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 static net.pterodactylus.xdcc.data.Download.FILTER_RUNNING;
  21
  22 import java.io.File;
  23 import java.io.FileNotFoundException;
  24 import java.io.FileOutputStream;
  25 import java.io.IOException;
  26 import java.io.OutputStream;
  27 import java.util.Collection;
  28 import java.util.Collections;
  29 import java.util.Iterator;
  30 import java.util.List;
  31 import java.util.Map;
  32 import java.util.Map.Entry;
  33 import java.util.concurrent.TimeUnit;
  34 import java.util.logging.Level;
  35 import java.util.logging.Logger;
  36
  37 import net.pterodactylus.irc.Connection;
  38 import net.pterodactylus.irc.ConnectionBuilder;
  39 import net.pterodactylus.irc.DccReceiver;
  40 import net.pterodactylus.irc.event.ChannelJoined;
  41 import net.pterodactylus.irc.event.ChannelLeft;
  42 import net.pterodactylus.irc.event.ChannelMessageReceived;
  43 import net.pterodactylus.irc.event.ClientQuit;
  44 import net.pterodactylus.irc.event.ConnectionClosed;
  45 import net.pterodactylus.irc.event.ConnectionEstablished;
  46 import net.pterodactylus.irc.event.ConnectionFailed;
  47 import net.pterodactylus.irc.event.DccAcceptReceived;
  48 import net.pterodactylus.irc.event.DccDownloadFailed;
  49 import net.pterodactylus.irc.event.DccDownloadFinished;
  50 import net.pterodactylus.irc.event.DccSendReceived;
  51 import net.pterodactylus.irc.event.NicknameChanged;
  52 import net.pterodactylus.irc.event.PrivateMessageReceived;
  53 import net.pterodactylus.irc.event.PrivateNoticeReceived;
  54 import net.pterodactylus.irc.event.ReplyReceived;
  55 import net.pterodactylus.irc.util.MessageCleaner;
  56 import net.pterodactylus.irc.util.RandomNickname;
  57 import net.pterodactylus.xdcc.core.event.BotAdded;
  58 import net.pterodactylus.xdcc.core.event.CoreStarted;
  59 import net.pterodactylus.xdcc.core.event.DownloadFailed;
  60 import net.pterodactylus.xdcc.core.event.DownloadFinished;
  61 import net.pterodactylus.xdcc.core.event.DownloadStarted;
  62 import net.pterodactylus.xdcc.core.event.GenericError;
  63 import net.pterodactylus.xdcc.core.event.GenericMessage;
  64 import net.pterodactylus.xdcc.core.event.MessageReceived;
  65 import net.pterodactylus.xdcc.data.Bot;
  66 import net.pterodactylus.xdcc.data.Channel;
  67 import net.pterodactylus.xdcc.data.Download;
  68 import net.pterodactylus.xdcc.data.Network;
  69 import net.pterodactylus.xdcc.data.Pack;
  70 import net.pterodactylus.xdcc.data.Server;
  71
  72 import com.google.common.base.Optional;
  73 import com.google.common.base.Predicate;
  74 import com.google.common.collect.FluentIterable;
  75 import com.google.common.collect.HashBasedTable;
  76 import com.google.common.collect.HashMultimap;
  77 import com.google.common.collect.ImmutableList;
  78 import com.google.common.collect.ImmutableSet;
  79 import com.google.common.collect.Lists;
  80 import com.google.common.collect.Maps;
  81 import com.google.common.collect.Multimap;
  82 import com.google.common.collect.Sets;
  83 import com.google.common.collect.Table;
  84 import com.google.common.eventbus.EventBus;
  85 import com.google.common.eventbus.Subscribe;
  86 import com.google.common.io.Closeables;
  87 import com.google.common.util.concurrent.AbstractExecutionThreadService;
  88 import com.google.inject.Inject;
  89
  90 /**
  91  * The core of XDCC Downloader.
