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          * Cancels the download of the given pack from the given bot.
 265          *
 266          * @param bot
 267          *              The bot the pack is being downloaded from
 268          * @param pack
 269          *              The pack being downloaded
 270          */
 271         public void cancelDownload(Bot bot, Pack pack) {
 272                 Optional<Download> download = getDownload(pack, bot);
 273                 if (!download.isPresent()) {
 274                         return;
 275                 }
 276
 277                 /* get connection. */
 278                 Connection connection = networkConnections.get(bot.network());
 279                 if (connection == null) {
 280                         /* request for unknown network? */
 281                         return;
 282                 }
 283
 284                 /* stop the DCC receiver. */
 285                 if (download.get().dccReceiver() != null) {
 286                         download.get().dccReceiver().stop();
 287                 } else {
 288                         /* remove download if it hasn’t started yet. */
 289                         downloads.remove(pack.name(), download.get());
 290                 }
 291
 292                 /* remove the request from the bot, too. */
 293                 try {
 294                         connection.sendMessage(bot.name(), String.format("XDCC %s", (download.get().dccReceiver() != null) ? "CANCEL" : "REMOVE"));
 295                 } catch (IOException ioe1) {
 296                         logger.log(Level.WARNING, String.format("Could not cancel DCC from %s (%s)!", bot.name(), bot.network().name()), ioe1);
 297                 }
 298         }
 299
 300         /**
 301          * Closes the given connection.
 302          *
 303          * @param connection
 304          *              The connection to close
 305          */
 306         public void closeConnection(Connection connection) {
 307                 try {
 308                         connection.close();
 309                 } catch (IOException ioe1) {
 310                         /* TODO */
 311                 }
 312         }
 313
 314         //
 315         // ABSTRACTIDLESERVICE METHODS
 316         //
 317
 318         @Override
 319         protected void startUp() {
 320                 for (Channel channel : channels) {
 321                         logger.info(String.format("Connecting to Channel %s on Network %s…", channel.name(), channel.network().name()));
 322                         connectNetwork(channel.network());
 323                 }
 324
 325                 /* notify listeners. */
 326                 eventBus.post(new CoreStarted(this));
 327         }
 328
 329         @Override
 330         protected void run() throws Exception {
 331                 while (isRunning()) {
 332                         try {
 333                                 Thread.sleep(TimeUnit.MINUTES.toMillis(1));
 334                         } catch (InterruptedException ie1) {
 335                                 /* ignore. */
 336                         }
 337
 338                         /* find channels that should be monitored but are not. */
 339                         for (Channel channel : channels) {
 340                                 if (joinedChannels.contains(channel)) {
 341                                         continue;
 342                                 }
 343
 344                                 connectNetwork(channel.network());
 345                                 Connection connection = networkConnections.get(channel.network());
 346                                 if (connection.established()) {
 347                                         eventBus.post(new GenericMessage(String.format("Trying to join %s on %s.", channel.name(), channel.network().name())));
 348                                         try {
 349                                                 connection.joinChannel(channel.name());
 350                                         } catch (IOException ioe1) {
 351                                                 eventBus.post(new GenericMessage(String.format("Could not join %s on %s.", channel.name(), channel.network().name())));
 352                                         }
 353                                 }
 354                         }
 355                 }
 356         }
 357
 358         @Override
 359         protected void shutDown() {
 360         }
 361
 362         //
 363         // PRIVATE METHODS
 364         //
 365
 366         /**
 367          * Starts a new connection for the given network if no such connection exists
 368          * already.
