Added rate limit

alexa/alexa-adapter.js

@@ -60,6 +60,7 @@ module.exports = function (RED) {
     const util = require('util');
     const TokenGenerator = require('uuid-token-generator');
     const express = require('express');
+    const expressRateLimit = require("express-rate-limit");
     const helmet = require('helmet');
     const morgan = require('morgan');
     const cors = require('cors');
@@ -260,7 +261,15 @@ module.exports = function (RED) {
             const node = this;
             if (node.verbose) node._debug("startServer port " + node.http_port);
             const app = express();
+            const rate_limit = 30;
+            const rateLimitMiddleware = expressRateLimit({
+                windowMs: 60 * 1000,
+                max: rate_limit,
+                message: `You have exceeded your ${rate_limit} requests per minute limit.`,
+                headers: true,
+              });
             app.disable('x-powered-by');
+            app.use(rateLimitMiddleware);
             app.use(helmet());
             app.use(cors());
             app.use(morgan('dev'));

package.json

@@ -1,6 +1,6 @@
 {
   "name": "node-red-contrib-alexa-virtual-smarthome",
-  "version": "0.0.35",
+  "version": "0.0.36",
   "description": "Node Red Alexa Smarthome node",
   "main": "index.js",
   "scripts": {
@@ -48,6 +48,7 @@
     "ask-sdk-model": "^1.86.0",
     "cors": "^2.8.5",
     "express": "^4.19.2",
+    "express-rate-limiter": "^1.3.1",
     "helmet": "^7.1.0",
     "morgan": "^1.10.0",
     "stoppable": "^1.1.0",