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Watch party: guests stream instead of waiting on a device copy, one load per song, host seat and guest seats can't be taken over, host reload restores the song, real taps only detach, reconnect after background, keep invite code and chat draft

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Jonathan Sykes
2026-10-15 19:12:10 +08:00
parent 63cea89b68
commit 32d1f6891b
5 changed files with 127 additions and 23 deletions
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26
server/party.js
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@@ -26,6 +26,7 @@ const ALPHABET = 'ABCDEFGHJKLMNPQRSTUVWXYZ23456789'; // no 0/O, 1/I
const PARTY_GRACE_MS = 5 * 60_000;
const CHAT_KEEP = 60;
const MAX_MSG = 64 * 1024;
const MSG_BURST = 40, MSG_PER_SEC = 20; // per member: everything except chat, which has its own guard
export const PARTY_COMMANDS = new Set(['toggle', 'play', 'pause', 'seek', 'next', 'prev']);
const clean = (v, max, fallback = '') =>
@@ -73,22 +74,24 @@ export function createPartyHub({ now = () => Date.now() } = {}) {
if (!parties.has(code)) {
fails.push(t); joinFails.set(ip, fails);
if (joinFails.size > 5000) joinFails.clear();
return new Response('no such party', { status: 404 });
}
} else if (role !== 'host') {
return new Response('unknown role', { status: 400 });
}
const ok = server.upgrade(req, { data: { hub: 'party', role, pid, name, code, secret: q('secret') } });
// Unknown codes still upgrade so open() can answer with close code 4004 —
// a plain HTTP 404 made the client retry forever.
const ok = server.upgrade(req, { data: { hub: 'party', role, pid, name, code, secret: q('secret'), key: q('key').slice(0, 64), ip } });
return ok ? undefined : new Response('upgrade failed', { status: 400 });
}
function open(ws) {
const d = ws.data;
let p;
let p, lost = false;
if (d.role === 'host') {
p = d.code && parties.get(d.code);
if (p && !same(p.secret, d.secret)) { ws.close(4003, 'not the host of this party'); return; }
if (!p) {
lost = !!d.code; // resuming a room the server no longer has (restart / expiry)
const code = newCode();
p = { direct: createDirectRelay(), code, secret: randomBytes(18).toString('base64url'), hostPid: d.pid, members: new Map(), state: null, chat: [], dj: createDJQueue(), allowControl: false, hostOnline: true, hostLeftAt: 0 };
parties.set(code, p);
@@ -99,12 +102,16 @@ export function createPartyHub({ now = () => Date.now() } = {}) {
} else {
p = parties.get(d.code);
if (!p) { ws.close(4004, 'no such party'); return; }
// Participant ids are public (members list); a guest may not claim the host's.
if (d.pid === p.hostPid) { ws.close(4003, 'not the host of this party'); return; }
}
const prev = p.members.get(d.pid);
// Only the same device (same private key) may take over a participant's seat.
if (prev && prev.ws !== ws && prev.key && d.role !== 'host' && !same(prev.key, d.key || '')) { ws.close(4005, 'participant id in use'); return; }
if (prev && prev.ws !== ws) { try { prev.ws.close(4000, 'replaced'); } catch { /* gone */ } }
p.members.set(d.pid, { ws, pid: d.pid, name: d.name, voice: false, lastChat: 0 });
p.members.set(d.pid, { ws, pid: d.pid, name: d.name, voice: false, lastChat: 0, key: d.key || '', host: d.role === 'host', tokens: MSG_BURST, refill: now() });
send(ws, {
type: 'hello', code: p.code, secret: d.role === 'host' ? p.secret : undefined, you: d.pid,
type: 'hello', code: p.code, secret: d.role === 'host' ? p.secret : undefined, you: d.pid, lost,
now: now(), members: members(p), state: p.state, chat: p.chat, dj: queueSnapshot(p.dj), allowControl: p.allowControl,
});
broadcast(p, { type: 'members', members: members(p), joined: d.name }, ws);
@@ -118,7 +125,13 @@ export function createPartyHub({ now = () => Date.now() } = {}) {
const p = parties.get(d.code);
const me = p && p.members.get(d.pid);
if (!me || me.ws !== ws || !m || typeof m !== 'object') return;
const isHost = d.pid === p.hostPid;
const isHost = me.host && d.pid === p.hostPid;
if (m.type !== 'chat') {
const t = now();
me.tokens = Math.min(MSG_BURST, me.tokens + ((t - me.refill) / 1000) * MSG_PER_SEC); me.refill = t;
if (me.tokens < 1) return; // flood: drop
me.tokens -= 1;
}
if (m.type === 'direct') {
p.direct.handle(me.pid, m, new Map([...p.members].map(([pid, member]) => [pid, member.ws])), send);
} else if (m.type === 'dj') {
@@ -141,6 +154,7 @@ export function createPartyHub({ now = () => Date.now() } = {}) {
if (p.chat.length > CHAT_KEEP) p.chat.shift();
broadcast(p, { type: 'chat', msg });
} else if (m.type === 'voice') {
if (me.voice === !!m.on) return;
me.voice = !!m.on;
broadcast(p, { type: 'members', members: members(p) });
} else if (m.type === 'rtc' && typeof m.to === 'string') {