org/sonews/daemon/command/ArticleCommand.java
author cli
Sat, 01 May 2010 14:27:30 +0200
changeset 28 15d14b110240
parent 20 6ae5e4f8329b
permissions -rw-r--r--
Make mailinglist gateway more reliable, probably.
     1 /*
     2  *   SONEWS News Server
     3  *   see AUTHORS for the list of contributors
     4  *
     5  *   This program is free software: you can redistribute it and/or modify
     6  *   it under the terms of the GNU General Public License as published by
     7  *   the Free Software Foundation, either version 3 of the License, or
     8  *   (at your option) any later version.
     9  *
    10  *   This program is distributed in the hope that it will be useful,
    11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
    12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    13  *   GNU General Public License for more details.
    14  *
    15  *   You should have received a copy of the GNU General Public License
    16  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
    17  */
    18 
    19 package org.sonews.daemon.command;
    20 
    21 import java.io.IOException;
    22 import org.sonews.storage.Article;
    23 import org.sonews.daemon.NNTPConnection;
    24 import org.sonews.storage.Channel;
    25 import org.sonews.storage.StorageBackendException;
    26 
    27 /**
    28  * Class handling the ARTICLE, BODY and HEAD commands.
    29  * @author Christian Lins
    30  * @author Dennis Schwerdel
    31  * @since n3tpd/0.1
    32  */
    33 public class ArticleCommand implements Command
    34 {
    35 
    36   @Override
    37   public String[] getSupportedCommandStrings()
    38   {
    39     return new String[] {"ARTICLE", "BODY", "HEAD"};
    40   }
    41 
    42   @Override
    43   public boolean hasFinished()
    44   {
    45     return true;
    46   }
    47 
    48   @Override
    49   public String impliedCapability()
    50   {
    51     return null;
    52   }
    53 
    54   @Override
    55   public boolean isStateful()
    56   {
    57     return false;
    58   }
    59 
    60   // TODO: Refactor this method to reduce its complexity!
    61   @Override
    62   public void processLine(NNTPConnection conn, final String line, byte[] raw)
    63     throws IOException
    64   {
    65     final String[] command = line.split(" ");
    66     
    67     Article article  = null;
    68     long    artIndex = -1;
    69     if (command.length == 1)
    70     {
    71       article = conn.getCurrentArticle();
    72       if (article == null)
    73       {
    74         conn.println("420 no current article has been selected");
    75         return;
    76       }
    77     }
    78     else if (command[1].matches(NNTPConnection.MESSAGE_ID_PATTERN))
    79     {
    80       // Message-ID
    81       article = Article.getByMessageID(command[1]);
    82       if (article == null)
    83       {
    84         conn.println("430 no such article found");
    85         return;
    86       }
    87     }
    88     else
    89     {
    90       // Message Number
    91       try
    92       {
    93         Channel currentGroup = conn.getCurrentChannel();
    94         if(currentGroup == null)
    95         {
    96           conn.println("400 no group selected");
    97           return;
    98         }
    99         
   100         artIndex = Long.parseLong(command[1]);
   101         article  = currentGroup.getArticle(artIndex);
   102       }
   103       catch(NumberFormatException ex)
   104       {
   105         ex.printStackTrace();
   106       }
   107       catch(StorageBackendException ex)
   108       {
   109         ex.printStackTrace();
   110       }
   111 
   112       if (article == null)
   113       {
   114         conn.println("423 no such article number in this group");
   115         return;
   116       }
   117       conn.setCurrentArticle(article);
   118     }
   119 
   120     if(command[0].equalsIgnoreCase("ARTICLE"))
   121     {
   122       conn.println("220 " + artIndex + " " + article.getMessageID()
   123           + " article retrieved - head and body follow");
   124       conn.println(article.getHeaderSource());
   125       conn.println("");
   126       conn.println(article.getBody());
   127       conn.println(".");
   128     }
   129     else if(command[0].equalsIgnoreCase("BODY"))
   130     {
   131       conn.println("222 " + artIndex + " " + article.getMessageID() + " body");
   132       conn.println(article.getBody());
   133       conn.println(".");
   134     }
   135     
   136     /*
   137      * HEAD: This command is mandatory.
   138      *
   139      * Syntax
   140      *    HEAD message-id
   141      *    HEAD number
   142      *    HEAD
   143      *
   144      * Responses
   145      *
   146      * First form (message-id specified)
   147      *  221 0|n message-id    Headers follow (multi-line)
   148      *  430                   No article with that message-id
   149      *
   150      * Second form (article number specified)
   151      *  221 n message-id      Headers follow (multi-line)
   152      *  412                   No newsgroup selected
   153      *  423                   No article with that number
   154      *
   155      * Third form (current article number used)
   156      *  221 n message-id      Headers follow (multi-line)
   157      *  412                   No newsgroup selected
   158      *  420                   Current article number is invalid
   159      *
   160      * Parameters
   161      *  number        Requested article number
   162      *  n             Returned article number
   163      *  message-id    Article message-id
   164      */
   165     else if(command[0].equalsIgnoreCase("HEAD"))
   166     {
   167       conn.println("221 " + artIndex + " " + article.getMessageID()
   168           + " Headers follow (multi-line)");
   169       conn.println(article.getHeaderSource());
   170       conn.println(".");
   171     }
   172   }  
   173   
   174 }