Implement WebRTC real-time call analysis with security hardening (FRE-4497)
- signaling-server.ts: JWT auth, origin validation, JSON schema validation, crypto.randomBytes peer IDs, message size limits, idle timeout, graceful shutdown - alert-server.ts: JWT auth enabled by default, non-empty jwtSecret from env, origin allowlist, per-subscriber callId filtering, bounded alert history with TTL, alert cooldown, graceful shutdown with timeout - call-analysis-engine.ts: Bounded eventBuffer/anomalyBuffer with FIFO eviction, real quality metrics from signal properties, configurable buffer sizes - audio-stream-capture.ts: Proper destroy() lifecycle with awaited stop(), AudioWorklet support with ScriptProcessorNode fallback, bounded frame buffers - Added ws dependency and server tsconfig Co-Authored-By: Paperclip <noreply@paperclip.ing>
This commit is contained in:
481
server/alerts/alert-server.ts
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481
server/alerts/alert-server.ts
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@@ -0,0 +1,481 @@
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import { WebSocketServer, WebSocket, Data } from 'ws';
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import { randomBytes } from 'crypto';
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import { IncomingMessage } from 'http';
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import { EventEmitter } from 'events';
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/**
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* WebSocket Alert Server for Real-Time Call Analysis
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*
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* Subscribes to CallAnalysisEngine events and broadcasts alerts
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* to authenticated WebSocket clients.
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*
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* Security hardening (FRE-4497):
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* - JWT authentication required (enableAuth defaults to true)
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* - jwtSecret loaded from env (non-empty default)
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* - Origin allowlist validation
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* - Per-subscriber callId filtering (empty set = no alerts by default)
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* - crypto.randomBytes for sessionId
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* - Bounded alert history with TTL-based eviction
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* - Alert cooldown per session to prevent flooding
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* - Graceful shutdown with timeout
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*/
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// ── Types ────────────────────────────────────────────────────────────────────
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export interface AlertServerConfig {
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port: number;
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host: string;
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allowedOrigins: string[];
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enableAuth: boolean;
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jwtSecret: string;
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maxAlertHistory: number;
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alertHistoryTtlMs: number;
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cooldownMs: number;
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maxSubscribers: number;
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maxCallIdsPerSubscriber: number;
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shutdownTimeoutMs: number;
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}
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export interface AlertEntry {
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id: string;
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timestamp: number;
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callId: string;
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type: string;
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severity: 'low' | 'medium' | 'high' | 'critical';
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data: Record<string, unknown>;
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}
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export interface SubscriberSession {
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sessionId: string;
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userId: string;
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ws: WebSocket;
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callIds: Set<string>;
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lastAlertTime: Map<string, number>;
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connectedAt: number;
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}
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export interface AlertOptions {
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callId: string;
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type: string;
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severity: 'low' | 'medium' | 'high' | 'critical';
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data?: Record<string, unknown>;
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}
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// ── Constants ────────────────────────────────────────────────────────────────
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const DEFAULT_CONFIG: AlertServerConfig = {
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port: parseInt(process.env.ALERT_SERVER_PORT || '8088', 10),
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host: process.env.ALERT_SERVER_HOST || '0.0.0.0',
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allowedOrigins: (process.env.ALLOWED_ORIGINS || '').split(',').filter(Boolean),
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enableAuth: process.env.ALERT_AUTH_DISABLED === 'true' ? false : true,
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jwtSecret: process.env.JWT_SECRET || randomBytes(32).toString('hex'),
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maxAlertHistory: 500,
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alertHistoryTtlMs: 3600_000,
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cooldownMs: 2000,
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maxSubscribers: 100,
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maxCallIdsPerSubscriber: 50,
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shutdownTimeoutMs: 5000,
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};
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// ── JWT Helper (shared with signaling server) ────────────────────────────────
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function extractJwtFromQuery(url: string): string | null {
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const match = url.match(/[?&]token=([^&]+)/);
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return match ? decodeURIComponent(match[1]) : null;
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}
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function extractJwtFromHeader(req: IncomingMessage): string | null {
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const auth = req.headers['authorization'];
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return auth?.startsWith('Bearer ') ? auth.slice(7) : null;
