1 line
46 KiB
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1 line
46 KiB
JSON
{"ast":null,"code":"/* eslint no-unused-vars: [\"error\", { \"varsIgnorePattern\": \"^Duplex$\", \"caughtErrors\": \"none\" }] */\n\n'use strict';\n\nconst EventEmitter = require('events');\nconst http = require('http');\nconst {\n Duplex\n} = require('stream');\nconst {\n createHash\n} = require('crypto');\nconst extension = require('./extension');\nconst PerMessageDeflate = require('./permessage-deflate');\nconst subprotocol = require('./subprotocol');\nconst WebSocket = require('./websocket');\nconst {\n GUID,\n kWebSocket\n} = require('./constants');\nconst keyRegex = /^[+/0-9A-Za-z]{22}==$/;\nconst RUNNING = 0;\nconst CLOSING = 1;\nconst CLOSED = 2;\n\n/**\n * Class representing a WebSocket server.\n *\n * @extends EventEmitter\n */\nclass WebSocketServer extends EventEmitter {\n /**\n * Create a `WebSocketServer` instance.\n *\n * @param {Object} options Configuration options\n * @param {Boolean} [options.allowSynchronousEvents=true] Specifies whether\n * any of the `'message'`, `'ping'`, and `'pong'` events can be emitted\n * multiple times in the same tick\n * @param {Boolean} [options.autoPong=true] Specifies whether or not to\n * automatically send a pong in response to a ping\n * @param {Number} [options.backlog=511] The maximum length of the queue of\n * pending connections\n * @param {Boolean} [options.clientTracking=true] Specifies whether or not to\n * track clients\n * @param {Function} [options.handleProtocols] A hook to handle protocols\n * @param {String} [options.host] The hostname where to bind the server\n * @param {Number} [options.maxPayload=104857600] The maximum allowed message\n * size\n * @param {Boolean} [options.noServer=false] Enable no server mode\n * @param {String} [options.path] Accept only connections matching this path\n * @param {(Boolean|Object)} [options.perMessageDeflate=false] Enable/disable\n * permessage-deflate\n * @param {Number} [options.port] The port where to bind the server\n * @param {(http.Server|https.Server)} [options.server] A pre-created HTTP/S\n * server to use\n * @param {Boolean} [options.skipUTF8Validation=false] Specifies whether or\n * not to skip UTF-8 validation for text and close messages\n * @param {Function} [options.verifyClient] A hook to reject connections\n * @param {Function} [options.WebSocket=WebSocket] Specifies the `WebSocket`\n * class to use. It must be the `WebSocket` class or class that extends it\n * @param {Function} [callback] A listener for the `listening` event\n */\n constructor(options, callback) {\n super();\n options = {\n allowSynchronousEvents: true,\n autoPong: true,\n maxPayload: 100 * 1024 * 1024,\n skipUTF8Validation: false,\n perMessageDeflate: false,\n handleProtocols: null,\n clientTracking: true,\n verifyClient: null,\n noServer: false,\n backlog: null,\n // use default (511 as implemented in net.js)\n server: null,\n host: null,\n path: null,\n port: null,\n WebSocket,\n ...options\n };\n if (options.port == null && !options.server && !options.noServer || options.port != null && (options.server || options.noServer) || options.server && options.noServer) {\n throw new TypeError('One and only one of the \"port\", \"server\", or \"noServer\" options ' + 'must be specified');\n }\n if (options.port != null) {\n this._server = http.createServer((req, res) => {\n const body = http.STATUS_CODES[426];\n res.writeHead(426, {\n 'Content-Length': body.length,\n 'Content-Type': 'text/plain'\n });\n res.end(body);\n });\n this._server.listen(options.port, options.host, options.backlog, callback);\n } else if (options.server) {\n this._server = options.server;\n }\n if (this._server) {\n const emitConnection = this.emit.bind(this, 'connection');\n this._removeListeners = addListeners(this._server, {\n listening: this.emit.bind(this, 'listening'),\n error: this.emit.bind(this, 'error'),\n upgrade: (req, socket, head) => {\n this.handleUpgrade(req, socket, head, emitConnection);\n }\n });\n }\n if (options.perMessageDeflate === true) options.perMessageDeflate = {};\n if (options.clientTracking) {\n this.clients = new Set();\n this._shouldEmitClose = false;\n }\n this.options = options;\n this._state = RUNNING;\n }\n\n /**\n * Returns the bound address, the address family name, and port of the server\n * as reported by the operating system if listening on an IP socket.