/**
    * Copyright 2009, Frederic Bregier, and individual contributors by the @author tags. See the
    * COPYRIGHT.txt in the distribution for a full listing of individual contributors.
    * 
    * This is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser
    * General Public License as published by the Free Software Foundation; either version 3.0 of the
    * License, or (at your option) any later version.
    * 
    * This software is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
   * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
   * GNU Lesser General Public License for more details.
   * 
   * You should have received a copy of the GNU Lesser General Public License along with this
   * software; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
   * Boston, MA 02110-1301 USA, or see the FSF site: http://www.fsf.org.
   */
  package org.waarp.gateway.ftp.config;
  
  import java.io.File;
  
  import org.waarp.common.command.ReplyCode;
  import org.waarp.common.command.exception.CommandAbstractException;
  import org.waarp.common.command.exception.Reply500Exception;
  import org.waarp.common.command.exception.Reply501Exception;
  import org.waarp.common.logging.WaarpLogger;
  import org.waarp.common.logging.WaarpLoggerFactory;
  import org.waarp.ftp.core.command.AbstractCommand;
  
  /**
   * AUTHTUPDATE command: implements the command that will try to update the authentications from the
   * file given as argument or the original one if no argument is given.<br>
   * Two optional arguments exist:<br>
   * - PURGE: empty first the current authentications before applying the update<br>
   * - SAVE: save the final authentications on the original name given at startup.<br>
   * 
   * @author Frederic Bregier
   * 
   */
  public class AUTHUPDATE extends AbstractCommand {
      /**
       * Internal Logger
       */
      private static final WaarpLogger logger = WaarpLoggerFactory
              .getLogger(AUTHUPDATE.class);
  
      @Override
      public void exec() throws CommandAbstractException {
          if (!getSession().getAuth().isAdmin()) {
              // not admin
              throw new Reply500Exception("Command Not Allowed");
          }
          String filename = null;
          boolean purge = false;
          boolean write = false;
          if (!hasArg()) {
              filename = ((FileBasedConfiguration) getConfiguration()).getAuthenticationFile();
          } else {
              String[] authents = getArgs();
              for (int i = 0; i < authents.length; i++) {
                  if (authents[i].equalsIgnoreCase("PURGE")) {
                      purge = true;
                  } else if (authents[i].equalsIgnoreCase("SAVE")) {
                      write = true;
                  } else if (filename == null) {
                      filename = authents[i];
                  }
              }
              if (filename == null) {
                  filename = ((FileBasedConfiguration) getConfiguration()).getAuthenticationFile();
              }
              File file = new File(filename);
              if (!file.canRead()) {
                  throw new Reply501Exception("Filename given as parameter is not found: " + filename);
              }
          }
          if (!((FileBasedConfiguration) getConfiguration()).initializeAuthent(filename, purge)) {
              throw new Reply501Exception("Filename given as parameter is not correct");
          }
          if (write) {
              if (!((FileBasedConfiguration) getConfiguration()).
                      saveAuthenticationFile(
                      ((FileBasedConfiguration) getConfiguration()).getAuthenticationFile())) {
                  throw new Reply501Exception("Update is done but Write operation is not correct");
              }
          }
          logger.warn("Authentication was updated from " + filename);
          getSession().setReplyCode(ReplyCode.REPLY_200_COMMAND_OKAY,
                  "Authentication is updated");
      }
  
  }