refactor(gateway): completely refactor gateway
This commit is contained in:
hippoz
parent
fe124316a4
commit
3cd7fcb5f9
GPG key ID:
7C52899193467641
2 changed files with 210 additions and 238 deletions
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@ -1,7 +1,5 @@
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const websockets = require("ws");
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const websockets = require("ws");
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const EventEmitter = require("events");
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const uuid = require("uuid");
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const uuid = require("uuid");
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const werift = require("werift");
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const { policies, gatewayPingInterval, gatewayPingCheckInterval, clientFacingPingInterval } = require("../../../config");
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const { policies, gatewayPingInterval, gatewayPingCheckInterval, clientFacingPingInterval } = require("../../../config");
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const { experiments } = require("../../../experiments");
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const { experiments } = require("../../../experiments");
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@ -20,276 +18,249 @@ const wsCloseCodes = {
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FLOODING: [4007, "Flooding"],
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FLOODING: [4007, "Flooding"],
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NO_PING: [4008, "No ping"],
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NO_PING: [4008, "No ping"],
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};
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};
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const closeConnectionWithCode = (ws, code) => ws.close(code[0], code[1]);
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class GatewayRTCConnection {
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class GatewaySession {
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constructor(ws, server) {
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constructor() {
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this.authenticated = false;
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this.user = null;
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this.token = null;
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this.sessionId = uuid.v4();
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// Specific to websocket sessions
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this.isWebsocketConnection = false;
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this.ws = null;
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this.lastPing = new Date();
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this.channels = [];
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}
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setWebsocketClient(ws) {
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this.ws = ws;
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this.ws = ws;
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this.server = server;
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this.isWebsocketConnection = true;
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this.connection = new werift.RTCPeerConnection();
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this.connection.onnegotiationneeded.subscribe(() => this.renegotiate); // TODO: what
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}
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}
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async answer(offer) {
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async authenticateWithToken(token) {
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await this.connection.setRemoteDescription(offer);
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let user = null;
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await this.connection.setLocalDescription(await this.connection.createAnswer());
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try {
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return this.connection.localDescription;
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user = await checkToken(token);
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if (!user) return false;
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this.token = token;
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this.user = user;
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this.authenticated = true;
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return true;
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} catch(e) {
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return false;
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}
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}
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}
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async addTrack(track) {
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send(name, data) {
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if (!track) return;
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this.ws.send(packet(name, data));
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this.ws.send(this.server.packet("EVENT_TRACK_NOTIFICATION", {
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kind: track.kind
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}));
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this.connection.addTransceiver(track);
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}
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}
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async renegotiate() {
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isReady() {
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this.ws.send(this.server.packet("EVENT_RENEGOTIATE_REQUIRED", {}));
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return this.authenticated && this.ws;
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}
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}
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}
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}
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class GatewayServer extends EventEmitter {
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class GatewayHandler {
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constructor({ server }) {
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constructor() {
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super();
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this.wss = new websockets.Server({ server: server, path: "/gateway" });
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this.sessionCounters = {};
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this.sessionCounters = {};
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}
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// server event handlers
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handleServerConfigRequest() {
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return {
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path: "/gateway"
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};
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}
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handleServerReady(wss) {
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this.wss = wss;
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this.pingCheckIntervalFunction = setInterval(() => {
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this.pingCheckIntervalFunction = setInterval(() => {
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this.wss.clients.forEach((client) => {
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this.wss.clients.forEach((client) => {
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if ((new Date() - client.session.lastPing) >= gatewayPingInterval) {
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if ((new Date() - client.session.lastPing) >= gatewayPingInterval) {
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closeConnectionWithCode(client, wsCloseCodes.NO_PING);
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client.close(wsCloseCodes.NO_PING[0], wsCloseCodes.NO_PING[1]);
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}
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}
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});
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});
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}, gatewayPingCheckInterval);
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}, gatewayPingCheckInterval);
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}
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this.wss.on("close", () => {
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handleServerClose() {
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clearInterval(this.pingCheckIntervalFunction);
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clearInterval(this.pingCheckIntervalFunction);
