/**
    * This file Copyright (c) 2003-2011 Magnolia International
    * Ltd.  (http://www.magnolia-cms.com). All rights reserved.
    *
    *
    * This file is dual-licensed under both the Magnolia
    * Network Agreement and the GNU General Public License.
    * You may elect to use one or the other of these licenses.
    *
   * This file is distributed in the hope that it will be
   * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
   * implied warranty of MERCHANTABILITY or FITNESS FOR A
   * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
   * Redistribution, except as permitted by whichever of the GPL
   * or MNA you select, is prohibited.
   *
   * 1. For the GPL license (GPL), you can redistribute and/or
   * modify this file under the terms of the GNU General
   * Public License, Version 3, as published by the Free Software
   * Foundation.  You should have received a copy of the GNU
   * General Public License, Version 3 along with this program;
   * if not, write to the Free Software Foundation, Inc., 51
   * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * 2. For the Magnolia Network Agreement (MNA), this file
   * and the accompanying materials are made available under the
   * terms of the MNA which accompanies this distribution, and
   * is available at http://www.magnolia-cms.com/mna.html
   *
   * Any modifications to this file must keep this entire header
   * intact.
   *
   */
  package info.magnolia.jaas.sp.jcr;
  
  import info.magnolia.cms.security.SecuritySupport;
  import info.magnolia.cms.security.User;
  import info.magnolia.cms.security.UserManager;
  import info.magnolia.jaas.sp.AbstractLoginModule;
  import info.magnolia.jaas.sp.UserAwareLoginModule;
  
  import java.io.Serializable;
  
  import javax.security.auth.login.AccountLockedException;
  import javax.security.auth.login.AccountNotFoundException;
  import javax.security.auth.login.FailedLoginException;
  import javax.security.auth.login.LoginException;
  
  import org.apache.commons.lang.StringUtils;
  
  /**
   * Authentication module implementation using JCR to retrieve the users.
   * @author Sameer Charles $Id: JCRAuthenticationModule.java 50211 2011-10-20 10:33:41Z tmattsson $
   */
  public class JCRAuthenticationModule extends AbstractLoginModule implements UserAwareLoginModule, Serializable {
  
      protected User user;
  
  
      /**
       * Checks is the credentials exist in the repository.
       * @throws LoginException or specific subclasses (which will be handled further for user feedback)
       */
      @Override
      public void validateUser() throws LoginException {
          initUser();
  
          if (this.user == null) {
              throw new AccountNotFoundException("User account " + this.name + " not found.");
          }
  
          matchPassword();
  
          if (!this.user.isEnabled()) {
              throw new AccountLockedException("User account " + this.name + " is locked.");
          }
  
          if (!UserManager.ANONYMOUS_USER.equals(user.getName())) {
              // update last access date for all non anonymous users
              getUserManager().updateLastAccessTimestamp(user);
          }
      }
  
      private UserManager getUserManager() {
          // can't get the factory upfront and can't use IoC as this class is instantiated by JCR/JAAS before anything else is ready.
          log.debug("getting user manager for realm " + realm.getName());
          return SecuritySupport.Factory.getInstance().getUserManager(realm.getName());
      }
  
  
  
      protected void initUser() throws LoginException {
          log.debug("initializing user {}", name);
  
          long start = System.currentTimeMillis();
          this.user = getUserManager().getUser(name);
          log.debug("initialized user {} in {}ms", name, (System.currentTimeMillis() - start));
      }
  
     protected void matchPassword() throws LoginException {
         String serverPassword = user.getPassword();
 
         if (StringUtils.isEmpty(serverPassword)) {
             throw new FailedLoginException("we do not allow users with no password");
         }
 
         if (!StringUtils.equals(serverPassword, new String(this.pswd))) {
             throw new FailedLoginException("passwords do not match");
         }
     }
 
     /**
      * Set user details.
      */
     @Override
     public void setEntity() {
 
         this.subject.getPrincipals().add(this.user);
         this.subject.getPrincipals().add(this.realm);
 
         collectGroupNames();
         collectRoleNames();
     }
 
     /**
      * Set access control list from the user, roles and groups.
      */
     @Override
     public void setACL() {
     }
 
     /**
      * Extract all the configured roles from the given node. (which can be the user node or a group node)
      */
     public void collectRoleNames() {
         for (String role : this.user.getAllRoles()) {
             addRoleName(role);
         }
     }
 
     /**
      * Extract all the configured groups from the given node. (which can be the user node or a group node)
      */
     public void collectGroupNames() {
         for (String group : this.user.getAllGroups()) {
             addGroupName(group);
         }
     }
 
     @Override
     public User getUser() {
         return user;
     }
 }