Add support for coturn authentication

.gitignore

@@ -4,3 +4,4 @@ dist/
 node_modules/
 config.js
 coverage/
+config/local.json

config/default.json

@@ -0,0 +1,6 @@
+{
+    "iceServers": [{
+        "url": "stun:23.21.150.121",
+        "urls": "stun:23.21.150.121"
+    }]
+}

package.json

@@ -14,6 +14,7 @@
   "license": "MIT",
   "dependencies": {
     "bluebird": "^3.3.4",
+    "config": "^1.26.1",
     "express": "^4.13.3",
     "flux": "^2.1.1",
     "jade": "^1.11.0",

src/client/__mocks__/iceServers.js

@@ -0,0 +1 @@
+module.exports = [];

src/client/iceServers.js

@@ -0,0 +1,3 @@
+module.exports = JSON.parse(
+  window.document.getElementById('iceServers').value
+);

src/client/peer/peers.js

@@ -2,6 +2,7 @@ const _ = require('underscore');
 const Peer = require('./Peer.js');
 const debug = require('debug')('peer-calls:peer');
 const dispatcher = require('../dispatcher/dispatcher.js');
+const iceServers = require('../iceServers.js');
 const notify = require('../action/notify.js');
 
 let peers = {};
@@ -25,17 +26,7 @@ function create({ socket, user, initiator, stream }) {
   let peer = peers[user.id] = Peer.init({
     initiator: socket.id === initiator,
     stream,
-    config: {
+    config: { iceServers }
-      iceServers: [{
-        url: 'stun:23.21.150.121',
-        urls: 'stun:23.21.150.121'
-      }, {
-        url: 'turn:numb.viagenie.ca',
-        urls: 'turn:numb.viagenie.ca',
-        credential: 'muazkh',
-        username: 'webrtc@live.com'
-      }]
-    }
   });
 
   peer.once('error', err => {

src/server/__tests__/turn-test.js

@@ -0,0 +1,53 @@
+jest.unmock('../turn.js');
+const turn = require('../turn.js');
+
+describe('turn', () => {
+
+  describe('getCredentials', () => {
+
+    it('returns username & credential', () => {
+      const auth = turn.getCredentials('a', 'b');
+      expect(auth).toEqual(jasmine.any(Object));
+      expect(auth.username).toEqual(jasmine.any(String));
+      expect(auth.credential).toEqual(jasmine.any(String));
+    });
+
+  });
+
+  describe('processServers', () => {
+
+    const servers = [{
+      url: 'server1',
+      urls: 'server1',
+      username: 'a',
+      credential: 'b'
+    }, {
+      url: 'server2',
+      urls: 'server2',
+      username: 'c',
+      secret: 'd',
+      auth: 'secret'
+    }]
+
+    it('does not expose secret', () => {
+      const s = turn.processServers(servers);
+      expect(s.length).toBe(2);
+      expect(s[0]).toBe(servers[0]);
+      expect(s[1]).toEqual({
+        url: 'server2',
+        urls: 'server2',
+        username: jasmine.any(String),
+        credential: jasmine.any(String)
+      });
+      expect(s[1].username).toMatch(/^[0-9]+:c$/);
+    })
+
+    it('throws error when unknown auth type', () => {
+      expect(() => turn.processServers([{ auth: 'bla' }]))
+      .toThrowError(/not implemented/);
+    });
+
+  });
+
+});
+

src/server/routes/call.js

@@ -1,8 +1,12 @@
 #!/usr/bin/env node
 'use strict';
+const config = require('config');
+const turn = require('../turn.js');
 const router = require('express').Router();
 const uuid = require('uuid');
 
+const cfgIceServers = config.get('iceServers');
+
 router.get('/', (req, res) => {
   let prefix = 'call/';
   if (req.originalUrl.charAt(req.originalUrl.length - 1) === '/') prefix = '';
@@ -10,8 +14,10 @@ router.get('/', (req, res) => {
 });
 
 router.get('/:callId', (req, res) => {
+  const iceServers = turn.processServers(cfgIceServers);
   res.render('call', {
-    callId: encodeURIComponent(req.params.callId)
+    callId: encodeURIComponent(req.params.callId),
+    iceServers
   });
 });
 

src/server/turn.js

@@ -0,0 +1,35 @@
+'use strict';
+const crypto = require('crypto');
+
+function getCredentials(name, secret) {
+  // this credential would be valid for the next 24 hours
+  const timestamp = parseInt(Date.now() / 1000, 10) + 24 * 3600;
+  const username = [timestamp, name].join(':');
+  const hmac = crypto.createHmac('sha1', secret);
+  hmac.setEncoding('base64');
+  hmac.write(username);
+  hmac.end();
+  const credential = hmac.read();
+  return { username, credential };
+}
+
+function processServers(iceServers) {
+  return iceServers.map(server => {
+    switch (server.auth) {
+      case undefined:
+        return server;
+      case 'secret':
+        const cred = getCredentials(server.username, server.secret);
+        return {
+          url: server.url,
+          urls: server.urls,
+          username: cred.username,
+          credential: cred.credential
+        };
+      default:
+        throw new Error('Authentication type not implemented: ' + server.auth);
+    }
+  });
+}
+
+module.exports = { getCredentials, processServers };

src/views/call.jade

@@ -12,6 +12,7 @@ html
 
   body.call
     input#callId(type="hidden" value="#{callId}")
+    input#iceServers(type="hidden" value="#{JSON.stringify(iceServers)}")
 
     div#container