ndn-js-contrib/peer.js

Reusable 'Classes' for Named Data Networking: NameTree, PIT, FIB, ContentStore, Interfaces, and Transports

(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);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.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(require,module,exports){
module.exports.RTCSessionDescription = window.RTCSessionDescription ||
	window.mozRTCSessionDescription;
module.exports.RTCPeerConnection = window.RTCPeerConnection ||
	window.mozRTCPeerConnection || window.webkitRTCPeerConnection;
module.exports.RTCIceCandidate = window.RTCIceCandidate ||
	window.mozRTCIceCandidate;

},{}],2:[function(require,module,exports){
var util = require('./util');
var EventEmitter = require('eventemitter3');
var Negotiator = require('./negotiator');
var Reliable = require('reliable');

/**
 * Wraps a DataChannel between two Peers.
 */
function DataConnection(peer, provider, options) {
  if (!(this instanceof DataConnection)) return new DataConnection(peer, provider, options);
  EventEmitter.call(this);

  this.options = util.extend({
    serialization: 'binary',
    reliable: false
  }, options);

  // Connection is not open yet.
  this.open = false;
  this.type = 'data';
  this.peer = peer;
  this.provider = provider;

  this.id = this.options.connectionId || DataConnection._idPrefix + util.randomToken();

  this.label = this.options.label || this.id;
  this.metadata = this.options.metadata;
  this.serialization = this.options.serialization;
  this.reliable = this.options.reliable;

  // Data channel buffering.
  this._buffer = [];
  this._buffering = false;
  this.bufferSize = 0;

  // For storing large data.
  this._chunkedData = {};

  if (this.options._payload) {
    this._peerBrowser = this.options._payload.browser;
  }

  Negotiator.startConnection(
    this,
    this.options._payload || {
      originator: true
    }
  );
}

util.inherits(DataConnection, EventEmitter);

DataConnection._idPrefix = 'dc_';

/** Called by the Negotiator when the DataChannel is ready. */
DataConnection.prototype.initialize = function(dc) {
  this._dc = this.dataChannel = dc;
  this._configureDataChannel();
}

DataConnection.prototype._configureDataChannel = function() {
  var self = this;
  if (util.supports.sctp) {
    this._dc.binaryType = 'arraybuffer';
  }
  this._dc.onopen = function() {
    util.log('Data channel connection success');
    self.open = true;
    self.emit('open');
  }

  // Use the Reliable shim for non Firefox browsers
  if (!util.supports.sctp && this.reliable) {
    this._reliable = new Reliable(this._dc, util.debug);
  }

  if (this._reliable) {
    this._reliable.onmessage = function(msg) {
      self.emit('data', msg);
    };
  } else {
    this._dc.onmessage = function(e) {
      self._handleDataMessage(e);
    };
  }
  this._dc.onclose = function(e) {
    util.log('DataChannel closed for:', self.peer);
    self.close();
  };
}

// Handles a DataChannel message.
DataConnection.prototype._handleDataMessage = function(e) {
  var self = this;
  var data = e.data;
  var datatype = data.constructor;
  if (this.serialization === 'binary' || this.serialization === 'binary-utf8') {
    if (datatype === Blob) {
      // Datatype should never be blob
      util.blobToArrayBuffer(data, function(ab) {
        data = util.unpack(ab);
        self.emit('data', data);
      });
      return;
    } else if (datatype === ArrayBuffer) {
      data = util.unpack(data);
    } else if (datatype === String) {
      // String fallback for binary data for browsers that don't support binary yet
      var ab = util.binaryStringToArrayBuffer(data);
      data = util.unpack(ab);
    }
  } else if (this.serialization === 'json') {
    data = JSON.parse(data);
  }

  // Check if we've chunked--if so, piece things back together.
  // We're guaranteed that this isn't 0.
  if (data.__peerData) {
    var id = data.__peerData;
    var chunkInfo = this._chunkedData[id] || {data: [], count: 0, total: data.total};

    chunkInfo.data[data.n] = data.data;
    chunkInfo.count += 1;

    if (chunkInfo.total === chunkInfo.count) {
      // Clean up before making the recursive call to `_handleDataMessage`.
      delete this._chunkedData[id];

      // We've received all the chunks--time to construct the complete data.
      data = new Blob(chunkInfo.data);
      this._handleDataMessage({data: data});
    }

    this._chunkedData[id] = chunkInfo;
    return;
  }

  this.emit('data', data);
}

/**
 * Exposed functionality for users.
 */

/** Allows user to close connection. */
DataConnection.prototype.close = function() {
  if (!this.open) {
    return;
  }
  this.open = false;
  Negotiator.cleanup(this);
  this.emit('close');
}

/** Allows user to send data. */
DataConnection.prototype.send = function(data, chunked) {
  if (!this.open) {
    this.emit('error', new Error('Connection is not open. You should listen for the `open` event before sending messages.'));
    return;
  }
  if (this._reliable) {
    // Note: reliable shim sending will make it so that you cannot customize
    // serialization.
    this._reliable.send(data);
    return;
  }
  var self = this;
  if (this.serialization === 'json') {
    this._bufferedSend(JSON.stringify(data));
  } else if (this.serialization === 'binary' || this.serialization === 'binary-utf8') {
    var blob = util.pack(data);

    // For Chrome-Firefox interoperability, we need to make Firefox "chunk"
    // the data it sends out.
    var needsChunking = util.chunkedBrowsers[this._peerBrowser] || util.chunkedBrowsers[util.browser];
    if (needsChunking && !chunked && blob.size > util.chunkedMTU) {
      this._sendChunks(blob);
      return;
    }

    // DataChannel currently only supports strings.
    if (!util.supports.sctp) {
      util.blobToBinaryString(blob, function(str) {
        self._bufferedSend(str);
      });
    } else if (!util.supports.binaryBlob) {
      // We only do this if we really need to (e.g. blobs are not supported),
      // because this conversion is costly.
      util.blobToArrayBuffer(blob, function(ab) {
        self._bufferedSend(ab);
      });
    } else {
      this._bufferedSend(blob);
    }
  } else {
    this._bufferedSend(data);
  }
}