  92  *
  93  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  94  */
  95 public class Core extends AbstractExecutionThreadService {
  96
  97         /** The logger. */
  98         private static final Logger logger = Logger.getLogger(Core.class.getName());
  99
 100         /** The event bus. */
 101         private final EventBus eventBus;
 102
 103         /** The temporary directory to download files to. */
 104         private final String temporaryDirectory;
 105
 106         /** The directory to move finished downloads to. */
 107         private final String finalDirectory;
 108
 109         /** The channels that should be monitored. */
 110         private final Collection<Channel> channels = Sets.newHashSet();
 111
 112         /** The channels that are currentlymonitored. */
 113         private final Collection<Channel> joinedChannels = Sets.newHashSet();
 114
 115         /** The channels that are joined but not configured. */
 116         private final Collection<Channel> extraChannels = Sets.newHashSet();
 117
 118         /** The current network connections. */
 119         private final Map<Network, Connection> networkConnections = Collections.synchronizedMap(Maps.<Network, Connection>newHashMap());
 120
 121         /** The currently known bots. */
 122         private final Table<Network, String, Bot> networkBots = HashBasedTable.create();
 123
 124         /** The current downloads. */
 125         private final Multimap<String, Download> downloads = HashMultimap.create();
 126
 127         /** The current DCC receivers. */
 128         private final Collection<DccReceiver> dccReceivers = Lists.newArrayList();
 129
 130         /**
 131          * Creates a new core.
 132          *
 133          * @param eventBus
 134          *              The event bus
 135          * @param temporaryDirectory
 136          *              The directory to download files to
 137          * @param finalDirectory
 138          *              The directory to move finished files to
 139          */
 140         @Inject
 141         public Core(EventBus eventBus, String temporaryDirectory, String finalDirectory) {
 142                 this.eventBus = eventBus;
 143                 this.temporaryDirectory = temporaryDirectory;
 144                 this.finalDirectory = finalDirectory;
 145         }
 146
 147         //
 148         // ACCESSORS
 149         //
 150
 151         /**
 152          * Returns all currently known connections.
 153          *
 154          * @return All currently known connections
 155          */
 156         public Collection<Connection> connections() {
 157                 return networkConnections.values();
 158         }
 159
 160         /**
 161          * Returns all configured channels. Due to various circumstances, configured
 162          * channels might not actually be joined.
 163          *
 164          * @return All configured channels
 165          */
 166         public Collection<Channel> channels() {
 167                 return ImmutableSet.copyOf(channels);
 168         }
 169
 170         /**
 171          * Returns all currently joined channels.
 172          *
 173          * @return All currently joined channels
 174          */
 175         public Collection<Channel> joinedChannels() {
 176                 return ImmutableSet.copyOf(joinedChannels);
 177         }
 178
 179         /**
 180          * Returns all currently joined channels that are not configured.
 181          *
 182          * @return All currently joined but not configured channels
 183          */
 184         public Collection<Channel> extraChannels() {
 185                 return ImmutableSet.copyOf(extraChannels);
 186         }
 187
 188         /**
 189          * Returns all currently known bots.
 190          *
 191          * @return All currently known bots
 192          */
 193         public Collection<Bot> bots() {
 194                 return networkBots.values();
 195         }
 196
 197         /**
 198          * Returns all currently running downloads.
 199          *
 200          * @return All currently running downloads
 201          */
 202         public Collection<Download> downloads() {
 203                 return downloads.values();
 204         }
 205
 206         //
 207         // ACTIONS
 208         //
 209
 210         /**
 211          * Adds a channel to monitor.
 212          *
 213          * @param channel
 214          *              The channel to monitor
 215          */
 216         public void addChannel(Channel channel) {
 217                 channels.add(channel);
 218         }
 219
 220         /**
 221          * Fetches the given pack from the given bot.
 222          *
 223          * @param bot
 224          *              The bot to fetch the pack from
 225          * @param pack
 226          *              The pack to fetch
 227          */
 228         public void fetch(Bot bot, Pack pack) {
 229                 Connection connection = networkConnections.get(bot.network());
 230                 if (connection == null) {
 231                         return;
 232                 }
 233
 234                 /* check if we are already downloading the file? */
 235                 if (downloads.containsKey(pack.name())) {
 236                         Collection<Download> packDownloads = downloads.get(pack.name());
 237                         Collection<Download> runningDownloads = FluentIterable.from(packDownloads).filter(FILTER_RUNNING).toSet();
 238                         if (!runningDownloads.isEmpty()) {
 239                                 Download download = runningDownloads.iterator().next();
 240                                 eventBus.post(new GenericMessage(String.format("File %s is already downloading from %s (%s).", pack.name(), download.bot().name(), download.bot().network().name())));
 241                                 return;
 242                         }
 243                         StringBuilder bots = new StringBuilder();
 244                         for (Download download : packDownloads) {
 245                                 if (bots.length() > 0) {
 246                                         bots.append(", ");
 247                                 }
 248                                 bots.append(download.bot().name()).append(" (").append(download.bot().network().name()).append(')');
 249                         }
 250                         eventBus.post(new GenericMessage(String.format("File %s is already requested from %d bots (%s).", pack.name(), packDownloads.size(), bots.toString())));
 251                 }
 252
 253                 Download download = new Download(bot, pack);
 254                 downloads.put(pack.name(), download);
 255
 256                 try {
 257                         connection.sendMessage(bot.name(), "XDCC SEND " + pack.id());
 258                 } catch (IOException ioe1) {
 259                         logger.log(Level.WARNING, "Could not send message to bot!", ioe1);
 260                 }
 261         }
 262
 263         /**
 264          * Closes the given connection.
