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const bl = require('bl')
const { EventEmitter } = require('events')
const Packet = require('./packet')
const constants = require('./constants')
const debug = require('debug')('mqtt-packet:parser')
class Parser extends EventEmitter {
constructor () {
super()
this.parser = this.constructor.parser
}
static parser (opt) {
if (!(this instanceof Parser)) return (new Parser()).parser(opt)
this.settings = opt || {}
this._states = [
'_parseHeader',
'_parseLength',
'_parsePayload',
'_newPacket'
]
this._resetState()
return this
}
_resetState () {
debug('_resetState: resetting packet, error, _list, and _stateCounter')
this.packet = new Packet()
this.error = null
this._list = bl()
this._stateCounter = 0
}
parse (buf) {
if (this.error) this._resetState()
this._list.append(buf)
debug('parse: current state: %s', this._states[this._stateCounter])
while ((this.packet.length !== -1 || this._list.length > 0) &&
this[this._states[this._stateCounter]]() &&
!this.error) {
this._stateCounter++
debug('parse: state complete. _stateCounter is now: %d', this._stateCounter)
debug('parse: packet.length: %d, buffer list length: %d', this.packet.length, this._list.length)
if (this._stateCounter >= this._states.length) this._stateCounter = 0
}
debug('parse: exited while loop. packet: %d, buffer list length: %d', this.packet.length, this._list.length)
return this._list.length
}
_parseHeader () {
// There is at least one byte in the buffer
const zero = this._list.readUInt8(0)
const cmdIndex = zero >> constants.CMD_SHIFT
this.packet.cmd = constants.types[cmdIndex]
const headerFlags = zero & 0xf
const requiredHeaderFlags = constants.requiredHeaderFlags[cmdIndex]
if (requiredHeaderFlags != null && headerFlags !== requiredHeaderFlags) {
// Where a flag bit is marked as “Reserved” in Table 2.2 - Flag Bits, it is reserved for future use and MUST be set to the value listed in that table [MQTT-2.2.2-1]. If invalid flags are received, the receiver MUST close the Network Connection [MQTT-2.2.2-2]
return this._emitError(new Error(constants.requiredHeaderFlagsErrors[cmdIndex]))
}
this.packet.retain = (zero & constants.RETAIN_MASK) !== 0
this.packet.qos = (zero >> constants.QOS_SHIFT) & constants.QOS_MASK
if (this.packet.qos > 2) {
return this._emitError(new Error('Packet must not have both QoS bits set to 1'))
}
this.packet.dup = (zero & constants.DUP_MASK) !== 0
debug('_parseHeader: packet: %o', this.packet)
this._list.consume(1)
return true
}
_parseLength () {
// There is at least one byte in the list
const result = this._parseVarByteNum(true)
if (result) {
this.packet.length = result.value
this._list.consume(result.bytes)
}
debug('_parseLength %d', result.value)
return !!result
}
_parsePayload () {
debug('_parsePayload: payload %O', this._list)
let result = false
// Do we have a payload? Do we have enough data to complete the payload?
// PINGs have no payload
if (this.packet.length === 0 || this._list.length >= this.packet.length) {
this._pos = 0
switch (this.packet.cmd) {
case 'connect':
this._parseConnect()
break
case 'connack':
this._parseConnack()
break
case 'publish':
this._parsePublish()
break
case 'puback':
case 'pubrec':
case 'pubrel':
case 'pubcomp':
this._parseConfirmation()
break
case 'subscribe':
this._parseSubscribe()
break
case 'suback':
this._parseSuback()
break
case 'unsubscribe':
this._parseUnsubscribe()
break
case 'unsuback':
this._parseUnsuback()
break
case 'pingreq':
case 'pingresp':
// These are empty, nothing to do
break
case 'disconnect':
this._parseDisconnect()
break
case 'auth':
this._parseAuth()
break
default:
this._emitError(new Error('Not supported'))
}
result = true
}
debug('_parsePayload complete result: %s', result)
return result
}
_parseConnect () {
debug('_parseConnect')
let topic // Will topic
let payload // Will payload
let password // Password
let username // Username
const flags = {}
const packet = this.packet
// Parse protocolId
const protocolId = this._parseString()
if (protocolId === null) return this._emitError(new Error('Cannot parse protocolId'))
if (protocolId !== 'MQTT' && protocolId !== 'MQIsdp') {