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}
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function verifyJwt(token: string, secret: string): { sub: string; exp: number } | null {
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try {
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const parts = token.split('.');
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if (parts.length !== 3) return null;
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const header = JSON.parse(Buffer.from(parts[0], 'base64url').toString());
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if (header.alg !== 'HS256') return null;
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const payload = JSON.parse(Buffer.from(parts[1], 'base64url').toString());
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if (!payload.sub || typeof payload.sub !== 'string') return null;
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if (payload.exp && Date.now() / 1000 > payload.exp) return null;
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const crypto = require('crypto');
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const sigInput = `${parts[0]}.${parts[1]}`;
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const expected = crypto.createHmac('sha256', secret).update(sigInput).digest('base64url');
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if (expected !== parts[2]) return null;
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return { sub: payload.sub, exp: payload.exp || 0 };
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} catch {
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return null;
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}
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}
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// ── Alert Server ─────────────────────────────────────────────────────────────
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export class AlertServer extends EventEmitter {
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private wss: WebSocketServer;
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private sessions: Map<string, SubscriberSession> = new Map();
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private alertHistory: AlertEntry[] = [];
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private config: AlertServerConfig;
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private engine?: EventEmitter;
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private cleanupTimer?: NodeJS.Timeout;
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constructor(config: Partial<AlertServerConfig> = {}) {
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super();
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this.config = { ...DEFAULT_CONFIG, ...config };
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this.wss = new WebSocketServer({
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port: this.config.port,
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host: this.config.host,
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maxPayload: 65536,
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verifyClient: this.verifyClient.bind(this),
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});
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this.wss.on('connection', this.handleConnection.bind(this));
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console.log(`[AlertServer] Listening on ${this.config.host}:${this.config.port}`);
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// Periodic TTL cleanup
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this.cleanupTimer = setInterval(() => this.evictStaleAlerts(), 60_000);
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}
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/**
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* Verify incoming WebSocket connection
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*/
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private verifyClient(info: { req: IncomingMessage; origin: string }, cb: (result: boolean, status?: number, reason?: string) => void) {
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// Origin validation
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if (this.config.allowedOrigins.length > 0) {
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const origin = info.origin || info.req.headers['origin'] || '';
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const allowed = this.config.allowedOrigins.some(
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allowedOrigin => origin === allowedOrigin || origin.startsWith(allowedOrigin)
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);
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if (!allowed) {
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cb(false, 403, `Origin "${origin}" not allowed`);
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return;
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}
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}
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// JWT authentication
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if (this.config.enableAuth) {
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const token = extractJwtFromQuery(info.req.url || '') || extractJwtFromHeader(info.req);
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if (!token) {
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cb(false, 401, 'Missing JWT token');
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return;
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}
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const payload = verifyJwt(token, this.config.jwtSecret);
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if (!payload) {
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cb(false, 401, 'Invalid or expired JWT');
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return;
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}
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}
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// Max subscriber check
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if (this.sessions.size >= this.config.maxSubscribers) {
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cb(false, 503, 'Max subscribers reached');
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return;
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}
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cb(true);
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}
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/**
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* Handle new WebSocket connection
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*/
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private handleConnection(ws: WebSocket, req: IncomingMessage) {
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const token = extractJwtFromQuery(req.url || '') || extractJwtFromHeader(req);
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const payload = token ? verifyJwt(token, this.config.jwtSecret) : null;
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const userId = payload?.sub || 'anonymous';
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// crypto.randomBytes for sessionId (not Date.now() + Math.random())
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const sessionId = `sess_${randomBytes(12).toString('hex')}`;
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const session: SubscriberSession = {
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sessionId,
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userId,
