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