/**
    * This file Copyright (c) 2003-2014 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.cms.security.auth.callback;
  
  import info.magnolia.cms.security.User;
  
  import java.io.IOException;
  
  import javax.security.auth.callback.Callback;
  import javax.security.auth.callback.CallbackHandler;
  import javax.security.auth.callback.NameCallback;
  import javax.security.auth.callback.PasswordCallback;
  import javax.security.auth.callback.TextOutputCallback;
  import javax.security.auth.callback.UnsupportedCallbackException;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  
  /**
   * A JAAS {@link CallbackHandler} using plain text passwords.
   * @version $Id$
   */
  public class CredentialsCallbackHandler implements CallbackHandler {
  
      protected static Logger log = LoggerFactory.getLogger(CredentialsCallbackHandler.class);
  
      protected String name;
  
      protected char[] pswd;
  
      /**
       * The realm to which we login.
       */
      protected String realm;
  
      protected User user;
  
      /**
       * Default constructor required by java security framework.
       */
      public CredentialsCallbackHandler() {
          // do not instanciate with this constructor
      }
  
      public CredentialsCallbackHandler(String name, char[] pswd) {
          this.name = name;
          this.pswd = pswd;
      }
  
      public CredentialsCallbackHandler(String name, char[] pswd, String realm) {
          this(name, pswd);
          this.realm = realm;
      }
  
      /**
       * Handle name and password callbacks called during the JAAS login processing.
       */
      @Override
      public void handle(Callback[] callbacks) throws IOException, UnsupportedCallbackException {
          for (int i = 0; i < callbacks.length; i++) {
              if (callbacks[i] instanceof NameCallback) {
                  ((NameCallback) callbacks[i]).setName(this.name);
              }
              else if (callbacks[i] instanceof PasswordCallback) {
                  ((PasswordCallback) callbacks[i]).setPassword(this.pswd);
              }
              else if (callbacks[i] instanceof RealmCallback) {
                 ((RealmCallback) callbacks[i]).setRealm(this.realm);
             }
             else if (callbacks[i] instanceof UserCallback) {
                 user = ((UserCallback) callbacks[i]).getUser();
             }
             else if (callbacks[i] instanceof TextOutputCallback) {
                 TextOutputCallback outputCallback = (TextOutputCallback) callbacks[i];
                 switch (outputCallback.getMessageType()) {
                     case TextOutputCallback.INFORMATION:
                         log.info(outputCallback.getMessage());
                         break;
                     case TextOutputCallback.ERROR:
                         log.error(outputCallback.getMessage());
                         break;
                     case TextOutputCallback.WARNING:
                         log.warn(outputCallback.getMessage());
                         break;
                     default:
                         if (log.isDebugEnabled()) {
                             log.debug("Unsupported message type : {}", Integer
                                 .toString(outputCallback.getMessageType()));
                             log.debug("Message : {}", outputCallback.getMessage());
                         }
                 }
             }
         }
     }
 
 
     public User getUser() {
         return this.user;
     }
 }