refactor(web): 删掉 y-webrtc 协同编辑的旧实现

sync.ts / syncStatus.ts、y-webrtc 依赖、PUBLIC_SIGNALING_URL 全部移除，
外部信令服务器 signaling.xuyue.cc 不再被使用。
顺带修掉 CLAUDE.md 里「协作在流程图编辑器」这句一直是错的描述。

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016DHxhKNxXfG89JnVzHbvgj

apps/web/.env.production

@@ -2,5 +2,4 @@ PUBLIC_ENV=xuyue.cc
 PUBLIC_MAXKB_URL=https://maxkb.xuyue.cc/chat/api/embed?protocol=https&host=maxkb.xuyue.cc&token=dd37457027c40b39
 PUBLIC_CODE_URL=https://code.xuyue.cc
 PUBLIC_JUDGE0_URL=https://judge0api.xuyue.cc
-PUBLIC_SIGNALING_URL=wss://signaling.xuyue.cc
 PUBLIC_ICONIFY_URL=https://icon.xuyue.cc

apps/web/.env.staging

@@ -3,4 +3,3 @@ PUBLIC_MAXKB_URL=http://10.13.114.114:92/chat/api/embed?protocol=http&host=10.13
 PUBLIC_CODE_URL=http://10.13.114.114:82
 PUBLIC_JUDGE0_URL=http://10.13.114.114:8082
 PUBLIC_ICONIFY_URL=http://10.13.114.114:8098
-PUBLIC_SIGNALING_URL=ws://10.13.114.114:8085

apps/web/.env.test

@@ -3,4 +3,3 @@ PUBLIC_MAXKB_URL=http://10.13.114.114:92/chat/api/embed?protocol=http&host=10.13
 PUBLIC_CODE_URL=http://10.13.114.114:82
 PUBLIC_JUDGE0_URL=http://10.13.114.114:8082
 PUBLIC_ICONIFY_URL=http://10.13.114.114:8098
-PUBLIC_SIGNALING_URL=ws://10.13.114.114:8085

apps/web/CLAUDE.md

@@ -41,8 +41,8 @@ Each feature module (under `oj/` or `admin/`) typically has:
 - `api.ts` — API calls specific to the feature
 
 Shared logic lives in `shared/`:
-- `store/` — Pinia stores: `user` (auth/roles), `config` (site-wide settings), `authModal` (login/signup form state), `screenMode` (problem split-screen layout), `loginSummary` (AI activity summary)
+- `store/` — Pinia stores: `user` (auth/roles), `config` (site-wide settings), `authModal` (login/signup form state), `screenMode` (problem split-screen layout), `loginSummary` (AI activity summary), `collab` (help-request queue + collab room)
-- `composables/` — `pagination` (URL-synced), `websocket` (reconnect + heartbeat), `sync` (Yjs/y-webrtc for collaborative editing), `configUpdate` (WS-pushed config sync), `useMermaid` (lazy Mermaid render), `breakpoints`, `maxkb`
+- `composables/` — `pagination` (URL-synced), `websocket` (reconnect + heartbeat), `collabDoc` (Yjs binding for the collab channel), `configUpdate` (WS-pushed config sync), `useMermaid` (lazy Mermaid render), `breakpoints`, `maxkb`
 - `layout/` — `default.vue` and `admin.vue` layout wrappers
 - `api.ts` — shared API calls (auth, profile, tags, captcha)
 
@@ -94,7 +94,6 @@ Variables prefixed with `PUBLIC_` are injected at build time. Env files: `.env`,
 | `PUBLIC_CODE_URL` | Code execution service |
 | `PUBLIC_JUDGE0_URL` | Judge0 API |
 | `PUBLIC_MAXKB_URL` | Knowledge base service |
-| `PUBLIC_SIGNALING_URL` | WebRTC signaling server |
 | `PUBLIC_ICONIFY_URL` | Iconify icon CDN |
 
 ### Routing
@@ -107,7 +106,10 @@ Routes are defined in `src/routes.ts` with two root routes: `ojs` (user-facing)
 ### Real-time Features
 
 - WebSocket via composable in `shared/composables/` for submission status updates
-- Yjs + y-webrtc for collaborative editing in the flowchart editor
+- Yjs over the `/ws/collab` channel for classroom help requests and collaborative
+  code editing (students raise a hand, teachers join their editor). The server is a
+  dumb relay — it authenticates, assigns rooms, and forwards frames without parsing
+  them. See `docs/specs/2026-08-28-collab-help-request-design.md`.
 
