Version: 2.2.0 (última)

Limitar las Solicitudes Repetidas

To avoid brute force attacks or overloading your application, you can set up a rate limiter to limit the number of requests a user can send to your application.

Basic Example#

Foal does not provide a built-in utility for this, but you can use the express-rate-limit package to handle it.

npm install express express-rate-limit

src/index.ts

// std
import * as http from 'http';
// 3p
import { Config, createApp, displayServerURL } from '@foal/core';
import * as express from 'express';
import * as rateLimit from 'express-rate-limit';
// App
import { AppController } from './app/app.controller';
async function main() {
const expressApp = express();
expressApp.use(rateLimit({
// Limit each IP to 100 requests per windowMs
max: 100,
// 15 minutes
windowMs: 15 * 60 * 1000,
handler (req, res, next) {
// Set default FoalTS headers to the response of limited requests
res.removeHeader('X-Powered-By');
res.setHeader('X-Content-Type-Options', 'nosniff');
res.setHeader('X-Frame-Options', 'SAMEORIGIN');
res.setHeader('X-XSS-Protection', '1; mode=block');
res.setHeader('Strict-Transport-Security', 'max-age=15552000; includeSubDomains');
// Send the response with the default statusCode and message from rateLimit
res.status(this.statusCode || 429).send(this.message);
}
}));
const app = await createApp(AppController, { expressInstance: expressApp });
const httpServer = http.createServer(app);
const port = Config.get('port', 'number', 3001);
httpServer.listen(port, () => displayServerURL(port));
}
main()
.catch(err => { console.error(err.stack); process.exit(1); });

Usage with CORS#

In case your application needs to allow CORS requests, you can also update your index.ts as follows.

expressApp.use(rateLimit({
max: 100,
windowMs: 15 * 60 * 1000,
handler (req, res, next) {
res.removeHeader('X-Powered-By');
res.setHeader('X-Content-Type-Options', 'nosniff');
res.setHeader('X-Frame-Options', 'SAMEORIGIN');
res.setHeader('X-XSS-Protection', '1; mode=block');
res.setHeader('Strict-Transport-Security', 'max-age=15552000; includeSubDomains');
// Set CORS headers
res.setHeader('Access-Control-Allow-Origin', '*');
if (req.method === 'OPTIONS') {
// You may want to allow other headers depending on what you need (Authorization, etc).
res.setHeader('Access-Control-Allow-Headers', 'Content-Type');
res.setHeader('Access-Control-Allow-Methods', 'HEAD, GET, POST, PUT, PATCH, DELETE');
}
res.status(this.statusCode || 429).send(this.message);
}
}));