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.Iterator;
  28 import java.util.List;
  29 import java.util.Map;
  30 import java.util.Map.Entry;
  31 import java.util.concurrent.TimeUnit;
  32 import java.util.logging.Level;
  33 import java.util.logging.Logger;
  34
  35 import net.pterodactylus.irc.Connection;
  36 import net.pterodactylus.irc.ConnectionBuilder;
  37 import net.pterodactylus.irc.DccReceiver;
  38 import net.pterodactylus.irc.event.ChannelJoined;
  39 import net.pterodactylus.irc.event.ChannelLeft;
  40 import net.pterodactylus.irc.event.ChannelMessageReceived;
  41 import net.pterodactylus.irc.event.ClientQuit;
  42 import net.pterodactylus.irc.event.ConnectionClosed;
  43 import net.pterodactylus.irc.event.ConnectionEstablished;
  44 import net.pterodactylus.irc.event.DccAcceptReceived;
  45 import net.pterodactylus.irc.event.DccDownloadFailed;
  46 import net.pterodactylus.irc.event.DccDownloadFinished;
  47 import net.pterodactylus.irc.event.DccSendReceived;
  48 import net.pterodactylus.irc.event.NicknameChanged;
  49 import net.pterodactylus.irc.event.PrivateMessageReceived;
  50 import net.pterodactylus.irc.util.MessageCleaner;
  51 import net.pterodactylus.irc.util.RandomNickname;
  52 import net.pterodactylus.xdcc.core.event.BotAdded;
  53 import net.pterodactylus.xdcc.core.event.CoreStarted;
  54 import net.pterodactylus.xdcc.core.event.DownloadFailed;
  55 import net.pterodactylus.xdcc.core.event.DownloadFinished;
  56 import net.pterodactylus.xdcc.core.event.DownloadStarted;
  57 import net.pterodactylus.xdcc.core.event.GenericError;
  58 import net.pterodactylus.xdcc.core.event.GenericMessage;
  59 import net.pterodactylus.xdcc.core.event.MessageReceived;
  60 import net.pterodactylus.xdcc.data.Bot;
  61 import net.pterodactylus.xdcc.data.Channel;
  62 import net.pterodactylus.xdcc.data.Download;
  63 import net.pterodactylus.xdcc.data.Network;
  64 import net.pterodactylus.xdcc.data.Pack;
  65 import net.pterodactylus.xdcc.data.Server;
  66
  67 import com.google.common.base.Optional;
  68 import com.google.common.collect.HashBasedTable;
  69 import com.google.common.collect.ImmutableList;
  70 import com.google.common.collect.ImmutableSet;
  71 import com.google.common.collect.Lists;
  72 import com.google.common.collect.Maps;
  73 import com.google.common.collect.Sets;
  74 import com.google.common.collect.Table;
  75 import com.google.common.eventbus.EventBus;
  76 import com.google.common.eventbus.Subscribe;
  77 import com.google.common.io.Closeables;
  78 import com.google.common.util.concurrent.AbstractExecutionThreadService;
  79 import com.google.inject.Inject;
  80
  81 /**
  82  * The core of XDCC Downloader.
  83  *
  84  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  85  */
  86 public class Core extends AbstractExecutionThreadService {
  87
  88         /** The logger. */
  89         private static final Logger logger = Logger.getLogger(Core.class.getName());
  90
  91         /** The event bus. */
  92         private final EventBus eventBus;
  93
  94         /** The temporary directory to download files to. */
  95         private final String temporaryDirectory;
  96
  97         /** The directory to move finished downloads to. */
  98         private final String finalDirectory;
  99
 100         /** The channels that should be monitored. */
 101         private final Collection<Channel> channels = Sets.newHashSet();
 102
 103         /** The channels that are currentlymonitored. */
 104         private final Collection<Channel> joinedChannels = Sets.newHashSet();
 105
 106         /** The channels that are joined but not configured. */
 107         private final Collection<Channel> extraChannels = Sets.newHashSet();
 108
 109         /** The current network connections. */
 110         private final Map<Network, Connection> networkConnections = Collections.synchronizedMap(Maps.<Network, Connection>newHashMap());
 111
 112         /** The currently known bots. */
 113         private final Table<Network, String, Bot> networkBots = HashBasedTable.create();
 114
 115         /** The current downloads. */
 116         private final Map<String, Download> downloads = Maps.newHashMap();
 117
 118         /** The current DCC receivers. */
 119         private final Collection<DccReceiver> dccReceivers = Lists.newArrayList();
 120
 121         /**
 122          * Creates a new core.
