1 | 'use strict';
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2 |
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3 | const EventEmitter = require('events');
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4 | const crypto = require('crypto');
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5 | const http = require('http');
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6 |
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7 | const PerMessageDeflate = require('./permessage-deflate');
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8 | const extension = require('./extension');
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9 | const constants = require('./constants');
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10 | const WebSocket = require('./websocket');
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11 |
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12 |
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13 |
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14 |
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15 |
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16 |
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17 | class WebSocketServer extends EventEmitter {
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18 | |
19 |
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20 |
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21 |
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22 |
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23 |
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24 |
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25 |
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26 |
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27 |
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28 |
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29 |
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30 |
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31 |
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32 |
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33 |
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34 | constructor (options, callback) {
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35 | super();
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36 |
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37 | options = Object.assign({
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38 | maxPayload: 100 * 1024 * 1024,
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39 | perMessageDeflate: false,
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40 | handleProtocols: null,
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41 | clientTracking: true,
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42 | verifyClient: null,
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43 | noServer: false,
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44 | backlog: null,
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45 | server: null,
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46 | host: null,
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47 | path: null,
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48 | port: null
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49 | }, options);
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50 |
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51 | if (options.port == null && !options.server && !options.noServer) {
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52 | throw new TypeError(
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53 | 'One of the "port", "server", or "noServer" options must be specified'
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54 | );
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55 | }
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56 |
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57 | if (options.port != null) {
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58 | this._server = http.createServer((req, res) => {
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59 | const body = http.STATUS_CODES[426];
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60 |
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61 | res.writeHead(426, {
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62 | 'Content-Length': body.length,
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63 | 'Content-Type': 'text/plain'
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64 | });
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65 | res.end(body);
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66 | });
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67 | this._server.listen(options.port, options.host, options.backlog, callback);
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68 | } else if (options.server) {
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69 | this._server = options.server;
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70 | }
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71 |
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72 | if (this._server) {
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73 | this._removeListeners = addListeners(this._server, {
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74 | listening: this.emit.bind(this, 'listening'),
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75 | error: this.emit.bind(this, 'error'),
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76 | upgrade: (req, socket, head) => {
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77 | this.handleUpgrade(req, socket, head, (ws) => {
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78 | this.emit('connection', ws, req);
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79 | });
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80 | }
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81 | });
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82 | }
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83 |
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84 | if (options.perMessageDeflate === true) options.perMessageDeflate = {};
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85 | if (options.clientTracking) this.clients = new Set();
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86 | this.options = options;
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87 | }
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88 |
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89 | |
90 |
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91 |
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92 |
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93 |
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94 |
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95 |
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96 |
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97 |
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98 | address () {
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99 | if (this.options.noServer) {
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100 | throw new Error('The server is operating in "noServer" mode');
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101 | }
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102 |
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103 | if (!this._server) return null;
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104 | return this._server.address();
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105 | }
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106 |
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107 | |
108 |
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109 |
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110 |
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111 |
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112 |
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113 | close (cb) {
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114 | if (cb) this.once('close', cb);
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115 |
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116 |
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117 |
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118 |
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119 | if (this.clients) {
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120 | for (const client of this.clients) client.terminate();
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121 | }
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122 |
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123 | const server = this._server;
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124 |
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125 | if (server) {
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126 | this._removeListeners();
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127 | this._removeListeners = this._server = null;
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128 |
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129 |
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130 |
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131 |
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132 | if (this.options.port != null) {
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133 | server.close(() => this.emit('close'));
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134 | return;
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135 | }
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136 | }
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137 |
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138 | process.nextTick(emitClose, this);
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139 | }
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140 |
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141 | |
142 |
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143 |
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144 |
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145 |
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146 |
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147 |
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148 | shouldHandle (req) {
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149 | if (this.options.path) {
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150 | const index = req.url.indexOf('?');
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151 | const pathname = index !== -1 ? req.url.slice(0, index) : req.url;
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152 |
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153 | if (pathname !== this.options.path) return false;
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154 | }
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155 |
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156 | return true;
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157 | }
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158 |
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159 | |
160 |
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161 |
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162 |
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163 |
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164 |
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165 |
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166 |
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167 |
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168 | handleUpgrade (req, socket, head, cb) {
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169 | socket.on('error', socketOnError);
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170 |
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171 | const version = +req.headers['sec-websocket-version'];
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172 | const extensions = {};
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173 |
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174 | if (
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175 | req.method !== 'GET' || req.headers.upgrade.toLowerCase() !== 'websocket' ||
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176 | !req.headers['sec-websocket-key'] || (version !== 8 && version !== 13) ||
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177 | !this.shouldHandle(req)
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178 | ) {
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179 | return abortHandshake(socket, 400);
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180 | }
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181 |
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182 | if (this.options.perMessageDeflate) {
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183 | const perMessageDeflate = new PerMessageDeflate(
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184 | this.options.perMessageDeflate,
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185 | true,
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186 | this.options.maxPayload
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187 | );
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188 |
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189 | try {
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190 | const offers = extension.parse(
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191 | req.headers['sec-websocket-extensions']
