Index: frontend/node_modules/ws/lib/buffer-util.js =================================================================== --- frontend/node_modules/ws/lib/buffer-util.js (revision 9af201e94b5a79beb92a30858fc54de4bc3b9449) +++ frontend/node_modules/ws/lib/buffer-util.js (revision 9af201e94b5a79beb92a30858fc54de4bc3b9449) @@ -0,0 +1,129 @@ +'use strict'; + +const { EMPTY_BUFFER } = require('./constants'); + +/** + * Merges an array of buffers into a new buffer. + * + * @param {Buffer[]} list The array of buffers to concat + * @param {Number} totalLength The total length of buffers in the list + * @return {Buffer} The resulting buffer + * @public + */ +function concat(list, totalLength) { + if (list.length === 0) return EMPTY_BUFFER; + if (list.length === 1) return list[0]; + + const target = Buffer.allocUnsafe(totalLength); + let offset = 0; + + for (let i = 0; i < list.length; i++) { + const buf = list[i]; + target.set(buf, offset); + offset += buf.length; + } + + if (offset < totalLength) return target.slice(0, offset); + + return target; +} + +/** + * Masks a buffer using the given mask. + * + * @param {Buffer} source The buffer to mask + * @param {Buffer} mask The mask to use + * @param {Buffer} output The buffer where to store the result + * @param {Number} offset The offset at which to start writing + * @param {Number} length The number of bytes to mask. + * @public + */ +function _mask(source, mask, output, offset, length) { + for (let i = 0; i < length; i++) { + output[offset + i] = source[i] ^ mask[i & 3]; + } +} + +/** + * Unmasks a buffer using the given mask. + * + * @param {Buffer} buffer The buffer to unmask + * @param {Buffer} mask The mask to use + * @public + */ +function _unmask(buffer, mask) { + // Required until https://github.com/nodejs/node/issues/9006 is resolved. + const length = buffer.length; + for (let i = 0; i < length; i++) { + buffer[i] ^= mask[i & 3]; + } +} + +/** + * Converts a buffer to an `ArrayBuffer`. + * + * @param {Buffer} buf The buffer to convert + * @return {ArrayBuffer} Converted buffer + * @public + */ +function toArrayBuffer(buf) { + if (buf.byteLength === buf.buffer.byteLength) { + return buf.buffer; + } + + return buf.buffer.slice(buf.byteOffset, buf.byteOffset + buf.byteLength); +} + +/** + * Converts `data` to a `Buffer`. + * + * @param {*} data The data to convert + * @return {Buffer} The buffer + * @throws {TypeError} + * @public + */ +function toBuffer(data) { + toBuffer.readOnly = true; + + if (Buffer.isBuffer(data)) return data; + + let buf; + + if (data instanceof ArrayBuffer) { + buf = Buffer.from(data); + } else if (ArrayBuffer.isView(data)) { + buf = Buffer.from(data.buffer, data.byteOffset, data.byteLength); + } else { + buf = Buffer.from(data); + toBuffer.readOnly = false; + } + + return buf; +} + +try { + const bufferUtil = require('bufferutil'); + const bu = bufferUtil.BufferUtil || bufferUtil; + + module.exports = { + concat, + mask(source, mask, output, offset, length) { + if (length < 48) _mask(source, mask, output, offset, length); + else bu.mask(source, mask, output, offset, length); + }, + toArrayBuffer, + toBuffer, + unmask(buffer, mask) { + if (buffer.length < 32) _unmask(buffer, mask); + else bu.unmask(buffer, mask); + } + }; +} catch (e) /* istanbul ignore next */ { + module.exports = { + concat, + mask: _mask, + toArrayBuffer, + toBuffer, + unmask: _unmask + }; +} Index: frontend/node_modules/ws/lib/constants.js =================================================================== --- frontend/node_modules/ws/lib/constants.js (revision 9af201e94b5a79beb92a30858fc54de4bc3b9449) +++ frontend/node_modules/ws/lib/constants.js (revision 9af201e94b5a79beb92a30858fc54de4bc3b9449) @@ -0,0 +1,10 @@ +'use strict'; + +module.exports = { + BINARY_TYPES: ['nodebuffer', 'arraybuffer', 'fragments'], + GUID: '258EAFA5-E914-47DA-95CA-C5AB0DC85B11', + kStatusCode: Symbol('status-code'), + kWebSocket: Symbol('websocket'), + EMPTY_BUFFER: Buffer.alloc(0), + NOOP: () => {} +}; Index: frontend/node_modules/ws/lib/event-target.js =================================================================== --- frontend/node_modules/ws/lib/event-target.js (revision 9af201e94b5a79beb92a30858fc54de4bc3b9449) +++ frontend/node_modules/ws/lib/event-target.js (revision 9af201e94b5a79beb92a30858fc54de4bc3b9449) @@ -0,0 +1,184 @@ +'use strict'; + +/** + * Class representing an event. + * + * @private + */ +class Event { + /** + * Create a new `Event`. + * + * @param {String} type The name of the event + * @param {Object} target A reference to the target to which the event was + * dispatched + */ + constructor(type, target) { + this.target = target; + this.type = type; + } +} + +/** + * Class representing a message event. + * + * @extends Event + * @private + */ +class MessageEvent extends Event { + /** + * Create a new `MessageEvent`. + * + * @param {(String|Buffer|ArrayBuffer|Buffer[])} data The received data + * @param {WebSocket} target A reference to the target to which the event was + * dispatched + */ + constructor(data, target) { + super('message', target); + + this.data = data; + } +} + +/** + * Class representing a close event. + * + * @extends Event + * @private + */ +class CloseEvent extends Event { + /** + * Create a new `CloseEvent`. + * + * @param {Number} code The status code explaining why the connection is being + * closed + * @param {String} reason A human-readable string explaining why the + * connection is closing + * @param {WebSocket} target A reference to the target to which the event was + * dispatched + */ + constructor(code, reason, target) { + super('close', target); + + this.wasClean = target._closeFrameReceived && target._closeFrameSent; + this.reason = reason; + this.code = code; + } +} + +/** + * Class representing an open event. + * + * @extends Event + * @private + */ +class OpenEvent extends Event { + /** + * Create a new `OpenEvent`. + * + * @param {WebSocket} target A reference to the target to which the event was + * dispatched + */ + constructor(target) { + super('open', target); + } +} + +/** + * Class representing an error event. + * + * @extends Event + * @private + */ +class ErrorEvent extends Event { + /** + * Create a new `ErrorEvent`. + * + * @param {Object} error The error that generated this event + * @param {WebSocket} target A reference to the target to which the event was + * dispatched + */ + constructor(error, target) { + super('error', target); + + this.message = error.message; + this.error = error; + } +} + +/** + * This provides methods for emulating the `EventTarget` interface. It's not + * meant to be used directly. + * + * @mixin + */ +const EventTarget = { + /** + * Register an event listener. + * + * @param {String} type A string representing the event type to listen for + * @param {Function} listener The listener to add + * @param {Object} [options] An options object specifies characteristics about + * the event listener + * @param {Boolean} [options.once=false] A `Boolean`` indicating that the + * listener should be invoked at most once after being added. If `true`, + * the listener would be automatically removed when invoked. + * @public + */ + addEventListener(type, listener, options) { + if (typeof listener !== 'function') return; + + function onMessage(data) { + listener.call(this, new MessageEvent(data, this)); + } + + function onClose(code, message) { + listener.call(this, new CloseEvent(code, message, this)); + } + + function onError(error) { + listener.call(this, new ErrorEvent(error, this)); + } + + function onOpen() { + listener.call(this, new OpenEvent(this)); + } + + const method = options && options.once ? 'once' : 'on'; + + if (type === 'message') { + onMessage._listener = listener; + this[method](type, onMessage); + } else if (type === 'close') { + onClose._listener = listener; + this[method](type, onClose); + } else if (type === 'error') { + onError._listener = listener; + this[method](type, onError); + } else if (type === 'open') { + onOpen._listener = listener; + this[method](type, onOpen); + } else { + this[method](type, listener); + } + }, + + /** + * Remove an event listener. + * + * @param {String} type A string representing the event type to remove + * @param {Function} listener The listener to remove + * @public + */ + removeEventListener(type, listener) { + const listeners = this.listeners(type); + + for (let i = 0; i < listeners.length; i++) { + if (listeners[i] === listener || listeners[i]._listener === listener) { + this.removeListener(type, listeners[i]); + } + } + } +}; + +module.exports = EventTarget; Index: frontend/node_modules/ws/lib/extension.js =================================================================== --- frontend/node_modules/ws/lib/extension.js (revision 9af201e94b5a79beb92a30858fc54de4bc3b9449) +++ frontend/node_modules/ws/lib/extension.js (revision 9af201e94b5a79beb92a30858fc54de4bc3b9449) @@ -0,0 +1,223 @@ +'use strict'; + +// +// Allowed token characters: +// +// '!', '#', '$', '%', '&', ''', '*', '+', '-', +// '.', 0-9, A-Z, '^', '_', '`', a-z, '|', '~' +// +// tokenChars[32] === 0 // ' ' +// tokenChars[33] === 1 // '!' +// tokenChars[34] === 0 // '"' +// ... +// +// prettier-ignore +const tokenChars = [ + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0 - 15 + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 16 - 31 + 0, 1, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 1, 1, 0, // 32 - 47 + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, // 48 - 63 + 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 64 - 79 + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, // 80 - 95 + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 96 - 111 + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0 // 112 - 127 +]; + +/** + * Adds an offer to the map of extension offers or a parameter to the map of + * parameters. + * + * @param {Object} dest The map of extension offers or parameters + * @param {String} name The extension or parameter name + * @param {(Object|Boolean|String)} elem The extension parameters or the + * parameter value + * @private + */ +function push(dest, name, elem) { + if (dest[name] === undefined) dest[name] = [elem]; + else dest[name].push(elem); +} + +/** + * Parses the `Sec-WebSocket-Extensions` header into an object. + * + * @param {String} header The field value of the header + * @return {Object} The parsed object + * @public + */ +function parse(header) { + const offers = Object.create(null); + + if (header === undefined || header === '') return offers; + + let params = Object.create(null); + let mustUnescape = false; + let isEscaping = false; + let inQuotes = false; + let extensionName; + let paramName; + let start = -1; + let end = -1; + let i = 0; + + for (; i < header.length; i++) { + const code = header.charCodeAt(i); + + if (extensionName === undefined) { + if (end === -1 && tokenChars[code] === 1) { + if (start === -1) start = i; + } else if (code === 0x20 /* ' ' */ || code === 0x09 /* '\t' */) { + if (end === -1 && start !== -1) end = i; + } else if (code === 0x3b /* ';' */ || code === 0x2c /* ',' */) { + if (start === -1) { + throw new SyntaxError(`Unexpected character at index ${i}`); + } + + if (end === -1) end = i; + const name = header.slice(start, end); + if (code === 0x2c) { + push(offers, name, params); + params = Object.create(null); + } else { + extensionName = name; + } + + start = end = -1; + } else { + throw new SyntaxError(`Unexpected character at index ${i}`); + } + } else if (paramName === undefined) { + if (end === -1 && tokenChars[code] === 1) { + if (start === -1) start = i; + } else if (code === 0x20 || code === 0x09) { + if (end === -1 && start !== -1) end = i; + } else if (code === 0x3b || code === 0x2c) { + if (start === -1) { + throw new SyntaxError(`Unexpected character at index ${i}`); + } + + if (end === -1) end = i; + push(params, header.slice(start, end), true); + if (code === 0x2c) { + push(offers, extensionName, params); + params = Object.create(null); + extensionName = undefined; + } + + start = end = -1; + } else if (code === 0x3d /* '=' */ && start !