webp2p/dist/WebP2P.js

The server-less signaling channel for WebRTC

!function(e){if("object"==typeof exports&&"undefined"!=typeof module)module.exports=e();else if("function"==typeof define&&define.amd)define([],e);else{var f;"undefined"!=typeof window?f=window:"undefined"!=typeof global?f=global:"undefined"!=typeof self&&(f=self),f.WebP2P=e()}}(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);throw new Error("Cannot find module '"+o+"'")}var f=n[o]={exports:{}};t[o][0].call(f.exports,function(e){var n=t[o][1][e];return s(n?n:e)},f,f.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(_dereq_,module,exports){
(function (process){
var EventEmitter = _dereq_("events").EventEmitter;

var inherits = _dereq_('inherits');
var freeice  = _dereq_('freeice');
var uuid     = _dereq_('uuid');
var wrtc     = _dereq_('wrtc');

var RTCPeerConnection     = wrtc.RTCPeerConnection;
var RTCSessionDescription = wrtc.RTCSessionDescription;

_dereq_("process-events-shim");

var RpcBuilder = _dereq_('rpc-builder');

var HandshakeManager = _dereq_('./managers/HandshakeManager');
var PeersManager     = _dereq_('./managers/PeersManager');

var packer = _dereq_('./packer');


const MAX_TTL_DEFAULT = 5;


function noop(error)
{
  if(error) console.error(error);
};



/**
 * @classdesc Init and connect to the WebP2P.io network
 *
 * @constructor
 */
function WebP2P(options)
{
  var self = this;


  options = options || {};

  // Internal options
  var commonLabels      = options.commonLabels || [];
  var handshake_servers = options.handshake_servers;
  var iceServers        = freeice(options.iceServers);

  // Read-only options
  Object.defineProperty(this, "routingLabel",
  {
    value: options.routingLabel || "webp2p"
  });
  Object.defineProperty(this, "sessionID",
  {
    value: options.sessionID || uuid.v4()
  });


  var options =
  {
    max_retries: 3,
    peerID: this.sessionID
  };

  var rpcBuilder = new RpcBuilder(packer, options);

  var handshakeManager = new HandshakeManager(rpcBuilder, handshake_servers);
  var peersManager     = new PeersManager(rpcBuilder, self.routingLabel);

  this.__defineGetter__('status', function()
  {
    if(peersManager.status == 'connected')
      return 'connected';

    return handshakeManager.status;
  });

  this.__defineGetter__("peers", function()
  {
    return peersManager.peers;
  });


  function onerror(error)
  {
    self.emit('error', new Error(error));
  };


  var offers = {};

  /**
   * Create a new RTCPeerConnection
   * @param {UUID} sessionID Identifier of the other peer so later can be accessed.
   *
   * @return {RTCPeerConnection}
   */
  function createPeerConnection(sessionID, callbackType, callback)
  {
    var pc = new RTCPeerConnection
    (
      {iceServers: iceServers},
      {optional: [{DtlsSrtpKeyAgreement: true}]}
    );

    pc.addEventListener('icecandidate', function(event)
    {
      // There's a candidate, ignore it
      if(event.candidate) return;

      // There's no candidate, send the full SDP
      var type = this.localDescription.type;
      var sdp  = this.localDescription.sdp;

      if(type == callbackType)
        callback(sdp)
      else
        console.error(type+" SDP type is not equal to "+callbackType+" callback type");
    });

    pc.addEventListener('signalingstatechange', function(event)
    {
      // Add PeerConnection object to available ones when gets open
      if(pc.signalingState == 'stable')
      {
        var channels = pc._channels || [];

        peersManager.add(sessionID, pc, channels);

        var offer = offers[sessionID];
        if(offer)
        {
          delete offers[sessionID];

          offer.callback(null, pc, channels);
        };

        self.emit('peerconnection', pc, channels);
      };
    });

    // Set ID of the PeerConnection
    Object.defineProperty(pc, "sessionID", {value : sessionID});

    return pc;
  };


  //
  // Connection methods
  //

  /**
   * Callback to send the offer. If not defined send it to all connected peers.
   *
   * @callback WebP2P~ConnectToCallback
   * @param {Error} error
   * @param {RTCPeerConnection} peer - The (newly created) peer
   */

  /**
   * Connects to another peer based on its UID. If we are already connected,
   * it does nothing.
   *
   * @param {UUID} sessionID - Identifier of the other peer to be connected.
   * @param {string[]} [labels] - Per-connection labels
   * @param {WebP2P~ConnectToCallback} callback
   */
  this.connectTo = function(dest, labels, callback)
  {
    if(labels instanceof Function)
    {
      if(callback)
        throw new SyntaxError("Nothing can be defined after the callback");

      callback = labels;
      labels = undefined;
    };

    // Don't connect to ourself
    if(dest == self.sessionID)
      return callback(new Error("Connecting to ourself"));

    // Check if we are already connected to the requested peer
    var pc = peersManager.get(dest);
    if(pc)
    {
      // We are already connected to that peer, ignore the request
      var message = "["+self.sessionID+"] Already connected to "+dest;
      console.log(message);

      // [ToDo] AddChannels(pc, labels);

      var channels = pc._channels || [];

      callback(null, pc, channels);

      return;
    };

    // Check if we are already trying to connect to that peer
    var offer = offers[dest];
    if(offer)
    {
      // We are already trying to connect to that peer, ignore the request
      var message = "["+self.sessionID+"] Already requested connection to "+dest;
      console.log(message);

      var pc = offer.peerConnection;

      // [ToDo] AddChannels(pc, labels);

      pc.addEventListener('signalingstatechange', function(event)
      {
        if(pc.signalingState == 'stable')
        {
          var channels = pc._channels || [];

          callback(null, pc, channels);
        }
      });

      return;
    };

    // Request to connect to a new peer, generate the offer
    generateOffer(dest, [handshakeManager, peersManager], labels, callback);
  };


  //
  // Managers
  //

  function forward(message, connector)
  {
    var from = message.from;
    var dest = message.dest;

    // Message was for us, raise error
    if(dest == self.sessionID)
      return console.error('Ignored message send to us', message);

