update

node_modules/engine.io-client/lib/transports/index.js

@@ -0,0 +1,53 @@
+/**
+ * Module dependencies
+ */
+
+var XMLHttpRequest = require('xmlhttprequest-ssl');
+var XHR = require('./polling-xhr');
+var JSONP = require('./polling-jsonp');
+var websocket = require('./websocket');
+
+/**
+ * Export transports.
+ */
+
+exports.polling = polling;
+exports.websocket = websocket;
+
+/**
+ * Polling transport polymorphic constructor.
+ * Decides on xhr vs jsonp based on feature detection.
+ *
+ * @api private
+ */
+
+function polling (opts) {
+  var xhr;
+  var xd = false;
+  var xs = false;
+  var jsonp = false !== opts.jsonp;
+
+  if (typeof location !== 'undefined') {
+    var isSSL = 'https:' === location.protocol;
+    var port = location.port;
+
+    // some user agents have empty `location.port`
+    if (!port) {
+      port = isSSL ? 443 : 80;
+    }
+
+    xd = opts.hostname !== location.hostname || port !== opts.port;
+    xs = opts.secure !== isSSL;
+  }
+
+  opts.xdomain = xd;
+  opts.xscheme = xs;
+  xhr = new XMLHttpRequest(opts);
+
+  if ('open' in xhr && !opts.forceJSONP) {
+    return new XHR(opts);
+  } else {
+    if (!jsonp) throw new Error('JSONP disabled');
+    return new JSONP(opts);
+  }
+}

node_modules/engine.io-client/lib/transports/polling-jsonp.js

@@ -0,0 +1,239 @@
+/**
+ * Module requirements.
+ */
+
+var Polling = require('./polling');
+var inherit = require('component-inherit');
+
+/**
+ * Module exports.
+ */
+
+module.exports = JSONPPolling;
+
+/**
+ * Cached regular expressions.
+ */
+
+var rNewline = /\n/g;
+var rEscapedNewline = /\\n/g;
+
+/**
+ * Global JSONP callbacks.
+ */
+
+var callbacks;
+
+/**
+ * Noop.
+ */
+
+function empty () { }
+
+/**
+ * Until https://github.com/tc39/proposal-global is shipped.
+ */
+function glob () {
+  return typeof self !== 'undefined' ? self
+      : typeof window !== 'undefined' ? window
+      : typeof global !== 'undefined' ? global : {};
+}
+
+/**
+ * JSONP Polling constructor.
+ *
+ * @param {Object} opts.
+ * @api public
+ */
+
+function JSONPPolling (opts) {
+  Polling.call(this, opts);
+
+  this.query = this.query || {};
+
+  // define global callbacks array if not present
+  // we do this here (lazily) to avoid unneeded global pollution
+  if (!callbacks) {
+    // we need to consider multiple engines in the same page
+    var global = glob();
+    callbacks = global.___eio = (global.___eio || []);
+  }
+
+  // callback identifier
+  this.index = callbacks.length;
+
+  // add callback to jsonp global
+  var self = this;
+  callbacks.push(function (msg) {
+    self.onData(msg);
+  });
+
+  // append to query string
+  this.query.j = this.index;
+
+  // prevent spurious errors from being emitted when the window is unloaded
+  if (typeof addEventListener === 'function') {
+    addEventListener('beforeunload', function () {
+      if (self.script) self.script.onerror = empty;
+    }, false);
+  }
+}
+
+/**
+ * Inherits from Polling.
+ */
+
+inherit(JSONPPolling, Polling);
+
+/*
+ * JSONP only supports binary as base64 encoded strings
+ */
+
+JSONPPolling.prototype.supportsBinary = false;
+
+/**
+ * Closes the socket.
+ *
+ * @api private
+ */
+
+JSONPPolling.prototype.doClose = function () {
+  if (this.script) {
+    this.script.parentNode.removeChild(this.script);
+    this.script = null;
+  }
+
+  if (this.form) {
+    this.form.parentNode.removeChild(this.form);
+    this.form = null;
+    this.iframe = null;
+  }
+
+  Polling.prototype.doClose.call(this);
+};
+
+/**
+ * Starts a poll cycle.
