diff -r 5a4a41cfc0a3 -r ed84c8bdd87b src/org/sonews/mlgw/Dispatcher.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/org/sonews/mlgw/Dispatcher.java	Sun Aug 29 17:28:58 2010 +0200
@@ -0,0 +1,301 @@
+/*
+ *   SONEWS News Server
+ *   see AUTHORS for the list of contributors
+ *
+ *   This program is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.sonews.mlgw;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import javax.mail.Address;
+import javax.mail.Authenticator;
+import javax.mail.Message;
+import javax.mail.MessagingException;
+import javax.mail.PasswordAuthentication;
+import javax.mail.internet.InternetAddress;
+import org.sonews.config.Config;
+import org.sonews.storage.Article;
+import org.sonews.storage.Group;
+import org.sonews.storage.Headers;
+import org.sonews.storage.StorageBackendException;
+import org.sonews.storage.StorageManager;
+import org.sonews.util.Log;
+import org.sonews.util.Stats;
+
+/**
+ * Dispatches messages from mailing list to newsserver or vice versa.
+ * @author Christian Lins
+ * @since sonews/0.5.0
+ */
+public class Dispatcher 
+{
+
+  static class PasswordAuthenticator extends Authenticator
+  {
+    
+    @Override
+    public PasswordAuthentication getPasswordAuthentication()
+    {
+      final String username = 
+        Config.inst().get(Config.MLSEND_USER, "user");
+      final String password = 
+        Config.inst().get(Config.MLSEND_PASSWORD, "mysecret");
+
+      return new PasswordAuthentication(username, password);
+    }
+    
+  }
+
+  /**
+   * Chunks out the email address of the full List-Post header field.
+   * @param listPostValue
+   * @return The matching email address or null
+   */
+  private static String chunkListPost(String listPostValue)
+  {
+    // listPostValue is of form "<mailto:dev@openoffice.org>"
+    Pattern mailPattern = Pattern.compile("(\\w+[-|.])*\\w+@(\\w+.)+\\w+");
+    Matcher mailMatcher = mailPattern.matcher(listPostValue);
+    if(mailMatcher.find())
+    {
+      return listPostValue.substring(mailMatcher.start(), mailMatcher.end());
+    }
+    else
+    {
+      return null;
+    }
+  }
+
+  /**
+   * This method inspects the header of the given message, trying
+   * to find the most appropriate recipient.
+   * @param msg
+   * @param fallback If this is false only List-Post and X-List-Post headers
+   *                 are examined.
+   * @return null or fitting group name for the given message.
+   */
+  private static List<String> getGroupFor(final Message msg, final boolean fallback)
+    throws MessagingException, StorageBackendException
+  {
+    List<String> groups = null;
+
+    // Is there a List-Post header?
+    String[]        listPost = msg.getHeader(Headers.LIST_POST);
+    InternetAddress listPostAddr;
+
+    if(listPost == null || listPost.length == 0 || "".equals(listPost[0]))
+    {
+      // Is there a X-List-Post header?
+      listPost = msg.getHeader(Headers.X_LIST_POST);
+    }
+
+    if(listPost != null && listPost.length > 0 
+      && !"".equals(listPost[0]) && chunkListPost(listPost[0]) != null)
+    {
+      // listPost[0] is of form "<mailto:dev@openoffice.org>"
+      listPost[0]  = chunkListPost(listPost[0]);
+      listPostAddr = new InternetAddress(listPost[0], false);
+      groups = StorageManager.current().getGroupsForList(listPostAddr.getAddress());
+    }
+    else if(fallback)
+    {
+      Log.get().info("Using fallback recipient discovery for: " + msg.getSubject());
+      groups = new ArrayList<String>();
+      // Fallback to TO/CC/BCC addresses
+      Address[] to = msg.getAllRecipients();
+      for(Address toa : to) // Address can have '<' '>' around
+      {
+        if(toa instanceof InternetAddress)
+        {
+          List<String> g = StorageManager.current()
+            .getGroupsForList(((InternetAddress)toa).getAddress());
+          groups.addAll(g);
+        }
+      }
+    }
+    
+    return groups;
+  }
+  
+  /**
+   * Posts a message that was received from a mailing list to the 
+   * appropriate newsgroup.
+   * If the message already exists in the storage, this message checks
+   * if it must be posted in an additional group. This can happen for
+   * crosspostings in different mailing lists.
