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