socketcluster.js

(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.socketCluster = f()}})(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);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){
var SCSocket = require('./lib/scsocket');
var SCSocketCreator = require('./lib/scsocketcreator');

module.exports.SCSocketCreator = SCSocketCreator;
module.exports.SCSocket = SCSocket;

module.exports.SCEmitter = require('sc-emitter').SCEmitter;

module.exports.connect = function (options) {
  return SCSocketCreator.connect(options);
};

module.exports.destroy = function (options) {
  return SCSocketCreator.destroy(options);
};

module.exports.version = '4.3.12';

},{"./lib/scsocket":4,"./lib/scsocketcreator":5,"sc-emitter":12}],2:[function(require,module,exports){
(function (global){
var AuthEngine = function () {
  this._internalStorage = {};
};

AuthEngine.prototype._isLocalStorageEnabled = function () {
  var err;
  try {
    // Some browsers will throw an error here if localStorage is disabled.
    global.localStorage;
  } catch (e) {
    err = e;
  }
  return !err;
};

AuthEngine.prototype.saveToken = function (name, token, options, callback) {
  if (this._isLocalStorageEnabled() && global.localStorage) {
    global.localStorage.setItem(name, token);
  } else {
    this._internalStorage[name] = token;
  }
  callback && callback(null, token);
};

AuthEngine.prototype.removeToken = function (name, callback) {
  var token;

  this.loadToken(name, function (err, authToken) {
    token = authToken;
  });

  if (this._isLocalStorageEnabled() && global.localStorage) {
    global.localStorage.removeItem(name);
  }
  delete this._internalStorage[name];

  callback && callback(null, token);
};

AuthEngine.prototype.loadToken = function (name, callback) {
  var token;

  if (this._isLocalStorageEnabled() && global.localStorage) {
    token = global.localStorage.getItem(name);
  } else {
    token = this._internalStorage[name] || null;
  }
  callback(null, token);
};

module.exports.AuthEngine = AuthEngine;

}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{}],3:[function(require,module,exports){
var scErrors = require('sc-errors');
var InvalidActionError = scErrors.InvalidActionError;

var Response = function (socket, id) {
  this.socket = socket;
  this.id = id;
  this.sent = false;
};

Response.prototype._respond = function (responseData) {
  if (this.sent) {
    throw new InvalidActionError('Response ' + this.id + ' has already been sent');
  } else {
    this.sent = true;
    this.socket.send(this.socket.stringify(responseData));
  }
};

Response.prototype.end = function (data) {
  if (this.id) {
    var responseData = {
      rid: this.id
    };
    if (data !== undefined) {
      responseData.data = data;
    }
    this._respond(responseData);
  }
};

Response.prototype.error = function (error, data) {
  if (this.id) {
    var err = scErrors.dehydrateError(error);

    var responseData = {
      rid: this.id,
      error: err
    };
    if (data !== undefined) {
      responseData.data = data;
    }

    this._respond(responseData);
  }
};

Response.prototype.callback = function (error, data) {
  if (error) {
    this.error(error, data);
  } else {
    this.end(data);
  }
};

module.exports.Response = Response;

},{"sc-errors":14}],4:[function(require,module,exports){
(function (global,Buffer){
var SCEmitter = require('sc-emitter').SCEmitter;
var SCChannel = require('sc-channel').SCChannel;
var Response = require('./response').Response;
var AuthEngine = require('./auth').AuthEngine;
var SCTransport = require('./sctransport').SCTransport;
var querystring = require('querystring');
var LinkedList = require('linked-list');
var base64 = require('base-64');

var scErrors = require('sc-errors');
var InvalidArgumentsError = scErrors.InvalidArgumentsError;
var InvalidMessageError = scErrors.InvalidMessageError;
var SocketProtocolError = scErrors.SocketProtocolError;
var TimeoutError = scErrors.TimeoutError;

var isBrowser = typeof window != 'undefined';


var SCSocket = function (opts) {
  var self = this;

  SCEmitter.call(this);

  this.id = null;
  this.state = this.CLOSED;
  this.authState = this.PENDING;
  this.signedAuthToken = null;
  this.authToken = null;
  this.pendingReconnect = false;
  this.pendingReconnectTimeout = null;
  this.pendingConnectCallback = false;

  this.connectTimeout = opts.connectTimeout;
  this.ackTimeout = opts.ackTimeout;
  this.channelPrefix = opts.channelPrefix || null;

  // pingTimeout will be ackTimeout at the start, but it will
  // be updated with values provided by the 'connect' event
  this.pingTimeout = this.ackTimeout;

  var maxTimeout = Math.pow(2, 31) - 1;

  var verifyDuration = function (propertyName) {
    if (self[propertyName] > maxTimeout) {
      throw new InvalidArgumentsError('The ' + propertyName +
        ' value provided exceeded the maximum amount allowed');
    }
  };

  verifyDuration('connectTimeout');
  verifyDuration('ackTimeout');
  verifyDuration('pingTimeout');

  this._localEvents = {
    'connect': 1,
    'connectAbort': 1,
    'disconnect': 1,
    'message': 1,
    'error': 1,
    'raw': 1,
    'fail': 1,
    'kickOut': 1,
    'subscribe': 1,
    'unsubscribe': 1,
    'subscribeStateChange': 1,
    'authStateChange': 1,
    'authenticate': 1,
    'deauthenticate': 1,
    'removeAuthToken': 1,
    'subscribeRequest': 1
  };

  this.connectAttempts = 0;

  this._emitBuffer = new LinkedList();
  this._channels = {};

  this.options = opts;

  this._cid = 1;

  this.options.callIdGenerator = function () {
    return self._callIdGenerator();
  };

  if (this.options.autoReconnect) {
    if (this.options.autoReconnectOptions == null) {
      this.options.autoReconnectOptions = {};
    }

    // Add properties to the this.options.autoReconnectOptions object.
    // We assign the reference to a reconnectOptions variable to avoid repetition.
    var reconnectOptions = this.options.autoReconnectOptions;
    if (reconnectOptions.initialDelay == null) {
      reconnectOptions.initialDelay = 10000;
    }
    if (reconnectOptions.randomness == null) {
      reconnectOptions.randomness = 10000;
    }
    if (reconnectOptions.multiplier == null) {
      reconnectOptions.multiplier = 1.5;
    }
    if (reconnectOptions.maxDelay == null) {
      reconnectOptions.maxDelay = 60000;
    }
  }

  if (this.options.subscriptionRetryOptions == null) {
    this.options.subscriptionRetryOptions = {};
  }

  if (this.options.authEngine) {
    this.auth = this.options.authEngine;
  } else {
    this.auth = new AuthEngine();
  }

  this.options.path = this.options.path.replace(/\/$/, '') + '/';

  this.options.query = opts.query || {};
  if (typeof this.options.query == 'string') {
    this.options.query = querystring.parse(this.options.query);
  }

  this.connect();

  this._channelEmitter = new SCEmitter();

  if (isBrowser) {
    var unloadHandler = function () {
      self.disconnect();
    };

    if (global.attachEvent) {
      global.attachEvent('onunload', unloadHandler);
    } else if (global.addEventListener) {
      global.addEventListener('beforeunload', unloadHandler, false);
    }
  }
};

SCSocket.prototype = Object.create(SCEmitter.prototype);

SCSocket.CONNECTING = SCSocket.prototype.CONNECTING = SCTransport.prototype.CONNECTING;
SCSocket.OPEN = SCSocket.prototype.OPEN = SCTransport.prototype.OPEN;
SCSocket.CLOSED = SCSocket.prototype.CLOSED = SCTransport.prototype.CLOSED;

SCSocket.AUTHENTICATED = SCSocket.prototype.AUTHENTICATED = 'authenticated';
SCSocket.UNAUTHENTICATED = SCSocket.prototype.UNAUTHENTICATED = 'unauthenticated';
SCSocket.PENDING = SCSocket.prototype.PENDING = 'pending';

SCSocket.ignoreStatuses = scErrors.socketProtocolIgnoreStatuses;
SCSocket.errorStatuses = scErrors.socketProtocolErrorStatuses;

SCSocket.prototype._privateEventHandlerMap = {
  '#publish': function (data) {
    var undecoratedChannelName = this._undecorateChannelName(data.channel);
    var isSubscribed = this.isSubscribed(undecoratedChannelName, true);

    if (isSubscribed) {
      this._channelEmitter.emit(undecoratedChannelName, data.data);
    }
  },
  '#kickOut': function (data) {
    var undecoratedChannelName = this._undecorateChannelName(data.channel);
    var channel = this._channels[undecoratedChannelName];
    if (channel) {
      SCEmitter.prototype.emit.call(this, 'kickOut', data.message, undecoratedChannelName);
      channel.emit('kickOut', data.message, undecoratedChannelName);
      this._triggerChannelUnsubscribe(channel);
    }
  },
  '#setAuthToken': function (data, response) {
    var self = this;

    if (data) {
      var triggerAuthenticate = function (err) {
        if (err) {
          // This is a non-fatal error, we don't want to close the connection
          // because of this but we do want to notify the server and throw an error
          // on the client.
          response.error(err);
          self._onSCError(err);
        } else {
          self._changeToAuthenticatedState(data.token);
          response.end();
        }
      };

      this.auth.saveToken(this.options.authTokenName, data.token, {}, triggerAuthenticate);
    } else {
      response.error(new InvalidMessageError('No token data provided by #setAuthToken event'));
    }
  },
  '#removeAuthToken': function (data, response) {
    var self = this;

    this.auth.removeToken(this.options.authTokenName, function (err, oldToken) {
      if (err) {
        // Non-fatal error - Do not close the connection
        response.error(err);
        self._onSCError(err);
      } else {
        SCEmitter.prototype.emit.call(self, 'removeAuthToken', oldToken);
        self._changeToUnauthenticatedState();
        response.end();
      }
    });
  },
  '#disconnect': function (data) {
    this.transport.close(data.code, data.data);
  }
};

SCSocket.prototype._callIdGenerator = function () {
  return this._cid++;
};

SCSocket.prototype.getState = function () {
  return this.state;
};

SCSocket.prototype.getBytesReceived = function () {
  return this.transport.getBytesReceived();
};

SCSocket.prototype.deauthenticate = function (callback) {
  var self = this;

  this.auth.removeToken(this.options.authTokenName, function (err, oldToken) {
    self.emit('#removeAuthToken');
    callback && callback(err);
    if (err) {
      // Non-fatal error - Do not close the connection
      self._onSCError(err);
    } else {
      SCEmitter.prototype.emit.call(self, 'removeAuthToken', oldToken);
      self._changeToUnauthenticatedState();
    }
  });
};

SCSocket.prototype.connect = SCSocket.prototype.open = function () {
  var self = this;

  if (this.state == this.CLOSED) {
    this.pendingReconnect = false;
    this.pendingReconnectTimeout = null;
    clearTimeout(this._reconnectTimeoutRef);

    this.state = this.CONNECTING;
    this._changeToPendingAuthState();

    if (this.transport) {
      this.transport.off();
    }

    this.transport = new SCTransport(this.auth, this.options);

    this.transport.on('open', function (status) {
      self.state = self.OPEN;
      self._onSCOpen(status);
    });

    this.transport.on('error', function (err) {
      self._onSCError(err);
    });

    this.transport.on('close', function (code, data) {
      self.state = self.CLOSED;
      self._onSCClose(code, data);
    });

    this.transport.on('openAbort', function (code, data) {
      self.state = self.CLOSED;
      self._onSCClose(code, data, true);
    });

    this.transport.on('event', function (event, data, res) {
      self._onSCEvent(event, data, res);
    });
  }
};

SCSocket.prototype.reconnect = function () {
  this.disconnect();
  this.connect();
};

SCSocket.prototype.disconnect = function (code, data) {
  code = code || 1000;

  if (this.state == this.OPEN) {
    var packet = {
      code: code,
      data: data
    };
    this.transport.emit('#disconnect', packet);
    this.transport.close(code);

  } else if (this.state == this.CONNECTING) {
    this.transport.close(code);
  } else {
    this.pendingReconnect = false;
    this.pendingReconnectTimeout = null;
    clearTimeout(this._reconnectTimeoutRef);
  }
};

SCSocket.prototype._changeToPendingAuthState = function () {
  if (this.authState != this.PENDING) {
    var oldState = this.authState;
    this.authState = this.PENDING;
    var stateChangeData = {
      oldState: oldState,
      newState: this.authState
    };
    SCEmitter.prototype.emit.call(this, 'authStateChange', stateChangeData);
  }
};

SCSocket.prototype._changeToUnauthenticatedState = function () {
  if (this.authState != this.UNAUTHENTICATED) {
    var oldState = this.authState;
    this.authState = this.UNAUTHENTICATED;
    this.signedAuthToken = null;
    this.authToken = null;

    var stateChangeData = {
      oldState: oldState,
      newState: this.authState
    };
    SCEmitter.prototype.emit.call(this, 'authStateChange', stateChangeData);
    if (oldState == this.AUTHENTICATED) {
      SCEmitter.prototype.emit.call(this, 'deauthenticate');
    }
  }
};

SCSocket.prototype._changeToAuthenticatedState = function (signedAuthToken) {
  if (this.authState != this.AUTHENTICATED) {
    var oldState = this.authState;
    this.authState = this.AUTHENTICATED;
    this.signedAuthToken = signedAuthToken;
    this.authToken = this._extractAuthTokenData(signedAuthToken);
    var stateChangeData = {
      oldState: oldState,
      newState: this.authState,
      signedAuthToken: signedAuthToken,
      authToken: this.authToken
    };
    this.processPendingSubscriptions();

    SCEmitter.prototype.emit.call(this, 'authStateChange', stateChangeData);
    SCEmitter.prototype.emit.call(this, 'authenticate', signedAuthToken);
  }
};

SCSocket.prototype.decodeBase64 = function (encodedString) {
  var decodedString;
  if (typeof Buffer == 'undefined') {
    if (global.atob) {
      decodedString = global.atob(encodedString);
    } else {
      decodedString = base64.decode(encodedString);
    }
  } else {
    var buffer = new Buffer(encodedString, 'base64');
    decodedString = buffer.toString('utf8');
  }
  return decodedString;
};

SCSocket.prototype.encodeBase64 = function (decodedString) {
  var encodedString;
  if (typeof Buffer == 'undefined') {
    if (global.btoa) {
      encodedString = global.btoa(decodedString);
    } else {
      encodedString = base64.encode(decodedString);
    }
  } else {
    var buffer = new Buffer(decodedString, 'utf8');
    encodedString = buffer.toString('base64');
  }
  return encodedString;
};

SCSocket.prototype._extractAuthTokenData = function (signedAuthToken) {
  var tokenParts = (signedAuthToken || '').split('.');
  var encodedTokenData = tokenParts[1];
  if (encodedTokenData != null) {
    var tokenData = encodedTokenData;
    try {
      tokenData = this.decodeBase64(tokenData);
      return JSON.parse(tokenData);
    } catch (e) {
      return tokenData;
    }
  }
  return null;
};

SCSocket.prototype.getAuthToken = function () {
  return this.authToken;
};

SCSocket.prototype.getSignedAuthToken = function () {
  return this.signedAuthToken;
};