== -1 && end === -1) { + paramName = header.slice(start, i); + start = end = -1; + } else { + throw new SyntaxError(`Unexpected character at index ${i}`); + } + } else { + // + // The value of a quoted-string after unescaping must conform to the + // token ABNF, so only token characters are valid. + // Ref: https://tools.ietf.org/html/rfc6455#section-9.1 + // + if (isEscaping) { + if (tokenChars[code] !== 1) { + throw new SyntaxError(`Unexpected character at index ${i}`); + } + if (start === -1) start = i; + else if (!mustUnescape) mustUnescape = true; + isEscaping = false; + } else if (inQuotes) { + if (tokenChars[code] === 1) { + if (start === -1) start = i; + } else if (code === 0x22 /* '"' */ && start !== -1) { + inQuotes = false; + end = i; + } else if (code === 0x5c /* '\' */) { + isEscaping = true; + } else { + throw new SyntaxError(`Unexpected character at index ${i}`); + } + } else if (code === 0x22 && header.charCodeAt(i - 1) === 0x3d) { + inQuotes = true; + } else if (end === -1 && tokenChars[code] === 1) { + if (start === -1) start = i; + } else if (start !== -1 && (code === 0x20 || code === 0x09)) { + if (end === -1) end = i; + } else if (code === 0x3b || code === 0x2c) { + if (start === -1) { + throw new SyntaxError(`Unexpected character at index ${i}`); + } + + if (end === -1) end = i; + let value = header.slice(start, end); + if (mustUnescape) { + value = value.replace(/\\/g, ''); + mustUnescape = false; + } + push(params, paramName, value); + if (code === 0x2c) { + push(offers, extensionName, params); + params = Object.create(null); + extensionName = undefined; + } + + paramName = undefined; + start = end = -1; + } else { + throw new SyntaxError(`Unexpected character at index ${i}`); + } + } + } + + if (start === -1 || inQuotes) { + throw new SyntaxError('Unexpected end of input'); + } + + if (end === -1) end = i; + const token = header.slice(start, end); + if (extensionName === undefined) { + push(offers, token, params); + } else { + if (paramName === undefined) { + push(params, token, true); + } else if (mustUnescape) { + push(params, paramName, token.replace(/\\/g, '')); + } else { + push(params, paramName, token); + } + push(offers, extensionName, params); + } + + return offers; +} + +/** + * Builds the `Sec-WebSocket-Extensions` header field value. + * + * @param {Object} extensions The map of extensions and parameters to format + * @return {String} A string representing the given object + * @public + */ +function format(extensions) { + return Object.keys(extensions) + .map((extension) => { + let configurations = extensions[extension]; + if (!Array.isArray(configurations)) configurations = [configurations]; + return configurations + .map((params) => { + return [extension] + .concat( + Object.keys(params).map((k) => { + let values = params[k]; + if (!Array.isArray(values)) values = [values]; + return values + .map((v) => (v === true ? k : `${k}=${v}`)) + .join('; '); + }) + ) + .join('; '); + }) + .join(', '); + }) + .join(', '); +} + +module.exports = { format, parse }; Index: frontend/node_modules/ws/lib/limiter.js =================================================================== --- frontend/node_modules/ws/lib/limiter.js (revision 9af201e94b5a79beb92a30858fc54de4bc3b9449) +++ frontend/node_modules/ws/lib/limiter.js (revision 9af201e94b5a79beb92a30858fc54de4bc3b9449) @@ -0,0 +1,55 @@ +'use strict'; + +const kDone = Symbol('kDone'); +const kRun = Symbol('kRun'); + +/** + * A very simple job queue with adjustable concurrency. Adapted from + * https://github.com/STRML/async-limiter + */ +class Limiter { + /** + * Creates a new `Limiter`. + * + * @param {Number} [concurrency=Infinity] The maximum number of jobs allowed + * to run concurrently + */ + constructor(concurrency) { + this[kDone] = () => { + this.pending--; + this[kRun](); + }; + this.concurrency = concurrency || Infinity; + this.jobs = []; + this.pending = 0; + } + + /** + * Adds a job to the queue. + * + * @param {Function} job The job to run + * @public + */ + add(job) { + this.jobs.push(job); + this[kRun](); + } + + /** + * Removes a job from the queue and runs it if possible. + * + * @private + */ + [kRun]() { + if (this.pending === this.concurrency) return; + + if (this.jobs.length) { + const job = this.jobs.shift(); + + this.pending++; + job(this[kDone]); + } + } +} + +module.exports = Limiter; Index: frontend/node_modules/ws/lib/permessage-deflate.js =================================================================== --- frontend/node_modules/ws/lib/permessage-deflate.js (revision 9af201e94b5a79beb92a30858fc54de4bc3b9449) +++ frontend/node_modules/ws/lib/permessage-deflate.js (revision 9af201e94b5a79beb92a30858fc54de4bc3b9449) @@ -0,0 +1,518 @@ +'use strict'; + +const zlib = require('zlib'); + +const bufferUtil = require('./buffer-util'); +const Limiter = require('./limiter'); +const { kStatusCode, NOOP } = require('./constants'); + +const TRAILER = Buffer.from([0x00, 0x00, 0xff, 0xff]); +const kPerMessageDeflate = Symbol('permessage-deflate'); +const kTotalLength = Symbol('total-length'); +const kCallback = Symbol('callback'); +const kBuffers = Symbol('buffers'); +const kError = Symbol('error'); + +// +// We limit zlib concurrency, which prevents severe memory fragmentation +// as documented in https://github.com/nodejs/node/issues/8871#issuecomment-250915913 +// and https://github.com/websockets/ws/issues/1202 +// +// Intentionally global; it's the global thread pool that's an issue. +// +let zlibLimiter; + +/** + * permessage-deflate implementation. + */ +class PerMessageDeflate { + /** + * Creates a PerMessageDeflate instance. + * + * @param {Object} [options] Configuration options + * @param {Boolean} [options.serverNoContextTakeover=false] Request/accept + * disabling of server context takeover + * @param {Boolean} [options.clientNoContextTakeover=false] Advertise/ + * acknowledge disabling of client context takeover + * @param {(Boolean|Number)} [options.serverMaxWindowBits] Request/confirm the + * use of a custom server window size + * @param {(Boolean|Number)} [options.clientMaxWindowBits] Advertise support + * for, or request, a custom client window size + * @param {Object} [options.zlibDeflateOptions] Options to pass to zlib on + * deflate + * @param {Object} [options.zlibInflateOptions] Options to pass to zlib on + * inflate + * @param {Number} [options.threshold=1024] Size (in bytes) below which + * messages should not be compressed + * @param {Number} [options.concurrencyLimit=10] The number of concurrent + * calls to zlib + * @param {Boolean} [isServer=false] Create the instance in either server or + * client mode + * @param {Number} [maxPayload=0] The maximum allowed message length + */ + constructor(options, isServer, maxPayload) { + this._maxPayload = maxPayload | 0; + this._options = options || {}; + this._threshold = + this._options.threshold !== undefined ? this._options.threshold : 1024; + this._isServer = !!isServer; + this._deflate = null; + this._inflate = null; + + this.params = null; + + if (!zlibLimiter) { + const concurrency = + this._options.concurrencyLimit !== undefined + ? this._options.concurrencyLimit + : 10; + zlibLimiter = new Limiter(concurrency); + } + } + + /** + * @type {String} + */ + static get extensionName() { + return 'permessage-deflate'; + } + + /** + * Create an extension negotiation offer. + * + * @return {Object} Extension parameters + * @public + */ + offer() { + const params = {}; + + if (this._options.serverNoContextTakeover) { + params.server_no_context_takeover = true; + } + if (this._options.clientNoContextTakeover) { + params.client_no_context_takeover = true; + } + if (this._options.serverMaxWindowBits) { + params.server_max_window_bits = this._options.serverMaxWindowBits; + } + if (this._options.clientMaxWindowBits) { + params.client_max_window_bits = this._options.clientMaxWindowBits; + } else if (this._options.clientMaxWindowBits == null) { + params.client_max_window_bits = true; + } + + return params; + } + + /** + * Accept an extension negotiation offer/response. + * + * @param {Array} configurations The extension negotiation offers/reponse + * @return {Object} Accepted configuration + * @public + */ + accept(configurations) { + configurations = this.normalizeParams(configurations); + + this.params = this._isServer + ? this.acceptAsServer(configurations) + : this.acceptAsClient(configurations); + + return this.params; + } + + /** + * Releases all resources used by the extension. + * + * @public + */ + cleanup() { + if (this._inflate) { + this._inflate.close(); + this._inflate = null; + } + + if (this._deflate) { + const callback = this._deflate[kCallback]; + + this._deflate.close(); + this._deflate = null; + + if (callback) { + callback( + new Error( + 'The deflate stream was closed while data was being processed' + ) + ); + } + } + } + + /** + * Accept an extension negotiation offer. + * + * @param {Array} offers The extension negotiation offers + * @return {Object} Accepted configuration + * @private + */ + acceptAsServer(offers) { + const opts = this._options; + const accepted = offers.find((params) => { + if ( + (opts.serverNoContextTakeover === false && + params.server_no_context_takeover) || + (params.server_max_window_bits && + (opts.serverMaxWindowBits === false || + (typeof opts.serverMaxWindowBits === 'number' && + opts.serverMaxWindowBits > params.server_max_window_bits))) || + (typeof opts.clientMaxWindowBits === 'number' && + !params.client_max_window_bits) + ) { + return false; + } + + return true; + }); + + if (!accepted) { + throw new Error('None of the extension offers can be accepted'); + } + + if (opts.serverNoContextTakeover) { + accepted.server_no_context_takeover = true; + } + if (opts.clientNoContextTakeover) { + accepted.client_no_context_takeover = true; + } + if (typeof opts.serverMaxWindowBits === 'number') { + accepted.server_max_window_bits = opts.serverMaxWindowBits; + } + if (typeof opts.clientMaxWindowBits === 'number') { + accepted.client_max_window_bits = opts.clientMaxWindowBits; + } else if ( + accepted.client_max_window_bits === true || + opts.clientMaxWindowBits === false + ) { + delete accepted.client_max_window_bits; + } + + return accepted; + } + + /** + * Accept the extension negotiation response. + * + * @param {Array} response The extension negotiation response + * @return {Object} Accepted configuration + * @private + */ + acceptAsClient(response) { + const params = response[0]; + + if ( + this._options.clientNoContextTakeover === false && + params.client_no_context_takeover + ) { + throw new Error('Unexpected parameter "client_no_context_takeover"'); + } + + if (!params.client_max_window_bits) { + if (typeof this._options.clientMaxWindowBits === 'number') { + params.client_max_window_bits = this._options.clientMaxWindowBits; + } + } else if ( + this._options.clientMaxWindowBits === false || + (typeof this._options.clientMaxWindowBits === 'number' && + params.client_max_window_bits > this._options.clientMaxWindowBits) + ) { + throw new Error( + 'Unexpected or invalid parameter "client_max_window_bits"' + ); + } + + return params; + } + + /** + * Normalize parameters. + * + * @param {Array} configurations The extension negotiation offers/reponse + * @return {Array} The offers/response with normalized parameters + * @private + */ + normalizeParams(configurations) { + configurations.forEach((params) => { + Object.keys(params).forEach((key) => { + let value = params[key]; + + if (value.length > 1) { + throw new Error(`Parameter "${key}" must have only a single value`); + } + + value = value[0]; + + if (key === 'client_max_window_bits') { + if (value !== true) { + const num = +value; + if (!Number.isInteger(num) || num < 8 || num > 15) { + throw new TypeError( + `Invalid value for parameter "${key}": ${value}` + ); + } + value = num; + } else if (!this._isServer) { + throw new TypeError( + `Invalid value for parameter "${key}": ${value}` + ); + } + } else if (key === 'server_max_window_bits') { + const num = +value; + if (!Number.isInteger(num) || num < 8 || num > 15) { + throw new TypeError( + `Invalid value for parameter "${key}": ${value}` + ); + } + value = num; + } else if ( + key === 'client_no_context_takeover' || + key === 'server_no_context_takeover' + ) { + if (value !