Authentication with Spring Security + Spring data + MongoDB

Question

I want to use Spring security with MongoDB (using Spring data) and retrieve the users from my own database for spring security. However, I can not do that since my userservice type does not seem to be supported.

This is my UserService class:

public class UserService {
    private ApplicationContext applicationContext;
    private MongoOperations mongoOperations;

    public UserService() {
        applicationContext = new AnnotationConfigApplicationContext(MongoConfig.class);
        mongoOperations = (MongoOperations) applicationContext.getBean("mongoTemplate");
    }

    public User find(String username) {
        return mongoOperations.findOne(Query.query(Criteria.where("username").is(username)), User.class);
    }
}

And my SecurityConfig class:

@Configuration
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {
    @Autowired
    UserService userService;

    @Autowired
    public void configAuthBuilder(AuthenticationManagerBuilder builder) throws Exception {
        builder.userDetailsService(userService); //THIS DOES NOT WORK
        builder.inMemoryAuthentication().withUser("username").password("password").roles("USER");
    }

}

The line I commented says:

The inferred type UserService is not a valid substitute for the bounded parameter <T extends UserDetailsService>.

How can I fix it so I can retrieve the users from my own database?

Answer 1

Service Layer

You have to create a separate service implementing org.springframework.security.core.userdetails.UserDetailsService and inject it inside the AuthenticationManagerBuilder.

@Component
public class SecUserDetailsService implements UserDetailsService{

    @Autowired
    private UserRepository userRepository;

    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        /*Here add user data layer fetching from the MongoDB.
          I have used userRepository*/
        User user = userRepository.findByUsername(username);
        if(user == null){
            throw new UsernameNotFoundException(username);
        }else{
            UserDetails details = new SecUserDetails(user);
            return details;
        }
    }
}

Model

UserDetails Should be also implemented. This is the POJO which will keep the user authenticated details by the Spring. You may include your Entity data object wrapped inside it, as I have done.

public class SecUserDetails implements UserDetails {

    private User user;

    public SecUserDetails(User user) {
        this.user = user;
    }
    ......
    ......
    ......
}

Security Config

Autowire the service that we created before and set it inside the AuthenticationManagerBuilder

@Configuration
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {
    @Autowired
    SecUserDetailsService userDetailsService ;

    @Autowired
    public void configAuthBuilder(AuthenticationManagerBuilder builder) throws Exception {
        builder.userDetailsService(userDetailsService); 
    }
}