\n * If the server is listening on a pipe or UNIX domain socket, the name is\n * returned as a string.\n *\n * @return {(Object|String|null)} The address of the server\n * @public\n */\n address() {\n if (this.options.noServer) {\n throw new Error('The server is operating in \"noServer\" mode');\n }\n if (!this._server) return null;\n return this._server.address();\n }\n\n /**\n * Stop the server from accepting new connections and emit the `'close'` event\n * when all existing connections are closed.\n *\n * @param {Function} [cb] A one-time listener for the `'close'` event\n * @public\n */\n close(cb) {\n if (this._state === CLOSED) {\n if (cb) {\n this.once('close', () => {\n cb(new Error('The server is not running'));\n });\n }\n process.nextTick(emitClose, this);\n return;\n }\n if (cb) this.once('close', cb);\n if (this._state === CLOSING) return;\n this._state = CLOSING;\n if (this.options.noServer || this.options.server) {\n if (this._server) {\n this._removeListeners();\n this._removeListeners = this._server = null;\n }\n if (this.clients) {\n if (!this.clients.size) {\n process.nextTick(emitClose, this);\n } else {\n this._shouldEmitClose = true;\n }\n } else {\n process.nextTick(emitClose, this);\n }\n } else {\n const server = this._server;\n this._removeListeners();\n this._removeListeners = this._server = null;\n\n //\n // The HTTP/S server was created internally. Close it, and rely on its\n // `'close'` event.\n //\n server.close(() => {\n emitClose(this);\n });\n }\n }\n\n /**\n * See if a given request should be handled by this server instance.\n *\n * @param {http.IncomingMessage} req Request object to inspect\n * @return {Boolean} `true` if the request is valid, else `false`\n * @public\n */\n shouldHandle(req) {\n if (this.options.path) {\n const index = req.url.indexOf('?');\n const pathname = index !== -1 ? req.url.slice(0, index) : req.url;\n if (pathname !== this.options.path) return false;\n }\n return true;\n }\n\n /**\n * Handle a HTTP Upgrade request.\n *\n * @param {http.IncomingMessage} req The request object\n * @param {Duplex} socket The network socket between the server and client\n * @param {Buffer} head The first packet of the upgraded stream\n * @param {Function} cb Callback\n * @public\n */\n handleUpgrade(req, socket, head, cb) {\n socket.on('error', socketOnError);\n const key = req.headers['sec-websocket-key'];\n const upgrade = req.headers.upgrade;\n const version = +req.headers['sec-websocket-version'];\n if (req.method !== 'GET') {\n const message = 'Invalid HTTP method';\n abortHandshakeOrEmitwsClientError(this, req, socket, 405, message);\n return;\n }\n if (upgrade === undefined || upgrade.toLowerCase() !== 'websocket') {\n const message = 'Invalid Upgrade header';\n abortHandshakeOrEmitwsClientError(this, req, socket, 400, message);\n return;\n }\n if (key === undefined || !keyRegex.test(key)) {\n const message = 'Missing or invalid Sec-WebSocket-Key header';\n abortHandshakeOrEmitwsClientError(this, req, socket, 400, message);\n return;\n }\n if (version !== 8 && version !== 13) {\n const message = 'Missing or invalid Sec-WebSocket-Version header';\n abortHandshakeOrEmitwsClientError(this, req, socket, 400, message);\n return;\n }\n if (!this.shouldHandle(req)) {\n abortHandshake(socket, 400);\n return;\n }\n const secWebSocketProtocol = req.headers['sec-websocket-protocol'];\n let protocols = new Set();\n if (secWebSocketProtocol !