853 lines
23 KiB
JavaScript
853 lines
23 KiB
JavaScript
'use strict';
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const EventEmitter = require('events');
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const crypto = require('crypto');
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const https = require('https');
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const http = require('http');
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const net = require('net');
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const tls = require('tls');
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const url = require('url');
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const PerMessageDeflate = require('./permessage-deflate');
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const EventTarget = require('./event-target');
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const extension = require('./extension');
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const constants = require('./constants');
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const Receiver = require('./receiver');
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const Sender = require('./sender');
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const readyStates = ['CONNECTING', 'OPEN', 'CLOSING', 'CLOSED'];
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const kWebSocket = constants.kWebSocket;
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const protocolVersions = [8, 13];
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const closeTimeout = 30 * 1000; // Allow 30 seconds to terminate the connection cleanly.
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/**
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* Class representing a WebSocket.
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*
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* @extends EventEmitter
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*/
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class WebSocket extends EventEmitter {
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/**
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* Create a new `WebSocket`.
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*
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* @param {(String|url.Url|url.URL)} address The URL to which to connect
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* @param {(String|String[])} protocols The subprotocols
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* @param {Object} options Connection options
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*/
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constructor(address, protocols, options) {
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super();
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this.readyState = WebSocket.CONNECTING;
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this.protocol = '';
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this._binaryType = constants.BINARY_TYPES[0];
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this._closeFrameReceived = false;
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this._closeFrameSent = false;
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this._closeMessage = '';
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this._closeTimer = null;
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this._closeCode = 1006;
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this._extensions = {};
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this._isServer = true;
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this._receiver = null;
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this._sender = null;
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this._socket = null;
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if (address !== null) {
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if (Array.isArray(protocols)) {
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protocols = protocols.join(', ');
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} else if (typeof protocols === 'object' && protocols !== null) {
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options = protocols;
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protocols = undefined;
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}
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initAsClient.call(this, address, protocols, options);
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}
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}
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get CONNECTING() {
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return WebSocket.CONNECTING;
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}
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get CLOSING() {
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return WebSocket.CLOSING;
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}
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get CLOSED() {
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return WebSocket.CLOSED;
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}
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get OPEN() {
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return WebSocket.OPEN;
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}
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/**
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* This deviates from the WHATWG interface since ws doesn't support the required
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* default "blob" type (instead we define a custom "nodebuffer" type).
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*
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* @type {String}
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*/
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get binaryType() {
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return this._binaryType;
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}
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set binaryType(type) {
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if (!constants.BINARY_TYPES.includes(type)) return;
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this._binaryType = type;
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//
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// Allow to change `binaryType` on the fly.
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//
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if (this._receiver) this._receiver._binaryType = type;
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}
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/**
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* @type {Number}
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*/
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get bufferedAmount() {
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if (!this._socket) return 0;
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//
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// `socket.bufferSize` is `undefined` if the socket is closed.
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//
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return (this._socket.bufferSize || 0) + this._sender._bufferedBytes;
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}
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/**
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* @type {String}
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*/
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get extensions() {
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return Object.keys(this._extensions).join();
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}
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/**
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* Set up the socket and the internal resources.
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*
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* @param {net.Socket} socket The network socket between the server and client
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* @param {Buffer} head The first packet of the upgraded stream
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* @param {Number} maxPayload The maximum allowed message size
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* @private
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*/
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setSocket(socket, head, maxPayload) {
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const receiver = new Receiver(
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this._binaryType,
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this._extensions,
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maxPayload
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);
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this._sender = new Sender(socket, this._extensions);
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this._receiver = receiver;
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this._socket = socket;
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receiver[kWebSocket] = this;
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socket[kWebSocket] = this;
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receiver.on('conclude', receiverOnConclude);
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receiver.on('drain', receiverOnDrain);
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receiver.on('error', receiverOnError);
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receiver.on('message', receiverOnMessage);
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receiver.on('ping', receiverOnPing);
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receiver.on('pong', receiverOnPong);
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socket.setTimeout(0);
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socket.setNoDelay();
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if (head.length > 0) socket.unshift(head);
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socket.on('close', socketOnClose);
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socket.on('data', socketOnData);
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socket.on('end', socketOnEnd);
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socket.on('error', socketOnError);
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this.readyState = WebSocket.OPEN;
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this.emit('open');
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}
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/**
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* Emit the `'close'` event.
