2 * XdccDownloader - Core.java - Copyright © 2013 David Roden
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 3 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 package net.pterodactylus.xdcc.core;
20 import static net.pterodactylus.xdcc.data.Download.FILTER_RUNNING;
23 import java.io.FileNotFoundException;
24 import java.io.FileOutputStream;
25 import java.io.IOException;
26 import java.io.OutputStream;
27 import java.util.Collection;
28 import java.util.Collections;
29 import java.util.Iterator;
30 import java.util.List;
32 import java.util.Map.Entry;
33 import java.util.concurrent.TimeUnit;
34 import java.util.logging.Level;
35 import java.util.logging.Logger;
37 import net.pterodactylus.irc.Connection;
38 import net.pterodactylus.irc.ConnectionBuilder;
39 import net.pterodactylus.irc.DccReceiver;
40 import net.pterodactylus.irc.event.ChannelJoined;
41 import net.pterodactylus.irc.event.ChannelLeft;
42 import net.pterodactylus.irc.event.ChannelMessageReceived;
43 import net.pterodactylus.irc.event.ClientQuit;
44 import net.pterodactylus.irc.event.ConnectionClosed;
45 import net.pterodactylus.irc.event.ConnectionEstablished;
46 import net.pterodactylus.irc.event.DccAcceptReceived;
47 import net.pterodactylus.irc.event.DccDownloadFailed;
48 import net.pterodactylus.irc.event.DccDownloadFinished;
49 import net.pterodactylus.irc.event.DccSendReceived;
50 import net.pterodactylus.irc.event.NicknameChanged;
51 import net.pterodactylus.irc.event.PrivateNoticeReceived;
52 import net.pterodactylus.irc.event.PrivateMessageReceived;
53 import net.pterodactylus.irc.util.MessageCleaner;
54 import net.pterodactylus.irc.util.RandomNickname;
55 import net.pterodactylus.xdcc.core.event.BotAdded;
56 import net.pterodactylus.xdcc.core.event.CoreStarted;
57 import net.pterodactylus.xdcc.core.event.DownloadFailed;
58 import net.pterodactylus.xdcc.core.event.DownloadFinished;
59 import net.pterodactylus.xdcc.core.event.DownloadStarted;
60 import net.pterodactylus.xdcc.core.event.GenericError;
61 import net.pterodactylus.xdcc.core.event.GenericMessage;
62 import net.pterodactylus.xdcc.core.event.MessageReceived;
63 import net.pterodactylus.xdcc.data.Bot;
64 import net.pterodactylus.xdcc.data.Channel;
65 import net.pterodactylus.xdcc.data.Download;
66 import net.pterodactylus.xdcc.data.Network;
67 import net.pterodactylus.xdcc.data.Pack;
68 import net.pterodactylus.xdcc.data.Server;
70 import com.google.common.base.Optional;
71 import com.google.common.base.Predicate;
72 import com.google.common.collect.FluentIterable;
73 import com.google.common.collect.HashBasedTable;
74 import com.google.common.collect.HashMultimap;
75 import com.google.common.collect.ImmutableList;
76 import com.google.common.collect.ImmutableSet;
77 import com.google.common.collect.Lists;
78 import com.google.common.collect.Maps;
79 import com.google.common.collect.Multimap;
80 import com.google.common.collect.Sets;
81 import com.google.common.collect.Table;
82 import com.google.common.eventbus.EventBus;
83 import com.google.common.eventbus.Subscribe;
84 import com.google.common.io.Closeables;
85 import com.google.common.util.concurrent.AbstractExecutionThreadService;
86 import com.google.inject.Inject;
89 * The core of XDCC Downloader.
