1 files changed, 712 insertions, 0 deletions
diff --git a/node_modules/ws/lib/WebSocket.js b/node_modules/ws/lib/WebSocket.js
new file mode 100644
index 0000000..41868d8
--- /dev/null
+++ b/node_modules/ws/lib/WebSocket.js
@@ -0,0 +1,712 @@
+/*!
+ * ws: a node.js websocket client
+ * Copyright(c) 2011 Einar Otto Stangvik <einaros@gmail.com>
+ * MIT Licensed
+ */
+
+'use strict';
+
+const EventEmitter = require('events');
+const crypto = require('crypto');
+const Ultron = require('ultron');
+const https = require('https');
+const http = require('http');
+const url = require('url');
+
+const PerMessageDeflate = require('./PerMessageDeflate');
+const EventTarget = require('./EventTarget');
+const Extensions = require('./Extensions');
+const constants = require('./Constants');
+const Receiver = require('./Receiver');
+const Sender = require('./Sender');
+
+const protocolVersions = [8, 13];
+const closeTimeout = 30 * 1000; // Allow 30 seconds to terminate the connection cleanly.
+
+/**
+ * Class representing a WebSocket.
+ *
+ * @extends EventEmitter
+ */
+class WebSocket extends EventEmitter {
+  /**
+   * Create a new `WebSocket`.
+   *
+   * @param {String} address The URL to which to connect
+   * @param {(String|String[])} protocols The subprotocols
+   * @param {Object} options Connection options
+   */
+  constructor (address, protocols, options) {
+    super();
+
+    if (!protocols) {
+      protocols = [];
+    } else if (typeof protocols === 'string') {
+      protocols = [protocols];
+    } else if (!Array.isArray(protocols)) {
+      options = protocols;
+      protocols = [];
+    }
+
+    this.readyState = WebSocket.CONNECTING;
+    this.bytesReceived = 0;
+    this.extensions = {};
+    this.protocol = '';
+
+    this._binaryType = constants.BINARY_TYPES[0];
+    this._finalize = this.finalize.bind(this);
+    this._finalizeCalled = false;
+    this._closeMessage = null;
+    this._closeTimer = null;
+    this._closeCode = null;
+    this._receiver = null;
+    this._sender = null;
+    this._socket = null;
+    this._ultron = null;
+
+    if (Array.isArray(address)) {
+      initAsServerClient.call(this, address[0], address[1], address[2], options);
+    } else {
+      initAsClient.call(this, address, protocols, options);
+    }
+  }
+
+  get CONNECTING () { return WebSocket.CONNECTING; }
+  get CLOSING () { return WebSocket.CLOSING; }
+  get CLOSED () { return WebSocket.CLOSED; }
+  get OPEN () { return WebSocket.OPEN; }
+
+  /**
+   * @type {Number}
+   */
+  get bufferedAmount () {
+    var amount = 0;
+
+    if (this._socket) {
+      amount = this._socket.bufferSize + this._sender.bufferedBytes;
+    }
+    return amount;
+  }
+
+  /**
+   * This deviates from the WHATWG interface since ws doesn't support the required
+   * default "blob" type (instead we define a custom "nodebuffer" type).
+   *
+   * @type {String}
+   */
+  get binaryType () {
+    return this._binaryType;
+  }
+
+  set binaryType (type) {
+    if (constants.BINARY_TYPES.indexOf(type) < 0) return;
+
+    this._binaryType = type;
+
+    //
+    // Allow to change `binaryType` on the fly.
+    //
+    if (this._receiver) this._receiver.binaryType = type;
+  }
+
+  /**
+   * Set up the socket and the internal resources.
