Can you tell about the authentication and authorization mechanism used in your last project?

In my latest Java project, a classic authentication and authorization scheme using JWT (JSON Web Token) was employed.

1. The user enters their login and password.
2. The server verifies the data, and if correct, generates a JWT with user information and an expiration time.
3. The client saves the token and sends it in the Authorization header for subsequent requests.
4. The server checks the token's validity and access rights to resources.

This approach allows separating authentication from session state and scaling the application.

Example of token validation using the jjwt library:

Claims claims = Jwts.parser()
    .setSigningKey(secretKey)
    .parseClaimsJws(token)
    .getBody();
String username = claims.getSubject();

Thus, authentication is the verification of the user's identity, and authorization is the verification of their rights to perform actions.