryAfter, 10). A large Retry-After
+  // (999s) must still wait only 10s, proving the cap. Fake timers keep it instant
+  // while letting us assert the retry fires at 10s, not before.
+  it("caps the Retry-After wait at 10s (Math.min(retryAfter, 10))", async () => {
+    vi.useFakeTimers();
+    try {
+      const auth = {
+        post: vi.fn().mockResolvedValue({ data: { access_token: "t", expires_in: 3600 } }),
+      } as any;
+      let call = 0;
+      const http = {
+        get: vi.fn().mockImplementation(() => {
+          call += 1;
+          if (call === 1) {
+            return Promise.reject({ response: { status: 429, headers: { "retry-after": "999" } } });
+          }
+          return Promise.resolve({
+            data: { tracks: { items: [{ id: "t1", name: "n", artists: [], duration_ms: 1000 }] } },
+          });
+        }),
+      } as any;
+      const api = new SpotifyWebApi(() => ({ clientId: "a", clientSecret: "b" }), { http, auth });
+      const p = api.search("queen");
+
+      // Let the token fetch + first (429) call settle and schedule the wait.
+      await vi.advanceTimersByTimeAsync(9_000); // 9s < cap → retry has NOT fired yet
+      expect(http.get).toHaveBeenCalledTimes(1);
+
+      await vi.advanceTimersByTimeAsync(1_000); // now 10s total → cap reached, retry fires
+      const out = await p;
+      expect(http.get).toHaveBeenCalledTimes(2);
+      expect(out.songs[0].id).toBe("t1");
+    } finally {
+      vi.useRealTimers();
+    }
+  });
+
+  // Corner-case: a non-numeric Retry-After (HTTP-date) must NOT coerce to NaN and
+  // fire the retry at 0ms. `Number("Wed, 21 Oct 2025 07:28:00 GMT")` is NaN, so the
+  // pre-fix `Math.min(NaN,10)*1000` schedules an immediate (or never-firing) retry
+  // that ignores the advised backoff. Post-fix falls back to a finite 1s wait: the
+  // retry stays scheduled at exactly the fallback, still bounded to ONE retry.
+  it("falls back to a finite 1s wait when Retry-After is an HTTP-date (not NaN/immediate)", async () => {
+    vi.useFakeTimers();
+    try {
+      const auth = {
+        post: vi.fn().mockResolvedValue({ data: { access_token: "t", expires_in: 3600 } }),
+      } as any;
+      let call = 0;
+      const http = {
+        get: vi.fn().mockImplementation(() => {
+          call += 1;
+          if (call === 1) {
+            return Promise.reject({
+              response: {
+                status: 429,
+                headers: { "retry-after": "Wed, 21 Oct 2025 07:28:00 GMT" },
+              },
+            });
+          }
+          return Promise.resolve({
+            data: { tracks: { items: [{ id: "t1", name: "n", artists: [], duration_ms: 1000 }] } },
+          });
+        }),
+      } as any;
+      const api = new SpotifyWebApi(() => ({ clientId: "a", clientSecret: "b" }), { http, auth });
+      const p = api.search("queen");
+
+      // Let the token fetch + first (429) call settle and schedule the wait.
+      await vi.advanceTimersByTimeAsync(999); // < 1s fallback → retry has NOT fired yet
+      expect(http.get).toHaveBeenCalledTimes(1);
+
+      await vi.advanceTimersByTimeAsync(1); // now 1s total → finite fallback reached, retry fires
+      const out = await p;
+      expect(http.get).toHaveBeenCalledTimes(2); // exactly one bounded retry
+      expect(out.songs[0].id).toBe("t1");
+    } finally {
+      vi.useRealTimers();
+    }
+  });
+
+  // Corner-case sibling: an empty Retry-After coerces to 0 (`Number("")` === 0), so
+  // pre-fix `Math.min(0,10)*1000` fires the retry immediately at 0ms. Post-fix guards
+  // `raw > 0`, so it falls back to the same finite 1s wait rather than firing at 0.
+  it("falls back to a finite 1s wait when Retry-After is empty (not 0/immediate)", async () => {
+    vi.useFakeTimers();
+    try {
+      const auth = {
+        post: vi.fn().mockResolvedValue({ data: { access_token: "t", expires_in: 3600 } }),
+      } as any;
+      let call = 0;
+      const http = {
+        get: vi.fn().mockImplementation(() => {
+          call += 1;
+          if (call === 1) {
+            return Promise.reject({ response: { status: 429, headers: { "retry-after": "" } } });
+          }
+          return Promise.resolve({
+            data: { tracks: { items: [{ id: "t1", name: "n", artists: [], duration_ms: 1000 }] } },
+          });
+        }),
+      } as any;
+      const api = new SpotifyWebApi(() => ({ clientId: "a", clientSecret: "b" }), { http, auth });
+      const p = api.search("queen");
+
+      await vi.advanceTimersByTimeAsync(999); // < 1s fallback → retry must NOT have fired at 0ms
+      expect(http.get).toHaveBeenCalledTimes(1);
+
+      await vi.advanceTimersByTimeAsync(1); // 1s total → fallback reached, retry fires
+      const out = await p;
+      expect(http.get).toHaveBeenCalledTimes(2);
+      expect(out.songs[0].id).toBe("t1");
+    } finally {
+      vi.useRealTimers();
+    }
+  });
+
+  // Regression guard: a NORMAL numeric Retry-After ("3") is finite/positive, so the
+  // guard is transparent — the advised ~3s wait (below the 10s cap) is honored intact.
+  it("still honors a normal numeric Retry-After (~3s, below the 10s cap)", async () => {
+    vi.useFakeTimers();
+    try {
+      const auth = {
+        post: vi.fn().mockResolvedValue({ data: { access_token: "t", expires_in: 3600 } }),
+      } as any;
+      let call = 0;
+      const http = {
+        get: vi.fn().mockImplementation(() => {
+          call += 1;
+          if (call === 1) {
+            return Promise.reject({ response: { status: 429, headers: { "retry-after": "3" } } });
+          }
+          return Promise.resolve({
+            data: { tracks: { items: [{ id: "t1", name: "n", artists: [], duration_ms: 1000 }] } },
+          });
+        }),
+      } as any;
+      const api = new SpotifyWebApi(() => ({ clientId: "a", clientSecret: "b" }), { http, auth });
+      const p = api.search("queen");
+
+      await vi.advanceTimersByTimeAsync(2_999); // < 3s advised → retry has NOT fired yet
+      expect(http.get).toHaveBeenCalledTimes(1);
+
+      await vi.advanceTimersByTimeAsync(1); // 3s total → advised wait reached, retry fires
+      const out = await p;
+      expect(http.get).toHaveBeenCalledTimes(2);
