forked from max-mapper/screencat
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create.js
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create.js
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/* global screen, EventSource */
var zlib = require('zlib')
var SimplePeer = require('simple-peer')
var nets = require('nets')
var getUserMedia = require('./get-user-media.js')()
module.exports = function create (opts, connectedCb) {
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 video, videoSize
var ui = {}
ui.containers = {
share: document.querySelector('.share-container'),
join: document.querySelector('.join-container'),
content: document.querySelector('.content-container'),
choose: document.querySelector('.choose-container'),
video: document.querySelector('.video-container'),
sharing: document.querySelector('.sharing-container')
}
ui.buttons = {
share: document.querySelector('.share-button'),
join: document.querySelector('.join-button'),
copy: document.querySelector('.code-copy-button'),
paste: document.querySelector('.code-paste-button'),
quit: document.querySelector('.quit-button'),
back: document.querySelector('.back-button'),
destroy: document.querySelector('.destroy-button')
}
ui.inputs = {
copy: document.querySelector('.code-copy-input'),
paste: document.querySelector('.code-paste-input')
}
var constraints = {
audio: false,
video: {
mandatory: {
chromeMediaSource: 'screen',
maxWidth: screen.availWidth,
maxHeight: screen.availHeight,
maxFrameRate: 25
},
optional: []
}
}
var app = {
ui: ui,
startHandshake: startHandshake,
hide: hide,
show: show
}
return app
function startHandshake (remote) {
nets({url: remoteConfigUrl, json: true}, function gotConfig (err, resp, config) {
if (err || resp.statusCode > 299) config = undefined
if (remote) remotePeer(config)
else hostPeer(config)
})
function remotePeer (config) {
// first, wait for user to enter room name
ui.inputs.paste.value = ''
ui.buttons.paste.addEventListener('click', onJoinClick)
function onJoinClick (e) {
e.preventDefault()
var room = ui.inputs.paste.value
ui.inputs.paste.value = 'Connecting...'
if (!room) return
// ensure room is still open
nets({method: 'POST', uri: server + '/v1/' + room + '/pong', json: {ready: true}}, function response (err, resp, data) {
if (err) {
ui.inputs.paste.value = 'Error! ' + err.message
return
}
if (resp.statusCode !== 200) {
ui.inputs.paste.value = 'Invalid or expired invite code'
return
}
listenForPings(room)
})
}
function listenForPings (room) {
ui.inputs.paste.value = 'Waiting on other side...'
// listen for pings
var events = new EventSource(server + '/v1/' + room + '/pings')
events.onmessage = function onMessage (e) {
console.log('pings onmessage', e.data)
var row
try {
row = JSON.parse(e.data)
} catch (e) {
ui.inputs.copy.value = 'Error connecting. Please start over.'
row = {}
}
if (!row.data) {
return
}
inflate(row.data, function inflated (err, stringified) {
if (err) {
ui.inputs.copy.value = 'Error! Please Quit'
return
}
getAudio(function got (err, audioStream) {
if (err) {
handleRTCErr(err)
return
}
var peer = new SimplePeer({ trickle: false, config: config })
if (audioStream) peer._pc.addStream(audioStream)
handleSignal(peer, true, room)
peer.signal(JSON.parse(stringified.toString()))
})
})
events.close()
}
events.onerror = function onError (e) {
ui.inputs.copy.value = 'Error connecting. Please start over.'
events.close()
}
}
// try getusermedia and then upload sdp pong. this causes host to ping sdp back
function getAudio (cb) {
ui.inputs.paste.value = 'Please allow or deny voice chat...'
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') {
cb()
} else {
cb(err)
}
}
)
}
}
function hostPeer (config) {
var peer
ui.inputs.copy.value = 'Loading...'