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console.log("gateway: websocket server closed");
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}
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});
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this.wss.on("connection", (ws) => {
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handleConnection(ws) {
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if (!policies.allowGatewayConnection) return closeConnectionWithCode(ws, wsCloseCodes.SERVER_DENIED_CONNECTION);
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const session = new GatewaySession();
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ws.send(packet("HELLO", { pingInterval: clientFacingPingInterval }));
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session.setWebsocketClient(ws);
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ws.session = {
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session.send("HELLO", { pingInterval: clientFacingPingInterval });
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authenticated: false,
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return session;
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user: null,
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}
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sessionId: uuid.v4(),
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lastPing: new Date(),
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token: null
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};
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ws.on("close", async () => {
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handleConnectionClose(ws) {
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if (ws.session.user && ws.channels) {
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if (ws.session && ws.session.user && ws.session.channels) {
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if (this.sessionCounters[ws.session.user._id] <= 1) {
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if (this.sessionCounters[ws.session.user._id] <= 1) {
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this.inChannel(ws.channels[0], (client) => {
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this.eachInChannel(ws.session.channels[0], (client) => {
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console.log(client.session);
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if (client.session && client.session.isReady()) {
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client.send(packet("EVENT_CHANNEL_MEMBERS", {
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client.session.send("EVENT_CHANNEL_MEMBERS", {
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[ws.session.user._id]: {
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[ws.session.user._id]: {
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_id: ws.session.user._id,
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_id: ws.session.user._id,
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username: ws.session.user.username,
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username: ws.session.user.username,
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status: 0,
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status: 0,
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status_text: ""
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status_text: ""
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}
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}
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}));
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});
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});
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}
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}
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this.sessionCounters[ws.session.user._id]--;
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});
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}
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}
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this.sessionCounters[ws.session.user._id]--;
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if (this.sessionCounters[ws.session.user._id] <= 0) {
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this.sessionCounters[ws.session.user._id] = null;
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delete this.sessionCounters[ws.session.user._id];
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}
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}
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}
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if (ws.rtc && ws.rtc.connection) await ws.rtc.connection.close();
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handleMessage(senderSession, packet) {
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return this[`handle_${packet.opcodeType}`](packet, senderSession);
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}
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// utility functions
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addSessionCounter(id) {
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if (!this.sessionCounters[id]) this.sessionCounters[id] = 0;
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this.sessionCounters[id]++;
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if (this.sessionCounters[id] > policies.perUserMaxGatewayConnections) return false;
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return true;
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}
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getClients() {
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return this.wss.clients;
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}
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eachInChannel(channelId, callback) {
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const clients = this.getClients();
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clients.forEach((client) => {
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if (client.session && client.session.isReady() && client.session.channels.includes(channelId))
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callback(client);
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});
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}
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// Gateway message handlers
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async handle_YOO({ data }, session) {
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if (session.authenticated) return {error: wsCloseCodes.PAYLOAD_ERROR};
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try {
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if (!(await session.authenticateWithToken(data.token))) return {error: wsCloseCodes.AUTHENTICATION_ERROR};
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} catch(e) {
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return {error: wsCloseCodes.AUTHENTICATION_ERROR};
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}
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if (!this.addSessionCounter(session.user._id)) return {error: wsCloseCodes.TOO_MANY_SESSIONS};
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const channels = (await Channel.find().lean().sort({ _id: -1 }).limit(50).select("-posts -__v").populate("creator", User.getPulicFields(true))) || [];
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session.channels = channels.map(x => x._id.toString());
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session.send("YOO_ACK", { session_id: session.sessionId, channels, user: { username: session.user.username, _id: session.user._id }, __global_experiments: experiments });
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const channel = session.channels[0];
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if (channel) {
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const presence = {};
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this.eachInChannel(channel, ({ session: remoteSession }) => {
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presence[remoteSession.user._id] = {
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_id: remoteSession.user._id,
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username: remoteSession.user.username,
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status: 1,
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status_text: "Online"
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};
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if (remoteSession.sessionId !== session.sessionId) {
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remoteSession.send("EVENT_CHANNEL_MEMBERS", {
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[session.user._id]: {
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_id: session.user._id,
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username: session.user.username,
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status: 1,
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status_text: "Online"
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}
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});
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}