91 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
93 public class Core extends AbstractExecutionThreadService {
96 private static final Logger logger = Logger.getLogger(Core.class.getName());
99 private final EventBus eventBus;
101 /** The temporary directory to download files to. */
102 private final String temporaryDirectory;
104 /** The directory to move finished downloads to. */
105 private final String finalDirectory;
107 /** The channels that should be monitored. */
108 private final Collection<Channel> channels = Sets.newHashSet();
110 /** The channels that are currentlymonitored. */
111 private final Collection<Channel> joinedChannels = Sets.newHashSet();
113 /** The channels that are joined but not configured. */
114 private final Collection<Channel> extraChannels = Sets.newHashSet();
116 /** The current network connections. */
117 private final Map<Network, Connection> networkConnections = Collections.synchronizedMap(Maps.<Network, Connection>newHashMap());
119 /** The currently known bots. */
120 private final Table<Network, String, Bot> networkBots = HashBasedTable.create();
122 /** The current downloads. */
123 private final Multimap<String, Download> downloads = HashMultimap.create();
125 /** The current DCC receivers. */
126 private final Collection<DccReceiver> dccReceivers = Lists.newArrayList();
129 * Creates a new core.
133 * @param temporaryDirectory
134 * The directory to download files to
135 * @param finalDirectory
136 * The directory to move finished files to
139 public Core(EventBus eventBus, String temporaryDirectory, String finalDirectory) {
140 this.eventBus = eventBus;
141 this.temporaryDirectory = temporaryDirectory;
142 this.finalDirectory = finalDirectory;
150 * Returns all configured channels. Due to various circumstances, configured
151 * channels might not actually be joined.
153 * @return All configured channels
155 public Collection<Channel> channels() {
156 return ImmutableSet.copyOf(channels);
160 * Returns all currently joined channels.
162 * @return All currently joined channels
164 public Collection<Channel> joinedChannels() {
165 return ImmutableSet.copyOf(joinedChannels);
169 * Returns all currently joined channels that are not configured.
171 * @return All currently joined but not configured channels
173 public Collection<Channel> extraChannels() {
174 return ImmutableSet.copyOf(extraChannels);
178 * Returns all currently known bots.
180 * @return All currently known bots
182 public Collection<Bot> bots() {
183 return networkBots.values();
187 * Returns all currently running downloads.
189 * @return All currently running downloads
191 public Collection<Download> downloads() {
192 return downloads.values();
200 * Adds a channel to monitor.
203 * The channel to monitor
205 public void addChannel(Channel channel) {
206 channels.add(channel);
210 * Fetches the given pack from the given bot.
213 * The bot to fetch the pack from
217 public void fetch(Bot bot, Pack pack) {
218 Connection connection = networkConnections.get(bot.network());
219 if (connection == null) {
223 Download download = new Download(bot, pack);
224 downloads.put(pack.name(), download);
227 connection.sendMessage(bot.name(), "XDCC SEND " + pack.id());
228 } catch (IOException ioe1) {
229 logger.log(Level.WARNING, "Could not send message to bot!", ioe1);
234 // ABSTRACTIDLESERVICE METHODS
238 protected void startUp() {
239 for (Channel channel : channels) {
240 logger.info(String.format("Connecting to Channel %s on Network %s…", channel.name(), channel.network().name()));
241 connectNetwork(channel.network());
244 /* notify listeners. */
245 eventBus.post(new CoreStarted(this));
249 protected void run() throws Exception {
250 while (isRunning()) {
252 Thread.sleep(TimeUnit.MINUTES.toMillis(1));
253 } catch (InterruptedException ie1) {
257 /* find channels that should be monitored but are not. */
258 for (Channel channel : channels) {
259 if (joinedChannels.contains(channel)) {
263 connectNetwork(channel.network());
264 Connection connection = networkConnections.get(channel.network());
265 if (connection.established()) {
266 eventBus.post(new GenericMessage(String.format("Trying to join %s on %s.", channel.name(), channel.network().name())));
267 connection.joinChannel(channel.name());
274 protected void shutDown() {
282 * Starts a new connection for the given network if no such connection exists
286 * The network to connect to
288 private void connectNetwork(Network network) {
289 if (!networkConnections.containsKey(network)) {
290 /* select a random server. */
291 List<Server> servers = Lists.newArrayList(network.servers());
292 if (servers.isEmpty()) {
293 eventBus.post(new GenericError(String.format("Network %s does not have any servers.", network.name())));
296 Server server = servers.get((int) (Math.random() * servers.size()));
297 Connection connection = new ConnectionBuilder(eventBus).connect(server.hostname()).port(server.unencryptedPorts().iterator().next()).build();
298 connection.username(RandomNickname.get()).realName(RandomNickname.get());
299 networkConnections.put(network, connection);
309 * If a connection to a network has been established, the channels associated
310 * with this network are joined.