DataConnection.prototype._bufferedSend = function(msg) {
  if (this._buffering || !this._trySend(msg)) {
    this._buffer.push(msg);
    this.bufferSize = this._buffer.length;
  }
}

// Returns true if the send succeeds.
DataConnection.prototype._trySend = function(msg) {
  try {
    this._dc.send(msg);
  } catch (e) {
    this._buffering = true;

    var self = this;
    setTimeout(function() {
      // Try again.
      self._buffering = false;
      self._tryBuffer();
    }, 100);
    return false;
  }
  return true;
}

// Try to send the first message in the buffer.
DataConnection.prototype._tryBuffer = function() {
  if (this._buffer.length === 0) {
    return;
  }

  var msg = this._buffer[0];

  if (this._trySend(msg)) {
    this._buffer.shift();
    this.bufferSize = this._buffer.length;
    this._tryBuffer();
  }
}

DataConnection.prototype._sendChunks = function(blob) {
  var blobs = util.chunk(blob);
  for (var i = 0, ii = blobs.length; i < ii; i += 1) {
    var blob = blobs[i];
    this.send(blob, true);
  }
}

DataConnection.prototype.handleMessage = function(message) {
  var payload = message.payload;

  switch (message.type) {
    case 'ANSWER':
      this._peerBrowser = payload.browser;

      // Forward to negotiator
      Negotiator.handleSDP(message.type, this, payload.sdp);
      break;
    case 'CANDIDATE':
      Negotiator.handleCandidate(this, payload.candidate);
      break;
    default:
      util.warn('Unrecognized message type:', message.type, 'from peer:', this.peer);
      break;
  }
}

module.exports = DataConnection;

},{"./negotiator":4,"./util":7,"eventemitter3":8,"reliable":11}],3:[function(require,module,exports){
var util = require('./util');
var EventEmitter = require('eventemitter3');
var Negotiator = require('./negotiator');

/**
 * Wraps the streaming interface between two Peers.
 */
function MediaConnection(peer, provider, options) {
  if (!(this instanceof MediaConnection)) return new MediaConnection(peer, provider, options);
  EventEmitter.call(this);

  this.options = util.extend({}, options);

  this.open = false;
  this.type = 'media';
  this.peer = peer;
  this.provider = provider;
  this.metadata = this.options.metadata;
  this.localStream = this.options._stream;

  this.id = this.options.connectionId || MediaConnection._idPrefix + util.randomToken();
  if (this.localStream) {
    Negotiator.startConnection(
      this,
      {_stream: this.localStream, originator: true}
    );
  }
};

util.inherits(MediaConnection, EventEmitter);

MediaConnection._idPrefix = 'mc_';

MediaConnection.prototype.addStream = function(remoteStream) {
  util.log('Receiving stream', remoteStream);

  this.remoteStream = remoteStream;
  this.emit('stream', remoteStream); // Should we call this `open`?

};

MediaConnection.prototype.handleMessage = function(message) {
  var payload = message.payload;

  switch (message.type) {
    case 'ANSWER':
      // Forward to negotiator
      Negotiator.handleSDP(message.type, this, payload.sdp);
      this.open = true;
      break;
    case 'CANDIDATE':
      Negotiator.handleCandidate(this, payload.candidate);
      break;
    default:
      util.warn('Unrecognized message type:', message.type, 'from peer:', this.peer);
      break;
  }
}

MediaConnection.prototype.answer = function(stream) {
  if (this.localStream) {
    util.warn('Local stream already exists on this MediaConnection. Are you answering a call twice?');
    return;
  }

  this.options._payload._stream = stream;

  this.localStream = stream;
  Negotiator.startConnection(
    this,
    this.options._payload
  )
  // Retrieve lost messages stored because PeerConnection not set up.
  var messages = this.provider._getMessages(this.id);
  for (var i = 0, ii = messages.length; i < ii; i += 1) {
    this.handleMessage(messages[i]);
  }
  this.open = true;
};

/**
 * Exposed functionality for users.
 */

/** Allows user to close connection. */
MediaConnection.prototype.close = function() {
  if (!this.open) {
    return;
  }
  this.open = false;
  Negotiator.cleanup(this);
  this.emit('close')
};

module.exports = MediaConnection;

},{"./negotiator":4,"./util":7,"eventemitter3":8}],4:[function(require,module,exports){
var util = require('./util');
var RTCPeerConnection = require('./adapter').RTCPeerConnection;
var RTCSessionDescription = require('./adapter').RTCSessionDescription;
var RTCIceCandidate = require('./adapter').RTCIceCandidate;

/**
 * Manages all negotiations between Peers.
 */
var Negotiator = {
  pcs: {
    data: {},
    media: {}
  }, // type => {peerId: {pc_id: pc}}.
  //providers: {}, // provider's id => providers (there may be multiple providers/client.
  queue: [] // connections that are delayed due to a PC being in use.
}

Negotiator._idPrefix = 'pc_';

/** Returns a PeerConnection object set up correctly (for data, media). */
Negotiator.startConnection = function(connection, options) {
  var pc = Negotiator._getPeerConnection(connection, options);

  if (connection.type === 'media' && options._stream) {
    // Add the stream.
    pc.addStream(options._stream);
  }

  // Set the connection's PC.
  connection.pc = connection.peerConnection = pc;
  // What do we need to do now?
  if (options.originator) {
    if (connection.type === 'data') {
      // Create the datachannel.
      var config = {};
      // Dropping reliable:false support, since it seems to be crashing
      // Chrome.
      /*if (util.supports.sctp && !options.reliable) {
        // If we have canonical reliable support...
        config = {maxRetransmits: 0};
      }*/
      // Fallback to ensure older browsers don't crash.
      if (!util.supports.sctp) {
        config = {reliable: options.reliable};
      }
      var dc = pc.createDataChannel(connection.label, config);
      connection.initialize(dc);
    }

    if (!util.supports.onnegotiationneeded) {
      Negotiator._makeOffer(connection);
    }
  } else {
    Negotiator.handleSDP('OFFER', connection, options.sdp);
  }
}