== undefined) {\n try {\n protocols = subprotocol.parse(secWebSocketProtocol);\n } catch (err) {\n const message = 'Invalid Sec-WebSocket-Protocol header';\n abortHandshakeOrEmitwsClientError(this, req, socket, 400, message);\n return;\n }\n }\n const secWebSocketExtensions = req.headers['sec-websocket-extensions'];\n const extensions = {};\n if (this.options.perMessageDeflate && secWebSocketExtensions !== undefined) {\n const perMessageDeflate = new PerMessageDeflate(this.options.perMessageDeflate, true, this.options.maxPayload);\n try {\n const offers = extension.parse(secWebSocketExtensions);\n if (offers[PerMessageDeflate.extensionName]) {\n perMessageDeflate.accept(offers[PerMessageDeflate.extensionName]);\n extensions[PerMessageDeflate.extensionName] = perMessageDeflate;\n }\n } catch (err) {\n const message = 'Invalid or unacceptable Sec-WebSocket-Extensions header';\n abortHandshakeOrEmitwsClientError(this, req, socket, 400, message);\n return;\n }\n }\n\n //\n // Optionally call external client verification handler.\n //\n if (this.options.verifyClient) {\n const info = {\n origin: req.headers[`${version === 8 ? 'sec-websocket-origin' : 'origin'}`],\n secure: !!(req.socket.authorized || req.socket.encrypted),\n req\n };\n if (this.options.verifyClient.length === 2) {\n this.options.verifyClient(info, (verified, code, message, headers) => {\n if (!verified) {\n return abortHandshake(socket, code || 401, message, headers);\n }\n this.completeUpgrade(extensions, key, protocols, req, socket, head, cb);\n });\n return;\n }\n if (!this.options.verifyClient(info)) return abortHandshake(socket, 401);\n }\n this.completeUpgrade(extensions, key, protocols, req, socket, head, cb);\n }\n\n /**\n * Upgrade the connection to WebSocket.\n *\n * @param {Object} extensions The accepted extensions\n * @param {String} key The value of the `Sec-WebSocket-Key` header\n * @param {Set} protocols The subprotocols\n * @param {http.IncomingMessage} req The request object\n * @param {Duplex} socket The network socket between the server and client\n * @param {Buffer} head The first packet of the upgraded stream\n * @param {Function} cb Callback\n * @throws {Error} If called more than once with the same socket\n * @private\n */\n completeUpgrade(extensions, key, protocols, req, socket, head, cb) {\n //\n // Destroy the socket if the client has already sent a FIN packet.\n //\n if (!socket.readable || !socket.writable) return socket.destroy();\n if (socket[kWebSocket]) {\n throw new Error('server.handleUpgrade() was called more than once with the same ' + 'socket, possibly due to a misconfiguration');\n }\n if (this._state > RUNNING) return abortHandshake(socket, 503);\n const digest = createHash('sha1').update(key + GUID).digest('base64');\n const headers = ['HTTP/1.1 101 Switching Protocols', 'Upgrade: websocket', 'Connection: Upgrade', `Sec-WebSocket-Accept: ${digest}`];\n const ws = new this.options.WebSocket(null, undefined, this.options);\n if (protocols.size) {\n //\n // Optionally call external protocol selection handler.\n //\n const protocol = this.options.handleProtocols ? this.options.handleProtocols(protocols, req) : protocols.values().next().value;\n if (protocol) {\n headers.push(`Sec-WebSocket-Protocol: ${protocol}`);\n ws._protocol = protocol;\n }\n }\n if (extensions[PerMessageDeflate.extensionName]) {\n const params = extensions[PerMessageDeflate.extensionName].params;\n const value = extension.format({\n [PerMessageDeflate.extensionName]: [params]\n });\n headers.push(`Sec-WebSocket-Extensions: ${value}`);\n ws._extensions = extensions;\n }\n\n //\n // Allow external modification/inspection of handshake headers.\n //\n this.emit('headers', headers, req);\n socket.write(headers.concat('\\r\\n').join('\\r\\n'));\n socket.removeListener('error', socketOnError);\n ws.setSocket(socket, head, {\n allowSynchronousEvents: this.options.allowSynchronousEvents,\n maxPayload: this.options.maxPayload,\n skipUTF8Validation: this.options.skipUTF8Validation\n });\n if (this.clients) {\n this.clients.add(ws);\n ws.on('close', () => {\n this.clients.delete(ws);\n if (this._shouldEmitClose && !this.clients.size) {\n process.nextTick(emitClose, this);\n }\n });\n }\n cb(ws, req);\n }\n}\nmodule.exports = WebSocketServer;\n\n/**\n * Add event listeners on an `EventEmitter` using a map of <event, listener>\n * pairs.