 369          *
 370          * @param network
 371          *              The network to connect to
 372          */
 373         private void connectNetwork(Network network) {
 374                 if (!networkConnections.containsKey(network)) {
 375                                 /* select a random server. */
 376                         List<Server> servers = Lists.newArrayList(network.servers());
 377                         if (servers.isEmpty()) {
 378                                 eventBus.post(new GenericError(String.format("Network %s does not have any servers.", network.name())));
 379                                 return;
 380                         }
 381                         Server server = servers.get((int) (Math.random() * servers.size()));
 382                         Connection connection = new ConnectionBuilder(eventBus).connect(server.hostname()).port(server.unencryptedPorts().iterator().next()).build();
 383                         connection.username(RandomNickname.get()).realName(RandomNickname.get());
 384                         networkConnections.put(network, connection);
 385                         connection.start();
 386                 }
 387         }
 388
 389         /**
 390          * Removes the given connection and all its channels and bots.
 391          *
 392          * @param connection
 393          *              The connection to remove
 394          */
 395         private void removeConnection(Connection connection) {
 396                 Optional<Network> network = getNetwork(connection);
 397                 if (!network.isPresent()) {
 398                         return;
 399                 }
 400
 401                 /* find all channels that need to be removed. */
 402                 for (Collection<Channel> channels : ImmutableList.of(joinedChannels, extraChannels)) {
 403                         for (Iterator<Channel> channelIterator = channels.iterator(); channelIterator.hasNext(); ) {
 404                                 Channel joinedChannel = channelIterator.next();
 405                                 if (!joinedChannel.network().equals(network.get())) {
 406                                         continue;
 407                                 }
 408
 409                                 channelIterator.remove();
 410                         }
 411                 }
 412
 413                 /* now remove all bots for that network. */
 414                 Map<String, Bot> bots = networkBots.row(network.get());
 415                 int botCount = bots.size();
 416                 int packCount = 0;
 417                 for (Bot bot : bots.values()) {
 418                         packCount += bot.packs().size();
 419                 }
 420                 bots.clear();
 421                 eventBus.post(new GenericMessage(String.format("Network %s disconnected, %d bots removed, %d packs removed.", network.get().name(), botCount, packCount)));
 422
 423                 /* now remove the network. */
 424                 networkConnections.remove(network.get());
 425         }
 426
 427         //
 428         // EVENT HANDLERS
 429         //
 430
 431         /**
 432          * If a connection to a network has been established, the channels associated
 433          * with this network are joined.
 434          *
 435          * @param connectionEstablished
 436          *              The connection established event
 437          */
 438         @Subscribe
 439         public void connectionEstablished(ConnectionEstablished connectionEstablished) {
 440
 441                 /* get network for connection. */
 442                 Optional<Network> network = getNetwork(connectionEstablished.connection());
 443
 444                 /* found network? */
 445                 if (!network.isPresent()) {
 446                         eventBus.post(new GenericMessage(String.format("Connected to unknown network: %s", connectionEstablished.connection().hostname())));
 447                         return;
 448                 }
 449
 450                 eventBus.post(new GenericMessage(String.format("Connected to network %s.", network.get().name())));
 451
 452                 /* join all channels on this network. */
 453                 for (Channel channel : channels) {
 454                         if (channel.network().equals(network.get())) {
 455                                 try {
 456                                         eventBus.post(new GenericMessage(String.format("Trying to join %s on %s...", channel.name(), network.get().name())));
 457                                         connectionEstablished.connection().joinChannel(channel.name());
 458                                 } catch (IOException ioe1) {
 459                                         logger.log(Level.WARNING, String.format("Could not join %s on %s!", channel.name(), network.get().name()), ioe1);
 460                                 }
 461                         }
 462                 }
 463         }
 464
 465         /**
 466          * Remove all data stored for a network if the connection is closed.
 467          *
 468          * @param connectionClosed
 469          *              The connection closed event
 470          */
 471         @Subscribe
 472         public void connectionClosed(ConnectionClosed connectionClosed) {
 473                 removeConnection(connectionClosed.connection());
 474         }
 475
 476         /**
 477          * Remove all data stored for a network if the connection fails.
 478          *
 479          * @param connectionFailed
 480          *              The connection failed event
 481          */
 482         public void connectionFailed(ConnectionFailed connectionFailed) {
 483                 removeConnection(connectionFailed.connection());
 484         }
 485
 486         /**
 487          * Shows a message when a channel was joined by us.