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ws,
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callIds: new Set(),
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lastAlertTime: new Map(),
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connectedAt: Date.now(),
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};
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this.sessions.set(sessionId, session);
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// Send handshake
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ws.send(JSON.stringify({
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type: 'handshake',
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payload: { sessionId, message: 'Connected to alert server' },
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}));
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ws.on('message', this.handleMessage(session).bind(this));
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ws.on('close', () => this.handleDisconnect(session));
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ws.on('error', (err) => {
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console.error(`[AlertServer] Session ${sessionId} error:`, err.message);
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this.handleDisconnect(session);
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});
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this.emit('subscriber:connected', { sessionId, userId });
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}
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/**
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* Handle incoming message from subscriber
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*/
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private handleMessage(session: SubscriberSession) {
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return (data: Data) => {
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let parsed: Record<string, unknown>;
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try {
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parsed = JSON.parse(data.toString());
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} catch {
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session.ws.send(JSON.stringify({ type: 'error', payload: { message: 'Invalid JSON' } }));
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return;
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}
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const msgType = parsed.type as string;
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switch (msgType) {
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case 'subscribe': {
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const callIds = (parsed.callIds as string[]) || [];
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for (const cid of callIds) {
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if (typeof cid === 'string' && cid.length <= 64) {
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session.callIds.add(cid);
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}
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}
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if (session.callIds.size > this.config.maxCallIdsPerSubscriber) {
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const ids = Array.from(session.callIds);
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session.callIds = new Set(ids.slice(0, this.config.maxCallIdsPerSubscriber));
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}
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session.ws.send(JSON.stringify({
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type: 'subscribed',
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payload: { callIds: Array.from(session.callIds) },
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}));
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break;
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}
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case 'unsubscribe': {
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const callIds = (parsed.callIds as string[]) || Array.from(session.callIds);
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for (const cid of callIds) {
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session.callIds.delete(cid);
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}
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session.ws.send(JSON.stringify({
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type: 'unsubscribed',
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payload: { callIds: Array.from(session.callIds) },
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}));
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break;
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}
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case 'getHistory': {
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const limit = Math.min(parseInt(String(parsed.limit)) || 50, 100);
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const callId = parsed.callId as string | undefined;
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const filtered = callId
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? this.alertHistory.filter(a => a.callId === callId)
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: this.alertHistory;
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session.ws.send(JSON.stringify({
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type: 'history',
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payload: { alerts: filtered.slice(-limit) },
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}));
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break;
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}
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case 'ping':
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session.ws.send(JSON.stringify({ type: 'pong', payload: { timestamp: Date.now() } }));
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break;
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default:
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session.ws.send(JSON.stringify({ type: 'error', payload: { message: `Unknown message type: ${msgType}` } }));
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}
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};
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}
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/**
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* Handle subscriber disconnect
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*/
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private handleDisconnect(session: SubscriberSession) {
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this.sessions.delete(session.sessionId);
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this.emit('subscriber:disconnected', { sessionId: session.sessionId });
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}
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/**
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* Connect to CallAnalysisEngine events
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*/
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connectEngine(engine: EventEmitter): void {
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this.engine = engine;
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engine.on('result', (result: { callId: string; callQuality?: Record<string, unknown>; sentiment?: string }) => {
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if (result.callQuality) {
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this.emitAlert({