== true) { + throw new TypeError( + `Invalid value for parameter "${key}": ${value}` + ); + } + } else { + throw new Error(`Unknown parameter "${key}"`); + } + + params[key] = value; + }); + }); + + return configurations; + } + + /** + * Decompress data. Concurrency limited. + * + * @param {Buffer} data Compressed data + * @param {Boolean} fin Specifies whether or not this is the last fragment + * @param {Function} callback Callback + * @public + */ + decompress(data, fin, callback) { + zlibLimiter.add((done) => { + this._decompress(data, fin, (err, result) => { + done(); + callback(err, result); + }); + }); + } + + /** + * Compress data. Concurrency limited. + * + * @param {Buffer} data Data to compress + * @param {Boolean} fin Specifies whether or not this is the last fragment + * @param {Function} callback Callback + * @public + */ + compress(data, fin, callback) { + zlibLimiter.add((done) => { + this._compress(data, fin, (err, result) => { + done(); + callback(err, result); + }); + }); + } + + /** + * Decompress data. + * + * @param {Buffer} data Compressed data + * @param {Boolean} fin Specifies whether or not this is the last fragment + * @param {Function} callback Callback + * @private + */ + _decompress(data, fin, callback) { + const endpoint = this._isServer ? 'client' : 'server'; + + if (!this._inflate) { + const key = `${endpoint}_max_window_bits`; + const windowBits = + typeof this.params[key] !== 'number' + ? zlib.Z_DEFAULT_WINDOWBITS + : this.params[key]; + + this._inflate = zlib.createInflateRaw({ + ...this._options.zlibInflateOptions, + windowBits + }); + this._inflate[kPerMessageDeflate] = this; + this._inflate[kTotalLength] = 0; + this._inflate[kBuffers] = []; + this._inflate.on('error', inflateOnError); + this._inflate.on('data', inflateOnData); + } + + this._inflate[kCallback] = callback; + + this._inflate.write(data); + if (fin) this._inflate.write(TRAILER); + + this._inflate.flush(() => { + const err = this._inflate[kError]; + + if (err) { + this._inflate.close(); + this._inflate = null; + callback(err); + return; + } + + const data = bufferUtil.concat( + this._inflate[kBuffers], + this._inflate[kTotalLength] + ); + + if (this._inflate._readableState.endEmitted) { + this._inflate.close(); + this._inflate = null; + } else { + this._inflate[kTotalLength] = 0; + this._inflate[kBuffers] = []; + + if (fin && this.params[`${endpoint}_no_context_takeover`]) { + this._inflate.reset(); + } + } + + callback(null, data); + }); + } + + /** + * Compress data. + * + * @param {Buffer} data Data to compress + * @param {Boolean} fin Specifies whether or not this is the last fragment + * @param {Function} callback Callback + * @private + */ + _compress(data, fin, callback) { + const endpoint = this._isServer ? 'server' : 'client'; + + if (!this._deflate) { + const key = `${endpoint}_max_window_bits`; + const windowBits = + typeof this.params[key] !== 'number' + ? zlib.Z_DEFAULT_WINDOWBITS + : this.params[key]; + + this._deflate = zlib.createDeflateRaw({ + ...this._options.zlibDeflateOptions, + windowBits + }); + + this._deflate[kTotalLength] = 0; + this._deflate[kBuffers] = []; + + // + // An `'error'` event is emitted, only on Node.js < 10.0.0, if the + // `zlib.DeflateRaw` instance is closed while data is being processed. + // This can happen if `PerMessageDeflate#cleanup()` is called at the wrong + // time due to an abnormal WebSocket closure. + // + this._deflate.on('error', NOOP); + this._deflate.on('data', deflateOnData); + } + + this._deflate[kCallback] = callback; + + this._deflate.write(data); + this._deflate.flush(zlib.Z_SYNC_FLUSH, () => { + if (!this._deflate) { + // + // The deflate stream was closed while data was being processed. + // + return; + } + + let data = bufferUtil.concat( + this._deflate[kBuffers], + this._deflate[kTotalLength] + ); + + if (fin) data = data.slice(0, data.length - 4); + + // + // Ensure that the callback will not be called again in + // `PerMessageDeflate#cleanup()`. + // + this._deflate[kCallback] = null; + + this._deflate[kTotalLength] = 0; + this._deflate[kBuffers] = []; + + if (fin && this.params[`${endpoint}_no_context_takeover`]) { + this._deflate.reset(); + } + + callback(null, data); + }); + } +} + +module.exports = PerMessageDeflate; + +/** + * The listener of the `zlib.DeflateRaw` stream `'data'` event. + * + * @param {Buffer} chunk A chunk of data + * @private + */ +function deflateOnData(chunk) { + this[kBuffers].push(chunk); + this[kTotalLength] += chunk.length; +} + +/** + * The listener of the `zlib.InflateRaw` stream `'data'` event. + * + * @param {Buffer} chunk A chunk of data + * @private + */ +function inflateOnData(chunk) { + this[kTotalLength] += chunk.length; + + if ( + this[kPerMessageDeflate]._maxPayload < 1 || + this[kTotalLength] <= this[kPerMessageDeflate]._maxPayload + ) { + this[kBuffers].push(chunk); + return; + } + + this[kError] = new RangeError('Max payload size exceeded'); + this[kError].code = 'WS_ERR_UNSUPPORTED_MESSAGE_LENGTH'; + this[kError][kStatusCode] = 1009; + this.removeListener('data', inflateOnData); + this.reset(); +} + +/** + * The listener of the `zlib.InflateRaw` stream `'error'` event. + * + * @param {Error} err The emitted error + * @private + */ +function inflateOnError(err) { + // + // There is no need to call `Zlib#close()` as the handle is automatically + // closed when an error is emitted. + // + this[kPerMessageDeflate]._inflate = null; + err[kStatusCode] = 1007; + this[kCallback](err); +} Index: frontend/node_modules/ws/lib/receiver.js =================================================================== --- frontend/node_modules/ws/lib/receiver.js (revision 9af201e94b5a79beb92a30858fc54de4bc3b9449) +++ frontend/node_modules/ws/lib/receiver.js (revision 9af201e94b5a79beb92a30858fc54de4bc3b9449) @@ -0,0 +1,607 @@ +'use strict'; + +const { Writable } = require('stream'); + +const PerMessageDeflate = require('./permessage-deflate'); +const { + BINARY_TYPES, + EMPTY_BUFFER, + kStatusCode, + kWebSocket +} = require('./constants'); +const { concat, toArrayBuffer, unmask } = require('./buffer-util'); +const { isValidStatusCode, isValidUTF8 } = require('./validation'); + +const GET_INFO = 0; +const GET_PAYLOAD_LENGTH_16 = 1; +const GET_PAYLOAD_LENGTH_64 = 2; +const GET_MASK = 3; +const GET_DATA = 4; +const INFLATING = 5; + +/** + * HyBi Receiver implementation. + * + * @extends Writable + */ +class Receiver extends Writable { + /** + * Creates a Receiver instance. + * + * @param {String} [binaryType=nodebuffer] The type for binary data + * @param {Object} [extensions] An object containing the negotiated extensions + * @param {Boolean} [isServer=false] Specifies whether to operate in client or + * server mode + * @param {Number} [maxPayload=0] The maximum allowed message length + */ + constructor(binaryType, extensions, isServer, maxPayload) { + super(); + + this._binaryType = binaryType || BINARY_TYPES[0]; + this[kWebSocket] = undefined; + this._extensions = extensions || {}; + this._isServer = !!isServer; + this._maxPayload = maxPayload | 0; + + this._bufferedBytes = 0; + this._buffers = []; + + this._compressed = false; + this._payloadLength = 0; + this._mask = undefined; + this._fragmented = 0; + this._masked = false; + this._fin = false; + this._opcode = 0; + + this._totalPayloadLength = 0; + this._messageLength = 0; + this._fragments = []; + + this._state = GET_INFO; + this._loop = false; + } + + /** + * Implements `Writable.prototype._write()`. + * + * @param {Buffer} chunk The chunk of data to write + * @param {String} encoding The character encoding of `chunk` + * @param {Function} cb Callback + * @private + */ + _write(chunk, encoding, cb) { + if (this._opcode === 0x08 && this._state == GET_INFO) return cb(); + + this._bufferedBytes += chunk.length; + this._buffers.push(chunk); + this.startLoop(cb); + } + + /** + * Consumes `n` bytes from the buffered data. + * + * @param {Number} n The number of bytes to consume + * @return {Buffer} The consumed bytes + * @private + */ + consume(n) { + this._bufferedBytes -= n; + + if (n === this._buffers[0].length) return this._buffers.shift(); + + if (n < this._buffers[0].length) { + const buf = this._buffers[0]; + this._buffers[0] = buf.slice(n); + return buf.slice(0, n); + } + + const dst = Buffer.allocUnsafe(n); + + do { + const buf = this._buffers[0]; + const offset = dst.length - n; + + if (n >= buf.length) { + dst.set(this._buffers.shift(), offset); + } else { + dst.set(new Uint8Array(buf.buffer, buf.byteOffset, n), offset); + this._buffers[0] = buf.slice(n); + } + + n -= buf.length; + } while (n > 0); + + return dst; + } + + /** + * Starts the parsing loop. + * + * @param {Function} cb Callback + * @private + */ + startLoop(cb) { + let err; + this._loop = true; + + do { + switch (this._state) { + case GET_INFO: + err = this.getInfo(); + break; + case GET_PAYLOAD_LENGTH_16: + err = this.getPayloadLength16(); + break; + case GET_PAYLOAD_LENGTH_64: + err = this.getPayloadLength64(); + break; + case GET_MASK: + this.getMask(); + break; + case GET_DATA: + err = this.getData(cb); + break; + default: + // `INFLATING` + this._loop = false; + return; + } + } while (this._loop); + + cb(err); + } + + /** + * Reads the first two bytes of a frame. + * + * @return {(RangeError|undefined)} A possible error + * @private + */ + getInfo() { + if (this._bufferedBytes < 2) { + this._loop = false; + return; + } + + const buf = this.consume(2); + + if ((buf[0] & 0x30) !== 0x00) { + this._loop = false; + return error( + RangeError, + 'RSV2 and RSV3 must be clear', + true, + 1002, + 'WS_ERR_UNEXPECTED_RSV_2_3' + ); + } + + const compressed = (buf[0] & 0x40) === 0x40; + + if (compressed && !this._extensions[PerMessageDeflate.extensionName]) { + this._loop = false; + return error( + RangeError, + 'RSV1 must be clear', + true, + 1002, + 'WS_ERR_UNEXPECTED_RSV_1' + ); + } + + this._fin = (buf[0] & 0x80) === 0x80; + this._opcode = buf[0] & 0x0f; + this._payloadLength = buf[1] & 0x7f; + + if (this._opcode === 0x00) { + if (compressed) { + this._loop = false; + return error( + RangeError, + 'RSV1 must be clear', + true, + 1002, + 'WS_ERR_UNEXPECTED_RSV_1' + ); + } + + if (!this._fragmented) { + this._loop = false; + return error( + RangeError, + 'invalid opcode 0', + true, + 1002, + 'WS_ERR_INVALID_OPCODE' + ); + } + + this._opcode = this._fragmented; + } else if (this._opcode === 0x01 || this._opcode === 0x02) { + if (this._fragmented) { + this._loop = false; + return error( + RangeError, + `invalid opcode ${this._opcode}`, + true, + 1002, + 'WS_ERR_INVALID_OPCODE' + ); + } + + this._compressed = compressed; + } else if (this._opcode > 0x07 && this._opcode < 0x0b) { + if (!this._fin) { + this._loop = false; + return error( + RangeError, + 'FIN must be set', + true, + 1002, + 'WS_ERR_EXPECTED_FIN' + ); + } + + if (compressed) { + this._loop = false; + return error( + RangeError, + 'RSV1 must be clear', + true, + 1002, + 'WS_ERR_UNEXPECTED_RSV_1' + ); + } + + if (this._payloadLength > 0x7d) { + this._loop = false; + return error( + RangeError, + `invalid payload length ${this._payloadLength}`, + true, + 1002, + 'WS_ERR_INVALID_CONTROL_PAYLOAD_LENGTH' + ); + } + } else { + this._loop = false; + return error( + RangeError, + `invalid opcode ${this._opcode}`, + true, + 1002, + 'WS_ERR_INVALID_OPCODE' + ); + } + + if (!this._fin && !this._fragmented) this._fragmented = this._opcode; + this._masked = (buf[1] & 0x80) === 0x80; + + if (this._isServer) { + if (!this._masked) { + this._loop = false; + return error( + RangeError, + 'MASK must be set', + true, + 1002, + 'WS_ERR_EXPECTED_MASK' + ); + } + } else if (this._masked) { + this._loop = false; + return error( + RangeError, + 'MASK must be clear', + true, + 1002, + 'WS_ERR_UNEXPECTED_MASK' + ); + } + + if (this._payloadLength === 126) this._state = GET_PAYLOAD_LENGTH_16; + else