    // Don't forward the message if TTL has been achieved
    if(--message.ttl <= 0)
      return console.warn("TTL achieved:",message);

    var dest = message.dest;

    message = message.pack();

    // Search the peer between the ones currently connected so we can send the
    // message directly to it
    for(var i=0, peer; peer=peersManager._connectors[i]; i++)
      if(peer.sessionID == dest)
        return peer.send(message);

    // Peer was not found, forward message to all the connectors except the one
    // where we received it
    peersManager.send(message, connector);
    handshakeManager.send(message, connector);
  };


  handshakeManager.on('connected', function()
  {
    self.emit('handshakeManager.connected', handshakeManager);
  });
  handshakeManager.on('disconnected', function()
  {
    self.emit('handshakeManager.disconnected', handshakeManager);
  });

  peersManager.on('connected', function()
  {
    self.emit('peersManager.connected', peersManager);
  });
  peersManager.on('disconnected', function()
  {
    self.emit('peersManager.disconnected', peersManager);
  });


  /**
   * Check if it's a request from a peer we are already connected or trying to
   * connect to, so we can prevent to do crossed connections
   *
   * @param from - ID of the other peer
   *
   * @returns {Boolean} - If we are already connected or trying to connect
   */
  function connectionProcessed(from)
  {
    // Check if we are already connected to the requester peer
    var peer = peersManager.get(from);
    if(peer)
    {
      // [ToDo] AddChannels(peer, labels);

      // We are already connected to that peer, send an error to the other end
      var message = "["+self.sessionID+"] Already connected to "+from;
      console.log(message);

      var error =
      {
        code: -1,
        message: message,
        ttl: MAX_TTL_DEFAULT
      };
      return error;
    };

    // Check if we are already trying to connect to that peer
    var offer = offers[from];
    if(offer)
    {
      // [ToDo] AddChannels(offer.peerConnection, labels);

      // We are already trying to connect to that peer, ignore the request
      var message = "["+self.sessionID+"] Already requested connection to "+from;
      console.log(message);

      // We have higher precedence, send an error to the other end
      if(self.sessionID < from)
      {
        console.log("["+self.sessionID+"] Higher precedence than "+from+", sending error");

        var error =
        {
          code: -2,
          message: message,
          ttl: MAX_TTL_DEFAULT
        };
        return error;
      }

      // We have less precedence, cancel our connection request and prepare to use the
      // incoming one with the previous callback
      delete offers[from];

      rpcBuilder.cancel(offer.message);
      offer.peerConnection.close();

      console.debug("["+self.sessionID+"] Lower precedence than "+from+", request canceled");

      return offer.callback;
    };

    // Connection request is a genuinely new one, process it as usual
  };


    //
    // Protocol messages
    //

  function onpresence(from, connector)
  {
    // Check if we are already connected to the new peer
    var peer = peersManager.get(from);
    if(peer) return;

    // Check if we are already trying to connect to the new peer
    var offer = offers[from];
    if(offer) return;

    var pc = generateOffer(from, connector);

    pc.addEventListener('signalingstatechange', function(event)
    {
      // If PeerConnection object gets open, increase number of connections
      // fetch over this connector so it can decide if it could close
      if(pc.signalingState == 'stable')
        connector.increaseConnections();
    });
  };

  function onoffer(request, connector)
  {
    var from = request.from;
    var dest = request.dest;

    // Message is for us
    if(dest == self.sessionID)
    {
      console.log("["+dest+"] Received connection request from "+from);

      // If connection is already processed, send an error to the other end
      var processed = connectionProcessed(from);
      if(processed && processed.code)
        return request.reply(processed);

      // Search the peer between the list of currently connected ones,
      // or create it if it's not connected
      var pc = createPeerConnection(from, "answer", function(answer)
      {
        var response =
        {
          sdp: answer,
          ttl: MAX_TTL_DEFAULT
        };

        // Send back the connection request over the same connector, since
        // this should be the shortest path to connect both peers
        request.reply(null, response);
      });

      // Process offer & generate answer
      pc.setRemoteDescription(new RTCSessionDescription(
      {
        sdp:  request.sdp,
        type: 'offer'
      }),
      function()
      {
        pc.createAnswer(function(answer)
        {
          pc.setLocalDescription(answer, null, onerror);
        },
        onerror)
      },
      onerror);

      if(processed)
        pc.addEventListener('signalingstatechange', function(event)
        {
          if(pc.signalingState == 'stable')
          {
            var channels = pc._channels || [];

            processed(null, pc, channels);
          }
        });

      pc.addEventListener('datachannel', function(event)
      {
        var channel = event.channel;

        var channels = pc._channels || [];

        channels.push(channel);

        pc._channels = channels;
      });
    }

    // Forward message
    else
      forward(request, connector);
  };


  function generateOffer(dest, connector, labels, callback)
  {
    var pc = createPeerConnection(dest, "offer", function(offer)
    {
      var message =
      {
        sdp: offer,
        ttl: callback ? MAX_TTL_DEFAULT : 1
      };

      callback = callback || noop;

      var request = rpcBuilder.encode('offer', message, dest,
      function(error, result)
      {
        if(error) return callback(error);

        processAnswer(result);
      });

      offers[dest] =
      {
        callback: callback,
        message: request,
        peerConnection: pc
      };

      if(connector instanceof Array)
        connector.forEach(function(c)
        {
          c.send(request);
        });

      // Send back the connection request over the same connector, since this
      // should be the shortest path to connect both peers
      else
        connector.send(request);
    });

    //
    // Init PeerConnection
    //

    // Set channels for this PeerConnection object
    labels = [self.routingLabel].concat(commonLabels, labels);

    var channels = pc._channels = [];

    for(var i=0, label; label=labels[i]; i++)
    {
      var channel = pc.createDataChannel(label);

      channels.push(channel);

      channel.addEventListener('close', function(event)
      {
        channels.splice(channels.indexOf(channel), 1);
      });
    };