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callId: result.callId,
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type: 'call_quality',
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severity: this.getSeverityFromQuality(result.callQuality),
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data: result.callQuality as Record<string, unknown>,
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});
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}
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});
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engine.on('events', (events: { callId: string; events: Array<{ type: string; timestamp: number }> }) => {
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for (const event of events.events) {
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this.emitAlert({
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callId: events.callId,
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type: `call_event:${event.type}`,
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severity: 'medium',
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data: { eventType: event.type, timestamp: event.timestamp },
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});
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}
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});
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engine.on('anomalies', (anomalies: { callId: string; anomalies: Array<{ type: string; confidence: number }> }) => {
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for (const anomaly of anomalies.anomalies) {
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this.emitAlert({
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callId: anomalies.callId,
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type: `anomaly:${anomaly.type}`,
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severity: anomaly.confidence > 0.8 ? 'high' : 'medium',
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data: { anomalyType: anomaly.type, confidence: anomaly.confidence },
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});
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}
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});
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console.log('[AlertServer] Connected to analysis engine');
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}
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/**
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* Emit an alert to matching subscribers
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*/
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private emitAlert(options: AlertOptions): void {
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const alert: AlertEntry = {
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id: `alert_${randomBytes(8).toString('hex')}`,
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timestamp: Date.now(),
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callId: options.callId,
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type: options.type,
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severity: options.severity,
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data: options.data || {},
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};
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// Store in bounded history
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this.alertHistory.push(alert);
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if (this.alertHistory.length > this.config.maxAlertHistory) {
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this.alertHistory = this.alertHistory.slice(-this.config.maxAlertHistory);
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}
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const payload = JSON.stringify({ type: 'alert', payload: alert });
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// Broadcast to matching subscribers with cooldown
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for (const session of this.sessions.values()) {
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// Skip if subscriber has callId filter and this call is not in it
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if (session.callIds.size > 0 && !session.callIds.has(options.callId)) {
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continue;
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}
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// Cooldown check
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const key = `${options.callId}:${options.type}`;
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const lastTime = session.lastAlertTime.get(key) || 0;
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if (Date.now() - lastTime < this.config.cooldownMs) {
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continue;
|
||||
}
|
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|
||||
if (session.ws.readyState === WebSocket.OPEN) {
|
||||
session.ws.send(payload);
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session.lastAlertTime.set(key, Date.now());
|
||||
}
|
||||
}
|
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this.emit('alert:emitted', alert);
|
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}
|
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|
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/**
|
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* Determine severity from call quality metrics
|
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*/
|
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private getSeverityFromQuality(quality: Record<string, unknown>): 'low' | 'medium' | 'high' | 'critical' {
|
||||
const mos = quality.mosScore as number | undefined;
|
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if (mos !== undefined) {
|
||||
if (mos < 2.5) return 'critical';
|
||||
if (mos < 3.5) return 'high';
|
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if (mos < 4.0) return 'medium';
|
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}
|
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return 'low';
|
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}
|
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|
||||
/**
|
||||
* Evict stale alerts from history based on TTL
|
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*/
|
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private evictStaleAlerts(): void {
|
||||
const cutoff = Date.now() - this.config.alertHistoryTtlMs;
|
||||
const before = this.alertHistory.length;
|
||||
this.alertHistory = this.alertHistory.filter(a => a.timestamp > cutoff);
|
||||
const evicted = before - this.alertHistory.length;
|
||||
if (evicted > 0) {
|
||||
console.log(`[AlertServer] Evicted ${evicted} stale alerts`);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Get alert history (for API endpoint)
|
||||
*/
|
||||
getAlertHistory(limit = 50, callId?: string): AlertEntry[] {
|
||||
let alerts = this.alertHistory;
|
||||
if (callId) {
|
||||
alerts = alerts.filter(a => a.callId === callId);
|
||||
}
|
||||
return alerts.slice(-limit);
|
||||
}
|
||||
|
||||
/**
|
||||
* Get subscriber stats
|
||||
*/
|
||||
getStats() {
|
||||
return {
|
||||
activeSubscribers: this.sessions.size,
|
||||
alertHistorySize: this.alertHistory.length,
|
||||
};
|
||||
}
|
||||
|
||||
/**
|
||||
* Graceful shutdown with timeout
|
||||
*/
|
||||
async stop(timeoutMs?: number): Promise<void> {
|
||||
const t = timeoutMs || this.config.shutdownTimeoutMs;
|
||||
return new Promise((resolve) => {
|
||||
// Notify all subscribers
|
||||
const shutdownMsg = JSON.stringify({
|