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});
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});
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ws.on("message", async (data, isBinary) => {
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try {
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if (isBinary) return closeConnectionWithCode(ws, wsCloseCodes.PAYLOAD_ERROR);
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const message = parseMessage(data.toString());
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switch (message.opcodeType) {
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case "YOO": {
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if (ws.session.authenticated) return closeConnectionWithCode(ws, wsCloseCodes.PAYLOAD_ERROR);
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// The client has responded to our HELLO with a YOO packet
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try {
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const user = await checkToken(message.data.token);
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if (!user) return closeConnectionWithCode(ws, wsCloseCodes.AUTHENTICATION_ERROR);
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ws.session.user = user;
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ws.session.authenticated = true;
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ws.session.token = message.data.token;
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if (!this.sessionCounters[user._id]) this.sessionCounters[user._id] = 0;
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session.send("EVENT_CHANNEL_MEMBERS", presence);
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this.sessionCounters[user._id]++;
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}
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if (this.sessionCounters[user._id] > policies.perUserMaxGatewayConnections) return closeConnectionWithCode(ws, wsCloseCodes.TOO_MANY_SESSIONS);
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}
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// The user is now successfully authenticated, send the YOO_ACK packet
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async handle_ACTION_PING({ data }, session) {
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// TODO: This is probably not efficient
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if (!session.isReady()) return {error: wsCloseCodes.NOT_AUTHENTICATED};
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if (data !== "1") throw new Error("msg: ACTION_PING payload data should be a `1`");
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let channels = await Channel.find().lean().sort({ _id: -1 }).limit(50).select("-posts -__v").populate("creator", User.getPulicFields(true));
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const user = await checkToken(session.token);
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if (!channels) channels = [];
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if (!user) return {error: wsCloseCodes.AUTHENTICATION_ERROR};
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channels = channels.map(x => ({ ...x, _id: x._id.toString() }));
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session.lastPing = new Date();
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}
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ws.channels = channels.map(x => x._id);
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async handle_ACTION_CREATE_MESSAGE({ data }, session) {
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if (!session.isReady()) return {error: wsCloseCodes.NOT_AUTHENTICATED};
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if (typeof data.content !== "string" || typeof data.channel !== "object" || typeof data.channel._id !== "string") throw new Error("msg: invalid fields in json payload");
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ws.send(packet("YOO_ACK", { session_id: ws.session.sessionId, channels, user: { username: user.username, _id: user._id }, __global_experiments: experiments }));
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const messageContent = data.content.trim();
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if (messageContent.length > 2000 || messageContent === "") return;
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if (data.channel._id.length !== 24) throw new Error("msg: payload has invalid id"); // MONGODB ONLY!!
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let presence = {};
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// Check if the user is in that channel before broadcasting the message
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const channel = channels[0];
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if (!session.channels.includes(data.channel._id)) return {error: wsCloseCodes.NOT_AUTHORIZED};
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if (channel) {
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this.eachInChannel(data.channel._id, ({ session: remoteSession }) => {
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this.inChannel(channel._id, (client) => {
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remoteSession.send("EVENT_CREATE_MESSAGE", {
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presence[client.session.user._id] = {
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content: messageContent,
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_id: client.session.user._id,
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channel: {
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username: client.session.user.username,
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_id: data.channel._id
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status: 1,
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},
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status_text: "Online"
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author: {
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};
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_id: session.user._id,
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if (client.session.sessionId !== ws.session.sessionId) client.send(packet("EVENT_CHANNEL_MEMBERS", {
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username: session.user.username
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[ws.session.user._id]: {
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},
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_id: ws.session.user._id,
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_id: uuid.v4()
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username: ws.session.user.username,
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status: 1,
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status_text: "Online"
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}
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}));
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});
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ws.send(packet("EVENT_CHANNEL_MEMBERS", presence));
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}
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console.log(`gateway: user ${user.username}: handshake complete`);
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} catch (e) {
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console.log("gateway:", e);
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return closeConnectionWithCode(ws, wsCloseCodes.AUTHENTICATION_ERROR);
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}
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break;
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}
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case "ACTION_PING": {
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if (!this.authMessage(ws)) return;
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if (message.data !== "1") throw new Error("msg: ACTION_PING payload data should be a `1`");
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const user = await checkToken(ws.session.token);
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if (!user) return closeConnectionWithCode(ws, wsCloseCodes.AUTHENTICATION_ERROR);
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ws.session.lastPing = new Date();
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break;
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}
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case "ACTION_CREATE_MESSAGE": {
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if (!this.authMessage(ws)) return;
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if (typeof message.data.content !== "string" || typeof message.data.channel !== "object" || typeof message.data.channel._id !== "string") throw new Error("msg: invalid fields in json payload");
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const messageContent = message.data.content.trim();
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if (messageContent.length > 2000) return;
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if (messageContent === "") return;
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if (message.data.channel._id.length !== 24) throw new Error("msg: payload has invalid id"); // MONGODB ONLY!!
