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.io.ByteArrayInputStream;
chris@3: import java.io.ByteArrayOutputStream;
chris@1: import java.sql.SQLException;
chris@3: import java.util.Arrays;
chris@1: import javax.mail.MessagingException;
chris@1: import javax.mail.internet.AddressException;
chris@1: import javax.mail.internet.InternetHeaders;
chris@3: import org.sonews.config.Config;
chris@1: import org.sonews.util.Log;
chris@1: import org.sonews.mlgw.Dispatcher;
chris@3: import org.sonews.storage.Article;
chris@3: import org.sonews.storage.Group;
chris@1: import org.sonews.daemon.NNTPConnection;
chris@3: import org.sonews.storage.Headers;
chris@3: import org.sonews.storage.StorageBackendException;
chris@3: import org.sonews.storage.StorageManager;
chris@1: import org.sonews.feed.FeedManager;
chris@1: import org.sonews.util.Stats;
chris@1: 
chris@1: /**
chris@1:  * Implementation of the POST command. This command requires multiple lines
chris@1:  * from the client, so the handling of asynchronous reading is a little tricky
chris@1:  * to handle.
chris@1:  * @author Christian Lins
chris@1:  * @since sonews/0.5.0
chris@1:  */
chris@3: public class PostCommand implements Command
chris@1: {
chris@1:   
chris@1:   private final Article article   = new Article();
chris@1:   private int           lineCount = 0;
chris@1:   private long          bodySize  = 0;
chris@1:   private InternetHeaders headers = null;
chris@1:   private long          maxBodySize  = 
chris@3:     Config.inst().get(Config.ARTICLE_MAXSIZE, 128) * 1024L; // Size in bytes
chris@1:   private PostState     state     = PostState.WaitForLineOne;
chris@3:   private final ByteArrayOutputStream bufBody   = new ByteArrayOutputStream();
chris@3:   private final StringBuilder         strHead   = new StringBuilder();
chris@3: 
chris@3:   @Override
chris@3:   public String[] getSupportedCommandStrings()
chris@1:   {
chris@3:     return new String[]{"POST"};
chris@1:   }
chris@1: 
chris@1:   @Override
chris@1:   public boolean hasFinished()
chris@1:   {
chris@1:     return this.state == PostState.Finished;
chris@1:   }
chris@1: 
chris@3:   @Override
cli@20:   public String impliedCapability()
cli@20:   {
cli@20:     return null;
cli@20:   }
cli@20: 
cli@20:   @Override
chris@3:   public boolean isStateful()
chris@3:   {
chris@3:     return true;
chris@3:   }
chris@3: 
chris@1:   /**
chris@1:    * Process the given line String. line.trim() was called by NNTPConnection.
chris@1:    * @param line
chris@1:    * @throws java.io.IOException
chris@1:    * @throws java.sql.SQLException
chris@1:    */
chris@1:   @Override // TODO: Refactor this method to reduce complexity!