 488          *
 489          * @param channelJoined
 490          *              The channel joined event
 491          */
 492         @Subscribe
 493         public void channelJoined(ChannelJoined channelJoined) {
 494                 if (channelJoined.connection().isSource(channelJoined.client())) {
 495                         Optional<Network> network = getNetwork(channelJoined.connection());
 496                         if (!network.isPresent()) {
 497                                 return;
 498                         }
 499
 500                         Optional<Channel> channel = getChannel(network.get(), channelJoined.channel());
 501                         if (!channel.isPresent()) {
 502                                 /* it’s an extra channel. */
 503                                 extraChannels.add(new Channel(network.get(), channelJoined.channel()));
 504                                 logger.info(String.format("Joined extra Channel %s on %s.", channelJoined.channel(), network.get().name()));
 505                                 return;
 506                         }
 507
 508                         joinedChannels.add(channel.get());
 509                         logger.info(String.format("Joined Channel %s on %s.", channelJoined.channel(), network.get().name()));
 510                 }
 511         }
 512
 513         /**
 514          * Removes bots that leave a channel, or channels when it’s us that’s leaving.
 515          *
 516          * @param channelLeft
 517          *              The channel left event
 518          */
 519         @Subscribe
 520         public void channelLeft(ChannelLeft channelLeft) {
 521                 Optional<Network> network = getNetwork(channelLeft.connection());
 522                 if (!network.isPresent()) {
 523                         return;
 524                 }
 525
 526                 Bot bot = networkBots.get(network.get(), channelLeft.client().nick().get());
 527                 if (bot == null) {
 528                         /* maybe it was us? */
 529                         if (channelLeft.connection().isSource(channelLeft.client())) {
 530                                 Optional<Channel> channel = getChannel(network.get(), channelLeft.channel());
 531                                 if (!channel.isPresent()) {
 532                                         /* maybe it was an extra channel? */
 533                                         channel = getExtraChannel(network.get(), channelLeft.channel());
 534                                         if (!channel.isPresent()) {
 535                                                 /* okay, whatever. */
 536                                                 return;
 537                                         }
 538
 539                                         extraChannels.remove(channel);
 540                                 } else {
 541                                         channels.remove(channel.get());
 542                                 }
 543
 544                                 eventBus.post(new GenericMessage(String.format("Left Channel %s on %s.", channel.get().name(), channel.get().network().name())));
 545                         }
 546
 547                         return;
 548                 }
 549
 550                 networkBots.remove(network.get(), channelLeft.client().nick().get());
 551         }
 552
 553         /**
 554          * Removes a client (which may be a bot) from the table of known bots.
 555          *
 556          * @param clientQuit
 557          *              The client quit event
 558          */
 559         @Subscribe
 560         public void clientQuit(ClientQuit clientQuit) {
 561                 Optional<Network> network = getNetwork(clientQuit.connection());
 562                 if (!network.isPresent()) {
 563                         return;
 564                 }
 565
 566                 networkBots.remove(network.get(), clientQuit.client().nick().get());
 567         }
 568
 569         /**
 570          * If the nickname of a bit changes, remove it from the old name and store it
 571          * under the new name.
 572          *
 573          * @param nicknameChanged
 574          *              The nickname changed event
 575          */
 576         @Subscribe
 577         public void nicknameChanged(NicknameChanged nicknameChanged) {
 578                 Optional<Network> network = getNetwork(nicknameChanged.connection());
 579                 if (!network.isPresent()) {
 580                         return;
 581                 }
 582
 583                 Bot bot = networkBots.remove(network.get(), nicknameChanged.client().nick().get());
 584                 if (bot == null) {
 585                         return;
 586                 }
 587
 588                 networkBots.put(network.get(), nicknameChanged.newNickname(), bot);
 589         }
 590
 591         /**
 592          * If a message on a channel is received, it is parsed for pack information
 593          * with is then added to a bot.
