This small library helps you integrating Firebase Auth into your Spring Boot application. It will parse ID Token (JWT) from the Authorization header, verify it then provides a FirebaseUser instance for the current request.

To use it, you need to add following snippet into your build.gradle file:

repositories {
...
	maven {
		url 'https://dl.bintray.com/ageofmobile/spring-firebase-auth'
	}
...	
}

dependencies {
...
	compile('com.ageofmobile:spring-firebase-auth:0.0.4')
...
}

Add @EnableFirebaseSecurity to your Spring Boot Application class:

@SpringBootApplication
@EnableResourceServer
@EnableFirebaseSecurity
public class Application {
	public static void main(String[] args) {
		SpringApplication.run(Application.class, args);
	}
}

Create a configuration class, extend from FirebaseResourceServerConfig class to configure your authentication/authorization rules:

@Configuration
public class ResourceServerConfig extends FirebaseResourceServerConfig {
    @Override
    public void configure(HttpSecurity http) throws Exception {
        http.authorizeRequests().anyRequest().authenticated();
    }
}

In your resourses/application.yaml (or application.properties) you need to add following configuration:

security.oauth2.resource.id: 'your-firebase-app-id'

In your controller classes, you can get the current user by adding a FirebaseUser parameter to request methods:

@RestController
public class ContentControler {
    @RequestMapping(value = "/hello", method = RequestMethod.GET)
    public @ResponseBody String sayHello(FirebaseUser user) {
        return "Hello " + user.getName();
    }
}