return this._emitError(new Error('Invalid protocolId'))
}
packet.protocolId = protocolId
// Parse constants version number
if (this._pos >= this._list.length) return this._emitError(new Error('Packet too short'))
packet.protocolVersion = this._list.readUInt8(this._pos)
if (packet.protocolVersion >= 128) {
packet.bridgeMode = true
packet.protocolVersion = packet.protocolVersion - 128
}
if (packet.protocolVersion !== 3 && packet.protocolVersion !== 4 && packet.protocolVersion !== 5) {
return this._emitError(new Error('Invalid protocol version'))
}
this._pos++
if (this._pos >= this._list.length) {
return this._emitError(new Error('Packet too short'))
}
if (this._list.readUInt8(this._pos) & 0x1) {
// The Server MUST validate that the reserved flag in the CONNECT Control Packet is set to zero and disconnect the Client if it is not zero [MQTT-3.1.2-3]
return this._emitError(new Error('Connect flag bit 0 must be 0, but got 1'))
}
// Parse connect flags
flags.username = (this._list.readUInt8(this._pos) & constants.USERNAME_MASK)
flags.password = (this._list.readUInt8(this._pos) & constants.PASSWORD_MASK)
flags.will = (this._list.readUInt8(this._pos) & constants.WILL_FLAG_MASK)
const willRetain = !!(this._list.readUInt8(this._pos) & constants.WILL_RETAIN_MASK)
const willQos = (this._list.readUInt8(this._pos) &
constants.WILL_QOS_MASK) >> constants.WILL_QOS_SHIFT
if (flags.will) {
packet.will = {}
packet.will.retain = willRetain
packet.will.qos = willQos
} else {
if (willRetain) {
return this._emitError(new Error('Will Retain Flag must be set to zero when Will Flag is set to 0'))
}
if (willQos) {
return this._emitError(new Error('Will QoS must be set to zero when Will Flag is set to 0'))
}
}
packet.clean = (this._list.readUInt8(this._pos) & constants.CLEAN_SESSION_MASK) !== 0
this._pos++
// Parse keepalive
packet.keepalive = this._parseNum()
if (packet.keepalive === -1) return this._emitError(new Error('Packet too short'))
// parse properties
if (packet.protocolVersion === 5) {
const properties = this._parseProperties()
if (Object.getOwnPropertyNames(properties).length) {
packet.properties = properties
}
}
// Parse clientId
const clientId = this._parseString()
if (clientId === null) return this._emitError(new Error('Packet too short'))
packet.clientId = clientId
debug('_parseConnect: packet.clientId: %s', packet.clientId)
if (flags.will) {
if (packet.protocolVersion === 5) {
const willProperties = this._parseProperties()
if (Object.getOwnPropertyNames(willProperties).length) {
packet.will.properties = willProperties
}
}
// Parse will topic
topic = this._parseString()
if (topic === null) return this._emitError(new Error('Cannot parse will topic'))
packet.will.topic = topic
debug('_parseConnect: packet.will.topic: %s', packet.will.topic)
// Parse will payload
payload = this._parseBuffer()
if (payload === null) return this._emitError(new Error('Cannot parse will payload'))
packet.will.payload = payload
debug('_parseConnect: packet.will.paylaod: %s', packet.will.payload)
}
// Parse username
if (flags.username) {
username = this._parseString()
if (username === null) return this._emitError(new Error('Cannot parse username'))
packet.username = username
debug('_parseConnect: packet.username: %s', packet.username)
}
// Parse password
if (flags.password) {
password = this._parseBuffer()
if (password === null) return this._emitError(new Error('Cannot parse password'))
packet.password = password
}
// need for right parse auth packet and self set up
this.settings = packet
debug('_parseConnect: complete')
return packet
}
_parseConnack () {
debug('_parseConnack')
const packet = this.packet
if (this._list.length < 1) return null
const flags = this._list.readUInt8(this._pos++)
if (flags > 1) {
return this._emitError(new Error('Invalid connack flags, bits 7-1 must be set to 0'))
}
packet.sessionPresent = !!(flags & constants.SESSIONPRESENT_MASK)
if (this.settings.protocolVersion === 5) {
if (this._list.length >= 2) {
packet.reasonCode = this._list.readUInt8(this._pos++)
} else {
packet.reasonCode = 0
}
} else {
if (this._list.length < 2) return null
packet.returnCode = this._list.readUInt8(this._pos++)
}