+   * @param msg
+   */
+  public static boolean toGroup(final Message msg)
+  {
+    try
+    {
+      // Create new Article object
+      Article article = new Article(msg);
+      boolean posted  = false;
+
+      // Check if this mail is already existing the storage
+      boolean updateReq = 
+        StorageManager.current().isArticleExisting(article.getMessageID());
+
+      List<String> newsgroups = getGroupFor(msg, !updateReq);
+      List<String> oldgroups  = new ArrayList<String>();
+      if(updateReq)
+      {
+        // Check for duplicate entries of the same group
+        Article oldArticle = StorageManager.current().getArticle(article.getMessageID());
+        List<Group> oldGroups = oldArticle.getGroups();
+        for(Group oldGroup : oldGroups)
+        {
+          if(!newsgroups.contains(oldGroup.getName()))
+          {
+            oldgroups.add(oldGroup.getName());
+          }
+        }
+      }
+
+      if(newsgroups.size() > 0)
+      {
+        newsgroups.addAll(oldgroups);
+        StringBuilder groups = new StringBuilder();
+        for(int n = 0; n < newsgroups.size(); n++)
+        {
+          groups.append(newsgroups.get(n));
+          if (n + 1 != newsgroups.size())
+          {
+            groups.append(',');
+          }
+        }
+        Log.get().info("Posting to group " + groups.toString());
+
+        article.setGroup(groups.toString());
+        //article.removeHeader(Headers.REPLY_TO);
+        //article.removeHeader(Headers.TO);
+
+        // Write article to database
+        if(updateReq)
+        {
+          Log.get().info("Updating " + article.getMessageID()
+            + " with additional groups");
+          StorageManager.current().delete(article.getMessageID());
+          StorageManager.current().addArticle(article);
+        }
+        else
+        {
+          Log.get().info("Gatewaying " + article.getMessageID() + " to "
+            + article.getHeader(Headers.NEWSGROUPS)[0]);
+          StorageManager.current().addArticle(article);
+          Stats.getInstance().mailGatewayed(
+            article.getHeader(Headers.NEWSGROUPS)[0]);
+        }
+        posted = true;
+      }
+      else
+      {
+        StringBuilder buf = new StringBuilder();
+        for (Address toa : msg.getAllRecipients())
+        {
+          buf.append(' ');
+          buf.append(toa.toString());
+        }
+        buf.append(" " + article.getHeader(Headers.LIST_POST)[0]);
+        Log.get().warning("No group for" + buf.toString());
+      }
+      return posted;
+    }
+    catch(Exception ex)
+    {
+      ex.printStackTrace();
+      return false;
+    }
+  }
+  
+  /**
+   * Mails a message received through NNTP to the appropriate mailing list.
+   * This method MAY be called several times by PostCommand for the same
+   * article.
+   */
+  public static void toList(Article article, String group)
+    throws IOException, MessagingException, StorageBackendException
+  {
+    // Get mailing lists for the group of this article
+    List<String> rcptAddresses = StorageManager.current().getListsForGroup(group);
+
+    if(rcptAddresses == null || rcptAddresses.size() == 0)
+    {
+      Log.get().warning("No ML-address for " + group + " found.");
+      return;
+    }
+
+    for(String rcptAddress : rcptAddresses)
+    {
+      // Compose message and send it via given SMTP-Host
+      String smtpHost = Config.inst().get(Config.MLSEND_HOST, "localhost");
+      int smtpPort = Config.inst().get(Config.MLSEND_PORT, 25);
+      String smtpUser = Config.inst().get(Config.MLSEND_USER, "user");
+      String smtpPw = Config.inst().get(Config.MLSEND_PASSWORD, "mysecret");
+      String smtpFrom = Config.inst().get(
+        Config.MLSEND_ADDRESS, article.getHeader(Headers.FROM)[0]);
+
+      // TODO: Make Article cloneable()
+      article.getMessageID(); // Make sure an ID is existing
+      article.removeHeader(Headers.NEWSGROUPS);
+      article.removeHeader(Headers.PATH);
+      article.removeHeader(Headers.LINES);
+      article.removeHeader(Headers.BYTES);
+
+      article.setHeader("To", rcptAddress);
+      //article.setHeader("Reply-To", listAddress);
+
+      if (Config.inst().get(Config.MLSEND_RW_SENDER, false))
+      {
+        rewriteSenderAddress(article); // Set the SENDER address
+      }
+
+      SMTPTransport smtpTransport = new SMTPTransport(smtpHost, smtpPort);
+      smtpTransport.send(article, smtpFrom, rcptAddress);
+      smtpTransport.close();
+
+      Stats.getInstance().mailGatewayed(group);
+      Log.get().info("MLGateway: Mail " + article.getHeader("Subject")[0]
+        + " was delivered to " + rcptAddress + ".");
+    }
+  }
+  
+  /**
+   * Sets the SENDER header of the given MimeMessage. This might be necessary
+   * for moderated groups that does not allow the "normal" FROM sender.
+   * @param msg
+   * @throws javax.mail.MessagingException
+   */
+  private static void rewriteSenderAddress(Article msg)
+    throws MessagingException
+  {
+    String mlAddress = Config.inst().get(Config.MLSEND_ADDRESS, null);
+
+    if(mlAddress != null)
+    {
+      msg.setHeader(Headers.SENDER, mlAddress);
+    }
+    else
+    {
+      throw new MessagingException("Cannot rewrite SENDER header!");
+    }
+  }
+  
+}