\n *\n * @param {EventEmitter} server The event emitter\n * @param {Object.<String, Function>} map The listeners to add\n * @return {Function} A function that will remove the added listeners when\n * called\n * @private\n */\nfunction addListeners(server, map) {\n for (const event of Object.keys(map)) server.on(event, map[event]);\n return function removeListeners() {\n for (const event of Object.keys(map)) {\n server.removeListener(event, map[event]);\n }\n };\n}\n\n/**\n * Emit a `'close'` event on an `EventEmitter`.\n *\n * @param {EventEmitter} server The event emitter\n * @private\n */\nfunction emitClose(server) {\n server._state = CLOSED;\n server.emit('close');\n}\n\n/**\n * Handle socket errors.\n *\n * @private\n */\nfunction socketOnError() {\n this.destroy();\n}\n\n/**\n * Close the connection when preconditions are not fulfilled.\n *\n * @param {Duplex} socket The socket of the upgrade request\n * @param {Number} code The HTTP response status code\n * @param {String} [message] The HTTP response body\n * @param {Object} [headers] Additional HTTP response headers\n * @private\n */\nfunction abortHandshake(socket, code, message, headers) {\n //\n // The socket is writable unless the user destroyed or ended it before calling\n // `server.handleUpgrade()` or in the `verifyClient` function, which is a user\n // error. Handling this does not make much sense as the worst that can happen\n // is that some of the data written by the user might be discarded due to the\n // call to `socket.end()` below, which triggers an `'error'` event that in\n // turn causes the socket to be destroyed.\n //\n message = message || http.STATUS_CODES[code];\n headers = {\n Connection: 'close',\n 'Content-Type': 'text/html',\n 'Content-Length': Buffer.byteLength(message),\n ...headers\n };\n socket.once('finish', socket.destroy);\n socket.end(`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);\n}\n\n/**\n * Emit a `'wsClientError'` event on a `WebSocketServer` if there is at least\n * one listener for it, otherwise call `abortHandshake()`.\n *\n * @param {WebSocketServer} server The WebSocket server\n * @param {http.IncomingMessage} req The request object\n * @param {Duplex} socket The socket of the upgrade request\n * @param {Number} code The HTTP response status code\n * @param {String} message The HTTP response body\n * @private\n */\nfunction abortHandshakeOrEmitwsClientError(server, req, socket, code, message) {\n if (server.listenerCount('wsClientError')) {\n const err = new Error(message);\n Error.captureStackTrace(err, abortHandshakeOrEmitwsClientError);\n server.emit('wsClientError', err, socket, req);\n } else {\n abortHandshake(socket, code, message);\n }\n}","map":{"version":3,"names":["EventEmitter","require","http","Duplex","createHash","extension","PerMessageDeflate","subprotocol","WebSocket","GUID","kWebSocket","keyRegex","RUNNING","CLOSING","CLOSED","WebSocketServer","constructor","options","callback","allowSynchronousEvents","autoPong","maxPayload","skipUTF8Validation","perMessageDeflate","handleProtocols","clientTracking","verifyClient","noServer","backlog","server","host","path","port","TypeError","_server","createServer","req","res","body","STATUS_CODES","writeHead","length","end","listen","emitConnection","emit","bind","_removeListeners","addListeners","listening","error","upgrade","socket","head","handleUpgrade","clients","Set","_shouldEmitClose","_state","address","Error","close","cb","once","process","nextTick","emitClose","size","shouldHandle","index","url","indexOf","pathname","slice","on","socketOnError","key","headers","version","method","message","abortHandshakeOrEmitwsClientError","undefined","toLowerCase