When it comes to authentication in Spring Boot, there are a few different ways to go about it. In this post, we'll take a look at how to implement a custom authentication provider.
An authentication provider is a piece of software that handles the process of authenticating a user. In the context of a web application, this typically means verifying that the user has provided the correct credentials (username and password) and, if so, allowing them access to the application.
There are a few reasons you might want to use a custom authentication provider:
Implementing a custom authentication provider is actually quite simple. All you need to do is create a class that implements the org.springframework.security.authentication.AuthenticationProvider interface.
Here's a simple example:
public class MyAuthenticationProvider implements AuthenticationProvider {
@Override
public Authentication authenticate(Authentication authentication) throws AuthenticationException {
// TODO: Implement authentication logic here
return null;
}
@Override
public boolean supports(Class<?> authentication) {
// TODO: Implement authentication support logic here
return false;
}
}
There are two methods that need to be implemented:
authenticate()
: This is where the actual authentication logic goes. The method takes an Authentication
object as a parameter and returns an Authentication
object.supports()
: This method is used to determine if the AuthenticationProvider
supports the given Authentication
object.Once the AuthenticationProvider
has been implemented, the next step is to configure it in Spring Boot. This can be done by adding the following to the application.properties
file:
spring.security.authentication-provider.class=com.example.MyAuthenticationProvider
To test the authentication provider, you can use the @WithMockUser
annotation on a test method. This will create a mock user with the given username and password that can be used to authenticate against the authentication provider.
Here's a simple example:
@Test
@WithMockUser(username="test", password="test")
public void testAuthentication() {
// TODO: Implement authentication test here
}
In this post, we've looked at how to implement a custom authentication provider in Spring Boot. We've also seen how to configure it and how to test it.