    // Send offer
    var mediaConstraints =
    {
      mandatory:
      {
        OfferToReceiveAudio: false,
        OfferToReceiveVideo: false
      }
    };

    pc.createOffer(function(offer)
    {
      pc.setLocalDescription(offer, null, onerror);
    },
    onerror,
    mediaConstraints);

    return pc;
  };

  function processAnswer(response)
  {
    var from = response.from;

    console.debug('['+self.sessionID+'] Received answer from '+from);

    var offer = offers[from];
    if(offer)
      offer.peerConnection.setRemoteDescription(new RTCSessionDescription(
      {
        sdp:  response.sdp,
        type: 'answer'
      }),
      null, onerror);
    else
      console.warn("["+self.sessionID+"] Connection with peer '" + from + "' was not previously requested");
  };


    //
    // Manager events
    //

  function initManagerEvents(manager)
  {
    manager.on('connected', function()
    {
      if(handshakeManager.status != peersManager.status)
        self.emit('connected');
    });
    manager.on('disconnected', function()
    {
      if(handshakeManager.status == peersManager.status)
        self.emit('disconnected');
    });
//    manager.on('error', onerror);

    manager.on('offer',  onoffer);
    manager.on('answer', forward);
    manager.on('error',  forward);
  };

  // Init managers events

  initManagerEvents(handshakeManager);
  initManagerEvents(peersManager);

  handshakeManager.on('presence', onpresence);


  //
  // Clossing functions
  //

  this.close = function()
  {
    handshakeManager.close();
    peersManager.close();

    rpcBuilder.close();
  };

  // Close all connections when user goes out of the page or app is clossed
  process.on('exit', function(code)
  {
    self.close();
  });
};
inherits(WebP2P, EventEmitter);


module.exports = WebP2P;

}).call(this,_dereq_("FWaASH"))
},{"./managers/HandshakeManager":9,"./managers/PeersManager":11,"./packer":12,"FWaASH":24,"events":17,"freeice":46,"inherits":56,"process-events-shim":57,"rpc-builder":59,"uuid":65,"wrtc":66}],2:[function(_dereq_,module,exports){
var inherits = _dereq_("inherits");

var HandshakeConnector = _dereq_("./core/HandshakeConnector");

var PUBNUB = _dereq_("pubnub");


/**
 * Handshake connector for PubNub
 * @param {Object} configuration Configuration object.
 */
function Connector_PubNub(config_init, config_mess, max_connections)
{
  HandshakeConnector.call(this, max_connections);

  var self = this;

  var channel = config_mess.channel;


  // Connect a handshake connector to the PubNub server
  var pubnub = PUBNUB.init(config_init);

  // Configure handshake connector
  pubnub.subscribe(
  {
    channel: channel,
    restore: false,
    backfill: false,

    connect:    self._open,
    message:    self._message,
    disconnect: self._close,

    error: function(response)
    {
      self._error(new Error(response ? response.error : 'Undefined error'))
    }
  });


  // Define methods

  /**
   * Close the connection with this handshake server
   */
  this.close = function()
  {
    pubnub.unsubscribe(
    {
      channel: channel
    });

    // This shouldn't be necesary, but seems 'disconnect' event is not being
    // dispatched by the PubNub channel, so we close the connector explicitly
    self._close();
  }

  /**
   * Send the message
   */
  this.send = function(message)
  {
    pubnub.publish(
    {
      channel: channel,
      message: message
    });
  };
}
inherits(Connector_PubNub, HandshakeConnector);


// Class constants
Connector_PubNub.prototype.max_connections = 50;
Object.defineProperty(Connector_PubNub.prototype, 'max_chars', {value: 1800});


module.exports = Connector_PubNub;

},{"./core/HandshakeConnector":5,"inherits":56,"pubnub":67}],3:[function(_dereq_,module,exports){
var inherits = _dereq_("inherits");

var EventEmitter = _dereq_("events").EventEmitter;


function Connector()
{
  EventEmitter.call(this);

  var self = this;


  /**
   * Notify that the connection to this handshake server is open
   */
  this._open = function()
  {
    self.emit('open');
  };

  this._message = function(message)
  {
    self.emit("message", message);
  };

  this._close = function()
  {
    self.emit('close');
  };

  this._error = function(error)
  {
    self.emit('error', error);
  };
};
inherits(Connector, EventEmitter);


Connector.prototype.close = function()
{
  throw new TypeError("Connector.close should be defined in a child class");
};
Connector.prototype.send = function(message)
{
  throw new TypeError("Connector.send should be defined in a child class");
};


module.exports = Connector;

},{"events":17,"inherits":56}],4:[function(_dereq_,module,exports){
var inherits = _dereq_("inherits");

var Connector = _dereq_("./Connector");


function Connector_DataChannel(datachannel)
{
  Connector.call(this);

  var self = this;


  datachannel.addEventListener('open',  self._open);
  datachannel.addEventListener('message', function(event)
  {
    self._message(event.data);
  });
  datachannel.addEventListener('close', self._close);
  datachannel.addEventListener('error', self._error);


  // Define methods

  /**
   * Close the connection with the peer
   */
  this.close = function()
  {
    datachannel.close();
  };

  /**
   * Send the message
   */
  this.send = function(message)
  {
    datachannel.send(message);
  };
};
inherits(Connector_DataChannel, Connector);


module.exports = Connector_DataChannel;

},{"./Connector":3,"inherits":56}],5:[function(_dereq_,module,exports){
var inherits = _dereq_("inherits");

var Connector = _dereq_("./Connector");


function HandshakeConnector(max_connections)
{
  Connector.call(this);

  var self = this;


  if(max_connections != undefined)
    this.max_connections = Math.min(max_connections, this.max_connections);

  /**
   * Check if we should connect this new peer or ignore it to increase entropy
   * in the network mesh
   *
   * @returns {Boolean}
   */
  this.shouldConnect = function()
  {
    return true;
  };


  // Count the maximum number of pending connections allowed to be
  // done with this handshake server (undefined == unlimited)
  var connections = 0;

  this.increaseConnections = function()
  {
    // Increase the number of connections reached throught
    // this handshake server
    connections++;

    // Close connection with handshake server if we got its quota of peers
    if(connections >= self.max_connections)
       self.close();
  };
};
inherits(HandshakeConnector, Connector);


// Class constants
HandshakeConnector.prototype.max_connections = Number.POSITIVE_INFINITY;


module.exports = HandshakeConnector;

