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feat(co-host): client gates use controller-set membership (background + content)

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- background: track controllers[] from ROOM_DATA/CONTROL_MODE (restore + reset on
  teardown); add amController() (owner or co-host). Both gates now key on controller
  membership (sender: !amController(); receiver: senderId not in controllers); desync
  invariant uses amController. Thread controllers/amController/coHostSupported through
  GET_STATUS/GET_CONTROL_MODE/CONTROL_MODE. New SET_PEER_ROLE message (owner→server).
- content: gate on amController instead of amHost (a controller is not a gated guest);
  reconcile/HOST_BLOCKED updated accordingly. Drop now-unused hcmAmHost.

Single-host behavior unchanged (owner is always the sole controller until they promote).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
KoalaDev
2026-06-28 03:41:23 +02:00
parent a326087ca5
commit 7c65fe80cb
2 changed files with 50 additions and 23 deletions
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extension/background.js
+42 -15
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@@ -82,7 +82,10 @@ function serverSupports(cap) { return Array.isArray(serverCapabilities) && serve
// in heartbeats so the host's popup UI can show "Solo" instead of silently
// appearing un-ACK'd.
let hcmDesynced = false;
function amHost() { return !!peerId && hostPeerId === peerId; }
// Co-Host: peerIds allowed to drive in host-only (always includes the owner).
let controllers = [];
function amHost() { return !!peerId && hostPeerId === peerId; } // owner: can toggle mode / promote
function amController() { return amHost() || (!!peerId && controllers.includes(peerId)); } // can drive the room
// Room-moving actions a guest may not initiate while in host-only mode.
const HOST_ONLY_GATED_ACTIONS = [
EVENTS.PLAY, EVENTS.PAUSE, EVENTS.SEEK,
@@ -160,6 +163,7 @@ function ensureState() {
// Host Control Mode: restore role/mode/capabilities from persisted room.
controlMode = currentRoom.controlMode || CONTROL_MODES.EVERYONE;
hostPeerId = currentRoom.hostPeerId || null;
controllers = Array.isArray(currentRoom.controllers) ? currentRoom.controllers : [];
serverCapabilities = Array.isArray(currentRoom.capabilities) ? currentRoom.capabilities : [];
}
if (data.hcmDesynced !== undefined) hcmDesynced = data.hcmDesynced;
@@ -477,6 +481,7 @@ async function leaveRoomAfterIdleGrace(reason) {
currentRoom = null;
controlMode = CONTROL_MODES.EVERYONE;
hostPeerId = null;
controllers = [];
serverCapabilities = [];
hcmDesynced = false;
// Notify content.js/popup BEFORE currentTabId is cleared so they can reset
@@ -692,7 +697,7 @@ async function connect() {
// mislabel us as "Solo" to peers and (in content) keep us ignoring host commands
// after the reason to is gone. Call after any controlMode/hostPeerId change.
function hcmEnforceDesyncInvariant() {
if (hcmDesynced && !(controlMode === CONTROL_MODES.HOST_ONLY && !amHost())) {
if (hcmDesynced && !(controlMode === CONTROL_MODES.HOST_ONLY && !amController())) {
hcmDesynced = false;
if (storageInitialized) chrome.storage.session.set({ hcmDesynced: false });
}
@@ -701,7 +706,7 @@ function hcmEnforceDesyncInvariant() {
function broadcastControlMode() {
// Notify popup (role badge / host toggle) and the active content tab
// (so it can enable/disable the host-only guest gate).
const payload = { type: 'CONTROL_MODE', controlMode, hostPeerId, amHost: amHost(), hostControlSupported: serverSupports(CAPABILITIES.HOST_CONTROL) };
const payload = { type: 'CONTROL_MODE', controlMode, hostPeerId, controllers, amHost: amHost(), amController: amController(), hostControlSupported: serverSupports(CAPABILITIES.HOST_CONTROL), coHostSupported: serverSupports(CAPABILITIES.CO_HOST) };
chrome.runtime.sendMessage(payload).catch(() => {});
if (currentTabId) {
const tabId = parseInt(currentTabId);
@@ -943,16 +948,16 @@ function handleServerEvent(event, data) {
return;
}
// Host Control Mode (receiver-side backstop): in host-only mode, ignore
// room-moving events from any non-host peer. The server already drops these,
// room-moving events from any non-controller. The server already drops these,
// so this covers old/buggy/modified clients that slipped through.
// Defensive: require a known hostPeerId — if the server ever sends host-only
// without a host (state inconsistency), gate-everyone would lock the host
// without a host (state inconsistency), gate-everyone would lock the owner
// out of their own room (L-6).
if (controlMode === CONTROL_MODES.HOST_ONLY &&
hostPeerId &&
HOST_ONLY_GATED_ACTIONS.includes(event) &&
data.senderId && data.senderId !== hostPeerId) {
addLog(`Ignored ${event} from non-host ${data.senderId} (host-only)`, 'warn');
data.senderId && data.senderId !== hostPeerId && !controllers.includes(data.senderId)) {
addLog(`Ignored ${event} from non-controller ${data.senderId} (host-only)`, 'warn');
return;
}
switch (event) {
@@ -961,6 +966,7 @@ function handleServerEvent(event, data) {
// Host Control Mode: adopt room role/mode on (re)join.
