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