configure JWT on Springboot

To configure JWT on Spring Boot, you can follow the steps below:

  1. Add Dependencies: In your project's pom.xml file, add the required dependencies for JWT. This typically includes the Spring Security and JWT libraries. You can use Maven or Gradle to manage your dependencies.

  2. Configure Security: Create a class that extends the WebSecurityConfigurerAdapter provided by Spring Security. Override the configure(HttpSecurity http) method to define the security configurations for your application. Inside this method, you can specify the endpoints that require authentication and authorization.

  3. Create User Details Service: Implement the UserDetailsService interface provided by Spring Security. This interface is responsible for loading user-specific data during authentication. You can create a custom implementation that retrieves user details from a database or any other authentication source.

  4. Implement JWT Authentication Filter: Create a class that extends the OncePerRequestFilter class provided by Spring Security. Override the doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) method to handle JWT authentication. In this method, extract the JWT token from the request header, validate it, and set the authentication in the SecurityContext.

  5. Generate JWT Token: Create a class that is responsible for generating JWT tokens. This class should have methods to generate a token based on user details, validate a token, and extract user details from a token.

  6. Configure Authentication Manager: Override the configure(AuthenticationManagerBuilder auth) method in your WebSecurityConfigurerAdapter class to configure the AuthenticationManager. Use your UserDetailsService implementation and password encoder (if applicable) to authenticate users.

  7. Configure JWT Authorization: Create a class that extends the AbstractAuthorizationServerConfigurer provided by Spring Security. Override the configure(AuthorizationServerEndpointsConfigurer endpoints) method to configure the JWT token store and authentication manager.

  8. Configure Token Endpoint: Override the configure(ClientDetailsServiceConfigurer clients) method in your AuthorizationServerConfigurer class to configure the token endpoint. Set the token store and authentication manager.

  9. Test JWT Authentication: Test your JWT authentication by sending a request to an authenticated endpoint with a valid JWT token. Ensure that the request is successful and the token is validated.

By following these steps, you can configure JWT on Spring Boot and enable secure authentication and authorization in your application.