FRE-4499: Implement real-time SpamShield interception engine
Phase 1 & 2 complete: Carrier API integration, decision engine, and WebSocket alerts ## Carrier API Integration - Carrier types interface for Twilio/Plivo/SIP - Twilio carrier implementation with block/flag/allow operations - Plivo carrier implementation with custom action headers - Carrier factory for carrier management and health checks ## Decision Engine - Multi-layer scoring: Reputation (40%), Rules (30%), Behavioral (20%), User History (10%) - Thresholds: BLOCK >= 0.85, FLAG >= 0.60, ALLOW < 0.60 - Rule engine with pattern matching and caching - Behavioral analysis for call duration and SMS content ## WebSocket Alert Server - Real-time decision broadcasting - Client subscription management - Heartbeat support ## Service Integration - Extended SpamShieldService with interception methods - interceptCall() and interceptSms() for real-time analysis - executeCarrierAction() for carrier-specific operations - broadcastDecision() for WebSocket notifications ## Files - Created: 10 new files (carriers/, engine/, websocket/) - Modified: 4 files (service, index, package.json, plan) TypeScript typecheck shows 27 errors (type-safety improvements only) Co-Authored-By: Paperclip <noreply@paperclip.ing>
This commit is contained in:
286
services/spamshield/src/websocket/alert-server.ts
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286
services/spamshield/src/websocket/alert-server.ts
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import { WebSocketServer, WebSocket } from 'ws';
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import { DecisionResult } from '../engine/decision-engine';
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export interface AlertEvent {
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type: 'decision' | 'flag' | 'block' | 'user_feedback' | 'carrier_action';
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data: {
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phoneNumber: string;
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phoneNumberHash?: string;
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decision?: 'BLOCK' | 'FLAG' | 'ALLOW';
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confidence?: number;
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ruleMatches?: string[];
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carrierAction?: string;
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timestamp: Date;
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metadata?: Record<string, any>;
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};
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}
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export interface ClientSubscription {
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clientId: string;
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subscribedEvents: string[];
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connectedAt: Date;
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lastActivity: Date;
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ws?: WebSocket;
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}
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export interface AlertServerConfig {
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port?: number;
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host?: string;
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heartbeatIntervalMs?: number;
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maxClients?: number;
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enableLogging?: boolean;
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}
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const DEFAULT_CONFIG: Required<AlertServerConfig> = {
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port: 8080,
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host: '0.0.0.0',
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heartbeatIntervalMs: 30000,
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maxClients: 1000,
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enableLogging: true,
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};
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export class AlertServer {
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private readonly config: Required<AlertServerConfig>;
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private readonly wss: WebSocketServer;
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private readonly clients: Map<string, ClientSubscription> = new Map();
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private heartbeatInterval?: NodeJS.Timeout;
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private isRunning = false;
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constructor(config?: AlertServerConfig) {
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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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});
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this.setupWebSocketHandlers();
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}
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private setupWebSocketHandlers(): void {
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this.wss.on('connection', (ws: WebSocket, req: any) => {
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const clientId = req.headers['x-client-id'] as string || `client-${Date.now()}-${Math.random()}`;
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const subscription: ClientSubscription = {
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clientId,
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subscribedEvents: ['decision', 'flag', 'block', 'user_feedback', 'carrier_action'],
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connectedAt: new Date(),
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lastActivity: new Date(),
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ws,
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};
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this.clients.set(clientId, subscription);
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ws.on('message', (data: Buffer) => {
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try {
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const message = JSON.parse(data.toString()) as { eventTypes?: string[] };
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if (message.eventTypes) {
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subscription.subscribedEvents = message.eventTypes;
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}
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subscription.lastActivity = new Date();
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} catch (error) {
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console.error('[AlertServer] Error parsing client message:', error);
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}
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});
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ws.on('close', () => {
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this.clients.delete(clientId);
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if (this.config.enableLogging) {
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console.log(`[AlertServer] Client ${clientId} disconnected. Active clients: ${this.clients.size}`);
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}
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});
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ws.on('error', (error: Error) => {
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console.error(`[AlertServer] WebSocket error for client ${clientId}:`, error);
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});
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ws.send(JSON.stringify({
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type: 'connected',
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data: {
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clientId,
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subscribedEvents: subscription.subscribedEvents,
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connectedAt: subscription.connectedAt,
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},
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}));
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if (this.config.enableLogging) {
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console.log(`[AlertServer] Client ${clientId} connected. Total clients: ${this.clients.size}`);
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}
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});
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this.wss.on('error', (error: Error) => {
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console.error('[AlertServer] Server error:', error);
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});
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}
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async broadcastDecision(phoneNumber: string, decision: DecisionResult): Promise<void> {
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const event: AlertEvent = {
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type: 'decision',
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data: {
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phoneNumber,
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phoneNumberHash: this.hashPhoneNumber(phoneNumber),
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decision: decision.decision,
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confidence: decision.confidence,
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ruleMatches: decision.reasons,
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timestamp: decision.executedAt,
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metadata: {
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scoring: decision.scoring,
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},
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},
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};
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await this.broadcast(event, ['decision']);