+      expect(out.songs[0].id).toBe("t1");
+    } finally {
+      vi.useRealTimers();
+    }
+  });
+
+  it("returns empty results when unconfigured (no creds → no token)", async () => {
+    const api = new SpotifyWebApi(() => ({ clientId: "", clientSecret: "" }));
+    expect(await api.search("queen")).toEqual({ songs: [], playlists: [], albums: [] });
+  });
+});
+
+// m4: the catalog fetch mappers (getTrack / getAlbumTracks / getPlaylistTracks)
+// were untested. They shape raw Spotify payloads into Songs, inject album cover
+// context, and drop malformed playlist rows.
+describe("SpotifyWebApi catalog mappers", () => {
+  /** Builds an api whose single http.get resolves the supplied payload. */
+  function makeApi(payload: unknown) {
+    const auth = {
+      post: vi.fn().mockResolvedValue({ data: { access_token: "t", expires_in: 3600 } }),
+    } as any;
+    const http = { get: vi.fn().mockResolvedValue({ data: payload }) } as any;
+    const api = new SpotifyWebApi(() => ({ clientId: "a", clientSecret: "b" }), { http, auth });
+    return { api, http };
+  }
+
+  describe("getTrack", () => {
+    it("maps a single track payload to a Song", async () => {
+      const { api } = makeApi({
+        id: "trk1",
+        name: "Song One",
+        artists: [{ name: "Alice" }, { name: "Bob" }],
+        album: { name: "Album X", images: [{ url: "https://i.scdn.co/t.jpg" }] },
+        duration_ms: 210000,
+      });
+      const s = await api.getTrack("trk1");
+      expect(s).toEqual({
+        id: "trk1",
+        name: "Song One",
+        artist: "Alice, Bob",
+        album: "Album X",
+        duration: 210,
+        coverUrl: "https://i.scdn.co/t.jpg",
+        platform: "spotify",
+      });
+    });
+
+    it("returns null when the track fetch yields no data", async () => {
+      const auth = {
+        post: vi.fn().mockResolvedValue({ data: { access_token: "t", expires_in: 3600 } }),
+      } as any;
+      const http = { get: vi.fn().mockResolvedValue({ data: null }) } as any;
+      const api = new SpotifyWebApi(() => ({ clientId: "a", clientSecret: "b" }), { http, auth });
+      expect(await api.getTrack("nope")).toBeNull();
+    });
+  });
+
+  describe("getAlbumTracks", () => {
+    it("injects the album name + cover into every returned track", async () => {
+      // Album-track objects omit their own album block; the album cover/name must
+      // be back-filled from the album payload.
+      const { api } = makeApi({
+        name: "A Night at the Opera",
+        images: [{ url: "https://i.scdn.co/album.jpg" }],
+        tracks: {
+          items: [
+            { id: "a1", name: "Death on Two Legs", artists: [{ name: "Queen" }], duration_ms: 223000 },
+            { id: "a2", name: "Lazing on a Sunday", artists: [{ name: "Queen" }], duration_ms: 68000 },
+          ],
+        },
+      });
+      const out = await api.getAlbumTracks("alb1");
+      expect(out).toHaveLength(2);
+      for (const t of out) {
+        expect(t.album).toBe("A Night at the Opera");
+        expect(t.coverUrl).toBe("https://i.scdn.co/album.jpg");
+        expect(t.platform).toBe("spotify");
+      }
+      expect(out[0].id).toBe("a1");
+      expect(out[0].name).toBe("Death on Two Legs");
+      expect(out[1].id).toBe("a2");
+    });
+
+    it("drops null track entries and returns [] when tracks.items is absent", async () => {
+      const { api: withNull } = makeApi({
+        name: "Alb",
+        images: [{ url: "https://i.scdn.co/c.jpg" }],
+        tracks: { items: [null, { id: "ok", name: "Keep", artists: [], duration_ms: 1000 }] },
+      });
+      const out = await withNull.getAlbumTracks("alb1");
+      expect(out).toHaveLength(1);
+      expect(out[0].id).toBe("ok");
+      expect(out[0].coverUrl).toBe("https://i.scdn.co/c.jpg");
+
+      const { api: noItems } = makeApi({ name: "Alb", images: [], tracks: {} });
+      expect(await noItems.getAlbumTracks("alb1")).toEqual([]);
+    });
+  });
+
+  describe("getPlaylistTracks", () => {
+    it("filters null items, {track:null}, and id-less tracks (never emits an id:'' Song)", async () => {
+      const { api } = makeApi({
+        items: [
+          null,
+          { track: null },
+          { track: { name: "No Id Here", artists: [], duration_ms: 1000 } }, // track present but no id
+          { track: { id: "p1", name: "Real Song", artists: [{ name: "X" }], duration_ms: 1000 } },
+        ],
+      });
+      const out = await api.getPlaylistTracks("pl1");
+      expect(out).toHaveLength(1);
+      expect(out[0].id).toBe("p1");
+      expect(out[0].name).toBe("Real Song");
+      // Guard the specific defect: no malformed empty-id Song leaks through.
+      expect(out.every((s) => s.id !== "")).toBe(true);
+    });
+
+    it("returns [] when items is absent", async () => {
+      const { api } = makeApi({});
+      expect(await api.getPlaylistTracks("pl1")).toEqual([]);
+    });
+  });
+});
+
+// R2-3: getPlaylistTracks must paginate (follow data.next) rather than silently
+// truncating to the first 100 tracks, and must stop at a bounded cap so a
+// pathological 10k-track playlist can't fan out into dozens of API calls.
+describe("getPlaylistTracks pagination (R2-3)", () => {
+  const trackItem = (i: number) => ({
+    track: { id: `p${i}`, name: `Song ${i}`, artists: [{ name: "X" }], duration_ms: 1000 },
+  });
+
+  it("follows data.next across pages, returning all tracks in order with nulls filtered", async () => {
+    const auth = {
+      post: vi.fn().mockResolvedValue({ data: { access_token: "t", expires_in: 3600 } }),
+    } as any;
+    const page1 = {
+      items: Array.from({ length: 100 }, (_, i) => trackItem(i)),
+      next: "https://api.spotify.com/v1/playlists/pl1/tracks?offset=100&limit=100",
+    };
+    // Nulls / {track:null} / id-less rows on page 2 prove cross-page filtering.
+    const page2 = {
+      items: [null, { track: null }, { track: { name: "NoId", artists: [], duration_ms: 1 } }, trackItem(100), trackItem(101)],
+      next: null,
+    };
+    const http = {
+      get: vi.fn().mockResolvedValueOnce({ data: page1 }).mockResolvedValueOnce({ data: page2 }),
+    } as any;
+    const api = new SpotifyWebApi(() => ({ clientId: "a", clientSecret: "b" }), { http, auth });