if (this._payloadLength === 127) this._state = GET_PAYLOAD_LENGTH_64; + else return this.haveLength(); + } + + /** + * Gets extended payload length (7+16). + * + * @return {(RangeError|undefined)} A possible error + * @private + */ + getPayloadLength16() { + if (this._bufferedBytes < 2) { + this._loop = false; + return; + } + + this._payloadLength = this.consume(2).readUInt16BE(0); + return this.haveLength(); + } + + /** + * Gets extended payload length (7+64). + * + * @return {(RangeError|undefined)} A possible error + * @private + */ + getPayloadLength64() { + if (this._bufferedBytes < 8) { + this._loop = false; + return; + } + + const buf = this.consume(8); + const num = buf.readUInt32BE(0); + + // + // The maximum safe integer in JavaScript is 2^53 - 1. An error is returned + // if payload length is greater than this number. + // + if (num > Math.pow(2, 53 - 32) - 1) { + this._loop = false; + return error( + RangeError, + 'Unsupported WebSocket frame: payload length > 2^53 - 1', + false, + 1009, + 'WS_ERR_UNSUPPORTED_DATA_PAYLOAD_LENGTH' + ); + } + + this._payloadLength = num * Math.pow(2, 32) + buf.readUInt32BE(4); + return this.haveLength(); + } + + /** + * Payload length has been read. + * + * @return {(RangeError|undefined)} A possible error + * @private + */ + haveLength() { + if (this._payloadLength && this._opcode < 0x08) { + this._totalPayloadLength += this._payloadLength; + if (this._totalPayloadLength > this._maxPayload && this._maxPayload > 0) { + this._loop = false; + return error( + RangeError, + 'Max payload size exceeded', + false, + 1009, + 'WS_ERR_UNSUPPORTED_MESSAGE_LENGTH' + ); + } + } + + if (this._masked) this._state = GET_MASK; + else this._state = GET_DATA; + } + + /** + * Reads mask bytes. + * + * @private + */ + getMask() { + if (this._bufferedBytes < 4) { + this._loop = false; + return; + } + + this._mask = this.consume(4); + this._state = GET_DATA; + } + + /** + * Reads data bytes. + * + * @param {Function} cb Callback + * @return {(Error|RangeError|undefined)} A possible error + * @private + */ + getData(cb) { + let data = EMPTY_BUFFER; + + if (this._payloadLength) { + if (this._bufferedBytes < this._payloadLength) { + this._loop = false; + return; + } + + data = this.consume(this._payloadLength); + if (this._masked) unmask(data, this._mask); + } + + if (this._opcode > 0x07) return this.controlMessage(data); + + if (this._compressed) { + this._state = INFLATING; + this.decompress(data, cb); + return; + } + + if (data.length) { + // + // This message is not compressed so its lenght is the sum of the payload + // length of all fragments. + // + this._messageLength = this._totalPayloadLength; + this._fragments.push(data); + } + + return this.dataMessage(); + } + + /** + * Decompresses data. + * + * @param {Buffer} data Compressed data + * @param {Function} cb Callback + * @private + */ + decompress(data, cb) { + const perMessageDeflate = this._extensions[PerMessageDeflate.extensionName]; + + perMessageDeflate.decompress(data, this._fin, (err, buf) => { + if (err) return cb(err); + + if (buf.length) { + this._messageLength += buf.length; + if (this._messageLength > this._maxPayload && this._maxPayload > 0) { + return cb( + error( + RangeError, + 'Max payload size exceeded', + false, + 1009, + 'WS_ERR_UNSUPPORTED_MESSAGE_LENGTH' + ) + ); + } + + this._fragments.push(buf); + } + + const er = this.dataMessage(); + if (er) return cb(er); + + this.startLoop(cb); + }); + } + + /** + * Handles a data message. + * + * @return {(Error|undefined)} A possible error + * @private + */ + dataMessage() { + if (this._fin) { + const messageLength = this._messageLength; + const fragments = this._fragments; + + this._totalPayloadLength = 0; + this._messageLength = 0; + this._fragmented = 0; + this._fragments = []; + + if (this._opcode === 2) { + let data; + + if (this._binaryType === 'nodebuffer') { + data = concat(fragments, messageLength); + } else if (this._binaryType === 'arraybuffer') { + data = toArrayBuffer(concat(fragments, messageLength)); + } else { + data = fragments; + } + + this.emit('message', data); + } else { + const buf = concat(fragments, messageLength); + + if (!isValidUTF8(buf)) { + this._loop = false; + return error( + Error, + 'invalid UTF-8 sequence', + true, + 1007, + 'WS_ERR_INVALID_UTF8' + ); + } + + this.emit('message', buf.toString()); + } + } + + this._state = GET_INFO; + } + + /** + * Handles a control message. + * + * @param {Buffer} data Data to handle + * @return {(Error|RangeError|undefined)} A possible error + * @private + */ + controlMessage(data) { + if (this._opcode === 0x08) { + this._loop = false; + + if (data.length === 0) { + this.emit('conclude', 1005, ''); + this.end(); + } else if (data.length === 1) { + return error( + RangeError, + 'invalid payload length 1', + true, + 1002, + 'WS_ERR_INVALID_CONTROL_PAYLOAD_LENGTH' + ); + } else { + const code = data.readUInt16BE(0); + + if (!isValidStatusCode(code)) { + return error( + RangeError, + `invalid status code ${code}`, + true, + 1002, + 'WS_ERR_INVALID_CLOSE_CODE' + ); + } + + const buf = data.slice(2); + + if (!isValidUTF8(buf)) { + return error( + Error, + 'invalid UTF-8 sequence', + true, + 1007, + 'WS_ERR_INVALID_UTF8' + ); + } + + this.emit('conclude', code, buf.toString()); + this.end(); + } + } else if (this._opcode === 0x09) { + this.emit('ping', data); + } else { + this.emit('pong', data); + } + + this._state = GET_INFO; + } +} + +module.exports = Receiver; + +/** + * Builds an error object. + * + * @param {function(new:Error|RangeError)} ErrorCtor The error constructor + * @param {String} message The error message + * @param {Boolean} prefix Specifies whether or not to add a default prefix to + * `message` + * @param {Number} statusCode The status code + * @param {String} errorCode The exposed error code + * @return {(Error|RangeError)} The error + * @private + */ +function error(ErrorCtor, message, prefix, statusCode, errorCode) { + const err = new ErrorCtor( + prefix ? `Invalid WebSocket frame: ${message}` : message + ); + + Error.captureStackTrace(err, error); + err.code = errorCode; + err[kStatusCode] = statusCode; + return err; +} Index: frontend/node_modules/ws/lib/sender.js =================================================================== --- frontend/node_modules/ws/lib/sender.js (revision 9af201e94b5a79beb92a30858fc54de4bc3b9449) +++ frontend/node_modules/ws/lib/sender.js (revision 9af201e94b5a79beb92a30858fc54de4bc3b9449) @@ -0,0 +1,409 @@ +/* eslint no-unused-vars: ["error", { "varsIgnorePattern": "^net|tls$" }] */ + +'use strict'; + +const net = require('net'); +const tls = require('tls'); +const { randomFillSync } = require('crypto'); + +const PerMessageDeflate = require('./permessage-deflate'); +const { EMPTY_BUFFER } = require('./constants'); +const { isValidStatusCode } = require('./validation'); +const { mask: applyMask, toBuffer } = require('./buffer-util'); + +const mask = Buffer.alloc(4); + +/** + * HyBi Sender implementation. + */ +class Sender { + /** + * Creates a Sender instance. + * + * @param {(net.Socket|tls.Socket)} socket The connection socket + * @param {Object} [extensions] An object containing the negotiated extensions + */ + constructor(socket, extensions) { + this._extensions = extensions || {}; + this._socket = socket; + + this._firstFragment = true; + this._compress = false; + + this._bufferedBytes = 0; + this._deflating = false; + this._queue = []; + } + + /** + * Frames a piece of data according to the HyBi WebSocket protocol. + * + * @param {Buffer} data The data to frame + * @param {Object} options Options object + * @param {Number} options.opcode The opcode + * @param {Boolean} [options.readOnly=false] Specifies whether `data` can be + * modified + * @param {Boolean} [options.fin=false] Specifies whether or not to set the + * FIN bit + * @param {Boolean} [options.mask=false] Specifies whether or not to mask + * `data` + * @param {Boolean} [options.rsv1=false] Specifies whether or not to set the + * RSV1 bit + * @return {Buffer[]} The framed data as a list of `Buffer` instances + * @public + */ + static frame(data, options) { + const merge = options.mask && options.readOnly; + let offset = options.mask ? 6 : 2; + let payloadLength = data.length; + + if (data.length >= 65536) { + offset += 8; + payloadLength = 127; + } else if (data.length > 125) { + offset += 2; + payloadLength = 126; + } + + const target = Buffer.allocUnsafe(merge ? data.length + offset : offset); + + target[0] = options.fin ? options.opcode | 0x80 : options.opcode; + if (options.rsv1) target[0] |= 0x40; + + target[1] = payloadLength; + + if (payloadLength === 126) { + target.writeUInt16BE(data.length, 2); + } else if (payloadLength === 127) { + target.writeUInt32BE(0, 2); + target.writeUInt32BE(data.length, 6); + } + + if (!options.mask) return [target, data]; + + randomFillSync(mask, 0, 4); + + target[1] |= 0x80; + target[offset - 4] = mask[0]; + target[offset - 3] = mask[1]; + target[offset - 2] = mask[2]; + target[offset - 1] = mask[3]; + + if (merge) { + applyMask(data, mask, target, offset, data.length); + return [target]; + } + + applyMask(data, mask, data, 0, data.length); + return [target, data]; + } + + /** + * Sends a close message to the other peer. + * + * @param {Number} [code] The status code component of the body + * @param {String} [data] The message component of the body + * @param {Boolean} [mask=false] Specifies whether or not to mask the message + * @param {Function} [cb] Callback + * @public + */ + close(code, data, mask, cb) { + let buf; + + if (code === undefined) { + buf = EMPTY_BUFFER; + } else if (typeof code !== 'number' || !isValidStatusCode(code)) { + throw new TypeError('First argument must be a valid error code number'); + } else if (data === undefined || data === '') { + buf = Buffer.allocUnsafe(2); + buf.writeUInt16BE(code, 0); + } else { + const length = Buffer.byteLength(data); + + if (length > 123) { + throw new RangeError('The message must not be greater than 123 bytes'); + } + + buf = Buffer.allocUnsafe(2 + length); + buf.writeUInt16BE(code, 0); + buf.write(data, 2); + } + + if (this._deflating) { + this.enqueue([this.doClose, buf, mask, cb]); + } else { + this.doClose(buf, mask, cb); + } + } + + /** + * Frames and sends a close message. + * + * @param {Buffer} data The message to send + * @param {Boolean} [mask=false] Specifies whether or not to mask `data` + * @param {Function} [cb] Callback + * @private + */ + doClose(data, mask, cb) { + this.sendFrame( + Sender.frame(data, { + fin: true, + rsv1: false, + opcode: 0x08, + mask, + readOnly: false + }), + cb + ); + } + + /** + * Sends a ping message to the other peer. + * + * @param {*} data The message to send + * @param {Boolean} [mask=false] Specifies whether or not to mask `data` + * @param {Function} [cb] Callback + * @public + */ + ping(data, mask, cb) { + const buf = toBuffer(data); + + if (buf.length > 125) { + throw new RangeError('The data size must not be greater than 125 bytes'); + } + + if (this._deflating) { + this.enqueue([this.doPing, buf, mask, toBuffer.readOnly, cb]); + } else { + this.doPing(buf, mask, toBuffer.readOnly, cb); + } + } + + /** + * Frames and sends a ping message. + * + * @param {Buffer} data The message to send + * @param {Boolean} [mask=false] Specifies whether or not to mask `data` + * @param {Boolean} [readOnly=false] Specifies whether `data` can be modified + * @param {Function} [cb] Callback + * @private + */ + doPing(data, mask, readOnly, cb) { + this.sendFrame( + Sender.frame(data, { + fin: true, + rsv1: false, + opcode: 0x09, + mask, + readOnly + }), + cb + ); + } + + /** + * Sends a pong message to the other peer. + * + * @param {*} data The message to send + * @param {Boolean} [mask=false] Specifies whether or not to mask `data` + * @param {Function} [cb] Callback + * @public + */ + pong(data, mask, cb) { + const buf = toBuffer(data); + + if (buf.length > 125) { + throw new RangeError('The data size must not be greater than 125 bytes'); + } + + if (this._deflating) { + this.enqueue([this.doPong, buf, mask, toBuffer.readOnly, cb]); + } else { + this.doPong(buf, mask, toBuffer.readOnly, cb); + } + } + + /** + * Frames and sends a pong message. + * + * @param {Buffer} data The message to send + * @param {Boolean} [mask=false] Specifies whether or not to mask `data` + * @param {Boolean} [readOnly=false] Specifies whether `data` can be modified + * @param {Function} [cb] Callback + * @private + */ + doPong(data, mask, readOnly, cb) { + this.sendFrame( + Sender.frame(data, { + fin: true, + rsv1: false, + opcode: 0x0a, + mask, + readOnly + }), + cb + ); + } + + /** + * Sends a data message to the other peer. + * + * @param {*} data The message to send + * @param {Object} options Options object + * @param {Boolean} [options.compress=false] Specifies whether or not to + * compress `data` + * @param {Boolean} [options.binary=false] Specifies whether `data` is binary + * or text + * @param {Boolean} [options.fin=false] Specifies whether the fragment is the + * last one + * @param {Boolean} [options.mask=false] Specifies whether or not to mask + * `data` + * @param {Function} [cb] Callback + * @public + */ + send(data, options, cb) { + const buf = toBuffer(data); + const perMessageDeflate = this._extensions[PerMessageDeflate.extensionName]; + let opcode = options.binary ? 