// Perform client-initiated authentication by providing an encrypted token string
SCSocket.prototype.authenticate = function (signedAuthToken, callback) {
  var self = this;

  this._changeToPendingAuthState();

  this.emit('#authenticate', signedAuthToken, function (err, authStatus) {
    if (authStatus && authStatus.authError) {
      authStatus.authError = scErrors.hydrateError(authStatus.authError);
    }
    if (err) {
      self._changeToUnauthenticatedState();
      callback && callback(err, authStatus);
    } else {
      self.auth.saveToken(self.options.authTokenName, signedAuthToken, {}, function (err) {
        callback && callback(err, authStatus);
        if (err) {
          self._changeToUnauthenticatedState();
          self._onSCError(err);
        } else {
          if (authStatus.isAuthenticated) {
            self._changeToAuthenticatedState(signedAuthToken);
          } else {
            self._changeToUnauthenticatedState();
          }
        }
      });
    }
  });
};

SCSocket.prototype._tryReconnect = function (initialDelay) {
  var self = this;

  var exponent = this.connectAttempts++;
  var reconnectOptions = this.options.autoReconnectOptions;
  var timeout;

  if (initialDelay == null || exponent > 0) {
    var initialTimeout = Math.round(reconnectOptions.initialDelay + (reconnectOptions.randomness || 0) * Math.random());

    timeout = Math.round(initialTimeout * Math.pow(reconnectOptions.multiplier, exponent));
  } else {
    timeout = initialDelay;
  }

  if (timeout > reconnectOptions.maxDelay) {
    timeout = reconnectOptions.maxDelay;
  }

  clearTimeout(this._reconnectTimeoutRef);

  this.pendingReconnect = true;
  this.pendingReconnectTimeout = timeout;
  this._reconnectTimeoutRef = setTimeout(function () {
    self.connect();
  }, timeout);
};

SCSocket.prototype._onSCOpen = function (status) {
  var self = this;

  if (status) {
    this.id = status.id;
    this.pingTimeout = status.pingTimeout;
    this.transport.pingTimeout = this.pingTimeout;
    if (status.isAuthenticated) {
      this._changeToAuthenticatedState(status.authToken);
    } else {
      this._changeToUnauthenticatedState();
    }
  } else {
    this._changeToUnauthenticatedState();
  }

  this.connectAttempts = 0;
  if (this.options.autoProcessSubscriptions) {
    this.processPendingSubscriptions();
  } else {
    this.pendingConnectCallback = true;
  }

  // If the user invokes the callback while in autoProcessSubscriptions mode, it
  // won't break anything - The processPendingSubscriptions() call will be a no-op.
  SCEmitter.prototype.emit.call(this, 'connect', status, function () {
    self.processPendingSubscriptions();
  });

  this._flushEmitBuffer();
};

SCSocket.prototype._onSCError = function (err) {
  var self = this;

  // Throw error in different stack frame so that error handling
  // cannot interfere with a reconnect action.
  setTimeout(function () {
    if (self.listeners('error').length < 1) {
      throw err;
    } else {
      SCEmitter.prototype.emit.call(self, 'error', err);
    }
  }, 0);
};

SCSocket.prototype._suspendSubscriptions = function () {
  var channel, newState;
  for (var channelName in this._channels) {
    if (this._channels.hasOwnProperty(channelName)) {
      channel = this._channels[channelName];
      if (channel.state == channel.SUBSCRIBED ||
        channel.state == channel.PENDING) {

        newState = channel.PENDING;
      } else {
        newState = channel.UNSUBSCRIBED;
      }

      this._triggerChannelUnsubscribe(channel, newState);
    }
  }
};

SCSocket.prototype._onSCClose = function (code, data, openAbort) {
  var self = this;

  this.id = null;

  if (this.transport) {
    this.transport.off();
  }
  this.pendingReconnect = false;
  this.pendingReconnectTimeout = null;
  clearTimeout(this._reconnectTimeoutRef);

  this._changeToPendingAuthState();
  this._suspendSubscriptions();

  // Try to reconnect
  // on server ping timeout (4000)
  // or on client pong timeout (4001)
  // or on close without status (1005)
  // or on handshake failure (4003)
  // or on socket hung up (1006)
  if (this.options.autoReconnect) {
    if (code == 4000 || code == 4001 || code == 1005) {
      // If there is a ping or pong timeout or socket closes without
      // status, don't wait before trying to reconnect - These could happen
      // if the client wakes up after a period of inactivity and in this case we
      // want to re-establish the connection as soon as possible.
      this._tryReconnect(0);

    } else if (code != 1000) {
      this._tryReconnect();
    }
  }

  if (openAbort) {
    SCEmitter.prototype.emit.call(self, 'connectAbort', code, data);
  } else {
    SCEmitter.prototype.emit.call(self, 'disconnect', code, data);
  }

  if (!SCSocket.ignoreStatuses[code]) {
    var err = new SocketProtocolError(SCSocket.errorStatuses[code] || 'Socket connection failed for unknown reasons', code);
    this._onSCError(err);
  }
};

SCSocket.prototype._onSCEvent = function (event, data, res) {
  var handler = this._privateEventHandlerMap[event];
  if (handler) {
    handler.call(this, data, res);
  } else {
    SCEmitter.prototype.emit.call(this, event, data, function () {
      res && res.callback.apply(res, arguments);
    });
  }
};

SCSocket.prototype.parse = function (message) {
  return this.transport.parse(message);
};

SCSocket.prototype.stringify = function (object) {
  return this.transport.stringify(object);
};

SCSocket.prototype._flushEmitBuffer = function () {
  var currentNode = this._emitBuffer.head;
  var nextNode;

  while (currentNode) {
    nextNode = currentNode.next;
    var eventObject = currentNode.data;
    currentNode.detach();
    this.transport.emitRaw(eventObject);
    currentNode = nextNode;
  }
};

SCSocket.prototype._handleEventAckTimeout = function (eventObject, eventNode) {
  if (eventNode) {
    eventNode.detach();
  }
  var error = new TimeoutError("Event response for '" + eventObject.event + "' timed out");
  var callback = eventObject.callback;
  if (callback) {
    delete eventObject.callback;
    callback.call(eventObject, error, eventObject);
  }
};

SCSocket.prototype._emit = function (event, data, callback) {
  var self = this;

  if (this.state == this.CLOSED) {
    this.connect();
  }
  var eventObject = {
    event: event,
    data: data,
    callback: callback
  };

  var eventNode = new LinkedList.Item();
  eventNode.data = eventObject;

  eventObject.timeout = setTimeout(function () {
    self._handleEventAckTimeout(eventObject, eventNode);
  }, this.ackTimeout);

  this._emitBuffer.append(eventNode);

  if (this.state == this.OPEN) {
    this._flushEmitBuffer();
  }
};

SCSocket.prototype.send = function (data) {
  this.transport.send(data);
};

SCSocket.prototype.emit = function (event, data, callback) {
  if (this._localEvents[event] == null) {
    this._emit(event, data, callback);
  } else {
    SCEmitter.prototype.emit.call(this, event, data);
  }
};

SCSocket.prototype.publish = function (channelName, data, callback) {
  var pubData = {
    channel: this._decorateChannelName(channelName),
    data: data
  };
  this.emit('#publish', pubData, callback);
};

SCSocket.prototype._triggerChannelSubscribe = function (channel) {
  var channelName = channel.name;

  if (channel.state != channel.SUBSCRIBED) {
    var oldState = channel.state;
    channel.state = channel.SUBSCRIBED;

    var stateChangeData = {
      channel: channelName,
      oldState: oldState,
      newState: channel.state
    };
    channel.emit('subscribeStateChange', stateChangeData);
    channel.emit('subscribe', channelName);
    SCEmitter.prototype.emit.call(this, 'subscribeStateChange', stateChangeData);
    SCEmitter.prototype.emit.call(this, 'subscribe', channelName);
  }
};

SCSocket.prototype._triggerChannelSubscribeFail = function (err, channel) {
  var channelName = channel.name;
  var meetsAuthRequirements = !channel.waitForAuth || this.authState == this.AUTHENTICATED;

  if (channel.state != channel.UNSUBSCRIBED && meetsAuthRequirements) {
    channel.state = channel.UNSUBSCRIBED;

    channel.emit('subscribeFail', err, channelName);
    SCEmitter.prototype.emit.call(this, 'subscribeFail', err, channelName);
  }
};

// Cancel any pending subscribe callback
SCSocket.prototype._cancelPendingSubscribeCallback = function (channel) {
  if (channel._pendingSubscriptionCid != null) {
    this.transport.cancelPendingResponse(channel._pendingSubscriptionCid);
    delete channel._pendingSubscriptionCid;
  }
};

SCSocket.prototype._decorateChannelName = function (channelName) {
  if (this.channelPrefix) {
    channelName = this.channelPrefix + channelName;
  }
  return channelName;
};

SCSocket.prototype._undecorateChannelName = function (decoratedChannelName) {
  if (this.channelPrefix && decoratedChannelName.indexOf(this.channelPrefix) == 0) {
    return decoratedChannelName.replace(this.channelPrefix, '');
  }
  return decoratedChannelName;
};

SCSocket.prototype._trySubscribe = function (channel) {
  var self = this;

  var meetsAuthRequirements = !channel.waitForAuth || this.authState == this.AUTHENTICATED;

  // We can only ever have one pending subscribe action at any given time on a channel
  if (this.state == this.OPEN && !this.pendingConnectCallback &&
    channel._pendingSubscriptionCid == null && meetsAuthRequirements) {

    var options = {
      noTimeout: true
    };

    var subscriptionData = {
      channel: this._decorateChannelName(channel.name)
    };
    if (channel.waitForAuth) {
      options.waitForAuth = true;
      subscriptionData.waitForAuth = options.waitForAuth;
    }

    channel._pendingSubscriptionCid = this.transport.emit(
      '#subscribe', subscriptionData, options,
      function (err) {
        delete channel._pendingSubscriptionCid;
        if (err) {
          self._triggerChannelSubscribeFail(err, channel);
        } else {
          self._triggerChannelSubscribe(channel);
        }
      }
    );
    SCEmitter.prototype.emit.call(this, 'subscribeRequest', channel.name);
  }
};

SCSocket.prototype.subscribe = function (channelName, options) {
  var channel = this._channels[channelName];

  if (!channel) {
    channel = new SCChannel(channelName, this, options);
    this._channels[channelName] = channel;
  }

  if (channel.state == channel.UNSUBSCRIBED) {
    channel.state = channel.PENDING;
    this._trySubscribe(channel);
  }

  return channel;
};

SCSocket.prototype._triggerChannelUnsubscribe = function (channel, newState) {
  var channelName = channel.name;
  var oldState = channel.state;

  if (newState) {
    channel.state = newState;
  } else {
    channel.state = channel.UNSUBSCRIBED;
  }
  this._cancelPendingSubscribeCallback(channel);

  if (oldState == channel.SUBSCRIBED) {
    var stateChangeData = {
      channel: channelName,
      oldState: oldState,
      newState: channel.state
    };
    channel.emit('subscribeStateChange', stateChangeData);
    channel.emit('unsubscribe', channelName);
    SCEmitter.prototype.emit.call(this, 'subscribeStateChange', stateChangeData);
    SCEmitter.prototype.emit.call(this, 'unsubscribe', channelName);
  }
};

SCSocket.prototype._tryUnsubscribe = function (channel) {
  var self = this;

  if (this.state == this.OPEN) {
    var options = {
      noTimeout: true
    };
    // If there is a pending subscribe action, cancel the callback
    this._cancelPendingSubscribeCallback(channel);

    // This operation cannot fail because the TCP protocol guarantees delivery
    // so long as the connection remains open. If the connection closes,
    // the server will automatically unsubscribe the socket and thus complete
    // the operation on the server side.
    var decoratedChannelName = this._decorateChannelName(channel.name);
    this.transport.emit('#unsubscribe', decoratedChannelName, options);
  }
};

SCSocket.prototype.unsubscribe = function (channelName) {

  var channel = this._channels[channelName];

  if (channel) {
    if (channel.state != channel.UNSUBSCRIBED) {

      this._triggerChannelUnsubscribe(channel);
      this._tryUnsubscribe(channel);
    }
  }
};

SCSocket.prototype.channel = function (channelName, options) {
  var currentChannel = this._channels[channelName];

  if (!currentChannel) {
    currentChannel = new SCChannel(channelName, this, options);
    this._channels[channelName] = currentChannel;
  }
  return currentChannel;
};

SCSocket.prototype.destroyChannel = function (channelName) {
  var channel = this._channels[channelName];
  channel.unwatch();
  channel.unsubscribe();
  delete this._channels[channelName];
};

SCSocket.prototype.subscriptions = function (includePending) {
  var subs = [];
  var channel, includeChannel;
  for (var channelName in this._channels) {
    if (this._channels.hasOwnProperty(channelName)) {
      channel = this._channels[channelName];

      if (includePending) {
        includeChannel = channel && (channel.state == channel.SUBSCRIBED ||
          channel.state == channel.PENDING);
      } else {
        includeChannel = channel && channel.state == channel.SUBSCRIBED;
      }

      if (includeChannel) {
        subs.push(channelName);
      }
    }
  }
  return subs;
};

SCSocket.prototype.isSubscribed = function (channelName, includePending) {
  var channel = this._channels[channelName];
  if (includePending) {
    return !!channel && (channel.state == channel.SUBSCRIBED ||
      channel.state == channel.PENDING);
  }
  return !!channel && channel.state == channel.SUBSCRIBED;
};

SCSocket.prototype.processPendingSubscriptions = function () {
  var self = this;

  this.pendingConnectCallback = false;

  for (var i in this._channels) {
    if (this._channels.hasOwnProperty(i)) {
      (function (channel) {
        if (channel.state == channel.PENDING) {
          self._trySubscribe(channel);
        }
      })(this._channels[i]);
    }
  }
};

SCSocket.prototype.watch = function (channelName, handler) {
  if (typeof handler != 'function') {
    throw new InvalidArgumentsError('No handler function was provided');
  }
  this._channelEmitter.on(channelName, handler);
};

SCSocket.prototype.unwatch = function (channelName, handler) {
  if (handler) {
    this._channelEmitter.removeListener(channelName, handler);
  } else {
    this._channelEmitter.removeAllListeners(channelName);
  }
};

SCSocket.prototype.watchers = function (channelName) {
  return this._channelEmitter.listeners(channelName);
};

module.exports = SCSocket;