chris@3:   public void processLine(NNTPConnection conn, String line, byte[] raw)
chris@3:     throws IOException, StorageBackendException
chris@1:   {
chris@1:     switch(state)
chris@1:     {
chris@1:       case WaitForLineOne:
chris@1:       {
chris@1:         if(line.equalsIgnoreCase("POST"))
chris@1:         {
chris@3:           conn.println("340 send article to be posted. End with <CR-LF>.<CR-LF>");
chris@1:           state = PostState.ReadingHeaders;
chris@1:         }
chris@1:         else
chris@1:         {
chris@3:           conn.println("500 invalid command usage");
chris@1:         }
chris@1:         break;
chris@1:       }
chris@1:       case ReadingHeaders:
chris@1:       {
chris@1:         strHead.append(line);
chris@1:         strHead.append(NNTPConnection.NEWLINE);
chris@1:         
chris@1:         if("".equals(line) || ".".equals(line))
chris@1:         {
chris@1:           // we finally met the blank line
chris@1:           // separating headers from body
chris@1:           
chris@1:           try
chris@1:           {
chris@1:             // Parse the header using the InternetHeader class from JavaMail API
chris@1:             headers = new InternetHeaders(
chris@1:               new ByteArrayInputStream(strHead.toString().trim()
chris@3:                 .getBytes(conn.getCurrentCharset())));
chris@1: 
chris@1:             // add the header entries for the article
chris@1:             article.setHeaders(headers);
chris@1:           }
chris@1:           catch (MessagingException e)
chris@1:           {
chris@1:             e.printStackTrace();
chris@3:             conn.println("500 posting failed - invalid header");
chris@1:             state = PostState.Finished;
chris@1:             break;
chris@1:           }
chris@1: 
chris@1:           // Change charset for reading body; 
chris@1:           // for multipart messages UTF-8 is returned
chris@3:           //conn.setCurrentCharset(article.getBodyCharset());
chris@1:           
chris@1:           state = PostState.ReadingBody;
chris@1:           
chris@1:           if(".".equals(line))
chris@1:           {
chris@1:             // Post an article without body
chris@3:             postArticle(conn, article);
chris@1:             state = PostState.Finished;
chris@1:           }
chris@1:         }
chris@1:         break;
chris@1:       }
chris@1:       case ReadingBody:
chris@1:       {
chris@1:         if(".".equals(line))
chris@1:         {    
chris@1:           // Set some headers needed for Over command
chris@1:           headers.setHeader(Headers.LINES, Integer.toString(lineCount));
chris@1:           headers.setHeader(Headers.BYTES, Long.toString(bodySize));
chris@3: 
chris@3:           byte[] body = bufBody.toByteArray();
chris@3:           if(body.length >= 2)
chris@3:           {
chris@3:             // Remove trailing CRLF
chris@3:             body = Arrays.copyOf(body, body.length - 2);
chris@3:           }
chris@3:           article.setBody(body); // set the article body
chris@1:           
chris@3:           postArticle(conn, article);
chris@1:           state = PostState.Finished;
chris@1:         }
chris@1:         else
chris@1:         {
chris@1:           bodySize += line.length() + 1;
chris@1:           lineCount++;
chris@1:           
chris@1:           // Add line to body buffer
chris@3:           bufBody.write(raw, 0, raw.length);
chris@3:           bufBody.write(NNTPConnection.NEWLINE.getBytes());
chris@1:           
chris@1:           if(bodySize > maxBodySize)
chris@1:           {
chris@3:             conn.println("500 article is too long");
chris@1:             state = PostState.Finished;
chris@1:             break;
chris@1:           }
chris@1:         }
chris@1:         break;
chris@1:       }
chris@1:       default:
chris@3:       {
chris@3:         // Should never happen
cli@15:         Log.get().severe("PostCommand::processLine(): already finished...");
chris@3:       }
chris@1:     }
chris@1:   }
chris@1:   
chris@1:   /**
chris@1:    * Article is a control message and needs special handling.
chris@1:    * @param article
chris@1:    */
chris@3:   private void controlMessage(NNTPConnection conn, Article article)
chris@1:     throws IOException
chris@1:   {
chris@1:     String[] ctrl = article.getHeader(Headers.CONTROL)[0].split(" ");
chris@1:     if(ctrl.length == 2) // "cancel <mid>"
chris@1:     {
chris@1:       try
chris@1:       {
chris@3:         StorageManager.current().delete(ctrl[1]);
chris@1:         
chris@1:         // Move cancel message to "control" group
chris@1:         article.setHeader(Headers.NEWSGROUPS, "control");
