add rate limiting

Author: Nelson-numerical-software

README.md

@@ -1,4 +1,5 @@
 # ☁️nelson-cloud
+
 ![Build Status](https://github.com/Nelson-numerical-software/nelson-cloud/workflows/Node.js%20CI/badge.svg)
 [![code style: prettier](https://img.shields.io/badge/code_style-prettier-ff69b4.svg?style=flat-square)](https://github.com/prettier/prettier)
 [![GitHub license](https://img.shields.io/badge/license-GPL2-blue.svg)](https://github.com/Nelson-numerical-software/nelson-cloud/blob/master/COPYING.md)

lib/nelsonSocketIO.js

@@ -27,14 +27,21 @@ const app = express();
 const child_process = require('child_process');
 const findFreePort = require('find-free-port');
 const nelsonProcess = require('./nelsonProcess');
+const RateLimit = require('express-rate-limit');
 //=============================================================================
 function nelsonSocketIO() {
   const server = http.Server(app);
   const io = socketio(server);
   //=============================================================================
   server.listen(CONFIGURATION.PORT);
   //=============================================================================
+  const limiter = new RateLimit({
+    windowMs: 1 * 60 * 1000, // 1 minute
+    max: 50,
+  });
+  //=============================================================================
   app.use(express.static(__dirname + '/../resources'));
+  app.use(limiter);
   app.get('/', function (req, res) {
     res.sendFile(__dirname + '/resources/index.html');
   });

package-lock.json

@@ -48,6 +48,7 @@
   "dependencies": {
     "child_process": "1.0.2",
     "express": "4.17.1",
+    "express-rate-limit": "5.2.3",
     "find-free-port": "2.0.0",
     "ip": "1.1.5",
     "socket.io": "3.1.0",