X-Git-Url: https://git.kengrimes.com/?p=henge%2Fkiak.git;a=blobdiff_plain;f=client.js;h=cb3872fed4563fa532d7b6209d059e6a8c1a35af;hp=3f0aeec956e76f04201d65717744f4d645ffde92;hb=db732e6001859d6f3900ecf1d921513bc24a5c23;hpb=69adc9a3512752d627e126dde85c859fcba9fb63

diff --git a/client.js b/client.js
index 3f0aeec..cb3872f 100644
--- a/client.js
+++ b/client.js
@@ -3,3 +3,180 @@ const root = document.createElement('div')
 document.title = "Strapp.io Client"
 body.appendChild(root)
 document.body = body
+const conf = {"iceServers": [{ "urls": "stun:stun.1.google.com:19302" }] }
+
+/* TODO: duplicate 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')) {
+      console.log('public key is undefined')
+      /* 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 postServer(url, data) {
+  const request = new XMLHttpRequest()
+  request.open('POST', url, true)
+  request.setRequestHeader('Content-Type', 'application/json' )
+  request.setRequestHeader('X-Strapp-Type', 'ice-candidate-submission')
+  request.send(data)
+}
+
+/* TODO: All this does is wrap a function in a promise */
+function pollServer(url, clientPubKey, func) {
+  return new Promise((resolve, reject) => {
+    func(url, clientPubKey, resolve, reject )
+  })
+}
+
+/* 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 pollServerForAnswer(url, data, 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-Client-Offer', JSON.stringify(data))
+  request.onreadystatechange = () => {
+    if (request.status === 200) {
+      if(request.readyState === 4) {
+        console.log('Client: Recieved response from Host')
+        console.log(request)
+        resolve(request.response)
+      }
+    }
+    else if (request.status === 504) {
+      console.log('timed out, resending')
+      pollServerTimeout(url, data, resolve, reject)
+    }
+    else {
+      reject('server unhandled response of status ' + request.status)
+    }
+  }
+  request.send()
+}
+
+/* Poll server for ice candidates until ice is complete */
+function pollServerForICECandidate(cpc) {
+  window.setInterval(() => {
+    if (cpc.iceGatheringState.localeCompare('complete') === 0) {
+      return new Promise((resolve, reject) => {
+         console.log('Client: Requesting ICE Candidates from server')
+         const request = new XMLHttpRequest()
+         request.open('GET', window.location, true)
+         request.setRequestHeader('Content-Type', 'application/json' )
+         request.setRequestHeader('X-Strapp-Type', 'ice-candidate-request')
+         request.onreadystatechange = () => {
+           if (request.status === 200) {
+             if(request.readyState === 4) {
+               console.log('Client: Recieved ICE Candidate from Host')
+               resolve(request.response)
+             }
+           }
+           else if (request.status === 204) {
+             console.log('Ice Candidate unavailable, trying again in one second')
+           }
+           else {
+             reject('server unhandled response of status ' + request.status)
+           }
+         }
+         request.send(cpc.pubKey)
+      }).then((response) => {
+        console.log('Client: Adding Ice Candidate ')
+        cpc.addIceCandidate(response.candidate)
+      }).catch((err) => {
+        console.log('pollServerForICECandidate: ' + err)
+      })
+    }
+    else {
+      clearTimeout()
+    }
+  }, 2000)
+}
+
+/* Create, set, and get client Offer. Poll server for host answer.
+   Set host answer as client remoteDescription */
+getPublicKey().then((cpk) => {
+  const cpc = new RTCPeerConnection(conf)
+  /* Start data channel */
+  sendChannel = cpc.createDataChannel("sendChannel");
+  sendChannel.onopen = () => {
+    console.log('client data channel on line')
+    sendChannel.onmessage = (message) => {
+      console.log(message.data)
+    }
+    sendChannel.send('Hi from the Client')
+  };
+  /* Start polling for ice candidate */
+
+
+  console.log(cpc.iceConnectionState)
+  cpc.oniceconnectionstatechange = () => {
+    console.log('iceConnectionState = ' + cpc.iceConnectionState)
+  }
+
+
+
+  cpc.onnegotiationneeded = () => {
+    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 pollServer(window.location, offer, pollServerForAnswer)
+    }).then((serverResponse) => {
+      const answer = JSON.parse(serverResponse)
+      console.log('Client: received host answer')
+      cpc.setRemoteDescription(answer.sdp).then(() => {
+        console.log('Client: Polling for ICE candidates')
+        pollServerForICECandidate(cpc)
+      })
+      cpc.onicecandidate = (event) => {
+        if (event.candidate) {
+          console.log('Client: Sending ice candidate to host')
+          postServer(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)
+    })
+  }
+})