feat: add quic support

Ref: #1298
Fixes #1924

src/lib/connect/index.ts

@@ -109,7 +109,11 @@ function connect(
 
 	if (opts.cert && opts.key) {
 		if (opts.protocol) {
-			if (['mqtts', 'wss', 'wxs', 'alis'].indexOf(opts.protocol) === -1) {
+			if (
+				['mqtts', 'wss', 'wxs', 'alis', 'quic'].indexOf(
+					opts.protocol,
+				) === -1
+			) {
 				switch (opts.protocol) {
 					case 'mqtt':
 						opts.protocol = 'mqtts'
@@ -147,6 +151,8 @@ function connect(
 			protocols.ssl = require('./tls').default
 			protocols.tls = protocols.ssl
 			protocols.mqtts = require('./tls').default
+
+			protocols.quic = require('./quic').default
 		} else {
 			protocols.ws = require('./ws').browserStreamBuilder
 			protocols.wss = require('./ws').browserStreamBuilder

src/lib/connect/quic.ts

@@ -0,0 +1,61 @@
+import { StreamBuilder } from '../shared'
+import _debug from 'debug'
+import { createSocket } from 'node:quic'
+
+const debug = _debug('mqttjs:quic')
+
+const buildStream: StreamBuilder = (client, opts) => {
+	opts.port = opts.port || 8885
+	opts.host = opts.hostname || opts.host || 'localhost'
+	opts.servername = opts.host
+
+	opts.rejectUnauthorized = opts.rejectUnauthorized !== false
+
+	delete opts.path
+
+	debug(
+		'port %d host %s rejectUnauthorized %b',
+		opts.port,
+		opts.host,
+		opts.rejectUnauthorized,
+	)
+
+	const socket = createSocket({
+		client: {
+			alpn: opts.alpn || 'mqtt',
+		},
+	})
+
+	const req = socket.connect({
+		address: opts.host,
+		port: opts.port || 8885,
+		cert: opts.cert,
+		key: opts.key,
+		idleTimeout: 0, // disable timeout
+	})
+
+	const stream = req.openStream()
+
+	req.on('secure', (servername) => {
+		// servername is checked for any string for authorisation acceptance
+		if (opts.rejectUnauthorized && !servername) {
+			req.emit('error', new Error('TLS not authorized'))
+		} else {
+			req.removeListener('error', handleTLSErrors)
+		}
+	})
+
+	function handleTLSErrors(err) {
+		if (opts.rejectUnauthorized) {
+			client.emit('error', err)
+		}
+
+		stream.end()
+		socket.close()
+	}
+
+	req.on('error', handleTLSErrors)
+	return stream
+}
+
+export default buildStream