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                                         try {
 349                                                 connection.joinChannel(channel.name());
 350                                         } catch (IOException ioe1) {
 351                                                 eventBus.post(new GenericMessage(String.format("Could not join %s on %s.", channel.name(), channel.network().name())));
 352                                         }
 353                                 }
 354                         }
 355                 }
 356         }
 357
 358         @Override
 359         protected void shutDown() {
 360         }
 361
 362         //
 363         // PRIVATE METHODS
 364         //
 365
 366         /**
 367          * Starts a new connection for the given network if no such connection exists
 368          * already.
 369          *
 370          * @param network
 371          *              The network to connect to
 372          */
 373         private void connectNetwork(Network network) {
 374                 if (!networkConnections.containsKey(network)) {
 375                                 /* select a random server. */
 376                         List<Server> servers = Lists.newArrayList(network.servers());
 377                         if (servers.isEmpty()) {
 378                                 eventBus.post(new GenericError(String.format("Network %s does not have any servers.", network.name())));
 379                                 return;
 380                         }
 381                         Server server = servers.get((int) (Math.random() * servers.size()));
 382                         Connection connection = new ConnectionBuilder(eventBus).connect(server.hostname()).port(server.unencryptedPorts().iterator().next()).build();
 383                         connection.username(RandomNickname.get()).realName(RandomNickname.get());
 384                         networkConnections.put(network, connection);
 385                         connection.start();
 386                 }
 387         }
 388
 389         /**
 390          * Removes the given connection and all its channels and bots.
 391          *
 392          * @param connection
 393          *              The connection to remove
 394          */
 395         private void removeConnection(Connection connection) {
 396                 Optional<Network> network = getNetwork(connection);
 397                 if (!network.isPresent()) {
 398                         return;
 399                 }
 400
 401                 /* find all channels that need to be removed. */
 402                 for (Collection<Channel> channels : ImmutableList.of(joinedChannels, extraChannels)) {
 403                         for (Iterator<Channel> channelIterator = channels.iterator(); channelIterator.hasNext(); ) {
 404                                 Channel joinedChannel = channelIterator.next();
 405                                 if (!joinedChannel.network().equals(network.get())) {
 406                                         continue;
 407                                 }
 408
 409                                 channelIterator.remove();
 410                         }
 411                 }
 412
 413                 /* now remove all bots for that network. */
 414                 Map<String, Bot> bots = networkBots.row(network.get());
 415                 int botCount = bots.size();
 416                 int packCount = 0;
 417                 for (Bot bot : bots.values()) {
 418                         packCount += bot.packs().size();
 419                 }
 420                 bots.clear();
 421                 eventBus.post(new GenericMessage(String.format("Network %s disconnected, %d bots removed, %d packs removed.", network.get().name(), botCount, packCount)));
 422
 423                 /* now remove the network. */
 424                 networkConnections.remove(network.get());
 425         }
 426
 427         //
 428         // EVENT HANDLERS
 429         //
 430
 431         /**
 432          * If a connection to a network has been established, the channels associated
 433          * with this network are joined.
 434          *
 435          * @param connectionEstablished
 436          *              The connection established event
 437          */
 438         @Subscribe
 439         public void connectionEstablished(ConnectionEstablished connectionEstablished) {
 440
 441                 /* get network for connection. */
 442                 Optional<Network> network = getNetwork(connectionEstablished.connection());
 443
 444                 /* found network? */
 445                 if (!network.isPresent()) {
 446                         return;
 447                 }
 448
 449                 /* join all channels on this network. */
 450                 for (Channel channel : channels) {
 451                         if (channel.network().equals(network.get())) {
 452                                 try {
 453                                         connectionEstablished.connection().joinChannel(channel.name());
 454                                 } catch (IOException ioe1) {
 455                                         logger.log(Level.WARNING, String.format("Could not join %s on %s!", channel.name(), network.get().name()), ioe1);
 456                                 }
 457                         }
 458                 }
 459         }
 460
 461         /**
 462          * Remove all data stored for a network if the connection is closed.