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// Check if the user is in that channel before broadcasting the message
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if (!ws.channels.includes(message.data.channel._id)) return closeConnectionWithCode(ws, wsCloseCodes.NOT_AUTHORIZED);
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this.broadcast(message.data.channel._id, packet("EVENT_CREATE_MESSAGE", {
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content: messageContent,
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channel: {
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_id: message.data.channel._id
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},
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author: {
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_id: ws.session.user._id,
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username: ws.session.user.username
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},
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_id: uuid.v4()
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}));
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break;
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}
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case "ACTION_VOICE_REQUEST_SESSION": {
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if (!experiments.voiceSFUTesting) return;
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// just send ourselves as the voice server lol
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ws.send(packet("EVENT_VOICE_ASSIGN_SERVER", {
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reportTo: "/gateway",
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channel: message.data.channel
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}));
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break;
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}
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case "ACTION_VOICE_CONNECTION_REQUEST": {
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if (!this.authMessage(ws)) return;
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if (!experiments.voiceSFUTesting) return;
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const offer = message.data.offer;
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const channel = message.data.channel;
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if (!channel || !channel._id) throw new Error("Client did not send a valid channel in ACTION_VOICE_CONNECTION_REQUEST");
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if (!offer) throw new Error("Client did not send any offer in ACTION_VOICE_CONNECTION_REQUEST");
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let isNewConnection = true;
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if (ws.rtc) {
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isNewConnection = false;
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} else {
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ws.rtc = new GatewayRTCConnection(ws, this);
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}
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if (isNewConnection) {
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ws.rtc.connection.onTransceiver.subscribe(async (transceiver) => {
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const [track] = await transceiver.onTrack.asPromise();
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this.inChannel(channel._id, (otherWs) => {
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if (!this.clientRTCReady(otherWs)) return;
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if (otherWs.session.sessionId === ws.session.sessionId) return; // Don't perform the actions below on ourselves
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otherWs.rtc.addTrack(track);
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otherWs.rtc.renegotiate();
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});
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});
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}
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||||||
|
|
||||||
ws.send(packet("EVENT_VOICE_CONNECTION_ANSWER", {
|
|
||||||
answer: await ws.rtc.answer(offer)
|
|
||||||
}));
|
|
||||||
|
|
||||||
if (isNewConnection) {
|
|
||||||
this.inChannel(channel._id, (otherWs) => {
|
|
||||||
if (!this.clientRTCReady(otherWs)) return;
|
|
||||||
if (otherWs.session.sessionId === ws.session.sessionId) return; // Don't perform the actions below on ourselves
|
|
||||||
|
|
||||||
const otherReceivers = otherWs.rtc.connection.getReceivers();
