feat: implement comprehensive route-based email routing system
Replace legacy domain-rule based routing with flexible route-based system that supports: - Multi-criteria matching (recipients, senders, IPs, authentication) - Four action types (forward, process, deliver, reject) - Moved DKIM signing to delivery phase for signature validity - Connection pooling for efficient email forwarding - Pattern caching for improved performance This provides more granular control over email routing with priority-based matching and comprehensive test coverage.
This commit is contained in:
@ -15,10 +15,8 @@ import {
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SenderReputationMonitor,
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type IReputationMonitorConfig
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} from '../../deliverability/index.js';
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import { DomainRouter } from './classes.domain.router.js';
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import type {
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IDomainRule
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} from './classes.email.config.js';
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import { EmailRouter } from './classes.email.router.js';
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import type { IEmailRoute, IEmailAction, IEmailContext } from './interfaces.js';
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import { Email } from '../core/classes.email.js';
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import { BounceManager, BounceType, BounceCategory } from '../core/classes.bouncemanager.js';
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import { createSmtpServer } from '../delivery/smtpserver/index.js';
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@ -32,13 +30,13 @@ import type { EmailProcessingMode, ISmtpSession as IBaseSmtpSession } from '../d
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import type { DcRouter } from '../../classes.dcrouter.js';
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/**
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* Extended SMTP session interface with domain rule information
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* Extended SMTP session interface with route information
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*/
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export interface IExtendedSmtpSession extends ISmtpSession {
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/**
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* Matched domain rule for this session
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* Matched route for this session
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*/
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matchedRule?: IDomainRule;
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matchedRoute?: IEmailRoute;
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}
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/**
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@ -77,14 +75,8 @@ export interface IUnifiedEmailServerOptions {
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connectionTimeout?: number;
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socketTimeout?: number;
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// Domain rules
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domainRules: IDomainRule[];
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// Default handling for unmatched domains
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defaultMode: EmailProcessingMode;
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defaultServer?: string;
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defaultPort?: number;
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defaultTls?: boolean;
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// Email routing rules
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routes: IEmailRoute[];
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// Outbound settings
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outbound?: {
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@ -124,9 +116,9 @@ export interface ISmtpSession extends IBaseSmtpSession {
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};
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/**
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* Matched domain rule for this session
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* Matched route for this session
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*/
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matchedRule?: IDomainRule;
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matchedRoute?: IEmailRoute;
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}
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/**
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@ -162,7 +154,7 @@ export interface IServerStats {
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export class UnifiedEmailServer extends EventEmitter {
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private dcRouter: DcRouter;
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private options: IUnifiedEmailServerOptions;
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private domainRouter: DomainRouter;
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private emailRouter: EmailRouter;
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private servers: any[] = [];
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private stats: IServerStats;
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@ -222,16 +214,8 @@ export class UnifiedEmailServer extends EventEmitter {
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domains: []
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});
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// Initialize domain router for pattern matching
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this.domainRouter = new DomainRouter({
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domainRules: options.domainRules,
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defaultMode: options.defaultMode,
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defaultServer: options.defaultServer,
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defaultPort: options.defaultPort,
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defaultTls: options.defaultTls,
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enableCache: true,
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cacheSize: 1000
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});
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// Initialize email router with routes
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this.emailRouter = new EmailRouter(options.routes || []);
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// Initialize rate limiter
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this.rateLimiter = new UnifiedRateLimiter(options.rateLimits || {
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@ -396,12 +380,7 @@ export class UnifiedEmailServer extends EventEmitter {
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applyPolicy: () => true
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},
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processIncomingEmail: async (email: Email) => {
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// This is where we'll process the email based on domain routing
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const to = email.to[0]; // Email.to is an array, take the first recipient
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const rule = this.domainRouter.matchRule(to);
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const mode = rule?.mode || this.options.defaultMode;
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// Process based on the mode
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// Process email using the new route-based system
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await this.processEmailByMode(email, {
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id: 'session-' + Math.random().toString(36).substring(2),
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state: SmtpState.FINISHED,
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@ -417,10 +396,8 @@ export class UnifiedEmailServer extends EventEmitter {
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envelope: {
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mailFrom: { address: email.from, args: {} },
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rcptTo: email.to.map(recipient => ({ address: recipient, args: {} }))
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},
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processingMode: mode,
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matchedRule: rule
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}, mode);
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}
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});
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return true;
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}
