Show users in voice channels before joining

server.js

@@ -102,6 +102,11 @@ const server = http.createServer((req, res) => {
     res.end(JSON.stringify(iceConfig()));
     return;
   }
+  if (req.url.startsWith('/api/rooms')) {
+    res.writeHead(200, { 'Content-Type': 'application/json', 'Cache-Control': 'no-cache' });
+    res.end(JSON.stringify(allRoomsSnapshot()));
+    return;
+  }
   serveStatic(req, res);
 });
 
@@ -131,6 +136,24 @@ function broadcast(room, msg, exceptId) {
   }
 }
 
+function allRoomsSnapshot() {
+  const out = {};
+  for (const [rId, r] of rooms.entries()) {
+    out[rId] = [...r.values()].map(snapshot);
+  }
+  return out;
+}
+
+function broadcastRosters() {
+  const snap = allRoomsSnapshot();
+  const data = JSON.stringify({ type: 'rosters', rooms: snap });
+  for (const client of wss.clients) {
+    if (client.readyState === 1) {
+      client.send(data);
+    }
+  }
+}
+
 wss.on('connection', (socket, req) => {
   const q = new URL(req.url, 'http://x').searchParams;
   const roomId = (q.get('room') || 'general').slice(0, 64);
@@ -146,6 +169,7 @@ wss.on('connection', (socket, req) => {
 
   send({ type: 'hello', id, room: roomId, peers: [...room.values()].filter((p) => p.id !== id).map(snapshot) });
   broadcast(room, { type: 'joined', peer: snapshot(client) }, id);
+  broadcastRosters();
   console.log(`[signaling] ${name} (${id}) joined #${roomId} — ${room.size} in room`);
 
   socket.on('message', (raw) => {
@@ -178,6 +202,7 @@ wss.on('connection', (socket, req) => {
           sharing: !!msg.state?.sharing,
         };
         broadcast(room, { type: 'state', from: id, state: client.state }, id);
+        broadcastRosters();
         break;
       }
       case 'offer':
@@ -200,6 +225,7 @@ wss.on('connection', (socket, req) => {
     room.delete(id);
     if (room.size === 0) rooms.delete(roomId);
     else broadcast(room, { type: 'left', id });
+    broadcastRosters();
     console.log(`[signaling] ${name} (${id}) left #${roomId} — ${room.size} in room`);
   });
 });
@@ -235,6 +261,6 @@ if (require.main === module) {
   startServer();
 }
 
-module.exports = { server, wss, iceConfig, interval, startServer };
+module.exports = { server, wss, iceConfig, allRoomsSnapshot, interval, startServer };