|
|
||||||
for (let i = 0; i < otherReceivers.length; i++) {
|
|
||||||
const otherRecevier = otherReceivers[i];
|
|
||||||
ws.rtc.addTrack(otherRecevier.tracks[0]);
|
|
||||||
}
|
|
||||||
});
|
|
||||||
ws.rtc.renegotiate();
|
|
||||||
}
|
|
||||||
break;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
} catch(e) {
|
|
||||||
console.error("gateway:", e);
|
|
||||||
return closeConnectionWithCode(ws, wsCloseCodes.PAYLOAD_ERROR);
|
|
||||||
}
|
|
||||||
});
|
});
|
||||||
});
|
});
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|
||||||
GatewayServer.prototype.broadcast = function(channelId, data) {
|
class GatewayServer {
|
||||||
this.wss.clients.forEach((client) => {
|
constructor(httpServer) {
|
||||||
if (this.clientReady(client) && client.channels.includes(channelId)) client.send(data);
|
this.httpServer = httpServer;
|
||||||
});
|
this.wss = null;
|
||||||
};
|
this.handler = null;
|
||||||
|
|
||||||
GatewayServer.prototype.inChannel = function(channelId, func) {
|
|
||||||
this.wss.clients.forEach((client) => {
|
|
||||||
if (this.clientReady(client) && client.channels.includes(channelId)) func(client);
|
|
||||||
});
|
|
||||||
};
|
|
||||||
|
|
||||||
GatewayServer.prototype.clientReady = function(ws) {
|
|
||||||
return ws.readyState === websockets.OPEN && ws.session && ws.session.authenticated;
|
|
||||||
};
|
|
||||||
|
|
||||||
GatewayServer.prototype.clientRTCReady = function(ws) {
|
|
||||||
return ws.rtc; // TODO: add more checks
|
|
||||||
};
|
|
||||||
|
|
||||||
GatewayServer.prototype.authMessage = function(ws) {
|
|
||||||
if (!this.clientReady(ws)) {
|
|
||||||
closeConnectionWithCode(ws, wsCloseCodes.NOT_AUTHENTICATED);
|
|
||||||
return false;
|
|
||||||
}
|
}
|
||||||
return true;
|
|
||||||
};
|
|
||||||
|
|
||||||
module.exports = GatewayServer;
|
bindHandler(handler) {
|
||||||
|
if (this.wss) throw new Error("GatewayServer: cannot bindHandler() to a server which already has a bound handler.");
|
||||||
|
|
||||||
|
const newHandler = new handler();
|
||||||
|
this.handler = newHandler;
|
||||||
|
this.wss = new websockets.Server({ server: this.httpServer, ...(this.handler.handleServerConfigRequest()) });
|
||||||
|
this.handler.handleServerReady(this.wss);
|
||||||
|
this.wss.on("close", () => this.handler.handleServerClose());
|
||||||
|
this.wss.on("connection", (ws) => {
|
||||||
|
const session = this.handler.handleConnection(ws);
|
||||||
|
if (!session)
|
||||||
|
return ws.close();
|
||||||
|
if (session.__error)
|
||||||
|
return ws.close(session.__error[0], session.__error[1]);
|
||||||
|
ws.session = session;
|
||||||
|
ws.on("message", async (data, isBinary) => {
|
||||||
|
try {
|
||||||
|
if (isBinary || !ws.session) return ws.close(wsCloseCodes.PAYLOAD_ERROR[0], wsCloseCodes.PAYLOAD_ERROR[1]);
|
||||||
|
const status = await this.handler.handleMessage(ws.session, parseMessage(data.toString()));
|
||||||
|
if (status && status.error) {
|
||||||
|
return ws.close(status.error[0], status.error[1]);
|
||||||
|
}
|
||||||
|
} catch(e) {
|
||||||
|
console.error("GatewayServer: unexpected error while attempting to handle payload", e);
|
||||||
|
ws.close(wsCloseCodes.PAYLOAD_ERROR[0], wsCloseCodes.PAYLOAD_ERROR[1]);
|
||||||
|
}
|
||||||
|
});
|
||||||
|
ws.on("close", (code, reason) => {
|
||||||
|
this.handler.handleConnectionClose(ws, code, reason);
|
||||||
|
});
|
||||||
|
});
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
module.exports = { GatewayServer, GatewayHandler };
|
||||||
|
|
|
||||||
|
|
@ -1,6 +1,6 @@
|
||||||
const config = require("./config");
|
const config = require("./config");
|
||||||
const apiRoute = require("./api/v1");
|
const apiRoute = require("./api/v1");
|
||||||
const GatewayServerV2 = require("./api/v2/gateway/index");
|
const { GatewayServer, GatewayHandler } = require("./api/v2/gateway/index");
|
||||||
|
|
||||||
const express = require("express");
|
const express = require("express");
|
||||||
const cookieParser = require("cookie-parser");
|
const cookieParser = require("cookie-parser");
|
||||||
|
|
@ -10,7 +10,8 @@ const http = require("http");
|
||||||
const app = express();
|
const app = express();
|
||||||
const httpServer = http.createServer(app);
|
const httpServer = http.createServer(app);
|
||||||
|
|
||||||
new GatewayServerV2({ server: httpServer });
|
const gatewayServer = new GatewayServer(httpServer);
|
||||||
|
gatewayServer.bindHandler(GatewayHandler);
|
||||||
|
|
||||||
app.use(express.urlencoded({ extended: false }));
|
app.use(express.urlencoded({ extended: false }));
|
||||||
app.use(express.json());
|
app.use(express.json());
|
||||||
|
|
|
||||||
Reference in a new issue