312 * @param connectionEstablished
313 * The connection established event
316 public void connectionEstablished(ConnectionEstablished connectionEstablished) {
318 /* get network for connection. */
319 Optional<Network> network = getNetwork(connectionEstablished.connection());
322 if (!network.isPresent()) {
326 /* join all channels on this network. */
327 for (Channel channel : channels) {
328 if (channel.network().equals(network.get())) {
330 connectionEstablished.connection().joinChannel(channel.name());
331 } catch (IOException ioe1) {
332 logger.log(Level.WARNING, String.format("Could not join %s on %s!", channel.name(), network.get().name()), ioe1);
339 * Remove all data stored for a network if the connection is closed.
341 * @param connectionClosed
342 * The connection closed event
345 public void connectionClosed(ConnectionClosed connectionClosed) {
346 Optional<Network> network = getNetwork(connectionClosed.connection());
347 if (!network.isPresent()) {
351 /* find all channels that need to be removed. */
352 for (Collection channels : ImmutableList.of(joinedChannels, extraChannels)) {
353 for (Iterator<Channel> channelIterator = channels.iterator(); channelIterator.hasNext(); ) {
354 Channel joinedChannel = channelIterator.next();
355 if (!joinedChannel.network().equals(network.get())) {
359 channelIterator.remove();
363 /* now remove all bots for that network. */
364 Map<String, Bot> bots = networkBots.row(network.get());
365 int botCount = bots.size();
367 for (Bot bot : bots.values()) {
368 packCount += bot.packs().size();
371 eventBus.post(new GenericMessage(String.format("Network %s disconnected, %d bots removed, %d packs removed.", network.get().name(), botCount, packCount)));
373 /* now remove the network. */
374 networkConnections.remove(network.get());
378 * Shows a message when a channel was joined by us.
380 * @param channelJoined
381 * The channel joined event
384 public void channelJoined(ChannelJoined channelJoined) {
385 if (channelJoined.connection().isSource(channelJoined.client())) {
386 Optional<Network> network = getNetwork(channelJoined.connection());
387 if (!network.isPresent()) {
391 Optional<Channel> channel = getChannel(network.get(), channelJoined.channel());
392 if (!channel.isPresent()) {
393 /* it’s an extra channel. */
394 extraChannels.add(new Channel(network.get(), channelJoined.channel()));
395 logger.info(String.format("Joined extra Channel %s on %s.", channelJoined.channel(), network.get().name()));
399 joinedChannels.add(channel.get());
400 logger.info(String.format("Joined Channel %s on %s.", channelJoined.channel(), network.get().name()));
405 * Removes bots that leave a channel, or channels when it’s us that’s leaving.
408 * The channel left event
411 public void channelLeft(ChannelLeft channelLeft) {
412 Optional<Network> network = getNetwork(channelLeft.connection());
413 if (!network.isPresent()) {
417 Bot bot = networkBots.get(network.get(), channelLeft.client().nick().get());
419 /* maybe it was us? */
420 if (channelLeft.connection().isSource(channelLeft.client())) {
421 Optional<Channel> channel = getChannel(network.get(), channelLeft.channel());
422 if (!channel.isPresent()) {
423 /* maybe it was an extra channel? */
424 channel = getExtraChannel(network.get(), channelLeft.channel());
425 if (!channel.isPresent()) {
426 /* okay, whatever. */
430 extraChannels.remove(channel);
432 channels.remove(channel.get());
435 eventBus.post(new GenericMessage(String.format("Left Channel %s on %s.", channel.get().name(), channel.get().network().name())));
441 Bot removedBot = networkBots.remove(network.get(), channelLeft.client().nick().get());
442 if (removedBot != null) {
443 eventBus.post(new GenericMessage(String.format("Bot %s (%s) was removed, %d packs removed.", removedBot.name(), removedBot.network().name(), removedBot.packs().size())));
448 * Removes a client (which may be a bot) from the table of known bots.