 123          *
 124          * @param eventBus
 125          *              The event bus
 126          * @param temporaryDirectory
 127          *              The directory to download files to
 128          * @param finalDirectory
 129          *              The directory to move finished files to
 130          */
 131         @Inject
 132         public Core(EventBus eventBus, String temporaryDirectory, String finalDirectory) {
 133                 this.eventBus = eventBus;
 134                 this.temporaryDirectory = temporaryDirectory;
 135                 this.finalDirectory = finalDirectory;
 136         }
 137
 138         //
 139         // ACCESSORS
 140         //
 141
 142         /**
 143          * Returns all configured channels. Due to various circumstances, configured
 144          * channels might not actually be joined.
 145          *
 146          * @return All configured channels
 147          */
 148         public Collection<Channel> channels() {
 149                 return ImmutableSet.copyOf(channels);
 150         }
 151
 152         /**
 153          * Returns all currently joined channels.
 154          *
 155          * @return All currently joined channels
 156          */
 157         public Collection<Channel> joinedChannels() {
 158                 return ImmutableSet.copyOf(joinedChannels);
 159         }
 160
 161         /**
 162          * Returns all currently joined channels that are not configured.
 163          *
 164          * @return All currently joined but not configured channels
 165          */
 166         public Collection<Channel> extraChannels() {
 167                 return ImmutableSet.copyOf(extraChannels);
 168         }
 169
 170         /**
 171          * Returns all currently known bots.
 172          *
 173          * @return All currently known bots
 174          */
 175         public Collection<Bot> bots() {
 176                 return networkBots.values();
 177         }
 178
 179         /**
 180          * Returns the currently active DCC receivers.
 181          *
 182          * @return The currently active DCC receivers
 183          */
 184         public Collection<DccReceiver> dccReceivers() {
 185                 return dccReceivers;
 186         }
 187
 188         //
 189         // ACTIONS
 190         //
 191
 192         /**
 193          * Adds a channel to monitor.
 194          *
 195          * @param channel
 196          *              The channel to monitor
 197          */
 198         public void addChannel(Channel channel) {
 199                 channels.add(channel);
 200         }
 201
 202         /**
 203          * Fetches the given pack from the given bot.
 204          *
 205          * @param bot
 206          *              The bot to fetch the pack from
 207          * @param pack
 208          *              The pack to fetch
 209          */
 210         public void fetch(Bot bot, Pack pack) {
 211                 Connection connection = networkConnections.get(bot.network());
 212                 if (connection == null) {
 213                         return;
 214                 }
 215
 216                 Download download = new Download(bot, pack);
 217                 downloads.put(pack.name(), download);
 218
 219                 try {
 220                         connection.sendMessage(bot.name(), "XDCC SEND " + pack.id());
 221                 } catch (IOException ioe1) {
 222                         logger.log(Level.WARNING, "Could not send message to bot!", ioe1);
 223                 }
 224         }
 225
 226         //
 227         // ABSTRACTIDLESERVICE METHODS
 228         //
 229
 230         @Override
 231         protected void startUp() {
 232                 for (Channel channel : channels) {
 233                         logger.info(String.format("Connecting to Channel %s on Network %s…", channel.name(), channel.network().name()));
 234                         connectNetwork(channel.network());
 235                 }
 236
 237                 /* notify listeners. */
 238                 eventBus.post(new CoreStarted(this));
 239         }
 240
 241         @Override
 242         protected void run() throws Exception {
 243                 while (isRunning()) {
 244                         try {
 245                                 Thread.sleep(TimeUnit.MINUTES.toMillis(1));
 246                         } catch (InterruptedException ie1) {
 247                                 /* ignore. */
 248                         }
 249
 250                         /* find channels that should be monitored but are not. */
 251                         for (Channel channel : channels) {
 252                                 if (joinedChannels.contains(channel)) {
 253                                         continue;
 254                                 }
 255
 256                                 connectNetwork(channel.network());
 257                                 Connection connection = networkConnections.get(channel.network());
 258                                 if (connection.established()) {
 259                                         eventBus.post(new GenericMessage(String.format("Trying to join %s on %s.", channel.name(), channel.network().name())));
 260                                         connection.joinChannel(channel.name());
 261                                 }
 262                         }
 263                 }
 264         }
 265
 266         @Override
 267         protected void shutDown() {
 268         }
 269
 270         //
 271         // PRIVATE METHODS
 272         //
 273
 274         /**
 275          * Starts a new connection for the given network if no such connection exists
 276          * already.