if (packet.returnCode === -1 || packet.reasonCode === -1) return this._emitError(new Error('Cannot parse return code'))
// mqtt 5 properties
if (this.settings.protocolVersion === 5) {
const properties = this._parseProperties()
if (Object.getOwnPropertyNames(properties).length) {
packet.properties = properties
}
}
debug('_parseConnack: complete')
}
_parsePublish () {
debug('_parsePublish')
const packet = this.packet
packet.topic = this._parseString()
if (packet.topic === null) return this._emitError(new Error('Cannot parse topic'))
// Parse messageId
if (packet.qos > 0) if (!this._parseMessageId()) { return }
// Properties mqtt 5
if (this.settings.protocolVersion === 5) {
const properties = this._parseProperties()
if (Object.getOwnPropertyNames(properties).length) {
packet.properties = properties
}
}
packet.payload = this._list.slice(this._pos, packet.length)
debug('_parsePublish: payload from buffer list: %o', packet.payload)
}
_parseSubscribe () {
debug('_parseSubscribe')
const packet = this.packet
let topic
let options
let qos
let rh
let rap
let nl
let subscription
packet.subscriptions = []
if (!this._parseMessageId()) { return }
// Properties mqtt 5
if (this.settings.protocolVersion === 5) {
const properties = this._parseProperties()
if (Object.getOwnPropertyNames(properties).length) {
packet.properties = properties
}
}
if (packet.length <= 0) { return this._emitError(new Error('Malformed subscribe, no payload specified')) }
while (this._pos < packet.length) {
// Parse topic
topic = this._parseString()
if (topic === null) return this._emitError(new Error('Cannot parse topic'))
if (this._pos >= packet.length) return this._emitError(new Error('Malformed Subscribe Payload'))
options = this._parseByte()
if (this.settings.protocolVersion === 5) {
if (options & 0xc0) {
return this._emitError(new Error('Invalid subscribe topic flag bits, bits 7-6 must be 0'))
}
} else {
if (options & 0xfc) {
return this._emitError(new Error('Invalid subscribe topic flag bits, bits 7-2 must be 0'))
}
}
qos = options & constants.SUBSCRIBE_OPTIONS_QOS_MASK
if (qos > 2) {
return this._emitError(new Error('Invalid subscribe QoS, must be <= 2'))
}
nl = ((options >> constants.SUBSCRIBE_OPTIONS_NL_SHIFT) & constants.SUBSCRIBE_OPTIONS_NL_MASK) !== 0
rap = ((options >> constants.SUBSCRIBE_OPTIONS_RAP_SHIFT) & constants.SUBSCRIBE_OPTIONS_RAP_MASK) !== 0
rh = (options >> constants.SUBSCRIBE_OPTIONS_RH_SHIFT) & constants.SUBSCRIBE_OPTIONS_RH_MASK
if (rh > 2) {
return this._emitError(new Error('Invalid retain handling, must be <= 2'))
}
subscription = { topic, qos }
// mqtt 5 options
if (this.settings.protocolVersion === 5) {
subscription.nl = nl
subscription.rap = rap
subscription.rh = rh
} else if (this.settings.bridgeMode) {
subscription.rh = 0
subscription.rap = true
subscription.nl = true
}
// Push pair to subscriptions
debug('_parseSubscribe: push subscription `%s` to subscription', subscription)
packet.subscriptions.push(subscription)
}
}
_parseSuback () {
debug('_parseSuback')
const packet = this.packet
this.packet.granted = []
if (!this._parseMessageId()) { return }
// Properties mqtt 5
if (this.settings.protocolVersion === 5) {
const properties = this._parseProperties()
if (Object.getOwnPropertyNames(properties).length) {
packet.properties = properties
}
}
if (packet.length <= 0) { return this._emitError(new Error('Malformed suback, no payload specified')) }
// Parse granted QoSes
while (this._pos < this.packet.length) {
const code = this._list.readUInt8(this._pos++)
if (this.settings.protocolVersion === 5) {
if (!constants.MQTT5_SUBACK_CODES[code]) {
return this._emitError(new Error('Invalid suback code'))
}
} else {
if (code > 2 && code !== 0x80) {
return this._emitError(new Error('Invalid suback QoS, must be 0, 1, 2 or 128'))
}
}
this.packet.granted.push(code)
}
}
_parseUnsubscribe () {
debug('_parseUnsubscribe')
const packet = this.packet
packet.unsubscriptions = []
// Parse messageId
if (!this._parseMessageId()) { return }
// Properties mqtt 5
if (this.settings.protocolVersion === 5) {
const properties = this._parseProperties()
if (Object.getOwnPropertyNames(properties).length) {
packet.properties = properties