}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {},require("buffer").Buffer)
},{"./auth":2,"./response":3,"./sctransport":6,"base-64":7,"buffer":19,"linked-list":10,"querystring":24,"sc-channel":11,"sc-emitter":12,"sc-errors":14}],5:[function(require,module,exports){
(function (global){
var SCSocket = require('./scsocket');

var _connections = {};

function getMultiplexId(options) {
  var protocolPrefix = options.secure ? 'https://' : 'http://';
  var queryString = '';
  if (options.query) {
    if (typeof options.query == 'string') {
      queryString = options.query;
    } else {
      var queryArray = [];
      var queryMap = options.query;
      for (var key in queryMap) {
        if (queryMap.hasOwnProperty(key)) {
          queryArray.push(key + '=' + queryMap[key]);
        }
      }
      if (queryArray.length) {
        queryString = '?' + queryArray.join('&');
      }
    }
  }
  return protocolPrefix + options.hostname + ':' + options.port + options.path + queryString;
}

function isUrlSecure() {
  return global.location && location.protocol == 'https:';
}

function getPort(options, isSecureDefault) {
  var isSecure = options.secure == null ? isSecureDefault : options.secure;
  return options.port || (global.location && location.port ? location.port : isSecure ? 443 : 80);
}

function connect(options) {
  var self = this;

  options = options || {};
  var isSecureDefault = isUrlSecure();

  var opts = {
    port: getPort(options, isSecureDefault),
    hostname: global.location && location.hostname,
    path: '/socketcluster/',
    secure: isSecureDefault,
    autoReconnect: true,
    autoProcessSubscriptions: true,
    connectTimeout: 20000,
    ackTimeout: 10000,
    timestampRequests: false,
    timestampParam: 't',
    authEngine: null,
    authTokenName: 'socketCluster.authToken',
    binaryType: 'arraybuffer',
    multiplex: true
  };
  for (var i in options) {
    if (options.hasOwnProperty(i)) {
      opts[i] = options[i];
    }
  }
  var multiplexId = getMultiplexId(opts);
  if (opts.multiplex === false) {
    return new SCSocket(opts);
  }
  if (_connections[multiplexId]) {
    _connections[multiplexId].connect();
  } else {
    _connections[multiplexId] = new SCSocket(opts);
  }
  return _connections[multiplexId];
}

function destroy(options) {
  var self = this;

  options = options || {};
  var isSecureDefault = isUrlSecure();

  var opts = {
    port: getPort(options, isSecureDefault),
    hostname: global.location && location.hostname,
    path: '/socketcluster/',
    secure: isSecureDefault
  };
  for (var i in options) {
    if (options.hasOwnProperty(i)) {
      opts[i] = options[i];
    }
  }
  var multiplexId = getMultiplexId(opts);
  delete _connections[multiplexId];
}

module.exports = {
  connect: connect,
  destroy: destroy
};

}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"./scsocket":4}],6:[function(require,module,exports){
var SCEmitter = require('sc-emitter').SCEmitter;
var formatter = require('sc-formatter');
var Response = require('./response').Response;
var querystring = require('querystring');
var WebSocket = require('sc-ws');

var scErrors = require('sc-errors');
var TimeoutError = scErrors.TimeoutError;


var SCTransport = function (authEngine, options) {
  this.state = this.CLOSED;
  this.auth = authEngine;
  this.options = options;
  this.connectTimeout = options.connectTimeout;
  this.pingTimeout = options.ackTimeout;
  this.callIdGenerator = options.callIdGenerator;

  this._pingTimeoutTicker = null;
  this._callbackMap = {};

  this.open();
};

SCTransport.prototype = Object.create(SCEmitter.prototype);

SCTransport.CONNECTING = SCTransport.prototype.CONNECTING = 'connecting';
SCTransport.OPEN = SCTransport.prototype.OPEN = 'open';
SCTransport.CLOSED = SCTransport.prototype.CLOSED = 'closed';

SCTransport.prototype.uri = function () {
  var query = this.options.query || {};
  var schema = this.options.secure ? 'wss' : 'ws';
  var port = '';

  if (this.options.port && (('wss' == schema && this.options.port != 443)
    || ('ws' == schema && this.options.port != 80))) {
    port = ':' + this.options.port;
  }

  if (this.options.timestampRequests) {
    query[this.options.timestampParam] = (new Date()).getTime();
  }

  query = querystring.stringify(query);

  if (query.length) {
    query = '?' + query;
  }

  return schema + '://' + this.options.hostname + port + this.options.path + query;
};

SCTransport.prototype.open = function () {
  var self = this;

  this.state = this.CONNECTING;
  var uri = this.uri();

  var wsSocket = new WebSocket(uri, null, this.options);
  wsSocket.binaryType = this.options.binaryType;
  this.socket = wsSocket;

  wsSocket.onopen = function () {
    self._onOpen();
  };

  wsSocket.onclose = function (event) {
    self._onClose(event.code, event.reason);
  };

  wsSocket.onmessage = function (message, flags) {
    self._onMessage(message.data);
  };

  wsSocket.onerror = function (error) {
    // The onclose event will be called automatically after the onerror event
    // if the socket is connected - Otherwise, if it's in the middle of
    // connecting, we want to close it manually with a 1006 - This is necessary
    // to prevent inconsistent behavior when running the client in Node.js
    // vs in a browser.

    if (self.state === self.CONNECTING) {
      self._onClose(1006);
    }
  };

  this._connectTimeoutRef = setTimeout(function () {
    self._onClose(4007);
    self.socket.close(4007);
  }, this.connectTimeout);
};

SCTransport.prototype._onOpen = function () {
  var self = this;

  clearTimeout(this._connectTimeoutRef);
  this._resetPingTimeout();

  this._handshake(function (err, status) {
    if (err) {
      self._onError(err);
      self._onClose(4003);
      self.socket.close(4003);
    } else {
      self.state = self.OPEN;
      SCEmitter.prototype.emit.call(self, 'open', status);
      self._resetPingTimeout();
    }
  });
};

SCTransport.prototype._handshake = function (callback) {
  var self = this;
  this.auth.loadToken(this.options.authTokenName, function (err, token) {
    if (err) {
      callback(err);
    } else {
      // Don't wait for this.state to be 'open'.
      // The underlying WebSocket (this.socket) is already open.
      var options = {
        force: true
      };
      self.emit('#handshake', {
        authToken: token
      }, options, function (err, status) {
        if (status) {
          // Add the token which was used as part of authentication attempt
          // to the status object.
          status.authToken = token;
          if (status.authError) {
            status.authError = scErrors.hydrateError(status.authError);
          }
        }
        callback(err, status);
      });
    }
  });
};

SCTransport.prototype._onClose = function (code, data) {
  delete this.socket.onopen;
  delete this.socket.onclose;
  delete this.socket.onmessage;
  delete this.socket.onerror;

  clearTimeout(this._connectTimeoutRef);

  if (this.state == this.OPEN) {
    this.state = this.CLOSED;
    SCEmitter.prototype.emit.call(this, 'close', code, data);

  } else if (this.state == this.CONNECTING) {
    this.state = this.CLOSED;
    SCEmitter.prototype.emit.call(this, 'openAbort', code, data);
  }
};

SCTransport.prototype._onMessage = function (message) {
  SCEmitter.prototype.emit.call(this, 'event', 'message', message);

  // If ping
  if (message == '#1') {
    this._resetPingTimeout();
    if (this.socket.readyState == this.socket.OPEN) {
      this.socket.send('#2');
    }
  } else {
    var obj;
    try {
      obj = this.parse(message);
    } catch (err) {
      obj = message;
    }
    var event = obj.event;

    if (event) {
      var response = new Response(this, obj.cid);
      SCEmitter.prototype.emit.call(this, 'event', event, obj.data, response);
    } else if (obj.rid != null) {

      var eventObject = this._callbackMap[obj.rid];
      if (eventObject) {
        clearTimeout(eventObject.timeout);
        delete this._callbackMap[obj.rid];

        if (eventObject.callback) {
          var rehydratedError = scErrors.hydrateError(obj.error);
          eventObject.callback(rehydratedError, obj.data);
        }
      }
    } else {
      SCEmitter.prototype.emit.call(this, 'event', 'raw', obj);
    }
  }
};

SCTransport.prototype._onError = function (err) {
  SCEmitter.prototype.emit.call(this, 'error', err);
};

SCTransport.prototype._resetPingTimeout = function () {
  var self = this;

  var now = (new Date()).getTime();
  clearTimeout(this._pingTimeoutTicker);

  this._pingTimeoutTicker = setTimeout(function () {
    self._onClose(4000);
    self.socket.close(4000);
  }, this.pingTimeout);
};

SCTransport.prototype.getBytesReceived = function () {
  return this.socket.bytesReceived;
};

SCTransport.prototype.close = function (code, data) {
  code = code || 1000;

  if (this.state == this.OPEN) {
    var packet = {
      code: code,
      data: data
    };
    this.emit('#disconnect', packet);

    this._onClose(code, data);
    this.socket.close(code);

  } else if (this.state == this.CONNECTING) {
    this._onClose(code, data);
    this.socket.close(code);
  }
};

SCTransport.prototype.emitRaw = function (eventObject) {
  eventObject.cid = this.callIdGenerator();

  if (eventObject.callback) {
    this._callbackMap[eventObject.cid] = eventObject;
  }

  var simpleEventObject = {
    event: eventObject.event,
    data: eventObject.data,
    cid: eventObject.cid
  };

  this.sendObject(simpleEventObject);
  return eventObject.cid;
};


SCTransport.prototype._handleEventAckTimeout = function (eventObject) {
  var errorMessage = "Event response for '" + eventObject.event + "' timed out";
  var error = new TimeoutError(errorMessage);

  if (eventObject.cid) {
    delete this._callbackMap[eventObject.cid];
  }
  var callback = eventObject.callback;
  delete eventObject.callback;
  callback.call(eventObject, error, eventObject);
};

// The last two optional arguments (a and b) can be options and/or callback
SCTransport.prototype.emit = function (event, data, a, b) {
  var self = this;

  var callback, options;

  if (b) {
    options = a;
    callback = b;
  } else {
    if (a instanceof Function) {
      options = {};
      callback = a;
    } else {
      options = a;
    }
  }

  var eventObject = {
    event: event,
    data: data,
    callback: callback
  };

  if (callback && !options.noTimeout) {
    eventObject.timeout = setTimeout(function () {
      self._handleEventAckTimeout(eventObject);
    }, this.options.ackTimeout);
  }

  var cid = null;
  if (this.state == this.OPEN || options.force) {
    cid = this.emitRaw(eventObject);
  }
  return cid;
};

SCTransport.prototype.cancelPendingResponse = function (cid) {
  delete this._callbackMap[cid];
};

SCTransport.prototype.parse = function (message) {
  return formatter.parse(message);
};

SCTransport.prototype.stringify = function (object) {
  return formatter.stringify(object);
};

SCTransport.prototype.send = function (data) {
  if (this.socket.readyState != this.socket.OPEN) {
    this._onClose(1005);
  } else {
    this.socket.send(data);
  }
};

SCTransport.prototype.sendObject = function (object) {
  var str, formatError;
  try {
    str = this.stringify(object);
  } catch (err) {
    formatError = err;
    this._onError(formatError);
  }
  if (!formatError) {
    this.send(str);
  }
};

module.exports.SCTransport = SCTransport;

},{"./response":3,"querystring":24,"sc-emitter":12,"sc-errors":14,"sc-formatter":16,"sc-ws":17}],7:[function(require,module,exports){
(function (global){
/*! http://mths.be/base64 v0.1.0 by @mathias | MIT license */
;(function(root) {

	// Detect free variables `exports`.
	var freeExports = typeof exports == 'object' && exports;

	// Detect free variable `module`.
	var freeModule = typeof module == 'object' && module &&
		module.exports == freeExports && module;

	// Detect free variable `global`, from Node.js or Browserified code, and use
	// it as `root`.
	var freeGlobal = typeof global == 'object' && global;
	if (freeGlobal.global === freeGlobal || freeGlobal.window === freeGlobal) {
		root = freeGlobal;
	}

	/*--------------------------------------------------------------------------*/

	var InvalidCharacterError = function(message) {
		this.message = message;
	};
	InvalidCharacterError.prototype = new Error;
	InvalidCharacterError.prototype.name = 'InvalidCharacterError';

	var error = function(message) {
		// Note: the error messages used throughout this file match those used by
		// the native `atob`/`btoa` implementation in Chromium.
		throw new InvalidCharacterError(message);
	};

	var TABLE = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
	// http://whatwg.org/html/common-microsyntaxes.html#space-character
	var REGEX_SPACE_CHARACTERS = /[\t\n\f\r ]/g;

	// `decode` is designed to be fully compatible with `atob` as described in the
	// HTML Standard. http://whatwg.org/html/webappapis.html#dom-windowbase64-atob
	// The optimized base64-decoding algorithm used is based on @atk’s excellent
	// implementation. https://gist.github.com/atk/1020396
	var decode = function(input) {
		input = String(input)
			.replace(REGEX_SPACE_CHARACTERS, '');
		var length = input.length;
		if (length % 4 == 0) {
			input = input.replace(/==?$/, '');
			length = input.length;
		}
		if (
			length % 4 == 1 ||
			// http://whatwg.org/C#alphanumeric-ascii-characters
			/[^+a-zA-Z0-9/]/.test(input)
		) {
			error(
				'Invalid character: the string to be decoded is not correctly encoded.'
			);
		}
		var bitCounter = 0;
		var bitStorage;
		var buffer;
		var output = '';
		var position = -1;
		while (++position < length) {
			buffer = TABLE.indexOf(input.charAt(position));
			bitStorage = bitCounter % 4 ? bitStorage * 64 + buffer : buffer;
			// Unless this is the first of a group of 4 characters…
			if (bitCounter++ % 4) {
				// …convert the first 8 bits to a single ASCII character.
				output += String.fromCharCode(
					0xFF & bitStorage >> (-2 * bitCounter & 6)
				);
			}
		}
		return output;
	};

	// `encode` is designed to be fully compatible with `btoa` as described in the
	// HTML Standard: http://whatwg.org/html/webappapis.html#dom-windowbase64-btoa
	var encode = function(input) {
		input = String(input);
		if (/[^\0-\xFF]/.test(input)) {
			// Note: no need to special-case astral symbols here, as surrogates are
			// matched, and the input is supposed to only contain ASCII anyway.
			error(
				'The string to be encoded contains characters outside of the ' +
				'Latin1 range.'
			);
		}
		var padding = input.length % 3;
		var output = '';
		var position = -1;
		var a;
		var b;
		var c;
		var d;
		var buffer;
		// Make sure any padding is handled outside of the loop.
		var length = input.length - padding;

		while (++position < length) {
			// Read three bytes, i.e. 24 bits.
			a = input.charCodeAt(position) << 16;
			b = input.charCodeAt(++position) << 8;
			c = input.charCodeAt(++position);
			buffer = a + b + c;
			// Turn the 24 bits into four chunks of 6 bits each, and append the
			// matching character for each of them to the output.
			output += (
				TABLE.charAt(buffer >> 18 & 0x3F) +
				TABLE.charAt(buffer >> 12 & 0x3F) +
				TABLE.charAt(buffer >> 6 & 0x3F) +
				TABLE.charAt(buffer & 0x3F)
			);
		}

		if (padding == 2) {
			a = input.charCodeAt(position) << 8;
			b = input.charCodeAt(++position);
			buffer = a + b;
			output += (
				TABLE.charAt(buffer >> 10) +
				TABLE.charAt((buffer >> 4) & 0x3F) +
				TABLE.charAt((buffer << 2) & 0x3F) +
				'='
			);
		} else if (padding == 1) {
			buffer = input.charCodeAt(position);
			output += (
				TABLE.charAt(buffer >> 2) +
				TABLE.charAt((buffer << 4) & 0x3F) +
				'=='
			);
		}

		return output;
	};

	var base64 = {
		'encode': encode,
		'decode': decode,
		'version': '0.1.0'
	};

	// Some AMD build optimizers, like r.js, check for specific condition patterns
	// like the following:
	if (
		typeof define == 'function' &&
		typeof define.amd == 'object' &&
		define.amd
	) {
		define(function() {
			return base64;
		});
	}	else if (freeExports && !freeExports.nodeType) {
		if (freeModule) { // in Node.js or RingoJS v0.8.0+
			freeModule.exports = base64;
		} else { // in Narwhal or RingoJS v0.7.0-
			for (var key in base64) {
				base64.hasOwnProperty(key) && (freeExports[key] = base64[key]);
			}
		}
	} else { // in Rhino or a web browser
		root.base64 = base64;
	}

