const body = document.createElement('body') const root = document.createElement('div') document.title = "Strapp.io Client" const conf = {"iceServers": [{ "urls": "stun:stun.1.google.com:19302" }] } /* TODO: This is duplicated in both client.js and host.js */ function getPublicKey() { return new Promise( (resolve, reject) => { /* Check local storage for public key */ if (!window.localStorage.getItem('public-key')) { /* If doesn't exist, generate public and private key pair, store in local storage */ crypto.subtle.generateKey( { name:'RSA-OAEP', modulusLength: 2048, publicExponent: new Uint8Array([0x01, 0x00, 0x01]), hash: {name: "SHA-256"} }, true, ['encrypt', 'decrypt'] ).then((keyPair) => { /* TODO: Do we need to store the private key as well? */ crypto.subtle.exportKey('jwk', keyPair.publicKey) .then((exportedKey) => { window.localStorage.setItem('publicKey', exportedKey) console.log('public key is' + window.localStorage.getItem('publicKey')) resolve(exportedKey) }) }) } else { resolve(window.localStorage.getItem('publicKey')) } }) } function sendHost(url, data) { const request = new XMLHttpRequest() request.open('GET', url, true) request.setRequestHeader('Content-Type', 'application/json' ) request.setRequestHeader('x-strapp-type', 'ice-candidate-submission') request.send(data) } /* Poll the server. Send get request, wait for timeout, send another request. Do this until...? Can be used for either reconnecting or waiting for answer*/ function requestHostAnswer(url, data) { return new Promise((resolve, reject) => { const request = new XMLHttpRequest() request.open('GET', url, true) /* But there is no JSON? */ request.setRequestHeader('Content-Type', 'application/json' ) request.setRequestHeader('x-strapp-type', 'client-sdp-offer') request.setRequestHeader('x-strapp-pubkey', data.pubKey) request.onreadystatechange = () => { if (request.status === 200) { if(request.readyState === 4) { console.log('Client: Recieved Answer from Host') console.log(request) resolve(request.response) } } else if (request.status === 504) { console.log('timed out, resending') resolve(requestHostAnswer(url, data)) } else { reject('server unhandled response of status ' + request.status) } } request.send(data) }) } /* Poll server for ice candidates until ice is complete */ function requestHostICE(cpc, url, pubKey) { let intervalID = window.setInterval(() => { if (cpc.iceConnectionState.localeCompare('connected') !== 0 && cpc.iceConnectionState.localeCompare('completed') !== 0) { console.log('Client: Polling server begin for intervalID = ' + intervalID) console.log('Client: Requesting ICE Candidates from server') const request = new XMLHttpRequest() request.open('GET', url, true) request.setRequestHeader('Content-Type', 'application/json' ) request.setRequestHeader('x-strapp-Type', 'ice-candidate-request') request.setRequestHeader('x-client-pubkey', pubKey) request.onreadystatechange = () => { if (request.status === 200) { if(request.readyState === 4) { console.log('Client: Recieved ICE response from Host') let response = JSON.parse(request.response) switch(response['iceState']) { case "a": cpc.addIceCandidate(new RTCIceCandidate(response.ice)) break case "g": /* Gathering so let interval keep polling */ break case "c": /* host iceState == Complete, stop bugging it */ clearInterval(intervalID) clearTimeout() break default: console.log('Unhandled iceState in requestHostICE()' + response['iceState']) break } } } else { console.log('server unhandled response of status ' + request.status) clearInterval(intervalID) } } request.send() } else { clearTimeout() clearInterval(intervalID) } }, 5000) } /* Create and send offer -> Send ICE Candidates -> Poll for ICE Candidates */ getPublicKey().then((cpk) => { let dataChannel console.log('Client: Create and send offer') const cpc = new RTCPeerConnection(conf) cpc.oniceconnectionstatechange = () => { console.log('iceConnectionState = ' + cpc.iceConnectionState) } cpc.onnegotiationneeded = () => { console.log('negotiation needed!') cpc.createOffer().then((offer) => { return cpc.setLocalDescription(offer) }) .then(() => { console.log('Client: Sending offer to host') let offer = { cmd: '> sdp pubKey', sdp: cpc.localDescription, pubKey: cpk.n } return requestHostAnswer(window.location, offer) }) .then((serverResponse) => { const answer = JSON.parse(serverResponse) console.log('Client: Polling for ICE candidates') requestHostICE(cpc, window.location, cpk.n) cpc.setRemoteDescription(answer.sdp) cpc.onicecandidate = (event) => { if (event.candidate) { console.log('Client: Sending ice candidate to host') sendHost(window.location, JSON.stringify({ cmd: '> ice pubkey', ice: event.candidate, pubKey: cpk.n })) } else { console.log('Client: No more Ice Candidates to send') } } }).catch( (err) => { console.log('error in sdp handshake: ' + err) }) } /* Start data channel, triggers on negotiation needed */ dataChannel = cpc.createDataChannel("sendChannel"); /* Triggered when Host adds track to peer connection */ cpc.ontrack = (event) => { let remoteRTPReceivers = cpc.getReceivers() let hostScreen let video = document.querySelector('video') /* TODO: Audio, video, or other track? */ console.log(remoteRTPReceivers) console.log(video) hostScreen = new MediaStream([remoteRTPReceivers[0].track]) if(!video.srcObject) { video.srcObject = hostScreen } console.log(hostScreen.getVideoTracks()) console.log(video.srcObject) video.onloadedmetadata = () => { video.play() } } dataChannel.onmessage = (msg) => { /* Get mediaStream from host and add it to the video */ let hostMessage = JSON.parse(msg.data) console.log('Client: Renego') cpc.setRemoteDescription(hostMessage.sdp).then(() => { cpc.createAnswer().then((answer) => { return cpc.setLocalDescription(answer) }).then(() => { dataChannel.send(JSON.stringify({ "cmd": "> screen dataChannel", "sdp": cpc.localDescription })) }) }) } dataChannel.onopen = () => { document.body.innerHTML = (`
`) } }) document.addEventListener('DOMContentLoaded', () => { document.body.innerHTML = `` });