+    const out = await api.getPlaylistTracks("pl1");
+
+    expect(http.get).toHaveBeenCalledTimes(2);
+    expect(out).toHaveLength(102); // 100 (page 1) + 2 real (page 2, three junk rows dropped)
+    expect(out[0].id).toBe("p0");
+    expect(out[99].id).toBe("p99");
+    expect(out[100].id).toBe("p100"); // page 2 appended in order
+    expect(out[101].id).toBe("p101");
+    expect(out.every((s) => s.id !== "")).toBe(true);
+  });
+
+  it("stops at the bounded cap when pages never end (call count bounded)", async () => {
+    const auth = {
+      post: vi.fn().mockResolvedValue({ data: { access_token: "t", expires_in: 3600 } }),
+    } as any;
+    // Every page is full (100) and always advertises a further next page.
+    const http = {
+      get: vi.fn().mockImplementation((_path: string, cfg: any) => {
+        const offset = Number(cfg?.params?.offset ?? 0);
+        return Promise.resolve({
+          data: {
+            items: Array.from({ length: 100 }, (_, i) => trackItem(offset + i)),
+            next: `https://api.spotify.com/v1/playlists/pl1/tracks?offset=${offset + 100}`,
+          },
+        });
+      }),
+    } as any;
+    const api = new SpotifyWebApi(() => ({ clientId: "a", clientSecret: "b" }), { http, auth });
+    const out = await api.getPlaylistTracks("pl1");
+
+    expect(out.length).toBeLessThanOrEqual(500); // never exceeds the cap
+    expect(out).toHaveLength(500); // and reaches it exactly
+    expect(http.get.mock.calls.length).toBeLessThanOrEqual(5); // 500 cap / 100 per page
+  });
+});
+
+// R2-6: getAlbumTracks must page beyond the 50-track embedded cap via the
+// dedicated /albums/{id}/tracks endpoint, still injecting album name + cover.
+describe("getAlbumTracks pagination (R2-6)", () => {
+  const albTrack = (i: number) => ({ id: `a${i}`, name: `T${i}`, artists: [{ name: "Queen" }], duration_ms: 1000 });
+
+  it("pages beyond the embedded 50-track cap, injecting album name/cover", async () => {
+    const auth = {
+      post: vi.fn().mockResolvedValue({ data: { access_token: "t", expires_in: 3600 } }),
+    } as any;
+    const albumPayload = {
+      name: "Big Compilation",
+      images: [{ url: "https://i.scdn.co/big.jpg" }],
+      tracks: {
+        items: Array.from({ length: 50 }, (_, i) => albTrack(i)),
+        next: "https://api.spotify.com/v1/albums/alb1/tracks?offset=50&limit=50",
+      },
+    };
+    const page2 = { items: [albTrack(50), albTrack(51), null, albTrack(52)], next: null };
+    const http = {
+      get: vi
+        .fn()
+        .mockResolvedValueOnce({ data: albumPayload }) // GET /v1/albums/alb1
+        .mockResolvedValueOnce({ data: page2 }), // GET /v1/albums/alb1/tracks
+    } as any;
+    const api = new SpotifyWebApi(() => ({ clientId: "a", clientSecret: "b" }), { http, auth });
+    const out = await api.getAlbumTracks("alb1");
+
+    expect(http.get).toHaveBeenCalledTimes(2);
+    expect(out).toHaveLength(53); // 50 + 3 real (one null dropped)
+    for (const t of out) {
+      expect(t.album).toBe("Big Compilation");
+      expect(t.coverUrl).toBe("https://i.scdn.co/big.jpg");
+      expect(t.platform).toBe("spotify");
+    }
+    expect(out[0].id).toBe("a0");
+    expect(out[49].id).toBe("a49");
+    expect(out[50].id).toBe("a50"); // page 2 appended in order
+    expect(out[52].id).toBe("a52");
+  });
+
+  // Robustness: a malformed/proxy response of { items: [], next: <non-null> } never
+  // grows songs.length nor nulls `next`, so a while-loop bounded ONLY by
+  // songs.length >= cap spins forever. getAlbumTracks must have a hard offset/page
+  // bound (mirroring the playlist loop) so it TERMINATES regardless of items/next.
+  it("terminates on a { items: [], next: <non-null> } response (bounded call count, no hang)", async () => {
+    const auth = {
+      post: vi.fn().mockResolvedValue({ data: { access_token: "t", expires_in: 3600 } }),
+    } as any;
+    const http = {
+      get: vi.fn().mockImplementation((path: string) => {
+        if (path === "/v1/albums/alb1") {
+          // Even the embedded first page is malformed: empty items, non-null next.
+          return Promise.resolve({
+            data: {
+              name: "Broken",
+              images: [{ url: "https://i.scdn.co/broken.jpg" }],
+              tracks: { items: [], next: "http://x/next" },
+            },
+          });
+        }
+        // Every /albums/{id}/tracks page keeps advertising a further page forever.
+        return Promise.resolve({ data: { items: [], next: "http://x/next" } });
+      }),
+    } as any;
+    const api = new SpotifyWebApi(() => ({ clientId: "a", clientSecret: "b" }), { http, auth });
+    const out = await api.getAlbumTracks("alb1");
+
+    // Returns what it has (nothing) rather than hanging.
+    expect(out).toEqual([]);
+    // Bounded: 1 album GET + at most MAX_ALBUM_TRACKS/ALBUM_PAGE_SIZE (=10) page fetches.
+    expect(http.get.mock.calls.length).toBeLessThanOrEqual(12);
+  });
+});
+
+// R2-7: search() must null-filter tracks.items like its album/playlist siblings so
+// an unavailable/relinked null track never becomes a bogus id:'' "Unknown" Song.
+describe("search track null-filtering (R2-7)", () => {
+  it("drops null and id-less track entries (never emits an empty-id 'Unknown' song)", async () => {
+    const auth = {
+      post: vi.fn().mockResolvedValue({ data: { access_token: "t", expires_in: 3600 } }),
+    } as any;
+    const http = {
+      get: vi.fn().mockResolvedValue({
+        data: {
+          tracks: {
+            items: [
+              null, // unavailable/relinked track
+              { id: "t1", name: "Real", artists: [{ name: "X" }], duration_ms: 1000 },
+              {}, // id-less → maps to {id:'', name:'Unknown'}, must also be dropped
+            ],
+          },
+          albums: { items: [] },
+          playlists: { items: [] },
+        },
+      }),
+    } as any;
+    const api = new SpotifyWebApi(() => ({ clientId: "a", clientSecret: "b" }), { http, auth });
+    const out = await api.search("x");
+
+    expect(out.songs).toHaveLength(1);
+    expect(out.songs[0].id).toBe("t1");
+    expect(out.songs.some((s) => s.id === "")).toBe(false);
+    expect(out.songs.some((s) => s.name === "Unknown")).toBe(false);
+  });
+});

