731 lines
23 KiB
TypeScript
731 lines
23 KiB
TypeScript
import * as plugins from '../../plugins.js';
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import * as paths from '../../paths.js';
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import { logger } from '../../logger.js';
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import { SecurityLogger, SecurityLogLevel, SecurityEventType } from '../../security/index.js';
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import { RustSecurityBridge } from '../../security/classes.rustsecuritybridge.js';
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import { LRUCache } from 'lru-cache';
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import type { Email } from './classes.email.js';
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/**
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* Bounce types for categorizing the reasons for bounces
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*/
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export enum BounceType {
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// Hard bounces (permanent failures)
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INVALID_RECIPIENT = 'invalid_recipient',
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DOMAIN_NOT_FOUND = 'domain_not_found',
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MAILBOX_FULL = 'mailbox_full',
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MAILBOX_INACTIVE = 'mailbox_inactive',
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BLOCKED = 'blocked',
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SPAM_RELATED = 'spam_related',
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POLICY_RELATED = 'policy_related',
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// Soft bounces (temporary failures)
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SERVER_UNAVAILABLE = 'server_unavailable',
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TEMPORARY_FAILURE = 'temporary_failure',
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QUOTA_EXCEEDED = 'quota_exceeded',
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NETWORK_ERROR = 'network_error',
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TIMEOUT = 'timeout',
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// Special cases
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AUTO_RESPONSE = 'auto_response',
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CHALLENGE_RESPONSE = 'challenge_response',
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UNKNOWN = 'unknown'
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}
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/**
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* Hard vs soft bounce classification
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*/
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export enum BounceCategory {
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HARD = 'hard',
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SOFT = 'soft',
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AUTO_RESPONSE = 'auto_response',
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UNKNOWN = 'unknown'
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}
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/**
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* Bounce data structure
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*/
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export interface BounceRecord {
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id: string;
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originalEmailId?: string;
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recipient: string;
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sender: string;
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domain: string;
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subject?: string;
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bounceType: BounceType;
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bounceCategory: BounceCategory;
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timestamp: number;
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smtpResponse?: string;
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diagnosticCode?: string;
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statusCode?: string;
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headers?: Record<string, string>;
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processed: boolean;
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retryCount?: number;
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nextRetryTime?: number;
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}
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/**
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* Retry strategy configuration for soft bounces
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*/
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interface RetryStrategy {
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maxRetries: number;
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initialDelay: number; // milliseconds
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maxDelay: number; // milliseconds
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backoffFactor: number;
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}
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/**
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* Manager for handling email bounces
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*/
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export class BounceManager {
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// Retry strategy with exponential backoff
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private retryStrategy: RetryStrategy = {
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maxRetries: 5,
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initialDelay: 15 * 60 * 1000, // 15 minutes
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maxDelay: 24 * 60 * 60 * 1000, // 24 hours
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backoffFactor: 2
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};
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// Store of bounced emails
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private bounceStore: BounceRecord[] = [];
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// Cache of recently bounced email addresses to avoid sending to known bad addresses
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private bounceCache: LRUCache<string, {
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lastBounce: number;
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count: number;
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type: BounceType;
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category: BounceCategory;
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}>;
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// Suppression list for addresses that should not receive emails
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private suppressionList: Map<string, {
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reason: string;
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timestamp: number;
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expiresAt?: number; // undefined means permanent
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}> = new Map();
