Add Express server with WebSocket, CORS, and room routes

Set up the HTTP server with Express, attach Socket.IO for real-time messaging, add CORS middleware, async error handling utility, and REST routes for room join/leave/messages/participants. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-03-18 16:53:13 +01:00
parent e0d53d6e74
commit 19eba1eebd
6 changed files with 302 additions and 0 deletions
@@ -0,0 +1,126 @@
+const express = require('express')
+const { randomUUID } = require('crypto')
+const asyncHandler = require('../utils/asyncHandler')
+
+function createRoomsRouter({ database, io }) {
+  const router = express.Router()
+
+  router.post(
+    '/:room/join',
+    asyncHandler(async (req, res) => {
+      const { room } = req.params
+      const { username, userId } = req.body
+
+      if (!username || !username.trim()) {
+        return res.status(400).json({ error: 'Username is required' })
+      }
+
+      const id = userId || randomUUID()
+      const user = await database.upsertUser({
+        id,
+        username: username.trim(),
+        room,
+      })
+
+      await broadcastParticipants(database, io, room)
+      res.json({ user })
+    }),
+  )
+
+  router.patch(
+    '/:room/users/:userId',
+    asyncHandler(async (req, res) => {
+      const { room, userId } = req.params
+      const { username } = req.body
+
+      if (!username || !username.trim()) {
+        return res.status(400).json({ error: 'Username is required' })
+      }
+
+      const user = await database.getUser(userId)
+      if (!user || user.room !== room) {
+        return res.status(404).json({ error: 'User not found in this room' })
+      }
+
+      const updated = await database.updateUsername(userId, username.trim())
+      await broadcastParticipants(database, io, room)
+      res.json({ user: updated })
+    }),
+  )
+
+  router.post(
+    '/:room/leave',
+    asyncHandler(async (req, res) => {
+      const { room } = req.params
+      const { userId } = req.body
+
+      if (!userId) {
+        return res.status(400).json({ error: 'userId is required' })
+      }
+
+      const user = await database.getUser(userId)
+      if (!user || user.room !== room) {
+        return res.status(404).json({ error: 'User not found in this room' })
+      }
+
+      await database.setUserOffline(userId)
+      await broadcastParticipants(database, io, room)
+      res.json({ success: true })
+    }),
+  )
+
+  router.get(
+    '/:room/messages',
+    asyncHandler(async (req, res) => {
+      const { room } = req.params
+      const messages = await database.getMessages(room)
+      res.json({ messages })
+    }),
+  )
+
+  router.get(
+    '/:room/participants',
+    asyncHandler(async (req, res) => {
+      const { room } = req.params
+      const participants = await database.getParticipants(room)
+      res.json({ participants })
+    }),
+  )
+
+  router.post(
+    '/:room/messages',
+    asyncHandler(async (req, res) => {
+      const { room } = req.params
+      const { userId, text } = req.body
+
+      if (!userId || !text || !text.trim()) {
+        return res.status(400).json({ error: 'userId and text are required' })
+      }
+
+      const user = await database.getUser(userId)
+      if (!user || user.room !== room) {
+        return res.status(404).json({ error: 'Unknown user or room mismatch' })
+      }
+
+      const message = await database.addMessage({
+        id: randomUUID(),
+        room,
+        userId,
+        username: user.username,
+        text: text.trim(),
+      })
+
+      io.to(room).emit('message:new', message)
+      res.status(201).json({ message })
+    }),
+  )
+
+  return router
+}
+
+async function broadcastParticipants(database, io, room) {
+  const participants = await database.getParticipants(room)
+  io.to(room).emit('participants:update', participants)
+}
+
+module.exports = createRoomsRouter