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*
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* @private
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*/
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emitClose() {
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this.readyState = WebSocket.CLOSED;
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if (!this._socket) {
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this.emit('close', this._closeCode, this._closeMessage);
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return;
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}
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if (this._extensions[PerMessageDeflate.extensionName]) {
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this._extensions[PerMessageDeflate.extensionName].cleanup();
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}
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this._receiver.removeAllListeners();
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this.emit('close', this._closeCode, this._closeMessage);
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}
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/**
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* Start a closing handshake.
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*
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* +----------+ +-----------+ +----------+
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* - - -|ws.close()|-->|close frame|-->|ws.close()|- - -
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* | +----------+ +-----------+ +----------+ |
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* +----------+ +-----------+ |
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* CLOSING |ws.close()|<--|close frame|<--+-----+ CLOSING
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* +----------+ +-----------+ |
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* | | | +---+ |
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* +------------------------+-->|fin| - - - -
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* | +---+ | +---+
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* - - - - -|fin|<---------------------+
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* +---+
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*
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* @param {Number} code Status code explaining why the connection is closing
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* @param {String} data A string explaining why the connection is closing
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* @public
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*/
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close(code, data) {
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if (this.readyState === WebSocket.CLOSED) return;
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if (this.readyState === WebSocket.CONNECTING) {
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const msg = 'WebSocket was closed before the connection was established';
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return abortHandshake(this, this._req, msg);
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}
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if (this.readyState === WebSocket.CLOSING) {
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if (this._closeFrameSent && this._closeFrameReceived) this._socket.end();
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return;
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}
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this.readyState = WebSocket.CLOSING;
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this._sender.close(code, data, !this._isServer, (err) => {
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//
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// This error is handled by the `'error'` listener on the socket. We only
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// want to know if the close frame has been sent here.
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//
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if (err) return;
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this._closeFrameSent = true;
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if (this._socket.writable) {
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if (this._closeFrameReceived) this._socket.end();
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//
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// Ensure that the connection is closed even if the closing handshake
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// fails.
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//
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this._closeTimer = setTimeout(
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this._socket.destroy.bind(this._socket),
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closeTimeout
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);
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}
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});
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}
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/**
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* Send a ping.
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*
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* @param {*} data The data to send
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* @param {Boolean} mask Indicates whether or not to mask `data`
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* @param {Function} cb Callback which is executed when the ping is sent
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* @public
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*/
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ping(data, mask, cb) {
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if (typeof data === 'function') {
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cb = data;
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data = mask = undefined;
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} else if (typeof mask === 'function') {
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cb = mask;
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mask = undefined;
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}
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if (this.readyState !== WebSocket.OPEN) {
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const err = new Error(
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`WebSocket is not open: readyState ${this.readyState} ` +
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`(${readyStates[this.readyState]})`
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);
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if (cb) return cb(err);
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throw err;
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}
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if (typeof data === 'number') data = data.toString();
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if (mask === undefined) mask = !this._isServer;
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this._sender.ping(data || constants.EMPTY_BUFFER, mask, cb);
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}
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/**
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* Send a pong.
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*
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* @param {*} data The data to send
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* @param {Boolean} mask Indicates whether or not to mask `data`
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* @param {Function} cb Callback which is executed when the pong is sent
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* @public
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*/
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pong(data, mask, cb) {
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if (typeof data === 'function') {
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cb = data;
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data = mask = undefined;
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} else if (typeof mask === 'function') {
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cb = mask;
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mask = undefined;
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}
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if (this.readyState !== WebSocket.OPEN) {
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const err = new Error(
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`WebSocket is not open: readyState ${this.readyState} ` +
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`(${readyStates[this.readyState]})`
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);
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if (cb) return cb(err);
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throw err;
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}
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if (typeof data === 'number') data = data.toString();
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if (mask === undefined) mask = !this._isServer;
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this._sender.pong(data || constants.EMPTY_BUFFER, mask, cb);
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}
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/**
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* Send a data message.