}(this));

}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{}],8:[function(require,module,exports){

/**
 * Expose `Emitter`.
 */

module.exports = Emitter;

/**
 * Initialize a new `Emitter`.
 *
 * @api public
 */

function Emitter(obj) {
  if (obj) return mixin(obj);
};

/**
 * Mixin the emitter properties.
 *
 * @param {Object} obj
 * @return {Object}
 * @api private
 */

function mixin(obj) {
  for (var key in Emitter.prototype) {
    obj[key] = Emitter.prototype[key];
  }
  return obj;
}

/**
 * Listen on the given `event` with `fn`.
 *
 * @param {String} event
 * @param {Function} fn
 * @return {Emitter}
 * @api public
 */

Emitter.prototype.on =
Emitter.prototype.addEventListener = function(event, fn){
  this._callbacks = this._callbacks || {};
  (this._callbacks['$' + event] = this._callbacks['$' + event] || [])
    .push(fn);
  return this;
};

/**
 * Adds an `event` listener that will be invoked a single
 * time then automatically removed.
 *
 * @param {String} event
 * @param {Function} fn
 * @return {Emitter}
 * @api public
 */

Emitter.prototype.once = function(event, fn){
  function on() {
    this.off(event, on);
    fn.apply(this, arguments);
  }

  on.fn = fn;
  this.on(event, on);
  return this;
};

/**
 * Remove the given callback for `event` or all
 * registered callbacks.
 *
 * @param {String} event
 * @param {Function} fn
 * @return {Emitter}
 * @api public
 */

Emitter.prototype.off =
Emitter.prototype.removeListener =
Emitter.prototype.removeAllListeners =
Emitter.prototype.removeEventListener = function(event, fn){
  this._callbacks = this._callbacks || {};

  // all
  if (0 == arguments.length) {
    this._callbacks = {};
    return this;
  }

  // specific event
  var callbacks = this._callbacks['$' + event];
  if (!callbacks) return this;

  // remove all handlers
  if (1 == arguments.length) {
    delete this._callbacks['$' + event];
    return this;
  }

  // remove specific handler
  var cb;
  for (var i = 0; i < callbacks.length; i++) {
    cb = callbacks[i];
    if (cb === fn || cb.fn === fn) {
      callbacks.splice(i, 1);
      break;
    }
  }
  return this;
};

/**
 * Emit `event` with the given args.
 *
 * @param {String} event
 * @param {Mixed} ...
 * @return {Emitter}
 */

Emitter.prototype.emit = function(event){
  this._callbacks = this._callbacks || {};
  var args = [].slice.call(arguments, 1)
    , callbacks = this._callbacks['$' + event];

  if (callbacks) {
    callbacks = callbacks.slice(0);
    for (var i = 0, len = callbacks.length; i < len; ++i) {
      callbacks[i].apply(this, args);
    }
  }

  return this;
};

/**
 * Return array of callbacks for `event`.
 *
 * @param {String} event
 * @return {Array}
 * @api public
 */

Emitter.prototype.listeners = function(event){
  this._callbacks = this._callbacks || {};
  return this._callbacks['$' + event] || [];
};

/**
 * Check if this emitter has `event` handlers.
 *
 * @param {String} event
 * @return {Boolean}
 * @api public
 */

Emitter.prototype.hasListeners = function(event){
  return !! this.listeners(event).length;
};

},{}],9:[function(require,module,exports){
'use strict';

/**
 * Constants.
 */

var errorMessage;

errorMessage = 'An argument without append, prepend, ' +
    'or detach methods was given to `List';

/**
 * Creates a new List: A linked list is a bit like an Array, but
 * knows nothing about how many items are in it, and knows only about its
 * first (`head`) and last (`tail`) items. Each item (e.g. `head`, `tail`,
 * &c.) knows which item comes before or after it (its more like the
 * implementation of the DOM in JavaScript).
 * @global
 * @private
 * @constructor
 * @class Represents an instance of List.
 */

function List(/*items...*/) {
    if (arguments.length) {
        return List.from(arguments);
    }
}

var ListPrototype;

ListPrototype = List.prototype;

/**
 * Creates a new list from the arguments (each a list item) passed in.
 * @name List.of
 * @param {...ListItem} [items] - Zero or more items to attach.
 * @returns {list} - A new instance of List.
 */

List.of = function (/*items...*/) {
    return List.from.call(this, arguments);
};

/**
 * Creates a new list from the given array-like object (each a list item)
 * passed in.
 * @name List.from
 * @param {ListItem[]} [items] - The items to append.
 * @returns {list} - A new instance of List.
 */
List.from = function (items) {
    var list = new this(), length, iterator, item;

    if (items && (length = items.length)) {
        iterator = -1;

        while (++iterator < length) {
            item = items[iterator];

            if (item !== null && item !== undefined) {
                list.append(item);
            }
        }
    }

    return list;
};

/**
 * List#head
 * Default to `null`.
 */
ListPrototype.head = null;

/**
 * List#tail
 * Default to `null`.
 */
ListPrototype.tail = null;

/**
 * Returns the list's items as an array. This does *not* detach the items.
 * @name List#toArray
 * @returns {ListItem[]} - An array of (still attached) ListItems.
 */
ListPrototype.toArray = function () {
    var item = this.head,
        result = [];

    while (item) {
        result.push(item);
        item = item.next;
    }

    return result;
};

/**
 * Prepends the given item to the list: Item will be the new first item
 * (`head`).
 * @name List#prepend
 * @param {ListItem} item - The item to prepend.
 * @returns {ListItem} - An instance of ListItem (the given item).
 */
ListPrototype.prepend = function (item) {
    if (!item) {
        return false;
    }

    if (!item.append || !item.prepend || !item.detach) {
        throw new Error(errorMessage + '#prepend`.');
    }

    var self, head;

    // Cache self.
    self = this;

    // If self has a first item, defer prepend to the first items prepend
    // method, and return the result.
    head = self.head;

    if (head) {
        return head.prepend(item);
    }

    // ...otherwise, there is no `head` (or `tail`) item yet.

    // Detach the prependee.
    item.detach();

    // Set the prependees parent list to reference self.
    item.list = self;

    // Set self's first item to the prependee, and return the item.
    self.head = item;

    return item;
};

/**
 * Appends the given item to the list: Item will be the new last item (`tail`)
 * if the list had a first item, and its first item (`head`) otherwise.
 * @name List#append
 * @param {ListItem} item - The item to append.
 * @returns {ListItem} - An instance of ListItem (the given item).
 */

ListPrototype.append = function (item) {
    if (!item) {
        return false;
    }

    if (!item.append || !item.prepend || !item.detach) {
        throw new Error(errorMessage + '#append`.');
    }

    var self, head, tail;

    // Cache self.
    self = this;

    // If self has a last item, defer appending to the last items append
    // method, and return the result.
    tail = self.tail;

    if (tail) {
        return tail.append(item);
    }

    // If self has a first item, defer appending to the first items append
    // method, and return the result.
    head = self.head;

    if (head) {
        return head.append(item);
    }

    // ...otherwise, there is no `tail` or `head` item yet.

    // Detach the appendee.
    item.detach();

    // Set the appendees parent list to reference self.
    item.list = self;

    // Set self's first item to the appendee, and return the item.
    self.head = item;

    return item;
};

/**
 * Creates a new ListItem: A linked list item is a bit like DOM node:
 * It knows only about its "parent" (`list`), the item before it (`prev`),
 * and the item after it (`next`).
 * @global
 * @private
 * @constructor
 * @class Represents an instance of ListItem.
 */

function ListItem() {}

List.Item = ListItem;

var ListItemPrototype = ListItem.prototype;

ListItemPrototype.next = null;

ListItemPrototype.prev = null;

ListItemPrototype.list = null;

/**
 * Detaches the item operated on from its parent list.
 * @name ListItem#detach
 * @returns {ListItem} - The item operated on.
 */
ListItemPrototype.detach = function () {
    // Cache self, the parent list, and the previous and next items.
    var self = this,
        list = self.list,
        prev = self.prev,
        next = self.next;

    // If the item is already detached, return self.
    if (!list) {
        return self;
    }

    // If self is the last item in the parent list, link the lists last item
    // to the previous item.
    if (list.tail === self) {
        list.tail = prev;
    }

    // If self is the first item in the parent list, link the lists first item
    // to the next item.
    if (list.head === self) {
        list.head = next;
    }

    // If both the last and first items in the parent list are the same,
    // remove the link to the last item.
    if (list.tail === list.head) {
        list.tail = null;
    }

    // If a previous item exists, link its next item to selfs next item.
    if (prev) {
        prev.next = next;
    }

    // If a next item exists, link its previous item to selfs previous item.
    if (next) {
        next.prev = prev;
    }

    // Remove links from self to both the next and previous items, and to the
    // parent list.
    self.prev = self.next = self.list = null;

    // Return self.
    return self;
};

/**
 * Prepends the given item *before* the item operated on.
 * @name ListItem#prepend
 * @param {ListItem} item - The item to prepend.
 * @returns {ListItem} - The item operated on, or false when that item is not
 * attached.
 */
ListItemPrototype.prepend = function (item) {
    if (!item || !item.append || !item.prepend || !item.detach) {
        throw new Error(errorMessage + 'Item#prepend`.');
    }

    // Cache self, the parent list, and the previous item.
    var self = this,
        list = self.list,
        prev = self.prev;

    // If self is detached, return false.
    if (!list) {
        return false;
    }

    // Detach the prependee.
    item.detach();

    // If self has a previous item...
    if (prev) {
        // ...link the prependees previous item, to selfs previous item.
        item.prev = prev;

        // ...link the previous items next item, to self.
        prev.next = item;
    }

    // Set the prependees next item to self.
    item.next = self;

    // Set the prependees parent list to selfs parent list.
    item.list = list;

    // Set the previous item of self to the prependee.
    self.prev = item;

    // If self is the first item in the parent list, link the lists first item
    // to the prependee.
    if (self === list.head) {
        list.head = item;
    }

    // If the the parent list has no last item, link the lists last item to
    // self.
    if (!list.tail) {
        list.tail = self;
    }

    // Return the prependee.
    return item;
};

/**
 * Appends the given item *after* the item operated on.
 * @name ListItem#append
 * @param {ListItem} item - The item to append.
 * @returns {ListItem} - The item operated on, or false when that item is not
 * attached.
 */
ListItemPrototype.append = function (item) {
    // If item is falsey, return false.
    if (!item || !item.append || !item.prepend || !item.detach) {
        throw new Error(errorMessage + 'Item#append`.');
    }

    // Cache self, the parent list, and the next item.
    var self = this,
        list = self.list,
        next = self.next;

    // If self is detached, return false.
    if (!list) {
        return false;
    }

    // Detach the appendee.
    item.detach();

    // If self has a next item...
    if (next) {
        // ...link the appendees next item, to selfs next item.
        item.next = next;

        // ...link the next items previous item, to the appendee.
        next.prev = item;
    }

    // Set the appendees previous item to self.
    item.prev = self;

    // Set the appendees parent list to selfs parent list.
    item.list = list;

    // Set the next item of self to the appendee.
    self.next = item;

    // If the the parent list has no last item or if self is the parent lists
    // last item, link the lists last item to the appendee.
    if (self === list.tail || !list.tail) {
        list.tail = item;
    }

    // Return the appendee.
    return item;
};

/**
 * Expose `List`.
 */

module.exports = List;

},{}],10:[function(require,module,exports){
'use strict';

module.exports = require('./_source/linked-list.js');

},{"./_source/linked-list.js":9}],11:[function(require,module,exports){
var SCEmitter = require('sc-emitter').SCEmitter;

var SCChannel = function (name, client, options) {
  var self = this;

  SCEmitter.call(this);

  this.PENDING = 'pending';
  this.SUBSCRIBED = 'subscribed';
  this.UNSUBSCRIBED = 'unsubscribed';

  this.name = name;
  this.state = this.UNSUBSCRIBED;
  this.client = client;

  this.options = options || {};
  this.waitForAuth = this.options.waitForAuth || false;
};

SCChannel.prototype = Object.create(SCEmitter.prototype);

SCChannel.prototype.getState = function () {
  return this.state;
};

SCChannel.prototype.subscribe = function () {
  this.client.subscribe(this.name);
};

SCChannel.prototype.unsubscribe = function () {
  this.client.unsubscribe(this.name);
};

SCChannel.prototype.isSubscribed = function (includePending) {
  return this.client.isSubscribed(this.name, includePending);
};

SCChannel.prototype.publish = function (data, callback) {
  this.client.publish(this.name, data, callback);
};

SCChannel.prototype.watch = function (handler) {
  this.client.watch(this.name, handler);
};

SCChannel.prototype.unwatch = function (handler) {
  this.client.unwatch(this.name, handler);
};

SCChannel.prototype.watchers = function () {
  return this.client.watchers(this.name);
};

SCChannel.prototype.destroy = function () {
  this.client.destroyChannel(this.name);
};

module.exports.SCChannel = SCChannel;

},{"sc-emitter":12}],12:[function(require,module,exports){
var Emitter = require('component-emitter');

if (!Object.create) {
  Object.create = require('./objectcreate');
}

var SCEmitter = function () {
  Emitter.call(this);
};

SCEmitter.prototype = Object.create(Emitter.prototype);

SCEmitter.prototype.emit = function (event) {
  if (event == 'error' && this.domain) {
    // Emit the error on the domain if it has one.
    // See https://github.com/joyent/node/blob/ef4344311e19a4f73c031508252b21712b22fe8a/lib/events.js#L78-85
    
    var err = arguments[1];
    
    if (!err) {
      err = new Error('Uncaught, unspecified "error" event.');
    }
    err.domainEmitter = this;
    err.domain = this.domain;
    err.domainThrown = false;
    this.domain.emit('error', err);
  }
  Emitter.prototype.emit.apply(this, arguments);
};

module.exports.SCEmitter = SCEmitter;