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private storageManager?: any; // StorageManager instance
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constructor(options?: {
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retryStrategy?: Partial<RetryStrategy>;
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maxCacheSize?: number;
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cacheTTL?: number;
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storageManager?: any;
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}) {
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// Set retry strategy with defaults
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if (options?.retryStrategy) {
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this.retryStrategy = {
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...this.retryStrategy,
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...options.retryStrategy
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};
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}
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// Initialize bounce cache with LRU (least recently used) caching
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this.bounceCache = new LRUCache<string, any>({
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max: options?.maxCacheSize || 10000,
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ttl: options?.cacheTTL || 30 * 24 * 60 * 60 * 1000, // 30 days default
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});
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// Store storage manager reference
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this.storageManager = options?.storageManager;
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// Load suppression list from storage
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// Note: This is async but we can't await in constructor
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// The suppression list will be loaded asynchronously
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this.loadSuppressionList().catch(error => {
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logger.log('error', `Failed to load suppression list on startup: ${error.message}`);
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});
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}
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/**
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* Process a bounce notification
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* @param bounceData Bounce data to process
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* @returns Processed bounce record
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*/
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public async processBounce(bounceData: Partial<BounceRecord>): Promise<BounceRecord> {
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try {
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// Add required fields if missing
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const bounce: BounceRecord = {
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id: bounceData.id || plugins.uuid.v4(),
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recipient: bounceData.recipient,
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sender: bounceData.sender,
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domain: bounceData.domain || bounceData.recipient.split('@')[1],
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subject: bounceData.subject,
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bounceType: bounceData.bounceType || BounceType.UNKNOWN,
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bounceCategory: bounceData.bounceCategory || BounceCategory.UNKNOWN,
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timestamp: bounceData.timestamp || Date.now(),
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smtpResponse: bounceData.smtpResponse,
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diagnosticCode: bounceData.diagnosticCode,
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statusCode: bounceData.statusCode,
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headers: bounceData.headers,
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processed: false,
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originalEmailId: bounceData.originalEmailId,
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retryCount: bounceData.retryCount || 0,
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nextRetryTime: bounceData.nextRetryTime
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};
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// Determine bounce type and category via Rust bridge if not provided
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if (!bounceData.bounceType || bounceData.bounceType === BounceType.UNKNOWN) {
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const bridge = RustSecurityBridge.getInstance();
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const rustResult = await bridge.detectBounce({
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smtpResponse: bounce.smtpResponse,
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diagnosticCode: bounce.diagnosticCode,
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statusCode: bounce.statusCode,
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});
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bounce.bounceType = rustResult.bounce_type as BounceType;
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bounce.bounceCategory = rustResult.category as BounceCategory;
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}
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// Process the bounce based on category
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switch (bounce.bounceCategory) {
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case BounceCategory.HARD:
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// Handle hard bounce - add to suppression list
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await this.handleHardBounce(bounce);
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break;
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case BounceCategory.SOFT:
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// Handle soft bounce - schedule retry if eligible
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await this.handleSoftBounce(bounce);
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break;
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case BounceCategory.AUTO_RESPONSE:
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// Handle auto-response - typically no action needed
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logger.log('info', `Auto-response detected for ${bounce.recipient}`);
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break;
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default:
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// Unknown bounce type - log for investigation
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logger.log('warn', `Unknown bounce type for ${bounce.recipient}`, {
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bounceType: bounce.bounceType,
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smtpResponse: bounce.smtpResponse
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});
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break;
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}
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// Store the bounce record
