How to autowire the service inside authentication filter in Spring

How to autowire the service inside authentication filter in Spring

To autowire a service inside an authentication filter in Spring, you can follow these steps:

  • Create a custom authentication filter by extending the UsernamePasswordAuthenticationFilter class or implementing the Filter interface. This filter will be responsible for processing authentication requests.

  • Use Spring's dependency injection (@Autowired) to inject the service you need inside the custom filter class.

  • Register the custom authentication filter in your Spring Security configuration.

Here's an example of how to do this:

  • Create a custom authentication filter by extending UsernamePasswordAuthenticationFilter (or implementing Filter) and inject the service you need:
import org.springframework.beans.factory.annotation.Autowired; import org.springframework.security.authentication.AuthenticationManager; import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter; import org.springframework.stereotype.Component; @Component public class CustomAuthenticationFilter extends UsernamePasswordAuthenticationFilter { @Autowired private CustomAuthService customAuthService; public CustomAuthenticationFilter(AuthenticationManager authenticationManager) { setAuthenticationManager(authenticationManager); } // Override methods and handle authentication logic as needed. }

In the code above:

  • CustomAuthenticationFilter extends UsernamePasswordAuthenticationFilter to provide custom authentication logic.
  • The @Autowired annotation is used to inject the CustomAuthService (or your custom service) into the filter.
  • The AuthenticationManager is injected via the constructor to set it in the parent class.
  • Configure the custom filter in your Spring Security configuration:
import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.security.authentication.AuthenticationManager; import org.springframework.security.config.annotation.web.builders.HttpSecurity; import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity; import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter; @Configuration @EnableWebSecurity public class SecurityConfig extends WebSecurityConfigurerAdapter { @Autowired private CustomAuthenticationFilter customAuthenticationFilter; @Override protected void configure(HttpSecurity http) throws Exception { http .addFilterBefore(customAuthenticationFilter, UsernamePasswordAuthenticationFilter.class) // Other security configurations... .authorizeRequests() .antMatchers("/public/**").permitAll() .antMatchers("/private/**").authenticated() // Configure other authorization rules... .and() .formLogin() // Configure form login... .and() .logout() // Configure logout... .and() .csrf().disable(); // Disable CSRF for simplicity; enable it in production } @Bean @Override public AuthenticationManager authenticationManagerBean() throws Exception { return super.authenticationManagerBean(); } }

In the code above:

  • CustomAuthenticationFilter is injected into the security configuration using the @Autowired annotation.

  • The addFilterBefore method is used to register the custom filter before the default UsernamePasswordAuthenticationFilter. You can adjust the filter order as needed.

  • Other security configurations and authorization rules are added as required.

Make sure you replace CustomAuthService and CustomAuthenticationFilter with the actual names of your custom service and filter.

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