 594          *
 595          * @param channelMessageReceived
 596          *              The channel message received event
 597          */
 598         @Subscribe
 599         public void channelMessageReceived(ChannelMessageReceived channelMessageReceived) {
 600                 String message = MessageCleaner.getDefaultInstance().clean(channelMessageReceived.message());
 601                 if (!message.startsWith("#")) {
 602                         /* most probably not a pack announcement. */
 603                         return;
 604                 }
 605
 606                 Optional<Network> network = getNetwork(channelMessageReceived.connection());
 607                 if (!network.isPresent()) {
 608                         /* message for unknown connection? */
 609                         return;
 610                 }
 611
 612                 /* parse pack information. */
 613                 Optional<Pack> pack = parsePack(message);
 614                 if (!pack.isPresent()) {
 615                         return;
 616                 }
 617
 618                 Bot bot;
 619                 synchronized (networkBots) {
 620                         if (!networkBots.contains(network.get(), channelMessageReceived.source().nick().get())) {
 621                                 bot = new Bot(network.get(), channelMessageReceived.source().nick().get());
 622                                 networkBots.put(network.get(), channelMessageReceived.source().nick().get(), bot);
 623                                 eventBus.post(new BotAdded(bot));
 624                         } else {
 625                                 bot = networkBots.get(network.get(), channelMessageReceived.source().nick().get());
 626                         }
 627                 }
 628
 629                 /* add pack. */
 630                 bot.addPack(pack.get());
 631                 logger.fine(String.format("Bot %s now has %d packs.", bot, bot.packs().size()));
 632         }
 633
 634         /**
 635          * Forward all private messages to every console.
 636          *
 637          * @param privateMessageReceived
 638          *              The private message recevied event
 639          */
 640         @Subscribe
 641         public void privateMessageReceived(PrivateMessageReceived privateMessageReceived) {
 642                 eventBus.post(new MessageReceived(privateMessageReceived.source(), privateMessageReceived.message()));
 643         }
 644
 645         /**
 646          * Sends a message to all console when a notice was received.
 647          *
 648          * @param privateNoticeReceived
 649          *              The notice received event
 650          */
 651         @Subscribe
 652         public void privateNoticeReceived(PrivateNoticeReceived privateNoticeReceived) {
 653                 Optional<Network> network = getNetwork(privateNoticeReceived.connection());
 654                 if (!network.isPresent()) {
 655                         return;
 656                 }
 657
 658                 eventBus.post(new GenericMessage(String.format("Notice from %s (%s): %s", privateNoticeReceived.reply().source().get(), network.get(), privateNoticeReceived.text())));
 659         }
 660
 661         /**
 662          * Starts a DCC download.
 663          *
 664          * @param dccSendReceived
 665          *              The DCC SEND event
 666          */
 667         @Subscribe
 668         public void dccSendReceived(final DccSendReceived dccSendReceived) {
 669                 final Optional<Network> network = getNetwork(dccSendReceived.connection());
 670                 if (!network.isPresent()) {
 671                         return;
 672                 }
 673
 674                 Collection<Download> packDownloads = downloads.get(dccSendReceived.filename());
 675                 if (packDownloads.isEmpty()) {
 676                         /* unknown download, ignore. */
 677                         return;
 678                 }
 679
 680                 /* check if it’s already downloading. */
 681                 Collection<Download> runningDownloads = FluentIterable.from(packDownloads).filter(FILTER_RUNNING).toSet();
 682                 if (!runningDownloads.isEmpty()) {
 683                         eventBus.post(new GenericMessage(String.format("Ignoring offer for %s, it’s already being downloaded.", dccSendReceived.filename())));
 684                         return;
 685                 }
 686
 687                 /* locate the correct download. */
 688                 Collection<Download> requestedDownload = FluentIterable.from(packDownloads).filter(new Predicate<Download>() {
 689
 690                         @Override
 691                         public boolean apply(Download download) {
 692                                 return download.bot().network().equals(network.get()) && download.bot().name().equalsIgnoreCase(dccSendReceived.source().nick().get());
 693                         }
 694                 }).toSet();
 695
 696                 /* we did not request this download. */