 ## Related Repository
 

apps/web/package.json

@@ -54,7 +54,6 @@
     "vue-router": "^5.2.0",
     "y-codemirror.next": "^0.3.6",
     "y-protocols": "1.0.7",
-    "y-webrtc": "^10.3.0",
     "yjs": "^13.6.32"
   },
   "devDependencies": {

apps/web/src/env.d.ts

@@ -6,7 +6,6 @@ interface ImportMetaEnv {
   readonly PUBLIC_CODE_URL: string
   readonly PUBLIC_JUDGE0_URL: string
   readonly PUBLIC_ICONIFY_URL: string
-  readonly PUBLIC_SIGNALING_URL: string
 }
 
 interface ImportMeta {

apps/web/src/oj/composables/syncStatus.ts

@@ -1,73 +0,0 @@
-import { ref, provide, inject } from "vue"
-
-/**
- * 同步状态管理 composable
- * 使用 provide/inject 模式在组件树中共享状态
- */
-
-export interface SyncStatusState {
-  hadConnection: boolean
-  otherUser?: { name: string; isSuperAdmin: boolean }
-  lastLeftUser?: { name: string; isSuperAdmin: boolean } // 保存离开之人的信息
-}
-
-// 提供/注入的 key
-export const SYNC_STATUS_KEY = Symbol("syncStatus")
-
-/**
- * 创建同步状态实例
- * 每次调用创建新的状态实例
- */
-export function createSyncStatus() {
-  const otherUser = ref<{ name: string; isSuperAdmin: boolean }>()
-  const hadConnection = ref(false)
-  const lastLeftUser = ref<{ name: string; isSuperAdmin: boolean }>()
-
-  const setOtherUser = (user?: { name: string; isSuperAdmin: boolean }) => {
-    // 如果之前有其他用户，现在没有了，说明用户离开了
-    if (otherUser.value && !user) {
-      lastLeftUser.value = otherUser.value
-    }
-    otherUser.value = user
-    if (user) {
-      hadConnection.value = true
-    }
-  }
-
-  const reset = () => {
-    otherUser.value = undefined
-    hadConnection.value = false
-    lastLeftUser.value = undefined
-  }
-
-  return {
-    otherUser,
-    hadConnection,
-    lastLeftUser,
-    setOtherUser,
-    reset,
-  }
-}
-
-/**
- * 提供同步状态到子组件
- * 在父组件中调用
- */
-export function provideSyncStatus() {
-  const syncStatus = createSyncStatus()
-  provide(SYNC_STATUS_KEY, syncStatus)
-  return syncStatus
-}
-
-/**
- * 注入同步状态
- * 在子组件中调用，获取父组件提供的状态
- */
-export function injectSyncStatus() {
-  const syncStatus =
-    inject<ReturnType<typeof createSyncStatus>>(SYNC_STATUS_KEY)
-  if (!syncStatus) {
-    throw new Error("syncStatus must be provided by a parent component")
-  }
-  return syncStatus
-}

apps/web/src/oj/problem/components/ContestEditor.vue

@@ -5,7 +5,6 @@ import { useProblemStore } from "oj/store/problem"
 import { SOURCES } from "utils/constants"
 import CodeEditor from "shared/components/CodeEditor.vue"
 import { useBreakpoints } from "shared/composables/breakpoints"
-import { provideSyncStatus } from "oj/composables/syncStatus"
 import storage from "utils/storage"
 import type { LANGUAGE } from "utils/types"
 import Form from "./Form.vue"
@@ -18,10 +17,6 @@ const { problem } = storeToRefs(problemStore)
 
 const { isDesktop } = useBreakpoints()
 