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bounce.processed = true;
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this.bounceStore.push(bounce);
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// Update the bounce cache
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this.updateBounceCache(bounce);
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// Log the bounce
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logger.log(
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bounce.bounceCategory === BounceCategory.HARD ? 'warn' : 'info',
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`Email bounce processed: ${bounce.bounceCategory} bounce for ${bounce.recipient}`,
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{
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bounceType: bounce.bounceType,
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domain: bounce.domain,
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category: bounce.bounceCategory
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}
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);
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// Enhanced security logging
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SecurityLogger.getInstance().logEvent({
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level: bounce.bounceCategory === BounceCategory.HARD
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? SecurityLogLevel.WARN
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: SecurityLogLevel.INFO,
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type: SecurityEventType.EMAIL_VALIDATION,
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message: `Email bounce detected: ${bounce.bounceCategory} bounce for recipient`,
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domain: bounce.domain,
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details: {
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recipient: bounce.recipient,
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bounceType: bounce.bounceType,
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smtpResponse: bounce.smtpResponse,
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diagnosticCode: bounce.diagnosticCode,
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statusCode: bounce.statusCode
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},
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success: false
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});
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return bounce;
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} catch (error) {
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logger.log('error', `Error processing bounce: ${error.message}`, {
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error: error.message,
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bounceData
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});
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throw error;
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}
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}
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/**
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* Process an SMTP failure as a bounce
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* @param recipient Recipient email
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* @param smtpResponse SMTP error response
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* @param options Additional options
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* @returns Processed bounce record
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*/
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public async processSmtpFailure(
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recipient: string,
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smtpResponse: string,
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options: {
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sender?: string;
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originalEmailId?: string;
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statusCode?: string;
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headers?: Record<string, string>;
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} = {}
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): Promise<BounceRecord> {
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// Create bounce data from SMTP failure
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const bounceData: Partial<BounceRecord> = {
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recipient,
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sender: options.sender || '',
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domain: recipient.split('@')[1],
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smtpResponse,
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statusCode: options.statusCode,
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headers: options.headers,
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originalEmailId: options.originalEmailId,
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timestamp: Date.now()
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};
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// Process as a regular bounce
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return this.processBounce(bounceData);
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}
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/**
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* Process a bounce notification email
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* @param bounceEmail The email containing bounce information
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* @returns Processed bounce record or null if not a bounce
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*/
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public async processBounceEmail(bounceEmail: Email): Promise<BounceRecord | null> {
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try {
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// Check if this is a bounce notification
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const subject = bounceEmail.getSubject();
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const body = bounceEmail.getBody();
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// Check for common bounce notification subject patterns
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const isBounceSubject = /mail delivery|delivery (failed|status|notification)|failure notice|returned mail|undeliverable|delivery problem/i.test(subject);
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if (!isBounceSubject) {
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// Not a bounce notification based on subject
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return null;
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}
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// Extract original recipient from the body or headers
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let recipient = '';
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let originalMessageId = '';
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// Extract recipient from common bounce formats
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const recipientMatch = body.match(/(?:failed recipient|to[:=]\s*|recipient:|delivery failed:)\s*<?([a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,})>?/i);
