/****************************************************************
    * Licensed to the Apache Software Foundation (ASF) under one   *
    * or more contributor license agreements.  See the NOTICE file *
    * distributed with this work for additional information        *
    * regarding copyright ownership.  The ASF licenses this file   *
    * to you under the Apache License, Version 2.0 (the            *
    * "License"); you may not use this file except in compliance   *
    * with the License.  You may obtain a copy of the License at   *
    *                                                              *
   *   http://www.apache.org/licenses/LICENSE-2.0                 *
   *                                                              *
   * Unless required by applicable law or agreed to in writing,   *
   * software distributed under the License is distributed on an  *
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
   * KIND, either express or implied.  See the License for the    *
   * specific language governing permissions and limitations      *
   * under the License.                                           *
   ****************************************************************/
  package org.apache.jsieve.mailet;
  
  import java.net.InetAddress;
  import java.net.UnknownHostException;
  import java.util.ArrayList;
  import java.util.Collection;
  
  import javax.mail.Address;
  import javax.mail.MessagingException;
  import javax.mail.internet.InternetAddress;
  import javax.mail.internet.MimeMessage;
  import javax.mail.internet.MimeMultipart;
  
  import org.apache.jsieve.mail.Action;
  import org.apache.jsieve.mail.ActionReject;
  import org.apache.mailet.Mail;
  import org.apache.mailet.MailAddress;
  import org.apache.jsieve.mailet.mdn.ActionModeAutomatic;
  import org.apache.jsieve.mailet.mdn.Disposition;
  import org.apache.jsieve.mailet.mdn.DispositionModifier;
  import org.apache.jsieve.mailet.mdn.MDNFactory;
  import org.apache.jsieve.mailet.mdn.ModifierError;
  import org.apache.jsieve.mailet.mdn.SendingModeAutomatic;
  import org.apache.jsieve.mailet.mdn.TypeDeleted;
  
  public class RejectAction implements MailAction {
  
      public void execute(Action action, Mail mail, ActionContext context)
              throws MessagingException {
          if (action instanceof ActionReject) {
              final ActionReject actionReject = (ActionReject) action;
              execute(actionReject, mail, context);
          }
  
      }
  
      /**
       * <p>
       * Method execute executes the passed ActionReject. It sends an RFC 2098
       * compliant reject MDN back to the sender.
       * </p>
       * <p>
       * NOTE: The Mimecontent type should be 'report', but as we do not yet have
       * a DataHandler for this yet, its currently 'text'!
       * 
       * @param anAction not null
       * @param aMail not null
       * @param context not null
       * @throws MessagingException
       */
      public void execute(ActionReject anAction, Mail aMail, ActionContext context) throws MessagingException
      {
          ActionUtils.detectAndHandleLocalLooping(aMail, context, "reject");
  
          // Create the MDN part
          StringBuffer humanText = new StringBuffer(128);
          humanText
                  .append("This message was refused by the recipient's mail filtering program.");
          humanText.append("\r\n");
          humanText.append("The reason given was:");
          humanText.append("\r\n");
          humanText.append("\r\n");
          humanText.append(anAction.getMessage());
  
          String reporting_UA_name = null;
          try
          {
              reporting_UA_name = InetAddress.getLocalHost()
                      .getCanonicalHostName();
          }
          catch (UnknownHostException ex)
          {
              reporting_UA_name = "localhost";
          }
  
          String reporting_UA_product = context.getServerInfo();
  
          String[] originalRecipients = aMail.getMessage().getHeader(
                  "Original-Recipient");
          String original_recipient = null;
          if (null != originalRecipients && originalRecipients.length > 0)
         {
             original_recipient = originalRecipients[0];
         }
 
         MailAddress soleRecipient = ActionUtils.getSoleRecipient(aMail);
         String final_recipient = soleRecipient.toString();
 
         String original_message_id = aMail.getMessage().getMessageID();
 
         DispositionModifier modifiers[] = {new ModifierError()};
         Disposition disposition = new Disposition(new ActionModeAutomatic(),
                 new SendingModeAutomatic(), new TypeDeleted(), modifiers);
 
         MimeMultipart multiPart = MDNFactory.create(humanText.toString(),
                 reporting_UA_name, reporting_UA_product, original_recipient,
                 final_recipient, original_message_id, disposition);
 
         // Send the message
         MimeMessage reply = (MimeMessage) aMail.getMessage().reply(false);
         reply.setFrom(soleRecipient.toInternetAddress());
         reply.setContent(multiPart);
         reply.saveChanges();
         Address[] recipientAddresses = reply.getAllRecipients();
         if (null != recipientAddresses)
         {
             Collection recipients = new ArrayList(recipientAddresses.length);
             for (int i = 0; i < recipientAddresses.length; i++)
             {
                 recipients.add(new MailAddress(
                         (InternetAddress) recipientAddresses[i]));
             }
             context.post(null, recipients, reply);
         }
         else
         {
             context.getLog().info("Unable to send reject MDN. Could not determine the recipient.");
         }
         // Ghost the original mail
         aMail.setState(Mail.GHOST);
     }
 
 }