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.PrivateNoticeReceived;
  50 import net.pterodactylus.irc.event.PrivateMessageReceived;
  51 import net.pterodactylus.irc.util.MessageCleaner;
  52 import net.pterodactylus.irc.util.RandomNickname;
  53 import net.pterodactylus.xdcc.core.event.BotAdded;
  54 import net.pterodactylus.xdcc.core.event.CoreStarted;
  55 import net.pterodactylus.xdcc.core.event.DownloadFailed;
  56 import net.pterodactylus.xdcc.core.event.DownloadFinished;
  57 import net.pterodactylus.xdcc.core.event.DownloadStarted;
  58 import net.pterodactylus.xdcc.core.event.GenericError;
  59 import net.pterodactylus.xdcc.core.event.GenericMessage;
  60 import net.pterodactylus.xdcc.core.event.MessageReceived;
  61 import net.pterodactylus.xdcc.data.Bot;
  62 import net.pterodactylus.xdcc.data.Channel;
  63 import net.pterodactylus.xdcc.data.Download;
  64 import net.pterodactylus.xdcc.data.Network;
  65 import net.pterodactylus.xdcc.data.Pack;
  66 import net.pterodactylus.xdcc.data.Server;
  67
  68 import com.google.common.base.Optional;
  69 import com.google.common.collect.HashBasedTable;
  70 import com.google.common.collect.ImmutableList;
  71 import com.google.common.collect.ImmutableSet;
  72 import com.google.common.collect.Lists;
  73 import com.google.common.collect.Maps;
  74 import com.google.common.collect.Sets;
  75 import com.google.common.collect.Table;
  76 import com.google.common.eventbus.EventBus;
  77 import com.google.common.eventbus.Subscribe;
  78 import com.google.common.io.Closeables;
  79 import com.google.common.util.concurrent.AbstractExecutionThreadService;
  80 import com.google.inject.Inject;
  81
  82 /**
  83  * The core of XDCC Downloader.
  84  *
  85  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  86  */
  87 public class Core extends AbstractExecutionThreadService {
  88
  89         /** The logger. */
  90         private static final Logger logger = Logger.getLogger(Core.class.getName());
  91
  92         /** The event bus. */
  93         private final EventBus eventBus;
  94
  95         /** The temporary directory to download files to. */
  96         private final String temporaryDirectory;
  97
  98         /** The directory to move finished downloads to. */
  99         private final String finalDirectory;
 100
 101         /** The channels that should be monitored. */
 102         private final Collection<Channel> channels = Sets.newHashSet();
 103
 104         /** The channels that are currentlymonitored. */
 105         private final Collection<Channel> joinedChannels = Sets.newHashSet();
 106
 107         /** The channels that are joined but not configured. */
 108         private final Collection<Channel> extraChannels = Sets.newHashSet();
 109
 110         /** The current network connections. */
 111         private final Map<Network, Connection> networkConnections = Collections.synchronizedMap(Maps.<Network, Connection>newHashMap());
 112
 113         /** The currently known bots. */
 114         private final Table<Network, String, Bot> networkBots = HashBasedTable.create();
 115
 116         /** The current downloads. */
 117         private final Map<String, Download> downloads = Maps.newHashMap();
 118
 119         /** The current DCC receivers. */
 120         private final Collection<DccReceiver> dccReceivers = Lists.newArrayList();
 121
 122         /**
 123          * Creates a new core.
 124          *
 125          * @param eventBus
 126          *              The event bus
 127          * @param temporaryDirectory
 128          *              The directory to download files to
 129          * @param finalDirectory
 130          *              The directory to move finished files to
 131          */
 132         @Inject
 133         public Core(EventBus eventBus, String temporaryDirectory, String finalDirectory) {
 134                 this.eventBus = eventBus;
 135                 this.temporaryDirectory = temporaryDirectory;
 136                 this.finalDirectory = finalDirectory;
 137         }
 138
 139         //
 140         // ACCESSORS
 141         //
 142
 143         /**
 144          * Returns all configured channels. Due to various circumstances, configured
 145          * channels might not actually be joined.