},{"./Connector":3,"inherits":56}],6:[function(_dereq_,module,exports){
var inherits = _dereq_('inherits');

var HandshakeConnector = _dereq_("./core/HandshakeConnector");

var ortcNodeclient = _dereq_('ibtrealtimesjnode').IbtRealTimeSJNode;


/**
 * Handshake connector for xRTML
 * @param {Object} configuration Configuration object
 */
function Connector_xRTML(config_init, config_mess, max_connections)
{
  HandshakeConnector.call(this, max_connections);

  var self = this;

  var channel = config_mess.channel;

  // Create ORTC client
  var ortcClient = new ortcNodeclient();

  ortcClient.setClusterUrl('http://ortc-developers.realtime.co/server/2.1/');

  ortcClient.onConnected = function(ortc)
  {
    ortcClient.subscribe(channel, true, function(ortc, channel, message)
    {
      self._message(message);
    });
  };

  ortcClient.onSubscribed   = this._open.bind(this);
  ortcClient.onUnsubscribed = this._close.bind(this);

  ortcClient.onException = function(ortc, exception)
  {
    self._error(exception);
  };

  // Connect a handshake connector to the xRTML server
  ortcClient.connect(config_init.application_key, config_init.authentication_token);


  // Define methods

  /**
   * Close the connection with this handshake server
   */
  this.close = function()
  {
    ortcClient.unsubscribe(channel);
  };

  /**
   * Send the message
   */
  this.send = function(message)
  {
    ortcClient.send(channel, message);
  };
}
inherits(Connector_xRTML, HandshakeConnector);


module.exports = Connector_xRTML;

},{"./core/HandshakeConnector":5,"ibtrealtimesjnode":51,"inherits":56}],7:[function(_dereq_,module,exports){
const ERROR_NETWORK_UNKNOWN = {id: 0, msg: 'Unable to fetch handshake servers configuration'};
const ERROR_NETWORK_OFFLINE = {id: 1, msg: "There's no available network"};
const ERROR_REQUEST_FAILURE = {id: 2, msg: 'Unable to fetch handshake servers configuration'};
const ERROR_REQUEST_EMPTY   = {id: 3, msg: 'Handshake servers configuration is empty'};

const ERROR_NO_PEERS        = {id: 4, msg: 'Not connected to any peer'};


exports.ERROR_NETWORK_UNKNOWN = ERROR_NETWORK_UNKNOWN;
exports.ERROR_NETWORK_OFFLINE = ERROR_NETWORK_OFFLINE;
exports.ERROR_REQUEST_FAILURE = ERROR_REQUEST_FAILURE;
exports.ERROR_REQUEST_EMPTY   = ERROR_REQUEST_EMPTY;
exports.ERROR_NO_PEERS        = ERROR_NO_PEERS;
},{}],8:[function(_dereq_,module,exports){
/**
 * New node file
 */
var HandshakeConnector = _dereq_('./connectors/core/HandshakeConnector');
var WebP2P             = _dereq_('./WebP2P');


module.exports = WebP2P;
module.exports.HandshakeConnector = HandshakeConnector;
},{"./WebP2P":1,"./connectors/core/HandshakeConnector":5}],9:[function(_dereq_,module,exports){
var inherits = _dereq_('inherits');

var Manager = _dereq_('./Manager');

var errors = _dereq_('../errors');


var Connector_PubNub = _dereq_('../connectors/PubNub');
var Connector_xRTML  = _dereq_('../connectors/xRTML');


/**
 * Manage the handshake connectors using several servers
 *
 * @constructor
 * @param {String} json_uri URI of the handshake servers configuration.
 */
function HandshakeManager(rpcBuilder, handshake_servers)
{
  Manager.call(this, rpcBuilder);

  var self = this;


  var handshakeConnectorConstructors = {};

  this.registerConnectorConstructor = function(type, constructor)
  {
    handshakeConnectorConstructors[type] = constructor
  };


  // Default handshake connectors
  this.registerConnectorConstructor('PubNub', Connector_PubNub);
  this.registerConnectorConstructor('xRTML',  Connector_xRTML);


  function createConnector(config)
  {
    var type            = config.type;
    var config_init     = config.config_init;
    var config_mess     = config.config_mess;
    var max_connections = config.max_connections;

    // Check if connector constructor is from a valid handshake server
    var connectorConstructor = handshakeConnectorConstructors[type];
    if(!connectorConstructor)
      throw Error("Invalid handshake server type '" + type + "'");

    var connector = new connectorConstructor(config_init, config_mess, max_connections);

    self._initConnector(connector);

    connector.on('open', function()
    {
      // Notify our presence to the other peers
      connector.send(rpcBuilder.encode('presence'));
    });

    var _messageUnpacked = connector._messageUnpacked;
    connector._messageUnpacked = function(message)
    {
      if(message.method == 'presence')
      {
        if(connector.shouldConnect())
          self.emit("presence", message.params.from, connector);
      }
      else
        _messageUnpacked.call(connector, message);
    };

    return connector;
  };


  var configs = [];
  var index = 0;

  var configs_infinity = [];

  /**
   * Get a random handshake connector or test for the next one
   * @param {Object} configuration Handshake servers configuration.
   */
  function handshake()
  {
    if(!configs.length)
      throw Error('No handshake servers defined')

    for(; index < configs.length; index++)
    {
      var connector = createConnector(configs[index]);
          connector.on('close', function()
      {
        // Handshake connector has been closed, try to get an alternative one
        index++;
        handshake();
      });

      // Connector successfully created
      return;
    };

    // All configured handshake servers has been consumed
    // Get ready to start again from beginning of handshake servers list
    index = 0;
  };


  this.addConfigs_byObject = function(config)
  {
    // Check if connector constructor is from a valid handshake server
    var connectorConstructor = handshakeConnectorConstructors[config.type];
    if(!connectorConstructor)
      return console.error("Invalid handshake server config: ", config);

    if(connectorConstructor.prototype.max_connections == Number.POSITIVE_INFINITY
    && !config.max_connections)
    {
      configs_infinity.push(config)

      // Start handshaking
      createConnector(config);
    }
    else
    {
      configs.push(config);

