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1   /*****************************************************************
2    * Licensed to the Apache Software Foundation (ASF) under one   *
3    * or more contributor license agreements.  See the NOTICE file *
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5    * regarding copyright ownership.  The ASF licenses this file   *
6    * to you under the Apache License, Version 2.0 (the            *
7    * "License"); you may not use this file except in compliance   *
8    * with the License.  You may obtain a copy of the License at   *
9    *                                                              *
10   *   http://www.apache.org/licenses/LICENSE-2.0                 *
11   *                                                              *
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14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
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17   * under the License.                                           *
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19  
20  package org.apache.james.transport.mailets;
21  
22  import org.apache.mailet.GenericMailet;
23  import org.apache.mailet.Mail;
24  import org.apache.mailet.MailAddress;
25  import org.apache.mailet.MailetContext;
26  
27  import javax.mail.MessagingException;
28  import java.util.Collection;
29  import java.util.Iterator;
30  import java.util.Vector;
31  
32  /***
33   * Rewrites recipient addresses to make sure email for the postmaster is
34   * always handled.  This mailet is silently inserted at the top of the root
35   * spool processor.  All recipients mapped to postmaster@<servernames> are
36   * changed to the postmaster account as specified in the server conf.
37   *
38   */
39  public class PostmasterAlias extends GenericMailet {
40  
41      /***
42       * Make sure that a message that is addressed to a postmaster alias is always
43       * sent to the postmaster address, regardless of delivery to other recipients.
44       *
45       * @param mail the mail to process
46       *
47       * @throws MessagingException if an error is encountered while modifying the message
48       */
49      public void service(Mail mail) throws MessagingException {
50          Collection recipients = mail.getRecipients();
51          Collection recipientsToRemove = null;
52          MailetContext mailetContext = getMailetContext();
53          boolean postmasterAddressed = false;
54  
55          for (Iterator i = recipients.iterator(); i.hasNext(); ) {
56              MailAddress addr = (MailAddress)i.next();
57              if (addr.getUser().equalsIgnoreCase("postmaster") &&
58                  mailetContext.isLocalServer(addr.getHost())) {
59                  //Should remove this address... we want to replace it with
60                  //  the server's postmaster address
61                  if (recipientsToRemove == null) {
62                      recipientsToRemove = new Vector();
63                  }
64                  recipientsToRemove.add(addr);
65                  //Flag this as having found the postmaster
66                  postmasterAddressed = true;
67              }
68          }
69          if (postmasterAddressed) {
70              recipients.removeAll(recipientsToRemove);
71              recipients.add(getMailetContext().getPostmaster());
72          }
73      }
74  
75      /***
76       * Return a string describing this mailet.
77       *
78       * @return a string describing this mailet
79       */
80      public String getMailetInfo() {
81          return "Postmaster aliasing mailet";
82      }
83  }