 265          *
 266          * @param connection
 267          *              The connection to close
 268          */
 269         public void closeConnection(Connection connection) {
 270                 try {
 271                         connection.close();
 272                 } catch (IOException ioe1) {
 273                         /* TODO */
 274                 }
 275         }
 276
 277         //
 278         // ABSTRACTIDLESERVICE METHODS
 279         //
 280
 281         @Override
 282         protected void startUp() {
 283                 for (Channel channel : channels) {
 284                         logger.info(String.format("Connecting to Channel %s on Network %s…", channel.name(), channel.network().name()));
 285                         connectNetwork(channel.network());
 286                 }
 287
 288                 /* notify listeners. */
 289                 eventBus.post(new CoreStarted(this));
 290         }
 291
 292         @Override
 293         protected void run() throws Exception {
 294                 while (isRunning()) {
 295                         try {
 296                                 Thread.sleep(TimeUnit.MINUTES.toMillis(1));
 297                         } catch (InterruptedException ie1) {
 298                                 /* ignore. */
 299                         }
 300
 301                         /* find channels that should be monitored but are not. */
 302                         for (Channel channel : channels) {
 303                                 if (joinedChannels.contains(channel)) {
 304                                         continue;
 305                                 }
 306
 307                                 connectNetwork(channel.network());
 308                                 Connection connection = networkConnections.get(channel.network());
 309                                 if (connection.established()) {
 310                                         eventBus.post(new GenericMessage(String.format("Trying to join %s on %s.", channel.name(), channel.network().name())));
 311                                         connection.joinChannel(channel.name());
 312                                 }
 313                         }
 314                 }
 315         }
 316
 317         @Override
 318         protected void shutDown() {
 319         }
 320
 321         //
 322         // PRIVATE METHODS
 323         //
 324
 325         /**
 326          * Starts a new connection for the given network if no such connection exists
 327          * already.
 328          *
 329          * @param network
 330          *              The network to connect to
 331          */
 332         private void connectNetwork(Network network) {
 333                 if (!networkConnections.containsKey(network)) {
 334                                 /* select a random server. */
 335                         List<Server> servers = Lists.newArrayList(network.servers());
 336                         if (servers.isEmpty()) {
 337                                 eventBus.post(new GenericError(String.format("Network %s does not have any servers.", network.name())));
 338                                 return;
 339                         }
 340                         Server server = servers.get((int) (Math.random() * servers.size()));
 341                         Connection connection = new ConnectionBuilder(eventBus).connect(server.hostname()).port(server.unencryptedPorts().iterator().next()).build();
 342                         connection.username(RandomNickname.get()).realName(RandomNickname.get());
 343                         networkConnections.put(network, connection);
 344                         connection.start();
 345                 }
 346         }
 347
 348         /**
 349          * Removes the given connection and all its channels and bots.
 350          *
 351          * @param connection
 352          *              The connection to remove
 353          */
 354         private void removeConnection(Connection connection) {
 355                 Optional<Network> network = getNetwork(connection);
 356                 if (!network.isPresent()) {
 357                         return;
 358                 }
 359
 360                 /* find all channels that need to be removed. */
 361                 for (Collection<Channel> channels : ImmutableList.of(joinedChannels, extraChannels)) {
 362                         for (Iterator<Channel> channelIterator = channels.iterator(); channelIterator.hasNext(); ) {
 363                                 Channel joinedChannel = channelIterator.next();
 364                                 if (!joinedChannel.network().equals(network.get())) {
 365                                         continue;
 366                                 }
 367
 368                                 channelIterator.remove();
 369                         }
 370                 }
 371
 372                 /* now remove all bots for that network. */
 373                 Map<String, Bot> bots = networkBots.row(network.get());
 374                 int botCount = bots.size();
 375                 int packCount = 0;
 376                 for (Bot bot : bots.values()) {
 377                         packCount += bot.packs().size();
 378                 }
 379                 bots.clear();
 380                 eventBus.post(new GenericMessage(String.format("Network %s disconnected, %d bots removed, %d packs removed.", network.get().name(), botCount, packCount)));
 381
 382                 /* now remove the network. */
 383                 networkConnections.remove(network.get());
 384         }
 385
 386         //
 387         // EVENT HANDLERS
 388         //
 389
 390         /**
 391          * If a connection to a network has been established, the channels associated
 392          * with this network are joined.