      // Start handshaking
      if(self.status == 'disconnected')
        handshake();
    }
  };


  // Add handshake servers configuration
  if(handshake_servers)
    this.addConfigs(handshake_servers)
};
inherits(HandshakeManager, Manager);


HandshakeManager.prototype.addConfigs = function(configuration)
{
  if(typeof configuration == 'string')
    return this.addConfigs_byUri(configuration);

  if(configuration instanceof Array)
    return this.addConfigs_byArray(configuration);

  this.addConfigs_byObject(configuration);
};

HandshakeManager.prototype.addConfigs_byArray = function(configuration)
{
  for(var i=0, config; config=configuration[i]; i++)
    this.addConfigs_byObject(config);
};

HandshakeManager.prototype.addConfigs_byUri = function(json_uri)
{
  var self = this;

  function dispatchError(error)
  {
    self.emit('error', error);
  };

  // Request the handshake servers configuration file
  var http_request = new XMLHttpRequest();

  http_request.open('GET', json_uri);
  http_request.onload = function(event)
  {
    if(this.status == 200)
    {
      var configuration = JSON.parse(http_request.response);

      // We got some config entries
      if(configuration.length)
        self.addConfigs_byArray(configuration)

      // Config was empty
      else
        dispatchError(errors.ERROR_REQUEST_EMPTY)
    }

    // Request returned an error
    else
      dispatchError(errors.ERROR_REQUEST_FAILURE)
  };

  // Connection error
  http_request.onerror = function(event)
  {
    dispatchError(navigator.onLine ? errors.ERROR_NETWORK_UNKNOWN
                                   : errors.ERROR_NETWORK_OFFLINE)
  };

  http_request.send();
};


module.exports = HandshakeManager;

},{"../connectors/PubNub":2,"../connectors/xRTML":6,"../errors":7,"./Manager":10,"inherits":56}],10:[function(_dereq_,module,exports){
var EventEmitter = _dereq_("events").EventEmitter;

var inherits = _dereq_('inherits');


function Manager(rpcBuilder)
{
  EventEmitter.call(this);

  var self = this;


  this._connectors = [];

  this.__defineGetter__("status", function()
  {
    return this._connectors.length ? 'connected' : 'disconnected';
  });


  this._initConnector = function(connector)
  {
    connector.on('open', function()
    {
//      for(var i=0, conn; conn=self._connectors[i]; i++)
//        if(conn===connector)
//          console.error('Duplicate connector',connector);

      self._connectors.push(connector);

      if(self._connectors.length == 1)
         self.emit('connected');
    });
    connector.on('close', function()
    {
      self._connectors.splice(self._connectors.indexOf(connector), 1);

      if(self._connectors.length == 0)
         self.emit('disconnected');
    });
    connector.on('error', function(error)
    {
      connector.close();

      self.emit('error', error);
    });

    connector._messageUnpacked = function(message)
    {
      var method = message.method;
      var params = message.params;

      switch(method)
      {
        case 'offer':
          params.reply = function(error, result)
          {
            return message.reply(error, result, connector);
          };

        case 'answer':
        case 'error':
          params.pack = function()
          {
            return message.pack();
          };

          self.emit(method, params, connector);
        break;

        default:
          // This should never be reached
          console.error("Unknown message method '"+method+"'", message);
      };
    };

    connector.on('message', function(message)
    {
      message = rpcBuilder.decode(message);
      if(message)
      {
        // Response was previously stored, send it directly
        if(message.stored)
          connector.send(message)

        // Normal message, process it
        else
          connector._messageUnpacked(message);
      };
    });
  };
};
inherits(Manager, EventEmitter);


/**
 * Close all the connections
 */
Manager.prototype.close = function()
{
  for(var i=0, connector; connector=this._connectors[i]; i++)
    connector.close();
};

/**
 * {Object} message - Message to be send
 * {Connector} [incomingConnector] - {Connector} to don't send the message
 */
Manager.prototype.send = function(message, incomingConnector)
{
  for(var i=0, connector; connector=this._connectors[i]; i++)
  {
    // Don't send the message to the same connector where we received it
    if(connector === incomingConnector)
      continue;

    connector.send(message);
  };
};


module.exports = Manager;

},{"events":17,"inherits":56}],11:[function(_dereq_,module,exports){
var inherits = _dereq_('inherits');

var Manager = _dereq_('./Manager');

var Connector_DataChannel = _dereq_('../connectors/core/DataChannel');


/**
 * @classdesc Manager of the communications with the other peers
 *
 * @constructor
 */
function PeersManager(rpcBuilder, routingLabel)
{
  Manager.call(this, rpcBuilder);

  var self = this;


  function createConnector(channel)
  {
    var connector = new Connector_DataChannel(channel);

    self._initConnector(connector);

    return connector;
  };


  var peers = {};

  this.__defineGetter__("peers", function()
  {
    return peers;
  });


  function initDataChannel(channel, sessionID)
  {
    if(channel.label == routingLabel)
    {
      var connector = createConnector(channel);
          connector.sessionID = sessionID;

      return connector;
    };
  };

  this.add = function(sessionID, peerConnection, channels)
  {
    peerConnection.addEventListener('signalingstatechange', function(event)
    {
      // Remove the peer from the list of peers when gets closed
      if(peerConnection.signalingState == 'closed')
        delete peers[sessionID];
    });

    // Connection initiator
    if(channels.length)
    {
      // Only init the routing functionality on the routing channel
      for(var i=0, channel; channel=channels[i]; i++)
        if(initDataChannel(channel, sessionID))
          break;
    }

    // Connection receiver
    else
    {
      function initDataChannel_listener(event)
      {
        var channel = event.channel;

        var connector = initDataChannel(channel, sessionID);
        if(connector)
          event.target.removeEventListener('datachannel', initDataChannel_listener);
      };

      peerConnection.addEventListener('datachannel', initDataChannel_listener);
    };

    // Add PeerConnection to the list of enabled ones
    peers[sessionID] = peerConnection;
  };

  this.get = function(sessionID)
  {
    return peers[sessionID];
  };

  var _close = this.close;
  this.close = function()
  {
    for(var id in peers)
      peers[id].close();

