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index.js
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index.js
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'use strict'
const MqttClient = require('../client')
const Store = require('../store')
const url = require('url')
const xtend = require('xtend')
const debug = require('debug')('mqttjs')
const protocols = {}
// eslint-disable-next-line camelcase
if ((typeof process !== 'undefined' && process.title !== 'browser') || typeof __webpack_require__ !== 'function') {
protocols.mqtt = require('./tcp')
protocols.tcp = require('./tcp')
protocols.ssl = require('./tls')
protocols.tls = require('./tls')
protocols.mqtts = require('./tls')
} else {
protocols.wx = require('./wx')
protocols.wxs = require('./wx')
protocols.ali = require('./ali')
protocols.alis = require('./ali')
}
protocols.ws = require('./ws')
protocols.wss = require('./ws')
/**
* Parse the auth attribute and merge username and password in the options object.
*
* @param {Object} [opts] option object
*/
function parseAuthOptions (opts) {
let matches
if (opts.auth) {
matches = opts.auth.match(/^(.+):(.+)$/)
if (matches) {
opts.username = matches[1]
opts.password = matches[2]
} else {
opts.username = opts.auth
}
}
}
/**
* connect - connect to an MQTT broker.
*
* @param {String} [brokerUrl] - url of the broker, optional
* @param {Object} opts - see MqttClient#constructor
*/
function connect (brokerUrl, opts) {
debug('connecting to an MQTT broker...')
if ((typeof brokerUrl === 'object') && !opts) {
opts = brokerUrl
brokerUrl = null
}
opts = opts || {}
if (brokerUrl) {
// eslint-disable-next-line
const parsed = url.parse(brokerUrl, true)
if (parsed.port != null) {
parsed.port = Number(parsed.port)
}
opts = xtend(parsed, opts)
if (opts.protocol === null) {
throw new Error('Missing protocol')
}
opts.protocol = opts.protocol.replace(/:$/, '')
}
// merge in the auth options if supplied
parseAuthOptions(opts)
// support clientId passed in the query string of the url
if (opts.query && typeof opts.query.clientId === 'string') {
opts.clientId = opts.query.clientId
}
if (opts.cert && opts.key) {
if (opts.protocol) {
if (['mqtts', 'wss', 'wxs', 'alis'].indexOf(opts.protocol) === -1) {
switch (opts.protocol) {
case 'mqtt':
opts.protocol = 'mqtts'
break
case 'ws':
opts.protocol = 'wss'
break
case 'wx':
opts.protocol = 'wxs'
break
case 'ali':
opts.protocol = 'alis'
break
default:
throw new Error('Unknown protocol for secure connection: "' + opts.protocol + '"!')
}
}
} else {
// A cert and key was provided, however no protocol was specified, so we will throw an error.
throw new Error('Missing secure protocol key')
}
}
if (!protocols[opts.protocol]) {
const isSecure = ['mqtts', 'wss'].indexOf(opts.protocol) !== -1
opts.protocol = [
'mqtt',
'mqtts',
'ws',
'wss',
'wx',
'wxs',
'ali',
'alis'
].filter(function (key, index) {
if (isSecure && index % 2 === 0) {
// Skip insecure protocols when requesting a secure one.
return false
}
return (typeof protocols[key] === 'function')
})[0]
}
if (opts.clean === false && !opts.clientId) {
throw new Error('Missing clientId for unclean clients')
}
if (opts.protocol) {
opts.defaultProtocol = opts.protocol
}
function wrapper (client) {
if (opts.servers) {
if (!client._reconnectCount || client._reconnectCount === opts.servers.length) {
client._reconnectCount = 0
}
opts.host = opts.servers[client._reconnectCount].host
opts.port = opts.servers[client._reconnectCount].port
opts.protocol = (!opts.servers[client._reconnectCount].protocol ? opts.defaultProtocol : opts.servers[client._reconnectCount].protocol)
opts.hostname = opts.host
client._reconnectCount++
}
debug('calling streambuilder for', opts.protocol)
return protocols[opts.protocol](client, opts)
}
const client = new MqttClient(wrapper, opts)
client.on('error', function () { /* Automatically set up client error handling */ })
return client
}
module.exports = connect
module.exports.connect = connect
module.exports.MqttClient = MqttClient
module.exports.Store = Store