-// 提供空的同步状态，避免 Form 组件注入错误
-// 在竞赛模式下，同步功能会被 showSyncFeature 自动禁用
-provideSyncStatus()
-
 const contestID = route.params.contestID || null
 const storageKey = computed(
   () =>

apps/web/src/shared/composables/sync.ts

@@ -1,412 +0,0 @@
-import { useMessage } from "naive-ui"
-import { useUserStore } from "../store/user"
-import type { EditorView } from "@codemirror/view"
-import { Compartment } from "@codemirror/state"
-import type { WebrtcProvider } from "y-webrtc"
-import type { Doc, Text } from "yjs"
-
-// 常量定义
-const SYNC_CONSTANTS = {
-  MAX_ROOM_USERS: 2,
-  AWARENESS_SYNC_DELAY: 500,
-  INIT_SYNC_TIMEOUT: 500,
-  SUPER_ADMIN_COLOR: "#ff6b6b",
-  REGULAR_USER_COLOR: "#4dabf7",
-} as const
-
-// 错误类型码
-export const SYNC_ERROR_CODES = {
-  SUPER_ADMIN_LEFT: "SUPER_ADMIN_LEFT",
-  MISSING_SUPER_ADMIN: "MISSING_SUPER_ADMIN",
-} as const
-
-// 界面和通知文案
-export const SYNC_MESSAGES = {
-  // 超管离开
-  SUPER_ADMIN_LEFT: (name: string) => `超管 ${name} 已离开`,
-
-  // 缺少超管
-  MISSING_SUPER_ADMIN: "协同编辑需要超管",
-
-  // 连接成功
-  SYNC_ACTIVE: "协同编辑已激活！",
-
-  // 连接断开
-  CONNECTION_LOST: "协同编辑已断开",
-
-  // 等待相关
-  WAITING_STUDENT: "正在等待学生加入...",
-  WAITING_ADMIN: "正在等待超管加入...",
-
-  // Form.vue 界面文案
-  SYNC_ON: "断开同步",
-  SYNC_OFF: "开启同步",
-  SYNCING_WITH: (name: string) => `与 ${name} 同步中`,
-  STUDENT_LEFT: (name?: string) => (name ? `${name}已离开` : "可以关闭同步"),
-} as const
-
-// 类型定义
-type SyncState = "waiting" | "active" | "error"
-type SyncErrorCode = (typeof SYNC_ERROR_CODES)[keyof typeof SYNC_ERROR_CODES]
-
-interface UserInfo {
-  name: string
-  isSuperAdmin: boolean
-}
-
-interface PeersEvent {
-  webrtcPeers: string[]
-}
-
-interface StatusEvent {
-  connected: boolean
-}
-
-interface SyncedEvent {
-  synced: boolean
-}
-
-interface SyncOptions {
-  problemId: string
-  editorView: EditorView
-  onStatusChange?: (status: SyncStatus) => void
-}
-
-export interface SyncStatus {
-  connected: boolean
-  roomUsers: number
-  canSync: boolean
-  message: string
-  error?: string
-  errorCode?: SyncErrorCode
-  otherUser?: UserInfo
-}
-
-/**
- * 代码同步 composable
- * 每次调用创建新的同步实例
- */
-export function useCodeSync() {
-  const userStore = useUserStore()
-  const message = useMessage()
-
-  // 每次调用创建新的实例变量
-  let ydoc: Doc | null = null
-  let provider: WebrtcProvider | null = null
-  let ytext: Text | null = null
-  const collabCompartment = new Compartment()
-  let currentEditorView: EditorView | null = null
-  let lastSyncState: SyncState | null = null
-  let roomUserInfo = new Map<number, UserInfo>()
-  let hasShownSuperAdminLeftMessage = false
-
-  const updateStatus = (
-    status: SyncStatus,
-    onStatusChange?: (status: SyncStatus) => void,
-  ) => {
-    onStatusChange?.(status)
-  }
-
-  const normalizeClientId = (clientId: number | string): number => {
-    return typeof clientId === "string" ? parseInt(clientId, 10) : clientId
-  }
-
-  const checkHasSuperAdmin = (awarenessStates: Map<number, any>): boolean => {
-    if (userStore.isSuperAdmin) return true
-    return Array.from(awarenessStates.values()).some(
-      (state) => state.user?.isSuperAdmin,
-    )
-  }
-
-  const getOtherUserInfo = (
-    awarenessStates: Map<number, any>,
-  ): UserInfo | undefined => {
-    if (!provider) return undefined
-
-    const localClientId = provider.awareness.clientID
-    for (const [clientId, state] of awarenessStates) {
-      if (clientId !== localClientId && state.user) {
-        return {
-          name: state.user.name,
-          isSuperAdmin: state.user.isSuperAdmin,
-        }
-      }
-    }
-    return undefined
-  }
-
-  const checkIfSuperAdminLeft = (
-    removedClientIds: number[],