 146          *
 147          * @return All configured channels
 148          */
 149         public Collection<Channel> channels() {
 150                 return ImmutableSet.copyOf(channels);
 151         }
 152
 153         /**
 154          * Returns all currently joined channels.
 155          *
 156          * @return All currently joined channels
 157          */
 158         public Collection<Channel> joinedChannels() {
 159                 return ImmutableSet.copyOf(joinedChannels);
 160         }
 161
 162         /**
 163          * Returns all currently joined channels that are not configured.
 164          *
 165          * @return All currently joined but not configured channels
 166          */
 167         public Collection<Channel> extraChannels() {
 168                 return ImmutableSet.copyOf(extraChannels);
 169         }
 170
 171         /**
 172          * Returns all currently known bots.
 173          *
 174          * @return All currently known bots
 175          */
 176         public Collection<Bot> bots() {
 177                 return networkBots.values();
 178         }
 179
 180         /**
 181          * Returns all currently running downloads.
 182          *
 183          * @return All currently running downloads
 184          */
 185         public Collection<Download> downloads() {
 186                 return downloads.values();
 187         }
 188
 189         //
 190         // ACTIONS
 191         //
 192
 193         /**
 194          * Adds a channel to monitor.
 195          *
 196          * @param channel
 197          *              The channel to monitor
 198          */
 199         public void addChannel(Channel channel) {
 200                 channels.add(channel);
 201         }
 202
 203         /**
 204          * Fetches the given pack from the given bot.
 205          *
 206          * @param bot
 207          *              The bot to fetch the pack from
 208          * @param pack
 209          *              The pack to fetch
 210          */
 211         public void fetch(Bot bot, Pack pack) {
 212                 Connection connection = networkConnections.get(bot.network());
 213                 if (connection == null) {
 214                         return;
 215                 }
 216
 217                 Download download = new Download(bot, pack);
 218                 downloads.put(pack.name(), download);
 219
 220                 try {
 221                         connection.sendMessage(bot.name(), "XDCC SEND " + pack.id());
 222                 } catch (IOException ioe1) {
 223                         logger.log(Level.WARNING, "Could not send message to bot!", ioe1);
 224                 }
 225         }
 226
 227         //
 228         // ABSTRACTIDLESERVICE METHODS
 229         //
 230
 231         @Override
 232         protected void startUp() {
 233                 for (Channel channel : channels) {
 234                         logger.info(String.format("Connecting to Channel %s on Network %s…", channel.name(), channel.network().name()));
 235                         connectNetwork(channel.network());
 236                 }
 237
 238                 /* notify listeners. */
 239                 eventBus.post(new CoreStarted(this));
 240         }
 241
 242         @Override
 243         protected void run() throws Exception {
 244                 while (isRunning()) {
 245                         try {
 246                                 Thread.sleep(TimeUnit.MINUTES.toMillis(1));
 247                         } catch (InterruptedException ie1) {
 248                                 /* ignore. */
 249                         }
 250
 251                         /* find channels that should be monitored but are not. */
 252                         for (Channel channel : channels) {
 253                                 if (joinedChannels.contains(channel)) {
 254                                         continue;
 255                                 }
 256
 257                                 connectNetwork(channel.network());
 258                                 Connection connection = networkConnections.get(channel.network());
 259                                 if (connection.established()) {
 260                                         eventBus.post(new GenericMessage(String.format("Trying to join %s on %s.", channel.name(), channel.network().name())));
 261                                         connection.joinChannel(channel.name());
 262                                 }
 263                         }
 264                 }
 265         }
 266
 267         @Override
 268         protected void shutDown() {
 269         }
 270
 271         //
 272         // PRIVATE METHODS
 273         //
 274
 275         /**
 276          * Starts a new connection for the given network if no such connection exists
 277          * already.