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@ -515,9 +492,9 @@ export class UnifiedEmailServer extends EventEmitter {
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/**
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* Process email based on the determined mode
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* Process email based on routing rules
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*/
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public async processEmailByMode(emailData: Email | Buffer, session: IExtendedSmtpSession, mode: EmailProcessingMode): Promise<Email> {
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public async processEmailByMode(emailData: Email | Buffer, session: IExtendedSmtpSession): Promise<Email> {
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// Convert Buffer to Email if needed
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let email: Email;
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if (Buffer.isBuffer(emailData)) {
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@ -563,38 +540,202 @@ export class UnifiedEmailServer extends EventEmitter {
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logger.log('info', 'Not a valid bounce notification, continuing with regular processing');
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}
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// Process based on mode
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switch (mode) {
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case 'forward':
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throw new Error('Forward mode is not implemented');
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case 'mta':
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await this.handleMtaMode(email, session);
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break;
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case 'process':
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await this.handleProcessMode(email, session);
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break;
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default:
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throw new Error(`Unknown processing mode: ${mode}`);
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// Find matching route
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const context: IEmailContext = { email, session };
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const route = await this.emailRouter.evaluateRoutes(context);
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if (!route) {
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// No matching route - reject
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throw new Error('No matching route for email');
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}
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// Store matched route in session
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session.matchedRoute = route;
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// Execute action based on route
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await this.executeAction(route.action, email, context);
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// Return the processed email
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return email;
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}
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/**
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* Execute action based on route configuration
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*/
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private async executeAction(action: IEmailAction, email: Email, context: IEmailContext): Promise<void> {
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switch (action.type) {
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case 'forward':
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await this.handleForwardAction(action, email, context);
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break;
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case 'process':
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await this.handleProcessAction(action, email, context);
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break;
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case 'deliver':
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await this.handleDeliverAction(action, email, context);
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break;
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case 'reject':
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await this.handleRejectAction(action, email, context);
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break;
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default:
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throw new Error(`Unknown action type: ${(action as any).type}`);
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}
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}
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/**
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* Handle forward action
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*/
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private async handleForwardAction(_action: IEmailAction, email: Email, context: IEmailContext): Promise<void> {
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if (!_action.forward) {
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throw new Error('Forward action requires forward configuration');
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}
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const { host, port = 25, auth, addHeaders } = _action.forward;
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logger.log('info', `Forwarding email to ${host}:${port}`);
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// Add forwarding headers
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if (addHeaders) {
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for (const [key, value] of Object.entries(addHeaders)) {
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email.headers[key] = value;
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}
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}
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// Add standard forwarding headers
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email.headers['X-Forwarded-For'] = context.session.remoteAddress || 'unknown';
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email.headers['X-Forwarded-To'] = email.to.join(', ');
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email.headers['X-Forwarded-Date'] = new Date().toISOString();
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// Get SMTP client
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const client = this.getSmtpClient(host, port);
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try {
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// Send email
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await client.sendMail(email);
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logger.log('info', `Successfully forwarded email to ${host}:${port}`);
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SecurityLogger.getInstance().logEvent({
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level: SecurityLogLevel.INFO,
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type: SecurityEventType.EMAIL_FORWARDING,
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message: 'Email forwarded successfully',
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ipAddress: context.session.remoteAddress,
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details: {
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sessionId: context.session.id,
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routeName: context.session.matchedRoute?.name,
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targetHost: host,
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targetPort: port,
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recipients: email.to
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},
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success: true
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});
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} catch (error) {
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logger.log('error', `Failed to forward email: ${error.message}`);
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SecurityLogger.getInstance().logEvent({
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level: SecurityLogLevel.ERROR,
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type: SecurityEventType.EMAIL_FORWARDING,
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message: 'Email forwarding failed',
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ipAddress: context.session.remoteAddress,
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details: {
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sessionId: context.session.id,
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routeName: context.session.matchedRoute?.name,
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targetHost: host,