    _close.call(this);
  };
};
inherits(PeersManager, Manager);


module.exports = PeersManager;

},{"../connectors/core/DataChannel":4,"./Manager":10,"inherits":56}],12:[function(_dereq_,module,exports){
const ERROR    = 0;
const PRESENCE = 1;
const OFFER    = 2;
const ANSWER   = 3;


function pack(message, id)
{
  var result = new Array(6);
  var params = message.params || {};

  // Method
  var method = message.method;
  switch(method)
  {
    case "error":
      result[0] = ERROR;
    break;

    case "presence":
      result[0] = PRESENCE;
    break;

    case "offer":
      result[0] = OFFER;
    break;

    case "answer":
      result[0] = ANSWER;
    break;

    default:
    {
      var error = new Error("Unknown message method '"+method+"'");
          error.message = message;

      throw error;
    };
  };

  // From
  result[1] = params.from;

  // Offer & Answer

  if(method != 'presence')
  {
    result[2] = params.dest;
    result[3] = id;
    result[4] = params.ttl;
    result[5] = params.sdp || params.message;
  };

  return JSON.stringify(result);
};

function unpack(message)
{
  var result = {};
  var params = {};

  message = JSON.parse(message);

  // Method
  var method = message[0];
  switch(method)
  {
    case ERROR:
      result.method = "error";
    break;

    case PRESENCE:
      result.method = "presence";
    break;

    case OFFER:
      result.method = "offer";
    break;

    case ANSWER:
      result.method = "answer";
    break;

    default:
    {
      var error = new Error("Unknown message method '"+method+"'");
          error.message = message;

      throw error;
    };
  };

  // From
  params.from = message[1];

  // Offer & Answer

  if(method != PRESENCE)
  {
    params.dest = message[2];

    if(method == ERROR || method == ANSWER)
      result.ack = message[3];
    else
      result.id = message[3];

    params.ttl  = message[4];

    if(method == ERROR)
      params.message = message[5];
    else
      params.sdp = message[5];
  };

  // Return unpacked message
  result.params = params;

  return result;
};


var responseMethods =
{
  'presence': 'offer',

  'offer':
  {
    error:    'error',
    response: 'answer'
  }
};


exports.pack   = pack;
exports.unpack = unpack;

exports.responseMethods = responseMethods;

},{}],13:[function(_dereq_,module,exports){

},{}],14:[function(_dereq_,module,exports){
/*!
 * The buffer module from node.js, for the browser.
 *
 * @author   Feross Aboukhadijeh <feross@feross.org> <http://feross.org>
 * @license  MIT
 */

var base64 = _dereq_('base64-js')
var ieee754 = _dereq_('ieee754')

exports.Buffer = Buffer
exports.SlowBuffer = Buffer
exports.INSPECT_MAX_BYTES = 50
Buffer.poolSize = 8192

/**
 * If `Buffer._useTypedArrays`:
 *   === true    Use Uint8Array implementation (fastest)
 *   === false   Use Object implementation (compatible down to IE6)
 */
Buffer._useTypedArrays = (function () {
  // Detect if browser supports Typed Arrays. Supported browsers are IE 10+, Firefox 4+,
  // Chrome 7+, Safari 5.1+, Opera 11.6+, iOS 4.2+. If the browser does not support adding
  // properties to `Uint8Array` instances, then that's the same as no `Uint8Array` support
  // because we need to be able to add all the node Buffer API methods. This is an issue
  // in Firefox 4-29. Now fixed: https://bugzilla.mozilla.org/show_bug.cgi?id=695438
  try {
    var buf = new ArrayBuffer(0)
    var arr = new Uint8Array(buf)
    arr.foo = function () { return 42 }
    return 42 === arr.foo() &&
        typeof arr.subarray === 'function' // Chrome 9-10 lack `subarray`
  } catch (e) {
    return false
  }
})()

/**
 * Class: Buffer
 * =============
 *
 * The Buffer constructor returns instances of `Uint8Array` that are augmented
 * with function properties for all the node `Buffer` API functions. We use
 * `Uint8Array` so that square bracket notation works as expected -- it returns
 * a single octet.
 *
 * By augmenting the instances, we can avoid modifying the `Uint8Array`
 * prototype.
 */
function Buffer (subject, encoding, noZero) {
  if (!(this instanceof Buffer))
    return new Buffer(subject, encoding, noZero)

  var type = typeof subject

  // Workaround: node's base64 implementation allows for non-padded strings
  // while base64-js does not.
  if (encoding === 'base64' && type === 'string') {
    subject = stringtrim(subject)
    while (subject.length % 4 !== 0) {
      subject = subject + '='
    }
  }

  // Find the length
  var length
  if (type === 'number')
    length = coerce(subject)
  else if (type === 'string')
    length = Buffer.byteLength(subject, encoding)
  else if (type === 'object')
    length = coerce(subject.length) // assume that object is array-like
  else
    throw new Error('First argument needs to be a number, array or string.')

  var buf
  if (Buffer._useTypedArrays) {
    // Preferred: Return an augmented `Uint8Array` instance for best performance
    buf = Buffer._augment(new Uint8Array(length))
  } else {
    // Fallback: Return THIS instance of Buffer (created by `new`)
    buf = this
    buf.length = length
    buf._isBuffer = true
  }

  var i
  if (Buffer._useTypedArrays && typeof subject.byteLength === 'number') {
    // Speed optimization -- use set if we're copying from a typed array
    buf._set(subject)
  } else if (isArrayish(subject)) {
    // Treat array-ish objects as a byte array
    for (i = 0; i < length; i++) {
      if (Buffer.isBuffer(subject))
        buf[i] = subject.readUInt8(i)
      else
        buf.writeInt8(subject[i], i)
    }
  } else if (type === 'string') {
    buf.write(subject, 0, encoding)
  } else if (type === 'number' && !Buffer._useTypedArrays && !noZero) {
    for (i = 0; i < length; i++) {
      buf[i] = 0
    }
  }

  return buf
}

// STATIC METHODS
// ==============

Buffer.isEncoding = function (encoding) {
  switch (String(encoding).toLowerCase()) {
    case 'hex':
    case 'utf8':
    case 'utf-8':
    case 'ascii':
    case 'binary':
    case 'base64':
    case 'raw':
    case 'ucs2':
    case 'ucs-2':
    case 'utf16le':
    case 'utf-16le':
      return true
    default:
      return false
  }
}

