host.js

   1 document.title = "Strapp.io Host"
   2 const clients = [] //TODO: Change to Map
   3 if ("WebSocket" in window) {
   4   document.addEventListener('DOMContentLoaded', (event) => {
   5     const wsock = new WebSocket(`${_strapp_protocol}://${window.location.hostname}:${_strapp_port}`)
   6     wsock.onopen = () => {
   7       console.log(`Strapped to ${_strapp_protocol}://${window.location.hostname}:${_strapp_port}`)
   8
   9     }
  10     wsock.onmessage = (msg) => {
  11       /* Message is offer from client */
  12       /* TODO: Determine which client ?? */
  13       console.log("Incoming connection " + msg)
  14
  15       /* TODO: State machine to parse offer */
  16
  17       /* New Client Connection*/
  18       hpc = new RTCPeerConnection()
  19
  20       hpc.createAnswer().then((offer) => {
  21         return hpc.setLocalDescription(offer)
  22       }).then(() => {
  23         return hpc.setRemoteDescription(msg.sdp)
  24       }).then(() => {
  25         const hpk = getPublicKey()
  26         wsock.send({
  27           cmd: '< sdp pubKey',
  28           sdp: hpc.localDescription,
  29           pubKey: hpk
  30         })
  31         clients.push({
  32           hostsdp: hpc.localDescription,
  33           clientsdp: hpc.remoteDescription,
  34           clientPubKey: msg.pubKey
  35         })
  36
  37       })
  38     }
  39   })
  40 }
  41 else {
  42   document.addEventListener('DOMContentLoaded', () => {
  43     document.body.innerHTML = 'Websockets not supported in your browser'
  44   })
  45 }
  46 /* TODO: duplicate in both client.js and host.jhs */
  47 function getPublicKey() {
  48   /* Check local storage for public key */
  49   if (window.localStorage.getItem('public-key') === undefined) {
  50     /* If doesn't exist, generate public and private key pair, store in
  51     local storage */
  52     crypto.subtle.generateKey({name:'RSA-OAEP', length: 192}, true, ['encrypt', 'decrypt'])
  53       .then((keyPair) => {
  54         /* TODO: Do we need to store the private key as well? */
  55         window.localStorage.setItem('public-key', keyPair.type.public.toString())
  56       })
  57   }
  58     console.log(window.localStorage.getItem('public-key'))
  59     return window.localStorage.getItem('public-key')
  60 }