+   *
+   * @param {net.Socket} socket The network socket between the server and client
+   * @param {Buffer} head The first packet of the upgraded stream
+   * @private
+   */
+  setSocket (socket, head) {
+    socket.setTimeout(0);
+    socket.setNoDelay();
+
+    this._receiver = new Receiver(this.extensions, this.maxPayload, this.binaryType);
+    this._sender = new Sender(socket, this.extensions);
+    this._ultron = new Ultron(socket);
+    this._socket = socket;
+
+    // socket cleanup handlers
+    this._ultron.on('close', this._finalize);
+    this._ultron.on('error', this._finalize);
+    this._ultron.on('end', this._finalize);
+
+    // ensure that the head is added to the receiver
+    if (head && head.length > 0) {
+      socket.unshift(head);
+      head = null;
+    }
+
+    // subsequent packets are pushed to the receiver
+    this._ultron.on('data', (data) => {
+      this.bytesReceived += data.length;
+      this._receiver.add(data);
+    });
+
+    // receiver event handlers
+    this._receiver.onmessage = (data, flags) => this.emit('message', data, flags);
+    this._receiver.onping = (data, flags) => {
+      this.pong(data, !this._isServer, true);
+      this.emit('ping', data, flags);
+    };
+    this._receiver.onpong = (data, flags) => this.emit('pong', data, flags);
+    this._receiver.onclose = (code, reason) => {
+      this._closeMessage = reason;
+      this._closeCode = code;
+      this.close(code, reason);
+    };
+    this._receiver.onerror = (error, code) => {
+      // close the connection when the receiver reports a HyBi error code
+      this.close(code, '');
+      this.emit('error', error);
+    };
+
+    // sender event handlers
+    this._sender.onerror = (error) => {
+      this.close(1002, '');
+      this.emit('error', error);
+    };
+
+    this.readyState = WebSocket.OPEN;
+    this.emit('open');
+  }
+
+  /**
+   * Clean up and release internal resources.
+   *
+   * @param {(Boolean|Error)} Indicates whether or not an error occurred
+   * @private
+   */
+  finalize (error) {
+    if (this._finalizeCalled) return;
+
+    this.readyState = WebSocket.CLOSING;
+    this._finalizeCalled = true;
+
+    clearTimeout(this._closeTimer);
+    this._closeTimer = null;
+
+    //
+    // If the connection was closed abnormally (with an error), or if the close
+    // control frame was malformed or not received then the close code must be
+    // 1006.
+    //
+    if (error) this._closeCode = 1006;
+
+    if (this._socket) {
+      this._ultron.destroy();
+      this._socket.on('error', function onerror () {
+        this.destroy();
+      });
+
+      if (!error) this._socket.end();
+      else this._socket.destroy();
+
+      this._socket = null;
+      this._ultron = null;
+    }
+
+    if (this._sender) {
+      this._sender = this._sender.onerror = null;
+    }
+
+    if (this._receiver) {
+      this._receiver.cleanup(() => this.emitClose());
+      this._receiver = null;
+    } else {
+      this.emitClose();
+    }
+  }
+
+  /**
+   * Emit the `close` event.
+   *
+   * @private
+   */
+  emitClose () {
+    this.readyState = WebSocket.CLOSED;
+    this.emit('close', this._closeCode || 1006, this._closeMessage || '');
+
+    if (this.extensions[PerMessageDeflate.extensionName]) {
+      this.extensions[PerMessageDeflate.extensionName].cleanup();
+    }
+
+    this.extensions = null;
+
+    this.removeAllListeners();
+    this.on('error', constants.NOOP); // Catch all errors after this.
+  }
+
+  /**
+   * Pause the socket stream.
+   *
+   * @public
+   */
+  pause () {
+    if (this.readyState !== WebSocket.OPEN) throw new Error('not opened');
+
+    this._socket.pause();
+  }
+
+  /**
+   * Resume the socket stream
+   *
+   * @public
+   */
+  resume () {
+    if (this.readyState !== WebSocket.OPEN) throw new Error('not opened');
+
+    this._socket.resume();
+  }
+
+  /**
+   * Start a closing handshake.