+ *
+ * @api private
+ */
+
+JSONPPolling.prototype.doPoll = function () {
+  var self = this;
+  var script = document.createElement('script');
+
+  if (this.script) {
+    this.script.parentNode.removeChild(this.script);
+    this.script = null;
+  }
+
+  script.async = true;
+  script.src = this.uri();
+  script.onerror = function (e) {
+    self.onError('jsonp poll error', e);
+  };
+
+  var insertAt = document.getElementsByTagName('script')[0];
+  if (insertAt) {
+    insertAt.parentNode.insertBefore(script, insertAt);
+  } else {
+    (document.head || document.body).appendChild(script);
+  }
+  this.script = script;
+
+  var isUAgecko = 'undefined' !== typeof navigator && /gecko/i.test(navigator.userAgent);
+
+  if (isUAgecko) {
+    setTimeout(function () {
+      var iframe = document.createElement('iframe');
+      document.body.appendChild(iframe);
+      document.body.removeChild(iframe);
+    }, 100);
+  }
+};
+
+/**
+ * Writes with a hidden iframe.
+ *
+ * @param {String} data to send
+ * @param {Function} called upon flush.
+ * @api private
+ */
+
+JSONPPolling.prototype.doWrite = function (data, fn) {
+  var self = this;
+
+  if (!this.form) {
+    var form = document.createElement('form');
+    var area = document.createElement('textarea');
+    var id = this.iframeId = 'eio_iframe_' + this.index;
+    var iframe;
+
+    form.className = 'socketio';
+    form.style.position = 'absolute';
+    form.style.top = '-1000px';
+    form.style.left = '-1000px';
+    form.target = id;
+    form.method = 'POST';
+    form.setAttribute('accept-charset', 'utf-8');
+    area.name = 'd';
+    form.appendChild(area);
+    document.body.appendChild(form);
+
+    this.form = form;
+    this.area = area;
+  }
+
+  this.form.action = this.uri();
+
+  function complete () {
+    initIframe();
+    fn();
+  }
+
+  function initIframe () {
+    if (self.iframe) {
+      try {
+        self.form.removeChild(self.iframe);
+      } catch (e) {
+        self.onError('jsonp polling iframe removal error', e);
+      }
+    }
+
+    try {
+      // ie6 dynamic iframes with target="" support (thanks Chris Lambacher)
+      var html = '<iframe src="javascript:0" name="' + self.iframeId + '">';
+      iframe = document.createElement(html);
+    } catch (e) {
+      iframe = document.createElement('iframe');
+      iframe.name = self.iframeId;
+      iframe.src = 'javascript:0';
+    }
+
+    iframe.id = self.iframeId;
+
+    self.form.appendChild(iframe);
+    self.iframe = iframe;
+  }
+
+  initIframe();
+
+  // escape \n to prevent it from being converted into \r\n by some UAs
+  // double escaping is required for escaped new lines because unescaping of new lines can be done safely on server-side
+  data = data.replace(rEscapedNewline, '\\\n');
+  this.area.value = data.replace(rNewline, '\\n');
+
+  try {
+    this.form.submit();
+  } catch (e) {}
+
+  if (this.iframe.attachEvent) {
+    this.iframe.onreadystatechange = function () {
+      if (self.iframe.readyState === 'complete') {
+        complete();
+      }
+    };
+  } else {
+    this.iframe.onload = complete;
+  }
+};

node_modules/engine.io-client/lib/transports/polling-xhr.js

@@ -0,0 +1,417 @@
+/* global attachEvent */
+
+/**
+ * Module requirements.
+ */
+
+var XMLHttpRequest = require('xmlhttprequest-ssl');
+var Polling = require('./polling');
+var Emitter = require('component-emitter');
+var inherit = require('component-inherit');
+var debug = require('debug')('engine.io-client:polling-xhr');
+
+/**
+ * Module exports.
