Use the Twilio STUN/TURN service.

lib/ice.js

@@ -0,0 +1,34 @@
+var twilio = require('twilio')
+var winston = require('winston')
+
+if (process.env.TWILIO_SID && process.env.TWILIO_TOKEN) {
+  var client = twilio(process.env.TWILIO_SID, process.env.TWILIO_TOKEN)
+} else {
+  var client = null
+}
+
+var CACHE_LIFETIME = 5 * 60 * 1000 // 5 minutes
+var cachedPromise = null
+
+function clearCache() {
+  cachedPromise = null
+}
+
+exports.getICEServers = function () {
+  if (client == null) return Promise.resolve({})
+  if (cachedPromise) return cachedPromise
+
+  cachedPromise = new Promise(function (resolve, reject) {
+    client.tokens.create({}, function(err, token) {
+      if (err) {
+        winston.error(err.message)
+        return resolve({})
+      }
+
+      setTimeout(clearCache, CACHE_LIFETIME)
+      resolve(token.ice_servers)
+    })
+  })
+
+  return cachedPromise
+}

lib/server.js

@@ -1,11 +1,12 @@
 var db = require('./db')
 var express = require('express')
+var expressWinston = require('express-winston')
 var fs = require('fs')
 var http = require('http')
+var ice = require('./ice')
 var path = require('path')
 var socketIO = require('socket.io')
 var winston = require('winston')
-var expressWinston = require('express-winston')
 
 var app = express()
 var server = http.Server(app)
@@ -62,6 +63,12 @@ io.on('connection', function (socket) {
     })
   })
 
+  socket.on('rtcConfig', function (_, res) {
+    ice.getICEServers().then(function (iceServers) {
+      res({ iceServers: iceServers })
+    })
+  })
+
   socket.on('disconnect', function () {
     db.remove(upload)
   })

lib/stores/DownloadStore.js

@@ -1,7 +1,7 @@
 import DownloadActions from '../actions/DownloadActions'
-import webtorrent from '../webtorrent'
 import alt from '../alt'
 import socket from 'filepizza-socket'
+import { getClient } from '../wt'
 
 const SPEED_REFRESH_TIME = 2000
 
@@ -34,7 +34,8 @@ export default alt.createStore(class DownloadStore {
     if (this.status !== 'ready') return
     this.status = 'requesting'
 
-    webtorrent.download(this.infoHash, (torrent) => {
+    getClient().then((client) => {
+      client.download(this.infoHash, (torrent) => {
         this.setState({ status: 'downloading' })
 
         const updateSpeed = () => {
@@ -66,6 +67,7 @@ export default alt.createStore(class DownloadStore {
 
         })
       })
+    })
   }
 
 }, 'DownloadStore')

lib/stores/UploadStore.js

@@ -1,7 +1,7 @@
 import UploadActions from '../actions/UploadActions'
 import alt from '../alt'
 import socket from 'filepizza-socket'
-import webtorrent from '../webtorrent'
+import { getClient } from '../wt'
 
 const SPEED_REFRESH_TIME = 2000
 
@@ -24,7 +24,8 @@ export default alt.createStore(class UploadStore {
     if (this.status !== 'ready') return
     this.status = 'processing'
 
-    webtorrent.seed(file, (torrent) => {
+    getClient().then((client) => {
+      client.seed(file, (torrent) => {
 
         const updateSpeed = () => {
           this.setState({
@@ -54,6 +55,7 @@ export default alt.createStore(class UploadStore {
         })
 
       })
+    })
   }
 
 }, 'UploadStore')

lib/webtorrent.js

@@ -1,3 +0,0 @@
-import WebTorrent from 'webtorrent'
-
-export default new WebTorrent({})

lib/wt.js

@@ -0,0 +1,11 @@
+import WebTorrent from 'webtorrent'
+import socket from 'filepizza-socket'
+
+export function getClient() {
+  return new Promise((resolve, reject) => {
+    socket.emit('rtcConfig', {}, (rtcConfig) => {
+      const client = new WebTorrent({ rtcConfig: rtcConfig })
+      resolve(client)
+    })
+  })
+}

package.json

@@ -36,6 +36,7 @@
     "socket.io": "^1.3.5",
     "socket.io-client": "^1.3.5",
     "stylus": "^0.50.0",
+    "twilio": "^2.3.0",
     "webrtcsupport": "^2.1.2",
     "webtorrent": "^0.56.0",
     "winston": "^1.0.1",