-    onStatusChange?: (status: SyncStatus) => void,
-  ) => {
-    if (userStore.isSuperAdmin || hasShownSuperAdminLeftMessage) return
-
-    const superAdminInfo = removedClientIds
-      .map((id) => roomUserInfo.get(id))
-      .find((info) => info?.isSuperAdmin)
-
-    if (superAdminInfo) {
-      hasShownSuperAdminLeftMessage = true
-      const leftMessage = SYNC_MESSAGES.SUPER_ADMIN_LEFT(superAdminInfo.name)
-      updateStatus(
-        {
-          connected: false,
-          roomUsers: 0,
-          canSync: false,
-          message: leftMessage,
-          error: leftMessage,
-          errorCode: SYNC_ERROR_CODES.SUPER_ADMIN_LEFT,
-        },
-        onStatusChange,
-      )
-      message.warning(leftMessage)
-      stopSync()
-    }
-  }
-
-  const checkRoomPermissions = (
-    roomUsers: number,
-    onStatusChange?: (status: SyncStatus) => void,
-  ) => {
-    const awarenessStates = provider?.awareness.getStates()
-    if (!awarenessStates) return
-
-    const hasSuperAdmin = checkHasSuperAdmin(awarenessStates)
-    const canSync = roomUsers === SYNC_CONSTANTS.MAX_ROOM_USERS && hasSuperAdmin
-    const otherUser = getOtherUserInfo(awarenessStates)
-
-    if (roomUsers === SYNC_CONSTANTS.MAX_ROOM_USERS && !hasSuperAdmin) {
-      if (lastSyncState === "error") return
-
-      updateStatus(
-        {
-          connected: false,
-          roomUsers,
-          canSync: false,
-          message: SYNC_MESSAGES.MISSING_SUPER_ADMIN,
-          error: SYNC_MESSAGES.MISSING_SUPER_ADMIN,
-          errorCode: SYNC_ERROR_CODES.MISSING_SUPER_ADMIN,
-          otherUser,
-        },
-        onStatusChange,
-      )
-      message.error(SYNC_MESSAGES.MISSING_SUPER_ADMIN)
-      lastSyncState = "error"
-      stopSync()
-      return
-    } else if (canSync) {
-      updateStatus(
-        {
-          connected: true,
-          roomUsers,
-          canSync: true,
-          message: SYNC_MESSAGES.SYNC_ACTIVE,
-          otherUser,
-        },
-        onStatusChange,
-      )
-      if (lastSyncState !== "active") {
-        message.success(SYNC_MESSAGES.SYNC_ACTIVE)
-        lastSyncState = "active"
-      }
-    } else {
-      updateStatus(
-        {
-          connected: true,
-          roomUsers,
-          canSync: false,
-          message:
-            roomUsers === 1
-              ? SYNC_MESSAGES.WAITING_STUDENT
-              : SYNC_MESSAGES.WAITING_ADMIN,
-          otherUser,
-        },
-        onStatusChange,
-      )
-      lastSyncState = "waiting"
-    }
-  }
-
-  const setupContentSync = (
-    ytext: Text,
-    provider: WebrtcProvider,
-    savedContent: string,
-  ) => {
-    let hasInitialized = false
-
-    const initTimeout = setTimeout(() => {
-      if (!hasInitialized && ytext.length === 0 && savedContent) {
-        ytext.insert(0, savedContent)
-      }
-      hasInitialized = true
-    }, SYNC_CONSTANTS.INIT_SYNC_TIMEOUT)
-
-    provider.on("synced", (event: SyncedEvent) => {
-      if (!event.synced || hasInitialized) return
-
-      clearTimeout(initTimeout)
-      if (ytext.length === 0 && savedContent) {
-        ytext.insert(0, savedContent)
-      }
-      hasInitialized = true
-    })
-  }
-
-  async function startSync(options: SyncOptions): Promise<() => void> {
-    const { problemId, editorView, onStatusChange } = options
-
-    if (!userStore.isAuthed) {
-      return () => {}
-    }
-
-    // 动态导入 yjs 相关模块
-    const [Y, { WebrtcProvider }, { yCollab }] = await Promise.all([
-      import("yjs"),
-      import("y-webrtc"),
-      import("y-codemirror.next"),
-    ])
-
-    // 初始化文档和提供者
-    ydoc = new Y.Doc()
-    ytext = ydoc.getText("codemirror")
