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'use strict';
const session = require('express-session');
const express = require('express');
const http = require('http');
const uuid = require('uuid');
const { WebSocketServer } = require('../..');
const app = express();
const map = new Map();
//
// We need the same instance of the session parser in express and
// WebSocket server.
//
const sessionParser = session({
saveUninitialized: false,
secret: '$eCuRiTy',
resave: false
});
//
// Serve static files from the 'public' folder.
//
app.use(express.static('public'));
app.use(sessionParser);
app.post('/login', function (req, res) {
//
// "Log in" user and set userId to session.
//
const id = uuid.v4();
console.log(`Updating session for user ${id}`);
req.session.userId = id;
res.send({ result: 'OK', message: 'Session updated' });
});
app.delete('/logout', function (request, response) {
const ws = map.get(request.session.userId);
console.log('Destroying session');
request.session.destroy(function () {
if (ws) ws.close();
response.send({ result: 'OK', message: 'Session destroyed' });
});
});
//
// Create an HTTP server.
//
const server = http.createServer(app);
//
// Create a WebSocket server completely detached from the HTTP server.
//
const wss = new WebSocketServer({ clientTracking: false, noServer: true });
server.on('upgrade', function (request, socket, head) {
console.log('Parsing session from request...');
sessionParser(request, {}, () => {
if (!request.session.userId) {
socket.write('HTTP/1.1 401 Unauthorized\r\n\r\n');
socket.destroy();
return;
}
console.log('Session is parsed!');
wss.handleUpgrade(request, socket, head, function (ws) {
wss.emit('connection', ws, request);
});
});
});
wss.on('connection', function (ws, request) {
const userId = request.session.userId;
map.set(userId, ws);
ws.on('message', function (message) {
//
// Here we can now use session parameters.
//
console.log(`Received message ${message} from user ${userId}`);
});
ws.on('close', function () {
map.delete(userId);
});
});
//
// Start the server.
//
server.listen(8080, function () {
console.log('Listening on http://localhost:8080');
});
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