 463          *
 464          * @param connectionClosed
 465          *              The connection closed event
 466          */
 467         @Subscribe
 468         public void connectionClosed(ConnectionClosed connectionClosed) {
 469                 removeConnection(connectionClosed.connection());
 470         }
 471
 472         /**
 473          * Remove all data stored for a network if the connection fails.
 474          *
 475          * @param connectionFailed
 476          *              The connection failed event
 477          */
 478         public void connectionFailed(ConnectionFailed connectionFailed) {
 479                 removeConnection(connectionFailed.connection());
 480         }
 481
 482         /**
 483          * Shows a message when a channel was joined by us.
 484          *
 485          * @param channelJoined
 486          *              The channel joined event
 487          */
 488         @Subscribe
 489         public void channelJoined(ChannelJoined channelJoined) {
 490                 if (channelJoined.connection().isSource(channelJoined.client())) {
 491                         Optional<Network> network = getNetwork(channelJoined.connection());
 492                         if (!network.isPresent()) {
 493                                 return;
 494                         }
 495
 496                         Optional<Channel> channel = getChannel(network.get(), channelJoined.channel());
 497                         if (!channel.isPresent()) {
 498                                 /* it’s an extra channel. */
 499                                 extraChannels.add(new Channel(network.get(), channelJoined.channel()));
 500                                 logger.info(String.format("Joined extra Channel %s on %s.", channelJoined.channel(), network.get().name()));
 501                                 return;
 502                         }
 503
 504                         joinedChannels.add(channel.get());
 505                         logger.info(String.format("Joined Channel %s on %s.", channelJoined.channel(), network.get().name()));
 506                 }
 507         }
 508
 509         /**
 510          * Removes bots that leave a channel, or channels when it’s us that’s leaving.
 511          *
 512          * @param channelLeft
 513          *              The channel left event
 514          */
 515         @Subscribe
 516         public void channelLeft(ChannelLeft channelLeft) {
 517                 Optional<Network> network = getNetwork(channelLeft.connection());
 518                 if (!network.isPresent()) {
 519                         return;
 520                 }
 521
 522                 Bot bot = networkBots.get(network.get(), channelLeft.client().nick().get());
 523                 if (bot == null) {
 524                         /* maybe it was us? */
 525                         if (channelLeft.connection().isSource(channelLeft.client())) {
 526                                 Optional<Channel> channel = getChannel(network.get(), channelLeft.channel());
 527                                 if (!channel.isPresent()) {
 528                                         /* maybe it was an extra channel? */
 529                                         channel = getExtraChannel(network.get(), channelLeft.channel());
 530                                         if (!channel.isPresent()) {
 531                                                 /* okay, whatever. */
 532                                                 return;
 533                                         }
 534
 535                                         extraChannels.remove(channel);
 536                                 } else {
 537                                         channels.remove(channel.get());
 538                                 }
 539
 540                                 eventBus.post(new GenericMessage(String.format("Left Channel %s on %s.", channel.get().name(), channel.get().network().name())));
 541                         }
 542
 543                         return;
 544                 }
 545
 546                 Bot removedBot = networkBots.remove(network.get(), channelLeft.client().nick().get());
 547                 if (removedBot != null) {
 548                         eventBus.post(new GenericMessage(String.format("Bot %s (%s) was removed, %d packs removed.", removedBot.name(), removedBot.network().name(), removedBot.packs().size())));
 549                 }
 550         }
 551
 552         /**
 553          * Removes a client (which may be a bot) from the table of known bots.
 554          *
 555          * @param clientQuit
 556          *              The client quit event
 557          */
 558         @Subscribe
 559         public void clientQuit(ClientQuit clientQuit) {
 560                 Optional<Network> network = getNetwork(clientQuit.connection());
 561                 if (!network.isPresent()) {
 562                         return;
 563                 }
 564
 565                 Bot removedBot = networkBots.remove(network.get(), clientQuit.client().nick().get());
 566                 if (removedBot != null) {
 567                         eventBus.post(new GenericMessage(String.format("Bot %s (%s) was removed, %d packs removed.", removedBot.name(), removedBot.network().name(), removedBot.packs().size())));
 568                 }
 569         }
 570
 571         /**
 572          * If the nickname of a bit changes, remove it from the old name and store it
 573          * under the new name.