// create room
nets({method: 'POST', uri: server + '/v1'}, function response (err, resp, body) {
if (err) {
ui.inputs.copy.value = 'Error! ' + err.message
return
}
var room = JSON.parse(body)
ui.inputs.copy.value = room.name
// listen for pongs
var events = new EventSource(server + '/v1/' + room.name + '/pongs')
events.onmessage = function onMessage (e) {
console.log('pongs onmessage', e.data)
var row
try {
row = JSON.parse(e.data)
} catch (e) {
ui.inputs.copy.value = 'Error connecting. Please start over.'
row = {}
}
// 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) {
ui.inputs.copy.value = 'Error! Please Quit'
return
}
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)
ui.inputs.copy.value = 'Waiting for other side...'
handleSignal(peer, false, room.name)
}, handleRTCErr)
}, handleRTCErr)
}
}
events.onerror = function onError (e) {
ui.inputs.copy.value = 'Error connecting. Please start over.'
events.close()
}
})
}
}
function handleRTCErr (err) {
if (err.name === 'PermissionDeniedError') {
console.error('permission denied')
console.error(err)
throw new Error('SCREENSHARING PERMISSION DENIED')
} else {
console.error('unknown error')
throw err
}
}
function handleSignal (peer, remote, room) {
window.PEER = peer // for debugging
var queue = []
peer.on('signal', function onSignal (sdp) {
deflate(sdp, function deflated (err, data) {
if (err) {
ui.containers.content.innerHTML = 'Error! Please Quit. ' + err.message
return
}
if (!room) {
var el
if (remote) el = ui.inputs.paste
else el = ui.inputs.copy
el.value = 'Error! Please Quit'
return
}
// upload sdp
var uploadURL = server + '/v1/' + room
if (remote) uploadURL += '/pong'
else uploadURL += '/ping'
console.log('POST', uploadURL, data)
nets({method: 'POST', json: {data: data}, uri: uploadURL}, function response (err, resp, body) {
if (err) {
if (remote) ui.inputs.paste.value = err.message
else ui.inputs.copy.value = err.message
return
}
if (resp.statusCode > 299) {
if (remote) ui.inputs.paste.value = err.message
else ui.inputs.copy.value = err.message
return
}
})
})
})
peer.on('stream', function (stream) {
stream.getAudioTracks().forEach(function each (track) {
renderAudio(stream)
})
stream.getVideoTracks().forEach(function each (track) {
renderVideo(stream)
})
})
if (peer.connected) onConnect()
else peer.on('connect', onConnect)
function onConnect () {
if (connectedCb) connectedCb(peer, remote)
app.show(ui.containers.video)
app.hide(ui.containers.content)
if (!remote) {
app.show(ui.containers.sharing)
peer.on('data', function (data) {
console.log('got data', JSON.stringify(data))
app.hide(ui.containers.content)
queue.push(data)
if (queue.length === 1) startQueue()
})
return
}
window.addEventListener('mousedown', mousedownListener)
window.addEventListener('keydown', keydownListener)
peer.on('close', function cleanup () {
window.removeEventListener('mousedown', mousedownListener)
window.removeEventListener('keydown', keydownListener)
ui.containers.video.innerHTML = ''
})
function mousedownListener (e) {
var data = getMouseData(e)
data.click = true
console.log('send mouse', 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) {
videoSize = video.getBoundingClientRect()
data.canvasWidth = videoSize.width
data.canvasHeight = videoSize.height
}
return data
}
}
// magic queue that helps prevent weird key drop issues on the c++ side
function startQueue () {
if (queue.started) return
queue.started = true
queue.id = setInterval(function () {
var next = queue.shift()
if (!next) {
clearInterval(queue.id)
queue.started = false
return
}
if (app.robot) {
app.robot(next)
}
}, 0)
}
}
function renderVideo (stream) {
video = document.createElement('video')
video.src = window.URL.createObjectURL(stream)
video.autoplay = true
ui.containers.video.appendChild(video)
app.hide(ui.containers.video)
}
function renderAudio (stream) {
var audio = document.createElement('audio')
audio.src = window.URL.createObjectURL(stream)
audio.autoplay = true
ui.containers.video.appendChild(audio)
app.hide(ui.containers.video)
}
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)
})
}
function show (ele) {
if (!ele) return
ele.classList.remove('dn')
}
function hide (ele) {
if (!ele) return
ele.classList.add('dn')
ele.classList.remove('db')
}
}