451 * The client quit event
454 public void clientQuit(ClientQuit clientQuit) {
455 Optional<Network> network = getNetwork(clientQuit.connection());
456 if (!network.isPresent()) {
460 Bot removedBot = networkBots.remove(network.get(), clientQuit.client().nick().get());
461 if (removedBot != null) {
462 eventBus.post(new GenericMessage(String.format("Bot %s (%s) was removed, %d packs removed.", removedBot.name(), removedBot.network().name(), removedBot.packs().size())));
467 * If the nickname of a bit changes, remove it from the old name and store it
468 * under the new name.
470 * @param nicknameChanged
471 * The nickname changed event
474 public void nicknameChanged(NicknameChanged nicknameChanged) {
475 Optional<Network> network = getNetwork(nicknameChanged.connection());
476 if (!network.isPresent()) {
480 Bot bot = networkBots.remove(network.get(), nicknameChanged.client().nick().get());
485 networkBots.put(network.get(), nicknameChanged.newNickname(), bot);
489 * If a message on a channel is received, it is parsed for pack information
490 * with is then added to a bot.
492 * @param channelMessageReceived
493 * The channel message received event
496 public void channelMessageReceived(ChannelMessageReceived channelMessageReceived) {
497 String message = MessageCleaner.getDefaultInstance().clean(channelMessageReceived.message());
498 if (!message.startsWith("#")) {
499 /* most probably not a pack announcement. */
503 Optional<Network> network = getNetwork(channelMessageReceived.connection());
504 if (!network.isPresent()) {
505 /* message for unknown connection? */
509 /* parse pack information. */
510 Optional<Pack> pack = parsePack(message);
511 if (!pack.isPresent()) {
516 synchronized (networkBots) {
517 if (!networkBots.contains(network.get(), channelMessageReceived.source().nick().get())) {
518 bot = new Bot(network.get()).name(channelMessageReceived.source().nick().get());
519 networkBots.put(network.get(), channelMessageReceived.source().nick().get(), bot);
520 eventBus.post(new BotAdded(bot));
522 bot = networkBots.get(network.get(), channelMessageReceived.source().nick().get());
527 bot.addPack(pack.get());
528 logger.fine(String.format("Bot %s now has %d packs.", bot, bot.packs().size()));
532 * Forward all private messages to every console.
534 * @param privateMessageReceived
535 * The private message recevied event
538 public void privateMessageReceived(PrivateMessageReceived privateMessageReceived) {
539 eventBus.post(new MessageReceived(privateMessageReceived.source(), privateMessageReceived.message()));
543 * Sends a message to all console when a notice was received.
545 * @param privateNoticeReceived
546 * The notice received event
549 public void privateNoticeReceived(PrivateNoticeReceived privateNoticeReceived) {
550 Optional<Network> network = getNetwork(privateNoticeReceived.connection());
551 if (!network.isPresent()) {
555 eventBus.post(new GenericMessage(String.format("Notice from %s (%s): %s", privateNoticeReceived.reply().source(), network.get(), privateNoticeReceived.text())));
559 * Starts a DCC download.
561 * @param dccSendReceived
565 public void dccSendReceived(final DccSendReceived dccSendReceived) {
566 final Optional<Network> network = getNetwork(dccSendReceived.connection());
567 if (!network.isPresent()) {
571 Collection<Download> packDownloads = downloads.get(dccSendReceived.filename());
572 if (packDownloads.isEmpty()) {
573 /* unknown download, ignore. */
577 /* check if it’s already downloading. */
578 Collection<Download> runningDownloads = FluentIterable.from(packDownloads).filter(FILTER_RUNNING).toSet();
579 if (!runningDownloads.isEmpty()) {
580 eventBus.post(new GenericMessage(String.format("Ignoring offer for %s, it’s already being downloaded.", dccSendReceived.filename())));
584 /* locate the correct download. */
585 Collection<Download> requestedDownload = FluentIterable.from(packDownloads).filter(new Predicate<Download>() {
588 public boolean apply(Download download) {
589 return download.bot().network().equals(network.get()) && download.bot().name().equalsIgnoreCase(dccSendReceived.source().nick().get());
593 /* we did not request this download. */
594 if (requestedDownload.isEmpty()) {
598 Download download = requestedDownload.iterator().next();
600 /* check if the file already exists. */
601 File outputFile = new File(temporaryDirectory, dccSendReceived.filename());
602 if (outputFile.exists()) {
603 long existingFileSize = outputFile.length();
605 /* file already complete? */
606 if ((dccSendReceived.filesize() > -1) && (existingFileSize >= dccSendReceived.filesize())) {
607 /* file is apparently already complete. just move it. */
608 if (outputFile.renameTo(new File(finalDirectory, download.pack().name()))) {
609 eventBus.post(new GenericMessage(String.format("File %s already downloaded.", download.pack().name())));