 574          *
 575          * @param nicknameChanged
 576          *              The nickname changed event
 577          */
 578         @Subscribe
 579         public void nicknameChanged(NicknameChanged nicknameChanged) {
 580                 Optional<Network> network = getNetwork(nicknameChanged.connection());
 581                 if (!network.isPresent()) {
 582                         return;
 583                 }
 584
 585                 Bot bot = networkBots.remove(network.get(), nicknameChanged.client().nick().get());
 586                 if (bot == null) {
 587                         return;
 588                 }
 589
 590                 networkBots.put(network.get(), nicknameChanged.newNickname(), bot);
 591         }
 592
 593         /**
 594          * If a message on a channel is received, it is parsed for pack information
 595          * with is then added to a bot.
 596          *
 597          * @param channelMessageReceived
 598          *              The channel message received event
 599          */
 600         @Subscribe
 601         public void channelMessageReceived(ChannelMessageReceived channelMessageReceived) {
 602                 String message = MessageCleaner.getDefaultInstance().clean(channelMessageReceived.message());
 603                 if (!message.startsWith("#")) {
 604                         /* most probably not a pack announcement. */
 605                         return;
 606                 }
 607
 608                 Optional<Network> network = getNetwork(channelMessageReceived.connection());
 609                 if (!network.isPresent()) {
 610                         /* message for unknown connection? */
 611                         return;
 612                 }
 613
 614                 /* parse pack information. */
 615                 Optional<Pack> pack = parsePack(message);
 616                 if (!pack.isPresent()) {
 617                         return;
 618                 }
 619
 620                 Bot bot;
 621                 synchronized (networkBots) {
 622                         if (!networkBots.contains(network.get(), channelMessageReceived.source().nick().get())) {
 623                                 bot = new Bot(network.get(), channelMessageReceived.source().nick().get());
 624                                 networkBots.put(network.get(), channelMessageReceived.source().nick().get(), bot);
 625                                 eventBus.post(new BotAdded(bot));
 626                         } else {
 627                                 bot = networkBots.get(network.get(), channelMessageReceived.source().nick().get());
 628                         }
 629                 }
 630
 631                 /* add pack. */
 632                 bot.addPack(pack.get());
 633                 logger.fine(String.format("Bot %s now has %d packs.", bot, bot.packs().size()));
 634         }
 635
 636         /**
 637          * Forward all private messages to every console.
 638          *
 639          * @param privateMessageReceived
 640          *              The private message recevied event
 641          */
 642         @Subscribe
 643         public void privateMessageReceived(PrivateMessageReceived privateMessageReceived) {
 644                 eventBus.post(new MessageReceived(privateMessageReceived.source(), privateMessageReceived.message()));
 645         }
 646
 647         /**
 648          * Sends a message to all console when a notice was received.
 649          *
 650          * @param privateNoticeReceived
 651          *              The notice received event
 652          */
 653         @Subscribe
 654         public void privateNoticeReceived(PrivateNoticeReceived privateNoticeReceived) {
 655                 Optional<Network> network = getNetwork(privateNoticeReceived.connection());
 656                 if (!network.isPresent()) {
 657                         return;
 658                 }
 659
 660                 eventBus.post(new GenericMessage(String.format("Notice from %s (%s): %s", privateNoticeReceived.reply().source().get(), network.get(), privateNoticeReceived.text())));
 661         }
 662
 663         /**
 664          * Starts a DCC download.
