backend: added registration validation && added rate limitter

[kirtiraj22]

Enhancements to User Registration Endpoint

Description

• Added input validation middleware to validate user inputs during registration(using express-validator).
• Implemented rate limiting using express-rate-limit (to solve the CodeQL Missing rate limiting error of the previous PR)
• Fixed a minor typo in the login endpoint.

Changes Made

1. Created validation.js middleware for input validation during user registration.
2. Added express-rate-limit package to implement rate limiting.
3. Created registerLimiter.js middleware. (allow a maximum of 20 requests per 15 minutes for the registration endpoint.)

Checklist

• Input validation middleware added.
• Rate limiting implemented for the registration endpoint.
• Typo fixed in the login endpoint.

Screenshots

• Manually tested the registration endpoint with various input scenarios to ensure proper validation.

Please review and let me know if you require any changes further.

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Name	Status	Preview	Comments	Updated (UTC)
doodle-collab	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 19, 2024 5:35pm

[kirtiraj22]

also, currently the rate limiter allows 20 requests per 15 minutes, but if you want to increase or decrease the number of requests then you can modify the rateLimitter.js middleware, i.e :

const registerLimiter = rateLimit({
  windowMs: 15 * 60 * 1000,
  max: 20,        // change the number to increase/decrease the number of requests per 15 minutes 
});

[kirtiraj22]

lastly, If the PR is good enough to get merged, then can you kindly put the IWOC2024 label?

[ItsRoy69]

LGTM