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*
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* @param {*} data The message to send
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* @param {Object} options Options object
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* @param {Boolean} options.compress Specifies whether or not to compress `data`
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* @param {Boolean} options.binary Specifies whether `data` is binary or text
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* @param {Boolean} options.fin Specifies whether the fragment is the last one
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* @param {Boolean} options.mask Specifies whether or not to mask `data`
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* @param {Function} cb Callback which is executed when data is written out
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* @public
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*/
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send(data, options, cb) {
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if (typeof options === 'function') {
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cb = options;
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options = {};
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}
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if (this.readyState !== WebSocket.OPEN) {
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const err = new Error(
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`WebSocket is not open: readyState ${this.readyState} ` +
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`(${readyStates[this.readyState]})`
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);
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if (cb) return cb(err);
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throw err;
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}
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if (typeof data === 'number') data = data.toString();
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const opts = Object.assign(
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{
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binary: typeof data !== 'string',
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mask: !this._isServer,
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compress: true,
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fin: true
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},
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options
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);
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if (!this._extensions[PerMessageDeflate.extensionName]) {
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opts.compress = false;
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}
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this._sender.send(data || constants.EMPTY_BUFFER, opts, cb);
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}
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/**
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* Forcibly close the connection.
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*
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* @public
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*/
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terminate() {
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if (this.readyState === WebSocket.CLOSED) return;
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if (this.readyState === WebSocket.CONNECTING) {
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const msg = 'WebSocket was closed before the connection was established';
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return abortHandshake(this, this._req, msg);
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}
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if (this._socket) {
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this.readyState = WebSocket.CLOSING;
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this._socket.destroy();
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}
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}
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}
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readyStates.forEach((readyState, i) => {
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WebSocket[readyState] = i;
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});
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//
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// Add the `onopen`, `onerror`, `onclose`, and `onmessage` attributes.
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// See https://html.spec.whatwg.org/multipage/comms.html#the-websocket-interface
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//
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['open', 'error', 'close', 'message'].forEach((method) => {
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Object.defineProperty(WebSocket.prototype, `on${method}`, {
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/**
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* Return the listener of the event.
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*
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* @return {(Function|undefined)} The event listener or `undefined`
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* @public
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*/
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get() {
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const listeners = this.listeners(method);
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for (var i = 0; i < listeners.length; i++) {
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if (listeners[i]._listener) return listeners[i]._listener;
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}
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return undefined;
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},
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/**
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* Add a listener for the event.
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*
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* @param {Function} listener The listener to add
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* @public
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*/
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set(listener) {
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const listeners = this.listeners(method);
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for (var i = 0; i < listeners.length; i++) {
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//
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// Remove only the listeners added via `addEventListener`.
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//
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if (listeners[i]._listener) this.removeListener(method, listeners[i]);
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}
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this.addEventListener(method, listener);
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}
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});
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});
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WebSocket.prototype.addEventListener = EventTarget.addEventListener;
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WebSocket.prototype.removeEventListener = EventTarget.removeEventListener;
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module.exports = WebSocket;
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/**
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* Initialize a WebSocket client.
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*
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* @param {(String|url.Url|url.URL)} address The URL to which to connect
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* @param {String} protocols The subprotocols
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* @param {Object} options Connection options
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* @param {(Boolean|Object)} options.perMessageDeflate Enable/disable permessage-deflate
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* @param {Number} options.handshakeTimeout Timeout in milliseconds for the handshake request
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* @param {Number} options.protocolVersion Value of the `Sec-WebSocket-Version` header
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* @param {String} options.origin Value of the `Origin` or `Sec-WebSocket-Origin` header
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* @param {Number} options.maxPayload The maximum allowed message size
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* @private
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*/
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function initAsClient(address, protocols, options) {
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options = Object.assign(
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{
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protocolVersion: protocolVersions[1],
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perMessageDeflate: true,
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maxPayload: 100 * 1024 * 1024
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},
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options,
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{
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createConnection: undefined,
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socketPath: undefined,
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hostname: undefined,
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protocol: undefined,
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timeout: undefined,