 697                 if (requestedDownload.isEmpty()) {
 698                         return;
 699                 }
 700
 701                 Download download = requestedDownload.iterator().next();
 702
 703                 /* check if the file already exists. */
 704                 File outputFile = new File(temporaryDirectory, dccSendReceived.filename());
 705                 if (outputFile.exists()) {
 706                         long existingFileSize = outputFile.length();
 707
 708                         /* file already complete? */
 709                         if ((dccSendReceived.filesize() > -1) && (existingFileSize >= dccSendReceived.filesize())) {
 710                                 /* file is apparently already complete. just move it. */
 711                                 if (outputFile.renameTo(new File(finalDirectory, download.pack().name()))) {
 712                                         eventBus.post(new GenericMessage(String.format("File %s already downloaded.", download.pack().name())));
 713                                 } else {
 714                                         eventBus.post(new GenericMessage(String.format("File %s already downloaded but not moved to %s.", download.pack().name(), finalDirectory)));
 715                                 }
 716
 717                                 /* remove download. */
 718                                 downloads.removeAll(download.pack().name());
 719                                 return;
 720                         }
 721
 722                         /* file not complete yet, DCC resume it. */
 723                         try {
 724                                 download.remoteAddress(dccSendReceived.inetAddress()).filesize(dccSendReceived.filesize());
 725                                 dccSendReceived.connection().sendDccResume(dccSendReceived.source().nick().get(), dccSendReceived.filename(), dccSendReceived.port(), existingFileSize);
 726                         } catch (IOException ioe1) {
 727                                 eventBus.post(new GenericError(String.format("Could not send DCC RESUME %s to %s (%s).", dccSendReceived.filename(), dccSendReceived.source().nick().get(), ioe1.getMessage())));
 728                         }
 729
 730                         return;
 731                 }
 732
 733                 /* file does not exist, start the download. */
 734                 try {
 735                         OutputStream fileOutputStream = new FileOutputStream(outputFile);
 736                         DccReceiver dccReceiver = new DccReceiver(eventBus, dccSendReceived.inetAddress(), dccSendReceived.port(), dccSendReceived.filename(), dccSendReceived.filesize(), fileOutputStream);
 737                         download.filename(outputFile.getPath()).outputStream(fileOutputStream).dccReceiver(dccReceiver);
 738                         dccReceivers.add(dccReceiver);
 739                         dccReceiver.start();
 740                         eventBus.post(new DownloadStarted(download));
 741                 } catch (FileNotFoundException fnfe1) {
 742                         eventBus.post(new GenericError(String.format("Could not start download of %s from %s (%s).", dccSendReceived.filename(), dccSendReceived.source().nick().get(), fnfe1.getMessage())));
 743                 }
 744         }
 745
 746         @Subscribe
 747         public void dccAcceptReceived(final DccAcceptReceived dccAcceptReceived) {
 748                 final Optional<Network> network = getNetwork(dccAcceptReceived.connection());
 749                 if (!network.isPresent()) {
 750                         return;
 751                 }
 752
 753                 Collection<Download> packDownloads = downloads.get(dccAcceptReceived.filename());
 754                 if (packDownloads.isEmpty()) {
 755                         /* unknown download, ignore. */
 756                         return;
 757                 }
 758
 759                 /* check if it’s already downloading. */
 760                 Collection<Download> runningDownloads = FluentIterable.from(packDownloads).filter(FILTER_RUNNING).toSet();
 761                 if (!runningDownloads.isEmpty()) {
 762                         eventBus.post(new GenericMessage(String.format("Ignoring offer for %s, it’s already being downloaded.", dccAcceptReceived.filename())));
 763                         return;
 764                 }
 765
 766                 /* locate the correct download. */
 767                 Collection<Download> requestedDownload = FluentIterable.from(packDownloads).filter(new Predicate<Download>() {
 768
 769                         @Override
 770                         public boolean apply(Download download) {
 771                                 return download.bot().network().equals(network.get()) && download.bot().name().equalsIgnoreCase(dccAcceptReceived.source().nick().get());
 772                         }
 773                 }).toSet();
 774
 775                 /* we did not request this download. */
 776                 if (requestedDownload.isEmpty()) {