 278          *
 279          * @param network
 280          *              The network to connect to
 281          */
 282         private void connectNetwork(Network network) {
 283                 if (!networkConnections.containsKey(network)) {
 284                                 /* select a random server. */
 285                         List<Server> servers = Lists.newArrayList(network.servers());
 286                         if (servers.isEmpty()) {
 287                                 eventBus.post(new GenericError(String.format("Network %s does not have any servers.", network.name())));
 288                                 return;
 289                         }
 290                         Server server = servers.get((int) (Math.random() * servers.size()));
 291                         Connection connection = new ConnectionBuilder(eventBus).connect(server.hostname()).port(server.unencryptedPorts().iterator().next()).build();
 292                         connection.username(RandomNickname.get()).realName(RandomNickname.get());
 293                         networkConnections.put(network, connection);
 294                         connection.start();
 295                 }
 296         }
 297
 298         //
 299         // EVENT HANDLERS
 300         //
 301
 302         /**
 303          * If a connection to a network has been established, the channels associated
 304          * with this network are joined.
 305          *
 306          * @param connectionEstablished
 307          *              The connection established event
 308          */
 309         @Subscribe
 310         public void connectionEstablished(ConnectionEstablished connectionEstablished) {
 311
 312                 /* get network for connection. */
 313                 Optional<Network> network = getNetwork(connectionEstablished.connection());
 314
 315                 /* found network? */
 316                 if (!network.isPresent()) {
 317                         return;
 318                 }
 319
 320                 /* join all channels on this network. */
 321                 for (Channel channel : channels) {
 322                         if (channel.network().equals(network.get())) {
 323                                 try {
 324                                         connectionEstablished.connection().joinChannel(channel.name());
 325                                 } catch (IOException ioe1) {
 326                                         logger.log(Level.WARNING, String.format("Could not join %s on %s!", channel.name(), network.get().name()), ioe1);
 327                                 }
 328                         }
 329                 }
 330         }
 331
 332         /**
 333          * Remove all data stored for a network if the connection is closed.
 334          *
 335          * @param connectionClosed
 336          *              The connection closed event
 337          */
 338         @Subscribe
 339         public void connectionClosed(ConnectionClosed connectionClosed) {
 340                 Optional<Network> network = getNetwork(connectionClosed.connection());
 341                 if (!network.isPresent()) {
 342                         return;
 343                 }
 344
 345                 /* find all channels that need to be removed. */
 346                 for (Collection channels : ImmutableList.of(joinedChannels, extraChannels)) {
 347                         for (Iterator<Channel> channelIterator = channels.iterator(); channelIterator.hasNext(); ) {
 348                                 Channel joinedChannel = channelIterator.next();
 349                                 if (!joinedChannel.network().equals(network.get())) {
 350                                         continue;
 351                                 }
 352
 353                                 channelIterator.remove();
 354                         }
 355                 }
 356
 357                 /* now remove all bots for that network. */
 358                 Map<String, Bot> bots = networkBots.row(network.get());
 359                 int botCount = bots.size();
 360                 int packCount = 0;
 361                 for (Bot bot : bots.values()) {
 362                         packCount += bot.packs().size();
 363                 }
 364                 bots.clear();
 365                 eventBus.post(new GenericMessage(String.format("Network %s disconnected, %d bots removed, %d packs removed.", network.get().name(), botCount, packCount)));
 366
 367                 /* now remove the network. */
 368                 networkConnections.remove(network.get());
 369         }
 370
 371         /**
 372          * Shows a message when a channel was joined by us.
 373          *
 374          * @param channelJoined
 375          *              The channel joined event
 376          */
 377         @Subscribe
 378         public void channelJoined(ChannelJoined channelJoined) {
 379                 if (channelJoined.connection().isSource(channelJoined.client())) {
 380                         Optional<Network> network = getNetwork(channelJoined.connection());
 381                         if (!network.isPresent()) {
 382                                 return;
 383                         }
 384
 385                         Optional<Channel> channel = getChannel(network.get(), channelJoined.channel());
 386                         if (!channel.isPresent()) {
 387                                 /* it’s an extra channel. */
 388                                 extraChannels.add(new Channel(network.get(), channelJoined.channel()));
 389                                 logger.info(String.format("Joined extra Channel %s on %s.", channelJoined.channel(), network.get().name()));
 390                                 return;
 391                         }
 392
 393                         joinedChannels.add(channel.get());
 394                         logger.info(String.format("Joined Channel %s on %s.", channelJoined.channel(), network.get().name()));
 395                 }
 396         }
 397
 398         /**
 399          * Removes bots that leave a channel, or channels when it’s us that’s leaving.
