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peer.js
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peer.js
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/* global screen, EventSource */
var zlib = require('zlib')
var events = require('events')
var SimplePeer = require('simple-peer')
var nets = require('nets')
var getUserMedia = require('./get-user-media.js')()
module.exports = function create (opts) {
var server = 'http://catlobby.maxogden.com'
// var server = 'http://localhost:5005'
var remoteConfigUrl = 'https://instant.io/rtcConfig'
if (process.browser) remoteConfigUrl = 'http://cors.maxogden.com/' + remoteConfigUrl
var videoSize
var constraints = {
audio: false,
video: {
mandatory: {
chromeMediaSource: 'screen',
maxWidth: screen.availWidth,
maxHeight: screen.availHeight,
maxFrameRate: 25
},
optional: []
}
}
var pc = new events.EventEmitter()
pc.getRemoteConfig = getRemoteConfig
pc.verifyRoom = verifyRoom
pc.remotePeer = remotePeer
pc.hostPeer = hostPeer
pc.handleSignal = handleSignal
pc.videoElement = videoElement
pc.audioElement = audioElement
pc.onConnect = onConnect
pc.createRoom = createRoom
return pc
function verifyRoom (room, cb) {
// ensure room is still open
nets({method: 'POST', uri: server + '/v1/' + room + '/pong', json: {ready: true}}, function response (err, resp, data) {
if (err) return cb(err)
if (resp.statusCode !== 200) return cb(new Error('Invalid or expired invite code'))
cb()
})
}
// get remote webrtc config (ice/stun/turn)
function getRemoteConfig (cb) {
nets({url: remoteConfigUrl, json: true}, function gotConfig (err, resp, config) {
if (err || resp.statusCode > 299) config = undefined // ignore errors
cb(null, config)
})
}
// try getusermedia and then upload sdp pong. this causes host to ping sdp back
function getAudio (cb) {
getUserMedia({audio: true, video: false}, function ok (stream) {
cb(null, stream)
},
function error (err) {
// screenshare even if remote doesnt wanna do audio
if (err.name === 'PermissionDeniedError' || err.name === 'DevicesNotFoundError') {
cb()
} else {
cb(err)
}
})
}
function remotePeer (config, room, cb) {
// listen for pings
var pingsUrl = server + '/v1/' + room + '/pings'
console.log('getting pings', pingsUrl)
var events = new EventSource(pingsUrl)
events.onmessage = function onMessage (e) {
console.log('pings onmessage', e.data)
var row
try {
row = JSON.parse(e.data)
} catch (e) {
row = {}
return cb(new Error('Error connecting. Please start over.'))
}
if (!row.data) {
return
}
inflate(row.data, function inflated (err, stringified) {
if (err) return cb(err)
pc.emit('getting-audio')
getAudio(function got (err, audioStream) {
if (err) return handleRTCErr(err, cb)
var peer = new SimplePeer({ trickle: false, config: config })
if (audioStream) peer._pc.addStream(audioStream)
peer.signal(JSON.parse(stringified.toString()))
cb(null, peer)
})
})
events.close()
}
events.onerror = function onError (e) {
cb(new Error('Error connecting. Please start over.'))
events.close()
}
}
function createRoom (cb) {
nets({method: 'POST', uri: server + '/v1'}, function response (err, resp, body) {
if (err) return cb(err)
var room = JSON.parse(body)
cb(null, room.name)
})
}
function hostPeer (room, config, cb) {
var peer
// listen for pongs
var events = new EventSource(server + '/v1/' + room + '/pongs')
events.onmessage = function onMessage (e) {
console.log('pongs onmessage', e.data)
var row
try {
row = JSON.parse(e.data)
} catch (e) {
return cb(new Error('Error connecting. Please start over.'))
}
// other side is ready
if (row.ready) {
connect(row.data)
}
// sdp from other side
if (row.data) {
inflate(row.data, function inflated (err, stringified) {
if (err) {
return cb(new Error('Error connecting. Please start over.'))
}
peer.signal(JSON.parse(stringified.toString()))
})
events.close()
}
function connect (pong) {
// screensharing
getUserMedia(constraints, function (videoStream) {
// audio
getUserMedia({audio: true, video: false}, function (audioStream) {
peer = new SimplePeer({ initiator: true, trickle: false, config: config })
peer._pc.addStream(videoStream)
peer._pc.addStream(audioStream)
pc.emit('waiting-for-peer')
cb(null, peer)
}, function (err) { handleRTCErr(err, cb) })
}, function (err) { handleRTCErr(err, cb) })
}
}
events.onerror = function onError (e) {
cb(e)
events.close()
}
}
function handleRTCErr (err, cb) {
if (err.name === 'PermissionDeniedError') {
console.error('permission denied')
console.error(err)
cb(new Error('Screensharing permission denied'))
} else {
console.error('Unknown error', err)
cb(err)
}
}
function handleSignal (sdp, peer, remote, room, cb) {
deflate(sdp, function deflated (err, data) {
if (err) return cb(err)
// upload sdp
var uploadURL = server + '/v1/' + room
if (remote) uploadURL += '/pong'
else uploadURL += '/ping'
console.log('POST', uploadURL)
nets({method: 'POST', json: {data: data}, uri: uploadURL}, function response (err, resp, body) {
if (err || resp.statusCode > 299) return cb(err)
cb(null)
})
})
}
function onConnect (peer, remote) {
pc.emit('connected', peer, remote)
var video
if (remote) {
window.addEventListener('mouseup', mouseupListener)
window.addEventListener('keydown', keydownListener)
}
if (!remote) {
peer.on('data', function (data) {
if (!pc.robot) return
console.log(data)
pc.robot(data)
})
return
}
peer.on('close', function cleanup () {
window.removeEventListener('mouseup', mouseupListener)
window.removeEventListener('keydown', keydownListener)
})
function mouseupListener (e) {
var data = getMouseData(e)
data.click = true
console.log('send mouseup', data)
peer.send(data)
}
function keydownListener (e) {
e.preventDefault()
var data = {
keyCode: e.keyCode,
shift: e.shiftKey,
meta: e.metaKey,
control: e.ctrlKey,
alt: e.altKey
}
console.log('send key', data)
peer.send(data)
}
function getMouseData (e) {
var data = {}
data.clientX = e.clientX
data.clientY = e.clientY
if (!video) video = document.querySelector('video')
if (video) {
videoSize = video.getBoundingClientRect()
data.canvasWidth = videoSize.width
data.canvasHeight = videoSize.height
}
return data
}
}
function videoElement (stream) {
var video = document.createElement('video')
video.src = window.URL.createObjectURL(stream)
video.autoplay = true
return video
}
function audioElement (stream) {
var audio = document.createElement('audio')
audio.src = window.URL.createObjectURL(stream)
audio.autoplay = true
return audio
}
function inflate (data, cb) {
data = decodeURIComponent(data.toString())
zlib.inflate(new Buffer(data, 'base64'), cb)
}
function deflate (data, cb) {
// sdp is ~2.5k usually, that's too big for a URL, so we zlib deflate it
var stringified = JSON.stringify(data)
zlib.deflate(stringified, function (err, deflated) {
if (err) {
cb(err)
return
}
var connectionString = deflated.toString('base64')
var code = encodeURIComponent(connectionString)
cb(null, code)
})
}
}