 393          *
 394          * @param connectionEstablished
 395          *              The connection established event
 396          */
 397         @Subscribe
 398         public void connectionEstablished(ConnectionEstablished connectionEstablished) {
 399
 400                 /* get network for connection. */
 401                 Optional<Network> network = getNetwork(connectionEstablished.connection());
 402
 403                 /* found network? */
 404                 if (!network.isPresent()) {
 405                         return;
 406                 }
 407
 408                 /* join all channels on this network. */
 409                 for (Channel channel : channels) {
 410                         if (channel.network().equals(network.get())) {
 411                                 try {
 412                                         connectionEstablished.connection().joinChannel(channel.name());
 413                                 } catch (IOException ioe1) {
 414                                         logger.log(Level.WARNING, String.format("Could not join %s on %s!", channel.name(), network.get().name()), ioe1);
 415                                 }
 416                         }
 417                 }
 418         }
 419
 420         /**
 421          * Remove all data stored for a network if the connection is closed.
 422          *
 423          * @param connectionClosed
 424          *              The connection closed event
 425          */
 426         @Subscribe
 427         public void connectionClosed(ConnectionClosed connectionClosed) {
 428                 removeConnection(connectionClosed.connection());
 429         }
 430
 431         /**
 432          * Remove all data stored for a network if the connection fails.
 433          *
 434          * @param connectionFailed
 435          *              The connection failed event
 436          */
 437         public void connectionFailed(ConnectionFailed connectionFailed) {
 438                 removeConnection(connectionFailed.connection());
 439         }
 440
 441         /**
 442          * Shows a message when a channel was joined by us.
 443          *
 444          * @param channelJoined
 445          *              The channel joined event
 446          */
 447         @Subscribe
 448         public void channelJoined(ChannelJoined channelJoined) {
 449                 if (channelJoined.connection().isSource(channelJoined.client())) {
 450                         Optional<Network> network = getNetwork(channelJoined.connection());
 451                         if (!network.isPresent()) {
 452                                 return;
 453                         }
 454
 455                         Optional<Channel> channel = getChannel(network.get(), channelJoined.channel());
 456                         if (!channel.isPresent()) {
 457                                 /* it’s an extra channel. */
 458                                 extraChannels.add(new Channel(network.get(), channelJoined.channel()));
 459                                 logger.info(String.format("Joined extra Channel %s on %s.", channelJoined.channel(), network.get().name()));
 460                                 return;
 461                         }
 462
 463                         joinedChannels.add(channel.get());
 464                         logger.info(String.format("Joined Channel %s on %s.", channelJoined.channel(), network.get().name()));
 465                 }
 466         }
 467
 468         /**
 469          * Removes bots that leave a channel, or channels when it’s us that’s leaving.
 470          *
 471          * @param channelLeft
 472          *              The channel left event
 473          */
 474         @Subscribe
 475         public void channelLeft(ChannelLeft channelLeft) {
 476                 Optional<Network> network = getNetwork(channelLeft.connection());
 477                 if (!network.isPresent()) {
 478                         return;
 479                 }
 480
 481                 Bot bot = networkBots.get(network.get(), channelLeft.client().nick().get());
 482                 if (bot == null) {
 483                         /* maybe it was us? */
 484                         if (channelLeft.connection().isSource(channelLeft.client())) {
 485                                 Optional<Channel> channel = getChannel(network.get(), channelLeft.channel());
 486                                 if (!channel.isPresent()) {
 487                                         /* maybe it was an extra channel? */
 488                                         channel = getExtraChannel(network.get(), channelLeft.channel());
 489                                         if (!channel.isPresent()) {
 490                                                 /* okay, whatever. */
 491                                                 return;
 492                                         }
 493
 494                                         extraChannels.remove(channel);
 495                                 } else {
 496                                         channels.remove(channel.get());
 497                                 }
 498
 499                                 eventBus.post(new GenericMessage(String.format("Left Channel %s on %s.", channel.get().name(), channel.get().network().name())));
 500                         }
 501
 502                         return;
 503                 }
 504
 505                 Bot removedBot = networkBots.remove(network.get(), channelLeft.client().nick().get());
 506                 if (removedBot != null) {
 507                         eventBus.post(new GenericMessage(String.format("Bot %s (%s) was removed, %d packs removed.", removedBot.name(), removedBot.network().name(), removedBot.packs().size())));
 508                 }
 509         }
 510
 511         /**
 512          * Removes a client (which may be a bot) from the table of known bots.