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192 | );
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193 |
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194 | if (offers[PerMessageDeflate.extensionName]) {
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195 | perMessageDeflate.accept(offers[PerMessageDeflate.extensionName]);
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196 | extensions[PerMessageDeflate.extensionName] = perMessageDeflate;
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197 | }
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198 | } catch (err) {
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199 | return abortHandshake(socket, 400);
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200 | }
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201 | }
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202 |
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203 |
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204 |
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205 |
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206 | if (this.options.verifyClient) {
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207 | const info = {
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208 | origin: req.headers[`${version === 8 ? 'sec-websocket-origin' : 'origin'}`],
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209 | secure: !!(req.connection.authorized || req.connection.encrypted),
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210 | req
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211 | };
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212 |
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213 | if (this.options.verifyClient.length === 2) {
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214 | this.options.verifyClient(info, (verified, code, message, headers) => {
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215 | if (!verified) {
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216 | return abortHandshake(socket, code || 401, message, headers);
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217 | }
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218 |
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219 | this.completeUpgrade(extensions, req, socket, head, cb);
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220 | });
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221 | return;
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222 | }
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223 |
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224 | if (!this.options.verifyClient(info)) return abortHandshake(socket, 401);
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225 | }
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226 |
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227 | this.completeUpgrade(extensions, req, socket, head, cb);
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228 | }
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229 |
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230 | |
231 |
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232 |
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233 |
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234 |
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235 |
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236 |
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237 |
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238 |
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239 |
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240 | completeUpgrade (extensions, req, socket, head, cb) {
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241 |
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242 |
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243 |
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244 | if (!socket.readable || !socket.writable) return socket.destroy();
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245 |
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246 | const key = crypto.createHash('sha1')
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247 | .update(req.headers['sec-websocket-key'] + constants.GUID, 'binary')
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248 | .digest('base64');
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249 |
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250 | const headers = [
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251 | 'HTTP/1.1 101 Switching Protocols',
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252 | 'Upgrade: websocket',
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253 | 'Connection: Upgrade',
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254 | `Sec-WebSocket-Accept: ${key}`
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255 | ];
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256 |
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257 | const ws = new WebSocket(null);
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258 | var protocol = req.headers['sec-websocket-protocol'];
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259 |
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260 | if (protocol) {
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261 | protocol = protocol.trim().split(/ *, */);
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262 |
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263 |
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264 |
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265 |
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266 | if (this.options.handleProtocols) {
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267 | protocol = this.options.handleProtocols(protocol, req);
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268 | } else {
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269 | protocol = protocol[0];
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270 | }
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271 |
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272 | if (protocol) {
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273 | headers.push(`Sec-WebSocket-Protocol: ${protocol}`);
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274 | ws.protocol = protocol;
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275 | }
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276 | }
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277 |
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278 | if (extensions[PerMessageDeflate.extensionName]) {
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279 | const params = extensions[PerMessageDeflate.extensionName].params;
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280 | const value = extension.format({
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281 | [PerMessageDeflate.extensionName]: [params]
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282 | });
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283 | headers.push(`Sec-WebSocket-Extensions: ${value}`);
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284 | ws._extensions = extensions;
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285 | }
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286 |
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287 |
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288 |
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289 |
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290 | this.emit('headers', headers, req);
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291 |
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292 | socket.write(headers.concat('\r\n').join('\r\n'));
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293 | socket.removeListener('error', socketOnError);
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294 |
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295 | ws.setSocket(socket, head, this.options.maxPayload);
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296 |
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297 | if (this.clients) {
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298 | this.clients.add(ws);
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299 | ws.on('close', () => this.clients.delete(ws));
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300 | }
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301 |
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302 | cb(ws);
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303 | }
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304 | }
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305 |
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306 | module.exports = WebSocketServer;
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307 |
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308 |
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309 |
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310 |
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311 |
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312 |
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313 |
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314 |
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315 |
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316 |
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317 | function addListeners (server, map) {
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318 | for (const event of Object.keys(map)) server.on(event, map[event]);
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319 |
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320 | return function removeListeners () {
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321 | for (const event of Object.keys(map)) {
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322 | server.removeListener(event, map[event]);
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323 | }
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324 | };
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325 | }
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326 |
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327 |
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328 |
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329 |
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330 |
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331 |
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332 |
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333 | function emitClose (server) {
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334 | server.emit('close');
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335 | }
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336 |
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337 |
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338 |
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339 |
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340 |
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341 |
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342 | function socketOnError () {
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343 | this.destroy();
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344 | }
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345 |
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346 |
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347 |
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348 |
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349 |
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350 |
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351 |
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352 |
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353 |
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354 |
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355 | function abortHandshake (socket, code, message, headers) {
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356 | if (socket.writable) {
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357 | message = message || http.STATUS_CODES[code];
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358 | headers = Object.assign({
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359 | 'Connection': 'close',
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360 | 'Content-type': 'text/html',
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361 | 'Content-Length': Buffer.byteLength(message)
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362 | }, headers);
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363 |
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364 | socket.write(
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365 | `HTTP/1.1 ${code} ${http.STATUS_CODES[code]}\r\n` +
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366 | Object.keys(headers).map(h => `${h}: ${headers[h]}`).join('\r\n') +
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367 | '\r\n\r\n' +
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368 | message
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369 | );
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370 | }
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371 |
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372 | socket.removeListener('error', socketOnError);
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373 | socket.destroy();
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374 | }
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