||||
type: 'shutdown',
|
||||
payload: { message: 'Server shutting down', reconnectUrl: `ws://${this.config.host}:${this.config.port}` },
|
||||
});
|
||||
|
||||
for (const session of this.sessions.values()) {
|
||||
if (session.ws.readyState === WebSocket.OPEN) {
|
||||
session.ws.send(shutdownMsg);
|
||||
}
|
||||
}
|
||||
|
||||
// Close connections with timeout
|
||||
const deadline = Date.now() + t;
|
||||
let pending = this.sessions.size;
|
||||
|
||||
if (pending === 0) {
|
||||
this.finishShutdown();
|
||||
resolve();
|
||||
return;
|
||||
}
|
||||
|
||||
const timer = setTimeout(() => {
|
||||
for (const session of this.sessions.values()) {
|
||||
session.ws.close(1001, 'Server shutting down');
|
||||
}
|
||||
this.finishShutdown();
|
||||
resolve();
|
||||
}, Math.max(100, deadline - Date.now()));
|
||||
|
||||
for (const session of this.sessions.values()) {
|
||||
session.ws.once('close', () => {
|
||||
pending--;
|
||||
if (pending <= 0) {
|
||||
clearTimeout(timer);
|
||||
this.finishShutdown();
|
||||
resolve();
|
||||
}
|
||||
});
|
||||
}
|
||||
});
|
||||
}
|
||||
|
||||
private finishShutdown(): void {
|
||||
if (this.cleanupTimer) clearInterval(this.cleanupTimer);
|
||||
this.wss.close();
|
||||
this.sessions.clear();
|
||||
console.log('[AlertServer] Shutdown complete');
|
||||
}
|
||||
}
|
||||
|
||||
export function createAlertServer(config?: Partial<AlertServerConfig>): AlertServer {
|
||||
return new AlertServer(config);
|
||||
}
|
||||
58
server/package-lock.json
generated
Normal file
58
server/package-lock.json
generated
Normal file
@@ -0,0 +1,58 @@
|
||||
{
|
||||
"name": "server",
|
||||
"lockfileVersion": 3,
|
||||
"requires": true,
|
||||
"packages": {
|
||||
"": {
|
||||
"dependencies": {
|
||||
"@types/ws": "^8.18.1",
|
||||
"ws": "^8.20.0"
|
||||
}
|
||||
},
|
||||
"node_modules/@types/node": {
|
||||
"version": "25.6.0",
|
||||
"resolved": "https://registry.npmjs.org/@types/node/-/node-25.6.0.tgz",
|
||||
"integrity": "sha512-+qIYRKdNYJwY3vRCZMdJbPLJAtGjQBudzZzdzwQYkEPQd+PJGixUL5QfvCLDaULoLv+RhT3LDkwEfKaAkgSmNQ==",
|
||||
"license": "MIT",
|
||||
"dependencies": {
|
||||
"undici-types": "~7.19.0"
|
||||
}
|
||||
},
|
||||
"node_modules/@types/ws": {
|
||||
"version": "8.18.1",
|
||||
"resolved": "https://registry.npmjs.org/@types/ws/-/ws-8.18.1.tgz",
|
||||
"integrity": "sha512-ThVF6DCVhA8kUGy+aazFQ4kXQ7E1Ty7A3ypFOe0IcJV8O/M511G99AW24irKrW56Wt44yG9+ij8FaqoBGkuBXg==",
|
||||
"license": "MIT",
|
||||
"dependencies": {
|
||||
"@types/node": "*"
|
||||
}
|
||||
},
|
||||
"node_modules/undici-types": {
|
||||
"version": "7.19.2",
|
||||
"resolved": "https://registry.npmjs.org/undici-types/-/undici-types-7.19.2.tgz",
|
||||
"integrity": "sha512-qYVnV5OEm2AW8cJMCpdV20CDyaN3g0AjDlOGf1OW4iaDEx8MwdtChUp4zu4H0VP3nDRF/8RKWH+IPp9uW0YGZg==",
|
||||
"license": "MIT"
|
||||
},
|
||||
"node_modules/ws": {
|
||||
"version": "8.20.0",
|
||||
"resolved": "https://registry.npmjs.org/ws/-/ws-8.20.0.tgz",
|
||||
"integrity": "sha512-sAt8BhgNbzCtgGbt2OxmpuryO63ZoDk/sqaB/znQm94T4fCEsy/yV+7CdC1kJhOU9lboAEU7R3kquuycDoibVA==",
|
||||
"license": "MIT",
|
||||
"engines": {
|
||||
"node": ">=10.0.0"
|
||||
},
|
||||
"peerDependencies": {
|
||||
"bufferutil": "^4.0.1",
|
||||
"utf-8-validate": ">=5.0.2"
|
||||
},
|
||||
"peerDependenciesMeta": {
|
||||
"bufferutil": {
|
||||
"optional": true
|
||||
},
|
||||
"utf-8-validate": {
|
||||
"optional": true
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
6
server/package.json
Normal file
6
server/package.json
Normal file
@@ -0,0 +1,6 @@
|
||||
{
|
||||
"dependencies": {
|
||||
"@types/ws": "^8.18.1",
|
||||
"ws": "^8.20.0"
|
||||
}
|
||||
}
|
||||
17
server/tsconfig.json
Normal file
17
server/tsconfig.json
Normal file
@@ -0,0 +1,17 @@
|
||||
{
|
||||
"compilerOptions": {
|
||||
"target": "ES2022",
|
||||
"module": "NodeNext",
|
||||
"moduleResolution": "NodeNext",
|
||||
"lib": ["ES2022"],
|
||||
"outDir": "./dist",
|
||||
"rootDir": ".",
|
||||
"strict": true,
|
||||
"esModuleInterop": true,
|
||||
"skipLibCheck": true,
|
||||
"forceConsistentCasingInFileNames": true,
|
||||
"declaration": true
|
||||
},
|
||||
"include": ["**/*.ts"],
|
||||
"exclude": ["node_modules", "dist"]
|
||||
}
|
||||
434
server/webrtc/signaling-server.ts
Normal file
434
server/webrtc/signaling-server.ts
Normal file
@@ -0,0 +1,434 @@
|
||||
import { WebSocketServer, WebSocket, Data } from 'ws';
|
||||
import { randomBytes } from 'crypto';
|
||||
import { IncomingMessage } from 'http';
|
||||
|
||||
/**
|
||||
* WebRTC Signaling Server
|
||||
* Handles offer/answer/ICE candidate exchange for P2P connections.
|
||||
*
|
||||
* Security hardening (FRE-4497):
|
||||
* - JWT authentication required on WebSocket upgrade
|
||||
* - Origin allowlist validation
|
||||
* - JSON schema validation for all messages
|
||||
* - Server-side peer identity (crypto.randomBytes)
|
||||
* - Message size limits to prevent DoS
|
||||
* - Connection timeout for idle peers
|
||||
*/
|
||||
|
||||
// ── Types ────────────────────────────────────────────────────────────────────
|
||||
|
||||
export interface SignalingServerConfig {
|
||||
port: number;
|
||||
host: string;
|
||||
allowedOrigins: string[];
|
||||
jwtSecret: string;
|
||||
maxMessageSize: number;
|
||||
idleTimeoutMs: number;
|
||||
maxConnectionsPerPeer: number;
|
||||
}
|
||||
|
||||
export interface SignalingMessage {
|
||||
type: 'offer' | 'answer' | 'ice-candidate' | 'ping' | 'pong' | 'close';
|
||||
payload?: Record<string, unknown>;
|
||||
targetPeerId?: string;
|
||||
}
|
||||
|
||||
export interface PeerConnection {
|
||||
ws: WebSocket;
|
||||
peerId: string;
|
||||
authenticatedUserId: string;
|
||||
connections: Map<string, PeerSession>;
|
||||
lastActivity: number;
|
||||
iceCandidates: Array<Record<string, unknown>>;
|
||||
}
|
||||
|
||||
export interface PeerSession {
|
||||
targetPeerId: string;
|
||||
dataChannelReady: boolean;
|
||||
bufferedCandidates: Array<Record<string, unknown>>;
|
||||
}
|
||||
|
||||
// ── Constants ────────────────────────────────────────────────────────────────
|
||||
|
||||
const DEFAULT_CONFIG: SignalingServerConfig = {
|
||||
port: parseInt(process.env.SIGNALING_PORT || '3001', 10),
|
||||
host: process.env.SIGNALING_HOST || '0.0.0.0',
|
||||
allowedOrigins: (process.env.ALLOWED_ORIGINS || '').split(',').filter(Boolean),
|
||||
jwtSecret: process.env.JWT_SECRET || randomBytes(32).toString('hex'),
|
||||
maxMessageSize: 65536,
|
||||
idleTimeoutMs: 300_000,
|
||||
maxConnectionsPerPeer: 10,
|
||||
};
|
||||
|
||||
// Message schema validators
|
||||
const MESSAGE_TYPES = new Set(['offer', 'answer', 'ice-candidate', 'ping', 'pong', 'close']);
|
||||
|
||||
function validateMessage(raw: unknown): raw is SignalingMessage {
|
||||
if (typeof raw !== 'object' || raw === null) return false;
|
||||
const msg = raw as Record<string, unknown>;
|
||||
if (!MESSAGE_TYPES.has(msg.type as string)) return false;
|
||||
if (msg.payload && typeof msg.payload !== 'object') return false;
|
||||
if (msg.targetPeerId !== undefined && typeof msg.targetPeerId !== 'string') return false;
|
||||
if (msg.targetPeerId && msg.targetPeerId.length > 64) return false;
|
||||
return true;
|
||||
}
|
||||
|
||||
// ── JWT Helper (lightweight, no external dep) ────────────────────────────────
|
||||
|
||||
function extractJwtFromQuery(url: string): string | null {
|
||||
const match = url.match(/[?&]token=([^&]+)/);
|
||||
return match ? decodeURIComponent(match[1]) : null;
|
||||
}
|
||||
|
||||
function extractJwtFromHeader(req: IncomingMessage): string | null {
|
||||
const auth = req.headers['authorization'];
|
||||
return auth?.startsWith('Bearer ') ? auth.slice(7) : null;
|
||||
}
|
||||
|
||||
/**
|
||||
* Minimal JWT verification (HS256). In production, use jsonwebtoken.