 400          *
 401          * @param channelLeft
 402          *              The channel left event
 403          */
 404         @Subscribe
 405         public void channelLeft(ChannelLeft channelLeft) {
 406                 Optional<Network> network = getNetwork(channelLeft.connection());
 407                 if (!network.isPresent()) {
 408                         return;
 409                 }
 410
 411                 Bot bot = networkBots.get(network.get(), channelLeft.client().nick().get());
 412                 if (bot == null) {
 413                         /* maybe it was us? */
 414                         if (channelLeft.connection().isSource(channelLeft.client())) {
 415                                 Optional<Channel> channel = getChannel(network.get(), channelLeft.channel());
 416                                 if (!channel.isPresent()) {
 417                                         /* maybe it was an extra channel? */
 418                                         channel = getExtraChannel(network.get(), channelLeft.channel());
 419                                         if (!channel.isPresent()) {
 420                                                 /* okay, whatever. */
 421                                                 return;
 422                                         }
 423
 424                                         extraChannels.remove(channel);
 425                                 } else {
 426                                         channels.remove(channel.get());
 427                                 }
 428
 429                                 eventBus.post(new GenericMessage(String.format("Left Channel %s on %s.", channel.get().name(), channel.get().network().name())));
 430                         }
 431
 432                         return;
 433                 }
 434
 435                 Bot removedBot = networkBots.remove(network.get(), channelLeft.client().nick().get());
 436                 if (removedBot != null) {
 437                         eventBus.post(new GenericMessage(String.format("Bot %s (%s) was removed, %d packs removed.", removedBot.name(), removedBot.network().name(), removedBot.packs().size())));
 438                 }
 439         }
 440
 441         /**
 442          * Removes a client (which may be a bot) from the table of known bots.
 443          *
 444          * @param clientQuit
 445          *              The client quit event
 446          */
 447         @Subscribe
 448         public void clientQuit(ClientQuit clientQuit) {
 449                 Optional<Network> network = getNetwork(clientQuit.connection());
 450                 if (!network.isPresent()) {
 451                         return;
 452                 }
 453
 454                 Bot removedBot = networkBots.remove(network.get(), clientQuit.client().nick().get());
 455                 if (removedBot != null) {
 456                         eventBus.post(new GenericMessage(String.format("Bot %s (%s) was removed, %d packs removed.", removedBot.name(), removedBot.network().name(), removedBot.packs().size())));
 457                 }
 458         }
 459
 460         /**
 461          * If the nickname of a bit changes, remove it from the old name and store it
 462          * under the new name.
 463          *
 464          * @param nicknameChanged
 465          *              The nickname changed event
 466          */
 467         @Subscribe
 468         public void nicknameChanged(NicknameChanged nicknameChanged) {
 469                 Optional<Network> network = getNetwork(nicknameChanged.connection());
 470                 if (!network.isPresent()) {
 471                         return;
 472                 }
 473
 474                 Bot bot = networkBots.remove(network.get(), nicknameChanged.client().nick().get());
 475                 if (bot == null) {
 476                         return;
 477                 }
 478
 479                 networkBots.put(network.get(), nicknameChanged.newNickname(), bot);
 480         }
 481
 482         /**
 483          * If a message on a channel is received, it is parsed for pack information
 484          * with is then added to a bot.
