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: 
chris@3:   @Override
chris@3:   public String[] getSupportedCommandStrings()
chris@1:   {
chris@3:     return new String[]{"LIST"};
chris@1:   }
chris@1: 
chris@1:   @Override
chris@1:   public boolean hasFinished()
chris@1:   {
chris@1:     return true;
chris@1:   }
chris@3: 
chris@3:   @Override
chris@3:   public boolean isStateful()
chris@3:   {
chris@3:     return false;
chris@3:   }
chris@1:   
chris@1:   @Override
chris@3:   public void processLine(NNTPConnection conn, final String line, byte[] raw)
chris@3:     throws IOException, StorageBackendException
chris@1:   {
chris@1:     final String[] command = line.split(" ");
chris@1:     
cli@12:     if(command.length >= 2)
chris@1:     {
cli@12:       if(command[1].equalsIgnoreCase("OVERVIEW.FMT"))
chris@1:       {
chris@3:         conn.println("215 information follows");
chris@3:         conn.println("Subject:\nFrom:\nDate:\nMessage-ID:\nReferences:\nBytes:\nLines:\nXref");
chris@3:         conn.println(".");
chris@1:       }
cli@12:       else if(command[1].equalsIgnoreCase("NEWSGROUPS"))
chris@1:       {
chris@3:         conn.println("215 information follows");
chris@3:         final List<Channel> list = Channel.getAll();
chris@3:         for (Channel g : list)
chris@1:         {
chris@3:           conn.println(g.getName() + "\t" + "-");
chris@1:         }
chris@3:         conn.println(".");
chris@1:       }
cli@12:       else if(command[1].equalsIgnoreCase("SUBSCRIPTIONS"))
chris@1:       {
chris@3:         conn.println("215 information follows");
chris@3:         conn.println(".");
chris@1:       }
cli@12:       else if(command[1].equalsIgnoreCase("EXTENSIONS"))
chris@1:       {
chris@3:         conn.println("202 Supported NNTP extensions.");
chris@3:         conn.println("LISTGROUP");
chris@3:         conn.println("XDAEMON");
chris@3:         conn.println("XPAT");
chris@3:         conn.println(".");
chris@1:       }
cli@12:       else if(command[1].equalsIgnoreCase("ACTIVE"))
cli@12:       {
cli@17:         String  pattern  = command.length == 2
cli@17:           ? null : command[2].replace("*", "\\w*");
cli@17:         printGroupInfo(conn, pattern);
cli@12:       }
chris@1:       else
chris@1:       {
chris@3:         conn.println("500 unknown argument to LIST command");
chris@1:       }
chris@1:     }
chris@1:     else
chris@1:     {
cli@17:       printGroupInfo(conn, null);
cli@12:     }
cli@12:   }
cli@12: 
cli@17:   private void printGroupInfo(NNTPConnection conn, String pattern)
cli@12:     throws IOException, StorageBackendException
cli@12:   {
cli@12:     final List<Channel> groups = Channel.getAll();
cli@17:     if(groups != null)
cli@12:     {
cli@12:       conn.println("215 list of newsgroups follows");
cli@17:       for(Channel g : groups)
chris@1:       {
cli@17:         try
chris@1:         {
cli@17:           Matcher matcher = pattern == null ?
cli@17:             null : Pattern.compile(pattern).matcher(g.getName());
cli@17:           if(!g.isDeleted() &&
cli@17:             (matcher == null || matcher.find()))
cli@17:           {
cli@17:             String writeable = g.isWriteable() ? " y" : " n";
cli@17:             // Indeed first the higher article number then the lower
cli@17:             conn.println(g.getName() + " " + g.getLastArticleNumber() + " "
cli@17:               + g.getFirstArticleNumber() + writeable);
cli@17:           }
cli@17:         }
cli@17:         catch(PatternSyntaxException ex)
cli@17:         {
cli@17:           Log.get().info(ex.toString());
chris@1:         }
chris@1:       }
cli@12:       conn.println(".");
cli@12:     }
cli@12:     else
cli@12:     {
cli@17:       conn.println("500 server backend malfunction");
chris@1:     }
chris@1:   }
chris@1: 
chris@1: }