},{"./objectcreate":13,"component-emitter":8}],13:[function(require,module,exports){
module.exports.create = (function () {
  function F() {};

  return function (o) {
    if (arguments.length != 1) {
      throw new Error('Object.create implementation only accepts one parameter.');
    }
    F.prototype = o;
    return new F();
  }
})();
},{}],14:[function(require,module,exports){
var cycle = require('cycle');

var isStrict = (function () { return !this; })();

function AuthTokenExpiredError(message, expiry) {
  if (Error.captureStackTrace && !isStrict) {
    Error.captureStackTrace(this, arguments.callee);
  } else {
    this.stack = (new Error()).stack;
  }
  this.name = 'AuthTokenExpiredError';
  this.message = message;
  this.expiry = expiry;
};
AuthTokenExpiredError.prototype = Object.create(Error.prototype);


function AuthTokenInvalidError(message) {
  if (Error.captureStackTrace && !isStrict) {
    Error.captureStackTrace(this, arguments.callee);
  } else {
    this.stack = (new Error()).stack;
  }
  this.name = 'AuthTokenInvalidError';
  this.message = message;
};
AuthTokenInvalidError.prototype = Object.create(Error.prototype);


function SilentMiddlewareBlockedError(message, type) {
  if (Error.captureStackTrace && !isStrict) {
    Error.captureStackTrace(this, arguments.callee);
  } else {
    this.stack = (new Error()).stack;
  }
  this.name = 'SilentMiddlewareBlockedError';
  this.message = message;
  this.type = type;
};
SilentMiddlewareBlockedError.prototype = Object.create(Error.prototype);


function InvalidActionError(message) {
  if (Error.captureStackTrace && !isStrict) {
    Error.captureStackTrace(this, arguments.callee);
  } else {
    this.stack = (new Error()).stack;
  }
  this.name = 'InvalidActionError';
  this.message = message;
};
InvalidActionError.prototype = Object.create(Error.prototype);

function InvalidArgumentsError(message) {
  if (Error.captureStackTrace && !isStrict) {
    Error.captureStackTrace(this, arguments.callee);
  } else {
    this.stack = (new Error()).stack;
  }
  this.name = 'InvalidArgumentsError';
  this.message = message;
};
InvalidArgumentsError.prototype = Object.create(Error.prototype);

function InvalidOptionsError(message) {
  if (Error.captureStackTrace && !isStrict) {
    Error.captureStackTrace(this, arguments.callee);
  } else {
    this.stack = (new Error()).stack;
  }
  this.name = 'InvalidOptionsError';
  this.message = message;
};
InvalidOptionsError.prototype = Object.create(Error.prototype);


function InvalidMessageError(message) {
  if (Error.captureStackTrace && !isStrict) {
    Error.captureStackTrace(this, arguments.callee);
  } else {
    this.stack = (new Error()).stack;
  }
  this.name = 'InvalidMessageError';
  this.message = message;
};
InvalidMessageError.prototype = Object.create(Error.prototype);


function SocketProtocolError(message, code) {
  if (Error.captureStackTrace && !isStrict) {
    Error.captureStackTrace(this, arguments.callee);
  } else {
    this.stack = (new Error()).stack;
  }
  this.name = 'SocketProtocolError';
  this.message = message;
  this.code = code;
};
SocketProtocolError.prototype = Object.create(Error.prototype);


function ServerProtocolError(message) {
  if (Error.captureStackTrace && !isStrict) {
    Error.captureStackTrace(this, arguments.callee);
  } else {
    this.stack = (new Error()).stack;
  }
  this.name = 'ServerProtocolError';
  this.message = message;
};
ServerProtocolError.prototype = Object.create(Error.prototype);

function HTTPServerError(message) {
  if (Error.captureStackTrace && !isStrict) {
    Error.captureStackTrace(this, arguments.callee);
  } else {
    this.stack = (new Error()).stack;
  }
  this.name = 'HTTPServerError';
  this.message = message;
};
HTTPServerError.prototype = Object.create(Error.prototype);


function ResourceLimitError(message) {
  if (Error.captureStackTrace && !isStrict) {
    Error.captureStackTrace(this, arguments.callee);
  } else {
    this.stack = (new Error()).stack;
  }
  this.name = 'ResourceLimitError';
  this.message = message;
};
ResourceLimitError.prototype = Object.create(Error.prototype);


function TimeoutError(message) {
  if (Error.captureStackTrace && !isStrict) {
    Error.captureStackTrace(this, arguments.callee);
  } else {
    this.stack = (new Error()).stack;
  }
  this.name = 'TimeoutError';
  this.message = message;
};
TimeoutError.prototype = Object.create(Error.prototype);


function BrokerError(message) {
  if (Error.captureStackTrace && !isStrict) {
    Error.captureStackTrace(this, arguments.callee);
  } else {
    this.stack = (new Error()).stack;
  }
  this.name = 'BrokerError';
  this.message = message;
};
BrokerError.prototype = Object.create(Error.prototype);


function ProcessExitError(message, code) {
  if (Error.captureStackTrace && !isStrict) {
    Error.captureStackTrace(this, arguments.callee);
  } else {
    this.stack = (new Error()).stack;
  }
  this.name = 'ProcessExitError';
  this.message = message;
  this.code = code;
};
ProcessExitError.prototype = Object.create(Error.prototype);


function UnknownError(message) {
  if (Error.captureStackTrace && !isStrict) {
    Error.captureStackTrace(this, arguments.callee);
  } else {
    this.stack = (new Error()).stack;
  }
  this.name = 'UnknownError';
  this.message = message;
};
UnknownError.prototype = Object.create(Error.prototype);


// Expose all error types

module.exports = {
  AuthTokenExpiredError: AuthTokenExpiredError,
  AuthTokenInvalidError: AuthTokenInvalidError,
  SilentMiddlewareBlockedError: SilentMiddlewareBlockedError,
  InvalidActionError: InvalidActionError,
  InvalidArgumentsError: InvalidArgumentsError,
  InvalidOptionsError: InvalidOptionsError,
  InvalidMessageError: InvalidMessageError,
  SocketProtocolError: SocketProtocolError,
  ServerProtocolError: ServerProtocolError,
  HTTPServerError: HTTPServerError,
  ResourceLimitError: ResourceLimitError,
  TimeoutError: TimeoutError,
  BrokerError: BrokerError,
  ProcessExitError: ProcessExitError,
  UnknownError: UnknownError
};

module.exports.socketProtocolErrorStatuses = {
  1001: 'Socket was disconnected',
  1002: 'A WebSocket protocol error was encountered',
  1003: 'Server terminated socket because it received invalid data',
  1005: 'Socket closed without status code',
  1006: 'Socket hung up',
  1007: 'Message format was incorrect',
  1008: 'Encountered a policy violation',
  1009: 'Message was too big to process',
  1010: 'Client ended the connection because the server did not comply with extension requirements',
  1011: 'Server encountered an unexpected fatal condition',
  4000: 'Server ping timed out',
  4001: 'Client pong timed out',
  4002: 'Server failed to sign auth token',
  4003: 'Failed to complete handshake',
  4004: 'Client failed to save auth token',
  4005: 'Did not receive #handshake from client before timeout',
  4006: 'Failed to bind socket to message broker',
  4007: 'Client connection establishment timed out'
};

module.exports.socketProtocolIgnoreStatuses = {
  1000: 'Socket closed normally',
  1001: 'Socket hung up'
};

// Properties related to error domains cannot be serialized.
var unserializableErrorProperties = {
  domain: 1,
  domainEmitter: 1,
  domainThrown: 1
};

module.exports.dehydrateError = function (error, includeStackTrace) {
  var dehydratedError;
  if (typeof error == 'string') {
      dehydratedError = error;
  } else {
    dehydratedError = {
      message: error.message
    };
    if (includeStackTrace) {
      dehydratedError.stack = error.stack;
    }
    for (var i in error) {
      if (!unserializableErrorProperties[i]) {
        dehydratedError[i] = error[i];
      }
    }
  }
  return cycle.decycle(dehydratedError);
};

module.exports.hydrateError = function (error) {
  var hydratedError = null;
  if (error != null) {
    if (typeof error == 'string') {
      hydratedError = error;
    } else {
      hydratedError = new Error(error.message);
      for (var i in error) {
        if (error.hasOwnProperty(i)) {
          hydratedError[i] = error[i];
        }
      }
    }
  }
  return hydratedError;
};

},{"cycle":15}],15:[function(require,module,exports){
/*
    cycle.js
    2013-02-19

    Public Domain.

    NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.

    This code should be minified before deployment.
    See http://javascript.crockford.com/jsmin.html

    USE YOUR OWN COPY. IT IS EXTREMELY UNWISE TO LOAD CODE FROM SERVERS YOU DO
    NOT CONTROL.
*/

/*jslint evil: true, regexp: true */

/*members $ref, apply, call, decycle, hasOwnProperty, length, prototype, push,
    retrocycle, stringify, test, toString
*/

var cycle = exports;

cycle.decycle = function decycle(object) {
    'use strict';

// Make a deep copy of an object or array, assuring that there is at most
// one instance of each object or array in the resulting structure. The
// duplicate references (which might be forming cycles) are replaced with
// an object of the form
//      {$ref: PATH}
// where the PATH is a JSONPath string that locates the first occurance.
// So,
//      var a = [];
//      a[0] = a;
//      return JSON.stringify(JSON.decycle(a));
// produces the string '[{"$ref":"$"}]'.

// JSONPath is used to locate the unique object. $ indicates the top level of
// the object or array. [NUMBER] or [STRING] indicates a child member or
// property.

    var objects = [],   // Keep a reference to each unique object or array
        paths = [];     // Keep the path to each unique object or array

    return (function derez(value, path) {

// The derez recurses through the object, producing the deep copy.

        var i,          // The loop counter
            name,       // Property name
            nu;         // The new object or array

// typeof null === 'object', so go on if this value is really an object but not
// one of the weird builtin objects.

        if (typeof value === 'object' && value !== null &&
                !(value instanceof Boolean) &&
                !(value instanceof Date)    &&
                !(value instanceof Number)  &&
                !(value instanceof RegExp)  &&
                !(value instanceof String)) {

// If the value is an object or array, look to see if we have already
// encountered it. If so, return a $ref/path object. This is a hard way,
// linear search that will get slower as the number of unique objects grows.

            for (i = 0; i < objects.length; i += 1) {
                if (objects[i] === value) {
                    return {$ref: paths[i]};
                }
            }

// Otherwise, accumulate the unique value and its path.

            objects.push(value);
            paths.push(path);

// If it is an array, replicate the array.

            if (Object.prototype.toString.apply(value) === '[object Array]') {
                nu = [];
                for (i = 0; i < value.length; i += 1) {
                    nu[i] = derez(value[i], path + '[' + i + ']');
                }
            } else {

// If it is an object, replicate the object.

                nu = {};
                for (name in value) {
                    if (Object.prototype.hasOwnProperty.call(value, name)) {
                        nu[name] = derez(value[name],
                            path + '[' + JSON.stringify(name) + ']');
                    }
                }
            }
            return nu;
        }
        return value;
    }(object, '$'));
};


cycle.retrocycle = function retrocycle($) {
    'use strict';

// Restore an object that was reduced by decycle. Members whose values are
// objects of the form
//      {$ref: PATH}
// are replaced with references to the value found by the PATH. This will
// restore cycles. The object will be mutated.

// The eval function is used to locate the values described by a PATH. The
// root object is kept in a $ variable. A regular expression is used to
// assure that the PATH is extremely well formed. The regexp contains nested
// * quantifiers. That has been known to have extremely bad performance
// problems on some browsers for very long strings. A PATH is expected to be
// reasonably short. A PATH is allowed to belong to a very restricted subset of
// Goessner's JSONPath.

// So,
//      var s = '[{"$ref":"$"}]';
//      return JSON.retrocycle(JSON.parse(s));
// produces an array containing a single element which is the array itself.

    var px =
        /^\$(?:\[(?:\d+|\"(?:[^\\\"\u0000-\u001f]|\\([\\\"\/bfnrt]|u[0-9a-zA-Z]{4}))*\")\])*$/;

    (function rez(value) {

// The rez function walks recursively through the object looking for $ref
// properties. When it finds one that has a value that is a path, then it
// replaces the $ref object with a reference to the value that is found by
// the path.

        var i, item, name, path;

        if (value && typeof value === 'object') {
            if (Object.prototype.toString.apply(value) === '[object Array]') {
                for (i = 0; i < value.length; i += 1) {
                    item = value[i];
                    if (item && typeof item === 'object') {
                        path = item.$ref;
                        if (typeof path === 'string' && px.test(path)) {
                            value[i] = eval(path);
                        } else {
                            rez(item);
                        }
                    }
                }
            } else {
                for (name in value) {
                    if (typeof value[name] === 'object') {
                        item = value[name];
                        if (item) {
                            path = item.$ref;
                            if (typeof path === 'string' && px.test(path)) {
                                value[name] = eval(path);
                            } else {
                                rez(item);
                            }
                        }
                    }
                }
            }
        }
    }($));
    return $;
};

},{}],16:[function(require,module,exports){
(function (global){
var base64Chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

module.exports.parse = function (input) {
  if (input == null) {
   return null;
  }
  var message = input.toString();
  
  try {
    return JSON.parse(message);
  } catch (err) {}
  return message;
};

var arrayBufferToBase64 = function (arraybuffer) {
  var bytes = new Uint8Array(arraybuffer);
  var len = bytes.length;
  var base64 = '';

  for (var i = 0; i < len; i += 3) {
    base64 += base64Chars[bytes[i] >> 2];
    base64 += base64Chars[((bytes[i] & 3) << 4) | (bytes[i + 1] >> 4)];
    base64 += base64Chars[((bytes[i + 1] & 15) << 2) | (bytes[i + 2] >> 6)];
    base64 += base64Chars[bytes[i + 2] & 63];
  }

  if ((len % 3) === 2) {
    base64 = base64.substring(0, base64.length - 1) + '=';
  } else if (len % 3 === 1) {
    base64 = base64.substring(0, base64.length - 2) + '==';
  }

  return base64;
};

var isOwnDescendant = function (object, ancestors) {
  for (var i in ancestors) {
    if (ancestors.hasOwnProperty(i)) {
      if (ancestors[i] === object) {
        return true;
      }
    }
  }
  return false;
};

var convertBuffersToBase64 = function (object, ancestors) {
  if (!ancestors) {
    ancestors = [];
  }
  if (isOwnDescendant(object, ancestors)) {
    throw new Error('Cannot traverse circular structure');
  }
  var newAncestors = ancestors.concat([object]);
  
  if (global.ArrayBuffer && object instanceof global.ArrayBuffer) {
    object = {
      base64: true,
      data: arrayBufferToBase64(object)
    };
  } else if (global.Buffer && object instanceof global.Buffer) {
    object = {
      base64: true,
      data: object.toString('base64')
    };
  } else if (object instanceof Array) {
    for (var i in object) {
      if (object.hasOwnProperty(i)) {
        object[i] = convertBuffersToBase64(object[i], newAncestors);
      }
    }
  } else if (object instanceof Object) {
    for (var j in object) {
      if (object.hasOwnProperty(j)) {
        object[j] = convertBuffersToBase64(object[j], newAncestors);
      }
    }
  }
  return object;
};

module.exports.stringify = function (object) {
  var base64Object = convertBuffersToBase64(object);
  return JSON.stringify(base64Object);
};

}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{}],17:[function(require,module,exports){

/**
 * Module dependencies.
 */

var global = typeof window != 'undefined' && window || (function() { return this; })();

/**
 * WebSocket constructor.
 */

var WebSocket = global.WebSocket || global.MozWebSocket;

/**
 * Module exports.
 */

module.exports = WebSocket ? ws : null;

/**
 * WebSocket constructor.
 *
 * The third `opts` options object gets ignored in web browsers, since it's
 * non-standard, and throws a TypeError if passed to the constructor.
 * See: https://github.com/einaros/ws/issues/227
 *
 * @param {String} uri
 * @param {Array} protocols (optional)
 * @param {Object} opts (optional)
 * @api public
 */

function ws(uri, protocols, opts) {
  var instance;
  if (protocols) {
    instance = new WebSocket(uri, protocols);
  } else {
    instance = new WebSocket(uri);
  }
  return instance;
}

if (WebSocket) ws.prototype = WebSocket.prototype;

