org.sonews.daemon.command.ListCommand.java Source code

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Here is the source code for org.sonews.daemon.command.ListCommand.java

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/*
 *   SONEWS News Server
 *   Copyright (C) 2009-2015  Christian Lins <christian@lins.me>
 *
 *   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.daemon.command;

import java.io.IOException;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;

import org.sonews.daemon.NNTPConnection;
import org.sonews.storage.Group;
import org.sonews.storage.StorageBackendException;
import org.sonews.util.Log;

import org.springframework.stereotype.Component;

/**
 * Class handling the LIST command.
 *
 * @author Christian Lins
 * @author Dennis Schwerdel
 * @since n3tpd/0.1
 */
@Component
public class ListCommand implements Command {

    @Override
    public String[] getSupportedCommandStrings() {
        return new String[] { "LIST" };
    }

    @Override
    public boolean hasFinished() {
        return true;
    }

    @Override
    public String impliedCapability() {
        return null;
    }

    @Override
    public boolean isStateful() {
        return false;
    }

    @Override
    public void processLine(NNTPConnection conn, final String line, byte[] raw)
            throws IOException, StorageBackendException {
        final String[] command = line.split(" ");

        if (command.length >= 2) {
            if (command[1].equalsIgnoreCase("OVERVIEW.FMT")) {
                conn.println("215 information follows");
                conn.println("Subject:\nFrom:\nDate:\nMessage-ID:\nReferences:\nBytes:\nLines:\nXref");
                conn.println(".");
            } else if (command[1].equalsIgnoreCase("NEWSGROUPS")) {
                conn.println("215 information follows");
                final List<Group> list = Group.getAll();
                for (Group g : list) {
                    conn.println(g.getName() + "\t" + "-");
                }
                conn.println(".");
            } else if (command[1].equalsIgnoreCase("SUBSCRIPTIONS")) {
                conn.println("215 information follows");
                conn.println(".");
            } else if (command[1].equalsIgnoreCase("EXTENSIONS")) {
                conn.println("202 Supported NNTP extensions.");
                conn.println("LISTGROUP");
                conn.println("XDAEMON");
                conn.println("XPAT");
                conn.println(".");
            } else if (command[1].equalsIgnoreCase("ACTIVE")) {
                String pattern = command.length == 2 ? null : command[2].replace("*", "\\w*");
                printGroupInfo(conn, pattern);
            } else {
                conn.println("500 unknown argument to LIST command");
            }
        } else {
            printGroupInfo(conn, null);
        }
    }

    private void printGroupInfo(NNTPConnection conn, String pattern) throws IOException, StorageBackendException {
        final List<Group> groups = Group.getAll();
        if (groups != null) {
            conn.println("215 list of newsgroups follows");
            for (Group g : groups) {
                try {
                    Matcher matcher = pattern == null ? null : Pattern.compile(pattern).matcher(g.getName());
                    if (!g.isDeleted() && (matcher == null || matcher.find())) {
                        String writeable = g.isWriteable() ? " y" : " n";
                        // Indeed first the higher article number then the lower
                        conn.println(g.getName() + " " + g.getLastArticleNumber() + " " + g.getFirstArticleNumber()
                                + writeable);
                    }
                } catch (PatternSyntaxException ex) {
                    Log.get().info(ex.toString());
                }
            }
            conn.println(".");
        } else {
            conn.println("500 server backend malfunction");
        }
    }
}