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client.js
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const http = require('http')
const EventEmitter = require('events')
const {promisify} = require('util')
const xml2js = require('xml2js')
const entities = require('entities')
const debugFactory = require('debug')
const xmlbuilder = require('xmlbuilder')
const universalify = require('./frompromise.js')
const debug = debugFactory('wemo-client')
/** @type {(str, opts) => Promise} */
const parseXml = promisify(xml2js.parseString)
function mapCapabilities (capabilityIds, capabilityValues) {
const ids = capabilityIds.split(',')
const values = capabilityValues.split(',')
const result = {}
ids.forEach((val, index) => {
result[val] = values[index]
})
return result
}
class WemoClient extends EventEmitter {
subscriptions = {}
error
constructor (config) {
super()
this.host = config.host
this.port = config.port
this.deviceType = config.deviceType
this.UDN = config.UDN
this.callbackURL = config.callbackURL
this.device = config
// Create map of services
config.serviceList.service.forEach(function (service) {
this[service.serviceType] = {
serviceId: service.serviceId,
controlURL: service.controlURL,
eventSubURL: service.eventSubURL
}
}, this.services = {})
// Transparently subscribe to serviceType events
// TODO: Unsubscribe from ServiceType when all listeners have been removed.
this.on('newListener', this._onListenerAdded)
}
async soapAction (serviceType, action, body) {
this._verifyServiceSupport(serviceType)
const xml = xmlbuilder.create('s:Envelope', {
version: '1.0',
encoding: 'utf-8',
allowEmpty: true
})
.att('xmlns:s', 'http://schemas.xmlsoap.org/soap/envelope/')
.att('s:encodingStyle', 'http://schemas.xmlsoap.org/soap/encoding/')
.ele('s:Body')
.ele('u:' + action)
.att('xmlns:u', serviceType)
const payload = (body ? xml.ele(body) : xml).end()
const options = {
host: this.host,
port: this.port,
path: this.services[serviceType].controlURL,
method: 'POST',
headers: {
SOAPACTION: '"' + serviceType + '#' + action + '"',
'Content-Type': 'text/xml; charset="utf-8"'
}
}
const response = await WemoClient.request(options, payload).catch(err => {
this.error = err.code
this.emit('error', err)
throw err
})
return response && response['s:Envelope']['s:Body'][`u:${action}Response`]
}
async getEndDevices () {
const parseDeviceInfo = function (data) {
const device = {}
if (data.GroupID) {
// treat device group as it was a single device
device.friendlyName = data.GroupName[0]
device.deviceId = data.GroupID[0]
device.capabilities = mapCapabilities(
data.GroupCapabilityIDs[0],
data.GroupCapabilityValues[0]
)
} else {
// single device
device.friendlyName = data.FriendlyName[0]
device.deviceId = data.DeviceID[0]
device.capabilities = mapCapabilities(
data.CapabilityIDs[0],
data.CurrentState[0]
)
}
// set device type
if (device.capabilities.hasOwnProperty('10008')) {
device.deviceType = 'dimmableLight'
}
if (device.capabilities.hasOwnProperty('10300')) {
device.deviceType = 'colorLight'
}
return device
}
const data = await this.soapAction('urn:Belkin:service:bridge:1', 'GetEndDevices', {
DevUDN: this.UDN,
ReqListType: 'PAIRED_LIST'
})
debug('endDevices raw data', data)
const endDevices = []
const result = await parseXml(data.DeviceLists)
const deviceInfos = result.DeviceLists.DeviceList[0].DeviceInfos[0].DeviceInfo
if (deviceInfos) {
endDevices.push(...deviceInfos.map(parseDeviceInfo))
}
if (result.DeviceLists.DeviceList[0].GroupInfos) {
const groupInfos = result.DeviceLists.DeviceList[0].GroupInfos[0].GroupInfo
endDevices.push(...groupInfos.map(parseDeviceInfo))
}
return endDevices
}
async setDeviceStatus (deviceId, capability, value) {
const deviceStatusList = xmlbuilder.create('DeviceStatus', {
version: '1.0',
encoding: 'utf-8'
}).ele({