Negotiator._getPeerConnection = function(connection, options) {
  if (!Negotiator.pcs[connection.type]) {
    util.error(connection.type + ' is not a valid connection type. Maybe you overrode the `type` property somewhere.');
  }

  if (!Negotiator.pcs[connection.type][connection.peer]) {
    Negotiator.pcs[connection.type][connection.peer] = {};
  }
  var peerConnections = Negotiator.pcs[connection.type][connection.peer];

  var pc;
  // Not multiplexing while FF and Chrome have not-great support for it.
  /*if (options.multiplex) {
    ids = Object.keys(peerConnections);
    for (var i = 0, ii = ids.length; i < ii; i += 1) {
      pc = peerConnections[ids[i]];
      if (pc.signalingState === 'stable') {
        break; // We can go ahead and use this PC.
      }
    }
  } else */
  if (options.pc) { // Simplest case: PC id already provided for us.
    pc = Negotiator.pcs[connection.type][connection.peer][options.pc];
  }

  if (!pc || pc.signalingState !== 'stable') {
    pc = Negotiator._startPeerConnection(connection);
  }
  return pc;
}

/*
Negotiator._addProvider = function(provider) {
  if ((!provider.id && !provider.disconnected) || !provider.socket.open) {
    // Wait for provider to obtain an ID.
    provider.on('open', function(id) {
      Negotiator._addProvider(provider);
    });
  } else {
    Negotiator.providers[provider.id] = provider;
  }
}*/


/** Start a PC. */
Negotiator._startPeerConnection = function(connection) {
  util.log('Creating RTCPeerConnection.');

  var id = Negotiator._idPrefix + util.randomToken();
  var optional = {};

  if (connection.type === 'data' && !util.supports.sctp) {
    optional = {optional: [{RtpDataChannels: true}]};
  } else if (connection.type === 'media') {
    // Interop req for chrome.
    optional = {optional: [{DtlsSrtpKeyAgreement: true}]};
  }

  var pc = new RTCPeerConnection(connection.provider.options.config, optional);
  Negotiator.pcs[connection.type][connection.peer][id] = pc;

  Negotiator._setupListeners(connection, pc, id);

  return pc;
}

/** Set up various WebRTC listeners. */
Negotiator._setupListeners = function(connection, pc, pc_id) {
  var peerId = connection.peer;
  var connectionId = connection.id;
  var provider = connection.provider;

  // ICE CANDIDATES.
  util.log('Listening for ICE candidates.');
  pc.onicecandidate = function(evt) {
    if (evt.candidate) {
      util.log('Received ICE candidates for:', connection.peer);
      provider.socket.send({
        type: 'CANDIDATE',
        payload: {
          candidate: evt.candidate,
          type: connection.type,
          connectionId: connection.id
        },
        dst: peerId
      });
    }
  };

  pc.oniceconnectionstatechange = function() {
    switch (pc.iceConnectionState) {
      case 'disconnected':
      case 'failed':
        util.log('iceConnectionState is disconnected, closing connections to ' + peerId);
        connection.close();
        break;
      case 'completed':
        pc.onicecandidate = util.noop;
        break;
    }
  };

  // Fallback for older Chrome impls.
  pc.onicechange = pc.oniceconnectionstatechange;

  // ONNEGOTIATIONNEEDED (Chrome)
  util.log('Listening for `negotiationneeded`');
  pc.onnegotiationneeded = function() {
    util.log('`negotiationneeded` triggered');
    if (pc.signalingState == 'stable') {
      Negotiator._makeOffer(connection);
    } else {
      util.log('onnegotiationneeded triggered when not stable. Is another connection being established?');
    }
  };

  // DATACONNECTION.
  util.log('Listening for data channel');
  // Fired between offer and answer, so options should already be saved
  // in the options hash.
  pc.ondatachannel = function(evt) {
    util.log('Received data channel');
    var dc = evt.channel;
    var connection = provider.getConnection(peerId, connectionId);
    connection.initialize(dc);
  };

  // MEDIACONNECTION.
  util.log('Listening for remote stream');
  pc.onaddstream = function(evt) {
    util.log('Received remote stream');
    var stream = evt.stream;
    var connection = provider.getConnection(peerId, connectionId);
    // 10/10/2014: looks like in Chrome 38, onaddstream is triggered after
    // setting the remote description. Our connection object in these cases
    // is actually a DATA connection, so addStream fails.
    // TODO: This is hopefully just a temporary fix. We should try to
    // understand why this is happening.
    if (connection.type === 'media') {
      connection.addStream(stream);
    }
  };
}

Negotiator.cleanup = function(connection) {
  util.log('Cleaning up PeerConnection to ' + connection.peer);

  var pc = connection.pc;

  if (!!pc && (pc.readyState !== 'closed' || pc.signalingState !== 'closed')) {
    pc.close();
    connection.pc = null;
  }
}

Negotiator._makeOffer = function(connection) {
  var pc = connection.pc;
  pc.createOffer(function(offer) {
    util.log('Created offer.');

    if (!util.supports.sctp && connection.type === 'data' && connection.reliable) {
      offer.sdp = Reliable.higherBandwidthSDP(offer.sdp);
    }

    pc.setLocalDescription(offer, function() {
      util.log('Set localDescription: offer', 'for:', connection.peer);
      connection.provider.socket.send({
        type: 'OFFER',
        payload: {
          sdp: offer,
          type: connection.type,
          label: connection.label,
          connectionId: connection.id,
          reliable: connection.reliable,
          serialization: connection.serialization,
          metadata: connection.metadata,
          browser: util.browser
        },
        dst: connection.peer
      });
    }, function(err) {
      connection.provider.emitError('webrtc', err);
      util.log('Failed to setLocalDescription, ', err);
    });
  }, function(err) {
    connection.provider.emitError('webrtc', err);
    util.log('Failed to createOffer, ', err);
  }, connection.options.constraints);
}

Negotiator._makeAnswer = function(connection) {
  var pc = connection.pc;

  pc.createAnswer(function(answer) {
    util.log('Created answer.');

    if (!util.supports.sctp && connection.type === 'data' && connection.reliable) {
      answer.sdp = Reliable.higherBandwidthSDP(answer.sdp);
    }

    pc.setLocalDescription(answer, function() {
      util.log('Set localDescription: answer', 'for:', connection.peer);
      connection.provider.socket.send({
        type: 'ANSWER',
        payload: {
          sdp: answer,
          type: connection.type,
          connectionId: connection.id,
          browser: util.browser
        },
        dst: connection.peer
      });
    }, function(err) {
      connection.provider.emitError('webrtc', err);
      util.log('Failed to setLocalDescription, ', err);
    });
  }, function(err) {
    connection.provider.emitError('webrtc', err);
    util.log('Failed to create answer, ', err);
  });
}