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method: undefined,
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auth: undefined,
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host: undefined,
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path: undefined,
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port: undefined
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}
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);
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if (!protocolVersions.includes(options.protocolVersion)) {
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throw new RangeError(
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`Unsupported protocol version: ${options.protocolVersion} ` +
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`(supported versions: ${protocolVersions.join(', ')})`
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);
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}
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this._isServer = false;
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var parsedUrl;
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if (typeof address === 'object' && address.href !== undefined) {
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parsedUrl = address;
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this.url = address.href;
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} else {
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//
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// The WHATWG URL constructor is not available on Node.js < 6.13.0
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//
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parsedUrl = url.URL ? new url.URL(address) : url.parse(address);
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this.url = address;
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}
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const isUnixSocket = parsedUrl.protocol === 'ws+unix:';
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if (!parsedUrl.host && (!isUnixSocket || !parsedUrl.pathname)) {
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throw new Error(`Invalid URL: ${this.url}`);
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}
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const isSecure =
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parsedUrl.protocol === 'wss:' || parsedUrl.protocol === 'https:';
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const defaultPort = isSecure ? 443 : 80;
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const key = crypto.randomBytes(16).toString('base64');
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const httpObj = isSecure ? https : http;
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const path = parsedUrl.search
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? `${parsedUrl.pathname || '/'}${parsedUrl.search}`
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: parsedUrl.pathname || '/';
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var perMessageDeflate;
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options.createConnection = isSecure ? tlsConnect : netConnect;
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options.defaultPort = options.defaultPort || defaultPort;
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options.port = parsedUrl.port || defaultPort;
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options.host = parsedUrl.hostname.startsWith('[')
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? parsedUrl.hostname.slice(1, -1)
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: parsedUrl.hostname;
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options.headers = Object.assign(
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{
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'Sec-WebSocket-Version': options.protocolVersion,
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'Sec-WebSocket-Key': key,
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Connection: 'Upgrade',
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Upgrade: 'websocket'
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},
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options.headers
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);
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options.path = path;
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options.timeout = options.handshakeTimeout;
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if (options.perMessageDeflate) {
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perMessageDeflate = new PerMessageDeflate(
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options.perMessageDeflate !== true ? options.perMessageDeflate : {},
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false,
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options.maxPayload
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);
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options.headers['Sec-WebSocket-Extensions'] = extension.format({
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[PerMessageDeflate.extensionName]: perMessageDeflate.offer()
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});
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}
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if (protocols) {
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options.headers['Sec-WebSocket-Protocol'] = protocols;
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}
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if (options.origin) {
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if (options.protocolVersion < 13) {
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options.headers['Sec-WebSocket-Origin'] = options.origin;
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} else {
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options.headers.Origin = options.origin;
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}
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}
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if (parsedUrl.auth) {
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options.auth = parsedUrl.auth;
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} else if (parsedUrl.username || parsedUrl.password) {
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options.auth = `${parsedUrl.username}:${parsedUrl.password}`;
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}
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if (isUnixSocket) {
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const parts = path.split(':');
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options.socketPath = parts[0];
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options.path = parts[1];
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}
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var req = (this._req = httpObj.get(options));
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if (options.handshakeTimeout) {
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req.on('timeout', () => {
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abortHandshake(this, req, 'Opening handshake has timed out');
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});
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}
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req.on('error', (err) => {
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if (this._req.aborted) return;
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req = this._req = null;
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this.readyState = WebSocket.CLOSING;
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this.emit('error', err);
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this.emitClose();
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});
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req.on('response', (res) => {
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if (this.emit('unexpected-response', req, res)) return;
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abortHandshake(this, req, `Unexpected server response: ${res.statusCode}`);
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});
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req.on('upgrade', (res, socket, head) => {
|
|
this.emit('upgrade', res);
|
|
|
|
//
|
|
// The user may have closed the connection from a listener of the `upgrade`
|
|
// event.
|
|
//
|
|
if (this.readyState !== WebSocket.CONNECTING) return;
|
|
|
|
req = this._req = null;
|
|
|
|
const digest = crypto
|
|
.createHash('sha1')
|
|
.update(key + constants.GUID, 'binary')
|
|
.digest('base64');
|
|
|
|
if (res.headers['sec-websocket-accept'] !== digest) {
|
|
abortHandshake(this, socket, 'Invalid Sec-WebSocket-Accept header');
|
|
return;
|
|
}
|
|
|
|
const serverProt = res.headers['sec-websocket-protocol'];
|
|
const protList = (protocols || '').split(/, */);
|
|
var protError;
|
|
|
|
if (!protocols && serverProt) {
|
|
protError = 'Server sent a subprotocol but none was requested';
|
|
} else if (protocols && !serverProt) {
|
|
protError = 'Server sent no subprotocol';
|
|
} else if (serverProt && !protList.includes(serverProt)) {
|
|
protError = 'Server sent an invalid subprotocol';
|
|
}
|
|
|
|
if (protError) {
|
|
abortHandshake(this, socket, protError);
|
|
return;
|
|
}
|
|
|
|
if (serverProt) this.protocol = serverProt;
|
|
|
|
if (perMessageDeflate) {
|
|
try {
|
|
const extensions = extension.parse(
|
|
res.headers['sec-websocket-extensions']
|
|
);
|
|
|
|
if (extensions[PerMessageDeflate.extensionName]) {
|
|
perMessageDeflate.accept(extensions[PerMessageDeflate.extensionName]);
|
|
this._extensions[PerMessageDeflate.extensionName] = perMessageDeflate;
|
|
}
|
|
} catch (err) {
|
|
abortHandshake(this, socket, 'Invalid Sec-WebSocket-Extensions header');
|
|
return;
|
|
}
|
|
}
|
|
|
|
this.setSocket(socket, head, options.maxPayload);
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Create a `net.Socket` and initiate a connection.