}
}
if (packet.length <= 0) { return this._emitError(new Error('Malformed unsubscribe, no payload specified')) }
while (this._pos < packet.length) {
// Parse topic
const topic = this._parseString()
if (topic === null) return this._emitError(new Error('Cannot parse topic'))
// Push topic to unsubscriptions
debug('_parseUnsubscribe: push topic `%s` to unsubscriptions', topic)
packet.unsubscriptions.push(topic)
}
}
_parseUnsuback () {
debug('_parseUnsuback')
const packet = this.packet
if (!this._parseMessageId()) return this._emitError(new Error('Cannot parse messageId'))
if ((this.settings.protocolVersion === 3 ||
this.settings.protocolVersion === 4) && packet.length !== 2) {
return this._emitError(new Error('Malformed unsuback, payload length must be 2'))
}
if (packet.length <= 0) { return this._emitError(new Error('Malformed unsuback, no payload specified')) }
// Properties mqtt 5
if (this.settings.protocolVersion === 5) {
const properties = this._parseProperties()
if (Object.getOwnPropertyNames(properties).length) {
packet.properties = properties
}
// Parse granted QoSes
packet.granted = []
while (this._pos < this.packet.length) {
const code = this._list.readUInt8(this._pos++)
if (!constants.MQTT5_UNSUBACK_CODES[code]) {
return this._emitError(new Error('Invalid unsuback code'))
}
this.packet.granted.push(code)
}
}
}
// parse packets like puback, pubrec, pubrel, pubcomp
_parseConfirmation () {
debug('_parseConfirmation: packet.cmd: `%s`', this.packet.cmd)
const packet = this.packet
this._parseMessageId()
if (this.settings.protocolVersion === 5) {
if (packet.length > 2) {
// response code
packet.reasonCode = this._parseByte()
switch (this.packet.cmd) {
case 'puback':
case 'pubrec':
if (!constants.MQTT5_PUBACK_PUBREC_CODES[packet.reasonCode]) {
return this._emitError(new Error('Invalid ' + this.packet.cmd + ' reason code'))
}
break
case 'pubrel':
case 'pubcomp':
if (!constants.MQTT5_PUBREL_PUBCOMP_CODES[packet.reasonCode]) {
return this._emitError(new Error('Invalid ' + this.packet.cmd + ' reason code'))
}
break
}
debug('_parseConfirmation: packet.reasonCode `%d`', packet.reasonCode)
} else {
packet.reasonCode = 0
}
if (packet.length > 3) {
// properies mqtt 5
const properties = this._parseProperties()
if (Object.getOwnPropertyNames(properties).length) {
packet.properties = properties
}
}
}
return true
}
// parse disconnect packet
_parseDisconnect () {
const packet = this.packet
debug('_parseDisconnect')
if (this.settings.protocolVersion === 5) {
// response code
if (this._list.length > 0) {
packet.reasonCode = this._parseByte()
if (!constants.MQTT5_DISCONNECT_CODES[packet.reasonCode]) {
this._emitError(new Error('Invalid disconnect reason code'))
}
} else {
packet.reasonCode = 0
}
// properies mqtt 5
const properties = this._parseProperties()
if (Object.getOwnPropertyNames(properties).length) {
packet.properties = properties
}
}
debug('_parseDisconnect result: true')
return true
}
// parse auth packet
_parseAuth () {
debug('_parseAuth')
const packet = this.packet
if (this.settings.protocolVersion !== 5) {
return this._emitError(new Error('Not supported auth packet for this version MQTT'))
}
// response code
packet.reasonCode = this._parseByte()
if (!constants.MQTT5_AUTH_CODES[packet.reasonCode]) {
return this._emitError(new Error('Invalid auth reason code'))
}
// properies mqtt 5
const properties = this._parseProperties()
if (Object.getOwnPropertyNames(properties).length) {
packet.properties = properties
}
debug('_parseAuth: result: true')
return true
}
_parseMessageId () {
const packet = this.packet
packet.messageId = this._parseNum()
if (packet.messageId === null) {
this._emitError(new Error('Cannot parse messageId'))
return false
}
debug('_parseMessageId: packet.messageId %d', packet.messageId)
return true
}
_parseString (maybeBuffer) {
const length = this._parseNum()
const end = length + this._pos
if (length === -1 || end > this._list.length || end > this.packet.length) return null
const result = this._list.toString('utf8', this._pos, end)
this._pos += length
debug('_parseString: result: %s', result)
return result
}
_parseStringPair () {
debug('_parseStringPair')
