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:
288
services/spamshield/src/engine/decision-engine.ts
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288
services/spamshield/src/engine/decision-engine.ts
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import { SpamShieldService, ReputationResult } from '../services/spamshield.service';
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import { RuleEngine, RuleMatch } from './rule-engine';
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export interface CallMetadata {
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callId: string;
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startTime: Date;
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duration?: number;
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direction: 'inbound' | 'outbound';
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callType?: 'voice' | 'video' | 'sms';
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carrierInfo?: Record<string, any>;
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}
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export interface SmsContent {
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messageId: string;
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body: string;
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timestamp: Date;
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direction: 'inbound' | 'outbound';
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}
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export interface UserSpamHistory {
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phoneNumberHash: string;
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spamCount: number;
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hamCount: number;
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lastSpamReportedAt?: Date;
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userPreference?: 'block' | 'flag' | 'allow';
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}
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export interface DecisionContext {
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phoneNumber: string;
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phoneNumberHash?: string;
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callMetadata?: CallMetadata;
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smsContent?: SmsContent;
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cachedReputation: ReputationResult;
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ruleMatches: RuleMatch[];
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userHistory?: UserSpamHistory;
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}
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export interface DecisionResult {
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decision: 'BLOCK' | 'FLAG' | 'ALLOW';
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confidence: number;
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reasons: string[];
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fallbackDecision: 'BLOCK' | 'FLAG' | 'ALLOW';
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scoring: {
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reputationScore: number;
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ruleScore: number;
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behavioralScore: number;
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userHistoryScore: number;
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totalScore: number;
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};
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executedAt: Date;
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}
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export interface DecisionEngineConfig {
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// Scoring weights
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reputationWeight?: number;
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ruleWeight?: number;
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behavioralWeight?: number;
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userHistoryWeight?: number;
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// Thresholds
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blockThreshold?: number;
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flagThreshold?: number;
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// Timeouts
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evaluationTimeout?: number;
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// Fallback behavior
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fallbackOnTimeout?: boolean;
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fallbackDecision?: 'BLOCK' | 'FLAG' | 'ALLOW';
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}
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const DEFAULT_CONFIG: Required<DecisionEngineConfig> = {
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reputationWeight: 0.4,
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ruleWeight: 0.3,
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behavioralWeight: 0.2,
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userHistoryWeight: 0.1,
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blockThreshold: 0.85,
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flagThreshold: 0.60,
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evaluationTimeout: 200,
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fallbackOnTimeout: true,
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fallbackDecision: 'ALLOW',
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};
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export class DecisionEngine {
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private readonly config: Required<DecisionEngineConfig>;
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private readonly reputationService: SpamShieldService;
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private readonly ruleEngine: RuleEngine;
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constructor(
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reputationService: SpamShieldService,
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ruleEngine: RuleEngine,
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config?: DecisionEngineConfig
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) {
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this.config = { ...DEFAULT_CONFIG, ...config };
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this.reputationService = reputationService;
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this.ruleEngine = ruleEngine;
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}
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async evaluate(context: DecisionContext): Promise<DecisionResult> {
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const startTime = Date.now();
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try {
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const [reputationScore, ruleScore, behavioralScore, userHistoryScore] = await Promise.all([
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this.calculateReputationScore(context.cachedReputation),
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this.calculateRuleScore(context.ruleMatches),
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this.calculateBehavioralScore(context),
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this.calculateUserHistoryScore(context.userHistory),
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]);
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const totalScore =
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reputationScore * this.config.reputationWeight +
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ruleScore * this.config.ruleWeight +
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behavioralScore * this.config.behavioralWeight +
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userHistoryScore * this.config.userHistoryWeight;
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const decision = this.applyThresholds(totalScore);
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const reasons = this.collectReasons(
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reputationScore, ruleScore, behavioralScore, userHistoryScore, context.ruleMatches
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);
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return {
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decision,
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confidence: totalScore,
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reasons,
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fallbackDecision: this.config.fallbackDecision,
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scoring: {
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reputationScore,
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ruleScore,
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behavioralScore,
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userHistoryScore,
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totalScore,
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},
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executedAt: new Date(),
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};
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} catch (error) {
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console.error('[DecisionEngine] Evaluation error:', error);
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if (this.config.fallbackOnTimeout) {
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return {
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decision: this.config.fallbackDecision,
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confidence: 0.5,
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reasons: ['Fallback decision due to evaluation error'],