611 eventBus.post(new GenericMessage(String.format("File %s already downloaded but not moved to %s.", download.pack().name(), finalDirectory)));
614 /* remove download. */
615 downloads.removeAll(download.pack().name());
619 /* file not complete yet, DCC resume it. */
621 download.remoteAddress(dccSendReceived.inetAddress()).filesize(dccSendReceived.filesize());
622 dccSendReceived.connection().sendDccResume(dccSendReceived.source().nick().get(), dccSendReceived.filename(), dccSendReceived.port(), existingFileSize);
623 } catch (IOException ioe1) {
624 eventBus.post(new GenericError(String.format("Could not send DCC RESUME %s to %s (%s).", dccSendReceived.filename(), dccSendReceived.source().nick().get(), ioe1.getMessage())));
630 /* file does not exist, start the download. */
632 OutputStream fileOutputStream = new FileOutputStream(outputFile);
633 DccReceiver dccReceiver = new DccReceiver(eventBus, dccSendReceived.inetAddress(), dccSendReceived.port(), dccSendReceived.filename(), dccSendReceived.filesize(), fileOutputStream);
634 download.filename(outputFile.getPath()).outputStream(fileOutputStream).dccReceiver(dccReceiver);
635 dccReceivers.add(dccReceiver);
637 eventBus.post(new DownloadStarted(download));
638 } catch (FileNotFoundException fnfe1) {
639 eventBus.post(new GenericError(String.format("Could not start download of %s from %s (%s).", dccSendReceived.filename(), dccSendReceived.source().nick().get(), fnfe1.getMessage())));
644 public void dccAcceptReceived(final DccAcceptReceived dccAcceptReceived) {
645 final Optional<Network> network = getNetwork(dccAcceptReceived.connection());
646 if (!network.isPresent()) {
650 Collection<Download> packDownloads = downloads.get(dccAcceptReceived.filename());
651 if (packDownloads.isEmpty()) {
652 /* unknown download, ignore. */
656 /* check if it’s already downloading. */
657 Collection<Download> runningDownloads = FluentIterable.from(packDownloads).filter(FILTER_RUNNING).toSet();
658 if (!runningDownloads.isEmpty()) {
659 eventBus.post(new GenericMessage(String.format("Ignoring offer for %s, it’s already being downloaded.", dccAcceptReceived.filename())));
663 /* locate the correct download. */
664 Collection<Download> requestedDownload = FluentIterable.from(packDownloads).filter(new Predicate<Download>() {
667 public boolean apply(Download download) {
668 return download.bot().network().equals(network.get()) && download.bot().name().equalsIgnoreCase(dccAcceptReceived.source().nick().get());
672 /* we did not request this download. */
673 if (requestedDownload.isEmpty()) {
677 Download download = requestedDownload.iterator().next();
680 File outputFile = new File(temporaryDirectory, dccAcceptReceived.filename());
681 if (outputFile.length() != dccAcceptReceived.position()) {
682 eventBus.post(new GenericError(String.format("Download %s from %s does not start at the right position!")));
683 logger.log(Level.WARNING, String.format("Download %s from %s: have %d bytes but wants to resume from %d!", dccAcceptReceived.filename(), dccAcceptReceived.source(), outputFile.length(), dccAcceptReceived.position()));
685 downloads.removeAll(download.pack().name());
688 OutputStream outputStream = new FileOutputStream(outputFile, true);
689 DccReceiver dccReceiver = new DccReceiver(eventBus, download.remoteAddress(), dccAcceptReceived.port(), dccAcceptReceived.filename(), dccAcceptReceived.position(), download.filesize(), outputStream);
690 download.filename(outputFile.getPath()).outputStream(outputStream).dccReceiver(dccReceiver);
691 dccReceivers.add(dccReceiver);
693 eventBus.post(new DownloadStarted(download));
694 } catch (FileNotFoundException fnfe1) {
699 * Closes the output stream of the download and moves the file to the final
702 * @param dccDownloadFinished
703 * The DCC download finished event
706 public void dccDownloadFinished(DccDownloadFinished dccDownloadFinished) {
708 /* locate the correct download. */
709 Collection<Download> requestedDownload = FluentIterable.from(downloads.get(dccDownloadFinished.dccReceiver().filename())).filter(FILTER_RUNNING).toSet();
710 if (requestedDownload.isEmpty()) {
711 /* this seems wrong. */
712 logger.warning("Download finished but could not be located.");
715 Download download = requestedDownload.iterator().next();
718 download.outputStream().close();
719 File file = new File(download.filename());
720 file.renameTo(new File(finalDirectory, download.pack().name()));
721 eventBus.post(new DownloadFinished(download));
722 dccReceivers.remove(dccDownloadFinished.dccReceiver());
723 downloads.removeAll(download.pack().name());
724 } catch (IOException ioe1) {
725 /* TODO - handle all the errors. */
726 logger.log(Level.WARNING, String.format("Could not move file %s to directory %s.", download.filename(), finalDirectory), ioe1);
731 * Closes the output stream and notifies all listeners of the failure.