-    const roomName = `problem-${problemId}`
-
-    provider = new WebrtcProvider(roomName, ydoc, {
-      signaling: [import.meta.env.PUBLIC_SIGNALING_URL],
-      maxConns: 1,
-      filterBcConns: true,
-    })
-
-    // 监听连接状态
-    provider.on("status", (event: StatusEvent) => {
-      if (!event.connected) {
-        updateStatus(
-          {
-            connected: false,
-            roomUsers: 0,
-            canSync: false,
-            message: SYNC_MESSAGES.CONNECTION_LOST,
-            error: SYNC_MESSAGES.CONNECTION_LOST,
-          },
-          onStatusChange,
-        )
-        message.warning(SYNC_MESSAGES.CONNECTION_LOST)
-      }
-    })
-
-    // 监听用户加入/离开
-    provider.on("peers", (event: PeersEvent) => {
-      const roomUsers = event.webrtcPeers.length + 1
-      setTimeout(() => {
-        checkRoomPermissions(roomUsers, onStatusChange)
-      }, SYNC_CONSTANTS.AWARENESS_SYNC_DELAY)
-    })
-
-    // 监听 awareness 变化
-    provider.awareness.on("change", (changes: any) => {
-      if (!provider) return
-
-      const awarenessStates = provider.awareness.getStates()
-
-      if (changes.removed?.length > 0) {
-        checkIfSuperAdminLeft(changes.removed, onStatusChange)
-      }
-
-      awarenessStates.forEach((state, clientId) => {
-        if (state.user) {
-          const normalizedId = normalizeClientId(clientId)
-          roomUserInfo.set(normalizedId, {
-            name: state.user.name,
-            isSuperAdmin: state.user.isSuperAdmin,
-          })
-        }
-      })
-
-      checkRoomPermissions(awarenessStates.size, onStatusChange)
-    })
-
-    // 配置编辑器扩展
-    if (editorView && ytext) {
-      currentEditorView = editorView
-      const userColor = userStore.isSuperAdmin
-        ? SYNC_CONSTANTS.SUPER_ADMIN_COLOR
-        : SYNC_CONSTANTS.REGULAR_USER_COLOR
-      const userName = userStore.user?.username || "匿名用户"
-      const savedContent = editorView.state.doc.toString()
-
-      // 设置用户信息
-      provider.awareness.setLocalStateField("user", {
-        name: userName,
-        color: userColor,
-        isSuperAdmin: userStore.isSuperAdmin,
-      })
-
-      // 清空编辑器并应用协同扩展
-      editorView.dispatch({
-        changes: { from: 0, to: editorView.state.doc.length, insert: "" },
-      })
-
-      const collabExt = yCollab(ytext, provider.awareness)
-      editorView.dispatch({
-        effects: collabCompartment.reconfigure(collabExt),
-      })
-
-      // 设置内容同步
-      setupContentSync(ytext, provider, savedContent)
-
-      // 设置初始状态
-      const waitingMessage = userStore.isSuperAdmin
-        ? SYNC_MESSAGES.WAITING_STUDENT
-        : SYNC_MESSAGES.WAITING_ADMIN
-
-      updateStatus(
-        {
-          connected: true,
-          roomUsers: 1,
-          canSync: false,
-          message: waitingMessage,
-        },
-        onStatusChange,
-      )
-
-      message.info(waitingMessage)
-      lastSyncState = "waiting"
-    }
-
-    return () => stopSync()
-  }
-
-  function stopSync() {
-    if (currentEditorView) {
-      try {
-        currentEditorView.dispatch({
-          effects: collabCompartment.reconfigure([]),
-        })
-      } catch (error) {
-        console.warn("移除协同编辑扩展失败:", error)
-      }
-      currentEditorView = null
-    }
-
-    provider?.disconnect()
-    provider?.destroy()
-    ydoc?.destroy()
-
-    provider = null
-    ydoc = null
-    ytext = null
-    lastSyncState = null
-    roomUserInfo.clear()
-    hasShownSuperAdminLeftMessage = false
-  }
-
-  function getInitialExtension() {
-    return collabCompartment.of([])
-  }
-
-  return {
-    startSync,
-    stopSync,
-    getInitialExtension,
-  }
-}

