src/main/java/net/pterodactylus/xdcc/core/Core.java

   1 /*
   2  * XdccDownloader - Core.java - Copyright © 2013 David Roden
   3  *
   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.
   8  *
   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.
  13  *
  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/>.
  16  */
  17
  18 package net.pterodactylus.xdcc.core;
  19
  20 import java.io.File;
  21 import java.io.FileNotFoundException;
  22 import java.io.FileOutputStream;
  23 import java.io.IOException;
  24 import java.io.OutputStream;
  25 import java.util.Collection;
  26 import java.util.Collections;
  27 import java.util.List;
  28 import java.util.Map;
  29 import java.util.Map.Entry;
  30 import java.util.logging.Level;
  31 import java.util.logging.Logger;
  32
  33 import net.pterodactylus.irc.Connection;
  34 import net.pterodactylus.irc.ConnectionBuilder;
  35 import net.pterodactylus.irc.DccReceiver;
  36 import net.pterodactylus.irc.event.ChannelJoined;
  37 import net.pterodactylus.irc.event.ChannelLeft;
  38 import net.pterodactylus.irc.event.ChannelMessageReceived;
  39 import net.pterodactylus.irc.event.ClientQuit;
  40 import net.pterodactylus.irc.event.ConnectionEstablished;
  41 import net.pterodactylus.irc.event.DccAcceptReceived;
  42 import net.pterodactylus.irc.event.DccDownloadFailed;
  43 import net.pterodactylus.irc.event.DccDownloadFinished;
  44 import net.pterodactylus.irc.event.DccSendReceived;
  45 import net.pterodactylus.irc.event.PrivateMessageReceived;
  46 import net.pterodactylus.irc.util.MessageCleaner;
  47 import net.pterodactylus.irc.util.RandomNickname;
  48 import net.pterodactylus.xdcc.core.event.BotAdded;
  49 import net.pterodactylus.xdcc.core.event.CoreStarted;
  50 import net.pterodactylus.xdcc.core.event.DownloadFailed;
  51 import net.pterodactylus.xdcc.core.event.DownloadFinished;
  52 import net.pterodactylus.xdcc.core.event.DownloadStarted;
  53 import net.pterodactylus.xdcc.core.event.GenericError;
  54 import net.pterodactylus.xdcc.core.event.GenericMessage;
  55 import net.pterodactylus.xdcc.core.event.MessageReceived;
  56 import net.pterodactylus.xdcc.data.Bot;
  57 import net.pterodactylus.xdcc.data.Channel;
  58 import net.pterodactylus.xdcc.data.Download;
  59 import net.pterodactylus.xdcc.data.Network;
  60 import net.pterodactylus.xdcc.data.Pack;
  61 import net.pterodactylus.xdcc.data.Server;
  62
  63 import com.google.common.base.Optional;
  64 import com.google.common.collect.HashBasedTable;
  65 import com.google.common.collect.ImmutableSet;
  66 import com.google.common.collect.Lists;
  67 import com.google.common.collect.Maps;
  68 import com.google.common.collect.Sets;
  69 import com.google.common.collect.Table;
  70 import com.google.common.eventbus.EventBus;
  71 import com.google.common.eventbus.Subscribe;
  72 import com.google.common.io.Closeables;
  73 import com.google.common.util.concurrent.AbstractIdleService;
  74 import com.google.inject.Inject;
  75
  76 /**
  77  * The core of XDCC Downloader.
  78  *
  79  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  80  */
  81 public class Core extends AbstractIdleService {
  82
  83         /** The logger. */
  84         private static final Logger logger = Logger.getLogger(Core.class.getName());
  85
  86         /** The event bus. */
  87         private final EventBus eventBus;
  88
  89         /** The temporary directory to download files to. */
  90         private final String temporaryDirectory;
  91
  92         /** The directory to move finished downloads to. */
  93         private final String finalDirectory;
  94
  95         /** The channels that should be monitored. */
  96         private final Collection<Channel> channels = Sets.newHashSet();
  97
  98         /** The channels that are currentlymonitored. */
  99         private final Collection<Channel> joinedChannels = Sets.newHashSet();
 100
 101         /** The channels that are joined but not configured. */
 102         private final Collection<Channel> extraChannels = Sets.newHashSet();
 103
 104         /** The current network connections. */
 105         private final Map<Network, Connection> networkConnections = Collections.synchronizedMap(Maps.<Network, Connection>newHashMap());
 106
 107         /** The currently known bots. */
 108         private final Table<Network, String, Bot> networkBots = HashBasedTable.create();
 109
 110         /** The current downloads. */
 111         private final Map<String, Download> downloads = Maps.newHashMap();
 112
 113         /** The current DCC receivers. */
 114         private final Collection<DccReceiver> dccReceivers = Lists.newArrayList();
 115
 116         /**
 117          * Creates a new core.
