Configuring Multiple FilterChains with WebSecurityConfigurerAdapter

In this article, we will be discussing how to configure multiple FilterChains using the WebSecurityConfigurerAdapter class in a Spring Boot application. This is a powerful feature that allows you to have multiple filter chains, each with its own specific set of filters and security rules. This can be useful in a variety of scenarios, such as when you have different security requirements for different parts of your application.

Prerequisites

Before we begin, it is assumed that you have a basic understanding of Spring Boot and the Spring Security framework. Additionally, you should have a basic understanding of Java and Maven. If you are not familiar with these technologies, it is recommended that you familiarize yourself with them before proceeding.

Creating a New Spring Boot Project

To get started, you will need to create a new Spring Boot project. You can do this by going to the Spring Initializr website and selecting the following options:

• Project: Maven Project
• Language: Java
• Packaging: Jar
• Java: 11
• Dependencies: Web, Security

Once you have selected these options, click the “Generate” button to download the project. Extract the downloaded file and open the project in your favorite IDE.

Configuring Multiple FilterChains

Now that we have a new Spring Boot project, we can start configuring multiple FilterChains. To do this, we will need to create a new class that extends the WebSecurityConfigurerAdapter class. This class will be responsible for configuring the FilterChains.

@Configuration
@EnableWebSecurity
public class MultiFilterChainConfig extends WebSecurityConfigurerAdapter {

 // Configuration code will be added here

}

In this class, we will need to override the configure(HttpSecurity http) method. This method is called by Spring Security to configure the HTTP security for the application. Inside this method, we will need to define the FilterChains.

To define a FilterChain, we will need to use the antMatcher() method to specify the URL pattern for the FilterChain. This method takes a string argument that specifies the URL pattern using an Ant-style pattern. For example, the following code defines a FilterChain for URLs that start with /admin.

http.antMatcher("/admin/**")
    .authorizeRequests()
    .anyRequest().authenticated();

Inside the antMatcher() method, we can configure the security rules for the FilterChain using the authorizeRequests() method. This method returns a RequestMatcherConfigurer object that can be used to configure the security rules. In the above example, we are using the anyRequest().authenticated() method to require that all requests to URLs that start with /admin are authenticated.

We can define multiple FilterChains by chaining multiple antMatcher() methods together. For example, the following code defines two FilterChains, one for URLs that start with /admin and another for URLs that start with /user.

http
    .antMatcher("/admin/**")
    .authorizeRequests()
    .anyRequest().authenticated()
    .and()
    .antMatcher("/user/**")
    .authorizeRequests()
    .anyRequest().permitAll();

In this example, the first FilterChain requires that all requests to URLs that start with /admin are authenticated. The second FilterChain permits all requests to URLs that start with /user, so authentication is not required.

Testing the FilterChains

Now that we have defined our FilterChains, we can test them by running the Spring Boot application and accessing the URLs that we defined in the FilterChains. For example, if we defined a FilterChain for URLs that start with /admin, we can test it by accessing the following URL in a web browser:

http://localhost:8080/admin

If the FilterChain is working correctly, we should be prompted to authenticate before we can access the URL. If the FilterChain is not working correctly, we will be able to access the URL without authenticating.

In this article, we have discussed how to configure multiple FilterChains using the WebSecurityConfigurerAdapter class in a Spring Boot application. This is a powerful feature that allows you to have multiple filter chains, each with its own specific set of filters and security rules. By using this feature, you can create a more secure and flexible application that meets the needs of your users.

References