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