 513          *
 514          * @param clientQuit
 515          *              The client quit event
 516          */
 517         @Subscribe
 518         public void clientQuit(ClientQuit clientQuit) {
 519                 Optional<Network> network = getNetwork(clientQuit.connection());
 520                 if (!network.isPresent()) {
 521                         return;
 522                 }
 523
 524                 Bot removedBot = networkBots.remove(network.get(), clientQuit.client().nick().get());
 525                 if (removedBot != null) {
 526                         eventBus.post(new GenericMessage(String.format("Bot %s (%s) was removed, %d packs removed.", removedBot.name(), removedBot.network().name(), removedBot.packs().size())));
 527                 }
 528         }
 529
 530         /**
 531          * If the nickname of a bit changes, remove it from the old name and store it
 532          * under the new name.
 533          *
 534          * @param nicknameChanged
 535          *              The nickname changed event
 536          */
 537         @Subscribe
 538         public void nicknameChanged(NicknameChanged nicknameChanged) {
 539                 Optional<Network> network = getNetwork(nicknameChanged.connection());
 540                 if (!network.isPresent()) {
 541                         return;
 542                 }
 543
 544                 Bot bot = networkBots.remove(network.get(), nicknameChanged.client().nick().get());
 545                 if (bot == null) {
 546                         return;
 547                 }
 548
 549                 networkBots.put(network.get(), nicknameChanged.newNickname(), bot);
 550         }
 551
 552         /**
 553          * If a message on a channel is received, it is parsed for pack information
 554          * with is then added to a bot.
 555          *
 556          * @param channelMessageReceived
 557          *              The channel message received event
 558          */
 559         @Subscribe
 560         public void channelMessageReceived(ChannelMessageReceived channelMessageReceived) {
 561                 String message = MessageCleaner.getDefaultInstance().clean(channelMessageReceived.message());
 562                 if (!message.startsWith("#")) {
 563                         /* most probably not a pack announcement. */
 564                         return;
 565                 }
 566
 567                 Optional<Network> network = getNetwork(channelMessageReceived.connection());
 568                 if (!network.isPresent()) {
 569                         /* message for unknown connection? */
 570                         return;
 571                 }
 572
 573                 /* parse pack information. */
 574                 Optional<Pack> pack = parsePack(message);
 575                 if (!pack.isPresent()) {
 576                         return;
 577                 }
 578
 579                 Bot bot;
 580                 synchronized (networkBots) {
 581                         if (!networkBots.contains(network.get(), channelMessageReceived.source().nick().get())) {
 582                                 bot = new Bot(network.get(), channelMessageReceived.source().nick().get());
 583                                 networkBots.put(network.get(), channelMessageReceived.source().nick().get(), bot);
 584                                 eventBus.post(new BotAdded(bot));
 585                         } else {
 586                                 bot = networkBots.get(network.get(), channelMessageReceived.source().nick().get());
 587                         }
 588                 }
 589
 590                 /* add pack. */
 591                 bot.addPack(pack.get());
 592                 logger.fine(String.format("Bot %s now has %d packs.", bot, bot.packs().size()));
 593         }
 594
 595         /**
 596          * Forward all private messages to every console.
 597          *
 598          * @param privateMessageReceived
 599          *              The private message recevied event
 600          */
 601         @Subscribe
 602         public void privateMessageReceived(PrivateMessageReceived privateMessageReceived) {
 603                 eventBus.post(new MessageReceived(privateMessageReceived.source(), privateMessageReceived.message()));
 604         }
 605
 606         /**
 607          * Sends a message to all console when a notice was received.