 777                         return;
 778                 }
 779
 780                 Download download = requestedDownload.iterator().next();
 781
 782                 try {
 783                         File outputFile = new File(temporaryDirectory, dccAcceptReceived.filename());
 784                         if (outputFile.length() != dccAcceptReceived.position()) {
 785                                 eventBus.post(new GenericError(String.format("Download %s from %s does not start at the right position!")));
 786                                 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()));
 787
 788                                 downloads.removeAll(download.pack().name());
 789                                 return;
 790                         }
 791                         OutputStream outputStream = new FileOutputStream(outputFile, true);
 792                         DccReceiver dccReceiver = new DccReceiver(eventBus, download.remoteAddress(), dccAcceptReceived.port(), dccAcceptReceived.filename(), dccAcceptReceived.position(), download.filesize(), outputStream);
 793                         download.filename(outputFile.getPath()).outputStream(outputStream).dccReceiver(dccReceiver);
 794                         dccReceivers.add(dccReceiver);
 795                         dccReceiver.start();
 796                         eventBus.post(new DownloadStarted(download));
 797                 } catch (FileNotFoundException fnfe1) {
 798                 }
 799         }
 800
 801         /**
 802          * Closes the output stream of the download and moves the file to the final
 803          * location.
 804          *
 805          * @param dccDownloadFinished
 806          *              The DCC download finished event
 807          */
 808         @Subscribe
 809         public void dccDownloadFinished(DccDownloadFinished dccDownloadFinished) {
 810
 811                 /* locate the correct download. */
 812                 Collection<Download> requestedDownload = FluentIterable.from(downloads.get(dccDownloadFinished.dccReceiver().filename())).filter(FILTER_RUNNING).toSet();
 813                 if (requestedDownload.isEmpty()) {
 814                         /* this seems wrong. */
 815                         logger.warning("Download finished but could not be located.");
 816                         return;
 817                 }
 818                 Download download = requestedDownload.iterator().next();
 819
 820                 try {
 821                         download.outputStream().close();
 822                         File file = new File(download.filename());
 823                         file.renameTo(new File(finalDirectory, download.pack().name()));
 824                         eventBus.post(new DownloadFinished(download));
 825                         dccReceivers.remove(dccDownloadFinished.dccReceiver());
 826                         downloads.removeAll(download.pack().name());
 827                 } catch (IOException ioe1) {
 828                         /* TODO - handle all the errors. */
 829                         logger.log(Level.WARNING, String.format("Could not move file %s to directory %s.", download.filename(), finalDirectory), ioe1);
 830                 }
 831         }
 832
 833         /**
 834          * Closes the output stream and notifies all listeners of the failure.
 835          *
 836          * @param dccDownloadFailed
 837          *              The DCC download failed event
 838          */
 839         @Subscribe
 840         public void dccDownloadFailed(DccDownloadFailed dccDownloadFailed) {
 841
 842                 /* locate the correct download. */
 843                 Collection<Download> requestedDownload = FluentIterable.from(downloads.get(dccDownloadFailed.dccReceiver().filename())).filter(FILTER_RUNNING).toSet();
 844                 if (requestedDownload.isEmpty()) {
 845                         /* this seems wrong. */
 846                         logger.warning("Download finished but could not be located.");
 847                         return;
 848                 }
 849                 Download download = requestedDownload.iterator().next();
 850
 851                 try {
 852                         Closeables.close(download.outputStream(), true);
 853                         eventBus.post(new DownloadFailed(download));
 854                         dccReceivers.remove(dccDownloadFailed.dccReceiver());
 855                         downloads.removeAll(download.pack().name());
 856                 } catch (IOException ioe1) {
 857                         /* swallow silently. */
 858                 }
 859         }
 860
 861         @Subscribe
 862         public void replyReceived(ReplyReceived replyReceived) {
 863                 logger.log(Level.FINEST, String.format("%s: %s", replyReceived.connection().hostname(), replyReceived.reply()));
 864         }
 865
 866         //
 867         // PRIVATE METHODS
 868         //
 869
 870         /**
 871          * Returns the download of the given pack from the given bot.