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if (recipientMatch && recipientMatch[1]) {
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recipient = recipientMatch[1];
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}
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// Extract diagnostic code
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let diagnosticCode = '';
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const diagnosticMatch = body.match(/diagnostic(?:-|\\s+)code:\s*(.+)(?:\n|$)/i);
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if (diagnosticMatch && diagnosticMatch[1]) {
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diagnosticCode = diagnosticMatch[1].trim();
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}
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// Extract SMTP status code
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let statusCode = '';
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const statusMatch = body.match(/status(?:-|\\s+)code:\s*([0-9.]+)/i);
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if (statusMatch && statusMatch[1]) {
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statusCode = statusMatch[1].trim();
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}
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// If recipient not found in standard patterns, try DSN (Delivery Status Notification) format
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if (!recipient) {
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// Look for DSN format with Original-Recipient or Final-Recipient fields
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const originalRecipientMatch = body.match(/original-recipient:.*?([a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,})/i);
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const finalRecipientMatch = body.match(/final-recipient:.*?([a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,})/i);
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if (originalRecipientMatch && originalRecipientMatch[1]) {
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recipient = originalRecipientMatch[1];
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} else if (finalRecipientMatch && finalRecipientMatch[1]) {
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recipient = finalRecipientMatch[1];
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}
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}
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// If still no recipient, can't process as bounce
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if (!recipient) {
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logger.log('warn', 'Could not extract recipient from bounce notification', {
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subject,
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sender: bounceEmail.from
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});
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return null;
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}
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// Extract original message ID if available
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const messageIdMatch = body.match(/original[ -]message[ -]id:[ \t]*<?([^>]+)>?/i);
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if (messageIdMatch && messageIdMatch[1]) {
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originalMessageId = messageIdMatch[1].trim();
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}
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// Create bounce data
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const bounceData: Partial<BounceRecord> = {
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recipient,
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sender: bounceEmail.from,
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domain: recipient.split('@')[1],
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subject: bounceEmail.getSubject(),
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diagnosticCode,
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statusCode,
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timestamp: Date.now(),
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headers: {}
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};
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// Process as a regular bounce
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return this.processBounce(bounceData);
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} catch (error) {
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logger.log('error', `Error processing bounce email: ${error.message}`);
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return null;
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}
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}
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/**
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* Handle a hard bounce by adding to suppression list
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* @param bounce The bounce record
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*/
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private async handleHardBounce(bounce: BounceRecord): Promise<void> {
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// Add to suppression list permanently (no expiry)
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this.addToSuppressionList(bounce.recipient, `Hard bounce: ${bounce.bounceType}`, undefined);
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// Increment bounce count in cache
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this.updateBounceCache(bounce);
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// Save to permanent storage
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await this.saveBounceRecord(bounce);
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// Log hard bounce for monitoring
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logger.log('warn', `Hard bounce for ${bounce.recipient}: ${bounce.bounceType}`, {
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domain: bounce.domain,
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smtpResponse: bounce.smtpResponse,
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diagnosticCode: bounce.diagnosticCode
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});
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}
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/**
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* Handle a soft bounce by scheduling a retry if eligible
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* @param bounce The bounce record
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*/
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private async handleSoftBounce(bounce: BounceRecord): Promise<void> {
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// Check if we've exceeded max retries
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if (bounce.retryCount >= this.retryStrategy.maxRetries) {
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logger.log('warn', `Max retries exceeded for ${bounce.recipient}, treating as hard bounce`);
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// Convert to hard bounce after max retries
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bounce.bounceCategory = BounceCategory.HARD;