bun.lock

@@ -81,7 +81,6 @@
         "vue-router": "^5.2.0",
         "y-codemirror.next": "^0.3.6",
         "y-protocols": "1.0.7",
-        "y-webrtc": "^10.3.0",
         "yjs": "^13.6.32",
       },
       "devDependencies": {
@@ -823,8 +822,6 @@
 
     "babel-plugin-polyfill-regenerator": ["babel-plugin-polyfill-regenerator@0.6.8", "https://registry.npmjs.com/babel-plugin-polyfill-regenerator/-/babel-plugin-polyfill-regenerator-0.6.8.tgz", { "dependencies": { "@babel/helper-define-polyfill-provider": "^0.6.8" }, "peerDependencies": { "@babel/core": "^7.4.0 || ^8.0.0-0 <8.0.0" } }, "sha512-M762rNHfSF1EV3SLtnCJXFoQbbIIz0OyRwnCmV0KPC7qosSfCO0QLTSuJX3ayAebubhE6oYBAYPrBA5ljowaZg=="],
 
-    "base64-js": ["base64-js@1.5.1", "https://registry.npmjs.com/base64-js/-/base64-js-1.5.1.tgz", {}, "sha512-AKpaYlHn8t4SVbOHCy+b5+KKgvR4vrsD8vbvrbiQJps7fKDTkjkDry6ji0rUJjC0kzbNePLwzxq8iypo41qeWA=="],
-
     "baseline-browser-mapping": ["baseline-browser-mapping@2.11.12", "https://registry.npmjs.com/baseline-browser-mapping/-/baseline-browser-mapping-2.11.12.tgz", { "bin": { "baseline-browser-mapping": "dist/cli.cjs" } }, "sha512-r7WnVImvVCeFpf2DOXfy41aPWzeNg3H/A2X4dKmy1QL0MSyyk/e7z8ihJ3N6Nn2PsdhkVlqnEfnUE4a05P2aTA=="],
 
     "birpc": ["birpc@2.9.0", "https://registry.npmjs.com/birpc/-/birpc-2.9.0.tgz", {}, "sha512-KrayHS5pBi69Xi9JmvoqrIgYGDkD6mcSe/i6YKi3w5kekCLzrX4+nawcXqrj2tIp50Kw/mT/s3p+GVK0A0sKxw=="],
@@ -833,8 +830,6 @@
 
     "browserslist-to-esbuild": ["browserslist-to-esbuild@2.1.1", "https://registry.npmjs.com/browserslist-to-esbuild/-/browserslist-to-esbuild-2.1.1.tgz", { "dependencies": { "meow": "^13.0.0" }, "peerDependencies": { "browserslist": "*" }, "bin": { "browserslist-to-esbuild": "cli/index.js" } }, "sha512-KN+mty6C3e9AN8Z5dI1xeN15ExcRNeISoC3g7V0Kax/MMF9MSoYA2G7lkTTcVUFntiEjkpI0HNgqJC1NjdyNUw=="],
 
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