+ */
+
+module.exports = XHR;
+module.exports.Request = Request;
+
+/**
+ * Empty function
+ */
+
+function empty () {}
+
+/**
+ * XHR Polling constructor.
+ *
+ * @param {Object} opts
+ * @api public
+ */
+
+function XHR (opts) {
+  Polling.call(this, opts);
+  this.requestTimeout = opts.requestTimeout;
+  this.extraHeaders = opts.extraHeaders;
+
+  if (typeof location !== 'undefined') {
+    var isSSL = 'https:' === location.protocol;
+    var port = location.port;
+
+    // some user agents have empty `location.port`
+    if (!port) {
+      port = isSSL ? 443 : 80;
+    }
+
+    this.xd = (typeof location !== 'undefined' && opts.hostname !== location.hostname) ||
+      port !== opts.port;
+    this.xs = opts.secure !== isSSL;
+  }
+}
+
+/**
+ * Inherits from Polling.
+ */
+
+inherit(XHR, Polling);
+
+/**
+ * XHR supports binary
+ */
+
+XHR.prototype.supportsBinary = true;
+
+/**
+ * Creates a request.
+ *
+ * @param {String} method
+ * @api private
+ */
+
+XHR.prototype.request = function (opts) {
+  opts = opts || {};
+  opts.uri = this.uri();
+  opts.xd = this.xd;
+  opts.xs = this.xs;
+  opts.agent = this.agent || false;
+  opts.supportsBinary = this.supportsBinary;
+  opts.enablesXDR = this.enablesXDR;
+  opts.withCredentials = this.withCredentials;
+
+  // SSL options for Node.js client
+  opts.pfx = this.pfx;
+  opts.key = this.key;
+  opts.passphrase = this.passphrase;
+  opts.cert = this.cert;
+  opts.ca = this.ca;
+  opts.ciphers = this.ciphers;
+  opts.rejectUnauthorized = this.rejectUnauthorized;
+  opts.requestTimeout = this.requestTimeout;
+
+  // other options for Node.js client
+  opts.extraHeaders = this.extraHeaders;
+
+  return new Request(opts);
+};
+
+/**
+ * Sends data.
+ *
+ * @param {String} data to send.
+ * @param {Function} called upon flush.
+ * @api private
+ */
+
+XHR.prototype.doWrite = function (data, fn) {
+  var isBinary = typeof data !== 'string' && data !== undefined;
+  var req = this.request({ method: 'POST', data: data, isBinary: isBinary });
+  var self = this;
+  req.on('success', fn);
+  req.on('error', function (err) {
+    self.onError('xhr post error', err);
+  });
+  this.sendXhr = req;
+};
+
+/**
+ * Starts a poll cycle.
+ *
+ * @api private
+ */
+
+XHR.prototype.doPoll = function () {
+  debug('xhr poll');
+  var req = this.request();
+  var self = this;
+  req.on('data', function (data) {
+    self.onData(data);
+  });
+  req.on('error', function (err) {
+    self.onError('xhr poll error', err);
+  });
+  this.pollXhr = req;
+};
+
+/**
+ * Request constructor
+ *
+ * @param {Object} options
+ * @api public
+ */
+
+function Request (opts) {
+  this.method = opts.method || 'GET';
+  this.uri = opts.uri;
+  this.xd = !!opts.xd;
+  this.xs = !!opts.xs;
+  this.async = false !== opts.async;
+  this.data = undefined !== opts.data ? opts.data : null;
+  this.agent = opts.agent;
+  this.isBinary = opts.isBinary;
+  this.supportsBinary = opts.supportsBinary;
+  this.enablesXDR = opts.enablesXDR;
+  this.withCredentials = opts.withCredentials;
+  this.requestTimeout = opts.requestTimeout;
+
+  // SSL options for Node.js client
+  this.pfx = opts.pfx;
+  this.key = opts.key;
+  this.passphrase = opts.passphrase;
+  this.cert = opts.cert;
+  this.ca = opts.ca;
+  this.ciphers = opts.ciphers;
+  this.rejectUnauthorized = opts.rejectUnauthorized;
+
+  // other options for Node.js client
+  this.extraHeaders = opts.extraHeaders;
+
+  this.create();
+}
+
+/**
+ * Mix in `Emitter`.