 118          *
 119          * @param eventBus
 120          *              The event bus
 121          * @param temporaryDirectory
 122          *              The directory to download files to
 123          * @param finalDirectory
 124          *              The directory to move finished files to
 125          */
 126         @Inject
 127         public Core(EventBus eventBus, String temporaryDirectory, String finalDirectory) {
 128                 this.eventBus = eventBus;
 129                 this.temporaryDirectory = temporaryDirectory;
 130                 this.finalDirectory = finalDirectory;
 131         }
 132
 133         //
 134         // ACCESSORS
 135         //
 136
 137         /**
 138          * Returns all configured channels. Due to various circumstances, configured
 139          * channels might not actually be joined.
 140          *
 141          * @return All configured channels
 142          */
 143         public Collection<Channel> channels() {
 144                 return ImmutableSet.copyOf(channels);
 145         }
 146
 147         /**
 148          * Returns all currently joined channels.
 149          *
 150          * @return All currently joined channels
 151          */
 152         public Collection<Channel> joinedChannels() {
 153                 return ImmutableSet.copyOf(joinedChannels);
 154         }
 155
 156         /**
 157          * Returns all currently joined channels that are not configured.
 158          *
 159          * @return All currently joined but not configured channels
 160          */
 161         public Collection<Channel> extraChannels() {
 162                 return ImmutableSet.copyOf(extraChannels);
 163         }
 164
 165         /**
 166          * Returns all currently known bots.
 167          *
 168          * @return All currently known bots
 169          */
 170         public Collection<Bot> bots() {
 171                 return networkBots.values();
 172         }
 173
 174         /**
 175          * Returns the currently active DCC receivers.
 176          *
 177          * @return The currently active DCC receivers
 178          */
 179         public Collection<DccReceiver> dccReceivers() {
 180                 return dccReceivers;
 181         }
 182
 183         //
 184         // ACTIONS
 185         //
 186
 187         /**
 188          * Adds a channel to monitor.
 189          *
 190          * @param channel
 191          *              The channel to monitor
 192          */
 193         public void addChannel(Channel channel) {
 194                 channels.add(channel);
 195         }
 196
 197         /**
 198          * Fetches the given pack from the given bot.
 199          *
 200          * @param bot
 201          *              The bot to fetch the pack from
 202          * @param pack
 203          *              The pack to fetch
 204          */
 205         public void fetch(Bot bot, Pack pack) {
 206                 Connection connection = networkConnections.get(bot.network());
 207                 if (connection == null) {
 208                         return;
 209                 }
 210
 211                 Download download = new Download(bot, pack);
 212                 downloads.put(pack.name(), download);
 213
 214                 try {
 215                         connection.sendMessage(bot.name(), "XDCC SEND " + pack.id());
 216                 } catch (IOException ioe1) {
 217                         logger.log(Level.WARNING, "Could not send message to bot!", ioe1);
 218                 }
 219         }
 220
 221         //
 222         // ABSTRACTIDLESERVICE METHODS
 223         //
 224
 225         @Override
 226         protected void startUp() {
 227                 for (Channel channel : channels) {
 228                         logger.info(String.format("Connecting to Channel %s on Network %s…", channel.name(), channel.network().name()));
 229                         if (!networkConnections.containsKey(channel.network())) {
 230                                 /* select a random server. */
 231                                 List<Server> servers = Lists.newArrayList(channel.network().servers());
 232                                 Server server = servers.get((int) (Math.random() * servers.size()));
 233                                 Connection connection = new ConnectionBuilder(eventBus).connect(server.hostname()).port(server.unencryptedPorts().iterator().next()).build();
 234                                 connection.username(RandomNickname.get()).realName(RandomNickname.get());
 235                                 networkConnections.put(channel.network(), connection);
 236                                 connection.start();
 237                         }
 238                 }
 239
 240                 /* notify listeners. */
 241                 eventBus.post(new CoreStarted(this));
 242         }
 243
 244         @Override
 245         protected void shutDown() {
 246         }
 247
 248         //
 249         // EVENT HANDLERS
 250         //
 251
 252         /**
 253          * If a connection to a network has been established, the channels associated
 254          * with this network are joined.
