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 * 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                 *
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 * 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.james.transport.mailets;

import org.apache.mailet.GenericMailet;
import org.apache.mailet.Mail;
import org.apache.mailet.MailAddress;

import javax.mail.internet.MimeMessage;

/**
 * Returns the current time for the mail server.  Sample configuration:
 * <mailet match="RecipientIs=time@cadenza.lokitech.com" class="ServerTime">
 * </mailet>
 *
 */
public class ServerTime extends GenericMailet {
    /**
     * Sends a message back to the sender indicating what time the server thinks it is.
     *
     * @param mail the mail being processed
     *
     * @throws MessagingException if an error is encountered while formulating the reply message
     */
    public void service(Mail mail) throws javax.mail.MessagingException {
        MimeMessage response = (MimeMessage)mail.getMessage().reply(false);
        response.setSubject("The time is now...");
        StringBuffer textBuffer =
            new StringBuffer(128)
                    .append("This mail server thinks it's ")
                    .append((new java.util.Date()).toString())
                    .append(".");
        response.setText(textBuffer.toString());

        // Someone manually checking the server time by hand may send
        // an formatted message, lacking From and To headers.  If the
        // response fields are null, try setting them from the SMTP
        // MAIL FROM/RCPT TO commands used to send the inquiry.

        if (response.getFrom() == null) {
            response.setFrom(((MailAddress)mail.getRecipients().iterator().next()).toInternetAddress());
        }

        if (response.getAllRecipients() == null) {
            response.setRecipients(MimeMessage.RecipientType.TO, mail.getSender().toString());
        }

        response.saveChanges();
        getMailetContext().sendMail(response);
    }

    /**
     * Return a string describing this mailet.
     *
     * @return a string describing this mailet
     */
    public String getMailetInfo() {
        return "ServerTime Mailet";
    }
}