 665          *
 666          * @param dccSendReceived
 667          *              The DCC SEND event
 668          */
 669         @Subscribe
 670         public void dccSendReceived(final DccSendReceived dccSendReceived) {
 671                 final Optional<Network> network = getNetwork(dccSendReceived.connection());
 672                 if (!network.isPresent()) {
 673                         return;
 674                 }
 675
 676                 Collection<Download> packDownloads = downloads.get(dccSendReceived.filename());
 677                 if (packDownloads.isEmpty()) {
 678                         /* unknown download, ignore. */
 679                         return;
 680                 }
 681
 682                 /* check if it’s already downloading. */
 683                 Collection<Download> runningDownloads = FluentIterable.from(packDownloads).filter(FILTER_RUNNING).toSet();
 684                 if (!runningDownloads.isEmpty()) {
 685                         eventBus.post(new GenericMessage(String.format("Ignoring offer for %s, it’s already being downloaded.", dccSendReceived.filename())));
 686                         return;
 687                 }
 688
 689                 /* locate the correct download. */
 690                 Collection<Download> requestedDownload = FluentIterable.from(packDownloads).filter(new Predicate<Download>() {
 691
 692                         @Override
 693                         public boolean apply(Download download) {
 694                                 return download.bot().network().equals(network.get()) && download.bot().name().equalsIgnoreCase(dccSendReceived.source().nick().get());
 695                         }
 696                 }).toSet();
 697
 698                 /* we did not request this download. */
 699                 if (requestedDownload.isEmpty()) {
 700                         return;
 701                 }
 702
 703                 Download download = requestedDownload.iterator().next();
 704
 705                 /* check if the file already exists. */
 706                 File outputFile = new File(temporaryDirectory, dccSendReceived.filename());
 707                 if (outputFile.exists()) {
 708                         long existingFileSize = outputFile.length();
 709
 710                         /* file already complete? */
 711                         if ((dccSendReceived.filesize() > -1) && (existingFileSize >= dccSendReceived.filesize())) {
 712                                 /* file is apparently already complete. just move it. */
 713                                 if (outputFile.renameTo(new File(finalDirectory, download.pack().name()))) {
 714                                         eventBus.post(new GenericMessage(String.format("File %s already downloaded.", download.pack().name())));
 715                                 } else {
 716                                         eventBus.post(new GenericMessage(String.format("File %s already downloaded but not moved to %s.", download.pack().name(), finalDirectory)));
 717                                 }
 718
 719                                 /* remove download. */
 720                                 downloads.removeAll(download.pack().name());
 721                                 return;
 722                         }
 723
 724                         /* file not complete yet, DCC resume it. */
 725                         try {
 726                                 download.remoteAddress(dccSendReceived.inetAddress()).filesize(dccSendReceived.filesize());
 727                                 dccSendReceived.connection().sendDccResume(dccSendReceived.source().nick().get(), dccSendReceived.filename(), dccSendReceived.port(), existingFileSize);
 728                         } catch (IOException ioe1) {
 729                                 eventBus.post(new GenericError(String.format("Could not send DCC RESUME %s to %s (%s).", dccSendReceived.filename(), dccSendReceived.source().nick().get(), ioe1.getMessage())));
 730                         }
 731
 732                         return;
 733                 }
 734
 735                 /* file does not exist, start the download. */
 736                 try {
 737                         OutputStream fileOutputStream = new FileOutputStream(outputFile);
 738                         DccReceiver dccReceiver = new DccReceiver(eventBus, dccSendReceived.inetAddress(), dccSendReceived.port(), dccSendReceived.filename(), dccSendReceived.filesize(), fileOutputStream);
 739                         download.filename(outputFile.getPath()).outputStream(fileOutputStream).dccReceiver(dccReceiver);
 740                         dccReceivers.add(dccReceiver);
 741                         dccReceiver.start();
 742                         eventBus.post(new DownloadStarted(download));
 743                 } catch (FileNotFoundException fnfe1) {
 744                         eventBus.post(new GenericError(String.format("Could not start download of %s from %s (%s).", dccSendReceived.filename(), dccSendReceived.source().nick().get(), fnfe1.getMessage())));
 745                 }
 746         }
 747
 748         @Subscribe
 749         public void dccAcceptReceived(final DccAcceptReceived dccAcceptReceived) {
 750                 final Optional<Network> network = getNetwork(dccAcceptReceived.connection());
 751                 if (!network.isPresent()) {
 752                         return;
 753                 }
 754
 755                 Collection<Download> packDownloads = downloads.get(dccAcceptReceived.filename());
 756                 if (packDownloads.isEmpty()) {
 757                         /* unknown download, ignore. */
 758                         return;
 759                 }
 760
 761                 /* check if it’s already downloading. */
 762                 Collection<Download> runningDownloads = FluentIterable.from(packDownloads).filter(FILTER_RUNNING).toSet();
 763                 if (!runningDownloads.isEmpty()) {
