148 lines
4.5 KiB
JavaScript
148 lines
4.5 KiB
JavaScript
'use strict';
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const { nodeifyFunction, nodeifyPromise } = require('../lib/nodeify');
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const log = require('../lib/log');
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const config = require('config');
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const {MailerError} = require('../lib/mailers');
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const campaigns = require('../models/campaigns');
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const contextHelpers = require('../lib/context-helpers');
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const {SubscriptionStatus} = require('../../shared/lists');
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const bluebird = require('bluebird');
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const BounceHandler = require('bounce-handler').BounceHandler;
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const SMTPServer = require('smtp-server').SMTPServer;
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async function onRcptTo(address, session) {
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const addrSplit = address.address.split('@');
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if (addrSplit.length !== 2) {
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throw new MailerError('Unknown user ' + address.address, 510);
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}
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const [user, host] = addrSplit;
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const message = await campaigns.getMessageByCid(user, true);
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if (!message) {
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throw new MailerError('Unknown user ' + address.address, 510);
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}
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if (message.verp_hostname !== host) {
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throw new MailerError('Unknown user ' + address.address, 510);
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}
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session.message = message;
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log.verbose('VERP', 'Incoming message for campaign:%s, list:%s, subscription:%s', message.campaign, message.list, message.subscription);
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}
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function onData(stream, session, callback) {
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let chunks = [];
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let totalLen = 0;
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const onStreamEnd = async () => {
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const body = Buffer.concat(chunks, totalLen).toString();
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const bh = new BounceHandler();
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let bounceResult;
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try {
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bounceResult = [].concat(bh.parse_email(body) || []).shift();
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} catch (err) {
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log.error('Bounce', 'Failed parsing bounce message');
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log.error('Bounce', JSON.stringify(body));
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}
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if (!bounceResult || ['failed', 'transient'].indexOf(bounceResult.action) < 0) {
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return 'Message accepted';
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} else {
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await campaigns.changeStatusByMessage(contextHelpers.getAdminContext(), session.message, SubscriptionStatus.BOUNCED, bounceResult.action === 'failed');
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log.verbose('VERP', 'Marked message (campaign:%s, list:%s, subscription:%s) as unsubscribed', session.message.campaign, session.message.list, session.message.subscription);
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}
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};
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stream.on('data', chunk => {
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if (!chunk || !chunk.length || totalLen > 60 * 1024) {
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return;
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}
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chunks.push(chunk);
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totalLen += chunk.length;
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});
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stream.on('end', () => nodeifyPromise(onStreamEnd(), callback));
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}
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// Setup server
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const server = new SMTPServer({
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// log to console
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logger: false,
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banner: 'Mailtrain VERP bouncer',
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disabledCommands: ['AUTH', 'STARTTLS'],
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onRcptTo: nodeifyFunction(onRcptTo),
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onData: onData
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});
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function start(callback) {
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if (!config.verp.enabled) {
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return setImmediate(callback);
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}
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let started = false;
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server.on('error', err => {
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const port = config.verp.port;
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const bind = typeof port === 'string' ? 'Pipe ' + port : 'Port ' + port;
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switch (err.code) {
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case 'EACCES':
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log.error('VERP', '%s requires elevated privileges', bind);
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break;
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case 'EADDRINUSE':
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log.error('VERP', '%s is already in use', bind);
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break;
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case 'ECONNRESET': // Usually happens when a client does not disconnect cleanly
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case 'EPIPE': // Remote connection was closed before the server attempted to send data
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default:
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log.error('VERP', err);
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}
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if (!started) {
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started = true;
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return callback(err);
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}
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});
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let hosts;
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if (typeof config.verp.host === 'string' && config.verp.host) {
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hosts = config.verp.host.trim().split(',').map(host => host.trim()).filter(host => !!host);
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if (hosts.indexOf('*') >= 0 || hosts.indexOf('all') >= 0) {
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hosts = [false];
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}
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} else {
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hosts = [false];
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}
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let pos = 0;
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const startNextHost = () => {
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if (pos >= hosts.length) {
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started = true;
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return setImmediate(callback);
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}
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const host = hosts[pos++];
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server.listen(config.verp.port, host, () => {
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if (started) {
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return server.close();
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}
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log.info('VERP', 'Server listening on %s:%s', host || '*', config.verp.port);
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setImmediate(startNextHost);
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});
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};
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startNextHost();
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}
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module.exports.start = bluebird.promisify(start);
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