|
|
*
|
|
* @param {Object} options Connection options
|
|
* @return {net.Socket} The newly created socket used to start the connection
|
|
* @private
|
|
*/
|
|
function netConnect(options) {
|
|
//
|
|
// Override `options.path` only if `options` is a copy of the original options
|
|
// object. This is always true on Node.js >= 8 but not on Node.js 6 where
|
|
// `options.socketPath` might be `undefined` even if the `socketPath` option
|
|
// was originally set.
|
|
//
|
|
if (options.protocolVersion) options.path = options.socketPath;
|
|
return net.connect(options);
|
|
}
|
|
|
|
/**
|
|
* Create a `tls.TLSSocket` and initiate a connection.
|
|
*
|
|
* @param {Object} options Connection options
|
|
* @return {tls.TLSSocket} The newly created socket used to start the connection
|
|
* @private
|
|
*/
|
|
function tlsConnect(options) {
|
|
options.path = undefined;
|
|
options.servername = options.servername || options.host;
|
|
return tls.connect(options);
|
|
}
|
|
|
|
/**
|
|
* Abort the handshake and emit an error.
|
|
*
|
|
* @param {WebSocket} websocket The WebSocket instance
|
|
* @param {(http.ClientRequest|net.Socket)} stream The request to abort or the
|
|
* socket to destroy
|
|
* @param {String} message The error message
|
|
* @private
|
|
*/
|
|
function abortHandshake(websocket, stream, message) {
|
|
websocket.readyState = WebSocket.CLOSING;
|
|
|
|
const err = new Error(message);
|
|
Error.captureStackTrace(err, abortHandshake);
|
|
|
|
if (stream.setHeader) {
|
|
stream.abort();
|
|
stream.once('abort', websocket.emitClose.bind(websocket));
|
|
websocket.emit('error', err);
|
|
} else {
|
|
stream.destroy(err);
|
|
stream.once('error', websocket.emit.bind(websocket, 'error'));
|
|
stream.once('close', websocket.emitClose.bind(websocket));
|
|
}
|
|
}
|
|
|
|
/**
|
|
* The listener of the `Receiver` `'conclude'` event.
|
|
*
|
|
* @param {Number} code The status code
|
|
* @param {String} reason The reason for closing
|
|
* @private
|
|
*/
|
|
function receiverOnConclude(code, reason) {
|
|
const websocket = this[kWebSocket];
|
|
|
|
websocket._socket.removeListener('data', socketOnData);
|
|
websocket._socket.resume();
|
|
|
|
websocket._closeFrameReceived = true;
|
|
websocket._closeMessage = reason;
|
|
websocket._closeCode = code;
|
|
|
|
if (code === 1005) websocket.close();
|
|
else websocket.close(code, reason);
|
|
}
|
|
|
|
/**
|
|
* The listener of the `Receiver` `'drain'` event.
|
|
*
|
|
* @private
|
|
*/
|
|
function receiverOnDrain() {
|
|
this[kWebSocket]._socket.resume();
|
|
}
|
|
|
|
/**
|
|
* The listener of the `Receiver` `'error'` event.