controlMode = data.controlMode || CONTROL_MODES.EVERYONE;
hostPeerId = data.hostPeerId || null;
controllers = Array.isArray(data.controllers) ? data.controllers : [];
serverCapabilities = Array.isArray(data.capabilities) ? data.capabilities : [];
hcmEnforceDesyncInvariant();
broadcastControlMode();
@@ -1025,13 +1031,15 @@ function handleServerEvent(event, data) {
// Host Control Mode changed (toggle or host-leave fallback).
controlMode = data.controlMode || CONTROL_MODES.EVERYONE;
hostPeerId = data.hostPeerId || null;
controllers = Array.isArray(data.controllers) ? data.controllers : [];
hcmEnforceDesyncInvariant();
if (currentRoom) {
currentRoom.controlMode = controlMode;
currentRoom.hostPeerId = hostPeerId;
currentRoom.controllers = controllers;
if (storageInitialized) chrome.storage.session.set({ currentRoom });
}
addLog(`Control mode: ${controlMode}${amHost() ? ' (you are host)' : ''}`, 'info');
addLog(`Control mode: ${controlMode}${amHost() ? ' (you are owner)' : (amController() ? ' (you are controller)' : '')}`, 'info');
broadcastControlMode();
break;
case EVENTS.ROOM_LIST:
@@ -1596,6 +1604,7 @@ function leaveOldRoomIfSwitching(newRoomId) {
currentRoom = null;
controlMode = CONTROL_MODES.EVERYONE;
hostPeerId = null;
controllers = [];
serverCapabilities = [];
hcmDesynced = false;
// Notify content.js/popup so they drop any guest-side HCM state from the
@@ -1715,8 +1724,11 @@ async function handleAsyncMessage(message, sender, sendResponse) {
ping: currentPingMs,
controlMode,
hostPeerId,
controllers,
amHost: amHost(),
hostControlSupported: serverSupports(CAPABILITIES.HOST_CONTROL)
amController: amController(),
hostControlSupported: serverSupports(CAPABILITIES.HOST_CONTROL),
coHostSupported: serverSupports(CAPABILITIES.CO_HOST)
});
} else if (message.type === 'SET_CONTROL_MODE') {
// Popup (host) toggles the room control mode. Server validates host authority
@@ -1732,12 +1744,26 @@ async function handleAsyncMessage(message, sender, sendResponse) {
}
emit(EVENTS.SET_CONTROL_MODE, { controlMode: mode });
sendResponse({ status: 'ok' });
} else if (message.type === 'SET_PEER_ROLE') {
// Popup (owner) promotes/demotes a peer to/from controller. Server validates
// owner authority and broadcasts CONTROL_MODE back, refreshing all clients.
const targetPeerId = typeof message.peerId === 'string' ? message.peerId : null;
if (!targetPeerId) {
sendResponse({ status: 'invalid' });
return;
}
if (!amHost()) {
sendResponse({ status: 'not_owner' });
return;
}
emit(EVENTS.SET_PEER_ROLE, { peerId: targetPeerId, controller: message.controller === true });
sendResponse({ status: 'ok' });
} else if (message.type === 'GET_CONTROL_MODE') {
// content.js asks for current mode/role on (re)injection. Include the
// persisted desync state so a page reload re-adopts it — otherwise a fresh
// content script would start synced while background keeps relaying us as
// "Solo" to the host (stale-badge split-brain).
sendResponse({ controlMode, hostPeerId, amHost: amHost(), desynced: hcmDesynced, hostControlSupported: serverSupports(CAPABILITIES.HOST_CONTROL) });
sendResponse({ controlMode, hostPeerId, controllers, amHost: amHost(), amController: amController(), desynced: hcmDesynced, hostControlSupported: serverSupports(CAPABILITIES.HOST_CONTROL), coHostSupported: serverSupports(CAPABILITIES.CO_HOST) });
} else if (message.type === 'REQUEST_HOST_SYNC') {
// content.js resync: hand back the host's extrapolated current position.
sendResponse({ target: getHostSyncTarget() });
@@ -1782,6 +1808,7 @@ async function handleAsyncMessage(message, sender, sendResponse) {
currentRoom = null;
controlMode = CONTROL_MODES.EVERYONE;
hostPeerId = null;
controllers = [];
serverCapabilities = [];
hcmDesynced = false;
// Notify content.js/popup BEFORE currentTabId is cleared so they drop any
@@ -1908,12 +1935,12 @@ async function handleAsyncMessage(message, sender, sendResponse) {
});
} else if (message.type === 'CONTENT_EVENT') {
const processEvent = () => {
// Host Control Mode (sender-side): a guest in host-only mode must not
// drive the room. Don't broadcast; hand the action back to content.js so
// it can snap the local player back (and, in step 4, offer desync).
// Host Control Mode (sender-side): a non-controller in host-only mode must
// not drive the room. Don't broadcast; hand the action back to content.js so
// it can snap the local player back / offer desync.
// Defensive: require a known hostPeerId (L-6) — otherwise the actual
// host would gate themselves if state ever becomes inconsistent.
if (controlMode === CONTROL_MODES.HOST_ONLY && hostPeerId && !amHost() &&
// owner would gate themselves if state ever becomes inconsistent.
if (controlMode === CONTROL_MODES.HOST_ONLY && hostPeerId && !amController() &&
HOST_ONLY_GATED_ACTIONS.includes(message.action)) {
addLog(`Host-only: blocked local ${message.action} (you are a guest)`, 'warn');
if (sender.tab && sender.tab.id) {