IsGroupAction: (deviceId.length === 10) ? 'YES' : 'NO',
DeviceID: deviceId,
CapabilityID: capability,
CapabilityValue: value
}).end()
return this.soapAction('urn:Belkin:service:bridge:1', 'SetDeviceStatus', {
DeviceStatusList: { '#text': deviceStatusList }
})
}
async getDeviceStatus (deviceId) {
const data = await this.soapAction('urn:Belkin:service:bridge:1', 'GetDeviceStatus', {
DeviceIDs: deviceId
})
const result = await parseXml(data.DeviceStatusList, { explicitArray: false })
const deviceStatus = result.DeviceStatusList.DeviceStatus
const capabilities = mapCapabilities(deviceStatus.CapabilityID, deviceStatus.CapabilityValue)
return capabilities
}
async setLightColor (deviceId, red, green, blue) {
const color = WemoClient.rgb2xy(red, green, blue)
return this.setDeviceStatus(deviceId, 10300, color.join(':') + ':0')
}
async setBinaryState (value) {
return this.soapAction('urn:Belkin:service:basicevent:1', 'SetBinaryState', {
BinaryState: value
})
}
async getBinaryState () {
const {BinaryState} = await this.soapAction('urn:Belkin:service:basicevent:1', 'GetBinaryState', null)
return BinaryState
}
async setBrightness (brightness) {
const settings = brightness === 0
? { BinaryState: 0 }
: { brightness }
return this.soapAction('urn:Belkin:service:basicevent:1', 'SetBinaryState', settings)
}
async getBrightness () {
const { brightness } = await this.soapAction('urn:Belkin:service:basicevent:1', 'GetBinaryState', null)
return parseInt(brightness)
}
async setAttributes (attributes) {
const builder = new xml2js.Builder({ rootName: 'attribute', headless: true, renderOpts: { pretty: false } })
const xml_attributes = Object.keys(attributes).map((attribute_key) => {
return builder.buildObject({ name: attribute_key, value: attributes[attribute_key] })
}).join('')
return this.soapAction('urn:Belkin:service:deviceevent:1', 'SetAttributes', {
attributeList: {
'#text': xml_attributes
}
})
}
async getAttributes () {
const data = await this.soapAction('urn:Belkin:service:deviceevent:1', 'GetAttributes', null)
const xml = '<attributeList>' + entities.decodeXML(data.attributeList) + '</attributeList>'
const result = await parseXml(xml, { explicitArray: false })
const attributes = {}
for (const key in result.attributeList.attribute) {
const attribute = result.attributeList.attribute[key]
attributes[attribute.name] = attribute.value
}
return attributes
}
async getInsightParams (cb) {
const data = await this.soapAction('urn:Belkin:service:insight:1', 'GetInsightParams', null).catch(err => {
cb(err)
throw err
})
const params = this._parseInsightParams(data.InsightParams)
cb(null, params.binaryState, params.instantPower, params.insightParams)
return params
}
_parseInsightParams (paramsStr) {
const params = paramsStr.split('|')
return {
binaryState: params[0],
instantPower: params[7],
insightParams: {
ONSince: params[1],
OnFor: params[2],
TodayONTime: params[3],
TodayConsumed: params[8] // power consumer today (mW per minute)
}
}
}
_onListenerAdded (eventName) {
const serviceType = WemoClient.EventServices[eventName]
if (serviceType && this.services[serviceType]) {
this._subscribe(serviceType)
}
}
_subscribe (serviceType) {
this._verifyServiceSupport(serviceType)
if (!this.callbackURL) {
throw new Error('Can not subscribe without callbackURL')
}
if (this.subscriptions[serviceType] && this.subscriptions[serviceType] === 'PENDING') {
debug('subscription still pending')
return
}
const options = {
host: this.host,
port: this.port,
path: this.services[serviceType].eventSubURL,
method: 'SUBSCRIBE',
headers: {
TIMEOUT: 'Second-300'
}
}
if (!this.subscriptions[serviceType]) {
// Initial subscription
this.subscriptions[serviceType] = 'PENDING'
debug('Initial subscription - Device: %s, Service: %s', this.UDN, serviceType)
options.headers.CALLBACK = '<' + this.callbackURL + '/' + this.UDN + '>'
