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 .
chris@1: */
chris@1:
chris@1: package org.sonews.daemon.command;
chris@1:
chris@1: import java.io.IOException;
chris@3: import java.util.List;
chris@3: import java.util.Locale;
chris@3: import java.util.regex.PatternSyntaxException;
chris@1: import org.sonews.daemon.NNTPConnection;
chris@3: import org.sonews.storage.StorageBackendException;
chris@3: import org.sonews.storage.StorageManager;
chris@3: import org.sonews.util.Pair;
chris@1:
chris@1: /**
chris@1: *
chris@1: * XPAT header range| pat [pat...]
chris@1: *
chris@1: * The XPAT command is used to retrieve specific headers from
chris@1: * specific articles, based on pattern matching on the contents of
chris@1: * the header. This command was first available in INN.
chris@1: *
chris@1: * The required header parameter is the name of a header line (e.g.
chris@1: * "subject") in a news group article. See RFC-1036 for a list
chris@1: * of valid header lines. The required range argument may be
chris@1: * any of the following:
chris@1: * an article number
chris@1: * an article number followed by a dash to indicate
chris@1: * all following
chris@1: * an article number followed by a dash followed by
chris@1: * another article number
chris@1: *
chris@1: * The required message-id argument indicates a specific
chris@1: * article. The range and message-id arguments are mutually
chris@1: * exclusive. At least one pattern in wildmat must be specified
chris@1: * as well. If there are additional arguments the are joined
chris@1: * together separated by a single space to form one complete
chris@1: * pattern. Successful responses start with a 221 response
chris@1: * followed by a the headers from all messages in which the
chris@1: * pattern matched the contents of the specified header line. This
chris@1: * includes an empty list. Once the output is complete, a period
chris@1: * is sent on a line by itself. If the optional argument is a
chris@1: * message-id and no such article exists, the 430 error response
chris@1: * is returned. A 502 response will be returned if the client only
chris@1: * has permission to transfer articles.
chris@1: *
chris@1: * Responses
chris@1: *
chris@1: * 221 Header follows
chris@1: * 430 no such article
chris@1: * 502 no permission
chris@3: *
chris@3: * Response Data:
chris@3: *
chris@3: * art_nr fitting_header_value
chris@3: *
chris@1: *
chris@1: * [Source:"draft-ietf-nntp-imp-02.txt"] [Copyright: 1998 S. Barber]
chris@1: *
chris@1: * @author Christian Lins
chris@1: * @since sonews/0.5.0
chris@1: */
chris@3: public class XPatCommand implements Command
chris@1: {
chris@1:
chris@3: @Override
chris@3: public String[] getSupportedCommandStrings()
chris@1: {
chris@3: return new String[]{"XPAT"};
chris@1: }
chris@1:
chris@1: @Override
chris@1: public boolean hasFinished()
chris@1: {
chris@1: return true;
chris@1: }
chris@1:
chris@1: @Override
chris@3: public boolean isStateful()
chris@1: {
chris@3: return false;
chris@3: }
chris@3:
chris@3: @Override
chris@3: public void processLine(NNTPConnection conn, final String line, byte[] raw)
chris@3: throws IOException, StorageBackendException
chris@3: {
chris@3: if(conn.getCurrentChannel() == null)
chris@3: {
chris@3: conn.println("430 no group selected");
chris@3: return;
chris@3: }
chris@3:
chris@3: String[] command = line.split("\\p{Space}+");
chris@3:
chris@3: // There may be multiple patterns and Thunderbird produces
chris@3: // additional spaces between range and pattern
chris@3: if(command.length >= 4)
chris@3: {
chris@3: String header = command[1].toLowerCase(Locale.US);
chris@3: String range = command[2];
chris@3: String pattern = command[3];
chris@3:
chris@3: long start = -1;
chris@3: long end = -1;
chris@3: if(range.contains("-"))
chris@3: {
chris@3: String[] rsplit = range.split("-", 2);
chris@3: start = Long.parseLong(rsplit[0]);
chris@3: if(rsplit[1].length() > 0)
chris@3: {
chris@3: end = Long.parseLong(rsplit[1]);
chris@3: }
chris@3: }
chris@3: else // TODO: Handle Message-IDs
chris@3: {
chris@3: start = Long.parseLong(range);
chris@3: }
chris@3:
chris@3: try
chris@3: {
chris@3: List> heads = StorageManager.current().
chris@3: getArticleHeaders(conn.getCurrentChannel(), start, end, header, pattern);
chris@3:
chris@3: conn.println("221 header follows");
chris@3: for(Pair head : heads)
chris@3: {
chris@3: conn.println(head.getA() + " " + head.getB());
chris@3: }
chris@3: conn.println(".");
chris@3: }
chris@3: catch(PatternSyntaxException ex)
chris@3: {
chris@3: ex.printStackTrace();
chris@3: conn.println("500 invalid pattern syntax");
chris@3: }
chris@3: catch(StorageBackendException ex)
chris@3: {
chris@3: ex.printStackTrace();
chris@3: conn.println("500 internal server error");
chris@3: }
chris@3: }
chris@3: else
chris@3: {
chris@3: conn.println("430 invalid command usage");
chris@3: }
chris@1: }
chris@1:
chris@1: }