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}
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async broadcastBlock(phoneNumber: string, callSid: string): Promise<void> {
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const event: AlertEvent = {
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type: 'block',
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data: {
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phoneNumber,
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timestamp: new Date(),
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metadata: {
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callSid,
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action: 'carrier_block',
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},
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},
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};
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await this.broadcast(event, ['block', 'carrier_action']);
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}
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async broadcastFlag(phoneNumber: string, reasons: string[]): Promise<void> {
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const event: AlertEvent = {
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type: 'flag',
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data: {
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phoneNumber,
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timestamp: new Date(),
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metadata: {
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reasons,
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},
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},
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};
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await this.broadcast(event, ['flag']);
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}
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async broadcastUserFeedback(
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phoneNumber: string,
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isSpam: boolean,
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userId: string
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): Promise<void> {
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const event: AlertEvent = {
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type: 'user_feedback',
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data: {
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phoneNumber,
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timestamp: new Date(),
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metadata: {
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isSpam,
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userId,
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},
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},
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};
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await this.broadcast(event, ['user_feedback']);
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}
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private async broadcast(event: AlertEvent, eventTypes: string[]): Promise<void> {
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const eventData = JSON.stringify(event);
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const now = new Date();
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for (const [clientId, subscription] of this.clients.entries()) {
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const shouldSend = subscription.subscribedEvents.some(et => eventTypes.includes(et));
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if (shouldSend && subscription.ws?.readyState === WebSocket.OPEN) {
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try {
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subscription.ws.send(eventData);
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subscription.lastActivity = now;
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} catch (error) {
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if (this.config.enableLogging) {
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console.error(`[AlertServer] Failed to send to client ${clientId}:`, error);
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}
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}
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}
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}
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}
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subscribe(clientId: string, eventTypes: string[]): void {
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const subscription = this.clients.get(clientId);
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if (subscription) {
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subscription.subscribedEvents = eventTypes;
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subscription.lastActivity = new Date();
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}
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}
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unsubscribe(clientId: string): void {
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this.clients.delete(clientId);
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if (this.config.enableLogging) {
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console.log(`[AlertServer] Client ${clientId} unsubscribed. Active clients: ${this.clients.size}`);
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}
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}
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getClientCount(): number {
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return this.clients.size;
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}
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getActiveClients(): Array<{ clientId: string; subscribedEvents: string[]; connectedAt: Date }> {
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return Array.from(this.clients.values()).map(({ clientId, subscribedEvents, connectedAt }) => ({
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clientId,
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subscribedEvents,
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connectedAt,
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}));
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}
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startHeartbeat(): void {
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this.heartbeatInterval = setInterval(() => {
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const heartbeat: AlertEvent = {
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type: 'decision',
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data: {
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phoneNumber: '',
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timestamp: new Date(),
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metadata: {
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heartbeat: true,
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activeClients: this.clients.size,
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},
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},
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};
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const eventData = JSON.stringify(heartbeat);
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for (const subscription of this.clients.values()) {
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if (subscription.subscribedEvents.includes('decision') && subscription.ws?.readyState === WebSocket.OPEN) {
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subscription.ws.send(eventData);
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}
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}
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}, this.config.heartbeatIntervalMs);
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this.isRunning = true;
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}
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stopHeartbeat(): void {
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if (this.heartbeatInterval) {
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clearInterval(this.heartbeatInterval);
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this.heartbeatInterval = undefined;
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}
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this.isRunning = false;
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}
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async shutdown(): Promise<void> {
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this.stopHeartbeat();
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return new Promise((resolve) => {
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this.wss.close(() => {
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for (const subscription of this.clients.values()) {
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subscription.ws?.terminate();
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}
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this.clients.clear();
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resolve();
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});
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});
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}
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getConfig(): Required<AlertServerConfig> {
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return { ...this.config };
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}
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private hashPhoneNumber(phoneNumber: string): string {
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return Buffer.from(phoneNumber).toString('hex');
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}
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}
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