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await this.handleHardBounce(bounce);
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return;
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}
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// Calculate next retry time with exponential backoff
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const delay = Math.min(
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this.retryStrategy.initialDelay * Math.pow(this.retryStrategy.backoffFactor, bounce.retryCount),
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this.retryStrategy.maxDelay
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);
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bounce.retryCount++;
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bounce.nextRetryTime = Date.now() + delay;
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// Add to suppression list temporarily (with expiry)
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this.addToSuppressionList(
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bounce.recipient,
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`Soft bounce: ${bounce.bounceType}`,
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bounce.nextRetryTime
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);
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// Log the retry schedule
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logger.log('info', `Scheduled retry ${bounce.retryCount} for ${bounce.recipient} at ${new Date(bounce.nextRetryTime).toISOString()}`, {
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bounceType: bounce.bounceType,
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retryCount: bounce.retryCount,
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nextRetry: bounce.nextRetryTime
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});
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}
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/**
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* Add an email address to the suppression list
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* @param email Email address to suppress
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* @param reason Reason for suppression
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* @param expiresAt Expiration timestamp (undefined for permanent)
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*/
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public addToSuppressionList(
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email: string,
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reason: string,
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expiresAt?: number
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): void {
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this.suppressionList.set(email.toLowerCase(), {
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reason,
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timestamp: Date.now(),
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expiresAt
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});
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// Save asynchronously without blocking
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this.saveSuppressionList().catch(error => {
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logger.log('error', `Failed to save suppression list after adding ${email}: ${error.message}`);
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});
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logger.log('info', `Added ${email} to suppression list`, {
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reason,
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expiresAt: expiresAt ? new Date(expiresAt).toISOString() : 'permanent'
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});
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}
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/**
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* Remove an email address from the suppression list
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* @param email Email address to remove
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*/
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public removeFromSuppressionList(email: string): void {
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const wasRemoved = this.suppressionList.delete(email.toLowerCase());
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|
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if (wasRemoved) {
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// Save asynchronously without blocking
|
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this.saveSuppressionList().catch(error => {
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logger.log('error', `Failed to save suppression list after removing ${email}: ${error.message}`);
|
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});
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logger.log('info', `Removed ${email} from suppression list`);
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}
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}
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|
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/**
|
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* Check if an email is on the suppression list
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* @param email Email address to check
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* @returns Whether the email is suppressed
|
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*/
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public isEmailSuppressed(email: string): boolean {
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const lowercaseEmail = email.toLowerCase();
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const suppression = this.suppressionList.get(lowercaseEmail);
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if (!suppression) {
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return false;
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}
|
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|
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// Check if suppression has expired
|
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if (suppression.expiresAt && Date.now() > suppression.expiresAt) {
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this.suppressionList.delete(lowercaseEmail);
|
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// Save asynchronously without blocking
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this.saveSuppressionList().catch(error => {
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logger.log('error', `Failed to save suppression list after expiry cleanup: ${error.message}`);
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});
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return false;
|
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}
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return true;
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}
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|
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/**
|
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* Get suppression information for an email
|
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* @param email Email address to check
|
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* @returns Suppression information or null if not suppressed