 608          *
 609          * @param privateNoticeReceived
 610          *              The notice received event
 611          */
 612         @Subscribe
 613         public void privateNoticeReceived(PrivateNoticeReceived privateNoticeReceived) {
 614                 Optional<Network> network = getNetwork(privateNoticeReceived.connection());
 615                 if (!network.isPresent()) {
 616                         return;
 617                 }
 618
 619                 eventBus.post(new GenericMessage(String.format("Notice from %s (%s): %s", privateNoticeReceived.reply().source().get(), network.get(), privateNoticeReceived.text())));
 620         }
 621
 622         /**
 623          * Starts a DCC download.
 624          *
 625          * @param dccSendReceived
 626          *              The DCC SEND event
 627          */
 628         @Subscribe
 629         public void dccSendReceived(final DccSendReceived dccSendReceived) {
 630                 final Optional<Network> network = getNetwork(dccSendReceived.connection());
 631                 if (!network.isPresent()) {
 632                         return;
 633                 }
 634
 635                 Collection<Download> packDownloads = downloads.get(dccSendReceived.filename());
 636                 if (packDownloads.isEmpty()) {
 637                         /* unknown download, ignore. */
 638                         return;
 639                 }
 640
 641                 /* check if it’s already downloading. */
 642                 Collection<Download> runningDownloads = FluentIterable.from(packDownloads).filter(FILTER_RUNNING).toSet();
 643                 if (!runningDownloads.isEmpty()) {
 644                         eventBus.post(new GenericMessage(String.format("Ignoring offer for %s, it’s already being downloaded.", dccSendReceived.filename())));
 645                         return;
 646                 }
 647
 648                 /* locate the correct download. */
 649                 Collection<Download> requestedDownload = FluentIterable.from(packDownloads).filter(new Predicate<Download>() {
 650
 651                         @Override
 652                         public boolean apply(Download download) {
 653                                 return download.bot().network().equals(network.get()) && download.bot().name().equalsIgnoreCase(dccSendReceived.source().nick().get());
 654                         }
 655                 }).toSet();
 656
 657                 /* we did not request this download. */
 658                 if (requestedDownload.isEmpty()) {
 659                         return;
 660                 }
 661
 662                 Download download = requestedDownload.iterator().next();
 663
 664                 /* check if the file already exists. */
 665                 File outputFile = new File(temporaryDirectory, dccSendReceived.filename());
 666                 if (outputFile.exists()) {
 667                         long existingFileSize = outputFile.length();
 668
 669                         /* file already complete? */
 670                         if ((dccSendReceived.filesize() > -1) && (existingFileSize >= dccSendReceived.filesize())) {
 671                                 /* file is apparently already complete. just move it. */
 672                                 if (outputFile.renameTo(new File(finalDirectory, download.pack().name()))) {
 673                                         eventBus.post(new GenericMessage(String.format("File %s already downloaded.", download.pack().name())));
 674                                 } else {
 675                                         eventBus.post(new GenericMessage(String.format("File %s already downloaded but not moved to %s.", download.pack().name(), finalDirectory)));
 676                                 }
 677
 678                                 /* remove download. */
 679                                 downloads.removeAll(download.pack().name());
 680                                 return;
 681                         }
 682
 683                         /* file not complete yet, DCC resume it. */
 684                         try {
 685                                 download.remoteAddress(dccSendReceived.inetAddress()).filesize(dccSendReceived.filesize());
 686                                 dccSendReceived.connection().sendDccResume(dccSendReceived.source().nick().get(), dccSendReceived.filename(), dccSendReceived.port(), existingFileSize);
 687                         } catch (IOException ioe1) {
 688                                 eventBus.post(new GenericError(String.format("Could not send DCC RESUME %s to %s (%s).", dccSendReceived.filename(), dccSendReceived.source().nick().get(), ioe1.getMessage())));
 689                         }
 690
 691                         return;
 692                 }
 693
 694                 /* file does not exist, start the download. */
 695                 try {
 696                         OutputStream fileOutputStream = new FileOutputStream(outputFile);
 697                         DccReceiver dccReceiver = new DccReceiver(eventBus, dccSendReceived.inetAddress(), dccSendReceived.port(), dccSendReceived.filename(), dccSendReceived.filesize(), fileOutputStream);
 698                         download.filename(outputFile.getPath()).outputStream(fileOutputStream).dccReceiver(dccReceiver);
 699                         dccReceivers.add(dccReceiver);
 700                         dccReceiver.start();