+ */
+
+Emitter(Request.prototype);
+
+/**
+ * Creates the XHR object and sends the request.
+ *
+ * @api private
+ */
+
+Request.prototype.create = function () {
+  var opts = { agent: this.agent, xdomain: this.xd, xscheme: this.xs, enablesXDR: this.enablesXDR };
+
+  // SSL options for Node.js client
+  opts.pfx = this.pfx;
+  opts.key = this.key;
+  opts.passphrase = this.passphrase;
+  opts.cert = this.cert;
+  opts.ca = this.ca;
+  opts.ciphers = this.ciphers;
+  opts.rejectUnauthorized = this.rejectUnauthorized;
+
+  var xhr = this.xhr = new XMLHttpRequest(opts);
+  var self = this;
+
+  try {
+    debug('xhr open %s: %s', this.method, this.uri);
+    xhr.open(this.method, this.uri, this.async);
+    try {
+      if (this.extraHeaders) {
+        xhr.setDisableHeaderCheck && xhr.setDisableHeaderCheck(true);
+        for (var i in this.extraHeaders) {
+          if (this.extraHeaders.hasOwnProperty(i)) {
+            xhr.setRequestHeader(i, this.extraHeaders[i]);
+          }
+        }
+      }
+    } catch (e) {}
+
+    if ('POST' === this.method) {
+      try {
+        if (this.isBinary) {
+          xhr.setRequestHeader('Content-type', 'application/octet-stream');
+        } else {
+          xhr.setRequestHeader('Content-type', 'text/plain;charset=UTF-8');
+        }
+      } catch (e) {}
+    }
+
+    try {
+      xhr.setRequestHeader('Accept', '*/*');
+    } catch (e) {}
+
+    // ie6 check
+    if ('withCredentials' in xhr) {
+      xhr.withCredentials = this.withCredentials;
+    }
+
+    if (this.requestTimeout) {
+      xhr.timeout = this.requestTimeout;
+    }
+
+    if (this.hasXDR()) {
+      xhr.onload = function () {
+        self.onLoad();
+      };
+      xhr.onerror = function () {
+        self.onError(xhr.responseText);
+      };
+    } else {
+      xhr.onreadystatechange = function () {
+        if (xhr.readyState === 2) {
+          try {
+            var contentType = xhr.getResponseHeader('Content-Type');
+            if (self.supportsBinary && contentType === 'application/octet-stream' || contentType === 'application/octet-stream; charset=UTF-8') {
+              xhr.responseType = 'arraybuffer';
+            }
+          } catch (e) {}
+        }
+        if (4 !== xhr.readyState) return;
+        if (200 === xhr.status || 1223 === xhr.status) {
+          self.onLoad();
+        } else {
+          // make sure the `error` event handler that's user-set
+          // does not throw in the same tick and gets caught here
+          setTimeout(function () {
+            self.onError(typeof xhr.status === 'number' ? xhr.status : 0);
+          }, 0);
+        }
+      };
+    }
+
+    debug('xhr data %s', this.data);
+    xhr.send(this.data);
+  } catch (e) {
+    // Need to defer since .create() is called directly fhrom the constructor
+    // and thus the 'error' event can only be only bound *after* this exception
+    // occurs.  Therefore, also, we cannot throw here at all.
+    setTimeout(function () {
+      self.onError(e);
+    }, 0);
+    return;
+  }
+
+  if (typeof document !== 'undefined') {
+    this.index = Request.requestsCount++;
+    Request.requests[this.index] = this;
+  }
+};
+
+/**
+ * Called upon successful response.
+ *
+ * @api private
+ */
+
+Request.prototype.onSuccess = function () {
+  this.emit('success');
+  this.cleanup();
+};
+
+/**
+ * Called if we have data.
+ *
+ * @api private
+ */
+
+Request.prototype.onData = function (data) {
+  this.emit('data', data);
+  this.onSuccess();
+};
+
+/**
+ * Called upon error.