+   *
+   * @param {Number} code Status code explaining why the connection is closing
+   * @param {String} data A string explaining why the connection is closing
+   * @public
+   */
+  close (code, data) {
+    if (this.readyState === WebSocket.CLOSED) return;
+    if (this.readyState === WebSocket.CONNECTING) {
+      if (this._req && !this._req.aborted) {
+        this._req.abort();
+        this.emit('error', new Error('closed before the connection is established'));
+        this.finalize(true);
+      }
+      return;
+    }
+
+    if (this.readyState === WebSocket.CLOSING) {
+      if (this._closeCode && this._socket) this._socket.end();
+      return;
+    }
+
+    this.readyState = WebSocket.CLOSING;
+    this._sender.close(code, data, !this._isServer, (err) => {
+      if (err) this.emit('error', err);
+
+      if (this._socket) {
+        if (this._closeCode) this._socket.end();
+        //
+        // Ensure that the connection is cleaned up even when the closing
+        // handshake fails.
+        //
+        clearTimeout(this._closeTimer);
+        this._closeTimer = setTimeout(this._finalize, closeTimeout, true);
+      }
+    });
+  }
+
+  /**
+   * Send a ping message.
+   *
+   * @param {*} data The message to send
+   * @param {Boolean} mask Indicates whether or not to mask `data`
+   * @param {Boolean} failSilently Indicates whether or not to throw if `readyState` isn't `OPEN`
+   * @public
+   */
+  ping (data, mask, failSilently) {
+    if (this.readyState !== WebSocket.OPEN) {
+      if (failSilently) return;
+      throw new Error('not opened');
+    }
+
+    if (typeof data === 'number') data = data.toString();
+    if (mask === undefined) mask = !this._isServer;
+    this._sender.ping(data || constants.EMPTY_BUFFER, mask);
+  }
+
+  /**
+   * Send a pong message.
+   *
+   * @param {*} data The message to send
+   * @param {Boolean} mask Indicates whether or not to mask `data`
+   * @param {Boolean} failSilently Indicates whether or not to throw if `readyState` isn't `OPEN`
+   * @public
+   */
+  pong (data, mask, failSilently) {
+    if (this.readyState !== WebSocket.OPEN) {
+      if (failSilently) return;
+      throw new Error('not opened');
+    }
+
+    if (typeof data === 'number') data = data.toString();
+    if (mask === undefined) mask = !this._isServer;
+    this._sender.pong(data || constants.EMPTY_BUFFER, mask);
+  }
+
+  /**
+   * Send a data message.
+   *
+   * @param {*} data The message to send
+   * @param {Object} options Options object
+   * @param {Boolean} options.compress Specifies whether or not to compress `data`
+   * @param {Boolean} options.binary Specifies whether `data` is binary or text
+   * @param {Boolean} options.fin Specifies whether the fragment is the last one
+   * @param {Boolean} options.mask Specifies whether or not to mask `data`
+   * @param {Function} cb Callback which is executed when data is written out
+   * @public
+   */
+  send (data, options, cb) {
+    if (typeof options === 'function') {
+      cb = options;
+      options = {};
+    }
+
+    if (this.readyState !== WebSocket.OPEN) {
+      if (cb) cb(new Error('not opened'));
+      else throw new Error('not opened');
+      return;
+    }
+
+    if (typeof data === 'number') data = data.toString();
+
+    const opts = Object.assign({
+      binary: typeof data !== 'string',
+      mask: !this._isServer,
+      compress: true,
+      fin: true
+    }, options);
+
+    if (!this.extensions[PerMessageDeflate.extensionName]) {
+      opts.compress = false;
+    }
+
+    this._sender.send(data || constants.EMPTY_BUFFER, opts, cb);
+  }
+
+  /**
+   * Forcibly close the connection.