 701                         eventBus.post(new DownloadStarted(download));
 702                 } catch (FileNotFoundException fnfe1) {
 703                         eventBus.post(new GenericError(String.format("Could not start download of %s from %s (%s).", dccSendReceived.filename(), dccSendReceived.source().nick().get(), fnfe1.getMessage())));
 704                 }
 705         }
 706
 707         @Subscribe
 708         public void dccAcceptReceived(final DccAcceptReceived dccAcceptReceived) {
 709                 final Optional<Network> network = getNetwork(dccAcceptReceived.connection());
 710                 if (!network.isPresent()) {
 711                         return;
 712                 }
 713
 714                 Collection<Download> packDownloads = downloads.get(dccAcceptReceived.filename());
 715                 if (packDownloads.isEmpty()) {
 716                         /* unknown download, ignore. */
 717                         return;
 718                 }
 719
 720                 /* check if it’s already downloading. */
 721                 Collection<Download> runningDownloads = FluentIterable.from(packDownloads).filter(FILTER_RUNNING).toSet();
 722                 if (!runningDownloads.isEmpty()) {
 723                         eventBus.post(new GenericMessage(String.format("Ignoring offer for %s, it’s already being downloaded.", dccAcceptReceived.filename())));
 724                         return;
 725                 }
 726
 727                 /* locate the correct download. */
 728                 Collection<Download> requestedDownload = FluentIterable.from(packDownloads).filter(new Predicate<Download>() {
 729
 730                         @Override
 731                         public boolean apply(Download download) {
 732                                 return download.bot().network().equals(network.get()) && download.bot().name().equalsIgnoreCase(dccAcceptReceived.source().nick().get());
 733                         }
 734                 }).toSet();
 735
 736                 /* we did not request this download. */
 737                 if (requestedDownload.isEmpty()) {
 738                         return;
 739                 }
 740
 741                 Download download = requestedDownload.iterator().next();
 742
 743                 try {
 744                         File outputFile = new File(temporaryDirectory, dccAcceptReceived.filename());
 745                         if (outputFile.length() != dccAcceptReceived.position()) {
 746                                 eventBus.post(new GenericError(String.format("Download %s from %s does not start at the right position!")));
 747                                 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()));
 748
 749                                 downloads.removeAll(download.pack().name());
 750                                 return;
 751                         }
 752                         OutputStream outputStream = new FileOutputStream(outputFile, true);
 753                         DccReceiver dccReceiver = new DccReceiver(eventBus, download.remoteAddress(), dccAcceptReceived.port(), dccAcceptReceived.filename(), dccAcceptReceived.position(), download.filesize(), outputStream);
 754                         download.filename(outputFile.getPath()).outputStream(outputStream).dccReceiver(dccReceiver);
 755                         dccReceivers.add(dccReceiver);
 756                         dccReceiver.start();
 757                         eventBus.post(new DownloadStarted(download));
 758                 } catch (FileNotFoundException fnfe1) {
 759                 }
 760         }
 761
 762         /**
 763          * Closes the output stream of the download and moves the file to the final
 764          * location.
 765          *
 766          * @param dccDownloadFinished
 767          *              The DCC download finished event
 768          */
 769         @Subscribe
 770         public void dccDownloadFinished(DccDownloadFinished dccDownloadFinished) {
 771
 772                 /* locate the correct download. */
 773                 Collection<Download> requestedDownload = FluentIterable.from(downloads.get(dccDownloadFinished.dccReceiver().filename())).filter(FILTER_RUNNING).toSet();
 774                 if (requestedDownload.isEmpty()) {
 775                         /* this seems wrong. */
 776                         logger.warning("Download finished but could not be located.");
 777                         return;
 778                 }
 779                 Download download = requestedDownload.iterator().next();
 780
 781                 try {
 782                         download.outputStream().close();
 783                         File file = new File(download.filename());
 784                         file.renameTo(new File(finalDirectory, download.pack().name()));
 785                         eventBus.post(new DownloadFinished(download));
 786                         dccReceivers.remove(dccDownloadFinished.dccReceiver());
 787                         downloads.removeAll(download.pack().name());
 788                 } catch (IOException ioe1) {
 789                         /* TODO - handle all the errors. */
 790                         logger.log(Level.WARNING, String.format("Could not move file %s to directory %s.", download.filename(), finalDirectory), ioe1);
 791                 }
 792         }
 793
 794         /**
 795          * Closes the output stream and notifies all listeners of the failure.