src/music/spotify/webapi.ts

@@ -0,0 +1,232 @@
+import axios, { type AxiosInstance } from "axios";
+import type { Song, Album, Playlist, SearchResult } from "../provider.js";
+
+export interface SpotifyCreds {
+  clientId: string;
+  clientSecret: string;
+}
+
+const ACCOUNTS_BASE = "https://accounts.spotify.com";
+const API_BASE = "https://api.spotify.com";
+
+// Spotify pages collection tracks at 100 (playlists) / 50 (albums). Follow the
+// paging links, but bound the fan-out so a pathological 10k-track collection
+// can't explode into dozens of API calls; stop once the cap is reached.
+const PLAYLIST_PAGE_SIZE = 100;
+const ALBUM_PAGE_SIZE = 50;
+const MAX_PLAYLIST_TRACKS = 500;
+const MAX_ALBUM_TRACKS = 500;
+
+function artistsToString(artists: unknown): string {
+  return Array.isArray(artists)
+    ? artists.map((a: any) => a?.name).filter(Boolean).join(", ")
+    : "";
+}
+
+/** Map a Spotify track object (search / tracks / playlist item .track) to a Song. */
+export function mapSpotifyTrack(raw: any): Song {
+  return {
+    id: raw?.id ?? "",
+    name: raw?.name ?? "Unknown",
+    artist: artistsToString(raw?.artists),
+    album: raw?.album?.name ?? "",
+    duration: Math.round((raw?.duration_ms ?? 0) / 1000),
+    coverUrl: raw?.album?.images?.[0]?.url ?? "",
+    platform: "spotify",
+  };
+}
+
+export function mapSpotifyTracks(raw: any): Song[] {
+  return Array.isArray(raw) ? raw.map(mapSpotifyTrack) : [];
+}
+
+export function mapSpotifyAlbum(raw: any): Album {
+  return {
+    id: raw?.id ?? "",
+    name: raw?.name ?? "Unknown",
+    artist: artistsToString(raw?.artists),
+    coverUrl: raw?.images?.[0]?.url ?? "",
+    songCount: raw?.total_tracks ?? 0,
+    platform: "spotify",
+  };
+}
+
+export function mapSpotifyPlaylist(raw: any): Playlist {
+  return {
+    id: raw?.id ?? "",
+    name: raw?.name ?? "Unknown",
+    coverUrl: raw?.images?.[0]?.url ?? "",
+    songCount: raw?.tracks?.total ?? 0,
+    platform: "spotify",
+  };
+}
+
+/** True for the getSongUrl sentinel (spotify:track:<id>); real audio lands in Stage 2/3. */
+export function isSpotifyUri(url: string): boolean {
+  return typeof url === "string" && url.startsWith("spotify:");
+}
+
+export class SpotifyWebApi {
+  private getCreds: () => SpotifyCreds;
+  private http: AxiosInstance;
+  private auth: AxiosInstance;
+  private token = "";
+  private tokenExpiresAt = 0;
+
+  constructor(
+    getCreds: () => SpotifyCreds,
+    deps?: { http?: AxiosInstance; auth?: AxiosInstance }
+  ) {
+    this.getCreds = getCreds;
+    this.http = deps?.http ?? axios.create({ baseURL: API_BASE, timeout: 15_000 });
+    this.auth = deps?.auth ?? axios.create({ baseURL: ACCOUNTS_BASE, timeout: 15_000 });
+  }
+
+  setCreds(_c: SpotifyCreds): void {
+    // Creds are read live via getCreds(); force a token refresh on next call.
+    this.token = "";
+    this.tokenExpiresAt = 0;
+  }
+
+  hasCreds(): boolean {
+    const c = this.getCreds();
+    return !!c.clientId && !!c.clientSecret;
+  }
+
+  /** Client-Credentials app token, cached until ~30s before expiry. */
+  private async getToken(): Promise<string | null> {
+    if (!this.hasCreds()) return null;
+    if (this.token && Date.now() < this.tokenExpiresAt) return this.token;
+    const { clientId, clientSecret } = this.getCreds();
+    const basic = Buffer.from(`${clientId}:${clientSecret}`).toString("base64");
+    try {
+      const { data } = await this.auth.post(
+        "/api/token",
+        "grant_type=client_credentials",
+        {
+          headers: {
+            Authorization: `Basic ${basic}`,
+            "Content-Type": "application/x-www-form-urlencoded",
+          },
+        }
+      );
+      this.token = data?.access_token ?? "";
+      this.tokenExpiresAt = Date.now() + ((data?.expires_in ?? 3600) - 30) * 1000;
+      return this.token || null;
+    } catch {
+      return null;
+    }
+  }
+
+  private async get(
+    path: string,
+    params?: Record<string, unknown>,
+    retryOn429 = true
+  ): Promise<any | null> {
+    const token = await this.getToken();
+    if (!token) return null;
+    try {
+      const { data } = await this.http.get(path, {
+        params,
+        headers: { Authorization: `Bearer ${token}` },
+      });
+      return data;
+    } catch (err: any) {
+      // Spotify rate-limits on a rolling 30s window (429 + Retry-After seconds).
+      // Retry once after the advised delay before giving up.
+      if (retryOn429 && err?.response?.status === 429) {
+        // Retry-After may be a non-numeric HTTP-date or empty string; Number(...)
+        // then yields NaN/0 and fires the single retry at 0ms, ignoring the advised
+        // backoff. Guard for a finite positive value (mirrors connect-api.ts).
+        const raw = Number(err.response?.headers?.["retry-after"]);
+        const retryAfter = Number.isFinite(raw) && raw > 0 ? raw : 1;
+        await new Promise((r) => setTimeout(r, Math.min(retryAfter, 10) * 1000));
+        return this.get(path, params, false);
+      }
+      return null;
+    }
+  }
+
+  async search(query: string, limit = 20): Promise<SearchResult> {
+    const data = await this.get("/v1/search", {
+      q: query,
+      type: "track,album,playlist",
+      limit,
+    });
+    if (!data) return { songs: [], playlists: [], albums: [] };
+    return {
+      // Mirror the album/playlist filtering: a null entry (unavailable/relinked
+      // track) must not become a bogus id:'' "Unknown" Song. Drop empty ids too.
+      songs: Array.isArray(data?.tracks?.items)
+        ? data.tracks.items
+            .filter(Boolean)
+            .map(mapSpotifyTrack)
+            .filter((s: Song) => s.id !== "")
+        : [],
+      albums: Array.isArray(data?.albums?.items)
+        ? data.albums.items.filter(Boolean).map(mapSpotifyAlbum)
+        : [],
+      playlists: Array.isArray(data?.playlists?.items)
+        ? data.playlists.items.filter(Boolean).map(mapSpotifyPlaylist)
+        : [],
+    };
+  }
+
+  async getTrack(id: string): Promise<Song | null> {
+    const data = await this.get(`/v1/tracks/${id}`);
+    return data ? mapSpotifyTrack(data) : null;
+  }
+
+  async getAlbumTracks(albumId: string): Promise<Song[]> {
+    // Album-track objects omit the album block; fetch the album cover once and inject it.
+    const album = await this.get(`/v1/albums/${albumId}`);
+    const cover = album?.images?.[0]?.url ?? "";
+    const albumName = album?.name ?? "";
+
+    // Page 1 (up to 50 tracks) is embedded in the album payload; the embedded
+    // paging object caps at 50, so follow its `next` via the dedicated
+    // /albums/{id}/tracks endpoint until exhausted or the cap is reached. The
+    // offset bound is a HARD termination guarantee (mirrors the playlist loop):
+    // a malformed/proxy response of { items: [], next: <non-null> } never grows
+    // songs.length nor nulls `next`, so a loop bounded only by songs.length would
+    // spin forever — the offset cap stops it regardless of items/next.
+    const songs: Song[] = [];
+    let page = album?.tracks;
+    let offset = ALBUM_PAGE_SIZE;
+    while (page && Array.isArray(page.items)) {
+      for (const t of page.items.filter(Boolean)) {
+        songs.push({ ...mapSpotifyTrack(t), album: albumName, coverUrl: cover });
+      }
+      if (!page.next || songs.length >= MAX_ALBUM_TRACKS || offset >= MAX_ALBUM_TRACKS) break;
+      page = await this.get(`/v1/albums/${albumId}/tracks`, {
+        limit: ALBUM_PAGE_SIZE,
+        offset,
+      });
+      offset += ALBUM_PAGE_SIZE;
+    }
+    return songs.slice(0, MAX_ALBUM_TRACKS);
+  }
+
+  async getPlaylistTracks(playlistId: string): Promise<Song[]> {
+    // A single limit:100 page silently truncates 100+ track playlists. Follow
+    // `data.next` (advancing offset) until exhausted or the cap is reached, so a
+    // 10k-track playlist can't fan out into 100 API calls.
+    const songs: Song[] = [];
+    for (let offset = 0; offset < MAX_PLAYLIST_TRACKS; offset += PLAYLIST_PAGE_SIZE) {
+      const data = await this.get(`/v1/playlists/${playlistId}/tracks`, {
+        limit: PLAYLIST_PAGE_SIZE,
+        offset,
+      });
+      const items = data?.items;
+      if (!Array.isArray(items)) break;
+      // Keep the null / {track:null} / id-less filtering across ALL pages.
+      const mapped = items
+        .map((it: any) => it?.track)
+        .filter((t: any) => t && t.id)
+        .map(mapSpotifyTrack);
+      songs.push(...mapped);
+      if (!data.next) break;
+    }
+    return songs.slice(0, MAX_PLAYLIST_TRACKS);
+  }
+}

src/music/youtube.ts

@@ -7,6 +7,7 @@ import type {
   MusicProvider,
   Song,
   SongWithUrl,
+  SongUrlResult,
   Playlist,
   Album,
   SearchResult,
@@ -114,27 +115,33 @@ export class YouTubeProvider implements MusicProvider {
   readonly platform = "youtube" as const;
   private quality = "bestaudio";
 
