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.irc.util.MessageCleaner.getDefaultInstance;
  21 import static net.pterodactylus.xdcc.data.Channel.TO_NETWORK;
  22 import static net.pterodactylus.xdcc.data.Download.FILTER_RUNNING;
  23
  24 import java.io.File;
  25 import java.io.FileNotFoundException;
  26 import java.io.FileOutputStream;
  27 import java.io.IOException;
  28 import java.io.OutputStream;
  29 import java.util.Collection;
  30 import java.util.Collections;
  31 import java.util.Iterator;
  32 import java.util.List;
  33 import java.util.Map;
  34 import java.util.Map.Entry;
  35 import java.util.concurrent.TimeUnit;
  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.RandomNickname;
  56 import net.pterodactylus.xdcc.core.event.BotAdded;
  57 import net.pterodactylus.xdcc.core.event.CoreStarted;
  58 import net.pterodactylus.xdcc.core.event.DownloadFailed;
  59 import net.pterodactylus.xdcc.core.event.DownloadFinished;
  60 import net.pterodactylus.xdcc.core.event.DownloadStarted;
  61 import net.pterodactylus.xdcc.core.event.GenericError;
  62 import net.pterodactylus.xdcc.core.event.GenericMessage;
  63 import net.pterodactylus.xdcc.core.event.MessageReceived;
  64 import net.pterodactylus.xdcc.data.Bot;
  65 import net.pterodactylus.xdcc.data.Channel;
  66 import net.pterodactylus.xdcc.data.Download;
  67 import net.pterodactylus.xdcc.data.Network;
  68 import net.pterodactylus.xdcc.data.Pack;
  69 import net.pterodactylus.xdcc.data.Server;
  70
  71 import com.google.common.base.Function;
  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 import org.apache.log4j.Logger;
  90
  91 /**
  92  * The core of XDCC Downloader.
  93  *
  94  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  95  */
  96 public class Core extends AbstractExecutionThreadService {
  97
  98         /** The logger. */
  99         private static final Logger logger = Logger.getLogger(Core.class.getName());
 100
 101         /** The event bus. */
 102         private final EventBus eventBus;
 103
 104         /** The temporary directory to download files to. */
 105         private final String temporaryDirectory;
 106
 107         /** The directory to move finished downloads to. */
 108         private final String finalDirectory;
 109
 110         /** The channels that should be monitored. */
 111         private final Collection<Channel> channels = Sets.newHashSet();
 112
 113         /** The channels that are currentlymonitored. */
 114         private final Collection<Channel> joinedChannels = Sets.newHashSet();
 115
 116         /** The channels that are joined but not configured. */
 117         private final Collection<Channel> extraChannels = Sets.newHashSet();
 118
 119         /** The current network connections. */
 120         private final Map<Network, Connection> networkConnections = Collections.synchronizedMap(Maps.<Network, Connection>newHashMap());
 121
 122         /** The currently known bots. */
 123         private final Table<Network, String, Bot> networkBots = HashBasedTable.create();
 124
 125         /** The current downloads. */
 126         private final Multimap<String, Download> downloads = HashMultimap.create();
 127
 128         /** The current DCC receivers. */
 129         private final Collection<DccReceiver> dccReceivers = Lists.newArrayList();
 130
 131         /**
 132          * Creates a new core.
 133          *
 134          * @param eventBus
 135          *              The event bus
 136          * @param temporaryDirectory
 137          *              The directory to download files to
 138          * @param finalDirectory
 139          *              The directory to move finished files to
 140          */
 141         @Inject
 142         public Core(EventBus eventBus, String temporaryDirectory, String finalDirectory) {
 143                 this.eventBus = eventBus;
 144                 this.temporaryDirectory = temporaryDirectory;
 145                 this.finalDirectory = finalDirectory;
 146         }
 147
 148         //
 149         // ACCESSORS
 150         //
 151
 152         /**
 153          * Returns all currently known connections.
 154          *
 155          * @return All currently known connections
 156          */
 157         public Collection<Connection> connections() {
 158                 return networkConnections.values();
 159         }
 160
 161         /**
 162          * Returns all defined networks.