+   *
+   * @public
+   */
+  terminate () {
+    if (this.readyState === WebSocket.CLOSED) return;
+    if (this.readyState === WebSocket.CONNECTING) {
+      if (this._req && !this._req.aborted) {
+        this._req.abort();
+        this.emit('error', new Error('closed before the connection is established'));
+        this.finalize(true);
+      }
+      return;
+    }
+
+    this.finalize(true);
+  }
+}
+
+WebSocket.CONNECTING = 0;
+WebSocket.OPEN = 1;
+WebSocket.CLOSING = 2;
+WebSocket.CLOSED = 3;
+
+//
+// Add the `onopen`, `onerror`, `onclose`, and `onmessage` attributes.
+// See https://html.spec.whatwg.org/multipage/comms.html#the-websocket-interface
+//
+['open', 'error', 'close', 'message'].forEach((method) => {
+  Object.defineProperty(WebSocket.prototype, `on${method}`, {
+    /**
+     * Return the listener of the event.
+     *
+     * @return {(Function|undefined)} The event listener or `undefined`
+     * @public
+     */
+    get () {
+      const listeners = this.listeners(method);
+      for (var i = 0; i < listeners.length; i++) {
+        if (listeners[i]._listener) return listeners[i]._listener;
+      }
+    },
+    /**
+     * Add a listener for the event.
+     *
+     * @param {Function} listener The listener to add
+     * @public
+     */
+    set (listener) {
+      const listeners = this.listeners(method);
+      for (var i = 0; i < listeners.length; i++) {
+        //
+        // Remove only the listeners added via `addEventListener`.
+        //
+        if (listeners[i]._listener) this.removeListener(method, listeners[i]);
+      }
+      this.addEventListener(method, listener);
+    }
+  });
+});
+
+WebSocket.prototype.addEventListener = EventTarget.addEventListener;
+WebSocket.prototype.removeEventListener = EventTarget.removeEventListener;
+
+module.exports = WebSocket;
+
+/**
+ * Initialize a WebSocket server client.
+ *
+ * @param {http.IncomingMessage} req The request object
+ * @param {net.Socket} socket The network socket between the server and client
+ * @param {Buffer} head The first packet of the upgraded stream
+ * @param {Object} options WebSocket attributes
+ * @param {Number} options.protocolVersion The WebSocket protocol version
+ * @param {Object} options.extensions The negotiated extensions
+ * @param {Number} options.maxPayload The maximum allowed message size
+ * @param {String} options.protocol The chosen subprotocol
+ * @private
+ */
+function initAsServerClient (req, socket, head, options) {
+  this.protocolVersion = options.protocolVersion;
+  this.extensions = options.extensions;
+  this.maxPayload = options.maxPayload;
+  this.protocol = options.protocol;
+
+  this.upgradeReq = req;
+  this._isServer = true;
+
+  this.setSocket(socket, head);
+}
+
+/**
+ * Initialize a WebSocket client.
+ *
+ * @param {String} address The URL to which to connect
+ * @param {String[]} protocols The list of subprotocols
+ * @param {Object} options Connection options
+ * @param {String} options.protocol Value of the `Sec-WebSocket-Protocol` header
+ * @param {(Boolean|Object)} options.perMessageDeflate Enable/disable permessage-deflate
+ * @param {String} options.localAddress Local interface to bind for network connections
+ * @param {Number} options.protocolVersion Value of the `Sec-WebSocket-Version` header
+ * @param {Object} options.headers An object containing request headers
+ * @param {String} options.origin Value of the `Origin` or `Sec-WebSocket-Origin` header
+ * @param {http.Agent} options.agent Use the specified Agent
+ * @param {String} options.host Value of the `Host` header
+ * @param {Number} options.family IP address family to use during hostname lookup (4 or 6).
