Login.java

package com.kritsit.casetracker.server.domain.services;

import com.kritsit.casetracker.server.datalayer.IUserRepository;
import com.kritsit.casetracker.server.datalayer.RowToModelParseException;
import com.kritsit.casetracker.server.domain.model.AuthenticationException;
import com.kritsit.casetracker.shared.domain.model.Staff;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class Login implements ILoginService {
    private final Logger logger = LoggerFactory.getLogger(Login.class);
    private IUserRepository repository;

    public Login(IUserRepository repository) {
        this.repository = repository;
    }

    public Staff login(String username, int passwordHash) throws RowToModelParseException, AuthenticationException {
        logger.info("Logging in {}", username);
        long passwordSaltedHash = repository.getPasswordSaltedHash(username);
        long salt = repository.getSalt(username);
        long testPasswordSaltedHash = salt + passwordHash;
        boolean isAuthenticated = !(passwordSaltedHash == -1 || testPasswordSaltedHash != passwordSaltedHash);
        
        if(!isAuthenticated) {
            logger.debug("Log in failed");
        	throw new AuthenticationException();
        }
        
        return repository.getUserDetails(username);
    }
}