org/sonews/daemon/command/ListCommand.java
author cli
Sun, 29 Aug 2010 17:03:21 +0200
changeset 33 f9bf183447d1
parent 20 6ae5e4f8329b
permissions -rw-r--r--
Article(javax.mail.Message) now has a safe method to read the byte body from the given message object (fixes #16).
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/*
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 *   SONEWS News Server
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 *   see AUTHORS for the list of contributors
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 *
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 *   This program is free software: you can redistribute it and/or modify
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 *   it under the terms of the GNU General Public License as published by
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 *   the Free Software Foundation, either version 3 of the License, or
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 *   (at your option) any later version.
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 *
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 *   This program is distributed in the hope that it will be useful,
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 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *   GNU General Public License for more details.
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 *
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 *   You should have received a copy of the GNU General Public License
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 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
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 */
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package org.sonews.daemon.command;
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import java.io.IOException;
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import java.util.List;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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import java.util.regex.PatternSyntaxException;
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import org.sonews.daemon.NNTPConnection;
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import org.sonews.storage.Channel;
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import org.sonews.storage.StorageBackendException;
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import org.sonews.util.Log;
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/**
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 * Class handling the LIST command.
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 * @author Christian Lins
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 * @author Dennis Schwerdel
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 * @since n3tpd/0.1
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 */
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public class ListCommand implements Command
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{
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  @Override
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  public String[] getSupportedCommandStrings()
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  {
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    return new String[]{"LIST"};
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  }
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  @Override
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  public boolean hasFinished()
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  {
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    return true;
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  }
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  @Override
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  public String impliedCapability()
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  {
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    return null;
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  }
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  @Override
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  public boolean isStateful()
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  {
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    return false;
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  }
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  @Override
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  public void processLine(NNTPConnection conn, final String line, byte[] raw)
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    throws IOException, StorageBackendException
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  {
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    final String[] command = line.split(" ");
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    if(command.length >= 2)
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    {
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      if(command[1].equalsIgnoreCase("OVERVIEW.FMT"))
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      {
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        conn.println("215 information follows");
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        conn.println("Subject:\nFrom:\nDate:\nMessage-ID:\nReferences:\nBytes:\nLines:\nXref");
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        conn.println(".");
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      }
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      else if(command[1].equalsIgnoreCase("NEWSGROUPS"))
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      {
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        conn.println("215 information follows");
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        final List<Channel> list = Channel.getAll();
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        for (Channel g : list)
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        {
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          conn.println(g.getName() + "\t" + "-");
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        }
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        conn.println(".");
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      }
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      else if(command[1].equalsIgnoreCase("SUBSCRIPTIONS"))
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      {
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        conn.println("215 information follows");
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        conn.println(".");
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      }
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      else if(command[1].equalsIgnoreCase("EXTENSIONS"))
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      {
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        conn.println("202 Supported NNTP extensions.");
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        conn.println("LISTGROUP");
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        conn.println("XDAEMON");
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        conn.println("XPAT");
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        conn.println(".");
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      }
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      else if(command[1].equalsIgnoreCase("ACTIVE"))
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      {
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        String  pattern  = command.length == 2
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          ? null : command[2].replace("*", "\\w*");
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        printGroupInfo(conn, pattern);
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      }
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      else
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      {
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        conn.println("500 unknown argument to LIST command");
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      }
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    }
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    else
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    {
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      printGroupInfo(conn, null);
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    }
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  }
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  private void printGroupInfo(NNTPConnection conn, String pattern)
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    throws IOException, StorageBackendException
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  {
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    final List<Channel> groups = Channel.getAll();
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    if(groups != null)
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    {
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      conn.println("215 list of newsgroups follows");
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      for(Channel g : groups)
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      {
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        try
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        {
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          Matcher matcher = pattern == null ?
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            null : Pattern.compile(pattern).matcher(g.getName());
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          if(!g.isDeleted() &&
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            (matcher == null || matcher.find()))
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          {
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            String writeable = g.isWriteable() ? " y" : " n";
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            // Indeed first the higher article number then the lower
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            conn.println(g.getName() + " " + g.getLastArticleNumber() + " "
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              + g.getFirstArticleNumber() + writeable);
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          }
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        }
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        catch(PatternSyntaxException ex)
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        {
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          Log.get().info(ex.toString());
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        }
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      }
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      conn.println(".");
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    }
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    else
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    {
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      conn.println("500 server backend malfunction");
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    }
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  }
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}