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1   /************************************************************************
2    * Copyright (c) 2000-2006 The Apache Software Foundation.             *
3    * All rights reserved.                                                *
4    * ------------------------------------------------------------------- *
5    * Licensed under the Apache License, Version 2.0 (the "License"); you *
6    * may not use this file except in compliance with the License. You    *
7    * may obtain a copy of the License at:                                *
8    *                                                                     *
9    *     http://www.apache.org/licenses/LICENSE-2.0                      *
10   *                                                                     *
11   * Unless required by applicable law or agreed to in writing, software *
12   * distributed under the License is distributed on an "AS IS" BASIS,   *
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or     *
14   * implied.  See the License for the specific language governing       *
15   * permissions and limitations under the License.                      *
16   ***********************************************************************/
17  
18  package org.apache.james.transport.mailets;
19  
20  import org.apache.mailet.GenericMailet;
21  import org.apache.mailet.Mail;
22  import org.apache.mailet.MailAddress;
23  
24  import javax.mail.MessagingException;
25  
26  /***
27   * An abstract implementation of a listserv manager.  This mailet reads the
28   * address to find the command.
29   */
30  public abstract class GenericListservManager extends GenericMailet {
31  
32      /***
33       * Adds an address to the listserv.  Returns whether command was
34       * successful.
35       */
36      public abstract boolean addAddress(MailAddress address);
37  
38      /***
39       * Removes an address from the listserv.  Returns whether command
40       * was successful.
41       */
42      public abstract boolean removeAddress(MailAddress address);
43  
44  
45      /***
46       * Indicates whether an address already exists on the listserv. Returns
47       * whether the address exists.
48       */
49      public abstract boolean existsAddress(MailAddress address);
50  
51      /***
52       * Processes the message.  Checks which command was sent based on the
53       * recipient address, and does the appropriate action.
54       */
55      public final void service(Mail mail) throws MessagingException {
56          if (mail.getRecipients().size() != 1) {
57              getMailetContext().bounce(mail, "You can only send one command at a time to this listserv manager.");
58              return;
59          }
60          MailAddress address = (MailAddress)mail.getRecipients().iterator().next();
61          if (address.getUser().endsWith("-off")) {
62              if (existsAddress(mail.getSender())) {
63                  if (removeAddress(mail.getSender())) {
64                      getMailetContext().bounce(mail, "Successfully removed from listserv.");
65                  } else {
66                      getMailetContext().bounce(mail, "Unable to remove you from listserv for some reason.");
67                  }
68              } else {
69                  getMailetContext().bounce(mail, "You are not subscribed to this listserv.");
70              }
71          } else if (address.getUser().endsWith("-on")) {
72              if (existsAddress(mail.getSender())) {
73                  getMailetContext().bounce(mail, "You are already subscribed to this listserv.");
74              } else {
75                  if (addAddress(mail.getSender())) {
76                      getMailetContext().bounce(mail, "Successfully added to listserv.");
77                  } else {
78                      getMailetContext().bounce(mail, "Unable to add you to the listserv for some reason");
79                  }
80              }
81          } else {
82              getMailetContext().bounce(mail, "Could not understand the command you sent to this listserv manager.\r\n"
83                                        + "Valid commands are <listserv>-on@domain.com and <listserv>-off@domain.com");
84          }
85          //Kill the command message
86          mail.setState(Mail.GHOST);
87      }
88  }