 277          *
 278          * @param network
 279          *              The network to connect to
 280          */
 281         private void connectNetwork(Network network) {
 282                 if (!networkConnections.containsKey(network)) {
 283                                 /* select a random server. */
 284                         List<Server> servers = Lists.newArrayList(network.servers());
 285                         if (servers.isEmpty()) {
 286                                 eventBus.post(new GenericError(String.format("Network %s does not have any servers.", network.name())));
 287                                 return;
 288                         }
 289                         Server server = servers.get((int) (Math.random() * servers.size()));
 290                         Connection connection = new ConnectionBuilder(eventBus).connect(server.hostname()).port(server.unencryptedPorts().iterator().next()).build();
 291                         connection.username(RandomNickname.get()).realName(RandomNickname.get());
 292                         networkConnections.put(network, connection);
 293                         connection.start();
 294                 }
 295         }
 296
 297         //
 298         // EVENT HANDLERS
 299         //
 300
 301         /**
 302          * If a connection to a network has been established, the channels associated
 303          * with this network are joined.
 304          *
 305          * @param connectionEstablished
 306          *              The connection established event
 307          */
 308         @Subscribe
 309         public void connectionEstablished(ConnectionEstablished connectionEstablished) {
 310
 311                 /* get network for connection. */
 312                 Optional<Network> network = getNetwork(connectionEstablished.connection());
 313
 314                 /* found network? */
 315                 if (!network.isPresent()) {
 316                         return;
 317                 }
 318
 319                 /* join all channels on this network. */
 320                 for (Channel channel : channels) {
 321                         if (channel.network().equals(network.get())) {
 322                                 try {
 323                                         connectionEstablished.connection().joinChannel(channel.name());
 324                                 } catch (IOException ioe1) {
 325                                         logger.log(Level.WARNING, String.format("Could not join %s on %s!", channel.name(), network.get().name()), ioe1);
 326                                 }
 327                         }
 328                 }
 329         }
 330
 331         /**
 332          * Remove all data stored for a network if the connection is closed.
 333          *
 334          * @param connectionClosed
 335          *              The connection closed event
 336          */
 337         @Subscribe
 338         public void connectionClosed(ConnectionClosed connectionClosed) {
 339                 Optional<Network> network = getNetwork(connectionClosed.connection());
 340                 if (!network.isPresent()) {
 341                         return;
 342                 }
 343
 344                 /* find all channels that need to be removed. */
 345                 for (Collection channels : ImmutableList.of(joinedChannels, extraChannels)) {
 346                         for (Iterator<Channel> channelIterator = channels.iterator(); channelIterator.hasNext(); ) {
 347                                 Channel joinedChannel = channelIterator.next();
 348                                 if (!joinedChannel.network().equals(network.get())) {
 349                                         continue;
 350                                 }
 351
 352                                 channelIterator.remove();
 353                         }
 354                 }
 355
 356                 /* now remove all bots for that network. */
 357                 Map<String, Bot> bots = networkBots.row(network.get());
 358                 int botCount = bots.size();
 359                 int packCount = 0;
 360                 for (Bot bot : bots.values()) {
 361                         packCount += bot.packs().size();
 362                 }
 363                 bots.clear();
 364                 eventBus.post(new GenericMessage(String.format("Network %s disconnected, %d bots removed, %d packs removed.", network.get().name(), botCount, packCount)));
 365
 366                 /* now remove the network. */
 367                 networkConnections.remove(network.get());
 368         }
 369
 370         /**
 371          * Shows a message when a channel was joined by us.