},{}],18:[function(require,module,exports){
;(function (exports) {
  'use strict'

  var lookup = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'

  var Arr = (typeof Uint8Array !== 'undefined')
    ? Uint8Array
    : Array

  var PLUS = '+'.charCodeAt(0)
  var SLASH = '/'.charCodeAt(0)
  var NUMBER = '0'.charCodeAt(0)
  var LOWER = 'a'.charCodeAt(0)
  var UPPER = 'A'.charCodeAt(0)
  var PLUS_URL_SAFE = '-'.charCodeAt(0)
  var SLASH_URL_SAFE = '_'.charCodeAt(0)

  function decode (elt) {
    var code = elt.charCodeAt(0)
    if (code === PLUS || code === PLUS_URL_SAFE) return 62 // '+'
    if (code === SLASH || code === SLASH_URL_SAFE) return 63 // '/'
    if (code < NUMBER) return -1 // no match
    if (code < NUMBER + 10) return code - NUMBER + 26 + 26
    if (code < UPPER + 26) return code - UPPER
    if (code < LOWER + 26) return code - LOWER + 26
  }

  function b64ToByteArray (b64) {
    var i, j, l, tmp, placeHolders, arr

    if (b64.length % 4 > 0) {
      throw new Error('Invalid string. Length must be a multiple of 4')
    }

    // the number of equal signs (place holders)
    // if there are two placeholders, than the two characters before it
    // represent one byte
    // if there is only one, then the three characters before it represent 2 bytes
    // this is just a cheap hack to not do indexOf twice
    var len = b64.length
    placeHolders = b64.charAt(len - 2) === '=' ? 2 : b64.charAt(len - 1) === '=' ? 1 : 0

    // base64 is 4/3 + up to two characters of the original data
    arr = new Arr(b64.length * 3 / 4 - placeHolders)

    // if there are placeholders, only get up to the last complete 4 chars
    l = placeHolders > 0 ? b64.length - 4 : b64.length

    var L = 0

    function push (v) {
      arr[L++] = v
    }

    for (i = 0, j = 0; i < l; i += 4, j += 3) {
      tmp = (decode(b64.charAt(i)) << 18) | (decode(b64.charAt(i + 1)) << 12) | (decode(b64.charAt(i + 2)) << 6) | decode(b64.charAt(i + 3))
      push((tmp & 0xFF0000) >> 16)
      push((tmp & 0xFF00) >> 8)
      push(tmp & 0xFF)
    }

    if (placeHolders === 2) {
      tmp = (decode(b64.charAt(i)) << 2) | (decode(b64.charAt(i + 1)) >> 4)
      push(tmp & 0xFF)
    } else if (placeHolders === 1) {
      tmp = (decode(b64.charAt(i)) << 10) | (decode(b64.charAt(i + 1)) << 4) | (decode(b64.charAt(i + 2)) >> 2)
      push((tmp >> 8) & 0xFF)
      push(tmp & 0xFF)
    }

    return arr
  }

  function uint8ToBase64 (uint8) {
    var i
    var extraBytes = uint8.length % 3 // if we have 1 byte left, pad 2 bytes
    var output = ''
    var temp, length

    function encode (num) {
      return lookup.charAt(num)
    }

    function tripletToBase64 (num) {
      return encode(num >> 18 & 0x3F) + encode(num >> 12 & 0x3F) + encode(num >> 6 & 0x3F) + encode(num & 0x3F)
    }

    // go through the array every three bytes, we'll deal with trailing stuff later
    for (i = 0, length = uint8.length - extraBytes; i < length; i += 3) {
      temp = (uint8[i] << 16) + (uint8[i + 1] << 8) + (uint8[i + 2])
      output += tripletToBase64(temp)
    }

    // pad the end with zeros, but make sure to not forget the extra bytes
    switch (extraBytes) {
      case 1:
        temp = uint8[uint8.length - 1]
        output += encode(temp >> 2)
        output += encode((temp << 4) & 0x3F)
        output += '=='
        break
      case 2:
        temp = (uint8[uint8.length - 2] << 8) + (uint8[uint8.length - 1])
        output += encode(temp >> 10)
        output += encode((temp >> 4) & 0x3F)
        output += encode((temp << 2) & 0x3F)
        output += '='
        break
      default:
        break
    }

    return output
  }

  exports.toByteArray = b64ToByteArray
  exports.fromByteArray = uint8ToBase64
}(typeof exports === 'undefined' ? (this.base64js = {}) : exports))

},{}],19:[function(require,module,exports){
(function (global){
/*!
 * The buffer module from node.js, for the browser.
 *
 * @author   Feross Aboukhadijeh <feross@feross.org> <http://feross.org>
 * @license  MIT
 */
/* eslint-disable no-proto */

'use strict'

var base64 = require('base64-js')
var ieee754 = require('ieee754')
var isArray = require('isarray')

exports.Buffer = Buffer
exports.SlowBuffer = SlowBuffer
exports.INSPECT_MAX_BYTES = 50
Buffer.poolSize = 8192 // not used by this implementation

var rootParent = {}

/**
 * If `Buffer.TYPED_ARRAY_SUPPORT`:
 *   === true    Use Uint8Array implementation (fastest)
 *   === false   Use Object implementation (most compatible, even IE6)
 *
 * Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,
 * Opera 11.6+, iOS 4.2+.
 *
 * Due to various browser bugs, sometimes the Object implementation will be used even
 * when the browser supports typed arrays.
 *
 * Note:
 *
 *   - Firefox 4-29 lacks support for adding new properties to `Uint8Array` instances,
 *     See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438.
 *
 *   - Chrome 9-10 is missing the `TypedArray.prototype.subarray` function.
 *
 *   - IE10 has a broken `TypedArray.prototype.subarray` function which returns arrays of
 *     incorrect length in some situations.

 * We detect these buggy browsers and set `Buffer.TYPED_ARRAY_SUPPORT` to `false` so they
 * get the Object implementation, which is slower but behaves correctly.
 */
Buffer.TYPED_ARRAY_SUPPORT = global.TYPED_ARRAY_SUPPORT !== undefined
  ? global.TYPED_ARRAY_SUPPORT
  : typedArraySupport()

function typedArraySupport () {
  try {
    var arr = new Uint8Array(1)
    arr.foo = function () { return 42 }
    return arr.foo() === 42 && // typed array instances can be augmented
        typeof arr.subarray === 'function' && // chrome 9-10 lack `subarray`
        arr.subarray(1, 1).byteLength === 0 // ie10 has broken `subarray`
  } catch (e) {
    return false
  }
}

function kMaxLength () {
  return Buffer.TYPED_ARRAY_SUPPORT
    ? 0x7fffffff
    : 0x3fffffff
}

/**
 * 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 (arg) {
  if (!(this instanceof Buffer)) {
    // Avoid going through an ArgumentsAdaptorTrampoline in the common case.
    if (arguments.length > 1) return new Buffer(arg, arguments[1])
    return new Buffer(arg)
  }

  if (!Buffer.TYPED_ARRAY_SUPPORT) {
    this.length = 0
    this.parent = undefined
  }

  // Common case.
  if (typeof arg === 'number') {
    return fromNumber(this, arg)
  }

  // Slightly less common case.
  if (typeof arg === 'string') {
    return fromString(this, arg, arguments.length > 1 ? arguments[1] : 'utf8')
  }

  // Unusual.
  return fromObject(this, arg)
}

function fromNumber (that, length) {
  that = allocate(that, length < 0 ? 0 : checked(length) | 0)
  if (!Buffer.TYPED_ARRAY_SUPPORT) {
    for (var i = 0; i < length; i++) {
      that[i] = 0
    }
  }
  return that
}

function fromString (that, string, encoding) {
  if (typeof encoding !== 'string' || encoding === '') encoding = 'utf8'

  // Assumption: byteLength() return value is always < kMaxLength.
  var length = byteLength(string, encoding) | 0
  that = allocate(that, length)

  that.write(string, encoding)
  return that
}

function fromObject (that, object) {
  if (Buffer.isBuffer(object)) return fromBuffer(that, object)

  if (isArray(object)) return fromArray(that, object)

  if (object == null) {
    throw new TypeError('must start with number, buffer, array or string')
  }

  if (typeof ArrayBuffer !== 'undefined') {
    if (object.buffer instanceof ArrayBuffer) {
      return fromTypedArray(that, object)
    }
    if (object instanceof ArrayBuffer) {
      return fromArrayBuffer(that, object)
    }
  }

  if (object.length) return fromArrayLike(that, object)

  return fromJsonObject(that, object)
}

function fromBuffer (that, buffer) {
  var length = checked(buffer.length) | 0
  that = allocate(that, length)
  buffer.copy(that, 0, 0, length)
  return that
}

function fromArray (that, array) {
  var length = checked(array.length) | 0
  that = allocate(that, length)
  for (var i = 0; i < length; i += 1) {
    that[i] = array[i] & 255
  }
  return that
}

// Duplicate of fromArray() to keep fromArray() monomorphic.
function fromTypedArray (that, array) {
  var length = checked(array.length) | 0
  that = allocate(that, length)
  // Truncating the elements is probably not what people expect from typed
  // arrays with BYTES_PER_ELEMENT > 1 but it's compatible with the behavior
  // of the old Buffer constructor.
  for (var i = 0; i < length; i += 1) {
    that[i] = array[i] & 255
  }
  return that
}

function fromArrayBuffer (that, array) {
  array.byteLength // this throws if `array` is not a valid ArrayBuffer

  if (Buffer.TYPED_ARRAY_SUPPORT) {
    // Return an augmented `Uint8Array` instance, for best performance
    that = new Uint8Array(array)
    that.__proto__ = Buffer.prototype
  } else {
    // Fallback: Return an object instance of the Buffer class
    that = fromTypedArray(that, new Uint8Array(array))
  }
  return that
}

function fromArrayLike (that, array) {
  var length = checked(array.length) | 0
  that = allocate(that, length)
  for (var i = 0; i < length; i += 1) {
    that[i] = array[i] & 255
  }
  return that
}

// Deserialize { type: 'Buffer', data: [1,2,3,...] } into a Buffer object.
// Returns a zero-length buffer for inputs that don't conform to the spec.
function fromJsonObject (that, object) {
  var array
  var length = 0

  if (object.type === 'Buffer' && isArray(object.data)) {
    array = object.data
    length = checked(array.length) | 0
  }
  that = allocate(that, length)

  for (var i = 0; i < length; i += 1) {
    that[i] = array[i] & 255
  }
  return that
}

if (Buffer.TYPED_ARRAY_SUPPORT) {
  Buffer.prototype.__proto__ = Uint8Array.prototype
  Buffer.__proto__ = Uint8Array
} else {
  // pre-set for values that may exist in the future
  Buffer.prototype.length = undefined
  Buffer.prototype.parent = undefined
}

function allocate (that, length) {
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    // Return an augmented `Uint8Array` instance, for best performance
    that = new Uint8Array(length)
    that.__proto__ = Buffer.prototype
  } else {
    // Fallback: Return an object instance of the Buffer class
    that.length = length
  }

  var fromPool = length !== 0 && length <= Buffer.poolSize >>> 1
  if (fromPool) that.parent = rootParent

  return that
}

function checked (length) {
  // Note: cannot use `length < kMaxLength` here because that fails when
  // length is NaN (which is otherwise coerced to zero.)
  if (length >= kMaxLength()) {
    throw new RangeError('Attempt to allocate Buffer larger than maximum ' +
                         'size: 0x' + kMaxLength().toString(16) + ' bytes')
  }
  return length | 0
}

function SlowBuffer (subject, encoding) {
  if (!(this instanceof SlowBuffer)) return new SlowBuffer(subject, encoding)

  var buf = new Buffer(subject, encoding)
  delete buf.parent
  return buf
}

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

Buffer.compare = function compare (a, b) {
  if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) {
    throw new TypeError('Arguments must be Buffers')
  }

  if (a === b) return 0

  var x = a.length
  var y = b.length

  var i = 0
  var len = Math.min(x, y)
  while (i < len) {
    if (a[i] !== b[i]) break

    ++i
  }

  if (i !== len) {
    x = a[i]
    y = b[i]
  }

  if (x < y) return -1
  if (y < x) return 1
  return 0
}

Buffer.isEncoding = function isEncoding (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.concat = function concat (list, length) {
  if (!isArray(list)) throw new TypeError('list argument must be an Array of Buffers.')

  if (list.length === 0) {
    return new Buffer(0)
  }

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

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

function byteLength (string, encoding) {
  if (typeof string !== 'string') string = '' + string

  var len = string.length
  if (len === 0) return 0

  // Use a for loop to avoid recursion
  var loweredCase = false
  for (;;) {
    switch (encoding) {
      case 'ascii':
      case 'binary':
      // Deprecated
      case 'raw':
      case 'raws':
        return len
      case 'utf8':
      case 'utf-8':
        return utf8ToBytes(string).length
      case 'ucs2':
      case 'ucs-2':
      case 'utf16le':
      case 'utf-16le':
        return len * 2
      case 'hex':
        return len >>> 1
      case 'base64':
        return base64ToBytes(string).length
      default:
        if (loweredCase) return utf8ToBytes(string).length // assume utf8
        encoding = ('' + encoding).toLowerCase()
        loweredCase = true
    }
  }
}
Buffer.byteLength = byteLength

function slowToString (encoding, start, end) {
  var loweredCase = false

  start = start | 0
  end = end === undefined || end === Infinity ? this.length : end | 0

  if (!encoding) encoding = 'utf8'
  if (start < 0) start = 0
  if (end > this.length) end = this.length
  if (end <= start) return ''

  while (true) {
    switch (encoding) {
      case 'hex':
        return hexSlice(this, start, end)

      case 'utf8':
      case 'utf-8':
        return utf8Slice(this, start, end)

      case 'ascii':
        return asciiSlice(this, start, end)

      case 'binary':
        return binarySlice(this, start, end)

      case 'base64':
        return base64Slice(this, start, end)

      case 'ucs2':
      case 'ucs-2':
      case 'utf16le':
      case 'utf-16le':
        return utf16leSlice(this, start, end)

      default:
        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
        encoding = (encoding + '').toLowerCase()
        loweredCase = true
    }
  }
}

// Even though this property is private, it shouldn't be removed because it is
// used by `is-buffer` to detect buffer instances in Safari 5-7.
Buffer.prototype._isBuffer = true

Buffer.prototype.toString = function toString () {
  var length = this.length | 0
  if (length === 0) return ''
  if (arguments.length === 0) return utf8Slice(this, 0, length)
  return slowToString.apply(this, arguments)
}

Buffer.prototype.equals = function equals (b) {
  if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')
  if (this === b) return true
  return Buffer.compare(this, b) === 0
}

Buffer.prototype.inspect = function inspect () {
  var str = ''
  var max = exports.INSPECT_MAX_BYTES
  if (this.length > 0) {
    str = this.toString('hex', 0, max).match(/.{2}/g).join(' ')
    if (this.length > max) str += ' ... '
  }
  return '<Buffer ' + str + '>'
}

Buffer.prototype.compare = function compare (b) {
  if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')
  if (this === b) return 0
  return Buffer.compare(this, b)
}

Buffer.prototype.indexOf = function indexOf (val, byteOffset) {
  if (byteOffset > 0x7fffffff) byteOffset = 0x7fffffff
  else if (byteOffset < -0x80000000) byteOffset = -0x80000000
  byteOffset >>= 0

  if (this.length === 0) return -1
  if (byteOffset >= this.length) return -1

  // Negative offsets start from the end of the buffer
  if (byteOffset < 0) byteOffset = Math.max(this.length + byteOffset, 0)

  if (typeof val === 'string') {
    if (val.length === 0) return -1 // special case: looking for empty string always fails
    return String.prototype.indexOf.call(this, val, byteOffset)
  }
  if (Buffer.isBuffer(val)) {
    return arrayIndexOf(this, val, byteOffset)
  }
  if (typeof val === 'number') {
    if (Buffer.TYPED_ARRAY_SUPPORT && Uint8Array.prototype.indexOf === 'function') {
      return Uint8Array.prototype.indexOf.call(this, val, byteOffset)
    }
    return arrayIndexOf(this, [ val ], byteOffset)
  }

  function arrayIndexOf (arr, val, byteOffset) {
    var foundIndex = -1
    for (var i = 0; byteOffset + i < arr.length; i++) {
      if (arr[byteOffset + i] === val[foundIndex === -1 ? 0 : i - foundIndex]) {
        if (foundIndex === -1) foundIndex = i
        if (i - foundIndex + 1 === val.length) return byteOffset + foundIndex
      } else {
        foundIndex = -1
      }
    }
    return -1
  }

  throw new TypeError('val must be string, number or Buffer')
}

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
  if (strLen % 2 !== 0) throw new Error('Invalid hex string')

