DomainUserDetailsService.java

/* vim: set ts=2 et sw=2 cindent fo=qroca: */

package com.globant.katari.user.integration;

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

import org.apache.commons.lang.Validate;

import org.acegisecurity.userdetails.UserDetailsService;
import org.acegisecurity.userdetails.UserDetails;
import org.acegisecurity.userdetails.UsernameNotFoundException;

import com.globant.katari.user.domain.User;
import com.globant.katari.user.domain.UserRepository;

/** A user details service needed by acegi, that that obtains the user
 * information from the application domain.
 */
public class DomainUserDetailsService implements UserDetailsService {

  /** The class logger.
   */
  private static Logger log =
    LoggerFactory.getLogger(DomainUserDetailsService.class);

  /** The user service used to get the domain user.
   *
   * It is never null.
   */
  private UserRepository userRepository;

  /** Builds an instance of this service.
   *
   * @param theUserRepository The user repository to get the domain user from.
   * It cannot be null.
   */
  public DomainUserDetailsService(final UserRepository theUserRepository) {
    Validate.notNull(theUserRepository, "The user repository cannot be null");
    userRepository = theUserRepository;
  }

  /** Obtains the user details from a user name.
   *
   * @param username The user name to search. This cannot be null.
   *
   * @return Returns the user details needed by acegi. Specifically, an
   * instance of DomainUserDetails.
   */
  public UserDetails loadUserByUsername(final String username) {

    log.trace("Entering loadUserByUsername");

    Validate.notNull(username, "The username cannot be null");

    User user = userRepository.findUserByName(username);

    if (user == null) {
      throw new UsernameNotFoundException("User not found: " + username);
    }

    UserDetails userDetails = new DomainUserDetails(user);

    log.trace("Leaving loadUserByUsername");
    return userDetails;
  }
}