+ *
+ * @api private
+ */
+
+Request.prototype.onError = function (err) {
+  this.emit('error', err);
+  this.cleanup(true);
+};
+
+/**
+ * Cleans up house.
+ *
+ * @api private
+ */
+
+Request.prototype.cleanup = function (fromError) {
+  if ('undefined' === typeof this.xhr || null === this.xhr) {
+    return;
+  }
+  // xmlhttprequest
+  if (this.hasXDR()) {
+    this.xhr.onload = this.xhr.onerror = empty;
+  } else {
+    this.xhr.onreadystatechange = empty;
+  }
+
+  if (fromError) {
+    try {
+      this.xhr.abort();
+    } catch (e) {}
+  }
+
+  if (typeof document !== 'undefined') {
+    delete Request.requests[this.index];
+  }
+
+  this.xhr = null;
+};
+
+/**
+ * Called upon load.
+ *
+ * @api private
+ */
+
+Request.prototype.onLoad = function () {
+  var data;
+  try {
+    var contentType;
+    try {
+      contentType = this.xhr.getResponseHeader('Content-Type');
+    } catch (e) {}
+    if (contentType === 'application/octet-stream' || contentType === 'application/octet-stream; charset=UTF-8') {
+      data = this.xhr.response || this.xhr.responseText;
+    } else {
+      data = this.xhr.responseText;
+    }
+  } catch (e) {
+    this.onError(e);
+  }
+  if (null != data) {
+    this.onData(data);
+  }
+};
+
+/**
+ * Check if it has XDomainRequest.
+ *
+ * @api private
+ */
+
+Request.prototype.hasXDR = function () {
+  return typeof XDomainRequest !== 'undefined' && !this.xs && this.enablesXDR;
+};
+
+/**
+ * Aborts the request.
+ *
+ * @api public
+ */
+
+Request.prototype.abort = function () {
+  this.cleanup();
+};
+
+/**
+ * Aborts pending requests when unloading the window. This is needed to prevent
+ * memory leaks (e.g. when using IE) and to ensure that no spurious error is
+ * emitted.
+ */
+
+Request.requestsCount = 0;
+Request.requests = {};
+
+if (typeof document !== 'undefined') {
+  if (typeof attachEvent === 'function') {
+    attachEvent('onunload', unloadHandler);
+  } else if (typeof addEventListener === 'function') {
+    var terminationEvent = 'onpagehide' in self ? 'pagehide' : 'unload';
+    addEventListener(terminationEvent, unloadHandler, false);
+  }
+}
+
+function unloadHandler () {
+  for (var i in Request.requests) {
+    if (Request.requests.hasOwnProperty(i)) {
+      Request.requests[i].abort();
+    }
+  }
+}

node_modules/engine.io-client/lib/transports/polling.js

@@ -0,0 +1,245 @@
+/**
+ * Module dependencies.
+ */
+
+var Transport = require('../transport');
+var parseqs = require('parseqs');
+var parser = require('engine.io-parser');
+var inherit = require('component-inherit');
+var yeast = require('yeast');
+var debug = require('debug')('engine.io-client:polling');
+
+/**
+ * Module exports.
+ */
+
+module.exports = Polling;
+
+/**
+ * Is XHR2 supported?
+ */
+
+var hasXHR2 = (function () {
+  var XMLHttpRequest = require('xmlhttprequest-ssl');
+  var xhr = new XMLHttpRequest({ xdomain: false });
+  return null != xhr.responseType;
+})();
+
+/**
+ * Polling interface.
+ *
+ * @param {Object} opts
+ * @api private
+ */
+
+function Polling (opts) {
+  var forceBase64 = (opts && opts.forceBase64);
+  if (!hasXHR2 || forceBase64) {
+    this.supportsBinary = false;
+  }
+  Transport.call(this, opts);
+}
+
+/**
+ * Inherits from Transport.
+ */
+
+inherit(Polling, Transport);
+
+/**
+ * Transport name.
+ */
+
+Polling.prototype.name = 'polling';
+
+/**
+ * Opens the socket (triggers polling). We write a PING message to determine
+ * when the transport is open.