2 : 1; + let rsv1 = options.compress; + + if (this._firstFragment) { + this._firstFragment = false; + if (rsv1 && perMessageDeflate) { + rsv1 = buf.length >= perMessageDeflate._threshold; + } + this._compress = rsv1; + } else { + rsv1 = false; + opcode = 0; + } + + if (options.fin) this._firstFragment = true; + + if (perMessageDeflate) { + const opts = { + fin: options.fin, + rsv1, + opcode, + mask: options.mask, + readOnly: toBuffer.readOnly + }; + + if (this._deflating) { + this.enqueue([this.dispatch, buf, this._compress, opts, cb]); + } else { + this.dispatch(buf, this._compress, opts, cb); + } + } else { + this.sendFrame( + Sender.frame(buf, { + fin: options.fin, + rsv1: false, + opcode, + mask: options.mask, + readOnly: toBuffer.readOnly + }), + cb + ); + } + } + + /** + * Dispatches a data message. + * + * @param {Buffer} data The message to send + * @param {Boolean} [compress=false] Specifies whether or not to compress + * `data` + * @param {Object} options Options object + * @param {Number} options.opcode The opcode + * @param {Boolean} [options.readOnly=false] Specifies whether `data` can be + * modified + * @param {Boolean} [options.fin=false] Specifies whether or not to set the + * FIN bit + * @param {Boolean} [options.mask=false] Specifies whether or not to mask + * `data` + * @param {Boolean} [options.rsv1=false] Specifies whether or not to set the + * RSV1 bit + * @param {Function} [cb] Callback + * @private + */ + dispatch(data, compress, options, cb) { + if (!compress) { + this.sendFrame(Sender.frame(data, options), cb); + return; + } + + const perMessageDeflate = this._extensions[PerMessageDeflate.extensionName]; + + this._bufferedBytes += data.length; + this._deflating = true; + perMessageDeflate.compress(data, options.fin, (_, buf) => { + if (this._socket.destroyed) { + const err = new Error( + 'The socket was closed while data was being compressed' + ); + + if (typeof cb === 'function') cb(err); + + for (let i = 0; i < this._queue.length; i++) { + const callback = this._queue[i][4]; + + if (typeof callback === 'function') callback(err); + } + + return; + } + + this._bufferedBytes -= data.length; + this._deflating = false; + options.readOnly = false; + this.sendFrame(Sender.frame(buf, options), cb); + this.dequeue(); + }); + } + + /** + * Executes queued send operations. + * + * @private + */ + dequeue() { + while (!this._deflating && this._queue.length) { + const params = this._queue.shift(); + + this._bufferedBytes -= params[1].length; + Reflect.apply(params[0], this, params.slice(1)); + } + } + + /** + * Enqueues a send operation. + * + * @param {Array} params Send operation parameters. + * @private + */ + enqueue(params) { + this._bufferedBytes += params[1].length; + this._queue.push(params); + } + + /** + * Sends a frame. + * + * @param {Buffer[]} list The frame to send + * @param {Function} [cb] Callback + * @private + */ + sendFrame(list, cb) { + if (list.length === 2) { + this._socket.cork(); + this._socket.write(list[0]); + this._socket.write(list[1], cb); + this._socket.uncork(); + } else { + this._socket.write(list[0], cb); + } + } +} + +module.exports = Sender; Index: frontend/node_modules/ws/lib/stream.js =================================================================== --- frontend/node_modules/ws/lib/stream.js (revision 9af201e94b5a79beb92a30858fc54de4bc3b9449) +++ frontend/node_modules/ws/lib/stream.js (revision 9af201e94b5a79beb92a30858fc54de4bc3b9449) @@ -0,0 +1,180 @@ +'use strict'; + +const { Duplex } = require('stream'); + +/** + * Emits the `'close'` event on a stream. + * + * @param {Duplex} stream The stream. + * @private + */ +function emitClose(stream) { + stream.emit('close'); +} + +/** + * The listener of the `'end'` event. + * + * @private + */ +function duplexOnEnd() { + if (!this.destroyed && this._writableState.finished) { + this.destroy(); + } +} + +/** + * The listener of the `'error'` event. + * + * @param {Error} err The error + * @private + */ +function duplexOnError(err) { + this.removeListener('error', duplexOnError); + this.destroy(); + if (this.listenerCount('error') === 0) { + // Do not suppress the throwing behavior. + this.emit('error', err); + } +} + +/** + * Wraps a `WebSocket` in a duplex stream. + * + * @param {WebSocket} ws The `WebSocket` to wrap + * @param {Object} [options] The options for the `Duplex` constructor + * @return {Duplex} The duplex stream + * @public + */ +function createWebSocketStream(ws, options) { + let resumeOnReceiverDrain = true; + let terminateOnDestroy = true; + + function receiverOnDrain() { + if (resumeOnReceiverDrain) ws._socket.resume(); + } + + if (ws.readyState === ws.CONNECTING) { + ws.once('open', function open() { + ws._receiver.removeAllListeners('drain'); + ws._receiver.on('drain', receiverOnDrain); + }); + } else { + ws._receiver.removeAllListeners('drain'); + ws._receiver.on('drain', receiverOnDrain); + } + + const duplex = new Duplex({ + ...options, + autoDestroy: false, + emitClose: false, + objectMode: false, + writableObjectMode: false + }); + + ws.on('message', function message(msg) { + if (!duplex.push(msg)) { + resumeOnReceiverDrain = false; + ws._socket.pause(); + } + }); + + ws.once('error', function error(err) { + if (duplex.destroyed) return; + + // Prevent `ws.terminate()` from being called by `duplex._destroy()`. + // + // - If the `'error'` event is emitted before the `'open'` event, then + // `ws.terminate()` is a noop as no socket is assigned. + // - Otherwise, the error is re-emitted by the listener of the `'error'` + // event of the `Receiver` object. The listener already closes the + // connection by calling `ws.close()`. This allows a close frame to be + // sent to the other peer. If `ws.terminate()` is called right after this, + // then the close frame might not be sent. + terminateOnDestroy = false; + duplex.destroy(err); + }); + + ws.once('close', function close() { + if (duplex.destroyed) return; + + duplex.push(null); + }); + + duplex._destroy = function (err, callback) { + if (ws.readyState === ws.CLOSED) { + callback(err); + process.nextTick(emitClose, duplex); + return; + } + + let called = false; + + ws.once('error', function error(err) { + called = true; + callback(err); + }); + + ws.once('close', function close() { + if (!called) callback(err); + process.nextTick(emitClose, duplex); + }); + + if (terminateOnDestroy) ws.terminate(); + }; + + duplex._final = function (callback) { + if (ws.readyState === ws.CONNECTING) { + ws.once('open', function open() { + duplex._final(callback); + }); + return; + } + + // If the value of the `_socket` property is `null` it means that `ws` is a + // client websocket and the handshake failed. In fact, when this happens, a + // socket is never assigned to the websocket. Wait for the `'error'` event + // that will be emitted by the websocket. + if (ws._socket === null) return; + + if (ws._socket._writableState.finished) { + callback(); + if (duplex._readableState.endEmitted) duplex.destroy(); + } else { + ws._socket.once('finish', function finish() { + // `duplex` is not destroyed here because the `'end'` event will be + // emitted on `duplex` after this `'finish'` event. The EOF signaling + // `null` chunk is, in fact, pushed when the websocket emits `'close'`. + callback(); + }); + ws.close(); + } + }; + + duplex._read = function () { + if ( + (ws.readyState === ws.OPEN || ws.readyState === ws.CLOSING) && + !resumeOnReceiverDrain + ) { + resumeOnReceiverDrain = true; + if (!ws._receiver._writableState.needDrain) ws._socket.resume(); + } + }; + + duplex._write = function (chunk, encoding, callback) { + if (ws.readyState === ws.CONNECTING) { + ws.once('open', function open() { + duplex._write(chunk, encoding, callback); + }); + return; + } + + ws.send(chunk, callback); + }; + + duplex.on('end', duplexOnEnd); + duplex.on('error', duplexOnError); + return duplex; +} + +module.exports = createWebSocketStream; Index: frontend/node_modules/ws/lib/validation.js =================================================================== --- frontend/node_modules/ws/lib/validation.js (revision 9af201e94b5a79beb92a30858fc54de4bc3b9449) +++ frontend/node_modules/ws/lib/validation.js (revision 9af201e94b5a79beb92a30858fc54de4bc3b9449) @@ -0,0 +1,104 @@ +'use strict'; + +/** + * Checks if a status code is allowed in a close frame. + * + * @param {Number} code The status code + * @return {Boolean} `true` if the status code is valid, else `false` + * @public + */ +function isValidStatusCode(code) { + return ( + (code >= 1000 && + code <= 1014 && + code !== 1004 && + code !== 1005 && + code !== 1006) || + (code >= 3000 && code <= 4999) + ); +} + +/** + * Checks if a given buffer contains only correct UTF-8. + * Ported from https://www.cl.cam.ac.uk/%7Emgk25/ucs/utf8_check.c by + * Markus Kuhn. + * + * @param {Buffer} buf The buffer to check + * @return {Boolean} `true` if `buf` contains only correct UTF-8, else `false` + * @public + */ +function _isValidUTF8(buf) { + const len = buf.length; + let i = 0; + + while (i < len) { + if ((buf[i] & 0x80) === 0) { + // 0xxxxxxx + i++; + } else if ((buf[i] & 0xe0) === 0xc0) { + // 110xxxxx 10xxxxxx + if ( + i + 1 === len || + (buf[i + 1] & 0xc0) !== 0x80 || + (buf[i] & 0xfe) === 0xc0 // Overlong + ) { + return false; + } + + i += 2; + } else if ((buf[i] & 0xf0) === 0xe0) { + // 1110xxxx 10xxxxxx 10xxxxxx + if ( + i + 2 >= len || + (buf[i + 1] & 0xc0) !== 0x80 || + (buf[i + 2] & 0xc0) !== 0x80 || + (buf[i] === 0xe0 && (buf[i + 1] & 0xe0) === 0x80) || // Overlong + (buf[i] === 0xed && (buf[i + 1] & 0xe0) === 0xa0) // Surrogate (U+D800 - U+DFFF) + ) { + return false; + } + + i += 3; + } else if ((buf[i] & 0xf8) === 0xf0) { + // 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx + if ( + i + 3 >= len || + (buf[i + 1] & 0xc0) !== 0x80 || + (buf[i + 2] & 0xc0) !== 0x80 || + (buf[i + 3] & 0xc0) !