/** Handle an SDP. */
Negotiator.handleSDP = function(type, connection, sdp) {
  sdp = new RTCSessionDescription(sdp);
  var pc = connection.pc;

  util.log('Setting remote description', sdp);
  pc.setRemoteDescription(sdp, function() {
    util.log('Set remoteDescription:', type, 'for:', connection.peer);

    if (type === 'OFFER') {
      Negotiator._makeAnswer(connection);
    }
  }, function(err) {
    connection.provider.emitError('webrtc', err);
    util.log('Failed to setRemoteDescription, ', err);
  });
}

/** Handle a candidate. */
Negotiator.handleCandidate = function(connection, ice) {
  var candidate = ice.candidate;
  var sdpMLineIndex = ice.sdpMLineIndex;
  connection.pc.addIceCandidate(new RTCIceCandidate({
    sdpMLineIndex: sdpMLineIndex,
    candidate: candidate
  }));
  util.log('Added ICE candidate for:', connection.peer);
}

module.exports = Negotiator;

},{"./adapter":1,"./util":7}],5:[function(require,module,exports){
var util = require('./util');
var EventEmitter = require('eventemitter3');
var Socket = require('./socket');
var MediaConnection = require('./mediaconnection');
var DataConnection = require('./dataconnection');

/**
 * A peer who can initiate connections with other peers.
 */
function Peer(id, options) {
  if (!(this instanceof Peer)) return new Peer(id, options);
  EventEmitter.call(this);

  // Deal with overloading
  if (id && id.constructor == Object) {
    options = id;
    id = undefined;
  } else if (id) {
    // Ensure id is a string
    id = id.toString();
  }
  //

  // Configurize options
  options = util.extend({
    debug: 0, // 1: Errors, 2: Warnings, 3: All logs
    host: util.CLOUD_HOST,
    port: util.CLOUD_PORT,
    key: 'peerjs',
    path: '/',
    token: util.randomToken(),
    config: util.defaultConfig
  }, options);
  this.options = options;
  // Detect relative URL host.
  if (options.host === '/') {
    options.host = window.location.hostname;
  }
  // Set path correctly.
  if (options.path[0] !== '/') {
    options.path = '/' + options.path;
  }
  if (options.path[options.path.length - 1] !== '/') {
    options.path += '/';
  }

  // Set whether we use SSL to same as current host
  if (options.secure === undefined && options.host !== util.CLOUD_HOST) {
    options.secure = util.isSecure();
  }
  // Set a custom log function if present
  if (options.logFunction) {
    util.setLogFunction(options.logFunction);
  }
  util.setLogLevel(options.debug);
  //

  // Sanity checks
  // Ensure WebRTC supported
  if (!util.supports.audioVideo && !util.supports.data ) {
    this._delayedAbort('browser-incompatible', 'The current browser does not support WebRTC');
    return;
  }
  // Ensure alphanumeric id
  if (!util.validateId(id)) {
    this._delayedAbort('invalid-id', 'ID "' + id + '" is invalid');
    return;
  }
  // Ensure valid key
  if (!util.validateKey(options.key)) {
    this._delayedAbort('invalid-key', 'API KEY "' + options.key + '" is invalid');
    return;
  }
  // Ensure not using unsecure cloud server on SSL page
  if (options.secure && options.host === '0.peerjs.com') {
    this._delayedAbort('ssl-unavailable',
      'The cloud server currently does not support HTTPS. Please run your own PeerServer to use HTTPS.');
    return;
  }
  //

  // States.
  this.destroyed = false; // Connections have been killed
  this.disconnected = false; // Connection to PeerServer killed but P2P connections still active
  this.open = false; // Sockets and such are not yet open.
  //

  // References
  this.connections = {}; // DataConnections for this peer.
  this._lostMessages = {}; // src => [list of messages]
  //

  // Start the server connection
  this._initializeServerConnection();
  if (id) {
    this._initialize(id);
  } else {
    this._retrieveId();
  }
  //
}

util.inherits(Peer, EventEmitter);

// Initialize the 'socket' (which is actually a mix of XHR streaming and
// websockets.)
Peer.prototype._initializeServerConnection = function() {
  var self = this;
  this.socket = new Socket(this.options.secure, this.options.host, this.options.port, this.options.path, this.options.key);
  this.socket.on('message', function(data) {
    self._handleMessage(data);
  });
  this.socket.on('error', function(error) {
    self._abort('socket-error', error);
  });
  this.socket.on('disconnected', function() {
    // If we haven't explicitly disconnected, emit error and disconnect.
    if (!self.disconnected) {
      self.emitError('network', 'Lost connection to server.');
      self.disconnect();
    }
  });
  this.socket.on('close', function() {
    // If we haven't explicitly disconnected, emit error.
    if (!self.disconnected) {
      self._abort('socket-closed', 'Underlying socket is already closed.');
    }
  });
};

/** Get a unique ID from the server via XHR. */
Peer.prototype._retrieveId = function(cb) {
  var self = this;
  var http = new XMLHttpRequest();
  var protocol = this.options.secure ? 'https://' : 'http://';
  var url = protocol + this.options.host + ':' + this.options.port +
    this.options.path + this.options.key + '/id';
  var queryString = '?ts=' + new Date().getTime() + '' + Math.random();
  url += queryString;

  // If there's no ID we need to wait for one before trying to init socket.
  http.open('get', url, true);
  http.onerror = function(e) {
    util.error('Error retrieving ID', e);
    var pathError = '';
    if (self.options.path === '/' && self.options.host !== util.CLOUD_HOST) {
      pathError = ' If you passed in a `path` to your self-hosted PeerServer, ' +
        'you\'ll also need to pass in that same path when creating a new ' +
        'Peer.';
    }
    self._abort('server-error', 'Could not get an ID from the server.' + pathError);
  };
  http.onreadystatechange = function() {
    if (http.readyState !== 4) {
      return;
    }
    if (http.status !== 200) {
      http.onerror();
      return;
    }
    self._initialize(http.responseText);
  };
  http.send(null);
};