+ * @param {Function} options.checkServerIdentity A function to validate the server hostname
+ * @param {Boolean} options.rejectUnauthorized Verify or not the server certificate
+ * @param {String} options.passphrase The passphrase for the private key or pfx
+ * @param {String} options.ciphers The ciphers to use or exclude
+ * @param {(String|String[]|Buffer|Buffer[])} options.cert The certificate key
+ * @param {(String|String[]|Buffer|Buffer[])} options.key The private key
+ * @param {(String|Buffer)} options.pfx The private key, certificate, and CA certs
+ * @param {(String|String[]|Buffer|Buffer[])} options.ca Trusted certificates
+ * @private
+ */
+function initAsClient (address, protocols, options) {
+  options = Object.assign({
+    protocolVersion: protocolVersions[1],
+    protocol: protocols.join(','),
+    perMessageDeflate: true,
+    localAddress: null,
+    headers: null,
+    family: null,
+    origin: null,
+    agent: null,
+    host: null,
+
+    //
+    // SSL options.
+    //
+    checkServerIdentity: null,
+    rejectUnauthorized: null,
+    passphrase: null,
+    ciphers: null,
+    cert: null,
+    key: null,
+    pfx: null,
+    ca: null
+  }, options);
+
+  if (protocolVersions.indexOf(options.protocolVersion) === -1) {
+    throw new Error(
+      `unsupported protocol version: ${options.protocolVersion} ` +
+      `(supported versions: ${protocolVersions.join(', ')})`
+    );
+  }
+
+  this.protocolVersion = options.protocolVersion;
+  this._isServer = false;
+  this.url = address;
+
+  const serverUrl = url.parse(address);
+  const isUnixSocket = serverUrl.protocol === 'ws+unix:';
+
+  if (!serverUrl.host && (!isUnixSocket || !serverUrl.path)) {
+    throw new Error('invalid url');
+  }
+
+  const isSecure = serverUrl.protocol === 'wss:' || serverUrl.protocol === 'https:';
+  const key = crypto.randomBytes(16).toString('base64');
+  const httpObj = isSecure ? https : http;
+
+  //
+  // Prepare extensions.
+  //
+  const extensionsOffer = {};
+  var perMessageDeflate;
+
+  if (options.perMessageDeflate) {
+    perMessageDeflate = new PerMessageDeflate(
+      options.perMessageDeflate !== true ? options.perMessageDeflate : {},
+      false
+    );
+    extensionsOffer[PerMessageDeflate.extensionName] = perMessageDeflate.offer();
+  }
+
+  const requestOptions = {
+    port: serverUrl.port || (isSecure ? 443 : 80),
+    host: serverUrl.hostname,
+    path: '/',
+    headers: {
+      'Sec-WebSocket-Version': options.protocolVersion,
+      'Sec-WebSocket-Key': key,
+      'Connection': 'Upgrade',
+      'Upgrade': 'websocket'
+    }
+  };
+
+  if (options.headers) Object.assign(requestOptions.headers, options.headers);
+  if (Object.keys(extensionsOffer).length) {
+    requestOptions.headers['Sec-WebSocket-Extensions'] = Extensions.format(extensionsOffer);
+  }
+  if (options.protocol) {
+    requestOptions.headers['Sec-WebSocket-Protocol'] = options.protocol;
+  }
+  if (options.origin) {
+    if (options.protocolVersion < 13) {
+      requestOptions.headers['Sec-WebSocket-Origin'] = options.origin;
+    } else {
+      requestOptions.headers.Origin = options.origin;
+    }
+  }
+  if (options.host) requestOptions.headers.Host = options.host;
+  if (serverUrl.auth) requestOptions.auth = serverUrl.auth;
+
+  if (options.localAddress) requestOptions.localAddress = options.localAddress;
+  if (options.family) requestOptions.family = options.family;
+
+  if (isUnixSocket) {
+    const parts = serverUrl.path.split(':');
+
+    requestOptions.socketPath = parts[0];
+    requestOptions.path = parts[1];
+  } else if (serverUrl.path) {
+    //
+    // Make sure that path starts with `/`.