733 * @param dccDownloadFailed
734 * The DCC download failed event
737 public void dccDownloadFailed(DccDownloadFailed dccDownloadFailed) {
739 /* locate the correct download. */
740 Collection<Download> requestedDownload = FluentIterable.from(downloads.get(dccDownloadFailed.dccReceiver().filename())).filter(FILTER_RUNNING).toSet();
741 if (requestedDownload.isEmpty()) {
742 /* this seems wrong. */
743 logger.warning("Download finished but could not be located.");
746 Download download = requestedDownload.iterator().next();
749 Closeables.close(download.outputStream(), true);
750 eventBus.post(new DownloadFailed(download));
751 dccReceivers.remove(dccDownloadFailed.dccReceiver());
752 downloads.removeAll(download.pack().name());
753 } catch (IOException ioe1) {
754 /* swallow silently. */
763 * Searches all current connections for the given connection, returning the
764 * associated network.
767 * The connection to get the network for
768 * @return The network belonging to the connection, or {@link
771 private Optional<Network> getNetwork(Connection connection) {
772 for (Entry<Network, Connection> networkConnectionEntry : networkConnections.entrySet()) {
773 if (networkConnectionEntry.getValue().equals(connection)) {
774 return Optional.of(networkConnectionEntry.getKey());
777 return Optional.absent();
781 * Returns the configured channel for the given network and name.
784 * The network the channel is located on
786 * The name of the channel
787 * @return The configured channel, or {@link Optional#absent()} if no
788 * configured channel matching the given network and name was found
790 public Optional<Channel> getChannel(Network network, String channelName) {
791 for (Channel channel : channels) {
792 if (channel.network().equals(network) && (channel.name().equalsIgnoreCase(channelName))) {
793 return Optional.of(channel);
796 return Optional.absent();
800 * Returns the extra channel for the given network and name.
803 * The network the channel is located on
805 * The name of the channel
806 * @return The extra channel, or {@link Optional#absent()} if no extra channel
807 * matching the given network and name was found
809 public Optional<Channel> getExtraChannel(Network network, String channelName) {
810 for (Channel channel : extraChannels) {
811 if (channel.network().equals(network) && (channel.name().equalsIgnoreCase(channelName))) {
812 return Optional.of(channel);
815 return Optional.absent();
819 * Parses {@link Pack} information from the given message.
822 * The message to parse pack information from
823 * @return The parsed pack, or {@link Optional#absent()} if the message could
824 * not be parsed into a pack
826 private Optional<Pack> parsePack(String message) {
827 int squareOpen = message.indexOf('[');
828 int squareClose = message.indexOf(']', squareOpen);
829 if ((squareOpen == -1) && (squareClose == -1)) {
830 return Optional.absent();
832 String packSize = message.substring(squareOpen + 1, squareClose);
833 String packName = message.substring(message.lastIndexOf(' ') + 1);
834 String packIndex = message.substring(0, message.indexOf(' ')).substring(1);
835 return Optional.of(new Pack(packIndex, packSize, packName));