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