AuthenticationServiceImpl.java

package mate.academy.service;

import java.util.Objects;
import mate.academy.exception.AuthenticationException;
import mate.academy.model.User;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class AuthenticationServiceImpl implements AuthenticationService {

    private static final Logger logger = LoggerFactory.getLogger(AuthenticationServiceImpl.class);

    @Override
    public User login(String login, String password) throws AuthenticationException {
        logger.info("Method login was called for user: {}", login);
        User user = findByLogin(login);

        if (user == null || !Objects.equals(user.getPassword(), password)) {

            logger.warn("Failed login attempt for user: {}", login);
            throw new AuthenticationException("Username or password are incorrect");
        }

        logger.info("User {} successfully logged in.", login);
        return user;
    }

    private User findByLogin(String login) {
        if ("bob".equals(login)) {
            User user = new User(login, "1234");
            user.setUserId(2L);
            return user;
        }
        return null;
    }
}