|
||||
* Returns decoded payload or null on failure.
|
||||
*/
|
||||
function verifyJwt(token: string, secret: string): { sub: string; exp: number } | null {
|
||||
try {
|
||||
const parts = token.split('.');
|
||||
if (parts.length !== 3) return null;
|
||||
const header = JSON.parse(Buffer.from(parts[0], 'base64url').toString());
|
||||
if (header.alg !== 'HS256') return null;
|
||||
const payload = JSON.parse(Buffer.from(parts[1], 'base64url').toString());
|
||||
if (!payload.sub || typeof payload.sub !== 'string') return null;
|
||||
if (payload.exp && Date.now() / 1000 > payload.exp) return null;
|
||||
const sigInput = `${parts[0]}.${parts[1]}`;
|
||||
const crypto = require('crypto');
|
||||
const expected = crypto.createHmac('sha256', secret).update(sigInput).digest('base64url');
|
||||
if (expected !== parts[2]) return null;
|
||||
return { sub: payload.sub, exp: payload.exp || 0 };
|
||||
} catch {
|
||||
return null;
|
||||
}
|
||||
}
|
||||
|
||||
// ── Server ───────────────────────────────────────────────────────────────────
|
||||
|
||||
export class SignalingServer {
|
||||
private wss: WebSocketServer;
|
||||
private peers: Map<string, PeerConnection> = new Map();
|
||||
private config: SignalingServerConfig;
|
||||
private idleTimers: Map<string, NodeJS.Timeout> = new Map();
|
||||
|
||||
constructor(config: Partial<SignalingServerConfig> = {}) {
|
||||
this.config = { ...DEFAULT_CONFIG, ...config };
|
||||
this.wss = new WebSocketServer({
|
||||
port: this.config.port,
|
||||
host: this.config.host,
|
||||
maxPayload: this.config.maxMessageSize,
|
||||
verifyClient: this.verifyClient.bind(this),
|
||||
});
|
||||
this.wss.on('connection', this.handleConnection.bind(this));
|
||||
console.log(`[Signaling] Server listening on ${this.config.host}:${this.config.port}`);
|
||||
}
|
||||
|
||||
/**
|
||||
* Verify incoming WebSocket connection: origin + auth
|
||||
*/
|
||||
private verifyClient(info: { req: IncomingMessage; origin: string }, cb: (result: boolean, status?: number, reason?: string) => void) {
|
||||
// Origin validation
|
||||
if (this.config.allowedOrigins.length > 0) {
|
||||
const origin = info.origin || info.req.headers['origin'] || '';
|
||||
const allowed = this.config.allowedOrigins.some(
|
||||
allowedOrigin => origin === allowedOrigin || origin.startsWith(allowedOrigin)
|
||||
);
|
||||
if (!allowed) {
|
||||
cb(false, 403, `Origin "${origin}" not in allowlist`);
|
||||
return;
|
||||
}
|
||||
}
|
||||
|
||||
// JWT authentication
|
||||
const token = extractJwtFromQuery(info.req.url || '') || extractJwtFromHeader(info.req);
|
||||
if (!token) {
|
||||
cb(false, 401, 'Missing JWT token');
|
||||
return;
|
||||
}
|
||||
|
||||
const payload = verifyJwt(token, this.config.jwtSecret);
|
||||
if (!payload) {
|
||||
cb(false, 401, 'Invalid or expired JWT');
|
||||
return;
|
||||
}
|
||||
|
||||
cb(true);
|
||||
}
|
||||
|
||||
/**
|
||||
* Handle new WebSocket connection
|
||||
*/
|
||||
private handleConnection(ws: WebSocket, req: IncomingMessage) {
|
||||
const token = extractJwtFromQuery(req.url || '') || extractJwtFromHeader(req);
|
||||
const payload = token ? verifyJwt(token, this.config.jwtSecret) : null;
|
||||
const authenticatedUserId = payload?.sub || '';
|
||||
|
||||
// Server-side peer identity (crypto random)
|
||||
const peerId = `peer_${randomBytes(8).toString('hex')}`;
|
||||
|
||||
const peer: PeerConnection = {
|
||||
ws,
|
||||
peerId,
|
||||
authenticatedUserId,
|
||||
connections: new Map(),
|
||||
lastActivity: Date.now(),
|
||||
iceCandidates: [],
|
||||
};
|
||||
|
||||
this.peers.set(peerId, peer);
|
||||
|
||||
// Send handshake with assigned peer ID
|
||||
ws.send(JSON.stringify({
|
||||
type: 'handshake',
|
||||
payload: { peerId, message: 'Connected' },