-  async search(query: string, limit = 5): Promise<SearchResult> {
+  async search(query: string, limit = 5, offset = 0): Promise<SearchResult> {
     try {
+      // yt-dlp's `ytsearchN` has no offset cursor — it always returns the first
+      // N results. Best-effort paginate by fetching offset+limit and slicing
+      // locally. (offset 0 → identical to before.)
+      const total = offset + limit;
       const raw = await runYtDlp([
-        `ytsearch${limit}:${query}`,
+        `ytsearch${total}:${query}`,
         "--dump-json",
         "--flat-playlist",
         "--no-warnings",
         "--quiet",
       ]);
       const lines = raw.trim().split("\n").filter(Boolean);
-      const songs: Song[] = lines.map((line) => {
-        const entry = JSON.parse(line) as YtDlpEntry;
-        return entryToSong(entry);
-      });
+      const songs: Song[] = lines
+        .slice(offset, offset + limit)
+        .map((line) => {
+          const entry = JSON.parse(line) as YtDlpEntry;
+          return entryToSong(entry);
+        });
       return { songs, playlists: [], albums: [] };
     } catch {
       return { songs: [], playlists: [], albums: [] };
     }
   }
 
-  async getSongUrl(songId: string): Promise<string | null> {
+  async getSongUrl(songId: string): Promise<SongUrlResult | null> {
     try {
       const url = `https://www.youtube.com/watch?v=${songId}`;
       const raw = await runYtDlp([
@@ -146,7 +153,7 @@ export class YouTubeProvider implements MusicProvider {
         "--quiet",
       ], 45_000);
       const audioUrl = raw.trim().split("\n")[0];
-      return audioUrl || null;
+      return audioUrl ? { url: audioUrl } : null;
     } catch {
       return null;
     }

src/ts-protocol/client-groups.test.ts

@@ -0,0 +1,141 @@
+import { afterEach, describe, it, expect, vi } from "vitest";
+import pino from "pino";
+import { TS3Client } from "./client.js";
+
+/**
+ * Integration "smoke test" for the admin-command gate's group resolution.
+ *
+ * It drives the REAL TS3Client.getClientServerGroups → library getClientInfo
+ * path against a stubbed underlying client, so it exercises the actual
+ * `clientinfo clid=<id>` query string and the real `client_servergroups`
+ * parsing — the pieces that were previously only verified by reading the code.
+ *
+ * What this CANNOT cover (inherently server-side, needs a live TS server):
+ * whether a real server returns groups for a client in a DIFFERENT channel.
+ * The stub models the server-wide answer (groups returned regardless of
+ * channel); the failure modes below confirm we fail closed when it doesn't.
+ */
+function makeClient(): TS3Client {
+  return new TS3Client(
+    { host: "localhost", port: 9987, queryPort: 10011, nickname: "TestBot" },
+    pino({ level: "silent" }),
+  );
+}
+
+/** Inject a fake low-level client carrying a canned clientinfo response. */
+function withFakeClient(
+  ts: TS3Client,
+  respond: (cmd: string) => Record<string, string>[] | Promise<Record<string, string>[]>,
+): string[] {
+  const calls: string[] = [];
+  const fake = {
+    execCommandWithResponse: vi.fn(async (cmd: string) => {
+      calls.push(cmd);
+      return respond(cmd);
+    }),
+  };
+  (ts as unknown as { client: unknown }).client = fake;
+  return calls;
+}
+
+describe("TS3Client.getClientServerGroups — live query + parse smoke test", () => {
+  it("issues `clientinfo clid=<id>` and parses comma-separated client_servergroups", async () => {
+    const ts = makeClient();
+    const calls = withFakeClient(ts, () => [
+      { client_nickname: "Alice", cid: "99", client_servergroups: "6,8" },
+    ]);
+
+    const groups = await ts.getClientServerGroups(5);
+
+    expect(groups).toEqual(["6", "8"]);
+    // Exact query the bot sends to resolve a sender's groups, by client id.
+    expect(calls[0]).toBe("clientinfo clid=5");
+  });
+
+  it("parses a single-group response", async () => {
+    const ts = makeClient();
+    withFakeClient(ts, () => [{ client_servergroups: "6" }]);
+    expect(await ts.getClientServerGroups(5)).toEqual(["6"]);
+  });
+
+  it("returns [] when the client carries no server groups (empty field)", async () => {
+    const ts = makeClient();
+    withFakeClient(ts, () => [{ client_nickname: "Bob", client_servergroups: "" }]);
+    expect(await ts.getClientServerGroups(7)).toEqual([]);
+  });
+
+  it("returns [] when the server-groups field is absent", async () => {
+    const ts = makeClient();
+    withFakeClient(ts, () => [{ client_nickname: "Carol" }]);
+    expect(await ts.getClientServerGroups(7)).toEqual([]);
+  });
+
+  it("fails closed (returns []) when the query throws / client id is unknown", async () => {
+    const ts = makeClient();
+    withFakeClient(ts, () => {
+      throw new Error("invalid clientID");
+    });
+    expect(await ts.getClientServerGroups(999)).toEqual([]);
+  });
+
+  it("returns [] when not connected (no underlying client)", async () => {
+    const ts = makeClient();
+    expect(await ts.getClientServerGroups(5)).toEqual([]);
+  });
+});
+
+describe("TS3Client stable identity UID", () => {
+  it("derives the same client UID after exporting and restoring an identity", () => {
+    const first = makeClient();
+    const restored = new TS3Client(
+      {
+        host: "localhost",
+        port: 9987,
+        queryPort: 10011,
+        nickname: "RestoredBot",
+        identity: first.getIdentityExport(),
+      },
+      pino({ level: "silent" }),
+    );
+
+    expect(first.getClientUid()).toBeTruthy();
+    expect(restored.getClientUid()).toBe(first.getClientUid());
+  });
+});
+
+type VisibleUidHarness = {
+  visibleClientUids: Map<number, string>;
+  rememberVisibleClientUid(clientId: number, clientUid: string): void;
+  releaseVisibleClientUid(clientId: number): void;
+  clearVisibleClientUids(): void;
+};
+
+describe("TS3Client visible client UID grace", () => {
+  afterEach(() => vi.useRealTimers());
+
+  it("retains a leaving client's UID for final reordered voice packets", () => {
+    vi.useFakeTimers();
+    const cache = makeClient() as unknown as VisibleUidHarness;
+    cache.rememberVisibleClientUid(7, "managed-bot-uid=");
+
+    cache.releaseVisibleClientUid(7);
+    vi.advanceTimersByTime(999);
+    expect(cache.visibleClientUids.get(7)).toBe("managed-bot-uid=");
+
+    vi.advanceTimersByTime(1);
+    expect(cache.visibleClientUids.has(7)).toBe(false);
+  });
+
+  it("lets a new clientEnter overwrite a reused id and cancel stale cleanup", () => {
+    vi.useFakeTimers();
+    const cache = makeClient() as unknown as VisibleUidHarness;
+    cache.rememberVisibleClientUid(7, "old-managed-bot-uid=");
+    cache.releaseVisibleClientUid(7);
+
+    cache.rememberVisibleClientUid(7, "new-human-uid=");
+    vi.advanceTimersByTime(1_000);
+
+    expect(cache.visibleClientUids.get(7)).toBe("new-human-uid=");
+    cache.clearVisibleClientUids();
+  });
+});

src/ts-protocol/client.ts

@@ -3,15 +3,20 @@ import { Readable } from "node:stream";
 import {
   Client as TS3FullClient,
   generateIdentity as genTS3Identity,
+  getUidFromPublicKey,
   identityFromString,
   sendTextMessage,
   listChannels,
   listClients,
   clientMove,
+  getClientInfo,
   fileTransferDeleteFile,
   type Identity,
   type TextMessage,
   type ClientInfo,
+  type ClientLeftViewEvent,
+  type ClientMovedEvent,
+  type VoiceData,
   type FileUploadInfo,
 } from "@honeybbq/teamspeak-client";
 import type { Logger } from "../logger.js";
@@ -20,6 +25,10 @@ import {
   type ServerProtocol,
 } from "./protocol-detect.js";
 import { TS6HttpQuery } from "./http-query.js";
+import {
+  TrackingVoiceEndpointResolver,
+  type ResolvedVoiceEndpoint,
+} from "./voice-endpoint.js";
 