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targetPort: port,
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error: error.message
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},
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success: false
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});
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// Handle as bounce
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for (const recipient of email.getAllRecipients()) {
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await this.bounceManager.processSmtpFailure(recipient, error.message, {
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sender: email.from,
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originalEmailId: email.headers['Message-ID'] as string
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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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/**
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* Handle process action
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*/
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private async handleProcessAction(action: IEmailAction, email: Email, context: IEmailContext): Promise<void> {
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logger.log('info', `Processing email with action options`);
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// Apply scanning if requested
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if (action.process?.scan) {
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// Use existing content scanner
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// Note: ContentScanner integration would go here
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logger.log('info', 'Content scanning requested');
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}
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// Note: DKIM signing will be applied at delivery time to ensure signature validity
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// Queue for delivery
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const queue = action.process?.queue || 'normal';
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await this.deliveryQueue.enqueue(email, 'process', context.session.matchedRoute!);
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logger.log('info', `Email queued for delivery in ${queue} queue`);
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}
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/**
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* Handle deliver action
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*/
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private async handleDeliverAction(_action: IEmailAction, email: Email, context: IEmailContext): Promise<void> {
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logger.log('info', `Delivering email locally`);
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// Queue for local delivery
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await this.deliveryQueue.enqueue(email, 'mta', context.session.matchedRoute!);
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logger.log('info', 'Email queued for local delivery');
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}
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/**
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* Handle reject action
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*/
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private async handleRejectAction(action: IEmailAction, email: Email, context: IEmailContext): Promise<void> {
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const code = action.reject?.code || 550;
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const message = action.reject?.message || 'Message rejected';
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logger.log('info', `Rejecting email with code ${code}: ${message}`);
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SecurityLogger.getInstance().logEvent({
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level: SecurityLogLevel.WARN,
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type: SecurityEventType.EMAIL_PROCESSING,
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message: 'Email rejected by routing rule',
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ipAddress: context.session.remoteAddress,
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details: {
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sessionId: context.session.id,
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routeName: context.session.matchedRoute?.name,
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rejectCode: code,
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rejectMessage: message,
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from: email.from,
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to: email.to
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},
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success: false
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});
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// Throw error with SMTP code and message
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const error = new Error(message);
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(error as any).responseCode = code;
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throw error;
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}
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/**
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* Handle email in MTA mode (programmatic processing)
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*/
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private async handleMtaMode(email: Email, session: IExtendedSmtpSession): Promise<void> {
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private async _handleMtaMode(email: Email, session: IExtendedSmtpSession): Promise<void> {
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logger.log('info', `Handling email in MTA mode for session ${session.id}`);
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try {
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// Apply MTA rule options if provided
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if (session.matchedRule?.mtaOptions) {
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const options = session.matchedRule.mtaOptions;
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if (session.matchedRoute?.action.options?.mtaOptions) {
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const options = session.matchedRoute.action.options.mtaOptions;
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// Apply DKIM signing if enabled
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if (options.dkimSign && options.dkimOptions) {
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@ -654,7 +795,7 @@ export class UnifiedEmailServer extends EventEmitter {
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ipAddress: session.remoteAddress,
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details: {
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sessionId: session.id,
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ruleName: session.matchedRule?.pattern || 'default',
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ruleName: session.matchedRoute?.name || 'default',
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subject,
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recipients
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},
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@ -670,7 +811,7 @@ export class UnifiedEmailServer extends EventEmitter {
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ipAddress: session.remoteAddress,
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details: {
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sessionId: session.id,
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ruleName: session.matchedRule?.pattern || 'default',
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ruleName: session.matchedRoute?.name || 'default',
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error: error.message
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},
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success: false
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@ -683,18 +824,18 @@ export class UnifiedEmailServer extends EventEmitter {
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/**
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* Handle email in process mode (store-and-forward with scanning)
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*/
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private async handleProcessMode(email: Email, session: IExtendedSmtpSession): Promise<void> {
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private async _handleProcessMode(email: Email, session: IExtendedSmtpSession): Promise<void> {
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logger.log('info', `Handling email in process mode for session ${session.id}`);
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try {