 796          *
 797          * @param dccDownloadFailed
 798          *              The DCC download failed event
 799          */
 800         @Subscribe
 801         public void dccDownloadFailed(DccDownloadFailed dccDownloadFailed) {
 802
 803                 /* locate the correct download. */
 804                 Collection<Download> requestedDownload = FluentIterable.from(downloads.get(dccDownloadFailed.dccReceiver().filename())).filter(FILTER_RUNNING).toSet();
 805                 if (requestedDownload.isEmpty()) {
 806                         /* this seems wrong. */
 807                         logger.warning("Download finished but could not be located.");
 808                         return;
 809                 }
 810                 Download download = requestedDownload.iterator().next();
 811
 812                 try {
 813                         Closeables.close(download.outputStream(), true);
 814                         eventBus.post(new DownloadFailed(download));
 815                         dccReceivers.remove(dccDownloadFailed.dccReceiver());
 816                         downloads.removeAll(download.pack().name());
 817                 } catch (IOException ioe1) {
 818                         /* swallow silently. */
 819                 }
 820         }
 821
 822         @Subscribe
 823         public void replyReceived(ReplyReceived replyReceived) {
 824                 logger.log(Level.FINEST, String.format("%s: %s", replyReceived.connection().hostname(), replyReceived.reply()));
 825         }
 826
 827         //
 828         // PRIVATE METHODS
 829         //
 830
 831         /**
 832          * Searches all current connections for the given connection, returning the
 833          * associated network.
 834          *
 835          * @param connection
 836          *              The connection to get the network for
 837          * @return The network belonging to the connection, or {@link
 838          *         Optional#absent()}
 839          */
 840         private Optional<Network> getNetwork(Connection connection) {
 841                 for (Entry<Network, Connection> networkConnectionEntry : networkConnections.entrySet()) {
 842                         if (networkConnectionEntry.getValue().equals(connection)) {
 843                                 return Optional.of(networkConnectionEntry.getKey());
 844                         }
 845                 }
 846                 return Optional.absent();
 847         }
 848
 849         /**
 850          * Returns the configured channel for the given network and name.
 851          *
 852          * @param network
 853          *              The network the channel is located on
 854          * @param channelName
 855          *              The name of the channel
 856          * @return The configured channel, or {@link Optional#absent()} if no
 857          *         configured channel matching the given network and name was found
 858          */
 859         public Optional<Channel> getChannel(Network network, String channelName) {
 860                 for (Channel channel : channels) {
 861                         if (channel.network().equals(network) && (channel.name().equalsIgnoreCase(channelName))) {
 862                                 return Optional.of(channel);
 863                         }
 864                 }
 865                 return Optional.absent();
 866         }
 867
 868         /**
 869          * Returns the extra channel for the given network and name.
 870          *
 871          * @param network
 872          *              The network the channel is located on
 873          * @param channelName
 874          *              The name of the channel
 875          * @return The extra channel, or {@link Optional#absent()} if no extra channel
 876          *         matching the given network and name was found
 877          */
 878         public Optional<Channel> getExtraChannel(Network network, String channelName) {
 879                 for (Channel channel : extraChannels) {
 880                         if (channel.network().equals(network) && (channel.name().equalsIgnoreCase(channelName))) {
 881                                 return Optional.of(channel);
 882                         }
 883                 }
 884                 return Optional.absent();
 885         }
 886
 887         /**
 888          * Parses {@link Pack} information from the given message.
 889          *
 890          * @param message
 891          *              The message to parse pack information from
 892          * @return The parsed pack, or {@link Optional#absent()} if the message could
 893          *         not be parsed into a pack
 894          */
 895         private Optional<Pack> parsePack(String message) {
 896                 int squareOpen = message.indexOf('[');
 897                 int squareClose = message.indexOf(']', squareOpen);
 898                 if ((squareOpen == -1) && (squareClose == -1)) {
 899                         return Optional.absent();
 900                 }
 901                 String packSize = message.substring(squareOpen + 1, squareClose);
 902                 String packName = message.substring(message.lastIndexOf(' ') + 1);
 903                 String packIndex = message.substring(0, message.indexOf(' ')).substring(1);
 904                 return Optional.of(new Pack(packIndex, packSize, packName));
 905         }
 906
 907 }