|
|
*
|
|
* @param {(RangeError|Error)} err The emitted error
|
|
* @private
|
|
*/
|
|
function receiverOnError(err) {
|
|
const websocket = this[kWebSocket];
|
|
|
|
websocket._socket.removeListener('data', socketOnData);
|
|
|
|
websocket.readyState = WebSocket.CLOSING;
|
|
websocket._closeCode = err[constants.kStatusCode];
|
|
websocket.emit('error', err);
|
|
websocket._socket.destroy();
|
|
}
|
|
|
|
/**
|
|
* The listener of the `Receiver` `'finish'` event.
|
|
*
|
|
* @private
|
|
*/
|
|
function receiverOnFinish() {
|
|
this[kWebSocket].emitClose();
|
|
}
|
|
|
|
/**
|
|
* The listener of the `Receiver` `'message'` event.
|
|
*
|
|
* @param {(String|Buffer|ArrayBuffer|Buffer[])} data The message
|
|
* @private
|
|
*/
|
|
function receiverOnMessage(data) {
|
|
this[kWebSocket].emit('message', data);
|
|
}
|
|
|
|
/**
|
|
* The listener of the `Receiver` `'ping'` event.
|
|
*
|
|
* @param {Buffer} data The data included in the ping frame
|
|
* @private
|
|
*/
|
|
function receiverOnPing(data) {
|
|
const websocket = this[kWebSocket];
|
|
|
|
websocket.pong(data, !websocket._isServer, constants.NOOP);
|
|
websocket.emit('ping', data);
|
|
}
|
|
|
|
/**
|
|
* The listener of the `Receiver` `'pong'` event.
|
|
*
|
|
* @param {Buffer} data The data included in the pong frame
|
|
* @private
|
|
*/
|
|
function receiverOnPong(data) {
|
|
this[kWebSocket].emit('pong', data);
|
|
}
|
|
|
|
/**
|
|
* The listener of the `net.Socket` `'close'` event.
|
|
*
|
|
* @private
|
|
*/
|
|
function socketOnClose() {
|
|
const websocket = this[kWebSocket];
|
|
|
|
this.removeListener('close', socketOnClose);
|
|
this.removeListener('end', socketOnEnd);
|
|
|
|
websocket.readyState = WebSocket.CLOSING;
|
|
|
|
//
|
|
// The close frame might not have been received or the `'end'` event emitted,
|
|
// for example, if the socket was destroyed due to an error. Ensure that the
|
|
// `receiver` stream is closed after writing any remaining buffered data to
|
|
// it. If the readable side of the socket is in flowing mode then there is no
|
|
// buffered data as everything has been already written and `readable.read()`
|
|
// will return `null`. If instead, the socket is paused, any possible buffered
|
|
// data will be read as a single chunk and emitted synchronously in a single
|
|
// `'data'` event.
|
|
//
|
|
websocket._socket.read();
|
|
websocket._receiver.end();
|
|
|
|
this.removeListener('data', socketOnData);
|
|
this[kWebSocket] = undefined;
|
|
|
|
clearTimeout(websocket._closeTimer);
|
|
|
|
if (
|
|
websocket._receiver._writableState.finished ||
|
|
websocket._receiver._writableState.errorEmitted
|
|
) {
|
|
websocket.emitClose();
|
|
} else {
|
|
websocket._receiver.on('error', receiverOnFinish);
|
|
websocket._receiver.on('finish', receiverOnFinish);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* The listener of the `net.Socket` `'data'` event.
|
|
*
|
|
* @param {Buffer} chunk A chunk of data
|
|
* @private
|
|
*/
|
|
function socketOnData(chunk) {
|
|
if (!this[kWebSocket]._receiver.write(chunk)) {
|
|
this.pause();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* The listener of the `net.Socket` `'end'` event.
|
|
*
|
|
* @private
|
|
*/
|
|
function socketOnEnd() {
|
|
const websocket = this[kWebSocket];
|
|
|
|
websocket.readyState = WebSocket.CLOSING;
|
|
websocket._receiver.end();
|
|
this.end();
|
|
}
|
|
|
|
/**
|
|
* The listener of the `net.Socket` `'error'` event.
|
|
*
|
|
* @private
|
|
*/
|
|
function socketOnError() {
|
|
const websocket = this[kWebSocket];
|
|
|
|
this.removeListener('error', socketOnError);
|
|
this.on('error', constants.NOOP);
|
|
|
|
if (websocket) {
|
|
websocket.readyState = WebSocket.CLOSING;
|
|
this.destroy();
|
|
}
|
|
}
|