 372          *
 373          * @param channelJoined
 374          *              The channel joined event
 375          */
 376         @Subscribe
 377         public void channelJoined(ChannelJoined channelJoined) {
 378                 if (channelJoined.connection().isSource(channelJoined.client())) {
 379                         Optional<Network> network = getNetwork(channelJoined.connection());
 380                         if (!network.isPresent()) {
 381                                 return;
 382                         }
 383
 384                         Optional<Channel> channel = getChannel(network.get(), channelJoined.channel());
 385                         if (!channel.isPresent()) {
 386                                 /* it’s an extra channel. */
 387                                 extraChannels.add(new Channel(network.get(), channelJoined.channel()));
 388                                 logger.info(String.format("Joined extra Channel %s on %s.", channelJoined.channel(), network.get().name()));
 389                                 return;
 390                         }
 391
 392                         joinedChannels.add(channel.get());
 393                         logger.info(String.format("Joined Channel %s on %s.", channelJoined.channel(), network.get().name()));
 394                 }
 395         }
 396
 397         /**
 398          * Removes bots that leave a channel, or channels when it’s us that’s leaving.
 399          *
 400          * @param channelLeft
 401          *              The channel left event
 402          */
 403         @Subscribe
 404         public void channelLeft(ChannelLeft channelLeft) {
 405                 Optional<Network> network = getNetwork(channelLeft.connection());
 406                 if (!network.isPresent()) {
 407                         return;
 408                 }
 409
 410                 Bot bot = networkBots.get(network.get(), channelLeft.client().nick().get());
 411                 if (bot == null) {
 412                         /* maybe it was us? */
 413                         if (channelLeft.connection().isSource(channelLeft.client())) {
 414                                 Optional<Channel> channel = getChannel(network.get(), channelLeft.channel());
 415                                 if (!channel.isPresent()) {
 416                                         /* maybe it was an extra channel? */
 417                                         channel = getExtraChannel(network.get(), channelLeft.channel());
 418                                         if (!channel.isPresent()) {
 419                                                 /* okay, whatever. */
 420                                                 return;
 421                                         }
 422
 423                                         extraChannels.remove(channel);
 424                                 } else {
 425                                         channels.remove(channel.get());
 426                                 }
 427
 428                                 eventBus.post(new GenericMessage(String.format("Left Channel %s on %s.", channel.get().name(), channel.get().network().name())));
 429                         }
 430
 431                         return;
 432                 }
 433
 434                 Bot removedBot = networkBots.remove(network.get(), channelLeft.client().nick().get());
 435                 if (removedBot != null) {
 436                         eventBus.post(new GenericMessage(String.format("Bot %s (%s) was removed, %d packs removed.", removedBot.name(), removedBot.network().name(), removedBot.packs().size())));
 437                 }
 438         }
 439
 440         /**
 441          * Removes a client (which may be a bot) from the table of known bots.
 442          *
 443          * @param clientQuit
 444          *              The client quit event
 445          */
 446         @Subscribe
 447         public void clientQuit(ClientQuit clientQuit) {
 448                 Optional<Network> network = getNetwork(clientQuit.connection());
 449                 if (!network.isPresent()) {
 450                         return;
 451                 }
 452
 453                 Bot removedBot = networkBots.remove(network.get(), clientQuit.client().nick().get());
 454                 if (removedBot != null) {
 455                         eventBus.post(new GenericMessage(String.format("Bot %s (%s) was removed, %d packs removed.", removedBot.name(), removedBot.network().name(), removedBot.packs().size())));
 456                 }
 457         }
 458
 459         /**
 460          * If the nickname of a bit changes, remove it from the old name and store it
 461          * under the new name.