/** Initialize a connection with the server. */
Peer.prototype._initialize = function(id) {
  this.id = id;
  this.socket.start(this.id, this.options.token);
};

/** Handles messages from the server. */
Peer.prototype._handleMessage = function(message) {
  var type = message.type;
  var payload = message.payload;
  var peer = message.src;
  var connection;

  switch (type) {
    case 'OPEN': // The connection to the server is open.
      this.emit('open', this.id);
      this.open = true;
      break;
    case 'ERROR': // Server error.
      this._abort('server-error', payload.msg);
      break;
    case 'ID-TAKEN': // The selected ID is taken.
      this._abort('unavailable-id', 'ID `' + this.id + '` is taken');
      break;
    case 'INVALID-KEY': // The given API key cannot be found.
      this._abort('invalid-key', 'API KEY "' + this.options.key + '" is invalid');
      break;

    //
    case 'LEAVE': // Another peer has closed its connection to this peer.
      util.log('Received leave message from', peer);
      this._cleanupPeer(peer);
      break;

    case 'EXPIRE': // The offer sent to a peer has expired without response.
      this.emitError('peer-unavailable', 'Could not connect to peer ' + peer);
      break;
    case 'OFFER': // we should consider switching this to CALL/CONNECT, but this is the least breaking option.
      var connectionId = payload.connectionId;
      connection = this.getConnection(peer, connectionId);

      if (connection) {
        util.warn('Offer received for existing Connection ID:', connectionId);
        //connection.handleMessage(message);
      } else {
        // Create a new connection.
        if (payload.type === 'media') {
          connection = new MediaConnection(peer, this, {
            connectionId: connectionId,
            _payload: payload,
            metadata: payload.metadata
          });
          this._addConnection(peer, connection);
          this.emit('call', connection);
        } else if (payload.type === 'data') {
          connection = new DataConnection(peer, this, {
            connectionId: connectionId,
            _payload: payload,
            metadata: payload.metadata,
            label: payload.label,
            serialization: payload.serialization,
            reliable: payload.reliable
          });
          this._addConnection(peer, connection);
          this.emit('connection', connection);
        } else {
          util.warn('Received malformed connection type:', payload.type);
          return;
        }
        // Find messages.
        var messages = this._getMessages(connectionId);
        for (var i = 0, ii = messages.length; i < ii; i += 1) {
          connection.handleMessage(messages[i]);
        }
      }
      break;
    default:
      if (!payload) {
        util.warn('You received a malformed message from ' + peer + ' of type ' + type);
        return;
      }

      var id = payload.connectionId;
      connection = this.getConnection(peer, id);

      if (connection && connection.pc) {
        // Pass it on.
        connection.handleMessage(message);
      } else if (id) {
        // Store for possible later use
        this._storeMessage(id, message);
      } else {
        util.warn('You received an unrecognized message:', message);
      }
      break;
  }
};

/** Stores messages without a set up connection, to be claimed later. */
Peer.prototype._storeMessage = function(connectionId, message) {
  if (!this._lostMessages[connectionId]) {
    this._lostMessages[connectionId] = [];
  }
  this._lostMessages[connectionId].push(message);
};

/** Retrieve messages from lost message store */
Peer.prototype._getMessages = function(connectionId) {
  var messages = this._lostMessages[connectionId];
  if (messages) {
    delete this._lostMessages[connectionId];
    return messages;
  } else {
    return [];
  }
};

/**
 * Returns a DataConnection to the specified peer. See documentation for a
 * complete list of options.
 */
Peer.prototype.connect = function(peer, options) {
  if (this.disconnected) {
    util.warn('You cannot connect to a new Peer because you called ' +
      '.disconnect() on this Peer and ended your connection with the ' +
      'server. You can create a new Peer to reconnect, or call reconnect ' +
      'on this peer if you believe its ID to still be available.');
    this.emitError('disconnected', 'Cannot connect to new Peer after disconnecting from server.');
    return;
  }
  var connection = new DataConnection(peer, this, options);
  this._addConnection(peer, connection);
  return connection;
};

/**
 * Returns a MediaConnection to the specified peer. See documentation for a
 * complete list of options.
 */
Peer.prototype.call = function(peer, stream, options) {
  if (this.disconnected) {
    util.warn('You cannot connect to a new Peer because you called ' +
      '.disconnect() on this Peer and ended your connection with the ' +
      'server. You can create a new Peer to reconnect.');
    this.emitError('disconnected', 'Cannot connect to new Peer after disconnecting from server.');
    return;
  }
  if (!stream) {
    util.error('To call a peer, you must provide a stream from your browser\'s `getUserMedia`.');
    return;
  }
  options = options || {};
  options._stream = stream;
  var call = new MediaConnection(peer, this, options);
  this._addConnection(peer, call);
  return call;
};

/** Add a data/media connection to this peer. */
Peer.prototype._addConnection = function(peer, connection) {
  if (!this.connections[peer]) {
    this.connections[peer] = [];
  }
  this.connections[peer].push(connection);
};

/** Retrieve a data/media connection for this peer. */
Peer.prototype.getConnection = function(peer, id) {
  var connections = this.connections[peer];
  if (!connections) {
    return null;
  }
  for (var i = 0, ii = connections.length; i < ii; i++) {
    if (connections[i].id === id) {
      return connections[i];
    }
  }
  return null;
};

Peer.prototype._delayedAbort = function(type, message) {
  var self = this;
  util.setZeroTimeout(function(){
    self._abort(type, message);
  });
};

/**
 * Destroys the Peer and emits an error message.
 * The Peer is not destroyed if it's in a disconnected state, in which case
 * it retains its disconnected state and its existing connections.
 */
Peer.prototype._abort = function(type, message) {
  util.error('Aborting!');
  if (!this._lastServerId) {
    this.destroy();
  } else {
    this.disconnect();
  }
  this.emitError(type, message);
};