 764                         eventBus.post(new GenericMessage(String.format("Ignoring offer for %s, it’s already being downloaded.", dccAcceptReceived.filename())));
 765                         return;
 766                 }
 767
 768                 /* locate the correct download. */
 769                 Collection<Download> requestedDownload = FluentIterable.from(packDownloads).filter(new Predicate<Download>() {
 770
 771                         @Override
 772                         public boolean apply(Download download) {
 773                                 return download.bot().network().equals(network.get()) && download.bot().name().equalsIgnoreCase(dccAcceptReceived.source().nick().get());
 774                         }
 775                 }).toSet();
 776
 777                 /* we did not request this download. */
 778                 if (requestedDownload.isEmpty()) {
 779                         return;
 780                 }
 781
 782                 Download download = requestedDownload.iterator().next();
 783
 784                 try {
 785                         File outputFile = new File(temporaryDirectory, dccAcceptReceived.filename());
 786                         if (outputFile.length() != dccAcceptReceived.position()) {
 787                                 eventBus.post(new GenericError(String.format("Download %s from %s does not start at the right position!")));
 788                                 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()));
 789
 790                                 downloads.removeAll(download.pack().name());
 791                                 return;
 792                         }
 793                         OutputStream outputStream = new FileOutputStream(outputFile, true);
 794                         DccReceiver dccReceiver = new DccReceiver(eventBus, download.remoteAddress(), dccAcceptReceived.port(), dccAcceptReceived.filename(), dccAcceptReceived.position(), download.filesize(), outputStream);
 795                         download.filename(outputFile.getPath()).outputStream(outputStream).dccReceiver(dccReceiver);
 796                         dccReceivers.add(dccReceiver);
 797                         dccReceiver.start();
 798                         eventBus.post(new DownloadStarted(download));
 799                 } catch (FileNotFoundException fnfe1) {
 800                 }
 801         }
 802
 803         /**
 804          * Closes the output stream of the download and moves the file to the final
 805          * location.
 806          *
 807          * @param dccDownloadFinished
 808          *              The DCC download finished event
 809          */
 810         @Subscribe
 811         public void dccDownloadFinished(DccDownloadFinished dccDownloadFinished) {
 812
 813                 /* locate the correct download. */
 814                 Collection<Download> requestedDownload = FluentIterable.from(downloads.get(dccDownloadFinished.dccReceiver().filename())).filter(FILTER_RUNNING).toSet();
 815                 if (requestedDownload.isEmpty()) {
 816                         /* this seems wrong. */
 817                         logger.warning("Download finished but could not be located.");
 818                         return;
 819                 }
 820                 Download download = requestedDownload.iterator().next();
 821
 822                 try {
 823                         download.outputStream().close();
 824                         File file = new File(download.filename());
 825                         file.renameTo(new File(finalDirectory, download.pack().name()));
 826                         eventBus.post(new DownloadFinished(download));
 827                         dccReceivers.remove(dccDownloadFinished.dccReceiver());
 828                         downloads.removeAll(download.pack().name());
 829                 } catch (IOException ioe1) {
 830                         /* TODO - handle all the errors. */
 831                         logger.log(Level.WARNING, String.format("Could not move file %s to directory %s.", download.filename(), finalDirectory), ioe1);
 832                 }
 833         }
 834
 835         /**
 836          * Closes the output stream and notifies all listeners of the failure.
 837          *
 838          * @param dccDownloadFailed
 839          *              The DCC download failed event
 840          */
 841         @Subscribe
 842         public void dccDownloadFailed(DccDownloadFailed dccDownloadFailed) {
 843
 844                 /* locate the correct download. */
 845                 Collection<Download> requestedDownload = FluentIterable.from(downloads.get(dccDownloadFailed.dccReceiver().filename())).filter(FILTER_RUNNING).toSet();
 846                 if (requestedDownload.isEmpty()) {
 847                         /* this seems wrong. */
 848                         logger.warning("Download finished but could not be located.");
 849                         return;
 850                 }
 851                 Download download = requestedDownload.iterator().next();
 852
 853                 try {
 854                         Closeables.close(download.outputStream(), true);
 855                         eventBus.post(new DownloadFailed(download));
 856                         dccReceivers.remove(dccDownloadFailed.dccReceiver());
 857                         downloads.removeAll(download.pack().name());
 858                 } catch (IOException ioe1) {
 859                         /* swallow silently. */
 860                 }
 861         }
 862
 863         @Subscribe
 864         public void replyReceived(ReplyReceived replyReceived) {
 865                 logger.log(Level.FINEST, String.format("%s: %s", replyReceived.connection().hostname(), replyReceived.reply()));
 866         }
 867
 868         //
 869         // PRIVATE METHODS
 870         //
 871
 872         /**
 873          * Returns the download of the given pack from the given bot.