 872          *
 873          * @param pack
 874          *              The pack being downloaded
 875          * @param bot
 876          *              The bot the pack is being downloaded from
 877          * @return The download, or {@link Optional#absent()} if the download could not
 878          *         be found
 879          */
 880         private Optional<Download> getDownload(Pack pack, Bot bot) {
 881                 if (!downloads.containsKey(pack.name())) {
 882                         return Optional.absent();
 883                 }
 884                 for (Download download : Lists.newArrayList(downloads.get(pack.name()))) {
 885                         if (download.bot().equals(bot)) {
 886                                 return Optional.of(download);
 887                         }
 888                 }
 889                 return Optional.absent();
 890         }
 891
 892         /**
 893          * Searches all current connections for the given connection, returning the
 894          * associated network.
 895          *
 896          * @param connection
 897          *              The connection to get the network for
 898          * @return The network belonging to the connection, or {@link
 899          *         Optional#absent()}
 900          */
 901         private Optional<Network> getNetwork(Connection connection) {
 902                 for (Entry<Network, Connection> networkConnectionEntry : networkConnections.entrySet()) {
 903                         if (networkConnectionEntry.getValue().equals(connection)) {
 904                                 return Optional.of(networkConnectionEntry.getKey());
 905                         }
 906                 }
 907                 return Optional.absent();
 908         }
 909
 910         /**
 911          * Returns the configured channel for the given network and name.
 912          *
 913          * @param network
 914          *              The network the channel is located on
 915          * @param channelName
 916          *              The name of the channel
 917          * @return The configured channel, or {@link Optional#absent()} if no
 918          *         configured channel matching the given network and name was found
 919          */
 920         public Optional<Channel> getChannel(Network network, String channelName) {
 921                 for (Channel channel : channels) {
 922                         if (channel.network().equals(network) && (channel.name().equalsIgnoreCase(channelName))) {
 923                                 return Optional.of(channel);
 924                         }
 925                 }
 926                 return Optional.absent();
 927         }
 928
 929         /**
 930          * Returns the extra channel for the given network and name.
 931          *
 932          * @param network
 933          *              The network the channel is located on
 934          * @param channelName
 935          *              The name of the channel
 936          * @return The extra channel, or {@link Optional#absent()} if no extra channel
 937          *         matching the given network and name was found
 938          */
 939         public Optional<Channel> getExtraChannel(Network network, String channelName) {
 940                 for (Channel channel : extraChannels) {
 941                         if (channel.network().equals(network) && (channel.name().equalsIgnoreCase(channelName))) {
 942                                 return Optional.of(channel);
 943                         }
 944                 }
 945                 return Optional.absent();
 946         }
 947
 948         /**
 949          * Parses {@link Pack} information from the given message.
 950          *
 951          * @param message
 952          *              The message to parse pack information from
 953          * @return The parsed pack, or {@link Optional#absent()} if the message could
 954          *         not be parsed into a pack
 955          */
 956         private Optional<Pack> parsePack(String message) {
 957                 int squareOpen = message.indexOf('[');
 958                 int squareClose = message.indexOf(']', squareOpen);
 959                 if ((squareOpen == -1) && (squareClose == -1)) {
 960                         return Optional.absent();
 961                 }
 962                 String packSize = message.substring(squareOpen + 1, squareClose);
 963                 String packName = message.substring(message.lastIndexOf(' ') + 1);
 964                 String packIndex = message.substring(0, message.indexOf(' ')).substring(1);
 965                 return Optional.of(new Pack(packIndex, packSize, packName));
 966         }
 967
 968 }