Custom spring security filter called at runtime

Custom spring security filter called at runtime

To create a custom Spring Security filter that is called at runtime, you'll need to follow several steps. This includes creating the filter, configuring it within the Spring Security configuration, and ensuring it's properly integrated into the security filter chain. Here's a detailed guide to help you set up and use a custom filter in Spring Security:

1. Create the Custom Filter

First, you need to create a custom filter by implementing the Filter interface or extending an existing filter class such as OncePerRequestFilter.

Example Custom Filter

import javax.servlet.FilterChain; import javax.servlet.FilterConfig; import javax.servlet.ServletException; import javax.servlet.ServletRequest; import javax.servlet.ServletResponse; import javax.servlet.http.HttpServletRequest; import java.io.IOException; import org.springframework.web.filter.OncePerRequestFilter; public class MyCustomFilter extends OncePerRequestFilter { @Override protected void doFilterInternal(HttpServletRequest request, javax.servlet.http.HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException { // Custom filtering logic here System.out.println("Custom filter is called"); // Continue the request-response chain filterChain.doFilter(request, response); } @Override public void init(FilterConfig filterConfig) throws ServletException { // Initialization code here, if needed } @Override public void destroy() { // Cleanup code here, if needed } }

2. Register the Custom Filter

You need to register your custom filter within the Spring Security configuration. This is typically done by extending WebSecurityConfigurerAdapter and overriding the configure method.

Example Spring Security Configuration

import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; 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; import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter; @Configuration @EnableWebSecurity public class SecurityConfig extends WebSecurityConfigurerAdapter { @Override protected void configure(HttpSecurity http) throws Exception { http // Add your custom filter before or after specific filters .addFilterBefore(myCustomFilter(), UsernamePasswordAuthenticationFilter.class) // Other security configurations .authorizeRequests() .anyRequest().authenticated(); } @Bean public MyCustomFilter myCustomFilter() { return new MyCustomFilter(); } }

3. Configure the Filter Order

In the configure(HttpSecurity http) method, you can specify where your filter should be placed in the filter chain:

  • addFilterBefore: Add your filter before a specified filter.
  • addFilterAfter: Add your filter after a specified filter.
  • addFilterAt: Add your filter at a specific position in the filter chain.

Example of Filter Order

http .addFilterBefore(myCustomFilter(), UsernamePasswordAuthenticationFilter.class) // Or add it after another filter // .addFilterAfter(myCustomFilter(), SomeOtherFilter.class) // Or add it at a specific position // .addFilterAt(myCustomFilter(), CustomFilterPosition.class);

4. Testing the Custom Filter

To test your custom filter, start your Spring Boot application and make requests to your endpoints. You should see the custom filter's logic being executed as defined in your doFilterInternal method.

5. Using Filter in Specific Endpoints

If you want to apply the custom filter only to specific endpoints, you can use FilterRegistrationBean for finer control over the filter's behavior.

Example using FilterRegistrationBean

import org.springframework.boot.web.servlet.FilterRegistrationBean; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; @Configuration public class FilterConfig { @Bean public FilterRegistrationBean<MyCustomFilter> loggingFilter(){ FilterRegistrationBean<MyCustomFilter> registrationBean = new FilterRegistrationBean<>(); registrationBean.setFilter(new MyCustomFilter()); registrationBean.addUrlPatterns("/api/*"); // Apply filter to specific URL patterns return registrationBean; } }

Summary

  1. Create the Filter: Implement the Filter interface or extend OncePerRequestFilter.
  2. Register the Filter: Use Spring Security's HttpSecurity configuration to add your filter to the filter chain.
  3. Configure Filter Order: Specify where in the filter chain your custom filter should be placed.
  4. Test the Filter: Verify that your filter is working as expected.

By following these steps, you can successfully create and manage a custom filter in Spring Security, allowing you to apply specific logic or behavior at runtime.

