chris@1: /*
chris@1:  *   SONEWS News Server
chris@1:  *   see AUTHORS for the list of contributors
chris@1:  *
chris@1:  *   This program is free software: you can redistribute it and/or modify
chris@1:  *   it under the terms of the GNU General Public License as published by
chris@1:  *   the Free Software Foundation, either version 3 of the License, or
chris@1:  *   (at your option) any later version.
chris@1:  *
chris@1:  *   This program is distributed in the hope that it will be useful,
chris@1:  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
chris@1:  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
chris@1:  *   GNU General Public License for more details.
chris@1:  *
chris@1:  *   You should have received a copy of the GNU General Public License
chris@1:  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
chris@1:  */
chris@1: 
chris@1: package org.sonews.daemon.command;
chris@1: 
chris@1: import java.io.IOException;
chris@1: import java.util.List;
cli@17: import java.util.regex.Matcher;
cli@17: import java.util.regex.Pattern;
cli@17: import java.util.regex.PatternSyntaxException;
chris@1: import org.sonews.daemon.NNTPConnection;
chris@3: import org.sonews.storage.Channel;
chris@3: import org.sonews.storage.StorageBackendException;
cli@17: import org.sonews.util.Log;
chris@1: 
chris@1: /**
chris@1:  * Class handling the LIST command.
chris@1:  * @author Christian Lins
chris@1:  * @author Dennis Schwerdel
chris@1:  * @since n3tpd/0.1
chris@1:  */
chris@3: public class ListCommand implements Command
chris@1: {
chris@1: 
cli@37: 	@Override
cli@37: 	public String[] getSupportedCommandStrings()
cli@37: 	{
cli@37: 		return new String[] {"LIST"};
cli@37: 	}
chris@1: 
cli@37: 	@Override
cli@37: 	public boolean hasFinished()
cli@37: 	{
cli@37: 		return true;
cli@37: 	}
chris@3: 
cli@37: 	@Override
cli@37: 	public String impliedCapability()
cli@37: 	{
cli@37: 		return null;
cli@37: 	}
cli@20: 
cli@37: 	@Override
cli@37: 	public boolean isStateful()
cli@37: 	{
cli@37: 		return false;
cli@37: 	}
cli@12: 
cli@37: 	@Override
cli@37: 	public void processLine(NNTPConnection conn, final String line, byte[] raw)
cli@37: 		throws IOException, StorageBackendException
cli@37: 	{
cli@37: 		final String[] command = line.split(" ");
chris@1: 
cli@37: 		if (command.length >= 2) {
cli@37: 			if (command[1].equalsIgnoreCase("OVERVIEW.FMT")) {
cli@37: 				conn.println("215 information follows");
cli@37: 				conn.println("Subject:\nFrom:\nDate:\nMessage-ID:\nReferences:\nBytes:\nLines:\nXref");
cli@37: 				conn.println(".");
cli@37: 			} else if (command[1].equalsIgnoreCase("NEWSGROUPS")) {
cli@37: 				conn.println("215 information follows");
cli@37: 				final List<Channel> list = Channel.getAll();
cli@37: 				for (Channel g : list) {
cli@37: 					conn.println(g.getName() + "\t" + "-");
cli@37: 				}
cli@37: 				conn.println(".");
cli@37: 			} else if (command[1].equalsIgnoreCase("SUBSCRIPTIONS")) {
cli@37: 				conn.println("215 information follows");
cli@37: 				conn.println(".");
cli@37: 			} else if (command[1].equalsIgnoreCase("EXTENSIONS")) {
cli@37: 				conn.println("202 Supported NNTP extensions.");
cli@37: 				conn.println("LISTGROUP");
cli@37: 				conn.println("XDAEMON");
cli@37: 				conn.println("XPAT");
cli@37: 				conn.println(".");
cli@37: 			} else if (command[1].equalsIgnoreCase("ACTIVE")) {
cli@37: 				String pattern = command.length == 2
cli@37: 					? null : command[2].replace("*", "\\w*");
cli@37: 				printGroupInfo(conn, pattern);
cli@37: 			} else {
cli@37: 				conn.println("500 unknown argument to LIST command");
cli@37: 			}
cli@37: 		} else {
cli@37: 			printGroupInfo(conn, null);
cli@37: 		}
cli@37: 	}
cli@37: 
cli@37: 	private void printGroupInfo(NNTPConnection conn, String pattern)
cli@37: 		throws IOException, StorageBackendException
cli@37: 	{
cli@37: 		final List<Channel> groups = Channel.getAll();
cli@37: 		if (groups != null) {
cli@37: 			conn.println("215 list of newsgroups follows");
cli@37: 			for (Channel g : groups) {
cli@37: 				try {
cli@37: 					Matcher matcher = pattern == null
cli@37: 						? null : Pattern.compile(pattern).matcher(g.getName());
cli@37: 					if (!g.isDeleted()
cli@37: 						&& (matcher == null || matcher.find())) {
cli@37: 						String writeable = g.isWriteable() ? " y" : " n";
cli@37: 						// Indeed first the higher article number then the lower
cli@37: 						conn.println(g.getName() + " " + g.getLastArticleNumber() + " "
cli@37: 							+ g.getFirstArticleNumber() + writeable);
cli@37: 					}
cli@37: 				} catch (PatternSyntaxException ex) {
cli@37: 					Log.get().info(ex.toString());
cli@37: 				}
cli@37: 			}
cli@37: 			conn.println(".");
cli@37: 		} else {
cli@37: 			conn.println("500 server backend malfunction");
cli@37: 		}
cli@37: 	}
chris@1: }