 255          *
 256          * @param connectionEstablished
 257          *              The connection established event
 258          */
 259         @Subscribe
 260         public void connectionEstablished(ConnectionEstablished connectionEstablished) {
 261
 262                 /* get network for connection. */
 263                 Optional<Network> network = getNetwork(connectionEstablished.connection());
 264
 265                 /* found network? */
 266                 if (!network.isPresent()) {
 267                         return;
 268                 }
 269
 270                 /* join all channels on this network. */
 271                 for (Channel channel : channels) {
 272                         if (channel.network().equals(network.get())) {
 273                                 try {
 274                                         connectionEstablished.connection().joinChannel(channel.name());
 275                                 } catch (IOException ioe1) {
 276                                         logger.log(Level.WARNING, String.format("Could not join %s on %s!", channel.name(), network.get().name()), ioe1);
 277                                 }
 278                         }
 279                 }
 280         }
 281
 282         /**
 283          * Shows a message when a channel was joined by us.
 284          *
 285          * @param channelJoined
 286          *              The channel joined event
 287          */
 288         @Subscribe
 289         public void channelJoined(ChannelJoined channelJoined) {
 290                 if (channelJoined.connection().isSource(channelJoined.client())) {
 291                         Optional<Network> network = getNetwork(channelJoined.connection());
 292                         if (!network.isPresent()) {
 293                                 return;
 294                         }
 295
 296                         Optional<Channel> channel = getChannel(network.get(), channelJoined.channel());
 297                         if (!channel.isPresent()) {
 298                                 /* it’s an extra channel. */
 299                                 extraChannels.add(new Channel(network.get(), channelJoined.channel()));
 300                                 logger.info(String.format("Joined extra Channel %s on %s.", channelJoined.channel(), network.get().name()));
 301                                 return;
 302                         }
 303
 304                         joinedChannels.add(channel.get());
 305                         logger.info(String.format("Joined Channel %s on %s.", channelJoined.channel(), network.get().name()));
 306                 }
 307         }
 308
 309         /**
 310          * Removes bots that leave a channel, or channels when it’s us that’s leaving.
 311          *
 312          * @param channelLeft
 313          *              The channel left event
 314          */
 315         @Subscribe
 316         public void channelLeft(ChannelLeft channelLeft) {
 317                 Optional<Network> network = getNetwork(channelLeft.connection());
 318                 if (!network.isPresent()) {
 319                         return;
 320                 }
 321
 322                 Bot bot = networkBots.get(network.get(), channelLeft.client().nick().get());
 323                 if (bot == null) {
 324                         /* maybe it was us? */
 325                         if (channelLeft.connection().isSource(channelLeft.client())) {
 326                                 Optional<Channel> channel = getChannel(network.get(), channelLeft.channel());
 327                                 if (!channel.isPresent()) {
 328                                         /* maybe it was an extra channel? */
 329                                         channel = getExtraChannel(network.get(), channelLeft.channel());
 330                                         if (!channel.isPresent()) {
 331                                                 /* okay, whatever. */
 332                                                 return;
 333                                         }
 334
 335                                         extraChannels.remove(channel);
 336                                 } else {
 337                                         channels.remove(channel.get());
 338                                 }
 339
 340                                 eventBus.post(new GenericMessage(String.format("Left Channel %s on %s.", channel.get().name(), channel.get().network().name())));
 341                         }
 342
 343                         return;
 344                 }
 345
 346                 Bot removedBot = networkBots.remove(network.get(), channelLeft.client().nick().get());
 347                 if (removedBot != null) {
 348                         eventBus.post(new GenericMessage(String.format("Bot %s (%s) was removed, %d packs removed.", removedBot.name(), removedBot.network().name(), removedBot.packs().size())));
 349                 }
 350         }
 351
 352         /**
 353          * Removes a client (which may be a bot) from the table of known bots.