 462          *
 463          * @param nicknameChanged
 464          *              The nickname changed event
 465          */
 466         @Subscribe
 467         public void nicknameChanged(NicknameChanged nicknameChanged) {
 468                 Optional<Network> network = getNetwork(nicknameChanged.connection());
 469                 if (!network.isPresent()) {
 470                         return;
 471                 }
 472
 473                 Bot bot = networkBots.remove(network.get(), nicknameChanged.client().nick().get());
 474                 if (bot == null) {
 475                         return;
 476                 }
 477
 478                 networkBots.put(network.get(), nicknameChanged.newNickname(), bot);
 479         }
 480
 481         /**
 482          * If a message on a channel is received, it is parsed for pack information
 483          * with is then added to a bot.
 484          *
 485          * @param channelMessageReceived
 486          *              The channel message received event
 487          */
 488         @Subscribe
 489         public void channelMessageReceived(ChannelMessageReceived channelMessageReceived) {
 490                 String message = MessageCleaner.getDefaultInstance().clean(channelMessageReceived.message());
 491                 if (!message.startsWith("#")) {
 492                         /* most probably not a pack announcement. */
 493                         return;
 494                 }
 495
 496                 Optional<Network> network = getNetwork(channelMessageReceived.connection());
 497                 if (!network.isPresent()) {
 498                         /* message for unknown connection? */
 499                         return;
 500                 }
 501
 502                 /* parse pack information. */
 503                 Optional<Pack> pack = parsePack(message);
 504                 if (!pack.isPresent()) {
 505                         return;
 506                 }
 507
 508                 Bot bot;
 509                 synchronized (networkBots) {
 510                         if (!networkBots.contains(network.get(), channelMessageReceived.source().nick().get())) {
 511                                 bot = new Bot(network.get()).name(channelMessageReceived.source().nick().get());
 512                                 networkBots.put(network.get(), channelMessageReceived.source().nick().get(), bot);
 513                                 eventBus.post(new BotAdded(bot));
 514                         } else {
 515                                 bot = networkBots.get(network.get(), channelMessageReceived.source().nick().get());
 516                         }
 517                 }
 518
 519                 /* add pack. */
 520                 bot.addPack(pack.get());
 521                 logger.fine(String.format("Bot %s now has %d packs.", bot, bot.packs().size()));
 522         }
 523
 524         /**
 525          * Forward all private messages to every console.
 526          *
 527          * @param privateMessageReceived
 528          *              The private message recevied event
 529          */
 530         @Subscribe
 531         public void privateMessageReceived(PrivateMessageReceived privateMessageReceived) {
 532                 eventBus.post(new MessageReceived(privateMessageReceived.source(), privateMessageReceived.message()));
 533         }
 534
 535         /**
 536          * Starts a DCC download.
 537          *
 538          * @param dccSendReceived
 539          *              The DCC SEND event
 540          */
 541         @Subscribe
 542         public void dccSendReceived(DccSendReceived dccSendReceived) {
 543                 Optional<Network> network = getNetwork(dccSendReceived.connection());
 544                 if (!network.isPresent()) {
 545                         return;
 546                 }
 547
 548                 Download download = downloads.get(dccSendReceived.filename());
 549                 if (download == null) {
 550                         /* unknown download, ignore. */
 551                         return;
 552                 }
 553
 554                 /* check if the file already exists. */
 555                 File outputFile = new File(temporaryDirectory, dccSendReceived.filename());
 556                 if (outputFile.exists()) {
 557                         long existingFileSize = outputFile.length();
 558
 559                         /* file already complete? */
 560                         if ((dccSendReceived.filesize() > -1) && (existingFileSize >= dccSendReceived.filesize())) {
 561                                 /* file is apparently already complete. just move it. */
 562                                 if (outputFile.renameTo(new File(finalDirectory, download.pack().name()))) {
 563                                         eventBus.post(new GenericMessage(String.format("File %s already downloaded.", download.pack().name())));
 564                                 } else {
 565                                         eventBus.post(new GenericMessage(String.format("File %s already downloaded but not moved to %s.", download.pack().name(), finalDirectory)));
 566                                 }
 567
 568                                 /* remove download. */
 569                                 downloads.remove(download);