","test","abortHandshake","secWebSocketProtocol","protocols","parse","err","secWebSocketExtensions","extensions","offers","extensionName","accept","info","origin","secure","authorized","encrypted","verified","code","completeUpgrade","readable","writable","destroy","digest","update","ws","protocol","values","next","value","push","_protocol","params","format","_extensions","write","concat","join","removeListener","setSocket","add","delete","module","exports","map","event","Object","keys","removeListeners","Connection","Buffer","byteLength","h","listenerCount","captureStackTrace"],"sources":["/Users/shoofle/Projects/the-forest/node_modules/@libsql/isomorphic-ws/node_modules/ws/lib/websocket-server.js"],"sourcesContent":["/* eslint no-unused-vars: [\"error\", { \"varsIgnorePattern\": \"^Duplex$\", \"caughtErrors\": \"none\" }] */\n\n'use strict';\n\nconst EventEmitter = require('events');\nconst http = require('http');\nconst { Duplex } = require('stream');\nconst { createHash } = require('crypto');\n\nconst extension = require('./extension');\nconst PerMessageDeflate = require('./permessage-deflate');\nconst subprotocol = require('./subprotocol');\nconst WebSocket = require('./websocket');\nconst { GUID, kWebSocket } = require('./constants');\n\nconst keyRegex = /^[+/0-9A-Za-z]{22}==$/;\n\nconst RUNNING = 0;\nconst CLOSING = 1;\nconst CLOSED = 2;\n\n/**\n * Class representing a WebSocket server.\n *\n * @extends EventEmitter\n */\nclass WebSocketServer extends EventEmitter {\n /**\n * Create a `WebSocketServer` instance.\n *\n * @param {Object} options Configuration options\n * @param {Boolean} [options.allowSynchronousEvents=true] Specifies whether\n * any of the `'message'`, `'ping'`, and `'pong'` events can be emitted\n * multiple times in the same tick\n * @param {Boolean} [options.autoPong=true] Specifies whether or not to\n * automatically send a pong in response to a ping\n * @param {Number} [options.backlog=511] The maximum length of the queue of\n * pending connections\n * @param {Boolean} [options.clientTracking=true] Specifies whether or not to\n * track clients\n * @param {Function} [options.handleProtocols] A hook to handle protocols\n * @param {String} [options.host] The hostname where to bind the server\n * @param {Number} [options.maxPayload=104857600] The maximum allowed message\n * size\n * @param {Boolean} [options.noServer=false] Enable no server mode\n * @param {String} [options.path] Accept only connections matching this path\n * @param {(Boolean|Object)} [options.perMessageDeflate=false] Enable/disable\n * permessage-deflate\n * @param {Number} [options.port] The port where to bind the server\n * @param {(http.Server|https.Server)} [options.server] A pre-created HTTP/S\n * server to use\n * @param {Boolean} [options.skipUTF8Validation=false] Specifies whether or\n * not to skip UTF-8 validation for text and close messages\n * @param {Function} [options.verifyClient] A hook to reject connections\n * @param {Function} [options.WebSocket=WebSocket] Specifies the `WebSocket`\n * class to use. It must be the `WebSocket` class or class that extends it\n * @param {Function} [callback] A listener for the `listening` event\n */\n constructor(options, callback) {\n super();\n\n options = {\n allowSynchronousEvents: true,\n autoPong: true,\n maxPayload: 100 * 1024 * 1024,\n skipUTF8Validation: false,\n perMessageDeflate: false,\n handleProtocols: null,\n clientTracking: true,\n verifyClient: null,\n noServer: false,\n backlog: null, // use default (511 as implemented in net.js)\n server: null,\n host: null,\n path: null,\n port: null,\n WebSocket,\n ...options\n };\n\n if (\n (options.port == null && !options.server && !options.noServer) ||\n (options.port != null && (options.server || options.noServer)) ||\n (options.server && options.noServer)\n ) {\n throw new TypeError(\n 'One and only one of the \"port\", \"server\", or \"noServer\" options ' +\n 'must be specified'\n );\n }\n\n if (options.port != null) {\n this._server = http.createServer((req, res) => {\n const body = http.STATUS_CODES[426];\n\n res.writeHead(426, {\n 'Content-Length': body.length,\n 'Content-Type': 'text/plain'\n });\n res.end(body);\n });\n this._server.listen(\n options.port,\n options.host,\n options.backlog,\n callback\n );\n } else if (options.server) {\n this._server = options.server;\n }\n\n if (this._server) {\n const emitConnection = this.emit.bind(this, 'connection');\n\n this._removeListeners = addListeners(this._server, {\n listening: this.emit.bind(this, 'listening'),\n error: this.emit.bind(this, 'error'),\n upgrade: (req, socket, head) => {\n this.handleUpgrade(req, socket, head, emitConnection);\n }\n });\n }\n\n if (options.perMessageDeflate === true) options.perMessageDeflate = {};\n if (options.clientTracking) {\n this.clients = new Set();\n this._shouldEmitClose = false;\n }\n\n this.options = options;\n this._state = RUNNING;\n }\n\n /**\n * Returns the bound address, the address family name, and port of the server\n * as reported by the operating system if listening on an IP socket.\n * If the server is listening on a pipe or UNIX domain socket, the name is\n * returned as a string.\n *\n * @return {(Object|String|null)} The address of the server\n * @public\n */\n address() {\n if (this.options.noServer) {\n throw new Error('The server is operating in \"noServer\" mode');\n }\n\n if (!this._server) return null;\n return this._server.address();\n }\n\n /**\n * Stop the server from accepting new connections and emit the `'close'` event\n * when all existing connections are closed.\n *\n * @param {Function} [cb] A one-time listener for the `'close'` event\n * @public\n */\n close(cb) {\n if (this._state === CLOSED) {\n if (cb) {\n this.once('close', () => {\n cb(new Error('The server is not running'));\n });\n }\n\n process.nextTick(emitClose, this);\n return;\n }\n\n if (cb) this.once('close', cb);\n\n if (this._state === CLOSING) return;\n this._state = CLOSING;\n\n if (this.options.noServer || this.options.server) {\n if (this._server) {\n this._removeListeners();\n this._removeListeners = this._server = null;\n }\n\n if (this.clients) {\n if (!this.clients.size) {\n process.nextTick(emitClose, this);\n } else {\n this._shouldEmitClose = true;\n }\n } else {\n process.nextTick(emitClose, this);\n }\n } else {\n const server = this._server;\n\n this._removeListeners();\n this._removeListeners = this._server = null;\n\n //\n // The HTTP/S server was created internally. Close it, and rely on its\n // `'close'` event.\n //\n server.close(() => {\n emitClose(this);\n });\n }\n }\n\n /**\n * See if a given request should be handled by this server instance.\n *\n * @param {http.IncomingMessage} req Request object to inspect\n * @return {Boolean} `true` if the request is valid, else `false`\n * @public\n */\n shouldHandle(req) {\n if (this.options.path) {\n const index = req.url.indexOf('?');\n const pathname = index !== -1 ? req.url.slice(0, index) : req.url;\n\n if (pathname !== this.options.path) return false;\n }\n\n return true;\n }\n\n /**\n * Handle a HTTP Upgrade request.\n *\n * @param {http.IncomingMessage} req The request object\n * @param {Duplex} socket The network socket between the server and client\n * @param {Buffer} head The first packet of the upgraded stream\n * @param {Function} cb Callback\n * @public\n */\n handleUpgrade(req, socket, head, cb) {\n socket.on('error', socketOnError);\n\n const key = req.headers['sec-websocket-key'];\n const upgrade = req.headers.upgrade;\n const version = +req.headers['sec-websocket-version'];\n\n if (req.method !== 'GET') {\n const message = 'Invalid HTTP method';\n abortHandshakeOrEmitwsClientError(this, req, socket, 405, message);\n return;\n }\n\n if (upgrade === undefined || upgrade.toLowerCase() !