 485          *
 486          * @param channelMessageReceived
 487          *              The channel message received event
 488          */
 489         @Subscribe
 490         public void channelMessageReceived(ChannelMessageReceived channelMessageReceived) {
 491                 String message = MessageCleaner.getDefaultInstance().clean(channelMessageReceived.message());
 492                 if (!message.startsWith("#")) {
 493                         /* most probably not a pack announcement. */
 494                         return;
 495                 }
 496
 497                 Optional<Network> network = getNetwork(channelMessageReceived.connection());
 498                 if (!network.isPresent()) {
 499                         /* message for unknown connection? */
 500                         return;
 501                 }
 502
 503                 /* parse pack information. */
 504                 Optional<Pack> pack = parsePack(message);
 505                 if (!pack.isPresent()) {
 506                         return;
 507                 }
 508
 509                 Bot bot;
 510                 synchronized (networkBots) {
 511                         if (!networkBots.contains(network.get(), channelMessageReceived.source().nick().get())) {
 512                                 bot = new Bot(network.get()).name(channelMessageReceived.source().nick().get());
 513                                 networkBots.put(network.get(), channelMessageReceived.source().nick().get(), bot);
 514                                 eventBus.post(new BotAdded(bot));
 515                         } else {
 516                                 bot = networkBots.get(network.get(), channelMessageReceived.source().nick().get());
 517                         }
 518                 }
 519
 520                 /* add pack. */
 521                 bot.addPack(pack.get());
 522                 logger.fine(String.format("Bot %s now has %d packs.", bot, bot.packs().size()));
 523         }
 524
 525         /**
 526          * Forward all private messages to every console.
 527          *
 528          * @param privateMessageReceived
 529          *              The private message recevied event
 530          */
 531         @Subscribe
 532         public void privateMessageReceived(PrivateMessageReceived privateMessageReceived) {
 533                 eventBus.post(new MessageReceived(privateMessageReceived.source(), privateMessageReceived.message()));
 534         }
 535
 536         /**
 537          * Sends a message to all console when a notice was received.
 538          *
 539          * @param privateNoticeReceived
 540          *              The notice received event
 541          */
 542         @Subscribe
 543         public void privateNoticeReceived(PrivateNoticeReceived privateNoticeReceived) {
 544                 Optional<Network> network = getNetwork(privateNoticeReceived.connection());
 545                 if (!network.isPresent()) {
 546                         return;
 547                 }
 548
 549                 eventBus.post(new GenericMessage(String.format("Notice from %s (%s): %s", privateNoticeReceived.reply().source(), network.get(), privateNoticeReceived.text())));
 550         }
 551
 552         /**
 553          * Starts a DCC download.
 554          *
 555          * @param dccSendReceived
 556          *              The DCC SEND event
 557          */
 558         @Subscribe
 559         public void dccSendReceived(DccSendReceived dccSendReceived) {
 560                 Optional<Network> network = getNetwork(dccSendReceived.connection());
 561                 if (!network.isPresent()) {
 562                         return;
 563                 }
 564
 565                 Download download = downloads.get(dccSendReceived.filename());
 566                 if (download == null) {
 567                         /* unknown download, ignore. */
 568                         return;
 569                 }
 570
 571                 /* check if the file already exists. */
 572                 File outputFile = new File(temporaryDirectory, dccSendReceived.filename());
 573                 if (outputFile.exists()) {
 574                         long existingFileSize = outputFile.length();
 575
 576                         /* file already complete? */
 577                         if ((dccSendReceived.filesize() > -1) && (existingFileSize >= dccSendReceived.filesize())) {
 578                                 /* file is apparently already complete. just move it. */
 579                                 if (outputFile.renameTo(new File(finalDirectory, download.pack().name()))) {
 580                                         eventBus.post(new GenericMessage(String.format("File %s already downloaded.", download.pack().name())));
 581                                 } else {
 582                                         eventBus.post(new GenericMessage(String.format("File %s already downloaded but not moved to %s.", download.pack().name(), finalDirectory)));
 583                                 }
 584
 585                                 /* remove download. */
 586                                 downloads.remove(download.pack().name());
 587                                 return;
 588                         }
 589