|
||||
}));
|
||||
|
||||
// Idle timeout
|
||||
const timer = setTimeout(() => {
|
||||
if (Date.now() - peer.lastActivity > this.config.idleTimeoutMs) {
|
||||
ws.close(1001, 'Idle timeout');
|
||||
}
|
||||
}, this.config.idleTimeoutMs);
|
||||
this.idleTimers.set(peerId, timer);
|
||||
|
||||
ws.on('message', this.handleMessage(peer).bind(this));
|
||||
ws.on('close', () => this.handleDisconnect(peer));
|
||||
ws.on('error', (err) => {
|
||||
console.error(`[Signaling] Peer ${peerId} error:`, err.message);
|
||||
this.handleDisconnect(peer);
|
||||
});
|
||||
}
|
||||
|
||||
/**
|
||||
* Handle incoming message from peer
|
||||
*/
|
||||
private handleMessage(peer: PeerConnection) {
|
||||
return (data: Data) => {
|
||||
peer.lastActivity = Date.now();
|
||||
|
||||
// Parse with size guard
|
||||
let raw: unknown;
|
||||
try {
|
||||
const str = data.toString();
|
||||
if (str.length > this.config.maxMessageSize) {
|
||||
peer.ws.send(JSON.stringify({ type: 'error', payload: { message: 'Message too large' } }));
|
||||
return;
|
||||
}
|
||||
raw = JSON.parse(str);
|
||||
} catch {
|
||||
peer.ws.send(JSON.stringify({ type: 'error', payload: { message: 'Invalid JSON' } }));
|
||||
return;
|
||||
}
|
||||
|
||||
// Schema validation
|
||||
if (!validateMessage(raw)) {
|
||||
peer.ws.send(JSON.stringify({ type: 'error', payload: { message: 'Invalid message schema' } }));
|
||||
return;
|
||||
}
|
||||
|
||||
const msg = raw as SignalingMessage;
|
||||
|
||||
switch (msg.type) {
|
||||
case 'ping':
|
||||
peer.ws.send(JSON.stringify({ type: 'pong', payload: { timestamp: Date.now() } }));
|
||||
break;
|
||||
case 'offer':
|
||||
this.handleOffer(peer, msg);
|
||||
break;
|
||||
case 'answer':
|
||||
this.handleAnswer(peer, msg);
|
||||
break;
|
||||
case 'ice-candidate':
|
||||
this.handleIceCandidate(peer, msg);
|
||||
break;
|
||||
case 'close':
|
||||
peer.ws.close(1000, 'Peer requested close');
|
||||
break;
|
||||
}
|
||||
};
|
||||
}
|
||||
|
||||
/**
|
||||
* Route offer to target peer
|
||||
*/
|
||||
private handleOffer(source: PeerConnection, msg: SignalingMessage) {
|
||||
const targetId = msg.targetPeerId;
|
||||
if (!targetId) {
|
||||
source.ws.send(JSON.stringify({ type: 'error', payload: { message: 'Missing targetPeerId' } }));
|
||||
return;
|
||||
}
|
||||
|
||||
// Enforce max connections
|
||||
if (source.connections.size >= this.config.maxConnectionsPerPeer) {
|
||||
source.ws.send(JSON.stringify({ type: 'error', payload: { message: 'Max connections reached' } }));
|
||||
return;
|
||||
}
|
||||
|
||||
const target = this.peers.get(targetId);
|
||||
if (!target) {
|
||||
source.ws.send(JSON.stringify({ type: 'error', payload: { message: `Peer ${targetId} not found` } }));
|
||||
return;
|
||||
}
|
||||
|
||||
// Register session
|
||||
const session: PeerSession = {
|
||||
targetPeerId: targetId,
|
||||
dataChannelReady: false,
|
||||
bufferedCandidates: [...source.iceCandidates],
|
||||
};
|
||||
source.connections.set(targetId, session);
|
||||
target.connections.set(source.peerId, {
|
||||
targetPeerId: source.peerId,
|
||||
dataChannelReady: false,
|
||||
bufferedCandidates: [],
|
||||
});
|
||||
|
||||
// Forward offer to target
|
||||
target.ws.send(JSON.stringify({
|
||||
type: 'offer',
|
||||
payload: msg.payload,
|
||||
targetPeerId: source.peerId,
|
||||
}));
|
||||
|
||||
// Send buffered ICE candidates if data channel is ready
|
||||
if (session.dataChannelReady) {
|
||||
for (const candidate of session.bufferedCandidates) {
|
||||
target.ws.send(JSON.stringify({
|
||||
type: 'ice-candidate',
|
||||
payload: candidate,
|
||||
targetPeerId: source.peerId,
|
||||
}));
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Route answer to target peer
|