+ *
+ * @api private
+ */
+
+Polling.prototype.doOpen = function () {
+  this.poll();
+};
+
+/**
+ * Pauses polling.
+ *
+ * @param {Function} callback upon buffers are flushed and transport is paused
+ * @api private
+ */
+
+Polling.prototype.pause = function (onPause) {
+  var self = this;
+
+  this.readyState = 'pausing';
+
+  function pause () {
+    debug('paused');
+    self.readyState = 'paused';
+    onPause();
+  }
+
+  if (this.polling || !this.writable) {
+    var total = 0;
+
+    if (this.polling) {
+      debug('we are currently polling - waiting to pause');
+      total++;
+      this.once('pollComplete', function () {
+        debug('pre-pause polling complete');
+        --total || pause();
+      });
+    }
+
+    if (!this.writable) {
+      debug('we are currently writing - waiting to pause');
+      total++;
+      this.once('drain', function () {
+        debug('pre-pause writing complete');
+        --total || pause();
+      });
+    }
+  } else {
+    pause();
+  }
+};
+
+/**
+ * Starts polling cycle.
+ *
+ * @api public
+ */
+
+Polling.prototype.poll = function () {
+  debug('polling');
+  this.polling = true;
+  this.doPoll();
+  this.emit('poll');
+};
+
+/**
+ * Overloads onData to detect payloads.
+ *
+ * @api private
+ */
+
+Polling.prototype.onData = function (data) {
+  var self = this;
+  debug('polling got data %s', data);
+  var callback = function (packet, index, total) {
+    // if its the first message we consider the transport open
+    if ('opening' === self.readyState) {
+      self.onOpen();
+    }
+
+    // if its a close packet, we close the ongoing requests
+    if ('close' === packet.type) {
+      self.onClose();
+      return false;
+    }
+
+    // otherwise bypass onData and handle the message
+    self.onPacket(packet);
+  };
+
+  // decode payload
+  parser.decodePayload(data, this.socket.binaryType, callback);
+
+  // if an event did not trigger closing
+  if ('closed' !== this.readyState) {
+    // if we got data we're not polling
+    this.polling = false;
+    this.emit('pollComplete');
+
+    if ('open' === this.readyState) {
+      this.poll();
+    } else {
+      debug('ignoring poll - transport state "%s"', this.readyState);
+    }
+  }
+};
+
+/**
+ * For polling, send a close packet.
+ *
+ * @api private
+ */
+
+Polling.prototype.doClose = function () {
+  var self = this;
+
+  function close () {
+    debug('writing close packet');
+    self.write([{ type: 'close' }]);
+  }
+
+  if ('open' === this.readyState) {
+    debug('transport open - closing');
+    close();
+  } else {
+    // in case we're trying to close while
+    // handshaking is in progress (GH-164)
+    debug('transport not open - deferring close');
+    this.once('open', close);
+  }
+};
+
+/**
+ * Writes a packets payload.
+ *
+ * @param {Array} data packets
+ * @param {Function} drain callback
+ * @api private
+ */
+
+Polling.prototype.write = function (packets) {
+  var self = this;
+  this.writable = false;
+  var callbackfn = function () {
+    self.writable = true;
+    self.emit('drain');
+  };
+
+  parser.encodePayload(packets, this.supportsBinary, function (data) {
+    self.doWrite(data, callbackfn);
+  });
+};
+
+/**
+ * Generates uri for connection.
+ *
+ * @api private
+ */
+
+Polling.prototype.uri = function () {
+  var query = this.query || {};
+  var schema = this.secure ? 'https' : 'http';
+  var port = '';
+
+  // cache busting is forced
+  if (false !== this.timestampRequests) {
+    query[this.timestampParam] = yeast();
+  }
+
+  if (!this.supportsBinary && !query.sid) {
+    query.b64 = 1;
+  }
+
+  query = parseqs.encode(query);
+
+  // avoid port if default for schema
+  if (this.port && (('https' === schema && Number(this.port) !== 443) ||
+     ('http' === schema && Number(this.port) !== 80))) {
+    port = ':' + this.port;
+  }
+
+  // prepend ? to query
+  if (query.length) {
+    query = '?' + query;
+  }
+
+  var ipv6 = this.hostname.indexOf(':') !== -1;
+  return schema + '://' + (ipv6 ? '[' + this.hostname + ']' : this.hostname) + port + this.path + query;
+};

node_modules/engine.io-client/lib/transports/websocket.js

@@ -0,0 +1,295 @@
+/**
+ * Module dependencies.
