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:
258
packages/shared-notifications/src/services/template.service.ts
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258
packages/shared-notifications/src/services/template.service.ts
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import type {
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TemplateDefinition,
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ResolvedTemplate,
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TemplateResolutionOptions,
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TemplateCacheEntry,
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TemplateStore,
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TemplateVariable,
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} from '../types/template.types';
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import { AllDefaultTemplates, DEFAULT_LOCALE } from '../templates/default-templates';
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const CACHE_TTL_MS = 300000;
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const VARIABLE_PATTERN = /\{\{(\w+)\}\}/g;
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export class TemplateService {
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private static instance: TemplateService;
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private templateStore: TemplateStore;
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private cache: Map<string, TemplateCacheEntry>;
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private customTemplates: Map<string, TemplateDefinition[]>;
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private constructor() {
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this.templateStore = new Map();
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this.cache = new Map();
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this.customTemplates = new Map();
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this.initializeDefaults();
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}
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static getInstance(): TemplateService {
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if (!TemplateService.instance) {
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TemplateService.instance = new TemplateService();
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}
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return TemplateService.instance;
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}
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private initializeDefaults() {
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for (const template of AllDefaultTemplates) {
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const key = this.getStoreKey(template.id, template.locale);
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if (!this.templateStore.has(template.id)) {
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this.templateStore.set(template.id, new Map());
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}
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this.templateStore.get(template.id)!.set(template.locale, template);
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}
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}
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private getStoreKey(templateId: string, locale: string): string {
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return `${templateId}:${locale}`;
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}
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private getCacheKey(templateId: string, locale: string): string {
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return `${templateId}:${locale}`;
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}
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registerTemplate(template: TemplateDefinition): void {
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if (!this.templateStore.has(template.id)) {
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this.templateStore.set(template.id, new Map());
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}
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const localeMap = this.templateStore.get(template.id)!;
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localeMap.set(template.locale, template);
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this.invalidateCache(template.id, template.locale);
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}
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registerTemplates(templates: TemplateDefinition[]): void {
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for (const template of templates) {
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this.registerTemplate(template);
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}
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}
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resolveTemplate(options: TemplateResolutionOptions): ResolvedTemplate | null {
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const { templateId, locale = DEFAULT_LOCALE, variables, fallbackLocale = DEFAULT_LOCALE } = options;
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const cached = this.getCached(templateId, locale);
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if (cached) {
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return this.renderTemplate(cached, variables || {});
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}
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const template = this.findTemplate(templateId, locale, fallbackLocale);
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if (!template) {
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return null;
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}
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this.cacheTemplate(template);
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return this.renderTemplate(template, variables || {});
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}
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private findTemplate(
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templateId: string,
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locale: string,
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fallbackLocale: string
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): TemplateDefinition | null {
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const localeMap = this.templateStore.get(templateId);
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if (!localeMap) {
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return null;
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}
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const normalizedLocale = this.normalizeLocale(locale);
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if (localeMap.has(normalizedLocale)) {
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return localeMap.get(normalizedLocale)!;
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}
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const languageCode = normalizedLocale.split('-')[0];
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for (const [key, template] of localeMap.entries()) {
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if (key.split('-')[0] === languageCode && key !== normalizedLocale) {
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return template;
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}
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}
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if (localeMap.has(fallbackLocale)) {
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return localeMap.get(fallbackLocale)!;
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}
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for (const [key] of localeMap.entries()) {
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if (key.split('-')[0] === fallbackLocale.split('-')[0]) {
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return localeMap.get(key)!;
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}
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}
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const firstTemplate = localeMap.values().next().value;
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return firstTemplate || null;
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}
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private normalizeLocale(locale: string): string {
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const parts = locale.toLowerCase().split(/[-_]/);
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if (parts.length === 1) {
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return parts[0];
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}
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return parts[0] + '-' + parts[1].toUpperCase();
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}
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private renderTemplate(
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template: TemplateDefinition,
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variables: Record<string, unknown>
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): ResolvedTemplate {
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const subject = template.subject
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? this.substituteVariables(template.subject, variables, template.variables)
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: template.subject;
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const body = this.substituteVariables(
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template.body,
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variables,
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template.variables
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);
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const htmlBody = template.htmlBody
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? this.substituteVariables(template.htmlBody, variables, template.variables)
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: template.htmlBody;
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return {
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id: template.id,
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subject,
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body,
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htmlBody,
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locale: template.locale,
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channel: template.channel,
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};
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}
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private substituteVariables(
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text: string,
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variables: Record<string, unknown>,
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schema: TemplateVariable[]
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): string {
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const varMap = new Map<string, TemplateVariable>();
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for (const v of schema) {
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varMap.set(v.name, v);
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}
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return text.replace(VARIABLE_PATTERN, (match, varName) => {
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const value = variables[varName];
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if (value !== undefined) {
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return String(value);
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}
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const schemaVar = varMap.get(varName);
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if (schemaVar?.defaultValue !== undefined) {
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return schemaVar.defaultValue;
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}
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return match;
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});
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}
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private getCached(templateId: string, locale: string): TemplateDefinition | null {
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const cacheKey = this.getCacheKey(templateId, locale);
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const entry = this.cache.get(cacheKey);
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if (!entry) {
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return null;
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}
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const age = Date.now() - entry.resolvedAt.getTime();
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if (age > entry.ttl) {
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this.cache.delete(cacheKey);
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return null;
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}
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return entry.template;
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}
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private cacheTemplate(template: TemplateDefinition): void {
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const cacheKey = this.getCacheKey(template.id, template.locale);
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this.cache.set(cacheKey, {
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template,
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resolvedAt: new Date(),
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ttl: CACHE_TTL_MS,
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});
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}
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private invalidateCache(templateId: string, locale: string): void {
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const cacheKey = this.getCacheKey(templateId, locale);
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this.cache.delete(cacheKey);
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}
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getAvailableLocales(templateId: string): string[] {
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const localeMap = this.templateStore.get(templateId);
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if (!localeMap) {
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return [];
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}
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return Array.from(localeMap.keys());
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}
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getTemplateIds(): string[] {
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return Array.from(this.templateStore.keys());
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}
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getTemplateInfo(templateId: string): {
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id: string;
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locales: string[];
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channel: string;
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category: string;
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variables: string[];
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} | null {
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const localeMap = this.templateStore.get(templateId);
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if (!localeMap) {
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return null;
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}
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const firstTemplate = localeMap.values().next().value;
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if (!firstTemplate) {
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return null;
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}
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return {
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id: templateId,
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locales: Array.from(localeMap.keys()),
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channel: firstTemplate.channel,
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category: firstTemplate.category,
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variables: firstTemplate.variables.map(v => v.name),
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};
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}
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clearCache(): void {
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this.cache.clear();
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}
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getCacheStats(): { size: number; totalTemplates: number } {
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return {
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size: this.cache.size,
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totalTemplates: this.templateStore.size,
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};
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}
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}
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