return {
name: this._parseString(),
value: this._parseString()
}
}
_parseBuffer () {
const length = this._parseNum()
const end = length + this._pos
if (length === -1 || end > this._list.length || end > this.packet.length) return null
const result = this._list.slice(this._pos, end)
this._pos += length
debug('_parseBuffer: result: %o', result)
return result
}
_parseNum () {
if (this._list.length - this._pos < 2) return -1
const result = this._list.readUInt16BE(this._pos)
this._pos += 2
debug('_parseNum: result: %s', result)
return result
}
_parse4ByteNum () {
if (this._list.length - this._pos < 4) return -1
const result = this._list.readUInt32BE(this._pos)
this._pos += 4
debug('_parse4ByteNum: result: %s', result)
return result
}
_parseVarByteNum (fullInfoFlag) {
debug('_parseVarByteNum')
const maxBytes = 4
let bytes = 0
let mul = 1
let value = 0
let result = false
let current
const padding = this._pos ? this._pos : 0
while (bytes < maxBytes && (padding + bytes) < this._list.length) {
current = this._list.readUInt8(padding + bytes++)
value += mul * (current & constants.VARBYTEINT_MASK)
mul *= 0x80
if ((current & constants.VARBYTEINT_FIN_MASK) === 0) {
result = true
break
}
if (this._list.length <= bytes) {
break
}
}
if (!result && bytes === maxBytes && this._list.length >= bytes) {
this._emitError(new Error('Invalid variable byte integer'))
}
if (padding) {
this._pos += bytes
}
if (result) {
if (fullInfoFlag) {
result = { bytes, value }
} else {
result = value
}
} else {
result = false
}
debug('_parseVarByteNum: result: %o', result)
return result
}
_parseByte () {
let result
if (this._pos < this._list.length) {
result = this._list.readUInt8(this._pos)
this._pos++
}
debug('_parseByte: result: %o', result)
return result
}
_parseByType (type) {
debug('_parseByType: type: %s', type)
switch (type) {
case 'byte': {
return this._parseByte() !== 0
}
case 'int8': {
return this._parseByte()
}
case 'int16': {
return this._parseNum()
}
case 'int32': {
return this._parse4ByteNum()
}
case 'var': {
return this._parseVarByteNum()
}
case 'string': {
return this._parseString()
}
case 'pair': {
return this._parseStringPair()
}
case 'binary': {
return this._parseBuffer()
}
}
}
_parseProperties () {
debug('_parseProperties')
const length = this._parseVarByteNum()
const start = this._pos
const end = start + length
const result = {}
while (this._pos < end) {
const type = this._parseByte()
if (!type) {
this._emitError(new Error('Cannot parse property code type'))
return false
}
const name = constants.propertiesCodes[type]
if (!name) {
this._emitError(new Error('Unknown property'))
return false
}
// user properties process
if (name === 'userProperties') {
if (!result[name]) {
result[name] = Object.create(null)
}
const currentUserProperty = this._parseByType(constants.propertiesTypes[name])
if (result[name][currentUserProperty.name]) {
if (Array.isArray(result[name][currentUserProperty.name])) {
result[name][currentUserProperty.name].push(currentUserProperty.value)
} else {
const currentValue = result[name][currentUserProperty.name]
result[name][currentUserProperty.name] = [currentValue]
result[name][currentUserProperty.name].push(currentUserProperty.value)
}
} else {
result[name][currentUserProperty.name] = currentUserProperty.value
}
continue
}
if (result[name]) {
if (Array.isArray(result[name])) {
result[name].push(this._parseByType(constants.propertiesTypes[name]))
} else {
result[name] = [result[name]]
result[name].push(this._parseByType(constants.propertiesTypes[name]))
}
} else {
result[name] = this._parseByType(constants.propertiesTypes[name])
}
}
return result
}
_newPacket () {
debug('_newPacket')
if (this.packet) {
this._list.consume(this.packet.length)
debug('_newPacket: parser emit packet: packet.cmd: %s, packet.payload: %s, packet.length: %d', this.packet.cmd, this.packet.payload, this.packet.length)
this.emit('packet', this.packet)
}
debug('_newPacket: new packet')
this.packet = new Packet()
this._pos = 0
return true
}
_emitError (err) {
debug('_emitError', err)
this.error = err
this.emit('error', err)
}
}
module.exports = Parser
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