 export { CODEC_OPUS_MUSIC } from "./voice.js";
 export type { ServerProtocol } from "./protocol-detect.js";
@@ -44,6 +53,7 @@ export interface TS3ClientOptions {
   nickname: string;
   identity?: string; // Exported identity string, or undefined to generate new
   defaultChannel?: string;
+  channelId?: string; // Numeric channel ID (takes precedence over defaultChannel)
   channelPassword?: string;
   serverPassword?: string;
   /** Force a specific protocol instead of auto-detecting. */
@@ -58,17 +68,56 @@ export interface TS3TextMessage {
   invokerUid: string;
   message: string;
   targetMode: number; // 1=private, 2=channel, 3=server
+  invokerGroups: string[]; // sender's TS server-group ids; [] when not in view cache
+}
+
+/** Lightweight voice-packet signal used for activity detection. The encoded
+ * payload is intentionally not forwarded beyond this protocol wrapper. */
+export interface TS3VoiceActivity {
+  clientId: number;
+  codec: number;
+  /** Stable TeamSpeak identity when the sender is present in the client view. */
+  clientUid?: string;
+}
+
+// Command notifications and UDP voice packets can be reordered in flight.
+// Retain a leaving client's UID briefly so its final packet is still
+// attributable; a new clientEnter for the same id cancels and overwrites it.
+const VISIBLE_CLIENT_UID_RELEASE_GRACE_MS = 1_000;
+
+/**
+ * Map the library's TextMessage to our wrapper. Preserves invokerGroups (the
+ * sender's TS server groups), which the library populates only when the sender
+ * is in the bot's client-view cache; otherwise it is []. Used by the chat
+ * command permission gate.
+ */
+export function toTS3TextMessage(msg: TextMessage): TS3TextMessage {
+  return {
+    invokerName: msg.invokerName,
+    invokerId: String(msg.invokerID),
+    invokerUid: msg.invokerUID,
+    message: msg.message,
+    targetMode: msg.targetMode,
+    invokerGroups: msg.invokerGroups ?? [],
+  };
 }
 
 export class TS3Client extends EventEmitter {
   private client: TS3FullClient | null = null;
   private identity: Identity;
+  private readonly clientUid: string;
   private clientId = 0;
+  private readonly visibleClientUids = new Map<number, string>();
+  private readonly visibleClientUidReleaseTimers = new Map<
+    number,
+    ReturnType<typeof setTimeout>
+  >();
   private logger: Logger;
   private disconnecting = false;
   private detectedProtocol: ServerProtocol = "unknown";
   private httpQuery: TS6HttpQuery | null = null;
   private udpErrorTimer: ReturnType<typeof setTimeout> | null = null;
+  private readonly voiceEndpointResolver = new TrackingVoiceEndpointResolver();
 
   constructor(private options: TS3ClientOptions, logger: Logger) {
     super();
@@ -79,6 +128,7 @@ export class TS3Client extends EventEmitter {
     } else {
       this.identity = genTS3Identity(8);
     }
+    this.clientUid = getUidFromPublicKey(this.identity.publicKeyBase64());
   }
 
   /** The detected (or forced) server protocol after connect(). */
@@ -92,6 +142,8 @@ export class TS3Client extends EventEmitter {
   }
 
   async connect(): Promise<void> {
+    this.voiceEndpointResolver.reset();
+    this.clearVisibleClientUids();
     // Clean up any existing connection before creating a new one
     if (this.client) {
       this.logger.info("Cleaning up previous connection before reconnecting");
@@ -191,6 +243,7 @@ export class TS3Client extends EventEmitter {
       // Forward server password to the protocol library so it can be
       // included in clientinit for password-protected servers
       serverPassword: this.options.serverPassword,
+      resolver: this.voiceEndpointResolver,
       logger: {
         debug: (msg) => this.logger.debug(msg),
         info: (msg) => this.logger.info(msg),
@@ -200,27 +253,51 @@ export class TS3Client extends EventEmitter {
     });
 
     this.client.on("textMessage", (msg: TextMessage) => {
-      const tsMsg: TS3TextMessage = {
-        invokerName: msg.invokerName,
-        invokerId: String(msg.invokerID),
-        invokerUid: msg.invokerUID,
-        message: msg.message,
-        targetMode: msg.targetMode,
+      if (msg.invokerID === this.clientId) return;
+      this.emit("textMessage", toTS3TextMessage(msg));
+    });
+
+    this.client.on("voiceData", (voice: VoiceData) => {
+      // The library normally suppresses our own packets; retain the explicit
+      // guard so a future protocol change cannot make a bot duck itself.
+      if (voice.clientId === this.clientId) return;
+      const clientUid = this.visibleClientUids.get(voice.clientId);
+      const activity: TS3VoiceActivity = {
+        clientId: voice.clientId,
+        codec: voice.codec,
+        ...(clientUid ? { clientUid } : {}),
       };
-      this.emit("textMessage", tsMsg);
+      this.emit("voiceActivity", activity);
     });
 
     this.client.on("disconnected", (err) => {
       this.logger.warn({ err: err?.message }, "Connection closed");
       this.clientId = 0;
+      this.clearVisibleClientUids();
       this.emit("disconnected");
     });
 
     this.client.on("clientEnter", (info: ClientInfo) => {
+      this.rememberVisibleClientUid(info.id, info.uid);
       this.logger.debug(
         { nickname: info.nickname, id: info.id },
         "Client entered"
       );
+      this.emit("clientEnter", info);
+    });
+
+    this.client.on("clientLeave", (ev: ClientLeftViewEvent) => {
+      this.releaseVisibleClientUid(ev.id);
+      this.logger.debug({ id: ev.id }, "Client left");
+      this.emit("clientLeave", ev);
+    });
+
+    this.client.on("clientMoved", (ev: ClientMovedEvent) => {
+      this.logger.debug(
+        { id: ev.id, targetChannelID: ev.targetChannelID.toString() },
+        "Client moved"
+      );
+      this.emit("clientMoved", ev);
     });
 
     await this.client.connect();
@@ -238,8 +315,10 @@ export class TS3Client extends EventEmitter {
       `Logged in (visible client, ${this.detectedProtocol.toUpperCase()} server)`,
     );
 
-    // Join default channel if specified
-    if (this.options.defaultChannel) {
+    // Join channel by numeric ID (takes precedence) or by name
+    if (this.options.channelId) {
+      await this.joinChannel(this.options.channelId, this.options.channelPassword);
+    } else if (this.options.defaultChannel) {
       await this.joinChannel(
         this.options.defaultChannel,
         this.options.channelPassword
@@ -252,6 +331,17 @@ export class TS3Client extends EventEmitter {
   async joinChannel(channelName: string, password?: string): Promise<void> {
     if (!this.client) return;
 
+    const isNumeric = /^\d+$/.test(channelName);
+    if (isNumeric) {
+      try {
+        await clientMove(this.client, this.clientId, BigInt(channelName), password);
+        this.logger.info({ channelName }, "Joined channel");
+      } catch (err) {
+        this.logger.error({ err, channelName }, "Failed to join channel");
+      }
+      return;
+    }
+
     try {
       const channels = await listChannels(this.client);
       const channel = channels.find((ch) => ch.name === channelName);
@@ -261,12 +351,7 @@ export class TS3Client extends EventEmitter {
         return;
       }
 
-      await clientMove(
-        this.client,
-        this.clientId,
-        channel.id,
-        password
-      );
+      await clientMove(this.client, this.clientId, channel.id, password);
       this.logger.info(
         { channelName, cid: channel.id.toString() },
         "Joined channel"
@@ -297,6 +382,26 @@ export class TS3Client extends EventEmitter {
     }
   }
 