 354          *
 355          * @param clientQuit
 356          *              The client quit event
 357          */
 358         @Subscribe
 359         public void clientQuit(ClientQuit clientQuit) {
 360                 Optional<Network> network = getNetwork(clientQuit.connection());
 361                 if (!network.isPresent()) {
 362                         return;
 363                 }
 364
 365                 Bot removedBot = networkBots.remove(network.get(), clientQuit.client().nick().get());
 366                 if (removedBot != null) {
 367                         eventBus.post(new GenericMessage(String.format("Bot %s (%s) was removed, %d packs removed.", removedBot.name(), removedBot.network().name(), removedBot.packs().size())));
 368                 }
 369         }
 370
 371         /**
 372          * If a message on a channel is received, it is parsed for pack information
 373          * with is then added to a bot.
 374          *
 375          * @param channelMessageReceived
 376          *              The channel message received event
 377          */
 378         @Subscribe
 379         public void channelMessageReceived(ChannelMessageReceived channelMessageReceived) {
 380                 String message = MessageCleaner.getDefaultInstance().clean(channelMessageReceived.message());
 381                 if (!message.startsWith("#")) {
 382                         /* most probably not a pack announcement. */
 383                         return;
 384                 }
 385
 386                 Optional<Network> network = getNetwork(channelMessageReceived.connection());
 387                 if (!network.isPresent()) {
 388                         /* message for unknown connection? */
 389                         return;
 390                 }
 391
 392                 /* parse pack information. */
 393                 Optional<Pack> pack = parsePack(message);
 394                 if (!pack.isPresent()) {
 395                         return;
 396                 }
 397
 398                 Bot bot;
 399                 synchronized (networkBots) {
 400                         if (!networkBots.contains(network.get(), channelMessageReceived.source().nick().get())) {
 401                                 bot = new Bot(network.get()).name(channelMessageReceived.source().nick().get());
 402                                 networkBots.put(network.get(), channelMessageReceived.source().nick().get(), bot);
 403                                 eventBus.post(new BotAdded(bot));
 404                         } else {
 405                                 bot = networkBots.get(network.get(), channelMessageReceived.source().nick().get());
 406                         }
 407                 }
 408
 409                 /* add pack. */
 410                 bot.addPack(pack.get());
 411                 logger.fine(String.format("Bot %s now has %d packs.", bot, bot.packs().size()));
 412         }
 413
 414         /**
 415          * Forward all private messages to every console.
 416          *
 417          * @param privateMessageReceived
 418          *              The private message recevied event
 419          */
 420         @Subscribe
 421         public void privateMessageReceived(PrivateMessageReceived privateMessageReceived) {
 422                 eventBus.post(new MessageReceived(privateMessageReceived.source(), privateMessageReceived.message()));
 423         }
 424
 425         /**
 426          * Starts a DCC download.