+    //
+    if (serverUrl.path.charAt(0) !== '/') {
+      requestOptions.path = `/${serverUrl.path}`;
+    } else {
+      requestOptions.path = serverUrl.path;
+    }
+  }
+
+  var agent = options.agent;
+
+  //
+  // A custom agent is required for these options.
+  //
+  if (
+    options.rejectUnauthorized != null ||
+    options.checkServerIdentity ||
+    options.passphrase ||
+    options.ciphers ||
+    options.cert ||
+    options.key ||
+    options.pfx ||
+    options.ca
+  ) {
+    if (options.passphrase) requestOptions.passphrase = options.passphrase;
+    if (options.ciphers) requestOptions.ciphers = options.ciphers;
+    if (options.cert) requestOptions.cert = options.cert;
+    if (options.key) requestOptions.key = options.key;
+    if (options.pfx) requestOptions.pfx = options.pfx;
+    if (options.ca) requestOptions.ca = options.ca;
+    if (options.checkServerIdentity) {
+      requestOptions.checkServerIdentity = options.checkServerIdentity;
+    }
+    if (options.rejectUnauthorized != null) {
+      requestOptions.rejectUnauthorized = options.rejectUnauthorized;
+    }
+
+    if (!agent) agent = new httpObj.Agent(requestOptions);
+  }
+
+  if (agent) requestOptions.agent = agent;
+
+  this._req = httpObj.get(requestOptions);
+
+  this._req.on('error', (error) => {
+    if (this._req.aborted) return;
+
+    this._req = null;
+    this.emit('error', error);
+    this.finalize(true);
+  });
+
+  this._req.on('response', (res) => {
+    if (!this.emit('unexpected-response', this._req, res)) {
+      this._req.abort();
+      this.emit('error', new Error(`unexpected server response (${res.statusCode})`));
+      this.finalize(true);
+    }
+  });
+
+  this._req.on('upgrade', (res, socket, head) => {
+    this.emit('headers', res.headers, res);
+
+    //
+    // The user may have closed the connection from a listener of the `headers`
+    // event.
+    //
+    if (this.readyState !== WebSocket.CONNECTING) return;
+
+    this._req = null;
+
+    const digest = crypto.createHash('sha1')
+      .update(key + constants.GUID, 'binary')
+      .digest('base64');
+
+    if (res.headers['sec-websocket-accept'] !== digest) {
+      socket.destroy();
+      this.emit('error', new Error('invalid server key'));
+      return this.finalize(true);
+    }
+
+    const serverProt = res.headers['sec-websocket-protocol'];
+    const protList = (options.protocol || '').split(/, */);
+    var protError;
+
+    if (!options.protocol && serverProt) {
+      protError = 'server sent a subprotocol even though none requested';
+    } else if (options.protocol && !serverProt) {
+      protError = 'server sent no subprotocol even though requested';
+    } else if (serverProt && protList.indexOf(serverProt) === -1) {
+      protError = 'server responded with an invalid protocol';
+    }
+
+    if (protError) {
+      socket.destroy();
+      this.emit('error', new Error(protError));
+      return this.finalize(true);
+    }
+
+    if (serverProt) this.protocol = serverProt;
+
+    const serverExtensions = Extensions.parse(res.headers['sec-websocket-extensions']);
+
+    if (perMessageDeflate && serverExtensions[PerMessageDeflate.extensionName]) {
+      try {
+        perMessageDeflate.accept(serverExtensions[PerMessageDeflate.extensionName]);
+      } catch (err) {
+        socket.destroy();
+        this.emit('error', new Error('invalid extension parameter'));
+        return this.finalize(true);
+      }
+
+      this.extensions[PerMessageDeflate.extensionName] = perMessageDeflate;
+    }
+
+    this.setSocket(socket, head);
+  });
+}