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