+  /**
+   * Resolve a client's CURRENT server groups by client id, server-wide (works
+   * regardless of channel/view) via a targeted `clientinfo` query. The raw
+   * `client_servergroups` field is a comma-separated list (same field
+   * `listClients` parses). Returns [] if the client can't be resolved or the
+   * query fails, so callers fail closed.
+   */
+  async getClientServerGroups(clid: number): Promise<string[]> {
+    if (!this.client) return [];
+    try {
+      const info = await getClientInfo(this.client, clid);
+      // `client_servergroups`: comma-separated server-group ids (verified in
+      // @honeybbq/teamspeak-client dist/index.mjs; listClients parses the same).
+      const raw = info.client_servergroups ?? "";
+      return raw ? raw.split(",") : [];
+    } catch {
+      return [];
+    }
+  }
+
   // --- Raw command & file transfer pass-through ---
 
   async execCommand(cmd: string): Promise<void> {
@@ -372,6 +477,52 @@ export class TS3Client extends EventEmitter {
     return this.clientId;
   }
 
+  /** Actual endpoint selected by the SDK's SRV/TSDNS discovery and DNS lookup. */
+  getResolvedVoiceEndpoint(): ResolvedVoiceEndpoint | null {
+    return this.voiceEndpointResolver.getEndpoint();
+  }
+
+  /** Stable identity of this managed TeamSpeak client. */
+  getClientUid(): string {
+    return this.clientUid;
+  }
+
+  private rememberVisibleClientUid(clientId: number, clientUid: string): void {
+    const pendingRelease = this.visibleClientUidReleaseTimers.get(clientId);
+    if (pendingRelease) clearTimeout(pendingRelease);
+    this.visibleClientUidReleaseTimers.delete(clientId);
+
+    if (clientId > 0 && clientUid) {
+      this.visibleClientUids.set(clientId, clientUid);
+    } else {
+      this.visibleClientUids.delete(clientId);
+    }
+  }
+
+  private releaseVisibleClientUid(clientId: number): void {
+    const clientUid = this.visibleClientUids.get(clientId);
+    if (!clientUid) return;
+
+    const previous = this.visibleClientUidReleaseTimers.get(clientId);
+    if (previous) clearTimeout(previous);
+    const timer = setTimeout(() => {
+      if (this.visibleClientUids.get(clientId) === clientUid) {
+        this.visibleClientUids.delete(clientId);
+      }
+      this.visibleClientUidReleaseTimers.delete(clientId);
+    }, VISIBLE_CLIENT_UID_RELEASE_GRACE_MS);
+    timer.unref?.();
+    this.visibleClientUidReleaseTimers.set(clientId, timer);
+  }
+
+  private clearVisibleClientUids(): void {
+    for (const timer of this.visibleClientUidReleaseTimers.values()) {
+      clearTimeout(timer);
+    }
+    this.visibleClientUidReleaseTimers.clear();
+    this.visibleClientUids.clear();
+  }
+
   disconnect(): void {
     if (this.client && !this.disconnecting) {
       this.disconnecting = true;
@@ -384,6 +535,7 @@ export class TS3Client extends EventEmitter {
       });
     }
     this.clientId = 0;
+    this.clearVisibleClientUids();
     this.httpQuery = null;
     this.detectedProtocol = "unknown";
     if (this.udpErrorTimer) {

src/ts-protocol/text-message.test.ts

@@ -0,0 +1,43 @@
+import { describe, it, expect } from "vitest";
+import { toTS3TextMessage } from "./client.js";
+import type { TextMessage } from "@honeybbq/teamspeak-client";
+
+function makeMsg(over: Partial<TextMessage> = {}): TextMessage {
+  return {
+    invokerName: "Alice",
+    invokerUID: "uid-abc",
+    message: "!stop",
+    invokerGroups: ["6", "8"],
+    targetMode: 2,
+    targetID: 0n,
+    invokerID: 5,
+    ...over,
+  };
+}
+
+describe("toTS3TextMessage", () => {
+  it("maps core fields and stringifies invokerID", () => {
+    const r = toTS3TextMessage(makeMsg());
+    expect(r.invokerName).toBe("Alice");
+    expect(r.invokerId).toBe("5");
+    expect(r.invokerUid).toBe("uid-abc");
+    expect(r.message).toBe("!stop");
+    expect(r.targetMode).toBe(2);
+  });
+
+  it("preserves the sender's server groups", () => {
+    expect(toTS3TextMessage(makeMsg({ invokerGroups: ["6"] })).invokerGroups).toEqual(["6"]);
+  });
+
+  it("defaults missing invokerGroups to an empty array", () => {
+    const partial = {
+      invokerName: "Bob",
+      invokerUID: "u",
+      message: "!stop",
+      targetMode: 1,
+      targetID: 0n,
+      invokerID: 7,
+    } as unknown as TextMessage;
+    expect(toTS3TextMessage(partial).invokerGroups).toEqual([]);
+  });
+});

src/ts-protocol/voice-endpoint.test.ts

@@ -0,0 +1,79 @@
+import { describe, expect, it, vi } from "vitest";
+import type { AddrResolver, ResolvedAddr } from "@honeybbq/teamspeak-client";
+import { TrackingVoiceEndpointResolver } from "./voice-endpoint.js";
+
+function result(addr: string): ResolvedAddr {
+  return { addr, source: "test", expiry: new Date(0) };
+}
+
+function delegate(...addresses: string[]): AddrResolver {
+  return {
+    resolve: vi.fn(async () => addresses.map(result)),
+  };
+}
+
+describe("TrackingVoiceEndpointResolver", () => {
+  it("pins a DNS alias to the IPv4 endpoint used by the UDP connection", async () => {
+    const resolveHost = vi.fn(async () => "203.0.113.20");
+    const resolver = new TrackingVoiceEndpointResolver(
+      delegate("voice-alias.example.com:9987"),
+      resolveHost,
+    );
+
+    const resolved = await resolver.resolve("voice.example.com:9987");
+
+    expect(resolveHost).toHaveBeenCalledWith("voice-alias.example.com");
+    expect(resolved[0]?.addr).toBe("203.0.113.20:9987");
+    expect(resolver.getEndpoint()).toEqual({ host: "203.0.113.20", port: 9987 });
+  });
+
+  it("preserves the port chosen by SRV/TSDNS discovery", async () => {
+    const resolver = new TrackingVoiceEndpointResolver(
+      delegate("srv-target.example.com:12000"),
+      async () => "198.51.100.8",
+    );
+
+    expect((await resolver.resolve("voice.example.com:9987"))[0]?.addr).toBe(
+      "198.51.100.8:12000",
+    );
+    expect(resolver.getEndpoint()?.port).toBe(12000);
+  });
+
+  it("keeps the SDK target as a safe fallback when A-record lookup fails", async () => {
+    const original = "voice.example.com:9987";
+    const resolver = new TrackingVoiceEndpointResolver(
+      delegate(original),
+      async () => {
+        throw new Error("dns unavailable");
+      },
+    );
+
+    expect((await resolver.resolve(original))[0]?.addr).toBe(original);
+    expect(resolver.getEndpoint()).toEqual({ host: "voice.example.com", port: 9987 });
+  });
+
+  it("does not mutate secondary SDK candidates", async () => {
+    const resolver = new TrackingVoiceEndpointResolver(
+      delegate("first.example.com:9987", "second.example.com:9988"),
+      async () => "192.0.2.4",
+    );
+
+    const resolved = await resolver.resolve("voice.example.com:9987");
+    expect(resolved.map((candidate) => candidate.addr)).toEqual([
+      "192.0.2.4:9987",
+      "second.example.com:9988",
+    ]);
+  });
+
+  it("clears the observed endpoint before a reconnect", async () => {
+    const resolver = new TrackingVoiceEndpointResolver(
+      delegate("voice.example.com:9987"),
+      async () => "192.0.2.5",
+    );
+    await resolver.resolve("voice.example.com:9987");
+
+    resolver.reset();
+
+    expect(resolver.getEndpoint()).toBeNull();
+  });
+});