chris@3:         StorageManager.current().addArticle(article);
chris@3:         conn.println("240 article cancelled");
chris@1:       }
chris@3:       catch(StorageBackendException ex)
chris@1:       {
cli@15:         Log.get().severe(ex.toString());
chris@3:         conn.println("500 internal server error");
chris@1:       }
chris@1:     }
chris@1:     else
chris@1:     {
chris@3:       conn.println("441 unknown control header");
chris@1:     }
chris@1:   }
chris@1:   
chris@3:   private void supersedeMessage(NNTPConnection conn, Article article)
chris@1:     throws IOException
chris@1:   {
chris@1:     try
chris@1:     {
chris@1:       String oldMsg = article.getHeader(Headers.SUPERSEDES)[0];
chris@3:       StorageManager.current().delete(oldMsg);
chris@3:       StorageManager.current().addArticle(article);
chris@3:       conn.println("240 article replaced");
chris@1:     }
chris@3:     catch(StorageBackendException ex)
chris@1:     {
cli@15:       Log.get().severe(ex.toString());
chris@3:       conn.println("500 internal server error");
chris@1:     }
chris@1:   }
chris@1:   
chris@3:   private void postArticle(NNTPConnection conn, Article article)
chris@1:     throws IOException
chris@1:   {
chris@1:     if(article.getHeader(Headers.CONTROL)[0].length() > 0)
chris@1:     {
chris@3:       controlMessage(conn, article);
chris@1:     }
chris@1:     else if(article.getHeader(Headers.SUPERSEDES)[0].length() > 0)
chris@1:     {
chris@3:       supersedeMessage(conn, article);
chris@1:     }
chris@1:     else // Post the article regularily
chris@1:     {
cli@18:       // Circle check; note that Path can already contain the hostname here
cli@18:       String host = Config.inst().get(Config.HOSTNAME, "localhost");
cli@19:       if(article.getHeader(Headers.PATH)[0].indexOf(host + "!", 1) > 0)
cli@18:       {
cli@18:         Log.get().info(article.getMessageID() + " skipped for host " + host);
cli@18:         conn.println("441 I know this article already");
cli@18:         return;
cli@18:       }
cli@18: 
chris@1:       // Try to create the article in the database or post it to
chris@1:       // appropriate mailing list
chris@1:       try
chris@1:       {
chris@1:         boolean success = false;
chris@1:         String[] groupnames = article.getHeader(Headers.NEWSGROUPS)[0].split(",");
chris@1:         for(String groupname : groupnames)
cli@12:         {          
chris@3:           Group group = StorageManager.current().getGroup(groupname);
chris@3:           if(group != null && !group.isDeleted())
chris@1:           {
chris@3:             if(group.isMailingList() && !conn.isLocalConnection())
chris@1:             {
chris@1:               // Send to mailing list; the Dispatcher writes 
chris@1:               // statistics to database
cli@12:               Dispatcher.toList(article, group.getName());
chris@1:               success = true;
chris@1:             }
chris@1:             else
chris@1:             {
chris@1:               // Store in database
chris@3:               if(!StorageManager.current().isArticleExisting(article.getMessageID()))
chris@1:               {
chris@3:                 StorageManager.current().addArticle(article);
chris@1: 
chris@1:                 // Log this posting to statistics
chris@1:                 Stats.getInstance().mailPosted(
chris@1:                   article.getHeader(Headers.NEWSGROUPS)[0]);
chris@1:               }
chris@1:               success = true;
chris@1:             }
chris@1:           }
chris@1:         } // end for
chris@1: 
chris@1:         if(success)
chris@1:         {
chris@3:           conn.println("240 article posted ok");
chris@1:           FeedManager.queueForPush(article);
chris@1:         }
chris@1:         else
chris@1:         {
chris@3:           conn.println("441 newsgroup not found");
chris@1:         }
chris@1:       }
chris@1:       catch(AddressException ex)
chris@1:       {
cli@15:         Log.get().warning(ex.getMessage());
chris@3:         conn.println("441 invalid sender address");
chris@1:       }
chris@1:       catch(MessagingException ex)
chris@1:       {
chris@1:         // A MessageException is thrown when the sender email address is
chris@1:         // invalid or something is wrong with the SMTP server.
chris@1:         System.err.println(ex.getLocalizedMessage());
chris@3:         conn.println("441 " + ex.getClass().getCanonicalName() + ": " + ex.getLocalizedMessage());
chris@1:       }
chris@3:       catch(StorageBackendException ex)
chris@1:       {
chris@1:         ex.printStackTrace();
chris@3:         conn.println("500 internal server error");
chris@1:       }
chris@1:     }
chris@1:   }
chris@1: 
chris@1: }