/** Emits a typed error message. */
Peer.prototype.emitError = function(type, err) {
  util.error('Error:', err);
  if (typeof err === 'string') {
    err = new Error(err);
  }
  err.type = type;
  this.emit('error', err);
};

/**
 * Destroys the Peer: closes all active connections as well as the connection
 *  to the server.
 * Warning: The peer can no longer create or accept connections after being
 *  destroyed.
 */
Peer.prototype.destroy = function() {
  if (!this.destroyed) {
    this._cleanup();
    this.disconnect();
    this.destroyed = true;
  }
};


/** Disconnects every connection on this peer. */
Peer.prototype._cleanup = function() {
  if (this.connections) {
    var peers = Object.keys(this.connections);
    for (var i = 0, ii = peers.length; i < ii; i++) {
      this._cleanupPeer(peers[i]);
    }
  }
  this.emit('close');
};

/** Closes all connections to this peer. */
Peer.prototype._cleanupPeer = function(peer) {
  var connections = this.connections[peer];
  for (var j = 0, jj = connections.length; j < jj; j += 1) {
    connections[j].close();
  }
};

/**
 * Disconnects the Peer's connection to the PeerServer. Does not close any
 *  active connections.
 * Warning: The peer can no longer create or accept connections after being
 *  disconnected. It also cannot reconnect to the server.
 */
Peer.prototype.disconnect = function() {
  var self = this;
  util.setZeroTimeout(function(){
    if (!self.disconnected) {
      self.disconnected = true;
      self.open = false;
      if (self.socket) {
        self.socket.close();
      }
      self.emit('disconnected', self.id);
      self._lastServerId = self.id;
      self.id = null;
    }
  });
};

/** Attempts to reconnect with the same ID. */
Peer.prototype.reconnect = function() {
  if (this.disconnected && !this.destroyed) {
    util.log('Attempting reconnection to server with ID ' + this._lastServerId);
    this.disconnected = false;
    this._initializeServerConnection();
    this._initialize(this._lastServerId);
  } else if (this.destroyed) {
    throw new Error('This peer cannot reconnect to the server. It has already been destroyed.');
  } else if (!this.disconnected && !this.open) {
    // Do nothing. We're still connecting the first time.
    util.error('In a hurry? We\'re still trying to make the initial connection!');
  } else {
    throw new Error('Peer ' + this.id + ' cannot reconnect because it is not disconnected from the server!');
  }
};

/**
 * Get a list of available peer IDs. If you're running your own server, you'll
 * want to set allow_discovery: true in the PeerServer options. If you're using
 * the cloud server, email team@peerjs.com to get the functionality enabled for
 * your key.
 */
Peer.prototype.listAllPeers = function(cb) {
  cb = cb || function() {};
  var self = this;
  var http = new XMLHttpRequest();
  var protocol = this.options.secure ? 'https://' : 'http://';
  var url = protocol + this.options.host + ':' + this.options.port +
    this.options.path + this.options.key + '/peers';
  var queryString = '?ts=' + new Date().getTime() + '' + Math.random();
  url += queryString;

  // If there's no ID we need to wait for one before trying to init socket.
  http.open('get', url, true);
  http.onerror = function(e) {
    self._abort('server-error', 'Could not get peers from the server.');
    cb([]);
  };
  http.onreadystatechange = function() {
    if (http.readyState !== 4) {
      return;
    }
    if (http.status === 401) {
      var helpfulError = '';
      if (self.options.host !== util.CLOUD_HOST) {
        helpfulError = 'It looks like you\'re using the cloud server. You can email ' +
          'team@peerjs.com to enable peer listing for your API key.';
      } else {
        helpfulError = 'You need to enable `allow_discovery` on your self-hosted ' +
          'PeerServer to use this feature.';
      }
      cb([]);
      throw new Error('It doesn\'t look like you have permission to list peers IDs. ' + helpfulError);
    } else if (http.status !== 200) {
      cb([]);
    } else {
      cb(JSON.parse(http.responseText));
    }
  };
  http.send(null);
};

module.exports = Peer;

},{"./dataconnection":2,"./mediaconnection":3,"./socket":6,"./util":7,"eventemitter3":8}],6:[function(require,module,exports){
var util = require('./util');
var EventEmitter = require('eventemitter3');

/**
 * An abstraction on top of WebSockets and XHR streaming to provide fastest
 * possible connection for peers.
 */
function Socket(secure, host, port, path, key) {
  if (!(this instanceof Socket)) return new Socket(secure, host, port, path, key);

  EventEmitter.call(this);

  // Disconnected manually.
  this.disconnected = false;
  this._queue = [];

  var httpProtocol = secure ? 'https://' : 'http://';
  var wsProtocol = secure ? 'wss://' : 'ws://';
  this._httpUrl = httpProtocol + host + ':' + port + path + key;
  this._wsUrl = wsProtocol + host + ':' + port + path + 'peerjs?key=' + key;
}

util.inherits(Socket, EventEmitter);


/** Check in with ID or get one from server. */
Socket.prototype.start = function(id, token) {
  this.id = id;

  this._httpUrl += '/' + id + '/' + token;
  this._wsUrl += '&id=' + id + '&token=' + token;

  this._startXhrStream();
  this._startWebSocket();
}


/** Start up websocket communications. */
Socket.prototype._startWebSocket = function(id) {
  var self = this;

  if (this._socket) {
    return;
  }

  this._socket = new WebSocket(this._wsUrl);

  this._socket.onmessage = function(event) {
    try {
      var data = JSON.parse(event.data);
    } catch(e) {
      util.log('Invalid server message', event.data);
      return;
    }
    self.emit('message', data);
  };

  this._socket.onclose = function(event) {
    util.log('Socket closed.');
    self.disconnected = true;
    self.emit('disconnected');
  };

  // Take care of the queue of connections if necessary and make sure Peer knows
  // socket is open.
  this._socket.onopen = function() {
    if (self._timeout) {
      clearTimeout(self._timeout);
      setTimeout(function(){
        self._http.abort();
        self._http = null;
      }, 5000);
    }
    self._sendQueuedMessages();
    util.log('Socket open');
  };
}