== 0x80 || + (buf[i] === 0xf0 && (buf[i + 1] & 0xf0) === 0x80) || // Overlong + (buf[i] === 0xf4 && buf[i + 1] > 0x8f) || + buf[i] > 0xf4 // > U+10FFFF + ) { + return false; + } + + i += 4; + } else { + return false; + } + } + + return true; +} + +try { + let isValidUTF8 = require('utf-8-validate'); + + /* istanbul ignore if */ + if (typeof isValidUTF8 === 'object') { + isValidUTF8 = isValidUTF8.Validation.isValidUTF8; // utf-8-validate@<3.0.0 + } + + module.exports = { + isValidStatusCode, + isValidUTF8(buf) { + return buf.length < 150 ? _isValidUTF8(buf) : isValidUTF8(buf); + } + }; +} catch (e) /* istanbul ignore next */ { + module.exports = { + isValidStatusCode, + isValidUTF8: _isValidUTF8 + }; +} Index: frontend/node_modules/ws/lib/websocket-server.js =================================================================== --- frontend/node_modules/ws/lib/websocket-server.js (revision 9af201e94b5a79beb92a30858fc54de4bc3b9449) +++ frontend/node_modules/ws/lib/websocket-server.js (revision 9af201e94b5a79beb92a30858fc54de4bc3b9449) @@ -0,0 +1,449 @@ +/* eslint no-unused-vars: ["error", { "varsIgnorePattern": "^net|tls|https$" }] */ + +'use strict'; + +const EventEmitter = require('events'); +const http = require('http'); +const https = require('https'); +const net = require('net'); +const tls = require('tls'); +const { createHash } = require('crypto'); + +const PerMessageDeflate = require('./permessage-deflate'); +const WebSocket = require('./websocket'); +const { format, parse } = require('./extension'); +const { GUID, kWebSocket } = require('./constants'); + +const keyRegex = /^[+/0-9A-Za-z]{22}==$/; + +const RUNNING = 0; +const CLOSING = 1; +const CLOSED = 2; + +/** + * Class representing a WebSocket server. + * + * @extends EventEmitter + */ +class WebSocketServer extends EventEmitter { + /** + * Create a `WebSocketServer` instance. + * + * @param {Object} options Configuration options + * @param {Number} [options.backlog=511] The maximum length of the queue of + * pending connections + * @param {Boolean} [options.clientTracking=true] Specifies whether or not to + * track clients + * @param {Function} [options.handleProtocols] A hook to handle protocols + * @param {String} [options.host] The hostname where to bind the server + * @param {Number} [options.maxPayload=104857600] The maximum allowed message + * size + * @param {Boolean} [options.noServer=false] Enable no server mode + * @param {String} [options.path] Accept only connections matching this path + * @param {(Boolean|Object)} [options.perMessageDeflate=false] Enable/disable + * permessage-deflate + * @param {Number} [options.port] The port where to bind the server + * @param {(http.Server|https.Server)} [options.server] A pre-created HTTP/S + * server to use + * @param {Function} [options.verifyClient] A hook to reject connections + * @param {Function} [callback] A listener for the `listening` event + */ + constructor(options, callback) { + super(); + + options = { + maxPayload: 100 * 1024 * 1024, + perMessageDeflate: false, + handleProtocols: null, + clientTracking: true, + verifyClient: null, + noServer: false, + backlog: null, // use default (511 as implemented in net.js) + server: null, + host: null, + path: null, + port: null, + ...options + }; + + if ( + (options.port == null && !options.server && !options.noServer) || + (options.port != null && (options.server || options.noServer)) || + (options.server && options.noServer) + ) { + throw new TypeError( + 'One and only one of the "port", "server", or "noServer" options ' + + 'must be specified' + ); + } + + if (options.port != null) { + this._server = http.createServer((req, res) => { + const body = http.STATUS_CODES[426]; + + res.writeHead(426, { + 'Content-Length': body.length, + 'Content-Type': 'text/plain' + }); + res.end(body); + }); + this._server.listen( + options.port, + options.host, + options.backlog, + callback + ); + } else if (options.server) { + this._server = options.server; + } + + if (this._server) { + const emitConnection = this.emit.bind(this, 'connection'); + + this._removeListeners = addListeners(this._server, { + listening: this.emit.bind(this, 'listening'), + error: this.emit.bind(this, 'error'), + upgrade: (req, socket, head) => { + this.handleUpgrade(req, socket, head, emitConnection); + } + }); + } + + if (options.perMessageDeflate === true) options.perMessageDeflate = {}; + if (options.clientTracking) this.clients = new Set(); + this.options = options; + this._state = RUNNING; + } + + /** + * Returns the bound address, the address family name, and port of the server + * as reported by the operating system if listening on an IP socket. + * If the server is listening on a pipe or UNIX domain socket, the name is + * returned as a string. + * + * @return {(Object|String|null)} The address of the server + * @public + */ + address() { + if (this.options.noServer) { + throw new Error('The server is operating in "noServer" mode'); + } + + if (!this._server) return null; + return this._server.address(); + } + + /** + * Close the server. + * + * @param {Function} [cb] Callback + * @public + */ + close(cb) { + if (cb) this.once('close', cb); + + if (this._state === CLOSED) { + process.nextTick(emitClose, this); + return; + } + + if (this._state === CLOSING) return; + this._state = CLOSING; + + // + // Terminate all associated clients. + // + if (this.clients) { + for (const client of this.clients) client.terminate(); + } + + const server = this._server; + + if (server) { + this._removeListeners(); + this._removeListeners = this._server = null; + + // + // Close the http server if it was internally created. + // + if (this.options.port != null) { + server.close(emitClose.bind(undefined, this)); + return; + } + } + + process.nextTick(emitClose, this); + } + + /** + * See if a given request should be handled by this server instance. + * + * @param {http.IncomingMessage} req Request object to inspect + * @return {Boolean} `true` if the request is valid, else `false` + * @public + */ + shouldHandle(req) { + if (this.options.path) { + const index = req.url.indexOf('?'); + const pathname = index !== -1 ? req.url.slice(0, index) : req.url; + + if (pathname !== this.options.path) return false; + } + + return true; + } + + /** + * Handle a HTTP Upgrade request. + * + * @param {http.IncomingMessage} req The request object + * @param {(net.Socket|tls.Socket)} socket The network socket between the + * server and client + * @param {Buffer} head The first packet of the upgraded stream + * @param {Function} cb Callback + * @public + */ + handleUpgrade(req, socket, head, cb) { + socket.on('error', socketOnError); + + const key = + req.headers['sec-websocket-key'] !== undefined + ? req.headers['sec-websocket-key'].trim() + : false; + const upgrade = req.headers.upgrade; + const version = +req.headers['sec-websocket-version']; + const extensions = {}; + + if ( + req.method !== 'GET' || + upgrade === undefined || + upgrade.toLowerCase() !== 'websocket' || + !key || + !keyRegex.test(key) || + (version !== 8 && version !== 13) || + !this.shouldHandle(req) + ) { + return abortHandshake(socket, 400); + } + + if (this.options.perMessageDeflate) { + const perMessageDeflate = new PerMessageDeflate( + this.options.perMessageDeflate, + true, + this.options.maxPayload + ); + + try { + const offers = parse(req.headers['sec-websocket-extensions']); + + if (offers[PerMessageDeflate.extensionName]) { + perMessageDeflate.accept(offers[PerMessageDeflate.extensionName]); + extensions[PerMessageDeflate.extensionName] = perMessageDeflate; + } + } catch (err) { + return abortHandshake(socket, 400); + } + } + + // + // Optionally call external client verification handler. + // + if (this.options.verifyClient) { + const info = { + origin: + req.headers[`${version === 8 ? 'sec-websocket-origin' : 'origin'}`], + secure: !!(req.socket.authorized || req.socket.encrypted), + req + }; + + if (this.options.verifyClient.length === 2) { + this.options.verifyClient(info, (verified, code, message, headers) => { + if (!verified) { + return abortHandshake(socket, code || 401, message, headers); + } + + this.completeUpgrade(key, extensions, req, socket, head, cb); + }); + return; + } + + if (!this.options.verifyClient(info)) return abortHandshake(socket, 401); + } + + this.completeUpgrade(key, extensions, req, socket, head, cb); + } + + /** + * Upgrade the connection to WebSocket. + * + * @param {String} key The value of the `Sec-WebSocket-Key` header + * @param {Object} extensions The accepted extensions + * @param {http.IncomingMessage} req The request object + * @param {(net.Socket|tls.Socket)} socket The network socket between the + * server and client + * @param {Buffer} head The first packet of the upgraded stream + * @param {Function} cb Callback + * @throws {Error} If called more than once with the same socket + * @private + */ + completeUpgrade(key, extensions, req, socket, head, cb) { + // + // Destroy the socket if the client has already sent a FIN packet. + // + if (!socket.readable || !socket.writable) return socket.destroy(); + + if (socket[kWebSocket]) { + throw new Error( + 'server.handleUpgrade() was called more than once with the same ' + + 'socket, possibly due to a misconfiguration' + ); + } + + if (this._state > RUNNING) return abortHandshake(socket, 503); + + const digest = createHash('sha1') + .update(key + GUID) + .digest('base64'); + + const headers = [ + 'HTTP/1.1 101 Switching Protocols', + 'Upgrade: websocket', + 'Connection: Upgrade', + `Sec-WebSocket-Accept: ${digest}` + ]; + + const ws = new WebSocket(null); + let protocol = req.headers['sec-websocket-protocol']; + + if (protocol) { + protocol = protocol.split(',').map(trim); + + // + // Optionally call external protocol selection handler. + // + if (this.options.handleProtocols) { + protocol = this.options.handleProtocols(protocol, req); + } else { + protocol = protocol[0]; + } + + if (protocol) { + headers.push(`Sec-WebSocket-Protocol: ${protocol}`); + ws._protocol = protocol; + } + } + + if (extensions[PerMessageDeflate.extensionName]) { + const params = extensions[PerMessageDeflate.extensionName].params; + const value = format({ + [PerMessageDeflate.extensionName]: [params] + }); + headers.push(`Sec-WebSocket-Extensions: ${value}`); + ws._extensions = extensions; + } + + // + // Allow external modification/inspection of handshake headers. + // + this.emit('headers', headers, req); + + socket.write(headers.concat('\r\n').join('\r\n')); + socket.removeListener('error', socketOnError); + + ws.setSocket(socket, head, this.options.maxPayload); + + if (this.clients) { + this.clients.add(ws); + ws.on('close', () => this.clients.delete(ws)); + } + + cb(ws, req); + } +} + +module.exports = WebSocketServer; + +/** + * Add event listeners on an `EventEmitter` using a map of + * pairs. + * + * @param {EventEmitter} server The event emitter + * @param {Object.} map The listeners to add + * @return {Function} A function that will remove the added listeners when + * called + * @private + */ +function addListeners(server, map) { + for (const event of Object.keys(map)) server.on(event, map[event]); + + return function removeListeners() { + for (const event of Object.keys(map)) { + server.removeListener(event, map[event]); + } + }; +} + +/** + * Emit a `'close'` event on an `EventEmitter`. + * + * @param {EventEmitter} server The event emitter + * @private + */ +function emitClose(server) { + server._state = CLOSED; + server.emit('close'); +} + +/** + * Handle premature socket errors. + * + * @private + */ +function socketOnError() { + this.destroy(); +} + +/** + * Close the connection when preconditions are not fulfilled. + * + * @param {(net.Socket|tls.Socket)} socket The socket of the upgrade request + * @param {Number} code The HTTP response status code + * @param {String} [message] The HTTP response body + * @param {Object} [headers] Additional HTTP response headers + * @private + */ +function abortHandshake(socket, code, message, headers) { + if (socket.writable) { + message = message || http.STATUS_CODES[code]; + headers = { + Connection: 'close', + 'Content-Type': 'text/html', + 'Content-Length': Buffer.byteLength(message), + ...headers + }; + + socket.write( + `HTTP/1.1 ${code} ${http.STATUS_CODES[code]}\r\n` + + Object.keys(headers) + .map((h) => `${h}: ${headers[h]}`) + .join('\r\n') + + '\r\n\r\n' + + message + ); + } + + socket.removeListener('error', socketOnError); + socket.destroy(); +} + +/** + * Remove whitespace characters from both ends of a string. + * + * @param {String} str The string + * @return {String} A new string representing `str` stripped of whitespace + * characters from both its beginning and end + * @private + */ +function trim(str) { + return str.trim(); +} Index: frontend/node_modules/ws/lib/websocket.js =================================================================== --- frontend/node_modules/ws/lib/websocket.js (revision 9af201e94b5a79beb92a30858fc54de4bc3b9449) +++ frontend/node_modules/ws/lib/websocket.js (revision 9af201e94b5a79beb92a30858fc54de4bc3b9449) @@ -0,0 +1,1197 @@ +/* eslint no-unused-vars: ["error", { "varsIgnorePattern": "^Readable$" }] */ + +'use strict'; + +const EventEmitter = require('events'); +const https = require('https'); +const http = require('http'); +const net = require('net'); +const tls = require('tls'); +const { randomBytes, createHash } = require('crypto'); +const { Readable } = require('stream'); +const { URL } = require('url'); + +const PerMessageDeflate = require('./permessage-deflate'); +const Receiver = require('./receiver'); +const Sender = require('./sender'); +const { + BINARY_TYPES, + EMPTY_BUFFER, + GUID, + kStatusCode, + kWebSocket, + NOOP +} = require('./constants'); +const { addEventListener, removeEventListener } = require('./event-target'); +const { format, parse } = require('./extension'); +const { toBuffer } = require('./buffer-util'); + +const readyStates = ['CONNECTING', 'OPEN', 'CLOSING', 'CLOSED']; +const protocolVersions = [8, 13]; +const closeTimeout = 30 * 1000; + +/** + * Class representing a WebSocket. + * + * @extends EventEmitter + */ +class WebSocket extends EventEmitter { + /** + * Create a new `WebSocket`. + * + * @param {(String|URL)} address The URL to which to connect + * @param {(String|String[])} [protocols] The subprotocols + * @param {Object} [options] Connection options + */ + constructor(address, protocols, options) { + super(); + + this._binaryType = BINARY_TYPES[0]; + this._closeCode = 1006; + this._closeFrameReceived = false; + this._closeFrameSent = false; + this._closeMessage = ''; + this._closeTimer = null; + this._extensions = {}; + this._protocol = ''; + this._readyState = WebSocket.CONNECTING; + this._receiver = null; + this._sender = null; + this._socket = null; + + if (address !