 427          *
 428          * @param dccSendReceived
 429          *              The DCC SEND event
 430          */
 431         @Subscribe
 432         public void dccSendReceived(DccSendReceived dccSendReceived) {
 433                 Optional<Network> network = getNetwork(dccSendReceived.connection());
 434                 if (!network.isPresent()) {
 435                         return;
 436                 }
 437
 438                 Download download = downloads.get(dccSendReceived.filename());
 439                 if (download == null) {
 440                         /* unknown download, ignore. */
 441                         return;
 442                 }
 443
 444                 /* check if the file already exists. */
 445                 File outputFile = new File(temporaryDirectory, dccSendReceived.filename());
 446                 if (outputFile.exists()) {
 447                         long existingFileSize = outputFile.length();
 448
 449                         /* file already complete? */
 450                         if ((dccSendReceived.filesize() > -1) && (existingFileSize >= dccSendReceived.filesize())) {
 451                                 /* file is apparently already complete. just move it. */
 452                                 if (outputFile.renameTo(new File(finalDirectory, download.pack().name()))) {
 453                                         eventBus.post(new GenericMessage(String.format("File %s already downloaded.", download.pack().name())));
 454                                 } else {
 455                                         eventBus.post(new GenericMessage(String.format("File %s already downloaded but not moved to %s.", download.pack().name(), finalDirectory)));
 456                                 }
 457
 458                                 /* remove download. */
 459                                 downloads.remove(download);
 460                                 return;
 461                         }
 462
 463                         /* file not complete yet, DCC resume it. */
 464                         try {
 465                                 download.remoteAddress(dccSendReceived.inetAddress()).filesize(dccSendReceived.filesize());
 466                                 dccSendReceived.connection().sendDccResume(dccSendReceived.source().nick().get(), dccSendReceived.filename(), dccSendReceived.port(), existingFileSize);
 467                         } catch (IOException ioe1) {
 468                                 eventBus.post(new GenericError(String.format("Could not send DCC RESUME %s to %s (%s).", dccSendReceived.filename(), dccSendReceived.source().nick().get(), ioe1.getMessage())));
 469                         }
 470
 471                         return;
 472                 }
 473
 474                 /* file does not exist, start the download. */
 475                 try {
 476                         OutputStream fileOutputStream = new FileOutputStream(outputFile);
 477                         DccReceiver dccReceiver = new DccReceiver(eventBus, dccSendReceived.inetAddress(), dccSendReceived.port(), dccSendReceived.filename(), dccSendReceived.filesize(), fileOutputStream);
 478                         download.filename(outputFile.getPath()).outputStream(fileOutputStream).dccReceiver(dccReceiver);
 479                         dccReceivers.add(dccReceiver);
 480                         dccReceiver.start();
 481                         eventBus.post(new DownloadStarted(download));
 482                 } catch (FileNotFoundException fnfe1) {
 483                         eventBus.post(new GenericError(String.format("Could not start download of %s from %s (%s).", dccSendReceived.filename(), dccSendReceived.source().nick().get(), fnfe1.getMessage())));
 484                 }
 485         }
 486
 487         @Subscribe
 488         public void dccAcceptReceived(DccAcceptReceived dccAcceptReceived) {
 489                 Optional<Network> network = getNetwork(dccAcceptReceived.connection());
 490                 if (!network.isPresent()) {
 491                         return;
 492                 }
 493
 494                 Download download = downloads.get(dccAcceptReceived.filename());
 495                 if (download == null) {
 496                         /* unknown download, ignore. */
 497                         return;
 498                 }
 499
 500                 try {
 501                         File outputFile = new File(temporaryDirectory, dccAcceptReceived.filename());
 502                         if (outputFile.length() != dccAcceptReceived.position()) {
 503                                 eventBus.post(new GenericError(String.format("Download %s from %s does not start at the right position!")));
 504                                 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()));
 505
 506                                 downloads.remove(download);
 507                                 return;
 508                         }
 509                         OutputStream outputStream = new FileOutputStream(outputFile, true);
 510                         DccReceiver dccReceiver = new DccReceiver(eventBus, download.remoteAddress(), dccAcceptReceived.port(), dccAcceptReceived.filename(), dccAcceptReceived.position(), download.filesize(), outputStream);
 511                         download.filename(outputFile.getPath()).outputStream(outputStream).dccReceiver(dccReceiver);
 512                         dccReceivers.add(dccReceiver);
 513                         dccReceiver.start();
 514                         eventBus.post(new DownloadStarted(download));
 515                 } catch (FileNotFoundException fnfe1) {
 516                 }
 517         }
 518
 519         /**
 520          * Closes the output stream of the download and moves the file to the final
 521          * location.
 522          *
 523          * @param dccDownloadFinished
 524          *              The DCC download finished event
 525          */
 526         @Subscribe
 527         public void dccDownloadFinished(DccDownloadFinished dccDownloadFinished) {
 528                 Download download = downloads.get(dccDownloadFinished.dccReceiver().filename());
 529                 if (download == null) {
 530                         /* probably shouldn’t happen. */
 531                         return;
 532                 }
 533
 534                 try {
 535                         download.outputStream().close();
 536                         File file = new File(download.filename());
 537                         file.renameTo(new File(finalDirectory, download.pack().name()));
 538                         eventBus.post(new DownloadFinished(download));
 539                         dccReceivers.remove(dccDownloadFinished.dccReceiver());
 540                         downloads.remove(download);
 541                 } catch (IOException ioe1) {
 542                         /* TODO - handle all the errors. */
 543                         logger.log(Level.WARNING, String.format("Could not move file %s to directory %s.", download.filename(), finalDirectory), ioe1);
 544                 }
 545         }
 546
 547         /**
 548          * Closes the output stream and notifies all listeners of the failure.