/** Start XHR streaming. */
Socket.prototype._startXhrStream = function(n) {
  try {
    var self = this;
    this._http = new XMLHttpRequest();
    this._http._index = 1;
    this._http._streamIndex = n || 0;
    this._http.open('post', this._httpUrl + '/id?i=' + this._http._streamIndex, true);
    this._http.onerror = function() {
      // If we get an error, likely something went wrong.
      // Stop streaming.
      clearTimeout(self._timeout);
      self.emit('disconnected');
    }
    this._http.onreadystatechange = function() {
      if (this.readyState == 2 && this.old) {
        this.old.abort();
        delete this.old;
      } else if (this.readyState > 2 && this.status === 200 && this.responseText) {
        self._handleStream(this);
      }
    };
    this._http.send(null);
    this._setHTTPTimeout();
  } catch(e) {
    util.log('XMLHttpRequest not available; defaulting to WebSockets');
  }
}


/** Handles onreadystatechange response as a stream. */
Socket.prototype._handleStream = function(http) {
  // 3 and 4 are loading/done state. All others are not relevant.
  var messages = http.responseText.split('\n');

  // Check to see if anything needs to be processed on buffer.
  if (http._buffer) {
    while (http._buffer.length > 0) {
      var index = http._buffer.shift();
      var bufferedMessage = messages[index];
      try {
        bufferedMessage = JSON.parse(bufferedMessage);
      } catch(e) {
        http._buffer.shift(index);
        break;
      }
      this.emit('message', bufferedMessage);
    }
  }

  var message = messages[http._index];
  if (message) {
    http._index += 1;
    // Buffering--this message is incomplete and we'll get to it next time.
    // This checks if the httpResponse ended in a `\n`, in which case the last
    // element of messages should be the empty string.
    if (http._index === messages.length) {
      if (!http._buffer) {
        http._buffer = [];
      }
      http._buffer.push(http._index - 1);
    } else {
      try {
        message = JSON.parse(message);
      } catch(e) {
        util.log('Invalid server message', message);
        return;
      }
      this.emit('message', message);
    }
  }
}

Socket.prototype._setHTTPTimeout = function() {
  var self = this;
  this._timeout = setTimeout(function() {
    var old = self._http;
    if (!self._wsOpen()) {
      self._startXhrStream(old._streamIndex + 1);
      self._http.old = old;
    } else {
      old.abort();
    }
  }, 25000);
}

/** Is the websocket currently open? */
Socket.prototype._wsOpen = function() {
  return this._socket && this._socket.readyState == 1;
}

/** Send queued messages. */
Socket.prototype._sendQueuedMessages = function() {
  for (var i = 0, ii = this._queue.length; i < ii; i += 1) {
    this.send(this._queue[i]);
  }
}

/** Exposed send for DC & Peer. */
Socket.prototype.send = function(data) {
  if (this.disconnected) {
    return;
  }

  // If we didn't get an ID yet, we can't yet send anything so we should queue
  // up these messages.
  if (!this.id) {
    this._queue.push(data);
    return;
  }

  if (!data.type) {
    this.emit('error', 'Invalid message');
    return;
  }

  var message = JSON.stringify(data);
  if (this._wsOpen()) {
    this._socket.send(message);
  } else {
    var http = new XMLHttpRequest();
    var url = this._httpUrl + '/' + data.type.toLowerCase();
    http.open('post', url, true);
    http.setRequestHeader('Content-Type', 'application/json');
    http.send(message);
  }
}

Socket.prototype.close = function() {
  if (!this.disconnected && this._wsOpen()) {
    this._socket.close();
    this.disconnected = true;
  }
}

module.exports = Socket;

},{"./util":7,"eventemitter3":8}],7:[function(require,module,exports){
var defaultConfig = {'iceServers': [{ 'url': 'stun:stun.l.google.com:19302' }]};
var dataCount = 1;

var BinaryPack = require('js-binarypack');
var RTCPeerConnection = require('./adapter').RTCPeerConnection;

var util = {
  noop: function() {},

  CLOUD_HOST: '0.peerjs.com',
  CLOUD_PORT: 9000,

  // Browsers that need chunking:
  chunkedBrowsers: {'Chrome': 1},
  chunkedMTU: 16300, // The original 60000 bytes setting does not work when sending data from Firefox to Chrome, which is "cut off" after 16384 bytes and delivered individually.

  // Logging logic
  logLevel: 0,
  setLogLevel: function(level) {
    var debugLevel = parseInt(level, 10);
    if (!isNaN(parseInt(level, 10))) {
      util.logLevel = debugLevel;
    } else {
      // If they are using truthy/falsy values for debug
      util.logLevel = level ? 3 : 0;
    }
    util.log = util.warn = util.error = util.noop;
    if (util.logLevel > 0) {
      util.error = util._printWith('ERROR');
    }
    if (util.logLevel > 1) {
      util.warn = util._printWith('WARNING');
    }
    if (util.logLevel > 2) {
      util.log = util._print;
    }
  },
  setLogFunction: function(fn) {
    if (fn.constructor !== Function) {
      util.warn('The log function you passed in is not a function. Defaulting to regular logs.');
    } else {
      util._print = fn;
    }
  },

  _printWith: function(prefix) {
    return function() {
      var copy = Array.prototype.slice.call(arguments);
      copy.unshift(prefix);
      util._print.apply(util, copy);
    };
  },
  _print: function () {
    var err = false;
    var copy = Array.prototype.slice.call(arguments);
    copy.unshift('PeerJS: ');
    for (var i = 0, l = copy.length; i < l; i++){
      if (copy[i] instanceof Error) {
        copy[i] = '(' + copy[i].name + ') ' + copy[i].message;
        err = true;
      }
    }
    err ? console.error.apply(console, copy) : console.log.apply(console, copy);
  },
  //

  // Returns browser-agnostic default config
  defaultConfig: defaultConfig,
  //

  // Returns the current browser.
  browser: (function() {
    if (window.mozRTCPeerConnection) {
      return 'Firefox';
    } else if (window.webkitRTCPeerConnection) {
      return 'Chrome';
    } else if (window.RTCPeerConnection) {
      return 'Supported';
    } else {
      return 'Unsupported';
    }
  })(),
  //