src/ts-protocol/voice-endpoint.ts

@@ -0,0 +1,104 @@
+import { lookup } from "node:dns/promises";
+import { isIP } from "node:net";
+import { Resolver } from "@honeybbq/teamspeak-client/discovery";
+import type {
+  AddrResolver,
+  ResolvedAddr,
+} from "@honeybbq/teamspeak-client";
+
+export interface ResolvedVoiceEndpoint {
+  host: string;
+  port: number;
+}
+
+type ResolveIpv4 = (host: string) => Promise<string>;
+
+function parseVoiceAddress(address: string): ResolvedVoiceEndpoint | null {
+  let host: string;
+  let rawPort: string;
+
+  if (address.startsWith("[")) {
+    const closingBracket = address.indexOf("]");
+    if (closingBracket < 0 || address[closingBracket + 1] !== ":") return null;
+    host = address.slice(1, closingBracket);
+    rawPort = address.slice(closingBracket + 2);
+  } else {
+    const separator = address.lastIndexOf(":");
+    if (separator <= 0) return null;
+    host = address.slice(0, separator);
+    rawPort = address.slice(separator + 1);
+  }
+
+  const port = Number(rawPort);
+  if (
+    host.length === 0 ||
+    !Number.isInteger(port) ||
+    port < 1 ||
+    port > 65_535
+  ) {
+    return null;
+  }
+  return { host, port };
+}
+
+function formatVoiceAddress(endpoint: ResolvedVoiceEndpoint): string {
+  return endpoint.host.includes(":")
+    ? `[${endpoint.host}]:${endpoint.port}`
+    : `${endpoint.host}:${endpoint.port}`;
+}
+
+async function resolveIpv4(host: string): Promise<string> {
+  if (isIP(host) === 4) return host;
+  return (await lookup(host, { family: 4 })).address;
+}
+
+/**
+ * Uses the SDK's normal SRV/TSDNS discovery, then pins its selected hostname
+ * to the IPv4 address that the UDP connection will use. Besides making the
+ * connection target observable, this gives all bots a common registry scope
+ * when one is configured with a DNS alias and another with the underlying IP.
+ */
+export class TrackingVoiceEndpointResolver implements AddrResolver {
+  private endpoint: ResolvedVoiceEndpoint | null = null;
+
+  constructor(
+    private readonly delegate: AddrResolver = new Resolver(),
+    private readonly resolveHost: ResolveIpv4 = resolveIpv4,
+  ) {}
+
+  async resolve(input: string, signal?: AbortSignal): Promise<ResolvedAddr[]> {
+    this.endpoint = null;
+    const candidates = await this.delegate.resolve(input, signal);
+    const selected = candidates[0];
+    if (!selected) return candidates;
+
+    const parsed = parseVoiceAddress(selected.addr);
+    if (!parsed) return candidates;
+
+    try {
+      const pinned = {
+        host: await this.resolveHost(parsed.host),
+        port: parsed.port,
+      };
+      this.endpoint = pinned;
+      return [
+        { ...selected, addr: formatVoiceAddress(pinned) },
+        ...candidates.slice(1),
+      ];
+    } catch {
+      // Preserve the SDK's original target if local A-record resolution fails.
+      // The connection may still succeed through platform-specific resolution;
+      // the registry then falls back to the logical host + resolved port.
+      this.endpoint = parsed;
+      return candidates;
+    }
+  }
+
+  reset(): void {
+    this.endpoint = null;
+  }
+
+  getEndpoint(): ResolvedVoiceEndpoint | null {
+    return this.endpoint ? { ...this.endpoint } : null;
+  }
+}

src/web/api/audit.test.ts

@@ -7,6 +7,7 @@ import { createUserStore } from "../../data/users.js";
 import { createSessionStore } from "../../data/sessions.js";
 import { createAuditStore } from "../../data/audit.js";
 import { createPermissionStore } from "../../data/permissions.js";
+import { getDefaultConfig } from "../../data/config.js";
 import { createRequireAuth } from "../middleware/requireAuth.js";
 import { createAuditRouter } from "./audit.js";
 import { SESSION_COOKIE_NAME } from "../auth/validateSession.js";
@@ -34,7 +35,7 @@ describe("audit router", () => {
     app = express();
     app.use(express.json());
     app.use(cookieParser());
-    app.use("/api", createRequireAuth(sessions, permissions));
+    app.use("/api", createRequireAuth(sessions, permissions, () => getDefaultConfig().guestMode));
     app.use("/api/audit", createAuditRouter(audit));
   });
 

src/web/api/auth.test.ts

@@ -0,0 +1,74 @@
+import { describe, it, expect, vi } from "vitest";
+import express from "express";
+import request from "supertest";
+import pino from "pino";
+import type { MusicProvider } from "../../music/provider.js";
+import { getDefaultConfig, type JellyfinConfig } from "../../data/config.js";
+import { createAuthRouter } from "./auth.js";
+
+function fakeProvider(platform: MusicProvider["platform"]): MusicProvider {
+  return { platform } as unknown as MusicProvider;
+}
+
+describe("auth router POST /jellyfin/test", () => {
+  function mount(
+    stored: Partial<JellyfinConfig>,
+    user: unknown = { role: "admin" },
+  ) {
+    const config = getDefaultConfig();
+    Object.assign(config.jellyfin, stored);
+    const testConnection = vi.fn().mockResolvedValue({ ok: true, serverName: "JF" });
+    const jellyfin = { platform: "jellyfin", testConnection } as unknown as MusicProvider;
+    const app = express();
+    app.use(express.json());
+    app.use((req, _res, next) => { (req as { user?: unknown }).user = user; next(); });
+    app.use(
+      "/api/auth",
+      createAuthRouter(
+        fakeProvider("netease"), fakeProvider("qq"), fakeProvider("bilibili"),
+        pino({ level: "silent" }), undefined, undefined, undefined, jellyfin, config,
+      ),
+    );
+    return { app, testConnection };
+  }
+
+  it("fills empty credential fields from the stored config (masked password case)", async () => {
+    const { app, testConnection } = mount({
+      serverUrl: "https://old.example.com",
+      username: "bob",
+      password: "stored-pw",
+    });
+    const res = await request(app)
+      .post("/api/auth/jellyfin/test")
+      .send({ serverUrl: "https://new.example.com", username: "bob", password: "" });
+    expect(res.status).toBe(200);
+    expect(res.body.ok).toBe(true);
+    expect(testConnection).toHaveBeenCalledWith(
+      expect.objectContaining({
+        serverUrl: "https://new.example.com",
+        username: "bob",
+        password: "stored-pw",
+      }),
+    );
+  });
+
+  it("passes freshly entered credentials through", async () => {
+    const { app, testConnection } = mount({});
+    await request(app).post("/api/auth/jellyfin/test").send({
+      serverUrl: "https://jf.example.com",
+      authMode: "apikey",
+      apiKey: "key123",
+      userId: "u1",
+    });
+    expect(testConnection).toHaveBeenCalledWith(
+      expect.objectContaining({ authMode: "apikey", apiKey: "key123", userId: "u1" }),
+    );
+  });
+
+  it("is 403 for a member lacking platform.auth", async () => {
+    const { app, testConnection } = mount({}, { role: "member", capabilities: new Set([]) });
+    const res = await request(app).post("/api/auth/jellyfin/test").send({});
+    expect(res.status).toBe(403);
+    expect(testConnection).not.toHaveBeenCalled();
+  });
+});