 163          *
 164          * @return All defined networks
 165          */
 166         public Collection<Network> networks() {
 167                 return FluentIterable.from(channels).transform(TO_NETWORK).toSet();
 168         }
 169
 170         /**
 171          * Returns all connected networks.
 172          *
 173          * @return All connected networks
 174          */
 175         public Collection<Network> connectedNetworks() {
 176                 return Lists.newArrayList(Optional.presentInstances(FluentIterable.from(networkConnections.values()).transform(new Function<Connection, Optional<Network>>() {
 177                         @Override
 178                         public Optional<Network> apply(Connection connection) {
 179                                 return getNetwork(connection);
 180                         }
 181                 })));
 182         }
 183
 184         /**
 185          * Returns all configured channels. Due to various circumstances, configured
 186          * channels might not actually be joined.
 187          *
 188          * @return All configured channels
 189          */
 190         public Collection<Channel> channels() {
 191                 return ImmutableSet.copyOf(channels);
 192         }
 193
 194         /**
 195          * Returns all currently joined channels.
 196          *
 197          * @return All currently joined channels
 198          */
 199         public Collection<Channel> joinedChannels() {
 200                 return ImmutableSet.copyOf(joinedChannels);
 201         }
 202
 203         /**
 204          * Returns all currently joined channels that are not configured.
 205          *
 206          * @return All currently joined but not configured channels
 207          */
 208         public Collection<Channel> extraChannels() {
 209                 return ImmutableSet.copyOf(extraChannels);
 210         }
 211
 212         /**
 213          * Returns all currently known bots.
 214          *
 215          * @return All currently known bots
 216          */
 217         public Collection<Bot> bots() {
 218                 return networkBots.values();
 219         }
 220
 221         /**
 222          * Returns all currently running downloads.
 223          *
 224          * @return All currently running downloads
 225          */
 226         public Collection<Download> downloads() {
 227                 return downloads.values();
 228         }
 229
 230         //
 231         // ACTIONS
 232         //
 233
 234         /**
 235          * Adds a channel to monitor.
 236          *
 237          * @param channel
 238          *              The channel to monitor
 239          */
 240         public void addChannel(Channel channel) {
 241                 channels.add(channel);
 242         }
 243
 244         /**
 245          * Fetches the given pack from the given bot.
 246          *
 247          * @param bot
 248          *              The bot to fetch the pack from
 249          * @param pack
 250          *              The pack to fetch
 251          */
 252         public void fetch(Bot bot, Pack pack) {
 253                 Connection connection = networkConnections.get(bot.network());
 254                 if (connection == null) {
 255                         return;
 256                 }
 257
 258                 /* check if we are already downloading the file? */
 259                 if (downloads.containsKey(pack.name())) {
 260                         Collection<Download> packDownloads = downloads.get(pack.name());
 261                         Collection<Download> runningDownloads = FluentIterable.from(packDownloads).filter(FILTER_RUNNING).toSet();
 262                         if (!runningDownloads.isEmpty()) {
 263                                 Download download = runningDownloads.iterator().next();
 264                                 eventBus.post(new GenericMessage(String.format("File %s is already downloading from %s (%s).", pack.name(), download.bot().name(), download.bot().network().name())));
 265                                 return;
 266                         }
 267                         StringBuilder bots = new StringBuilder();
 268                         for (Download download : packDownloads) {
 269                                 if (bots.length() > 0) {
 270                                         bots.append(", ");
 271                                 }
 272                                 bots.append(download.bot().name()).append(" (").append(download.bot().network().name()).append(')');
 273                         }
 274                         eventBus.post(new GenericMessage(String.format("File %s is already requested from %d bots (%s).", pack.name(), packDownloads.size(), bots.toString())));
 275                 }
 276
 277                 Download download = new Download(bot, pack);
 278                 downloads.put(pack.name(), download);
 279
 280                 try {
 281                         connection.sendMessage(bot.name(), "XDCC SEND " + pack.id());
 282                 } catch (IOException ioe1) {
 283                         logger.warn("Could not send message to bot!", ioe1);
 284                 }
 285         }
 286
 287         /**
 288          * Cancels the download of the given pack from the given bot.