 570                                 return;
 571                         }
 572
 573                         /* file not complete yet, DCC resume it. */
 574                         try {
 575                                 download.remoteAddress(dccSendReceived.inetAddress()).filesize(dccSendReceived.filesize());
 576                                 dccSendReceived.connection().sendDccResume(dccSendReceived.source().nick().get(), dccSendReceived.filename(), dccSendReceived.port(), existingFileSize);
 577                         } catch (IOException ioe1) {
 578                                 eventBus.post(new GenericError(String.format("Could not send DCC RESUME %s to %s (%s).", dccSendReceived.filename(), dccSendReceived.source().nick().get(), ioe1.getMessage())));
 579                         }
 580
 581                         return;
 582                 }
 583
 584                 /* file does not exist, start the download. */
 585                 try {
 586                         OutputStream fileOutputStream = new FileOutputStream(outputFile);
 587                         DccReceiver dccReceiver = new DccReceiver(eventBus, dccSendReceived.inetAddress(), dccSendReceived.port(), dccSendReceived.filename(), dccSendReceived.filesize(), fileOutputStream);
 588                         download.filename(outputFile.getPath()).outputStream(fileOutputStream).dccReceiver(dccReceiver);
 589                         dccReceivers.add(dccReceiver);
 590                         dccReceiver.start();
 591                         eventBus.post(new DownloadStarted(download));
 592                 } catch (FileNotFoundException fnfe1) {
 593                         eventBus.post(new GenericError(String.format("Could not start download of %s from %s (%s).", dccSendReceived.filename(), dccSendReceived.source().nick().get(), fnfe1.getMessage())));
 594                 }
 595         }
 596
 597         @Subscribe
 598         public void dccAcceptReceived(DccAcceptReceived dccAcceptReceived) {
 599                 Optional<Network> network = getNetwork(dccAcceptReceived.connection());
 600                 if (!network.isPresent()) {
 601                         return;
 602                 }
 603
 604                 Download download = downloads.get(dccAcceptReceived.filename());
 605                 if (download == null) {
 606                         /* unknown download, ignore. */
 607                         return;
 608                 }
 609
 610                 try {
 611                         File outputFile = new File(temporaryDirectory, dccAcceptReceived.filename());
 612                         if (outputFile.length() != dccAcceptReceived.position()) {
 613                                 eventBus.post(new GenericError(String.format("Download %s from %s does not start at the right position!")));
 614                                 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()));
 615
 616                                 downloads.remove(download);
 617                                 return;
 618                         }
 619                         OutputStream outputStream = new FileOutputStream(outputFile, true);
 620                         DccReceiver dccReceiver = new DccReceiver(eventBus, download.remoteAddress(), dccAcceptReceived.port(), dccAcceptReceived.filename(), dccAcceptReceived.position(), download.filesize(), outputStream);
 621                         download.filename(outputFile.getPath()).outputStream(outputStream).dccReceiver(dccReceiver);
 622                         dccReceivers.add(dccReceiver);
 623                         dccReceiver.start();
 624                         eventBus.post(new DownloadStarted(download));
 625                 } catch (FileNotFoundException fnfe1) {
 626                 }
 627         }
 628
 629         /**
 630          * Closes the output stream of the download and moves the file to the final
 631          * location.
 632          *
 633          * @param dccDownloadFinished
 634          *              The DCC download finished event
 635          */
 636         @Subscribe
 637         public void dccDownloadFinished(DccDownloadFinished dccDownloadFinished) {
 638                 Download download = downloads.get(dccDownloadFinished.dccReceiver().filename());
 639                 if (download == null) {
 640                         /* probably shouldn’t happen. */
 641                         return;
 642                 }
 643
 644                 try {
 645                         download.outputStream().close();
 646                         File file = new File(download.filename());
 647                         file.renameTo(new File(finalDirectory, download.pack().name()));
 648                         eventBus.post(new DownloadFinished(download));
 649                         dccReceivers.remove(dccDownloadFinished.dccReceiver());
 650                         downloads.remove(download);
 651                 } catch (IOException ioe1) {
 652                         /* TODO - handle all the errors. */
 653                         logger.log(Level.WARNING, String.format("Could not move file %s to directory %s.", download.filename(), finalDirectory), ioe1);
 654                 }
 655         }
 656
 657         /**
 658          * Closes the output stream and notifies all listeners of the failure.