options.headers.NT = 'upnp:event'
} else {
// Subscription renewal
debug('Renewing subscription - Device: %s, Service: %s', this.UDN, serviceType)
options.headers.SID = this.subscriptions[serviceType]
}
const req = http.request(options, res => {
if (res.statusCode === 200) {
// Renew after 150 seconds
this.subscriptions[serviceType] = res.headers.sid
setTimeout(this._subscribe.bind(this), 150 * 1000, serviceType)
} else {
// Try to recover from failed subscription after 2 seconds
debug('Subscription request failed with HTTP %s', res.statusCode)
this.subscriptions[serviceType] = null
setTimeout(this._subscribe.bind(this), 2000, serviceType)
}
})
req.on('error', (err) => {
debug('Subscription error: %s - Device: %s, Service: %s', err.code, this.UDN, serviceType)
this.subscriptions[serviceType] = null
this.error = err.code
this.emit('error', err)
})
req.end()
}
_verifyServiceSupport (serviceType) {
if (!this.services[serviceType]) {
throw new Error('Service ' + serviceType + ' not supported by ' + this.UDN)
}
}
handleCallback (body) {
const handler = {
BinaryState: data => {
this.emit('binaryState', data.substring(0, 1))
},
Brightness: data => {
this.emit('brightness', parseInt(data))
},
StatusChange: data => {
xml2js.parseString(data, { explicitArray: false }, (err, xml) => {
if (!err) {
this.emit('statusChange',
xml.StateEvent.DeviceID._,
xml.StateEvent.CapabilityId,
xml.StateEvent.Value
)
}
})
},
InsightParams: data => {
const params = this._parseInsightParams(data)
this.emit('insightParams', params.binaryState, params.instantPower, params.insightParams)
},
attributeList: data => {
const xml = '<attributeList>' + entities.decodeXML(data) + '</attributeList>'
xml2js.parseString(xml, { explicitArray: true }, (err, result) => {
if (!err) {
// In order to keep the existing event signature this
// triggers an event for every attribute changed.
result.attributeList.attribute.forEach((attribute) => {
this.emit('attributeList',
attribute.name[0],
attribute.value[0],
attribute.prevalue[0],
attribute.ts[0]
)
})
}
})
}
}
xml2js.parseString(body, { explicitArray: false }, function (err, xml) {
if (err) { throw err }
for (const prop in xml['e:propertyset']['e:property']) {
if (handler.hasOwnProperty(prop)) {
handler[prop](xml['e:propertyset']['e:property'][prop])
} else {
debug('Unhandled Event: %s', prop)
}
}
})
}
static async request (options, data) {
const body = await new Promise((rs, rj) => {
const req = http.request(options, res => {
let body = ''
res.setEncoding('utf8')
res.on('error', rj)
res.on('data', chunk => { body += chunk })
res.on('end', () => res.statusCode === 200
? rs(body)
: rj(new Error('HTTP ' + res.statusCode + ': ' + body))
)
})
req.on('error', rj)
if (data) req.write(data)
req.end()
})
return parseXml(body, { explicitArray: false })
}
static rgb2xy (r, g, b) {
// Based on: https://github.com/aleroddepaz/pyhue/blob/master/src/pyhue.py
const X = (0.545053 * r) + (0.357580 * g) + (0.180423 * b)
const Y = (0.212671 * r) + (0.715160 * g) + (0.072169 * b)
const Z = (0.019334 * r) + (0.119193 * g) + (0.950227 * b)
const x = X / (X + Y + Z)
const y = Y / (X + Y + Z)
return [
Math.round(x * 65535),
Math.round(y * 65535)
]
}
}
WemoClient.EventServices = {
insightParams: 'urn:Belkin:service:insight:1',
statusChange: 'urn:Belkin:service:bridge:1',
attributeList: 'urn:Belkin:service:basicevent:1',
binaryState: 'urn:Belkin:service:basicevent:1'
}
for (let x of ['request'])
WemoClient[x] = universalify(WemoClient[x])
for (let x of [
'getAttributes',
'getBinaryState',
'getBrightness',
'getDeviceStatus',
'getEndDevices',
'setAttributes',
'setBinaryState',
'setDeviceStatus',
'setLightColor',
'soapAction'
])
WemoClient.prototype[x] = universalify(WemoClient.prototype[x])
module.exports = WemoClient
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