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