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const rule = session.matchedRule;
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const route = session.matchedRoute;
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// Apply content scanning if enabled
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if (rule?.contentScanning && rule.scanners && rule.scanners.length > 0) {
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if (route?.action.options?.contentScanning && route.action.options.scanners && route.action.options.scanners.length > 0) {
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logger.log('info', 'Performing content scanning');
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// Apply each scanner
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for (const scanner of rule.scanners) {
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for (const scanner of route.action.options.scanners) {
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switch (scanner.type) {
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case 'spam':
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logger.log('info', 'Scanning for spam content');
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@ -728,10 +869,10 @@ export class UnifiedEmailServer extends EventEmitter {
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}
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// Apply transformations if defined
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if (rule?.transformations && rule.transformations.length > 0) {
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if (route?.action.options?.transformations && route.action.options.transformations.length > 0) {
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logger.log('info', 'Applying email transformations');
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for (const transform of rule.transformations) {
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for (const transform of route.action.options.transformations) {
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switch (transform.type) {
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case 'addHeader':
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if (transform.header && transform.value) {
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@ -751,8 +892,8 @@ export class UnifiedEmailServer extends EventEmitter {
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ipAddress: session.remoteAddress,
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details: {
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sessionId: session.id,
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ruleName: rule?.pattern || 'default',
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contentScanning: rule?.contentScanning || false,
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ruleName: route?.name || 'default',
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contentScanning: route?.action.options?.contentScanning || false,
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subject: email.subject
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},
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success: true
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@ -767,7 +908,7 @@ export class UnifiedEmailServer extends EventEmitter {
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ipAddress: session.remoteAddress,
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details: {
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sessionId: session.id,
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ruleName: session.matchedRule?.pattern || 'default',
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ruleName: session.matchedRoute?.name || 'default',
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error: error.message
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},
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success: false
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@ -921,19 +1062,19 @@ export class UnifiedEmailServer extends EventEmitter {
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// Update options without restart
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this.options = { ...this.options, ...options };
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// Update domain router if rules changed
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if (options.domainRules) {
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this.domainRouter.updateRules(options.domainRules);
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// Update email router if routes changed
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if (options.routes) {
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this.emailRouter.updateRoutes(options.routes);
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}
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}
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}
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/**
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* Update domain rules
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* Update email routes
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*/
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public updateDomainRules(rules: IDomainRule[]): void {
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this.options.domainRules = rules;
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this.domainRouter.updateRules(rules);
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public updateEmailRoutes(routes: IEmailRoute[]): void {
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this.options.routes = routes;
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this.emailRouter.updateRoutes(routes);
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}
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/**
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@ -943,6 +1084,14 @@ export class UnifiedEmailServer extends EventEmitter {
|
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return { ...this.stats };
|
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}
|
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|
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/**
|
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* Update email routes dynamically
|
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*/
|
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public updateRoutes(routes: IEmailRoute[]): void {
|
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this.emailRouter.setRoutes(routes);
|
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logger.log('info', `Updated email routes with ${routes.length} routes`);
|
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}
|
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|
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/**
|
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* Send an email through the delivery system
|
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* @param email The email to send
|
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@ -954,7 +1103,7 @@ export class UnifiedEmailServer extends EventEmitter {
|
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public async sendEmail(
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email: Email,
|
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mode: EmailProcessingMode = 'mta',
|
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rule?: IDomainRule,
|
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route?: IEmailRoute,
|
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options?: {
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||||
skipSuppressionCheck?: boolean;
|
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ipAddress?: string;
|
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@ -1040,16 +1189,16 @@ export class UnifiedEmailServer extends EventEmitter {
|
||||
}
|
||||
|
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// Check if the sender domain has DKIM keys and sign the email if needed
|
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if (mode === 'mta' && rule?.mtaOptions?.dkimSign) {
|
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if (mode === 'mta' && route?.action.options?.mtaOptions?.dkimSign) {
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const domain = email.from.split('@')[1];
|
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await this.handleDkimSigning(email, domain, rule.mtaOptions.dkimOptions?.keySelector || 'mta');
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await this.handleDkimSigning(email, domain, route.action.options.mtaOptions.dkimOptions?.keySelector || 'mta');
|
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}
|
||||
|
||||
// Generate a unique ID for this email
|
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const id = plugins.uuid.v4();
|
||||
|
||||
// Queue the email for delivery
|
||||
await this.deliveryQueue.enqueue(email, mode, rule);
|
||||
await this.deliveryQueue.enqueue(email, mode, route);
|
||||
|
||||
// Record 'sent' event for domain reputation monitoring
|
||||
const senderDomain = email.from.split('@')[1];
|
||||
|
||||
Reference in New Issue
Block a user