|
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*/
|
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public getSuppressionInfo(email: string): {
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reason: string;
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timestamp: number;
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expiresAt?: number;
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} | null {
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const lowercaseEmail = email.toLowerCase();
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const suppression = this.suppressionList.get(lowercaseEmail);
|
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if (!suppression) {
|
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return null;
|
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}
|
|
|
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// Check if suppression has expired
|
|
if (suppression.expiresAt && Date.now() > suppression.expiresAt) {
|
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this.suppressionList.delete(lowercaseEmail);
|
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// Save asynchronously without blocking
|
|
this.saveSuppressionList().catch(error => {
|
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logger.log('error', `Failed to save suppression list after expiry cleanup: ${error.message}`);
|
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});
|
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return null;
|
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}
|
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|
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return suppression;
|
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}
|
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|
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/**
|
|
* Save suppression list to disk
|
|
*/
|
|
private async saveSuppressionList(): Promise<void> {
|
|
try {
|
|
const suppressionData = JSON.stringify(Array.from(this.suppressionList.entries()));
|
|
|
|
if (this.storageManager) {
|
|
// Use storage manager
|
|
await this.storageManager.set('/email/bounces/suppression-list.json', suppressionData);
|
|
} else {
|
|
// Fall back to filesystem
|
|
await plugins.smartfs.file(
|
|
plugins.path.join(paths.dataDir, 'emails', 'suppression_list.json')
|
|
).write(suppressionData);
|
|
}
|
|
} catch (error) {
|
|
logger.log('error', `Failed to save suppression list: ${error.message}`);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Load suppression list from disk
|
|
*/
|
|
private async loadSuppressionList(): Promise<void> {
|
|
try {
|
|
let entries = null;
|
|
let needsMigration = false;
|
|
|
|
if (this.storageManager) {
|
|
// Try to load from storage manager first
|
|
const suppressionData = await this.storageManager.get('/email/bounces/suppression-list.json');
|
|
|
|
if (suppressionData) {
|
|
entries = JSON.parse(suppressionData);
|
|
} else {
|
|
// Check if data exists in filesystem and migrate
|
|
const suppressionPath = plugins.path.join(paths.dataDir, 'emails', 'suppression_list.json');
|
|
|
|
if (plugins.fs.existsSync(suppressionPath)) {
|
|
const data = plugins.fs.readFileSync(suppressionPath, 'utf8');
|
|
entries = JSON.parse(data);
|
|
needsMigration = true;
|
|
|
|
logger.log('info', 'Migrating suppression list from filesystem to StorageManager');
|
|
}
|
|
}
|
|
} else {
|
|
// No storage manager, use filesystem directly
|
|
const suppressionPath = plugins.path.join(paths.dataDir, 'emails', 'suppression_list.json');
|
|
|
|
if (plugins.fs.existsSync(suppressionPath)) {
|
|
const data = plugins.fs.readFileSync(suppressionPath, 'utf8');
|
|
entries = JSON.parse(data);
|
|
}
|
|
}
|
|
|
|
if (entries) {
|
|
this.suppressionList = new Map(entries);
|
|
|
|
// Clean expired entries
|
|
const now = Date.now();
|
|
let expiredCount = 0;
|
|
|
|
for (const [email, info] of this.suppressionList.entries()) {
|
|
if (info.expiresAt && now > info.expiresAt) {
|
|
this.suppressionList.delete(email);
|
|
expiredCount++;
|
|
}
|
|
}
|
|
|
|
if (expiredCount > 0 || needsMigration) {
|
|
logger.log('info', `Cleaned ${expiredCount} expired entries from suppression list`);
|
|
await this.saveSuppressionList();
|
|
}
|
|
|
|
logger.log('info', `Loaded ${this.suppressionList.size} entries from suppression list`);
|
|
}
|
|
} catch (error) {
|
|
logger.log('error', `Failed to load suppression list: ${error.message}`);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Save bounce record to disk
|
|
* @param bounce Bounce record to save
|
|
*/
|
|
private async saveBounceRecord(bounce: BounceRecord): Promise<void> {
|
|
try {
|
|
const bounceData = JSON.stringify(bounce, null, 2);
|
|
|
|
if (this.storageManager) {
|
|
// Use storage manager
|
|
await this.storageManager.set(`/email/bounces/records/${bounce.id}.json`, bounceData);
|
|
} else {
|
|
// Fall back to filesystem
|
|
const bouncePath = plugins.path.join(
|
|
paths.dataDir,
|
|
'emails',
|
|
'bounces',
|
|
`${bounce.id}.json`
|
|
);
|
|
|
|
// Ensure directory exists
|
|
const bounceDir = plugins.path.join(paths.dataDir, 'emails', 'bounces');
|
|
await plugins.smartfs.directory(bounceDir).recursive().create();
|
|
|
|
await plugins.smartfs.file(bouncePath).write(bounceData);
|
|
}
|
|
} catch (error) {
|
|
logger.log('error', `Failed to save bounce record: ${error.message}`);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Update bounce cache with new bounce information
|
|
* @param bounce Bounce record to update cache with
|
|
*/
|
|
private updateBounceCache(bounce: BounceRecord): void {
|
|
const email = bounce.recipient.toLowerCase();
|
|
const existing = this.bounceCache.get(email);
|
|
|
|
if (existing) {
|
|
// Update existing cache entry
|
|
existing.lastBounce = bounce.timestamp;
|
|
existing.count++;
|
|
existing.type = bounce.bounceType;
|
|
existing.category = bounce.bounceCategory;
|
|
} else {
|
|
// Create new cache entry
|
|
this.bounceCache.set(email, {
|
|
lastBounce: bounce.timestamp,
|
|
count: 1,
|
|
type: bounce.bounceType,
|
|
category: bounce.bounceCategory
|
|
});
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Check bounce history for an email address
|
|
* @param email Email address to check
|
|
* @returns Bounce information or null if no bounces
|
|
*/
|
|
public getBounceInfo(email: string): {
|
|
lastBounce: number;
|
|
count: number;
|
|
type: BounceType;
|
|
category: BounceCategory;
|
|
} | null {
|
|
return this.bounceCache.get(email.toLowerCase()) || null;
|
|
}
|
|
|
|
/**
|
|
* Get all known hard bounced addresses
|
|
* @returns Array of hard bounced email addresses
|
|
*/
|
|
public getHardBouncedAddresses(): string[] {
|
|
const hardBounced: string[] = [];
|
|
|
|
for (const [email, info] of this.bounceCache.entries()) {
|
|
if (info.category === BounceCategory.HARD) {
|
|
hardBounced.push(email);
|
|
}
|
|
}
|
|
|
|
return hardBounced;
|
|
}
|
|
|
|
/**
|
|
* Get suppression list
|
|
* @returns Array of suppressed email addresses
|
|
*/
|
|
public getSuppressionList(): string[] {
|
|
return Array.from(this.suppressionList.keys());
|
|
}
|
|
|
|
/**
|
|
* Clear old bounce records (for maintenance)
|
|
* @param olderThan Timestamp to remove records older than
|
|
* @returns Number of records removed
|
|
*/
|
|
public clearOldBounceRecords(olderThan: number): number {
|
|
let removed = 0;
|
|
|
|
this.bounceStore = this.bounceStore.filter(bounce => {
|
|
if (bounce.timestamp < olderThan) {
|
|
removed++;
|
|
return false;
|
|
}
|
|
return true;
|
|
});
|
|
|
|
return removed;
|
|
}
|
|
} |