+ */
+
+var Transport = require('../transport');
+var parser = require('engine.io-parser');
+var parseqs = require('parseqs');
+var inherit = require('component-inherit');
+var yeast = require('yeast');
+var debug = require('debug')('engine.io-client:websocket');
+
+var BrowserWebSocket, NodeWebSocket;
+
+if (typeof WebSocket !== 'undefined') {
+  BrowserWebSocket = WebSocket;
+} else if (typeof self !== 'undefined') {
+  BrowserWebSocket = self.WebSocket || self.MozWebSocket;
+}
+
+if (typeof window === 'undefined') {
+  try {
+    NodeWebSocket = require('ws');
+  } catch (e) { }
+}
+
+/**
+ * Get either the `WebSocket` or `MozWebSocket` globals
+ * in the browser or try to resolve WebSocket-compatible
+ * interface exposed by `ws` for Node-like environment.
+ */
+
+var WebSocketImpl = BrowserWebSocket || NodeWebSocket;
+
+/**
+ * Module exports.
+ */
+
+module.exports = WS;
+
+/**
+ * WebSocket transport constructor.
+ *
+ * @api {Object} connection options
+ * @api public
+ */
+
+function WS (opts) {
+  var forceBase64 = (opts && opts.forceBase64);
+  if (forceBase64) {
+    this.supportsBinary = false;
+  }
+  this.perMessageDeflate = opts.perMessageDeflate;
+  this.usingBrowserWebSocket = BrowserWebSocket && !opts.forceNode;
+  this.protocols = opts.protocols;
+  if (!this.usingBrowserWebSocket) {
+    WebSocketImpl = NodeWebSocket;
+  }
+  Transport.call(this, opts);
+}
+
+/**
+ * Inherits from Transport.
+ */
+
+inherit(WS, Transport);
+
+/**
+ * Transport name.
+ *
+ * @api public
+ */
+
+WS.prototype.name = 'websocket';
+
+/*
+ * WebSockets support binary
+ */
+
+WS.prototype.supportsBinary = true;
+
+/**
+ * Opens socket.
+ *
+ * @api private
+ */
+
+WS.prototype.doOpen = function () {
+  if (!this.check()) {
+    // let probe timeout
+    return;
+  }
+
+  var uri = this.uri();
+  var protocols = this.protocols;
+  var opts = {
+    agent: this.agent,
+    perMessageDeflate: this.perMessageDeflate
+  };
+
+  // SSL options for Node.js client
+  opts.pfx = this.pfx;
+  opts.key = this.key;
+  opts.passphrase = this.passphrase;
+  opts.cert = this.cert;
+  opts.ca = this.ca;
+  opts.ciphers = this.ciphers;
+  opts.rejectUnauthorized = this.rejectUnauthorized;
+  if (this.extraHeaders) {
+    opts.headers = this.extraHeaders;
+  }
+  if (this.localAddress) {
+    opts.localAddress = this.localAddress;
+  }
+
+  try {
+    this.ws =
+      this.usingBrowserWebSocket && !this.isReactNative
+        ? protocols
+          ? new WebSocketImpl(uri, protocols)
+          : new WebSocketImpl(uri)
+        : new WebSocketImpl(uri, protocols, opts);
+  } catch (err) {
+    return this.emit('error', err);
+  }
+
+  if (this.ws.binaryType === undefined) {
+    this.supportsBinary = false;
+  }
+
+  if (this.ws.supports && this.ws.supports.binary) {
+    this.supportsBinary = true;
+    this.ws.binaryType = 'nodebuffer';
+  } else {
+    this.ws.binaryType = 'arraybuffer';
+  }
+
+  this.addEventListeners();
+};
+
+/**
+ * Adds event listeners to the socket
+ *
+ * @api private
+ */
+
+WS.prototype.addEventListeners = function () {
+  var self = this;
+
+  this.ws.onopen = function () {
+    self.onOpen();
+  };
+  this.ws.onclose = function () {
+    self.onClose();
+  };
+  this.ws.onmessage = function (ev) {
+    self.onData(ev.data);
+  };
+  this.ws.onerror = function (e) {
+    self.onError('websocket error', e);
+  };
+};
+
+/**
+ * Writes data to socket.
