/*

  *   SONEWS News Server

  *   see AUTHORS for the list of contributors

  *

  *   This program is free software: you can redistribute it and/or modify

  *   it under the terms of the GNU General Public License as published by

  *   the Free Software Foundation, either version 3 of the License, or

  *   (at your option) any later version.

  *

  *   This program is distributed in the hope that it will be useful,

  *   but WITHOUT ANY WARRANTY; without even the implied warranty of

  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  *   GNU General Public License for more details.

  *

  *   You should have received a copy of the GNU General Public License

  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.

  */

 package org.sonews.mlgw;

 import java.util.Properties;

 import javax.mail.AuthenticationFailedException;

 import javax.mail.Authenticator;

 import javax.mail.Flags.Flag;

 import javax.mail.Folder;

 import javax.mail.Message;

 import javax.mail.MessagingException;

 import javax.mail.NoSuchProviderException;

 import javax.mail.PasswordAuthentication;

 import javax.mail.Session;

 import javax.mail.Store;

 import org.sonews.config.Config;

 import org.sonews.daemon.AbstractDaemon;

 import org.sonews.util.Log;

 import org.sonews.util.Stats;

 /**

  * Daemon polling for new mails in a POP3 account to be delivered to newsgroups.

  * @author Christian Lins

  * @since sonews/0.5.0

  */

 public class MailPoller extends AbstractDaemon

 {

 	static class PasswordAuthenticator extends Authenticator

 	{

 		@Override

 		public PasswordAuthentication getPasswordAuthentication()

 		{

 			final String username =

 				Config.inst().get(Config.MLPOLL_USER, "user");

 			final String password =

 				Config.inst().get(Config.MLPOLL_PASSWORD, "mysecret");

 			return new PasswordAuthentication(username, password);

 		}

 	}

 	@Override

 	public void run()

 	{

 		Log.get().info("Starting Mailinglist Poller...");

 		int errors = 0;

 		while (isRunning()) {

 			try {

 				// Wait some time between runs. At the beginning has advantages,

 				// because the wait is not skipped if an exception occurs.

 				Thread.sleep(60000 * (errors + 1)); // one minute * errors

 				final String host =

 					Config.inst().get(Config.MLPOLL_HOST, "samplehost");

 				final String username =

 					Config.inst().get(Config.MLPOLL_USER, "user");

 				final String password =

 					Config.inst().get(Config.MLPOLL_PASSWORD, "mysecret");

 				Stats.getInstance().mlgwRunStart();

 				// Create empty properties

 				Properties props = System.getProperties();

 				props.put("mail.pop3.host", host);

 				props.put("mail.mime.address.strict", "false");

 				// Get session

 				Session session = Session.getInstance(props);

 				// Get the store

 				Store store = session.getStore("pop3");

 				store.connect(host, 110, username, password);

 				// Get folder

 				Folder folder = store.getFolder("INBOX");

 				folder.open(Folder.READ_WRITE);

 				// Get directory

 				Message[] messages = folder.getMessages();

 				// Dispatch messages and delete it afterwards on the inbox

 				for (Message message : messages) {

 					if (Dispatcher.toGroup(message)

 						|| Config.inst().get(Config.MLPOLL_DELETEUNKNOWN, false)) {

 						// Delete the message

 						message.setFlag(Flag.DELETED, true);

 					}

 				}

 				// Close connection

 				folder.close(true); // true to expunge deleted messages

 				store.close();

 				errors = 0;

 				Stats.getInstance().mlgwRunEnd();

 			} catch (NoSuchProviderException ex) {

 				Log.get().severe(ex.toString());

 				shutdown();

 			} catch (AuthenticationFailedException ex) {

 				// AuthentificationFailedException may be thrown if credentials are

 				// bad or if the Mailbox is in use (locked).

 				ex.printStackTrace();

 				errors = errors < 5 ? errors + 1 : errors;

 			} catch (InterruptedException ex) {

 				System.out.println("sonews: " + this + " returns: " + ex);

 				return;

 			} catch (MessagingException ex) {

 				ex.printStackTrace();

 				errors = errors < 5 ? errors + 1 : errors;

 			} catch (Exception ex) {

 				ex.printStackTrace();

 				errors = errors < 5 ? errors + 1 : errors;

 			}

 		}

 		Log.get().severe("MailPoller exited.");

 	}

 }