 289          *
 290          * @param bot
 291          *              The bot the pack is being downloaded from
 292          * @param pack
 293          *              The pack being downloaded
 294          */
 295         public void cancelDownload(Bot bot, Pack pack) {
 296                 Optional<Download> download = getDownload(pack, bot);
 297                 if (!download.isPresent()) {
 298                         return;
 299                 }
 300
 301                 /* get connection. */
 302                 Connection connection = networkConnections.get(bot.network());
 303                 if (connection == null) {
 304                         /* request for unknown network? */
 305                         return;
 306                 }
 307
 308                 /* stop the DCC receiver. */
 309                 if (download.get().dccReceiver() != null) {
 310                         download.get().dccReceiver().stop();
 311                 } else {
 312                         /* remove download if it hasn’t started yet. */
 313                         downloads.remove(pack.name(), download.get());
 314                 }
 315
 316                 /* remove the request from the bot, too. */
 317                 try {
 318                         connection.sendMessage(bot.name(), String.format("XDCC %s", (download.get().dccReceiver() != null) ? "CANCEL" : "REMOVE"));
 319                 } catch (IOException ioe1) {
 320                         logger.warn(String.format("Could not cancel DCC from %s (%s)!", bot.name(), bot.network().name()), ioe1);
 321                 }
 322         }
 323
 324         /**
 325          * Closes the given connection.
 326          *
 327          * @param connection
 328          *              The connection to close
 329          */
 330         public void closeConnection(Connection connection) {
 331                 try {
 332                         connection.close();
 333                 } catch (IOException ioe1) {
 334                         /* TODO */
 335                 }
 336         }
 337
 338         //
 339         // ABSTRACTIDLESERVICE METHODS
 340         //
 341
 342         @Override
 343         protected void startUp() {
 344                 for (Channel channel : channels) {
 345                         logger.info(String.format("Connecting to Channel %s on Network %s…", channel.name(), channel.network().name()));
 346                         connectNetwork(channel.network());
 347                 }
 348
 349                 /* notify listeners. */
 350                 eventBus.post(new CoreStarted(this));
 351         }
 352
 353         @Override
 354         protected void run() throws Exception {
 355                 while (isRunning()) {
 356                         try {
 357                                 Thread.sleep(TimeUnit.MINUTES.toMillis(1));
 358                         } catch (InterruptedException ie1) {
 359                                 /* ignore. */
 360                         }
 361
 362                         /* find channels that should be monitored but are not. */
 363                         for (Channel channel : channels) {
 364                                 if (joinedChannels.contains(channel)) {
 365                                         continue;
 366                                 }
 367
 368                                 connectNetwork(channel.network());
 369                                 Connection connection = networkConnections.get(channel.network());
 370                                 if (connection.established()) {
 371                                         eventBus.post(new GenericMessage(String.format("Trying to join %s on %s.", channel.name(), channel.network().name())));
 372                                         try {
 373                                                 connection.joinChannel(channel.name());
 374                                         } catch (IOException ioe1) {
 375                                                 eventBus.post(new GenericMessage(String.format("Could not join %s on %s.", channel.name(), channel.network().name())));
 376                                         }
 377                                 }
 378                         }
 379                 }
 380         }
 381
 382         @Override
 383         protected void shutDown() {
 384         }
 385
 386         //
 387         // PRIVATE METHODS
 388         //
 389
 390         /**
 391          * Starts a new connection for the given network if no such connection exists
 392          * already.
 393          *
 394          * @param network
 395          *              The network to connect to
 396          */
 397         private void connectNetwork(Network network) {
 398                 if (!networkConnections.containsKey(network)) {
 399                                 /* select a random server. */
 400                         List<Server> servers = Lists.newArrayList(network.servers());
 401                         if (servers.isEmpty()) {
 402                                 eventBus.post(new GenericError(String.format("Network %s does not have any servers.", network.name())));
 403                                 return;
 404                         }
 405                         Server server = servers.get((int) (Math.random() * servers.size()));
 406                         Connection connection = new ConnectionBuilder(eventBus).connect(server.hostname()).port(server.unencryptedPorts().iterator().next()).build();
 407                         connection.username(RandomNickname.get()).realName(RandomNickname.get());
 408                         networkConnections.put(network, connection);
 409                         connection.start();
 410                 }
 411         }
 412
 413         /**
 414          * Removes the given connection and all its channels and bots.