Examples

  1. "Spring Security add custom filter dynamically"

    • Description: Adding a custom filter to the Spring Security filter chain at runtime.
    • Code:
      @Component public class CustomFilter extends OncePerRequestFilter { @Override protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException { // Custom filter logic filterChain.doFilter(request, response); } } @Configuration public class SecurityConfig extends WebSecurityConfigurerAdapter { @Autowired private CustomFilter customFilter; @Override protected void configure(HttpSecurity http) throws Exception { http.addFilterBefore(customFilter, UsernamePasswordAuthenticationFilter.class); } }

  2. "Spring Security filter registration at runtime"

    • Description: Registering a custom filter in Spring Security at application runtime.
    • Code:
      @Bean public FilterRegistrationBean<CustomFilter> customFilterRegistration() { FilterRegistrationBean<CustomFilter> registration = new FilterRegistrationBean<>(new CustomFilter()); registration.addUrlPatterns("/secure/*"); return registration; }

  3. "Spring Security dynamic filter insertion"

    • Description: Inserting a custom security filter dynamically within a Spring application.
    • Code:
      @Configuration public class SecurityConfig extends WebSecurityConfigurerAdapter { @Autowired private ApplicationContext context; @Override protected void configure(HttpSecurity http) throws Exception { CustomFilter customFilter = context.getBean(CustomFilter.class); http.addFilterBefore(customFilter, BasicAuthenticationFilter.class); } }

  4. "Spring Boot add custom filter conditionally"

    • Description: Conditionally adding a custom filter in a Spring Boot application.
    • Code:
      @Configuration public class SecurityConfig extends WebSecurityConfigurerAdapter { @Autowired private Environment env; @Override protected void configure(HttpSecurity http) throws Exception { if (env.getProperty("app.enableCustomFilter", Boolean.class, false)) { http.addFilterBefore(new CustomFilter(), UsernamePasswordAuthenticationFilter.class); } } }

  5. "Spring Security custom filter after login"

    • Description: Executing a custom filter after user login in Spring Security.
    • Code:
      @Component public class PostLoginFilter extends OncePerRequestFilter { @Override protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException { if (request.getUserPrincipal() != null) { // Custom logic for authenticated users } filterChain.doFilter(request, response); } } @Configuration public class SecurityConfig extends WebSecurityConfigurerAdapter { @Autowired private PostLoginFilter postLoginFilter; @Override protected void configure(HttpSecurity http) throws Exception { http.addFilterAfter(postLoginFilter, UsernamePasswordAuthenticationFilter.class); } }

  6. "Spring Security register filter programmatically"

    • Description: Programmatically registering a custom filter in Spring Security configuration.
    • Code:
      @Configuration public class SecurityConfig extends WebSecurityConfigurerAdapter { @Override protected void configure(HttpSecurity http) throws Exception { http.addFilterAt(new CustomFilter(), UsernamePasswordAuthenticationFilter.class); } }

  7. "Spring Security dynamically enable custom filter"

    • Description: Dynamically enabling or disabling a custom filter based on configuration properties.
    • Code:
      @Configuration public class SecurityConfig extends WebSecurityConfigurerAdapter { @Autowired private Environment env; @Override protected void configure(HttpSecurity http) throws Exception { if (env.getProperty("custom.filter.enabled", Boolean.class, false)) { http.addFilterBefore(new CustomFilter(), UsernamePasswordAuthenticationFilter.class); } } }

  8. "Spring Security add filter based on condition"

    • Description: Adding a filter to Spring Security filter chain based on a specific condition.
    • Code:
      @Configuration public class SecurityConfig extends WebSecurityConfigurerAdapter { @Autowired private ConditionService conditionService; @Override protected void configure(HttpSecurity http) throws Exception { if (conditionService.isConditionMet()) { http.addFilterAfter(new CustomFilter(), UsernamePasswordAuthenticationFilter.class); } } }

  9. "Spring Boot custom security filter registration"

    • Description: Registering a custom security filter in a Spring Boot application.
    • Code:
      @Component public class CustomSecurityFilter extends OncePerRequestFilter { @Override protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException { // Custom logic filterChain.doFilter(request, response); } } @Configuration public class SecurityConfig extends WebSecurityConfigurerAdapter { @Autowired private CustomSecurityFilter customSecurityFilter; @Override protected void configure(HttpSecurity http) throws Exception { http.addFilterBefore(customSecurityFilter, UsernamePasswordAuthenticationFilter.class); } }

  10. "Spring Security add filter in specific order"

    • Description: Adding a custom filter in a specific order within the Spring Security filter chain.
    • Code:
      @Configuration public class SecurityConfig extends WebSecurityConfigurerAdapter { @Autowired private CustomFilter customFilter; @Override protected void configure(HttpSecurity http) throws Exception { http.addFilterAfter(customFilter, UsernamePasswordAuthenticationFilter.class); } }

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