 590                         /* file not complete yet, DCC resume it. */
 591                         try {
 592                                 download.remoteAddress(dccSendReceived.inetAddress()).filesize(dccSendReceived.filesize());
 593                                 dccSendReceived.connection().sendDccResume(dccSendReceived.source().nick().get(), dccSendReceived.filename(), dccSendReceived.port(), existingFileSize);
 594                         } catch (IOException ioe1) {
 595                                 eventBus.post(new GenericError(String.format("Could not send DCC RESUME %s to %s (%s).", dccSendReceived.filename(), dccSendReceived.source().nick().get(), ioe1.getMessage())));
 596                         }
 597
 598                         return;
 599                 }
 600
 601                 /* file does not exist, start the download. */
 602                 try {
 603                         OutputStream fileOutputStream = new FileOutputStream(outputFile);
 604                         DccReceiver dccReceiver = new DccReceiver(eventBus, dccSendReceived.inetAddress(), dccSendReceived.port(), dccSendReceived.filename(), dccSendReceived.filesize(), fileOutputStream);
 605                         download.filename(outputFile.getPath()).outputStream(fileOutputStream).dccReceiver(dccReceiver);
 606                         dccReceivers.add(dccReceiver);
 607                         dccReceiver.start();
 608                         eventBus.post(new DownloadStarted(download));
 609                 } catch (FileNotFoundException fnfe1) {
 610                         eventBus.post(new GenericError(String.format("Could not start download of %s from %s (%s).", dccSendReceived.filename(), dccSendReceived.source().nick().get(), fnfe1.getMessage())));
 611                 }
 612         }
 613
 614         @Subscribe
 615         public void dccAcceptReceived(DccAcceptReceived dccAcceptReceived) {
 616                 Optional<Network> network = getNetwork(dccAcceptReceived.connection());
 617                 if (!network.isPresent()) {
 618                         return;
 619                 }
 620
 621                 Download download = downloads.get(dccAcceptReceived.filename());
 622                 if (download == null) {
 623                         /* unknown download, ignore. */
 624                         return;
 625                 }
 626
 627                 try {
 628                         File outputFile = new File(temporaryDirectory, dccAcceptReceived.filename());
 629                         if (outputFile.length() != dccAcceptReceived.position()) {
 630                                 eventBus.post(new GenericError(String.format("Download %s from %s does not start at the right position!")));
 631                                 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()));
 632
 633                                 downloads.remove(download.pack().name());
 634                                 return;
 635                         }
 636                         OutputStream outputStream = new FileOutputStream(outputFile, true);
 637                         DccReceiver dccReceiver = new DccReceiver(eventBus, download.remoteAddress(), dccAcceptReceived.port(), dccAcceptReceived.filename(), dccAcceptReceived.position(), download.filesize(), outputStream);
 638                         download.filename(outputFile.getPath()).outputStream(outputStream).dccReceiver(dccReceiver);
 639                         dccReceivers.add(dccReceiver);
 640                         dccReceiver.start();
 641                         eventBus.post(new DownloadStarted(download));
 642                 } catch (FileNotFoundException fnfe1) {
 643                 }
 644         }
 645
 646         /**
 647          * Closes the output stream of the download and moves the file to the final
 648          * location.
 649          *
 650          * @param dccDownloadFinished
 651          *              The DCC download finished event
 652          */
 653         @Subscribe
 654         public void dccDownloadFinished(DccDownloadFinished dccDownloadFinished) {
 655                 Download download = downloads.get(dccDownloadFinished.dccReceiver().filename());
 656                 if (download == null) {
 657                         /* probably shouldn’t happen. */
 658                         return;
 659                 }
 660
 661                 try {
 662                         download.outputStream().close();
 663                         File file = new File(download.filename());
 664                         file.renameTo(new File(finalDirectory, download.pack().name()));
 665                         eventBus.post(new DownloadFinished(download));
 666                         dccReceivers.remove(dccDownloadFinished.dccReceiver());
 667                         downloads.remove(download.pack().name());
 668                 } catch (IOException ioe1) {
 669                         /* TODO - handle all the errors. */
 670                         logger.log(Level.WARNING, String.format("Could not move file %s to directory %s.", download.filename(), finalDirectory), ioe1);
 671                 }
 672         }
 673
 674         /**
 675          * Closes the output stream and notifies all listeners of the failure.