Buffer.isBuffer = function (b) {
  return !!(b !== null && b !== undefined && b._isBuffer)
}

Buffer.byteLength = function (str, encoding) {
  var ret
  str = str.toString()
  switch (encoding || 'utf8') {
    case 'hex':
      ret = str.length / 2
      break
    case 'utf8':
    case 'utf-8':
      ret = utf8ToBytes(str).length
      break
    case 'ascii':
    case 'binary':
    case 'raw':
      ret = str.length
      break
    case 'base64':
      ret = base64ToBytes(str).length
      break
    case 'ucs2':
    case 'ucs-2':
    case 'utf16le':
    case 'utf-16le':
      ret = str.length * 2
      break
    default:
      throw new Error('Unknown encoding')
  }
  return ret
}

Buffer.concat = function (list, totalLength) {
  assert(isArray(list), 'Usage: Buffer.concat(list[, length])')

  if (list.length === 0) {
    return new Buffer(0)
  } else if (list.length === 1) {
    return list[0]
  }

  var i
  if (totalLength === undefined) {
    totalLength = 0
    for (i = 0; i < list.length; i++) {
      totalLength += list[i].length
    }
  }

  var buf = new Buffer(totalLength)
  var pos = 0
  for (i = 0; i < list.length; i++) {
    var item = list[i]
    item.copy(buf, pos)
    pos += item.length
  }
  return buf
}

Buffer.compare = function (a, b) {
  assert(Buffer.isBuffer(a) && Buffer.isBuffer(b), 'Arguments must be Buffers')
  var x = a.length
  var y = b.length
  for (var i = 0, len = Math.min(x, y); i < len && a[i] === b[i]; i++) {}
  if (i !== len) {
    x = a[i]
    y = b[i]
  }
  if (x < y) {
    return -1
  }
  if (y < x) {
    return 1
  }
  return 0
}

// BUFFER INSTANCE METHODS
// =======================

function hexWrite (buf, string, offset, length) {
  offset = Number(offset) || 0
  var remaining = buf.length - offset
  if (!length) {
    length = remaining
  } else {
    length = Number(length)
    if (length > remaining) {
      length = remaining
    }
  }

  // must be an even number of digits
  var strLen = string.length
  assert(strLen % 2 === 0, 'Invalid hex string')

  if (length > strLen / 2) {
    length = strLen / 2
  }
  for (var i = 0; i < length; i++) {
    var byte = parseInt(string.substr(i * 2, 2), 16)
    assert(!isNaN(byte), 'Invalid hex string')
    buf[offset + i] = byte
  }
  return i
}

function utf8Write (buf, string, offset, length) {
  var charsWritten = blitBuffer(utf8ToBytes(string), buf, offset, length)
  return charsWritten
}

function asciiWrite (buf, string, offset, length) {
  var charsWritten = blitBuffer(asciiToBytes(string), buf, offset, length)
  return charsWritten
}

function binaryWrite (buf, string, offset, length) {
  return asciiWrite(buf, string, offset, length)
}

function base64Write (buf, string, offset, length) {
  var charsWritten = blitBuffer(base64ToBytes(string), buf, offset, length)
  return charsWritten
}

function utf16leWrite (buf, string, offset, length) {
  var charsWritten = blitBuffer(utf16leToBytes(string), buf, offset, length)
  return charsWritten
}

Buffer.prototype.write = function (string, offset, length, encoding) {
  // Support both (string, offset, length, encoding)
  // and the legacy (string, encoding, offset, length)
  if (isFinite(offset)) {
    if (!isFinite(length)) {
      encoding = length
      length = undefined
    }
  } else {  // legacy
    var swap = encoding
    encoding = offset
    offset = length
    length = swap
  }

  offset = Number(offset) || 0
  var remaining = this.length - offset
  if (!length) {
    length = remaining
  } else {
    length = Number(length)
    if (length > remaining) {
      length = remaining
    }
  }
  encoding = String(encoding || 'utf8').toLowerCase()

  var ret
  switch (encoding) {
    case 'hex':
      ret = hexWrite(this, string, offset, length)
      break
    case 'utf8':
    case 'utf-8':
      ret = utf8Write(this, string, offset, length)
      break
    case 'ascii':
      ret = asciiWrite(this, string, offset, length)
      break
    case 'binary':
      ret = binaryWrite(this, string, offset, length)
      break
    case 'base64':
      ret = base64Write(this, string, offset, length)
      break
    case 'ucs2':
    case 'ucs-2':
    case 'utf16le':
    case 'utf-16le':
      ret = utf16leWrite(this, string, offset, length)
      break
    default:
      throw new Error('Unknown encoding')
  }
  return ret
}

Buffer.prototype.toString = function (encoding, start, end) {
  var self = this

  encoding = String(encoding || 'utf8').toLowerCase()
  start = Number(start) || 0
  end = (end === undefined) ? self.length : Number(end)

  // Fastpath empty strings
  if (end === start)
    return ''

  var ret
  switch (encoding) {
    case 'hex':
      ret = hexSlice(self, start, end)
      break
    case 'utf8':
    case 'utf-8':
      ret = utf8Slice(self, start, end)
      break
    case 'ascii':
      ret = asciiSlice(self, start, end)
      break
    case 'binary':
      ret = binarySlice(self, start, end)
      break
    case 'base64':
      ret = base64Slice(self, start, end)
      break
    case 'ucs2':
    case 'ucs-2':
    case 'utf16le':
    case 'utf-16le':
      ret = utf16leSlice(self, start, end)
      break
    default:
      throw new Error('Unknown encoding')
  }
  return ret
}

Buffer.prototype.toJSON = function () {
  return {
    type: 'Buffer',
    data: Array.prototype.slice.call(this._arr || this, 0)
  }
}

Buffer.prototype.equals = function (b) {
  assert(Buffer.isBuffer(b), 'Argument must be a Buffer')
  return Buffer.compare(this, b) === 0
}

