com.turn.ttorrent.cli.TorrentMain.java Source code

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Here is the source code for com.turn.ttorrent.cli.TorrentMain.java

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/**
 * Copyright (C) 2011-2013 Turn, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.turn.ttorrent.cli;

import com.turn.ttorrent.common.Torrent;

import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.io.PrintStream;
import java.net.URI;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Vector;

import jargs.gnu.CmdLineParser;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;
import org.apache.commons.io.filefilter.TrueFileFilter;
import org.apache.log4j.BasicConfigurator;
import org.apache.log4j.ConsoleAppender;
import org.apache.log4j.PatternLayout;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Command-line entry-point for reading and writing {@link Torrent} files.
 */
public class TorrentMain {

    private static final Logger logger = LoggerFactory.getLogger(TorrentMain.class);

    /**
     * Display program usage on the given {@link PrintStream}.
     */
    private static void usage(PrintStream s) {
        usage(s, null);
    }

    /**
     * Display a message and program usage on the given {@link PrintStream}.
     */
    private static void usage(PrintStream s, String msg) {
        if (msg != null) {
            s.println(msg);
            s.println();
        }

        s.println("usage: Torrent [options] [file|directory]");
        s.println();
        s.println("Available options:");
        s.println("  -h,--help             Show this help and exit.");
        s.println("  -t,--torrent FILE     Use FILE to read/write torrent file.");
        s.println();
        s.println("  -c,--create           Create a new torrent file using " + "the given announce URL and data.");
        s.println("  -l,--length           Define the piece length for hashing data");
        s.println("  -a,--announce         Tracker URL (can be repeated).");
        s.println();
    }

    /**
     * Torrent reader and creator.
     *
     * <p>
     * You can use the {@code main()} function of this class to read or create
     * torrent files. See usage for details.
     * </p>
     *
     */
    public static void main(String[] args) {
        BasicConfigurator.configure(new ConsoleAppender(new PatternLayout("%-5p: %m%n")));

        CmdLineParser parser = new CmdLineParser();
        CmdLineParser.Option help = parser.addBooleanOption('h', "help");
        CmdLineParser.Option filename = parser.addStringOption('t', "torrent");
        CmdLineParser.Option create = parser.addBooleanOption('c', "create");
        CmdLineParser.Option pieceLength = parser.addIntegerOption('l', "length");
        CmdLineParser.Option announce = parser.addStringOption('a', "announce");

        try {
            parser.parse(args);
        } catch (CmdLineParser.OptionException oe) {
            System.err.println(oe.getMessage());
            usage(System.err);
            System.exit(1);
        }

        // Display help and exit if requested
        if (Boolean.TRUE.equals((Boolean) parser.getOptionValue(help))) {
            usage(System.out);
            System.exit(0);
        }

        String filenameValue = (String) parser.getOptionValue(filename);
        if (filenameValue == null) {
            usage(System.err, "Torrent file must be provided!");
            System.exit(1);
        }

        Integer pieceLengthVal = (Integer) parser.getOptionValue(pieceLength);
        if (pieceLengthVal == null) {
            pieceLengthVal = Torrent.DEFAULT_PIECE_LENGTH;
        } else {
            pieceLengthVal = pieceLengthVal * 1024;
        }
        logger.info("Using piece length of {} bytes.", pieceLengthVal);

        Boolean createFlag = (Boolean) parser.getOptionValue(create);

        //For repeated announce urls
        @SuppressWarnings("unchecked")
        Vector<String> announceURLs = (Vector<String>) parser.getOptionValues(announce);

        String[] otherArgs = parser.getRemainingArgs();

        if (Boolean.TRUE.equals(createFlag) && (otherArgs.length != 1 || announceURLs.isEmpty())) {
            usage(System.err,
                    "Announce URL and a file or directory must be " + "provided to create a torrent file!");
            System.exit(1);
        }

        OutputStream fos = null;
        try {
            if (Boolean.TRUE.equals(createFlag)) {
                if (filenameValue != null) {
                    fos = new FileOutputStream(filenameValue);
                } else {
                    fos = System.out;
                }

                //Process the announce URLs into URIs
                List<URI> announceURIs = new ArrayList<URI>();
                for (String url : announceURLs) {
                    announceURIs.add(new URI(url));
                }

                //Create the announce-list as a list of lists of URIs
                //Assume all the URI's are first tier trackers
                List<List<URI>> announceList = new ArrayList<List<URI>>();
                announceList.add(announceURIs);

                File source = new File(otherArgs[0]);
                if (!source.exists() || !source.canRead()) {
                    throw new IllegalArgumentException(
                            "Cannot access source file or directory " + source.getName());
                }

                String creator = String.format("%s (ttorrent)", System.getProperty("user.name"));

                Torrent torrent = null;
                if (source.isDirectory()) {
                    List<File> files = new ArrayList<File>(
                            FileUtils.listFiles(source, TrueFileFilter.TRUE, TrueFileFilter.TRUE));
                    Collections.sort(files);
                    torrent = Torrent.create(source, files, pieceLengthVal, announceList, creator);
                } else {
                    torrent = Torrent.create(source, pieceLengthVal, announceList, creator);
                }

                torrent.save(fos);
            } else {
                Torrent.load(new File(filenameValue), true);
            }
        } catch (Exception e) {
            logger.error("{}", e.getMessage(), e);
            System.exit(2);
        } finally {
            if (fos != System.out) {
                IOUtils.closeQuietly(fos);
            }
        }
    }
}