/** * Copyright 2019 Google Inc. All Rights Reserved. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * http://www.apache.org/licenses/LICENSE-2.0 * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import { Socket } from 'net'; import { STATUS_CODES } from 'http'; import WebSocket, { Server as WebSocketServer } from 'ws'; import { RequestHandler } from 'express'; import { origin } from './config'; export function abortHandshake( socket: Socket, code: number, message: string = STATUS_CODES[code] || 'unknown', headers: { [headerName: string]: string } = {}, ) { if (socket.writable) { headers = { Connection: 'close', 'Content-type': 'text/html', 'Content-Length': Buffer.byteLength(message).toString(), ...headers, }; socket.write( `HTTP/1.1 ${code} ${STATUS_CODES[code]}\r\n` + Object.keys(headers) .map(h => `${h}: ${headers[h]}`) .join('\r\n') + '\r\n\r\n' + message, ); } socket.destroy(); } export function pingClients(wss: WebSocketServer) { const aliveClients = new WeakSet<WebSocket>(); wss.on('connection', ws => { aliveClients.add(ws); ws.on('pong', () => { aliveClients.add(ws); }); }); setInterval(() => { for (const client of wss.clients) { if (!aliveClients.has(client)) return client.terminate(); aliveClients.delete(client); client.ping(); } }, 30000); } export function requireSameOrigin(): RequestHandler { return (req, res, next) => { const reqOrigin = req.headers['origin']; if (reqOrigin !== origin) { res.status(403).json({ err: 'Request must be same origin' }); return; } next(); }; }