 676          *
 677          * @param dccDownloadFailed
 678          *              The DCC download failed event
 679          */
 680         @Subscribe
 681         public void dccDownloadFailed(DccDownloadFailed dccDownloadFailed) {
 682                 Download download = downloads.get(dccDownloadFailed.dccReceiver().filename());
 683                 if (download == null) {
 684                         /* probably shouldn’t happen. */
 685                         return;
 686                 }
 687
 688                 try {
 689                         Closeables.close(download.outputStream(), true);
 690                         eventBus.post(new DownloadFailed(download));
 691                         dccReceivers.remove(dccDownloadFailed.dccReceiver());
 692                         downloads.remove(download.pack().name());
 693                 } catch (IOException ioe1) {
 694                         /* swallow silently. */
 695                 }
 696         }
 697
 698         //
 699         // PRIVATE METHODS
 700         //
 701
 702         /**
 703          * Searches all current connections for the given connection, returning the
 704          * associated network.
 705          *
 706          * @param connection
 707          *              The connection to get the network for
 708          * @return The network belonging to the connection, or {@link
 709          *         Optional#absent()}
 710          */
 711         private Optional<Network> getNetwork(Connection connection) {
 712                 for (Entry<Network, Connection> networkConnectionEntry : networkConnections.entrySet()) {
 713                         if (networkConnectionEntry.getValue().equals(connection)) {
 714                                 return Optional.of(networkConnectionEntry.getKey());
 715                         }
 716                 }
 717                 return Optional.absent();
 718         }
 719
 720         /**
 721          * Returns the configured channel for the given network and name.
 722          *
 723          * @param network
 724          *              The network the channel is located on
 725          * @param channelName
 726          *              The name of the channel
 727          * @return The configured channel, or {@link Optional#absent()} if no
 728          *         configured channel matching the given network and name was found
 729          */
 730         public Optional<Channel> getChannel(Network network, String channelName) {
 731                 for (Channel channel : channels) {
 732                         if (channel.network().equals(network) && (channel.name().equalsIgnoreCase(channelName))) {
 733                                 return Optional.of(channel);
 734                         }
 735                 }
 736                 return Optional.absent();
 737         }
 738
 739         /**
 740          * Returns the extra channel for the given network and name.
 741          *
 742          * @param network
 743          *              The network the channel is located on
 744          * @param channelName
 745          *              The name of the channel
 746          * @return The extra channel, or {@link Optional#absent()} if no extra channel
 747          *         matching the given network and name was found
 748          */
 749         public Optional<Channel> getExtraChannel(Network network, String channelName) {
 750                 for (Channel channel : extraChannels) {
 751                         if (channel.network().equals(network) && (channel.name().equalsIgnoreCase(channelName))) {
 752                                 return Optional.of(channel);
 753                         }
 754                 }
 755                 return Optional.absent();
 756         }
 757
 758         /**
 759          * Parses {@link Pack} information from the given message.
 760          *
 761          * @param message
 762          *              The message to parse pack information from
 763          * @return The parsed pack, or {@link Optional#absent()} if the message could
 764          *         not be parsed into a pack
 765          */
 766         private Optional<Pack> parsePack(String message) {
 767                 int squareOpen = message.indexOf('[');
 768                 int squareClose = message.indexOf(']', squareOpen);
 769                 if ((squareOpen == -1) && (squareClose == -1)) {
 770                         return Optional.absent();
 771                 }
 772                 String packSize = message.substring(squareOpen + 1, squareClose);
 773                 String packName = message.substring(message.lastIndexOf(' ') + 1);
 774                 String packIndex = message.substring(0, message.indexOf(' ')).substring(1);
 775                 return Optional.of(new Pack(packIndex, packSize, packName));
 776         }
 777
 778 }