 415          *
 416          * @param connection
 417          *              The connection to remove
 418          */
 419         private void removeConnection(Connection connection) {
 420                 Optional<Network> network = getNetwork(connection);
 421                 if (!network.isPresent()) {
 422                         return;
 423                 }
 424
 425                 /* find all channels that need to be removed. */
 426                 for (Collection<Channel> channels : ImmutableList.of(joinedChannels, extraChannels)) {
 427                         for (Iterator<Channel> channelIterator = channels.iterator(); channelIterator.hasNext(); ) {
 428                                 Channel joinedChannel = channelIterator.next();
 429                                 if (!joinedChannel.network().equals(network.get())) {
 430                                         continue;
 431                                 }
 432
 433                                 channelIterator.remove();
 434                         }
 435                 }
 436
 437                 /* now remove all bots for that network. */
 438                 Map<String, Bot> bots = networkBots.row(network.get());
 439                 int botCount = bots.size();
 440                 int packCount = 0;
 441                 for (Bot bot : bots.values()) {
 442                         packCount += bot.packs().size();
 443                 }
 444                 bots.clear();
 445                 eventBus.post(new GenericMessage(String.format("Network %s disconnected, %d bots removed, %d packs removed.", network.get().name(), botCount, packCount)));
 446
 447                 /* now remove the network. */
 448                 networkConnections.remove(network.get());
 449         }
 450
 451         //
 452         // EVENT HANDLERS
 453         //
 454
 455         /**
 456          * If a connection to a network has been established, the channels associated
 457          * with this network are joined.
 458          *
 459          * @param connectionEstablished
 460          *              The connection established event
 461          */
 462         @Subscribe
 463         public void connectionEstablished(ConnectionEstablished connectionEstablished) {
 464
 465                 /* get network for connection. */
 466                 Optional<Network> network = getNetwork(connectionEstablished.connection());
 467
 468                 /* found network? */
 469                 if (!network.isPresent()) {
 470                         eventBus.post(new GenericMessage(String.format("Connected to unknown network: %s", connectionEstablished.connection().hostname())));
 471                         return;
 472                 }
 473
 474                 eventBus.post(new GenericMessage(String.format("Connected to network %s.", network.get().name())));
 475
 476                 /* join all channels on this network. */
 477                 for (Channel channel : channels) {
 478                         if (channel.network().equals(network.get())) {
 479                                 try {
 480                                         eventBus.post(new GenericMessage(String.format("Trying to join %s on %s...", channel.name(), network.get().name())));
 481                                         connectionEstablished.connection().joinChannel(channel.name());
 482                                 } catch (IOException ioe1) {
 483                                         logger.warn(String.format("Could not join %s on %s!", channel.name(), network.get().name()), ioe1);
 484                                 }
 485                         }
 486                 }
 487         }
 488
 489         /**
 490          * Remove all data stored for a network if the connection is closed.
 491          *
 492          * @param connectionClosed
 493          *              The connection closed event
 494          */
 495         @Subscribe
 496         public void connectionClosed(ConnectionClosed connectionClosed) {
 497                 removeConnection(connectionClosed.connection());
 498         }
 499
 500         /**
 501          * Remove all data stored for a network if the connection fails.
 502          *
 503          * @param connectionFailed
 504          *              The connection failed event
 505          */
 506         @Subscribe
 507         public void connectionFailed(ConnectionFailed connectionFailed) {
 508                 removeConnection(connectionFailed.connection());
 509         }
 510
 511         /**
 512          * Shows a message when a channel was joined by us.