+ *
+ * @param {Array} array of packets.
+ * @api private
+ */
+
+WS.prototype.write = function (packets) {
+  var self = this;
+  this.writable = false;
+
+  // encodePacket efficient as it uses WS framing
+  // no need for encodePayload
+  var total = packets.length;
+  for (var i = 0, l = total; i < l; i++) {
+    (function (packet) {
+      parser.encodePacket(packet, self.supportsBinary, function (data) {
+        if (!self.usingBrowserWebSocket) {
+          // always create a new object (GH-437)
+          var opts = {};
+          if (packet.options) {
+            opts.compress = packet.options.compress;
+          }
+
+          if (self.perMessageDeflate) {
+            var len = 'string' === typeof data ? Buffer.byteLength(data) : data.length;
+            if (len < self.perMessageDeflate.threshold) {
+              opts.compress = false;
+            }
+          }
+        }
+
+        // Sometimes the websocket has already been closed but the browser didn't
+        // have a chance of informing us about it yet, in that case send will
+        // throw an error
+        try {
+          if (self.usingBrowserWebSocket) {
+            // TypeError is thrown when passing the second argument on Safari
+            self.ws.send(data);
+          } else {
+            self.ws.send(data, opts);
+          }
+        } catch (e) {
+          debug('websocket closed before onclose event');
+        }
+
+        --total || done();
+      });
+    })(packets[i]);
+  }
+
+  function done () {
+    self.emit('flush');
+
+    // fake drain
+    // defer to next tick to allow Socket to clear writeBuffer
+    setTimeout(function () {
+      self.writable = true;
+      self.emit('drain');
+    }, 0);
+  }
+};
+
+/**
+ * Called upon close
+ *
+ * @api private
+ */
+
+WS.prototype.onClose = function () {
+  Transport.prototype.onClose.call(this);
+};
+
+/**
+ * Closes socket.
+ *
+ * @api private
+ */
+
+WS.prototype.doClose = function () {
+  if (typeof this.ws !== 'undefined') {
+    this.ws.close();
+  }
+};
+
+/**
+ * Generates uri for connection.
+ *
+ * @api private
+ */
+
+WS.prototype.uri = function () {
+  var query = this.query || {};
+  var schema = this.secure ? 'wss' : 'ws';
+  var port = '';
+
+  // avoid port if default for schema
+  if (this.port && (('wss' === schema && Number(this.port) !== 443) ||
+    ('ws' === schema && Number(this.port) !== 80))) {
+    port = ':' + this.port;
+  }
+
+  // append timestamp to URI
+  if (this.timestampRequests) {
+    query[this.timestampParam] = yeast();
+  }
+
+  // communicate binary support capabilities
+  if (!this.supportsBinary) {
+    query.b64 = 1;
+  }
+
+  query = parseqs.encode(query);
+
+  // prepend ? to query
+  if (query.length) {
+    query = '?' + query;
+  }
+
+  var ipv6 = this.hostname.indexOf(':') !== -1;
+  return schema + '://' + (ipv6 ? '[' + this.hostname + ']' : this.hostname) + port + this.path + query;
+};
+
+/**
+ * Feature detection for WebSocket.
+ *
+ * @return {Boolean} whether this transport is available.
+ * @api public
+ */
+
+WS.prototype.check = function () {
+  return !!WebSocketImpl && !('__initialize' in WebSocketImpl && this.name === WS.prototype.name);
+};