  // Lists which features are supported
  supports: (function() {
    if (typeof RTCPeerConnection === 'undefined') {
      return {};
    }

    var data = true;
    var audioVideo = true;

    var binaryBlob = false;
    var sctp = false;
    var onnegotiationneeded = !!window.webkitRTCPeerConnection;

    var pc, dc;
    try {
      pc = new RTCPeerConnection(defaultConfig, {optional: [{RtpDataChannels: true}]});
    } catch (e) {
      data = false;
      audioVideo = false;
    }

    if (data) {
      try {
        dc = pc.createDataChannel('_PEERJSTEST');
      } catch (e) {
        data = false;
      }
    }

    if (data) {
      // Binary test
      try {
        dc.binaryType = 'blob';
        binaryBlob = true;
      } catch (e) {
      }

      // Reliable test.
      // Unfortunately Chrome is a bit unreliable about whether or not they
      // support reliable.
      var reliablePC = new RTCPeerConnection(defaultConfig, {});
      try {
        var reliableDC = reliablePC.createDataChannel('_PEERJSRELIABLETEST', {});
        sctp = reliableDC.reliable;
      } catch (e) {
      }
      reliablePC.close();
    }

    // FIXME: not really the best check...
    if (audioVideo) {
      audioVideo = !!pc.addStream;
    }

    // FIXME: this is not great because in theory it doesn't work for
    // av-only browsers (?).
    if (!onnegotiationneeded && data) {
      // sync default check.
      var negotiationPC = new RTCPeerConnection(defaultConfig, {optional: [{RtpDataChannels: true}]});
      negotiationPC.onnegotiationneeded = function() {
        onnegotiationneeded = true;
        // async check.
        if (util && util.supports) {
          util.supports.onnegotiationneeded = true;
        }
      };
      negotiationPC.createDataChannel('_PEERJSNEGOTIATIONTEST');

      setTimeout(function() {
        negotiationPC.close();
      }, 1000);
    }

    if (pc) {
      pc.close();
    }

    return {
      audioVideo: audioVideo,
      data: data,
      binaryBlob: binaryBlob,
      binary: sctp, // deprecated; sctp implies binary support.
      reliable: sctp, // deprecated; sctp implies reliable data.
      sctp: sctp,
      onnegotiationneeded: onnegotiationneeded
    };
  }()),
  //

  // Ensure alphanumeric ids
  validateId: function(id) {
    // Allow empty ids
    return !id || /^[A-Za-z0-9]+(?:[ _-][A-Za-z0-9]+)*$/.exec(id);
  },

  validateKey: function(key) {
    // Allow empty keys
    return !key || /^[A-Za-z0-9]+(?:[ _-][A-Za-z0-9]+)*$/.exec(key);
  },


  debug: false,

  inherits: function(ctor, superCtor) {
    ctor.super_ = superCtor;
    ctor.prototype = Object.create(superCtor.prototype, {
      constructor: {
        value: ctor,
        enumerable: false,
        writable: true,
        configurable: true
      }
    });
  },
  extend: function(dest, source) {
    for(var key in source) {
      if(source.hasOwnProperty(key)) {
        dest[key] = source[key];
      }
    }
    return dest;
  },
  pack: BinaryPack.pack,
  unpack: BinaryPack.unpack,

  log: function () {
    if (util.debug) {
      var err = false;
      var copy = Array.prototype.slice.call(arguments);
      copy.unshift('PeerJS: ');
      for (var i = 0, l = copy.length; i < l; i++){
        if (copy[i] instanceof Error) {
          copy[i] = '(' + copy[i].name + ') ' + copy[i].message;
          err = true;
        }
      }
      err ? console.error.apply(console, copy) : console.log.apply(console, copy);
    }
  },

  setZeroTimeout: (function(global) {
    var timeouts = [];
    var messageName = 'zero-timeout-message';

    // Like setTimeout, but only takes a function argument.	 There's
    // no time argument (always zero) and no arguments (you have to
    // use a closure).
    function setZeroTimeoutPostMessage(fn) {
      timeouts.push(fn);
      global.postMessage(messageName, '*');
    }

    function handleMessage(event) {
      if (event.source == global && event.data == messageName) {
        if (event.stopPropagation) {
          event.stopPropagation();
        }
        if (timeouts.length) {
          timeouts.shift()();
        }
      }
    }
    if (global.addEventListener) {
      global.addEventListener('message', handleMessage, true);
    } else if (global.attachEvent) {
      global.attachEvent('onmessage', handleMessage);
    }
    return setZeroTimeoutPostMessage;
  }(window)),

  // Binary stuff

  // chunks a blob.
  chunk: function(bl) {
    var chunks = [];
    var size = bl.size;
    var start = index = 0;
    var total = Math.ceil(size / util.chunkedMTU);
    while (start < size) {
      var end = Math.min(size, start + util.chunkedMTU);
      var b = bl.slice(start, end);

      var chunk = {
        __peerData: dataCount,
        n: index,
        data: b,
        total: total
      };

      chunks.push(chunk);

      start = end;
      index += 1;
    }
    dataCount += 1;
    return chunks;
  },

  blobToArrayBuffer: function(blob, cb){
    var fr = new FileReader();
    fr.onload = function(evt) {
      cb(evt.target.result);
    };
    fr.readAsArrayBuffer(blob);
  },
  blobToBinaryString: function(blob, cb){
    var fr = new FileReader();
    fr.onload = function(evt) {
      cb(evt.target.result);
    };
    fr.readAsBinaryString(blob);
  },
  binaryStringToArrayBuffer: function(binary) {
    var byteArray = new Uint8Array(binary.length);
    for (var i = 0; i < binary.length; i++) {
      byteArray[i] = binary.charCodeAt(i) & 0xff;
    }
    return byteArray.buffer;
  },
  randomToken: function () {
    return Math.random().toString(36).substr(2);
  },
  //

  isSecure: function() {
    return location.protocol === 'https:';
  }
};

module.exports = util;

},{"./adapter":1,"js-binarypack":9}],8:[function(require,module,exports){
'use strict';

/**
 * Representation of a single EventEmitter function.
 *
 * @param {Function} fn Event handler to be called.
 * @param {Mixed} context Context for functi