Buffer.prototype.compare = function (b) {
  assert(Buffer.isBuffer(b), 'Argument must be a Buffer')
  return Buffer.compare(this, b)
}

// copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length)
Buffer.prototype.copy = function (target, target_start, start, end) {
  var source = this

  if (!start) start = 0
  if (!end && end !== 0) end = this.length
  if (!target_start) target_start = 0

  // Copy 0 bytes; we're done
  if (end === start) return
  if (target.length === 0 || source.length === 0) return

  // Fatal error conditions
  assert(end >= start, 'sourceEnd < sourceStart')
  assert(target_start >= 0 && target_start < target.length,
      'targetStart out of bounds')
  assert(start >= 0 && start < source.length, 'sourceStart out of bounds')
  assert(end >= 0 && end <= source.length, 'sourceEnd out of bounds')

  // Are we oob?
  if (end > this.length)
    end = this.length
  if (target.length - target_start < end - start)
    end = target.length - target_start + start

  var len = end - start

  if (len < 100 || !Buffer._useTypedArrays) {
    for (var i = 0; i < len; i++) {
      target[i + target_start] = this[i + start]
    }
  } else {
    target._set(this.subarray(start, start + len), target_start)
  }
}

function base64Slice (buf, start, end) {
  if (start === 0 && end === buf.length) {
    return base64.fromByteArray(buf)
  } else {
    return base64.fromByteArray(buf.slice(start, end))
  }
}

function utf8Slice (buf, start, end) {
  var res = ''
  var tmp = ''
  end = Math.min(buf.length, end)

  for (var i = start; i < end; i++) {
    if (buf[i] <= 0x7F) {
      res += decodeUtf8Char(tmp) + String.fromCharCode(buf[i])
      tmp = ''
    } else {
      tmp += '%' + buf[i].toString(16)
    }
  }

  return res + decodeUtf8Char(tmp)
}

function asciiSlice (buf, start, end) {
  var ret = ''
  end = Math.min(buf.length, end)

  for (var i = start; i < end; i++) {
    ret += String.fromCharCode(buf[i])
  }
  return ret
}

function binarySlice (buf, start, end) {
  return asciiSlice(buf, start, end)
}

function hexSlice (buf, start, end) {
  var len = buf.length

  if (!start || start < 0) start = 0
  if (!end || end < 0 || end > len) end = len

  var out = ''
  for (var i = start; i < end; i++) {
    out += toHex(buf[i])
  }
  return out
}

function utf16leSlice (buf, start, end) {
  var bytes = buf.slice(start, end)
  var res = ''
  for (var i = 0; i < bytes.length; i += 2) {
    res += String.fromCharCode(bytes[i] + bytes[i + 1] * 256)
  }
  return res
}

Buffer.prototype.slice = function (start, end) {
  var len = this.length
  start = clamp(start, len, 0)
  end = clamp(end, len, len)

  if (Buffer._useTypedArrays) {
    return Buffer._augment(this.subarray(start, end))
  } else {
    var sliceLen = end - start
    var newBuf = new Buffer(sliceLen, undefined, true)
    for (var i = 0; i < sliceLen; i++) {
      newBuf[i] = this[i + start]
    }
    return newBuf
  }
}

// `get` will be removed in Node 0.13+
Buffer.prototype.get = function (offset) {
  console.log('.get() is deprecated. Access using array indexes instead.')
  return this.readUInt8(offset)
}

// `set` will be removed in Node 0.13+
Buffer.prototype.set = function (v, offset) {
  console.log('.set() is deprecated. Access using array indexes instead.')
  return this.writeUInt8(v, offset)
}

Buffer.prototype.readUInt8 = function (offset, noAssert) {
  if (!noAssert) {
    assert(offset !== undefined && offset !== null, 'missing offset')
    assert(offset < this.length, 'Trying to read beyond buffer length')
  }

  if (offset >= this.length)
    return

  return this[offset]
}

function readUInt16 (buf, offset, littleEndian, noAssert) {
  if (!noAssert) {
    assert(typeof littleEndian === 'boolean', 'missing or invalid endian')
    assert(offset !== undefined && offset !== null, 'missing offset')
    assert(offset + 1 < buf.length, 'Trying to read beyond buffer length')
  }

  var len = buf.length
  if (offset >= len)
    return

  var val
  if (littleEndian) {
    val = buf[offset]
    if (offset + 1 < len)
      val |= buf[offset + 1] << 8
  } else {
    val = buf[offset] << 8
    if (offset + 1 < len)
      val |= buf[offset + 1]
  }
  return val
}

Buffer.prototype.readUInt16LE = function (offset, noAssert) {
  return readUInt16(this, offset, true, noAssert)
}

Buffer.prototype.readUInt16BE = function (offset, noAssert) {
  return readUInt16(this, offset, false, noAssert)
}

function readUInt32 (buf, offset, littleEndian, noAssert) {
  if (!noAssert) {
    assert(typeof littleEndian === 'boolean', 'missing or invalid endian')
    assert(offset !== undefined && offset !== null, 'missing offset')
    assert(offset + 3 < buf.length, 'Trying to read beyond buffer length')
  }

  var len = buf.length
  if (offset >= len)
    return

  var val
  if (littleEndian) {
    if (offset + 2 < len)
      val = buf[offset + 2] << 16
    if (offset + 1 < len)
      val |= buf[offset + 1] << 8
    val |= buf[offset]
    if (offset + 3 < len)
      val = val + (buf[offset + 3] << 24 >>> 0)
  } else {
    if (offset + 1 < len)
      val = buf[offset + 1] << 16
    if (offset + 2 < len)
      val |= buf[offset + 2] << 8
    if (offset + 3 < len)
      val |= buf[offset + 3]
    val = val + (buf[offset] << 24 >>> 0)
  }
  return val
}

Buffer.prototype.readUInt32LE = function (offset, noAssert) {
  return readUInt32(this, offset, true, noAssert)
}

Buffer.prototype.readUInt32BE = function (offset, noAssert) {
  return readUInt32(this, offset, false, noAssert)
}

Buffer.prototype.readInt8 = function (offset, noAssert) {
  if (!noAssert)