== 'websocket') {\n const message = 'Invalid Upgrade header';\n abortHandshakeOrEmitwsClientError(this, req, socket, 400, message);\n return;\n }\n\n if (key === undefined || !keyRegex.test(key)) {\n const message = 'Missing or invalid Sec-WebSocket-Key header';\n abortHandshakeOrEmitwsClientError(this, req, socket, 400, message);\n return;\n }\n\n if (version !== 8 && version !== 13) {\n const message = 'Missing or invalid Sec-WebSocket-Version header';\n abortHandshakeOrEmitwsClientError(this, req, socket, 400, message);\n return;\n }\n\n if (!this.shouldHandle(req)) {\n abortHandshake(socket, 400);\n return;\n }\n\n const secWebSocketProtocol = req.headers['sec-websocket-protocol'];\n let protocols = new Set();\n\n if (secWebSocketProtocol !== undefined) {\n try {\n protocols = subprotocol.parse(secWebSocketProtocol);\n } catch (err) {\n const message = 'Invalid Sec-WebSocket-Protocol header';\n abortHandshakeOrEmitwsClientError(this, req, socket, 400, message);\n return;\n }\n }\n\n const secWebSocketExtensions = req.headers['sec-websocket-extensions'];\n const extensions = {};\n\n if (\n this.options.perMessageDeflate &&\n secWebSocketExtensions !== undefined\n ) {\n const perMessageDeflate = new PerMessageDeflate(\n this.options.perMessageDeflate,\n true,\n this.options.maxPayload\n );\n\n try {\n const offers = extension.parse(secWebSocketExtensions);\n\n if (offers[PerMessageDeflate.extensionName]) {\n perMessageDeflate.accept(offers[PerMessageDeflate.extensionName]);\n extensions[PerMessageDeflate.extensionName] = perMessageDeflate;\n }\n } catch (err) {\n const message =\n 'Invalid or unacceptable Sec-WebSocket-Extensions header';\n abortHandshakeOrEmitwsClientError(this, req, socket, 400, message);\n return;\n }\n }\n\n //\n // Optionally call external client verification handler.\n //\n if (this.options.verifyClient) {\n const info = {\n origin:\n req.headers[`${version === 8 ? 'sec-websocket-origin' : 'origin'}`],\n secure: !!(req.socket.authorized || req.socket.encrypted),\n req\n };\n\n if (this.options.verifyClient.length === 2) {\n this.options.verifyClient(info, (verified, code, message, headers) => {\n if (!verified) {\n return abortHandshake(socket, code || 401, message, headers);\n }\n\n this.completeUpgrade(\n extensions,\n key,\n protocols,\n req,\n socket,\n head,\n cb\n );\n });\n return;\n }\n\n if (!this.options.verifyClient(info)) return abortHandshake(socket, 401);\n }\n\n this.completeUpgrade(extensions, key, protocols, req, socket, head, cb);\n }\n\n /**\n * Upgrade the connection to WebSocket.\n *\n * @param {Object} extensions The accepted extensions\n * @param {String} key The value of the `Sec-WebSocket-Key` header\n * @param {Set} protocols The subprotocols\n * @param {http.IncomingMessage} req The request object\n * @param {Duplex} socket The network socket between the server and client\n * @param {Buffer} head The first packet of the upgraded stream\n * @param {Function} cb Callback\n * @throws {Error} If called more than once with the same socket\n * @private\n */\n completeUpgrade(extensions, key, protocols, req, socket, head, cb) {\n //\n // Destroy the socket if the client has already sent a FIN packet.\n //\n if (!socket.readable || !socket.writable) return socket.destroy();\n\n if (socket[kWebSocket]) {\n throw new Error(\n 'server.handleUpgrade() was called more than once with the same ' +\n 'socket, possibly due to a misconfiguration'\n );\n }\n\n if (this._state > RUNNING) return abortHandshake(socket, 503);\n\n const digest = createHash('sha1')\n .update(key + GUID)\n .digest('base64');\n\n const headers = [\n 'HTTP/1.1 101 Switching Protocols',\n 'Upgrade: websocket',\n 'Connection: Upgrade',\n `Sec-WebSocket-Accept: ${digest}`\n ];\n\n const ws = new this.options.WebSocket(null, undefined, this.options);\n\n if (protocols.size) {\n //\n // Optionally call external protocol selection handler.