 874          *
 875          * @param pack
 876          *              The pack being downloaded
 877          * @param bot
 878          *              The bot the pack is being downloaded from
 879          * @return The download, or {@link Optional#absent()} if the download could not
 880          *         be found
 881          */
 882         private Optional<Download> getDownload(Pack pack, Bot bot) {
 883                 if (!downloads.containsKey(pack.name())) {
 884                         return Optional.absent();
 885                 }
 886                 for (Download download : Lists.newArrayList(downloads.get(pack.name()))) {
 887                         if (download.bot().equals(bot)) {
 888                                 return Optional.of(download);
 889                         }
 890                 }
 891                 return Optional.absent();
 892         }
 893
 894         /**
 895          * Searches all current connections for the given connection, returning the
 896          * associated network.
 897          *
 898          * @param connection
 899          *              The connection to get the network for
 900          * @return The network belonging to the connection, or {@link
 901          *         Optional#absent()}
 902          */
 903         private Optional<Network> getNetwork(Connection connection) {
 904                 for (Entry<Network, Connection> networkConnectionEntry : networkConnections.entrySet()) {
 905                         if (networkConnectionEntry.getValue().equals(connection)) {
 906                                 return Optional.of(networkConnectionEntry.getKey());
 907                         }
 908                 }
 909                 return Optional.absent();
 910         }
 911
 912         /**
 913          * Returns the configured channel for the given network and name.
 914          *
 915          * @param network
 916          *              The network the channel is located on
 917          * @param channelName
 918          *              The name of the channel
 919          * @return The configured channel, or {@link Optional#absent()} if no
 920          *         configured channel matching the given network and name was found
 921          */
 922         public Optional<Channel> getChannel(Network network, String channelName) {
 923                 for (Channel channel : channels) {
 924                         if (channel.network().equals(network) && (channel.name().equalsIgnoreCase(channelName))) {
 925                                 return Optional.of(channel);
 926                         }
 927                 }
 928                 return Optional.absent();
 929         }
 930
 931         /**
 932          * Returns the extra channel for the given network and name.
 933          *
 934          * @param network
 935          *              The network the channel is located on
 936          * @param channelName
 937          *              The name of the channel
 938          * @return The extra channel, or {@link Optional#absent()} if no extra channel
 939          *         matching the given network and name was found
 940          */
 941         public Optional<Channel> getExtraChannel(Network network, String channelName) {
 942                 for (Channel channel : extraChannels) {
 943                         if (channel.network().equals(network) && (channel.name().equalsIgnoreCase(channelName))) {
 944                                 return Optional.of(channel);
 945                         }
 946                 }
 947                 return Optional.absent();
 948         }
 949
 950         /**
 951          * Parses {@link Pack} information from the given message.
 952          *
 953          * @param message
 954          *              The message to parse pack information from
 955          * @return The parsed pack, or {@link Optional#absent()} if the message could
 956          *         not be parsed into a pack
 957          */
 958         private Optional<Pack> parsePack(String message) {
 959                 int squareOpen = message.indexOf('[');
 960                 int squareClose = message.indexOf(']', squareOpen);
 961                 if ((squareOpen == -1) && (squareClose == -1)) {
 962                         return Optional.absent();
 963                 }
 964                 String packSize = message.substring(squareOpen + 1, squareClose);
 965                 String packName = message.substring(message.lastIndexOf(' ') + 1);
 966                 String packIndex = message.substring(0, message.indexOf(' ')).substring(1);
 967                 return Optional.of(new Pack(packIndex, packSize, packName));
 968         }
 969
 970 }