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fallbackDecision: this.config.fallbackDecision,
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scoring: {
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reputationScore: 0.5,
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ruleScore: 0.5,
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behavioralScore: 0.5,
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userHistoryScore: 0.5,
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totalScore: 0.5,
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},
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executedAt: new Date(),
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};
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}
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throw error;
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}
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}
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private async calculateReputationScore(reputation: ReputationResult): Promise<number> {
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return reputation.score;
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}
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private async calculateRuleScore(ruleMatches: RuleMatch[]): Promise<number> {
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if (ruleMatches.length === 0) {
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return 0;
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}
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const totalScore = ruleMatches.reduce((sum, match) => sum + match.score, 0);
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return Math.min(totalScore, 1.0);
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}
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private async calculateBehavioralScore(context: DecisionContext): Promise<number> {
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let score = 0;
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if (context.callMetadata) {
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const { callMetadata } = context;
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if (callMetadata.duration && callMetadata.duration < 5) {
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score += 0.3;
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}
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if (callMetadata.callType === 'sms') {
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score += 0.1;
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}
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}
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if (context.smsContent) {
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const { smsContent } = context;
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if (smsContent.body.length < 10) {
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score += 0.2;
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}
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if (/\b(URGENT|ACT NOW|LIMITED)\b/i.test(smsContent.body)) {
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score += 0.3;
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}
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}
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return Math.min(score, 1.0);
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}
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private async calculateUserHistoryScore(userHistory?: UserSpamHistory): Promise<number> {
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if (!userHistory) {
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return 0.5;
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}
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const totalReports = userHistory.spamCount + userHistory.hamCount;
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if (totalReports === 0) {
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return 0.5;
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}
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const spamRatio = userHistory.spamCount / totalReports;
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if (userHistory.userPreference) {
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switch (userHistory.userPreference) {
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case 'block':
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return 1.0;
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case 'flag':
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return 0.6;
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case 'allow':
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return 0.2;
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}
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}
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return spamRatio;
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}
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private applyThresholds(score: number): 'BLOCK' | 'FLAG' | 'ALLOW' {
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if (score >= this.config.blockThreshold) {
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return 'BLOCK';
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}
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if (score >= this.config.flagThreshold) {
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return 'FLAG';
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}
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return 'ALLOW';
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}
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private collectReasons(
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reputationScore: number,
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ruleScore: number,
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behavioralScore: number,
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userHistoryScore: number,
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ruleMatches: RuleMatch[]
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): string[] {
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const reasons: string[] = [];
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if (reputationScore > 0.8) {
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reasons.push(`High reputation spam score: ${reputationScore.toFixed(2)}`);
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}
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if (ruleMatches.length > 0) {
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reasons.push(`Matched ${ruleMatches.length} spam rule(s)`);
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ruleMatches.forEach(match => {
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reasons.push(` - ${match.ruleName} (${match.score.toFixed(2)})`);
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});
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}
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if (behavioralScore > 0.5) {
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reasons.push(`Suspicious behavioral pattern detected`);
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}
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if (userHistoryScore > 0.7) {
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reasons.push(`User history indicates high spam probability`);
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}
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if (reasons.length === 0) {
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reasons.push('No spam indicators detected');
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}
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return reasons;
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}
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getConfig(): Required<DecisionEngineConfig> {
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return { ...this.config };
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}
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updateConfig(config: Partial<DecisionEngineConfig>): void {
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this.config.reputationWeight = config.reputationWeight ?? this.config.reputationWeight;
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this.config.ruleWeight = config.ruleWeight ?? this.config.ruleWeight;
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this.config.behavioralWeight = config.behavioralWeight ?? this.config.behavioralWeight;
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this.config.userHistoryWeight = config.userHistoryWeight ?? this.config.userHistoryWeight;
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this.config.blockThreshold = config.blockThreshold ?? this.config.blockThreshold;
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this.config.flagThreshold = config.flagThreshold ?? this.config.flagThreshold;
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this.config.evaluationTimeout = config.evaluationTimeout ?? this.config.evaluationTimeout;
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this.config.fallbackOnTimeout = config.fallbackOnTimeout ?? this.config.fallbackOnTimeout;
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this.config.fallbackDecision = config.fallbackDecision ?? this.config.fallbackDecision;
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}
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}
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2
services/spamshield/src/engine/index.ts
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2
services/spamshield/src/engine/index.ts
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@@ -0,0 +1,2 @@
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export * from './decision-engine';
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export * from './rule-engine';
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148