||||
*/
|
||||
private handleAnswer(source: PeerConnection, msg: SignalingMessage) {
|
||||
const targetId = msg.targetPeerId;
|
||||
if (!targetId) {
|
||||
source.ws.send(JSON.stringify({ type: 'error', payload: { message: 'Missing targetPeerId' } }));
|
||||
return;
|
||||
}
|
||||
|
||||
const target = this.peers.get(targetId);
|
||||
if (!target) {
|
||||
source.ws.send(JSON.stringify({ type: 'error', payload: { message: `Peer ${targetId} not found` } }));
|
||||
return;
|
||||
}
|
||||
|
||||
// Mark data channel as ready for buffered candidate delivery
|
||||
const session = source.connections.get(targetId);
|
||||
if (session) {
|
||||
session.dataChannelReady = true;
|
||||
}
|
||||
|
||||
target.ws.send(JSON.stringify({
|
||||
type: 'answer',
|
||||
payload: msg.payload,
|
||||
targetPeerId: source.peerId,
|
||||
}));
|
||||
}
|
||||
|
||||
/**
|
||||
* Route ICE candidate to target peer
|
||||
*/
|
||||
private handleIceCandidate(source: PeerConnection, msg: SignalingMessage) {
|
||||
const targetId = msg.targetPeerId;
|
||||
if (!targetId) {
|
||||
source.ws.send(JSON.stringify({ type: 'error', payload: { message: 'Missing targetPeerId' } }));
|
||||
return;
|
||||
}
|
||||
|
||||
const candidate = msg.payload as Record<string, unknown> | undefined;
|
||||
if (!candidate) return;
|
||||
|
||||
// Buffer candidate if target session not ready yet
|
||||
const session = source.connections.get(targetId);
|
||||
if (session && !session.dataChannelReady) {
|
||||
source.iceCandidates.push(candidate);
|
||||
return;
|
||||
}
|
||||
|
||||
const target = this.peers.get(targetId);
|
||||
if (!target) return;
|
||||
|
||||
target.ws.send(JSON.stringify({
|
||||
type: 'ice-candidate',
|
||||
payload: candidate,
|
||||
targetPeerId: source.peerId,
|
||||
}));
|
||||
}
|
||||
|
||||
/**
|
||||
* Handle peer disconnect
|
||||
*/
|
||||
private handleDisconnect(peer: PeerConnection) {
|
||||
// Notify connected peers
|
||||
for (const [targetId, session] of peer.connections) {
|
||||
const target = this.peers.get(targetId);
|
||||
if (target) {
|
||||
target.ws.send(JSON.stringify({
|
||||
type: 'close',
|
||||
payload: { peerId: peer.peerId, reason: 'Remote peer disconnected' },
|
||||
targetPeerId: peer.peerId,
|
||||
}));
|
||||
target.connections.delete(peer.peerId);
|
||||
}
|
||||
}
|
||||
|
||||
// Clear idle timer
|
||||
const timer = this.idleTimers.get(peer.peerId);
|
||||
if (timer) clearTimeout(timer);
|
||||
this.idleTimers.delete(peer.peerId);
|
||||
|
||||
this.peers.delete(peer.peerId);
|
||||
console.log(`[Signaling] Peer ${peer.peerId} disconnected`);
|
||||
}
|
||||
|
||||
/**
|
||||
* Graceful shutdown with timeout
|
||||
*/
|
||||
async stop(timeoutMs = 5000): Promise<void> {
|
||||
return new Promise((resolve) => {
|
||||
const deadline = Date.now() + timeoutMs;
|
||||
|
||||
for (const [peerId, peer] of this.peers) {
|
||||
const remaining = Math.max(100, deadline - Date.now());
|
||||
setTimeout(() => {
|
||||
peer.ws.close(1001, 'Server shutting down');
|
||||
}, remaining);
|
||||
}
|
||||
|
||||
const serverTimer = setTimeout(() => {
|
||||
this.wss.close();
|
||||
resolve();
|
||||
}, timeoutMs);
|
||||
|
||||
this.wss.close(() => {
|
||||
clearTimeout(serverTimer);
|
||||
resolve();
|
||||
});
|
||||
});
|
||||
}
|
||||
|
||||
/**
|
||||
* Get server stats
|
||||
*/
|
||||
getStats() {
|
||||
return {
|
||||
connectedPeers: this.peers.size,
|
||||
totalConnections: Array.from(this.peers.values()).reduce((sum, p) => sum + p.connections.size, 0),
|
||||
};
|
||||
}
|
||||
}
|
||||
|
||||
export function createSignalingServer(config?: Partial<SignalingServerConfig>): SignalingServer {
|
||||
return new SignalingServer(config);
|
||||
}
|
||||
Reference in New Issue
Block a user