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

function utf8Write (buf, string, offset, length) {
  return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length)
}

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

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

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

function ucs2Write (buf, string, offset, length) {
  return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length)
}

Buffer.prototype.write = function write (string, offset, length, encoding) {
  // Buffer#write(string)
  if (offset === undefined) {
    encoding = 'utf8'
    length = this.length
    offset = 0
  // Buffer#write(string, encoding)
  } else if (length === undefined && typeof offset === 'string') {
    encoding = offset
    length = this.length
    offset = 0
  // Buffer#write(string, offset[, length][, encoding])
  } else if (isFinite(offset)) {
    offset = offset | 0
    if (isFinite(length)) {
      length = length | 0
      if (encoding === undefined) encoding = 'utf8'
    } else {
      encoding = length
      length = undefined
    }
  // legacy write(string, encoding, offset, length) - remove in v0.13
  } else {
    var swap = encoding
    encoding = offset
    offset = length | 0
    length = swap
  }

  var remaining = this.length - offset
  if (length === undefined || length > remaining) length = remaining

  if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) {
    throw new RangeError('attempt to write outside buffer bounds')
  }

  if (!encoding) encoding = 'utf8'

  var loweredCase = false
  for (;;) {
    switch (encoding) {
      case 'hex':
        return hexWrite(this, string, offset, length)

      case 'utf8':
      case 'utf-8':
        return utf8Write(this, string, offset, length)

      case 'ascii':
        return asciiWrite(this, string, offset, length)

      case 'binary':
        return binaryWrite(this, string, offset, length)

      case 'base64':
        // Warning: maxLength not taken into account in base64Write
        return base64Write(this, string, offset, length)

      case 'ucs2':
      case 'ucs-2':
      case 'utf16le':
      case 'utf-16le':
        return ucs2Write(this, string, offset, length)

      default:
        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
        encoding = ('' + encoding).toLowerCase()
        loweredCase = true
    }
  }
}

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

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) {
  end = Math.min(buf.length, end)
  var res = []

  var i = start
  while (i < end) {
    var firstByte = buf[i]
    var codePoint = null
    var bytesPerSequence = (firstByte > 0xEF) ? 4
      : (firstByte > 0xDF) ? 3
      : (firstByte > 0xBF) ? 2
      : 1

    if (i + bytesPerSequence <= end) {
      var secondByte, thirdByte, fourthByte, tempCodePoint

      switch (bytesPerSequence) {
        case 1:
          if (firstByte < 0x80) {
            codePoint = firstByte
          }
          break
        case 2:
          secondByte = buf[i + 1]
          if ((secondByte & 0xC0) === 0x80) {
            tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F)
            if (tempCodePoint > 0x7F) {
              codePoint = tempCodePoint
            }
          }
          break
        case 3:
          secondByte = buf[i + 1]
          thirdByte = buf[i + 2]
          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80) {
            tempCodePoint = (firstByte & 0xF) << 0xC | (secondByte & 0x3F) << 0x6 | (thirdByte & 0x3F)
            if (tempCodePoint > 0x7FF && (tempCodePoint < 0xD800 || tempCodePoint > 0xDFFF)) {
              codePoint = tempCodePoint
            }
          }
          break
        case 4:
          secondByte = buf[i + 1]
          thirdByte = buf[i + 2]
          fourthByte = buf[i + 3]
          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80 && (fourthByte & 0xC0) === 0x80) {
            tempCodePoint = (firstByte & 0xF) << 0x12 | (secondByte & 0x3F) << 0xC | (thirdByte & 0x3F) << 0x6 | (fourthByte & 0x3F)
            if (tempCodePoint > 0xFFFF && tempCodePoint < 0x110000) {
              codePoint = tempCodePoint
            }
          }
      }
    }

    if (codePoint === null) {
      // we did not generate a valid codePoint so insert a
      // replacement char (U+FFFD) and advance only 1 byte
      codePoint = 0xFFFD
      bytesPerSequence = 1
    } else if (codePoint > 0xFFFF) {
      // encode to utf16 (surrogate pair dance)
      codePoint -= 0x10000
      res.push(codePoint >>> 10 & 0x3FF | 0xD800)
      codePoint = 0xDC00 | codePoint & 0x3FF
    }

    res.push(codePoint)
    i += bytesPerSequence
  }

  return decodeCodePointsArray(res)
}

// Based on http://stackoverflow.com/a/22747272/680742, the browser with
// the lowest limit is Chrome, with 0x10000 args.
// We go 1 magnitude less, for safety
var MAX_ARGUMENTS_LENGTH = 0x1000

function decodeCodePointsArray (codePoints) {
  var len = codePoints.length
  if (len <= MAX_ARGUMENTS_LENGTH) {
    return String.fromCharCode.apply(String, codePoints) // avoid extra slice()
  }

  // Decode in chunks to avoid "call stack size exceeded".
  var res = ''
  var i = 0
  while (i < len) {
    res += String.fromCharCode.apply(
      String,
      codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH)
    )
  }
  return res
}

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] & 0x7F)
  }
  return ret
}

function binarySlice (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 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 slice (start, end) {
  var len = this.length
  start = ~~start
  end = end === undefined ? len : ~~end

  if (start < 0) {
    start += len
    if (start < 0) start = 0
  } else if (start > len) {
    start = len
  }

  if (end < 0) {
    end += len
    if (end < 0) end = 0
  } else if (end > len) {
    end = len
  }

  if (end < start) end = start

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

  if (newBuf.length) newBuf.parent = this.parent || this

  return newBuf
}

/*
 * Need to make sure that buffer isn't trying to write out of bounds.
 */
function checkOffset (offset, ext, length) {
  if ((offset % 1) !== 0 || offset < 0) throw new RangeError('offset is not uint')
  if (offset + ext > length) throw new RangeError('Trying to access beyond buffer length')
}

Buffer.prototype.readUIntLE = function readUIntLE (offset, byteLength, noAssert) {
  offset = offset | 0
  byteLength = byteLength | 0
  if (!noAssert) checkOffset(offset, byteLength, this.length)

  var val = this[offset]
  var mul = 1
  var i = 0
  while (++i < byteLength && (mul *= 0x100)) {
    val += this[offset + i] * mul
  }

  return val
}

Buffer.prototype.readUIntBE = function readUIntBE (offset, byteLength, noAssert) {
  offset = offset | 0
  byteLength = byteLength | 0
  if (!noAssert) {
    checkOffset(offset, byteLength, this.length)
  }

  var val = this[offset + --byteLength]
  var mul = 1
  while (byteLength > 0 && (mul *= 0x100)) {
    val += this[offset + --byteLength] * mul
  }

  return val
}

Buffer.prototype.readUInt8 = function readUInt8 (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 1, this.length)
  return this[offset]
}

Buffer.prototype.readUInt16LE = function readUInt16LE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 2, this.length)
  return this[offset] | (this[offset + 1] << 8)
}

Buffer.prototype.readUInt16BE = function readUInt16BE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 2, this.length)
  return (this[offset] << 8) | this[offset + 1]
}

Buffer.prototype.readUInt32LE = function readUInt32LE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 4, this.length)

  return ((this[offset]) |
      (this[offset + 1] << 8) |
      (this[offset + 2] << 16)) +
      (this[offset + 3] * 0x1000000)
}

Buffer.prototype.readUInt32BE = function readUInt32BE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 4, this.length)

  return (this[offset] * 0x1000000) +
    ((this[offset + 1] << 16) |
    (this[offset + 2] << 8) |
    this[offset + 3])
}

Buffer.prototype.readIntLE = function readIntLE (offset, byteLength, noAssert) {
  offset = offset | 0
  byteLength = byteLength | 0
  if (!noAssert) checkOffset(offset, byteLength, this.length)

  var val = this[offset]
  var mul = 1
  var i = 0
  while (++i < byteLength && (mul *= 0x100)) {
    val += this[offset + i] * mul
  }
  mul *= 0x80

  if (val >= mul) val -= Math.pow(2, 8 * byteLength)

  return val
}

Buffer.prototype.readIntBE = function readIntBE (offset, byteLength, noAssert) {
  offset = offset | 0
  byteLength = byteLength | 0
  if (!noAssert) checkOffset(offset, byteLength, this.length)

  var i = byteLength
  var mul = 1
  var val = this[offset + --i]
  while (i > 0 && (mul *= 0x100)) {
    val += this[offset + --i] * mul
  }
  mul *= 0x80

  if (val >= mul) val -= Math.pow(2, 8 * byteLength)

  return val
}

Buffer.prototype.readInt8 = function readInt8 (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 1, this.length)
  if (!(this[offset] & 0x80)) return (this[offset])
  return ((0xff - this[offset] + 1) * -1)
}

Buffer.prototype.readInt16LE = function readInt16LE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 2, this.length)
  var val = this[offset] | (this[offset + 1] << 8)
  return (val & 0x8000) ? val | 0xFFFF0000 : val
}

Buffer.prototype.readInt16BE = function readInt16BE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 2, this.length)
  var val = this[offset + 1] | (this[offset] << 8)
  return (val & 0x8000) ? val | 0xFFFF0000 : val
}

Buffer.prototype.readInt32LE = function readInt32LE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 4, this.length)

  return (this[offset]) |
    (this[offset + 1] << 8) |
    (this[offset + 2] << 16) |
    (this[offset + 3] << 24)
}

Buffer.prototype.readInt32BE = function readInt32BE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 4, this.length)

  return (this[offset] << 24) |
    (this[offset + 1] << 16) |
    (this[offset + 2] << 8) |
    (this[offset + 3])
}

Buffer.prototype.readFloatLE = function readFloatLE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 4, this.length)
  return ieee754.read(this, offset, true, 23, 4)
}

Buffer.prototype.readFloatBE = function readFloatBE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 4, this.length)
  return ieee754.read(this, offset, false, 23, 4)
}

Buffer.prototype.readDoubleLE = function readDoubleLE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 8, this.length)
  return ieee754.read(this, offset, true, 52, 8)
}

Buffer.prototype.readDoubleBE = function readDoubleBE (offset, noAssert) {
  if (!noAssert) checkOffset(offset, 8, this.length)
  return ieee754.read(this, offset, false, 52, 8)
}

function checkInt (buf, value, offset, ext, max, min) {
  if (!Buffer.isBuffer(buf)) throw new TypeError('buffer must be a Buffer instance')
  if (value > max || value < min) throw new RangeError('value is out of bounds')
  if (offset + ext > buf.length) throw new RangeError('index out of range')
}

Buffer.prototype.writeUIntLE = function writeUIntLE (value, offset, byteLength, noAssert) {
  value = +value
  offset = offset | 0
  byteLength = byteLength | 0
  if (!noAssert) checkInt(this, value, offset, byteLength, Math.pow(2, 8 * byteLength), 0)

  var mul = 1
  var i = 0
  this[offset] = value & 0xFF
  while (++i < byteLength && (mul *= 0x100)) {
    this[offset + i] = (value / mul) & 0xFF
  }

  return offset + byteLength
}

Buffer.prototype.writeUIntBE = function writeUIntBE (value, offset, byteLength, noAssert) {
  value = +value
  offset = offset | 0
  byteLength = byteLength | 0
  if (!noAssert) checkInt(this, value, offset, byteLength, Math.pow(2, 8 * byteLength), 0)

  var i = byteLength - 1
  var mul = 1
  this[offset + i] = value & 0xFF
  while (--i >= 0 && (mul *= 0x100)) {
    this[offset + i] = (value / mul) & 0xFF
  }

  return offset + byteLength
}

Buffer.prototype.writeUInt8 = function writeUInt8 (value, offset, noAssert) {
  value = +value
  offset = offset | 0
  if (!noAssert) checkInt(this, value, offset, 1, 0xff, 0)
  if (!Buffer.TYPED_ARRAY_SUPPORT) value = Math.floor(value)
  this[offset] = (value & 0xff)
  return offset + 1
}

function objectWriteUInt16 (buf, value, offset, littleEndian) {
  if (value < 0) value = 0xffff + value + 1
  for (var i = 0, j = Math.min(buf.length - offset, 2); i < j; i++) {
    buf[offset + i] = (value & (0xff << (8 * (littleEndian ? i : 1 - i)))) >>>
      (littleEndian ? i : 1 - i) * 8
  }
}

Buffer.prototype.writeUInt16LE = function writeUInt16LE (value, offset, noAssert) {
  value = +value
  offset = offset | 0
  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    this[offset] = (value & 0xff)
    this[offset + 1] = (value >>> 8)
  } else {
    objectWriteUInt16(this, value, offset, true)
  }
  return offset + 2
}

Buffer.prototype.writeUInt16BE = function writeUInt16BE (value, offset, noAssert) {
  value = +value
  offset = offset | 0
  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    this[offset] = (value >>> 8)
    this[offset + 1] = (value & 0xff)
  } else {
    objectWriteUInt16(this, value, offset, false)
  }
  return offset + 2
}

function objectWriteUInt32 (buf, value, offset, littleEndian) {
  if (value < 0) value = 0xffffffff + value + 1
  for (var i = 0, j = Math.min(buf.length - offset, 4); i < j; i++) {
    buf[offset + i] = (value >>> (littleEndian ? i : 3 - i) * 8) & 0xff
  }
}

Buffer.prototype.writeUInt32LE = function writeUInt32LE (value, offset, noAssert) {
  value = +value
  offset = offset | 0
  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    this[offset + 3] = (value >>> 24)
    this[offset + 2] = (value >>> 16)
    this[offset + 1] = (value >>> 8)
    this[offset] = (value & 0xff)
  } else {
    objectWriteUInt32(this, value, offset, true)
  }
  return offset + 4
}

Buffer.prototype.writeUInt32BE = function writeUInt32BE (value, offset, noAssert) {
  value = +value
  offset = offset | 0
  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    this[offset] = (value >>> 24)
    this[offset + 1] = (value >>> 16)
    this[offset + 2] = (value >>> 8)
    this[offset + 3] = (value & 0xff)
  } else {
    objectWriteUInt32(this, value, offset, false)
  }
  return offset + 4
}

