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 * regarding copyright ownership.  The ASF licenses this file   *
 * to you under the Apache License, Version 2.0 (the            *
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package org.apache.james.transport.mailets.listservcommands;

import org.apache.avalon.framework.configuration.Configuration;
import org.apache.avalon.framework.configuration.ConfigurationException;
import org.apache.james.services.UsersRepository;
import org.apache.james.transport.mailets.ICommandListservManager;
import org.apache.james.util.XMLResources;
import org.apache.mailet.Mail;
import org.apache.mailet.MailAddress;

import javax.mail.MessagingException;
import java.util.Properties;

/**
 * UnSubscribe handles the unsubscribe command.
 * It is configured by:
 * <pre><command name="unsubscribe" class="UnSubscribe"/></pre>
 *
 * <br />
 * <br />
 *
 * It uses the formatted text-based resources for its return mail body:
 * <ul>
 *  <li>unsubscribe
 * </ul>
 *
 * <br />
 * <br />
 * After formatting the text, the message is delivered with {@link #sendStandardReply}
 *
 * Note, prior to formatting and sending any text, the user is checked to see that they
 * are currently subscribed to this list.  If so, they will be sent a confirmation mail to
 * be processed by {@link UnSubscribeConfirm}
 *
 * @version CVS $Revision: 494012 $ $Date: 2007-01-08 11:23:58 +0100 (Mo, 08 Jan 2007) $
 * @since 2.2.0
 * @see UnSubscribeConfirm
 */
public class UnSubscribe extends BaseCommand {

    //For resources
    protected XMLResources xmlResources;

    public void init(ICommandListservManager commandListservManager, Configuration configuration) throws ConfigurationException {
        super.init(commandListservManager, configuration);
        xmlResources = initXMLResources(new String[]{"unsubscribe"})[0];
    }

    /**
     * After ensuring that the user is currently subscribed, confirmation mail
     * will be sent to be processed by {@link UnSubscribeConfirm}.
     * @param mail
     * @throws MessagingException
     */
    public void onCommand(Mail mail) throws MessagingException {
        if (checkSubscriptionStatus(mail)) {
            //send confirmation mail
            Properties props = getStandardProperties();
            props.put("SENDER_ADDR", mail.getSender().toString());

            String confirmationMail = xmlResources.getString("text", props);
            String subject = xmlResources.getString("confirm.unsubscribe.subject", props);
            String replyAddress = xmlResources.getString("confirm.unsubscribe.address", props);

            sendStandardReply(mail, subject, confirmationMail, replyAddress);
        }
    }

    /**
     * Checks to see that this user is already subscribed, if not return false and send a message
     * @param mail
     * @return false if the user isn't subscribed, true otherwise
     * @throws MessagingException
     */
    protected boolean checkSubscriptionStatus(Mail mail) throws MessagingException {
        MailAddress mailAddress = mail.getSender();
        UsersRepository usersRepository = getUsersRepository();
        if (!usersRepository.contains(mailAddress.toString())) {
            getCommandListservManager().onError(mail,
                    "Invalid request",
                    xmlResources.getString("not.subscribed", getStandardProperties()));
            return false;
        }
        return true;
    }
}