\n //\n const protocol = this.options.handleProtocols\n ? this.options.handleProtocols(protocols, req)\n : protocols.values().next().value;\n\n if (protocol) {\n headers.push(`Sec-WebSocket-Protocol: ${protocol}`);\n ws._protocol = protocol;\n }\n }\n\n if (extensions[PerMessageDeflate.extensionName]) {\n const params = extensions[PerMessageDeflate.extensionName].params;\n const value = extension.format({\n [PerMessageDeflate.extensionName]: [params]\n });\n headers.push(`Sec-WebSocket-Extensions: ${value}`);\n ws._extensions = extensions;\n }\n\n //\n // Allow external modification/inspection of handshake headers.\n //\n this.emit('headers', headers, req);\n\n socket.write(headers.concat('\\r\\n').join('\\r\\n'));\n socket.removeListener('error', socketOnError);\n\n ws.setSocket(socket, head, {\n allowSynchronousEvents: this.options.allowSynchronousEvents,\n maxPayload: this.options.maxPayload,\n skipUTF8Validation: this.options.skipUTF8Validation\n });\n\n if (this.clients) {\n this.clients.add(ws);\n ws.on('close', () => {\n this.clients.delete(ws);\n\n if (this._shouldEmitClose && !this.clients.size) {\n process.nextTick(emitClose, this);\n }\n });\n }\n\n cb(ws, req);\n }\n}\n\nmodule.exports = WebSocketServer;\n\n/**\n * Add event listeners on an `EventEmitter` using a map of <event, listener>\n * pairs.\n *\n * @param {EventEmitter} server The event emitter\n * @param {Object.<String, Function>} map The listeners to add\n * @return {Function} A function that will remove the added listeners when\n * called\n * @private\n */\nfunction addListeners(server, map) {\n for (const event of Object.keys(map)) server.on(event, map[event]);\n\n return function removeListeners() {\n for (const event of Object.keys(map)) {\n server.removeListener(event, map[event]);\n }\n };\n}\n\n/**\n * Emit a `'close'` event on an `EventEmitter`.\n *\n * @param {EventEmitter} server The event emitter\n * @private\n */\nfunction emitClose(server) {\n server._state = CLOSED;\n server.emit('close');\n}\n\n/**\n * Handle socket errors.\n *\n * @private\n */\nfunction socketOnError() {\n this.destroy();\n}\n\n/**\n * Close the connection when preconditions are not fulfilled.\n *\n * @param {Duplex} socket The socket of the upgrade request\n * @param {Number} code The HTTP response status code\n * @param {String} [message] The HTTP response body\n * @param {Object} [headers] Additional HTTP response headers\n * @private\n */\nfunction abortHandshake(socket, code, message, headers) {\n //\n // The socket is writable unless the user destroyed or ended it before calling\n // `server.handleUpgrade()` or in the `verifyClient` function, which is a user\n // error. Handling this does not make much sense as the worst that can happen\n // is that some of the data written by the user might be discarded due to the\n // call to `socket.end()` below, which triggers an `'error'` event that in\n // turn causes the socket to be destroyed.\n //\n message = message || http.STATUS_CODES[code];\n headers = {\n Connection: 'close',\n 'Content-Type': 'text/html',\n 'Content-Length': Buffer.byteLength(message),\n ...headers\n };\n\n socket.once('finish', socket.destroy);\n\n socket.end(\n `HTTP/1.1 ${code} ${http.STATUS_CODES[code]}\\r\\n` +\n Object.keys(headers)\n .map((h) => `${h}: ${headers[h]}`)\n .join('\\r\\n') +\n '\\r\\n\\r\\n' +\n message\n );\n}\n\n/**\n * Emit a `'wsClientError'` event on a `WebSocketServer` if there is at least\n * one listener for it, otherwise call `abortHandshake()`.\n *\n * @param {WebSocketServer} server The WebSocket server\n * @param {http.IncomingMessage} req The request object\n * @param {Duplex} socket The socket of the upgrade request\n * @param {Number} code The HTTP response status code\n * @param {String} message The HTTP response body\n * @private\n */\nfunction abortHandshakeOrEmitwsClientError(server, req, socket, code, message) {\n if (server.listenerCount('wsClientError')) {\n const err = new Error(message);\n Error.captureStackTrace(err, abortHandshakeOrEmitwsClientError);\n\n server.emit('wsClientError', err, socket, req);\n } else {\n abortHandshake(socket, code, message);\n 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