 549          *
 550          * @param dccDownloadFailed
 551          *              The DCC download failed event
 552          */
 553         @Subscribe
 554         public void dccDownloadFailed(DccDownloadFailed dccDownloadFailed) {
 555                 Download download = downloads.get(dccDownloadFailed.dccReceiver().filename());
 556                 if (download == null) {
 557                         /* probably shouldn’t happen. */
 558                         return;
 559                 }
 560
 561                 try {
 562                         Closeables.close(download.outputStream(), true);
 563                         eventBus.post(new DownloadFailed(download));
 564                         dccReceivers.remove(dccDownloadFailed.dccReceiver());
 565                         downloads.remove(download);
 566                 } catch (IOException ioe1) {
 567                         /* swallow silently. */
 568                 }
 569         }
 570
 571         //
 572         // PRIVATE METHODS
 573         //
 574
 575         /**
 576          * Searches all current connections for the given connection, returning the
 577          * associated network.
 578          *
 579          * @param connection
 580          *              The connection to get the network for
 581          * @return The network belonging to the connection, or {@link
 582          *         Optional#absent()}
 583          */
 584         private Optional<Network> getNetwork(Connection connection) {
 585                 for (Entry<Network, Connection> networkConnectionEntry : networkConnections.entrySet()) {
 586                         if (networkConnectionEntry.getValue().equals(connection)) {
 587                                 return Optional.of(networkConnectionEntry.getKey());
 588                         }
 589                 }
 590                 return Optional.absent();
 591         }
 592
 593         /**
 594          * Returns the configured channel for the given network and name.
 595          *
 596          * @param network
 597          *              The network the channel is located on
 598          * @param channelName
 599          *              The name of the channel
 600          * @return The configured channel, or {@link Optional#absent()} if no
 601          *         configured channel matching the given network and name was found
 602          */
 603         public Optional<Channel> getChannel(Network network, String channelName) {
 604                 for (Channel channel : channels) {
 605                         if (channel.network().equals(network) && (channel.name().equalsIgnoreCase(channelName))) {
 606                                 return Optional.of(channel);
 607                         }
 608                 }
 609                 return Optional.absent();
 610         }
 611
 612         /**
 613          * Returns the extra channel for the given network and name.
 614          *
 615          * @param network
 616          *              The network the channel is located on
 617          * @param channelName
 618          *              The name of the channel
 619          * @return The extra channel, or {@link Optional#absent()} if no extra channel
 620          *         matching the given network and name was found
 621          */
 622         public Optional<Channel> getExtraChannel(Network network, String channelName) {
 623                 for (Channel channel : extraChannels) {
 624                         if (channel.network().equals(network) && (channel.name().equalsIgnoreCase(channelName))) {
 625                                 return Optional.of(channel);
 626                         }
 627                 }
 628                 return Optional.absent();
 629         }
 630
 631         /**
 632          * Parses {@link Pack} information from the given message.
 633          *
 634          * @param message
 635          *              The message to parse pack information from
 636          * @return The parsed pack, or {@link Optional#absent()} if the message could
 637          *         not be parsed into a pack
 638          */
 639         private Optional<Pack> parsePack(String message) {
 640                 int squareOpen = message.indexOf('[');
 641                 int squareClose = message.indexOf(']', squareOpen);
 642                 if ((squareOpen == -1) && (squareClose == -1)) {
 643                         return Optional.absent();
 644                 }
 645                 String packSize = message.substring(squareOpen + 1, squareClose);
 646                 String packName = message.substring(message.lastIndexOf(' ') + 1);
 647                 String packIndex = message.substring(0, message.indexOf(' ')).substring(1);
 648                 return Optional.of(new Pack(packIndex, packSize, packName));
 649         }
 650
 651 }