Buffer.prototype.writeIntLE = function writeIntLE (value, offset, byteLength, noAssert) {
  value = +value
  offset = offset | 0
  if (!noAssert) {
    var limit = Math.pow(2, 8 * byteLength - 1)

    checkInt(this, value, offset, byteLength, limit - 1, -limit)
  }

  var i = 0
  var mul = 1
  var sub = value < 0 ? 1 : 0
  this[offset] = value & 0xFF
  while (++i < byteLength && (mul *= 0x100)) {
    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
  }

  return offset + byteLength
}

Buffer.prototype.writeIntBE = function writeIntBE (value, offset, byteLength, noAssert) {
  value = +value
  offset = offset | 0
  if (!noAssert) {
    var limit = Math.pow(2, 8 * byteLength - 1)

    checkInt(this, value, offset, byteLength, limit - 1, -limit)
  }

  var i = byteLength - 1
  var mul = 1
  var sub = value < 0 ? 1 : 0
  this[offset + i] = value & 0xFF
  while (--i >= 0 && (mul *= 0x100)) {
    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
  }

  return offset + byteLength
}

Buffer.prototype.writeInt8 = function writeInt8 (value, offset, noAssert) {
  value = +value
  offset = offset | 0
  if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80)
  if (!Buffer.TYPED_ARRAY_SUPPORT) value = Math.floor(value)
  if (value < 0) value = 0xff + value + 1
  this[offset] = (value & 0xff)
  return offset + 1
}

Buffer.prototype.writeInt16LE = function writeInt16LE (value, offset, noAssert) {
  value = +value
  offset = offset | 0
  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    this[offset] = (value & 0xff)
    this[offset + 1] = (value >>> 8)
  } else {
    objectWriteUInt16(this, value, offset, true)
  }
  return offset + 2
}

Buffer.prototype.writeInt16BE = function writeInt16BE (value, offset, noAssert) {
  value = +value
  offset = offset | 0
  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    this[offset] = (value >>> 8)
    this[offset + 1] = (value & 0xff)
  } else {
    objectWriteUInt16(this, value, offset, false)
  }
  return offset + 2
}

Buffer.prototype.writeInt32LE = function writeInt32LE (value, offset, noAssert) {
  value = +value
  offset = offset | 0
  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    this[offset] = (value & 0xff)
    this[offset + 1] = (value >>> 8)
    this[offset + 2] = (value >>> 16)
    this[offset + 3] = (value >>> 24)
  } else {
    objectWriteUInt32(this, value, offset, true)
  }
  return offset + 4
}

Buffer.prototype.writeInt32BE = function writeInt32BE (value, offset, noAssert) {
  value = +value
  offset = offset | 0
  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
  if (value < 0) value = 0xffffffff + value + 1
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    this[offset] = (value >>> 24)
    this[offset + 1] = (value >>> 16)
    this[offset + 2] = (value >>> 8)
    this[offset + 3] = (value & 0xff)
  } else {
    objectWriteUInt32(this, value, offset, false)
  }
  return offset + 4
}

function checkIEEE754 (buf, value, offset, ext, max, min) {
  if (value > max || value < min) throw new RangeError('value is out of bounds')
  if (offset + ext > buf.length) throw new RangeError('index out of range')
  if (offset < 0) throw new RangeError('index out of range')
}

function writeFloat (buf, value, offset, littleEndian, noAssert) {
  if (!noAssert) {
    checkIEEE754(buf, value, offset, 4, 3.4028234663852886e+38, -3.4028234663852886e+38)
  }
  ieee754.write(buf, value, offset, littleEndian, 23, 4)
  return offset + 4
}

Buffer.prototype.writeFloatLE = function writeFloatLE (value, offset, noAssert) {
  return writeFloat(this, value, offset, true, noAssert)
}

Buffer.prototype.writeFloatBE = function writeFloatBE (value, offset, noAssert) {
  return writeFloat(this, value, offset, false, noAssert)
}

function writeDouble (buf, value, offset, littleEndian, noAssert) {
  if (!noAssert) {
    checkIEEE754(buf, value, offset, 8, 1.7976931348623157E+308, -1.7976931348623157E+308)
  }
  ieee754.write(buf, value, offset, littleEndian, 52, 8)
  return offset + 8
}

Buffer.prototype.writeDoubleLE = function writeDoubleLE (value, offset, noAssert) {
  return writeDouble(this, value, offset, true, noAssert)
}

Buffer.prototype.writeDoubleBE = function writeDoubleBE (value, offset, noAssert) {
  return writeDouble(this, value, offset, false, noAssert)
}

// copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length)
Buffer.prototype.copy = function copy (target, targetStart, start, end) {
  if (!start) start = 0
  if (!end && end !== 0) end = this.length
  if (targetStart >= target.length) targetStart = target.length
  if (!targetStart) targetStart = 0
  if (end > 0 && end < start) end = start

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

  // Fatal error conditions
  if (targetStart < 0) {
    throw new RangeError('targetStart out of bounds')
  }
  if (start < 0 || start >= this.length) throw new RangeError('sourceStart out of bounds')
  if (end < 0) throw new RangeError('sourceEnd out of bounds')

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

  var len = end - start
  var i

  if (this === target && start < targetStart && targetStart < end) {
    // descending copy from end
    for (i = len - 1; i >= 0; i--) {
      target[i + targetStart] = this[i + start]
    }
  } else if (len < 1000 || !Buffer.TYPED_ARRAY_SUPPORT) {
    // ascending copy from start
    for (i = 0; i < len; i++) {
      target[i + targetStart] = this[i + start]
    }
  } else {
    Uint8Array.prototype.set.call(
      target,
      this.subarray(start, start + len),
      targetStart
    )
  }

  return len
}

// fill(value, start=0, end=buffer.length)
Buffer.prototype.fill = function fill (value, start, end) {
  if (!value) value = 0
  if (!start) start = 0
  if (!end) end = this.length

  if (end < start) throw new RangeError('end < start')

  // Fill 0 bytes; we're done
  if (end === start) return
  if (this.length === 0) return

  if (start < 0 || start >= this.length) throw new RangeError('start out of bounds')
  if (end < 0 || end > this.length) throw new RangeError('end out of bounds')

  var i
  if (typeof value === 'number') {
    for (i = start; i < end; i++) {
      this[i] = value
    }
  } else {
    var bytes = utf8ToBytes(value.toString())
    var len = bytes.length
    for (i = start; i < end; i++) {
      this[i] = bytes[i % len]
    }
  }

  return this
}

// HELPER FUNCTIONS
// ================

var INVALID_BASE64_RE = /[^+\/0-9A-Za-z-_]/g

function base64clean (str) {
  // Node strips out invalid characters like \n and \t from the string, base64-js does not
  str = stringtrim(str).replace(INVALID_BASE64_RE, '')
  // Node converts strings with length < 2 to ''
  if (str.length < 2) return ''
  // Node allows for non-padded base64 strings (missing trailing ===), base64-js does not
  while (str.length % 4 !== 0) {
    str = str + '='
  }
  return str
}

function stringtrim (str) {
  if (str.trim) return str.trim()
  return str.replace(/^\s+|\s+$/g, '')
}

function toHex (n) {
  if (n < 16) return '0' + n.toString(16)
  return n.toString(16)
}

function utf8ToBytes (string, units) {
  units = units || Infinity
  var codePoint
  var length = string.length
  var leadSurrogate = null
  var bytes = []

  for (var i = 0; i < length; i++) {
    codePoint = string.charCodeAt(i)

    // is surrogate component
    if (codePoint > 0xD7FF && codePoint < 0xE000) {
      // last char was a lead
      if (!leadSurrogate) {
        // no lead yet
        if (codePoint > 0xDBFF) {
          // unexpected trail
          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
          continue
        } else if (i + 1 === length) {
          // unpaired lead
          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
          continue
        }

        // valid lead
        leadSurrogate = codePoint

        continue
      }

      // 2 leads in a row
      if (codePoint < 0xDC00) {
        if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
        leadSurrogate = codePoint
        continue
      }

      // valid surrogate pair
      codePoint = (leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00) + 0x10000
    } else if (leadSurrogate) {
      // valid bmp char, but last char was a lead
      if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
    }

    leadSurrogate = null

    // encode utf8
    if (codePoint < 0x80) {
      if ((units -= 1) < 0) break
      bytes.push(codePoint)
    } else if (codePoint < 0x800) {
      if ((units -= 2) < 0) break
      bytes.push(
        codePoint >> 0x6 | 0xC0,
        codePoint & 0x3F | 0x80
      )
    } else if (codePoint < 0x10000) {
      if ((units -= 3) < 0) break
      bytes.push(
        codePoint >> 0xC | 0xE0,
        codePoint >> 0x6 & 0x3F | 0x80,
        codePoint & 0x3F | 0x80
      )
    } else if (codePoint < 0x110000) {
      if ((units -= 4) < 0) break
      bytes.push(
        codePoint >> 0x12 | 0xF0,
        codePoint >> 0xC & 0x3F | 0x80,
        codePoint >> 0x6 & 0x3F | 0x80,
        codePoint & 0x3F | 0x80
      )
    } else {
      throw new Error('Invalid code point')
    }
  }

  return bytes
}

function asciiToBytes (str) {
  var byteArray = []
  for (var i = 0; i < str.length; i++) {
    // Node's code seems to be doing this and not & 0x7F..
    byteArray.push(str.charCodeAt(i) & 0xFF)
  }
  return byteArray
}

function utf16leToBytes (str, units) {
  var c, hi, lo
  var byteArray = []
  for (var i = 0; i < str.length; i++) {
    if ((units -= 2) < 0) break

    c = str.charCodeAt(i)
    hi = c >> 8
    lo = c % 256
    byteArray.push(lo)
    byteArray.push(hi)
  }

  return byteArray
}

function base64ToBytes (str) {
  return base64.toByteArray(base64clean(str))
}

function blitBuffer (src, dst, offset, length) {
  for (var i = 0; i < length; i++) {
    if ((i + offset >= dst.length) || (i >= src.length)) break
    dst[i + offset] = src[i]
  }
  return i
}

}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"base64-js":18,"ieee754":21,"isarray":20}],20:[function(require,module,exports){
var toString = {}.toString;

module.exports = Array.isArray || function (arr) {
  return toString.call(arr) == '[object Array]';
};

},{}],21:[function(require,module,exports){
exports.read = function (buffer, offset, isLE, mLen, nBytes) {
  var e, m
  var eLen = nBytes * 8 - mLen - 1
  var eMax = (1 << eLen) - 1
  var eBias = eMax >> 1
  var nBits = -7
  var i = isLE ? (nBytes - 1) : 0
  var d = isLE ? -1 : 1
  var s = buffer[offset + i]

  i += d

  e = s & ((1 << (-nBits)) - 1)
  s >>= (-nBits)
  nBits += eLen
  for (; nBits > 0; e = e * 256 + buffer[offset + i], i += d, nBits -= 8) {}

  m = e & ((1 << (-nBits)) - 1)
  e >>= (-nBits)
  nBits += mLen
  for (; nBits > 0; m = m * 256 + buffer[offset + i], i += d, nBits -= 8) {}

  if (e === 0) {
    e = 1 - eBias
  } else if (e === eMax) {
    return m ? NaN : ((s ? -1 : 1) * Infinity)
  } else {
    m = m + Math.pow(2, mLen)
    e = e - eBias
  }
  return (s ? -1 : 1) * m * Math.pow(2, e - mLen)
}

exports.write = function (buffer, value, offset, isLE, mLen, nBytes) {
  var e, m, c
  var eLen = nBytes * 8 - mLen - 1
  var eMax = (1 << eLen) - 1
  var eBias = eMax >> 1
  var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0)
  var i = isLE ? 0 : (nBytes - 1)
  var d = isLE ? 1 : -1
  var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0

  value = Math.abs(value)

  if (isNaN(value) || value === Infinity) {
    m = isNaN(value) ? 1 : 0
    e = eMax
  } else {
    e = Math.floor(Math.log(value) / Math.LN2)
    if (value * (c = Math.pow(2, -e)) < 1) {
      e--
      c *= 2
    }
    if (e + eBias >= 1) {
      value += rt / c
    } else {
      value += rt * Math.pow(2, 1 - eBias)
    }
    if (value * c >= 2) {
      e++
      c /= 2
    }

    if (e + eBias >= eMax) {
      m = 0
      e = eMax
    } else if (e + eBias >= 1) {
      m = (value * c - 1) * Math.pow(2, mLen)
      e = e + eBias
    } else {
      m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen)
      e = 0
    }
  }

  for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}

  e = (e << mLen) | m
  eLen += mLen
  for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}

  buffer[offset + i - d] |= s * 128
}

},{}],22:[function(require,module,exports){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

'use strict';

// If obj.hasOwnProperty has been overridden, then calling
// obj.hasOwnProperty(prop) will break.
// See: https://github.com/joyent/node/issues/1707
function hasOwnProperty(obj, prop) {
  return Object.prototype.hasOwnProperty.call(obj, prop);
}

module.exports = function(qs, sep, eq, options) {
  sep = sep || '&';
  eq = eq || '=';
  var obj = {};

  if (typeof qs !== 'string' || qs.length === 0) {
    return obj;
  }

  var regexp = /\+/g;
  qs = qs.split(sep);

  var maxKeys = 1000;
  if (options && typeof options.maxKeys === 'number') {
    maxKeys = options.maxKeys;
  }

  var len = qs.length;
  // maxKeys <= 0 means that we should not limit keys count
  if (maxKeys > 0 && len > maxKeys) {
    len = maxKeys;
  }

  for (var i = 0; i < len; ++i) {
    var x = qs[i].replace(regexp, '%20'),
        idx = x.indexOf(eq),
        kstr, vstr, k, v;

    if (idx >= 0) {
      kstr = x.substr(0, idx);
      vstr = x.substr(idx + 1);
    } else {
      kstr = x;
      vstr = '';
    }

    k = decodeURIComponent(kstr);
    v = decodeURIComponent(vstr);

    if (!hasOwnProperty(obj, k)) {
      obj[k] = v;
    } else if (isArray(obj[k])) {
      obj[k].push(v);
    } else {
      obj[k] = [obj[k], v];
    }
  }

  return obj;
};

var isArray = Array.isArray || function (xs) {
  return Object.prototype.toString.call(xs) === '[object Array]';
};

},{}],23:[function(require,module,exports){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

'use strict';

var stringifyPrimitive = function(v) {
  switch (typeof v) {
    case 'string':
      return v;

    case 'boolean':
      return v ? 'true' : 'false';

    case 'number':
      return isFinite(v) ? v : '';

    default:
      return '';
  }
};

module.exports = function(obj, sep, eq, name) {
  sep = sep || '&';
  eq = eq || '=';
  if (obj === null) {
    obj = undefined;
  }

  if (typeof obj === 'object') {
    return map(objectKeys(obj), function(k) {
      var ks = encodeURIComponent(stringifyPrimitive(k)) + eq;
      if (isArray(obj[k])) {
        return map(obj[k], function(v) {
          return ks + encodeURIComponent(stringifyPrimitive(v));
        }).join(sep);
      } else {
        return ks + encodeURIComponent(stringifyPrimitive(obj[k]));
      }
    }).join(sep);

  }

  if (!name) return '';
  return encodeURIComponent(stringifyPrimitive(name)) + eq +
         encodeURIComponent(stringifyPrimitive(obj));
};

var isArray = Array.isArray || function (xs) {
  return Object.prototype.toString.call(xs) === '[object Array]';
};

function map (xs, f) {
  if (xs.map) return xs.map(f);
  var res = [];
  for (var i = 0; i < xs.length; i++) {
    res.push(f(xs[i], i));
  }
  return res;
}

var objectKeys = Object.keys || function (obj) {
  var res = [];
  for (var key in obj) {
    if (Object.prototype.hasOwnProperty.call(obj, key)) res.push(key);
  }
  return res;
};

},{}],24:[function(require,module,exports){
'use strict';

exports.decode = exports.parse = require('./decode');
exports.encode = exports.stringify = require('./encode');

},{"./decode":22,"./encode":23}]},{},[1])(1)
});