== null) { + this._bufferedAmount = 0; + this._isServer = false; + this._redirects = 0; + + if (Array.isArray(protocols)) { + protocols = protocols.join(', '); + } else if (typeof protocols === 'object' && protocols !== null) { + options = protocols; + protocols = undefined; + } + + initAsClient(this, address, protocols, options); + } else { + this._isServer = true; + } + } + + /** + * 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 (!BINARY_TYPES.includes(type)) return; + + this._binaryType = type; + + // + // Allow to change `binaryType` on the fly. + // + if (this._receiver) this._receiver._binaryType = type; + } + + /** + * @type {Number} + */ + get bufferedAmount() { + if (!this._socket) return this._bufferedAmount; + + return this._socket._writableState.length + this._sender._bufferedBytes; + } + + /** + * @type {String} + */ + get extensions() { + return Object.keys(this._extensions).join(); + } + + /** + * @type {Function} + */ + /* istanbul ignore next */ + get onclose() { + return undefined; + } + + /* istanbul ignore next */ + set onclose(listener) {} + + /** + * @type {Function} + */ + /* istanbul ignore next */ + get onerror() { + return undefined; + } + + /* istanbul ignore next */ + set onerror(listener) {} + + /** + * @type {Function} + */ + /* istanbul ignore next */ + get onopen() { + return undefined; + } + + /* istanbul ignore next */ + set onopen(listener) {} + + /** + * @type {Function} + */ + /* istanbul ignore next */ + get onmessage() { + return undefined; + } + + /* istanbul ignore next */ + set onmessage(listener) {} + + /** + * @type {String} + */ + get protocol() { + return this._protocol; + } + + /** + * @type {Number} + */ + get readyState() { + return this._readyState; + } + + /** + * @type {String} + */ + get url() { + return this._url; + } + + /** + * Set up the socket and the internal resources. + * + * @param {(net.Socket|tls.Socket)} socket The network socket between the + * server and client + * @param {Buffer} head The first packet of the upgraded stream + * @param {Number} [maxPayload=0] The maximum allowed message size + * @private + */ + setSocket(socket, head, maxPayload) { + const receiver = new Receiver( + this.binaryType, + this._extensions, + this._isServer, + maxPayload + ); + + this._sender = new Sender(socket, this._extensions); + this._receiver = receiver; + this._socket = socket; + + receiver[kWebSocket] = this; + socket[kWebSocket] = this; + + receiver.on('conclude', receiverOnConclude); + receiver.on('drain', receiverOnDrain); + receiver.on('error', receiverOnError); + receiver.on('message', receiverOnMessage); + receiver.on('ping', receiverOnPing); + receiver.on('pong', receiverOnPong); + + socket.setTimeout(0); + socket.setNoDelay(); + + if (head.length > 0) socket.unshift(head); + + socket.on('close', socketOnClose); + socket.on('data', socketOnData); + socket.on('end', socketOnEnd); + socket.on('error', socketOnError); + + this._readyState = WebSocket.OPEN; + this.emit('open'); + } + + /** + * Emit the `'close'` event. + * + * @private + */ + emitClose() { + if (!this._socket) { + this._readyState = WebSocket.CLOSED; + this.emit('close', this._closeCode, this._closeMessage); + return; + } + + if (this._extensions[PerMessageDeflate.extensionName]) { + this._extensions[PerMessageDeflate.extensionName].cleanup(); + } + + this._receiver.removeAllListeners(); + this._readyState = WebSocket.CLOSED; + this.emit('close', this._closeCode, this._closeMessage); + } + + /** + * Start a closing handshake. + * + * +----------+ +-----------+ +----------+ + * - - -|ws.close()|-->|close frame|-->|ws.close()|- - - + * | +----------+ +-----------+ +----------+ | + * +----------+ +-----------+ | + * CLOSING |ws.close()|<--|close frame|<--+-----+ CLOSING + * +----------+ +-----------+ | + * | | | +---+ | + * +------------------------+-->|fin| - - - - + * | +---+ | +---+ + * - - - - -|fin|<---------------------+ + * +---+ + * + * @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) { + const msg = 'WebSocket was closed before the connection was established'; + return abortHandshake(this, this._req, msg); + } + + if (this.readyState === WebSocket.CLOSING) { + if ( + this._closeFrameSent && + (this._closeFrameReceived || this._receiver._writableState.errorEmitted) + ) { + this._socket.end(); + } + + return; + } + + this._readyState = WebSocket.CLOSING; + this._sender.close(code, data, !this._isServer, (err) => { + // + // This error is handled by the `'error'` listener on the socket. We only + // want to know if the close frame has been sent here. + // + if (err) return; + + this._closeFrameSent = true; + + if ( + this._closeFrameReceived || + this._receiver._writableState.errorEmitted + ) { + this._socket.end(); + } + }); + + // + // Specify a timeout for the closing handshake to complete. + // + this._closeTimer = setTimeout( + this._socket.destroy.bind(this._socket), + closeTimeout + ); + } + + /** + * Send a ping. + * + * @param {*} [data] The data to send + * @param {Boolean} [mask] Indicates whether or not to mask `data` + * @param {Function} [cb] Callback which is executed when the ping is sent + * @public + */ + ping(data, mask, cb) { + if (this.readyState === WebSocket.CONNECTING) { + throw new Error('WebSocket is not open: readyState 0 (CONNECTING)'); + } + + if (typeof data === 'function') { + cb = data; + data = mask = undefined; + } else if (typeof mask === 'function') { + cb = mask; + mask = undefined; + } + + if (typeof data === 'number') data = data.toString(); + + if (this.readyState !== WebSocket.OPEN) { + sendAfterClose(this, data, cb); + return; + } + + if (mask === undefined) mask = !this._isServer; + this._sender.ping(data || EMPTY_BUFFER, mask, cb); + } + + /** + * Send a pong. + * + * @param {*} [data] The data to send + * @param {Boolean} [mask] Indicates whether or not to mask `data` + * @param {Function} [cb] Callback which is executed when the pong is sent + * @public + */ + pong(data, mask, cb) { + if (this.readyState === WebSocket.CONNECTING) { + throw new Error('WebSocket is not open: readyState 0 (CONNECTING)'); + } + + if (typeof data === 'function') { + cb = data; + data = mask = undefined; + } else if (typeof mask === 'function') { + cb = mask; + mask = undefined; + } + + if (typeof data === 'number') data = data.toString(); + + if (this.readyState !== WebSocket.OPEN) { + sendAfterClose(this, data, cb); + return; + } + + if (mask === undefined) mask = !this._isServer; + this._sender.pong(data || EMPTY_BUFFER, mask, cb); + } + + /** + * 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=true] 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 (this.readyState === WebSocket.CONNECTING) { + throw new Error('WebSocket is not open: readyState 0 (CONNECTING)'); + } + + if (typeof options === 'function') { + cb = options; + options = {}; + } + + if (typeof data === 'number') data = data.toString(); + + if (this.readyState !== WebSocket.OPEN) { + sendAfterClose(this, data, cb); + return; + } + + const opts = { + binary: typeof data !== 'string', + mask: !this._isServer, + compress: true, + fin: true, + ...options + }; + + if (!this._extensions[PerMessageDeflate.extensionName]) { + opts.compress = false; + } + + this._sender.send(data || EMPTY_BUFFER, opts, cb); + } + + /** + * Forcibly close the connection. + * + * @public + */ + terminate() { + if (this.readyState === WebSocket.CLOSED) return; + if (this.readyState === WebSocket.CONNECTING) { + const msg = 'WebSocket was closed before the connection was established'; + return abortHandshake(this, this._req, msg); + } + + if (this._socket) { + this._readyState = WebSocket.CLOSING; + this._socket.destroy(); + } + } +} + +/** + * @constant {Number} CONNECTING + * @memberof WebSocket + */ +Object.defineProperty(WebSocket, 'CONNECTING', { + enumerable: true, + value: readyStates.indexOf('CONNECTING') +}); + +/** + * @constant {Number} CONNECTING + * @memberof WebSocket.prototype + */ +Object.defineProperty(WebSocket.prototype, 'CONNECTING', { + enumerable: true, + value: readyStates.indexOf('CONNECTING') +}); + +/** + * @constant {Number} OPEN + * @memberof WebSocket + */ +Object.defineProperty(WebSocket, 'OPEN', { + enumerable: true, + value: readyStates.indexOf('OPEN') +}); + +/** + * @constant {Number} OPEN + * @memberof WebSocket.prototype + */ +Object.defineProperty(WebSocket.prototype, 'OPEN', { + enumerable: true, + value: readyStates.indexOf('OPEN') +}); + +/** + * @constant {Number} CLOSING + * @memberof WebSocket + */ +Object.defineProperty(WebSocket, 'CLOSING', { + enumerable: true, + value: readyStates.indexOf('CLOSING') +}); + +/** + * @constant {Number} CLOSING + * @memberof WebSocket.prototype + */ +Object.defineProperty(WebSocket.prototype, 'CLOSING', { + enumerable: true, + value: readyStates.indexOf('CLOSING') +}); + +/** + * @constant {Number} CLOSED + * @memberof WebSocket + */ +Object.defineProperty(WebSocket, 'CLOSED', { + enumerable: true, + value: readyStates.indexOf('CLOSED') +}); + +/** + * @constant {Number} CLOSED + * @memberof WebSocket.prototype + */ +Object.defineProperty(WebSocket.prototype, 'CLOSED', { + enumerable: true, + value: readyStates.indexOf('CLOSED') +}); + +[ + 'binaryType', + 'bufferedAmount', + 'extensions', + 'protocol', + 'readyState', + 'url' +].forEach((property) => { + Object.defineProperty(WebSocket.prototype, property, { enumerable: true }); +}); + +// +// 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}`, { + enumerable: true, + get() { + const listeners = this.listeners(method); + for (let i = 0; i < listeners.length; i++) { + if (listeners[i]._listener) return listeners[i]._listener; + } + + return undefined; + }, + set(listener) { + const listeners = this.listeners(method); + for (let 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 = addEventListener; +WebSocket.prototype.removeEventListener = removeEventListener; + +module.exports = WebSocket; + +/** + * Initialize a WebSocket client. + * + * @param {WebSocket} websocket The client to initialize + * @param {(String|URL)} address The URL to which to connect + * @param {String} [protocols] The subprotocols + * @param {Object} [options] Connection options + * @param {(Boolean|Object)} [options.perMessageDeflate=true] Enable/disable + * permessage-deflate + * @param {Number} [options.handshakeTimeout] Timeout in milliseconds for the + * handshake request + * @param {Number} [options.protocolVersion=13] Value of the + * `Sec-WebSocket-Version` header + * @param {String} [options.origin] Value of the `Origin` or + * `Sec-WebSocket-Origin` header + * @param {Number} [options.maxPayload=104857600] The maximum allowed message + * size + * @param {Boolean} [options.followRedirects=false] Whether or not to follow + * redirects + * @param {Number} [options.maxRedirects=10] The maximum number of redirects + * allowed + * @private + */ +function initAsClient(websocket, address, protocols, options) { + const opts = { + protocolVersion: protocolVersions[1], + maxPayload: 100 * 1024 * 1024, + perMessageDeflate: true, + followRedirects: false, + maxRedirects: 10, + ...options, + createConnection: undefined, + socketPath: undefined, + hostname: undefined, + protocol: undefined, + timeout: undefined, + method: undefined, + host: undefined, + path: undefined, + port: undefined + }; + + if (!protocolVersions.includes(opts.protocolVersion)) { + throw new RangeError( + `Unsupported protocol version: ${opts.protocolVersion} ` + + `(supported versions: ${protocolVersions.join(', ')})` + ); + } + + let parsedUrl; + + if (address instanceof URL) { + parsedUrl = address; + websocket._url = address.href; + } else { + parsedUrl = new URL(address); + websocket._url = address; + } + + const isUnixSocket = parsedUrl.protocol === 'ws+unix:'; + + if (!parsedUrl.host && (!isUnixSocket || !parsedUrl.pathname)) { + const err = new Error(`Invalid URL: ${websocket.url}`); + + if (websocket._redirects === 0) { + throw err; + } else { + emitErrorAndClose(websocket, err); + return; + } + } + + const isSecure = + parsedUrl.protocol === 'wss:' || parsedUrl.protocol === 'https:'; + const defaultPort = isSecure ? 443 : 80; + const key = randomBytes(16).toString('base64'); + const get = isSecure ? https.get : http.get; + let perMessageDeflate; + + opts.createConnection = isSecure ? tlsConnect : netConnect; + opts.defaultPort = opts.defaultPort || defaultPort; + opts.port = parsedUrl.port || defaultPort; + opts.host = parsedUrl.hostname.startsWith('[') + ? parsedUrl.hostname.slice(1, -1) + : parsedUrl.hostname; + opts.headers = { + 'Sec-WebSocket-Version': opts.protocolVersion, + 'Sec-WebSocket-Key': key, + Connection: 'Upgrade', + Upgrade: 'websocket', + ...opts.headers + }; + opts.path = parsedUrl.pathname + parsedUrl.search; + opts.timeout = opts.handshakeTimeout; + + if (opts.perMessageDeflate) { + perMessageDeflate = new PerMessageDeflate( + opts.perMessageDeflate !== true ? opts.perMessageDeflate : {}, + false, + opts.maxPayload + ); + opts.headers['Sec-WebSocket-Extensions'] = format({ + [PerMessageDeflate.extensionName]: perMessageDeflate.offer() + }); + } + if (protocols) { + opts.headers['Sec-WebSocket-Protocol'] = protocols; + } + if (opts.origin) { + if (opts.protocolVersion < 13) { + opts.headers['Sec-WebSocket-Origin'] = opts.origin; + } else { + opts.headers.Origin = opts.origin; + } + } + if (parsedUrl.username || parsedUrl.password) { + opts.auth = `${parsedUrl.username}:${parsedUrl.password}`; + } + + if (isUnixSocket) { + const parts = opts.path.split(':'); + + opts.socketPath = parts[0]; + opts.path = parts[1]; + } + + if (opts.followRedirects) { + if (websocket._redirects === 0) { + websocket._originalUnixSocket = isUnixSocket; + websocket._originalSecure = isSecure; + websocket._originalHostOrSocketPath = isUnixSocket + ? opts.socketPath + : parsedUrl.host; + + const headers = options && options.headers; + + // + // Shallow copy the user provided options so that headers can be changed + // without mutating the original object. + // + options = { ...options, headers: {} }; + + if (headers) { + for (const [key, value] of Object.entries(headers)) { + options.headers[key.toLowerCase()] = value; + } + } + } else { + const isSameHost = isUnixSocket + ? websocket._originalUnixSocket + ? opts.socketPath === websocket._originalHostOrSocketPath + : false + : websocket._originalUnixSocket + ? false + : parsedUrl.host === websocket._originalHostOrSocketPath; + + if (!isSameHost || (websocket._originalSecure && !isSecure)) { + // + // Match curl 7.77.0 behavior and drop the following headers. These + // headers are also dropped when following a redirect to a subdomain. + // + delete opts.headers.authorization; + delete opts.headers.cookie; + + if (!isSameHost) delete opts.headers.host; + + opts.auth = undefined; + } + } + + // + // Match curl 7.77.0 behavior and make the first `Authorization` header win. + // If the `Authorization` header is set, then there is nothing to do as it + // will take precedence. + // + if (opts.auth && !options.headers.authorization) { + options.headers.authorization = + 'Basic ' + Buffer.from(opts.auth).toString('base64'); + } + } + + let req = (websocket._req = get(opts)); + + if (opts.timeout) { + req.on('timeout', () => { + abortHandshake(websocket, req, 'Opening handshake has timed out'); + }); + } + + req.on('error', (err) => { + if (req === null || req.aborted) return; + + req = websocket._req = null; + emitErrorAndClose(websocket, err); + }); + + req.on('response', (res) => { + const location = res.headers.location; + const statusCode = res.statusCode; + + if ( + location && + opts.followRedirects && + statusCode >= 300 && + statusCode < 400 + ) { + if (++websocket._redirects > opts.maxRedirects) { + abortHandshake(websocket, req, 'Maximum redirects exceeded'); + return; + } + + req.abort(); + + let addr; + + try { + addr = new URL(location, address); + } catch (err) { + emitErrorAndClose(websocket, err); + return; + } + + initAsClient(websocket, addr, protocols, options); + } else if (!websocket.emit('unexpected-response', req, res)) { + abortHandshake( + websocket, + req, + `Unexpected server response: ${res.statusCode}` + ); + } + }); + + req.on('upgrade', (res, socket, head) => { + websocket.emit('upgrade', res); + + // + // The user may have closed the connection from a listener of the `upgrade` + // event. + // + if (websocket.readyState !== WebSocket.CONNECTING) return; + + req = websocket._req = null; + + const upgrade = res.headers.upgrade; + + if (upgrade === undefined || upgrade.toLowerCase() !== 'websocket') { + abortHandshake(websocket, socket, 'Invalid Upgrade header'); + return; + } + + const digest = createHash('sha1') + .update(key + GUID) + .digest('base64'); + + if (res.headers['sec-websocket-accept'] !== digest) { + abortHandshake(websocket, socket, 'Invalid Sec-WebSocket-Accept header'); + return; + } + + const serverProt = res.headers['sec-websocket-protocol']; + const protList = (protocols || '').split(/, */); + let 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(websocket, socket, protError); + return; + } + + if (serverProt) websocket._protocol = serverProt; + + const secWebSocketExtensions = res.headers['sec-websocket-extensions']; + + if (secWebSocketExtensions !== undefined) { + if (!perMessageDeflate) { + const message = + 'Server sent a Sec-WebSocket-Extensions header but no extension ' + + 'was requested'; + abortHandshake(websocket, socket, message); + return; + } + + let extensions; + + try { + extensions = parse(secWebSocketExtensions); + } catch (err) { + const message = 'Invalid Sec-WebSocket-Extensions header'; + abortHandshake(websocket, socket, message); + return; + } + + const extensionNames = Object.keys(extensions); + + if (extensionNames.length) { + if ( + extensionNames.length !== 1 || + extensionNames[0] !== PerMessageDeflate.extensionName + ) { + const message = + 'Server indicated an extension that was not requested'; + abortHandshake(websocket, socket, message); + return; + } + + try { + perMessageDeflate.accept(extensions[PerMessageDeflate.extensionName]); + } catch (err) { + const message = 'Invalid Sec-WebSocket-Extensions header'; + abortHandshake(websocket, socket, message); + return; + } + + websocket._extensions[PerMessageDeflate.extensionName] = + perMessageDeflate; + } + } + + websocket.setSocket(socket, head, opts.maxPayload); + }); +} + +/** + * Emit the `'error'` and `'close'` event. + * + * @param {WebSocket} websocket The WebSocket instance + * @param {Error} The error to emit + * @private + */ +function emitErrorAndClose(websocket, err) { + websocket._readyState = WebSocket.CLOSING; + websocket.emit('error', err); + websocket.emitClose(); +} + +/** + * 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) { + 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; + + if (!options.servername && options.servername !== '') { + options.servername = net.isIP(options.host) ? '' : options.host; + } + + return tls.connect(options); +} + +/** + * Abort the handshake and emit an error. + * + * @param {WebSocket} websocket The WebSocket instance + * @param {(http.ClientRequest|net.Socket|tls.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(); + + if (stream.socket && !stream.socket.destroyed) { + // + // On Node.js >= 14.3.0 `request.abort()` does not destroy the socket if + // called after the request completed. See + // https://github.com/websockets/ws/issues/1869. + // + stream.socket.destroy(); + } + + 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)); + } +} + +/** + * Handle cases where the `ping()`, `pong()`, or `send()` methods are called + * when the `readyState` attribute is `CLOSING` or `CLOSED`. + * + * @param {WebSocket} websocket The WebSocket instance + * @param {*} [data] The data to send + * @param {Function} [cb] Callback + * @private + */ +function sendAfterClose(websocket, data, cb) { + if (data) { + const length = toBuffer(data).length; + + // + // The `_bufferedAmount` property is used only when the peer is a client and + // the opening handshake fails. Under these circumstances, in fact, the + // `setSocket()` method is not called, so the `_socket` and `_sender` + // properties are set to `null`. + // + if (websocket._socket) websocket._sender._bufferedBytes += length; + else websocket._bufferedAmount += length; + } + + if (cb) { + const err = new Error( + `WebSocket is not open: readyState ${websocket.readyState} ` + + `(${readyStates[websocket.readyState]})` + ); + cb(err); + } +} + +/** + * 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._closeFrameReceived = true; + websocket._closeMessage = reason; + websocket._closeCode = code; + + if (websocket._socket[kWebSocket] === undefined) return; + + websocket._socket.removeListener('data', socketOnData); + process.nextTick(resume, websocket._socket); + + 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]; + + if (websocket._socket[kWebSocket] !== undefined) { + websocket._socket.removeListener('data', socketOnData); + + // + // On Node.js < 14.0.0 the `'error'` event is emitted synchronously. See + // https://github.com/websockets/ws/issues/1940. + // + process.nextTick(resume, websocket._socket); + + websocket.close(err[kStatusCode]); + } + + websocket.emit('error', err); +} + +/** + * 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, 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); +} + +/** + * Resume a readable stream + * + * @param {Readable} stream The readable stream + * @private + */ +function resume(stream) { + stream.resume(); +} + +/** + * The listener of the `net.Socket` `'close'` event. + * + * @private + */ +function socketOnClose() { + const websocket = this[kWebSocket]; + + this.removeListener('close', socketOnClose); + this.removeListener('data', socketOnData); + this.removeListener('end', socketOnEnd); + + websocket._readyState = WebSocket.CLOSING; + + let chunk; + + // + // 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. + // + if ( + !this._readableState.endEmitted && + !websocket._closeFrameReceived && + !websocket._receiver._writableState.errorEmitted && + (chunk = websocket._socket.read()) !== null + ) { + websocket._receiver.write(chunk); + } + + websocket._receiver.end(); + + 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', NOOP); + + if (websocket) { + websocket._readyState = WebSocket.CLOSING; + this.destroy(); + } +}