 513          *
 514          * @param channelJoined
 515          *              The channel joined event
 516          */
 517         @Subscribe
 518         public void channelJoined(ChannelJoined channelJoined) {
 519                 if (channelJoined.connection().isSource(channelJoined.client())) {
 520                         Optional<Network> network = getNetwork(channelJoined.connection());
 521                         if (!network.isPresent()) {
 522                                 return;
 523                         }
 524
 525                         Optional<Channel> channel = getChannel(network.get(), channelJoined.channel());
 526                         if (!channel.isPresent()) {
 527                                 /* it’s an extra channel. */
 528                                 extraChannels.add(new Channel(network.get(), channelJoined.channel()));
 529                                 logger.info(String.format("Joined extra Channel %s on %s.", channelJoined.channel(), network.get().name()));
 530                                 return;
 531                         }
 532
 533                         joinedChannels.add(channel.get());
 534                         logger.info(String.format("Joined Channel %s on %s.", channelJoined.channel(), network.get().name()));
 535                 }
 536         }
 537
 538         /**
 539          * Removes bots that leave a channel, or channels when it’s us that’s leaving.
 540          *
 541          * @param channelLeft
 542          *              The channel left event
 543          */
 544         @Subscribe
 545         public void channelLeft(ChannelLeft channelLeft) {
 546                 Optional<Network> network = getNetwork(channelLeft.connection());
 547                 if (!network.isPresent()) {
 548                         return;
 549                 }
 550
 551                 Bot bot = networkBots.get(network.get(), channelLeft.client().nick().get());
 552                 if (bot == null) {
 553                         /* maybe it was us? */
 554                         if (channelLeft.connection().isSource(channelLeft.client())) {
 555                                 Optional<Channel> channel = getChannel(network.get(), channelLeft.channel());
 556                                 if (!channel.isPresent()) {
 557                                         /* maybe it was an extra channel? */
 558                                         channel = getExtraChannel(network.get(), channelLeft.channel());
 559                                         if (!channel.isPresent()) {
 560                                                 /* okay, whatever. */
 561                                                 return;
 562                                         }
 563
 564                                         extraChannels.remove(channel);
 565                                 } else {
 566                                         channels.remove(channel.get());
 567                                 }
 568
 569                                 eventBus.post(new GenericMessage(String.format("Left Channel %s on %s.", channel.get().name(), channel.get().network().name())));
 570                         }
 571
 572                         return;
 573                 }
 574
 575                 networkBots.remove(network.get(), channelLeft.client().nick().get());
 576         }
 577
 578         /**
 579          * Removes a client (which may be a bot) from the table of known bots.
 580          *
 581          * @param clientQuit
 582          *              The client quit event
 583          */
 584         @Subscribe
 585         public void clientQuit(ClientQuit clientQuit) {
 586                 Optional<Network> network = getNetwork(clientQuit.connection());
 587                 if (!network.isPresent()) {
 588                         return;
 589                 }
 590
 591                 networkBots.remove(network.get(), clientQuit.client().nick().get());
 592         }
 593
 594         /**
 595          * If the nickname of a bit changes, remove it from the old name and store it
 596          * under the new name.
 597          *
 598          * @param nicknameChanged
 599          *              The nickname changed event
 600          */
 601         @Subscribe
 602         public void nicknameChanged(NicknameChanged nicknameChanged) {
 603                 Optional<Network> network = getNetwork(nicknameChanged.connection());
 604                 if (!network.isPresent()) {
 605                         return;
 606                 }
 607
 608                 Bot bot = networkBots.remove(network.get(), nicknameChanged.client().nick().get());
 609                 if (bot == null) {
 610                         return;
 611                 }
 612
 613                 networkBots.put(network.get(), nicknameChanged.newNickname(), bot);
 614         }
 615
 616         /**
 617          * If a message on a channel is received, it is parsed for pack information
 618          * with is then added to a bot.