services/spamshield/src/engine/rule-engine.ts
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148
services/spamshield/src/engine/rule-engine.ts
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@@ -0,0 +1,148 @@
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import { PrismaClient, SpamRule } from '@prisma/client';
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export interface RuleMatch {
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ruleId: string;
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ruleName: string;
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pattern: string;
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score: number;
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priority: 'high' | 'medium' | 'low';
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matchedAt: Date;
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}
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export interface RuleEngineConfig {
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loadIntervalMs?: number;
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enableCache?: boolean;
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cacheTtlMs?: number;
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}
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const DEFAULT_CONFIG: Required<RuleEngineConfig> = {
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loadIntervalMs: 60000,
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enableCache: true,
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cacheTtlMs: 300000,
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};
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export class RuleEngine {
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private readonly config: Required<RuleEngineConfig>;
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private numberPatternRules: SpamRule[] = [];
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private behavioralRules: SpamRule[] = [];
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private contentRules: SpamRule[] = [];
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private allRules: SpamRule[] = [];
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private lastLoadTime: Date | null = null;
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private readonly prisma: PrismaClient;
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constructor(prisma?: PrismaClient, config?: RuleEngineConfig) {
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this.prisma = prisma ?? new PrismaClient() as PrismaClient;
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this.config = { ...DEFAULT_CONFIG, ...config };
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}
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async loadActiveRules(): Promise<void> {
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const now = new Date();
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if (this.config.enableCache && this.lastLoadTime) {
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const elapsed = now.getTime() - this.lastLoadTime.getTime();
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if (elapsed < this.config.loadIntervalMs) {
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return;
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}
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}
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const rules = await this.prisma.spamRule.findMany({
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where: { isActive: true },
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orderBy: { priority: 'desc' },
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});
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this.allRules = rules;
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this.numberPatternRules = rules.filter(r => r.category === 'number_pattern');
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this.behavioralRules = rules.filter(r => r.category === 'behavioral');
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this.contentRules = rules.filter(r => r.category === 'content');
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this.lastLoadTime = now;
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}
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async evaluate(phoneNumber: string): Promise<RuleMatch[]> {
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if (this.allRules.length === 0) {
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await this.loadActiveRules();
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}
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const matches: RuleMatch[] = [];
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for (const rule of this.allRules) {
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try {
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const pattern = new RegExp(rule.pattern);
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if (pattern.test(phoneNumber)) {
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matches.push({
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ruleId: rule.id,
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ruleName: rule.name,
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pattern: rule.pattern,
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score: rule.score,
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priority: rule.priority as 'high' | 'medium' | 'low',
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matchedAt: new Date(),
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});
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}
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} catch (error) {
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console.error(`[RuleEngine] Invalid pattern for rule ${rule.id}:`, error);
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}
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}
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return matches.sort((a, b) => b.score - a.score);
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}
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async evaluateSms(smsBody: string): Promise<RuleMatch[]> {
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if (this.contentRules.length === 0) {
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await this.loadActiveRules();
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}
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const matches: RuleMatch[] = [];
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for (const rule of this.contentRules) {
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try {
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const pattern = new RegExp(rule.pattern, 'i');
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if (pattern.test(smsBody)) {
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matches.push({
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ruleId: rule.id,
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ruleName: rule.name,
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pattern: rule.pattern,
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score: rule.score,
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priority: rule.priority as 'high' | 'medium' | 'low',
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matchedAt: new Date(),
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});
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}
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} catch (error) {
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console.error(`[RuleEngine] Invalid pattern for rule ${rule.id}:`, error);
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}
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}
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return matches.sort((a, b) => b.score - a.score);
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}
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getNumberPatternRules(): SpamRule[] {
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return [...this.numberPatternRules];
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}
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getBehavioralRules(): SpamRule[] {
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return [...this.behavioralRules];
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}
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getContentRules(): SpamRule[] {
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return [...this.contentRules];
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}
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getAllRules(): SpamRule[] {
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return [...this.allRules];
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}
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async refreshRules(): Promise<void> {
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this.lastLoadTime = null;
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await this.loadActiveRules();
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}
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clearCache(): void {
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this.allRules = [];
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this.numberPatternRules = [];
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this.behavioralRules = [];
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this.contentRules = [];
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this.lastLoadTime = null;
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}
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getConfig(): Required<RuleEngineConfig> {
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return { ...this.config };
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}
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}
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Reference in New Issue
Block a user