src/org/sonews/daemon/command/ArticleCommand.java
author František Kučera <franta-hg@frantovo.cz>
Thu Jul 05 13:19:19 2012 +0200 (2012-07-05)
changeset 119 f5b57e221e38
parent 48 b78e77619152
permissions -rwxr-xr-x
mezery, tabulátory
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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 org.sonews.storage.Article;
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import org.sonews.daemon.NNTPConnection;
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import org.sonews.storage.Group;
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import org.sonews.storage.StorageBackendException;
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/**
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 * Class handling the ARTICLE, BODY and HEAD commands.
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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 ArticleCommand implements Command {
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	@Override
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	public String[] getSupportedCommandStrings() {
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		return new String[]{"ARTICLE", "BODY", "HEAD"};
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	}
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	@Override
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	public boolean hasFinished() {
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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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		return null;
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	}
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	@Override
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	public boolean isStateful() {
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		return false;
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	}
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	// TODO: Refactor this method to reduce its complexity!
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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 {
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		final String[] command = line.split(" ");
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		Article article = null;
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		long artIndex = -1;
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		if (command.length == 1) {
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			article = conn.getCurrentArticle();
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			if (article == null) {
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				conn.println("420 no current article has been selected");
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				return;
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			}
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		} else if (command[1].matches(NNTPConnection.MESSAGE_ID_PATTERN)) {
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			// Message-ID
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			article = Article.getByMessageID(command[1]);
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			if (article == null) {
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				conn.println("430 no such article found");
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				return;
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			}
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		} else {
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			// Message Number
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			try {
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				Group currentGroup = conn.getCurrentChannel();
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				if (currentGroup == null) {
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					conn.println("400 no group selected");
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					return;
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				}
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				artIndex = Long.parseLong(command[1]);
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				article = currentGroup.getArticle(artIndex);
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			} catch (NumberFormatException ex) {
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				ex.printStackTrace();
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			} catch (StorageBackendException ex) {
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				ex.printStackTrace();
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			}
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			if (article == null) {
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				conn.println("423 no such article number in this group");
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				return;
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			}
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			conn.setCurrentArticle(article);
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		}
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		if (command[0].equalsIgnoreCase("ARTICLE")) {
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			conn.println("220 " + artIndex + " " + article.getMessageID()
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					+ " article retrieved - head and body follow");
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			conn.println(article.getHeaderSource());
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			conn.println("");
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			conn.printlnEscapeDots(article.getBody());
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			conn.println(".");
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		} else if (command[0].equalsIgnoreCase("BODY")) {
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			conn.println("222 " + artIndex + " " + article.getMessageID() + " body");
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			conn.printlnEscapeDots(article.getBody());
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			conn.println(".");
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		} /*
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		 * HEAD: This command is mandatory.
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		 *
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		 * Syntax
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		 *    HEAD message-id
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		 *    HEAD number
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		 *    HEAD
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		 *
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		 * Responses
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		 *
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		 * First form (message-id specified)
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		 *  221 0|n message-id    Headers follow (multi-line)
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		 *  430                   No article with that message-id
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		 *
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		 * Second form (article number specified)
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		 *  221 n message-id      Headers follow (multi-line)
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		 *  412                   No newsgroup selected
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		 *  423                   No article with that number
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		 *
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		 * Third form (current article number used)
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		 *  221 n message-id      Headers follow (multi-line)
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		 *  412                   No newsgroup selected
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		 *  420                   Current article number is invalid
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		 *
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		 * Parameters
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		 *  number        Requested article number
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		 *  n             Returned article number
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		 *  message-id    Article message-id
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		 */ else if (command[0].equalsIgnoreCase("HEAD")) {
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			conn.println("221 " + artIndex + " " + article.getMessageID()
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					+ " Headers follow (multi-line)");
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			conn.println(article.getHeaderSource());
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			conn.println(".");
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		}
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	}
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}