/*
* Copyright (C) The Apache Software Foundation. All rights reserved.
*
* This software is published under the terms of the Apache Software License
* version 1.1, a copy of which has been included with this distribution in
* the LICENSE file.
*/
package org.apache.james.transport.mailets;
import org.apache.mailet.GenericMailet;
import org.apache.mailet.Mail;
import org.apache.mailet.MailAddress;
import javax.mail.MessagingException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.util.Collection;
import java.util.StringTokenizer;
import java.util.Vector;
/**
* <p>Mailet designed to process the recipients from the mail headers rather
* than the recipients specified in the SMTP message header. This can be
* useful if your mail is redirected on-route by a mail server that
* substitutes a fixed recipient address for the original.</p>
*
* <p>To use this, match against the redirection address using the
* <code>RecipientIs</code> matcher and set the mailet 'class' to
* <code>UseHeaderRecipients</code>. This will cause the email to be
* re-injected into the root process with the recipient substituted
* by all the recipients in the Mail-For, To and Cc headers
* of the message.</p>
*
* <p>e.g.</p>
* <pre>
* <mailet match="RecipientIs=forwarded@myhost"
* class="UseHeaderRecipients">
* </mailet>
* </pre>
*
* @version 1.0.0, 24/11/2000
* @author Stuart Roebuck <stuart.roebuck@adolos.com>
*/
public class UseHeaderRecipients extends GenericMailet {
/**
* Process an incoming email, removing the currently identified
* recipients and replacing them with the recipients indicated in
* the Mail-For, To and Cc headers of the actual email.
*
* @param mail incoming email
*/
public void service(Mail mail) throws MessagingException {
MimeMessage message = mail.getMessage();
// Utilise features of Set Collections such that they automatically
// ensure that no two entries are equal using the equality method
// of the element objects. MailAddress objects test equality based
// on equivalent but not necessarily visually identical addresses.
Collection recipients = mail.getRecipients();
// Wipe all the exist recipients
recipients.clear();
recipients.addAll(getHeaderMailAddresses(message, "Mail-For"));
if (recipients.isEmpty()) {
recipients.addAll(getHeaderMailAddresses(message, "To"));
recipients.addAll(getHeaderMailAddresses(message, "Cc"));
}
log("All recipients = " + recipients.toString());
log("Reprocessing mail using recipients in message headers");
// Return email to the "root" process.
getMailetContext().sendMail(mail.getSender(), mail.getRecipients(), mail.getMessage());
mail.setState(Mail.GHOST);
}
public String getMailetInfo() {
return "UseHeaderRecipients Mailet";
}
/**
* Work through all the headers of the email with a matching name and
* extract all the mail addresses as a collection of addresses.
*
* @param mail the mail message to read
* @param name the header name as a String
* @return the collection of MailAddress objects.
*/
private Collection getHeaderMailAddresses(MimeMessage message, String name) throws MessagingException {
log("Checking " + name + " headers");
Collection addresses = new Vector();
String[] headers = message.getHeader(name);
String addressString;
InternetAddress iAddress;
if (headers != null) {
for(int i = 0; i < headers.length; i++) {
StringTokenizer st = new StringTokenizer(headers[i], ",", false);
while (st.hasMoreTokens()) {
addressString = st.nextToken();
iAddress = new InternetAddress(addressString);
log("Address = " + iAddress.toString());
addresses.add(new MailAddress(iAddress));
}
}
}
return addresses;
}
}