 659          *
 660          * @param dccDownloadFailed
 661          *              The DCC download failed event
 662          */
 663         @Subscribe
 664         public void dccDownloadFailed(DccDownloadFailed dccDownloadFailed) {
 665                 Download download = downloads.get(dccDownloadFailed.dccReceiver().filename());
 666                 if (download == null) {
 667                         /* probably shouldn’t happen. */
 668                         return;
 669                 }
 670
 671                 try {
 672                         Closeables.close(download.outputStream(), true);
 673                         eventBus.post(new DownloadFailed(download));
 674                         dccReceivers.remove(dccDownloadFailed.dccReceiver());
 675                         downloads.remove(download);
 676                 } catch (IOException ioe1) {
 677                         /* swallow silently. */
 678                 }
 679         }
 680
 681         //
 682         // PRIVATE METHODS
 683         //
 684
 685         /**
 686          * Searches all current connections for the given connection, returning the
 687          * associated network.
 688          *
 689          * @param connection
 690          *              The connection to get the network for
 691          * @return The network belonging to the connection, or {@link
 692          *         Optional#absent()}
 693          */
 694         private Optional<Network> getNetwork(Connection connection) {
 695                 for (Entry<Network, Connection> networkConnectionEntry : networkConnections.entrySet()) {
 696                         if (networkConnectionEntry.getValue().equals(connection)) {
 697                                 return Optional.of(networkConnectionEntry.getKey());
 698                         }
 699                 }
 700                 return Optional.absent();
 701         }
 702
 703         /**
 704          * Returns the configured channel for the given network and name.
 705          *
 706          * @param network
 707          *              The network the channel is located on
 708          * @param channelName
 709          *              The name of the channel
 710          * @return The configured channel, or {@link Optional#absent()} if no
 711          *         configured channel matching the given network and name was found
 712          */
 713         public Optional<Channel> getChannel(Network network, String channelName) {
 714                 for (Channel channel : channels) {
 715                         if (channel.network().equals(network) && (channel.name().equalsIgnoreCase(channelName))) {
 716                                 return Optional.of(channel);
 717                         }
 718                 }
 719                 return Optional.absent();
 720         }
 721
 722         /**
 723          * Returns the extra channel for the given network and name.
 724          *
 725          * @param network
 726          *              The network the channel is located on
 727          * @param channelName
 728          *              The name of the channel
 729          * @return The extra channel, or {@link Optional#absent()} if no extra channel
 730          *         matching the given network and name was found
 731          */
 732         public Optional<Channel> getExtraChannel(Network network, String channelName) {
 733                 for (Channel channel : extraChannels) {
 734                         if (channel.network().equals(network) && (channel.name().equalsIgnoreCase(channelName))) {
 735                                 return Optional.of(channel);
 736                         }
 737                 }
 738                 return Optional.absent();
 739         }
 740
 741         /**
 742          * Parses {@link Pack} information from the given message.
 743          *
 744          * @param message
 745          *              The message to parse pack information from
 746          * @return The parsed pack, or {@link Optional#absent()} if the message could
 747          *         not be parsed into a pack
 748          */
 749         private Optional<Pack> parsePack(String message) {
 750                 int squareOpen = message.indexOf('[');
 751                 int squareClose = message.indexOf(']', squareOpen);
 752                 if ((squareOpen == -1) && (squareClose == -1)) {
 753                         return Optional.absent();
 754                 }
 755                 String packSize = message.substring(squareOpen + 1, squareClose);
 756                 String packName = message.substring(message.lastIndexOf(' ') + 1);
 757                 String packIndex = message.substring(0, message.indexOf(' ')).substring(1);
 758                 return Optional.of(new Pack(packIndex, packSize, packName));
 759         }
 760
 761 }