 619          *
 620          * @param channelMessageReceived
 621          *              The channel message received event
 622          */
 623         @Subscribe
 624         public void channelMessageReceived(ChannelMessageReceived channelMessageReceived) {
 625                 String message = getDefaultInstance().clean(channelMessageReceived.message());
 626                 if (!message.startsWith("#")) {
 627                         /* most probably not a pack announcement. */
 628                         return;
 629                 }
 630
 631                 Optional<Network> network = getNetwork(channelMessageReceived.connection());
 632                 if (!network.isPresent()) {
 633                         /* message for unknown connection? */
 634                         return;
 635                 }
 636
 637                 /* parse pack information. */
 638                 Optional<Pack> pack = parsePack(message);
 639                 if (!pack.isPresent()) {
 640                         return;
 641                 }
 642
 643                 Bot bot;
 644                 synchronized (networkBots) {
 645                         if (!networkBots.contains(network.get(), channelMessageReceived.source().nick().get())) {
 646                                 bot = new Bot(network.get(), channelMessageReceived.source().nick().get());
 647                                 networkBots.put(network.get(), channelMessageReceived.source().nick().get(), bot);
 648                                 eventBus.post(new BotAdded(bot));
 649                         } else {
 650                                 bot = networkBots.get(network.get(), channelMessageReceived.source().nick().get());
 651                         }
 652                 }
 653
 654                 /* add pack. */
 655                 bot.addPack(pack.get());
 656                 logger.debug(String.format("Bot %s now has %d packs.", bot, bot.packs().size()));
 657         }
 658
 659         /**
 660          * Forward all private messages to every console.
 661          *
 662          * @param privateMessageReceived
 663          *              The private message recevied event
 664          */
 665         @Subscribe
 666         public void privateMessageReceived(PrivateMessageReceived privateMessageReceived) {
 667                 eventBus.post(new MessageReceived(privateMessageReceived.source(), privateMessageReceived.message()));
 668         }
 669
 670         /**
 671          * Sends a message to all console when a notice was received.
 672          *
 673          * @param privateNoticeReceived
 674          *              The notice received event
 675          */
 676         @Subscribe
 677         public void privateNoticeReceived(PrivateNoticeReceived privateNoticeReceived) {
 678                 Optional<Network> network = getNetwork(privateNoticeReceived.connection());
 679                 if (!network.isPresent()) {
 680                         return;
 681                 }
 682
 683                 eventBus.post(new GenericMessage(String.format("Notice from %s (%s): %s", privateNoticeReceived.reply().source().get(), network.get(), privateNoticeReceived.text())));
 684         }
 685
 686         /**
 687          * Starts a DCC download.
 688          *
 689          * @param dccSendReceived
 690          *              The DCC SEND event
 691          */
 692         @Subscribe
 693         public void dccSendReceived(final DccSendReceived dccSendReceived) {
 694                 final Optional<Network> network = getNetwork(dccSendReceived.connection());
 695                 if (!network.isPresent()) {
 696                         return;
 697                 }
 698
 699                 Collection<Download> packDownloads = downloads.get(dccSendReceived.filename());
 700                 if (packDownloads.isEmpty()) {
 701                         /* unknown download, ignore. */
 702                         return;
 703                 }
 704
 705                 /* check if it’s already downloading. */
 706                 Collection<Download> runningDownloads = FluentIterable.from(packDownloads).filter(FILTER_RUNNING).toSet();
 707                 if (!runningDownloads.isEmpty()) {
 708                         eventBus.post(new GenericMessage(String.format("Ignoring offer for %s, it’s already being downloaded.", dccSendReceived.filename())));
 709                         return;
 710                 }
 711
 712                 /* locate the correct download. */
 713                 Collection<Download> requestedDownload = FluentIterable.from(packDownloads).filter(new Predicate<Download>() {
 714
 715                         @Override
 716                         public boolean apply(Download download) {
 717                                 return download.bot().network().equals(network.get()) && download.bot().name().equalsIgnoreCase(dccSendReceived.source().nick().get());
 718                         }
 719                 }).toSet();
 720
 721                 /* we did not request this download. */
 722                 if (requestedDownload.isEmpty()) {
 723                         return;
 724                 }
 725
 726                 Download download = requestedDownload.iterator().next();
 727
 728                 /* check if the file already exists. */
 729                 File outputFile = new File(temporaryDirectory, dccSendReceived.filename());
 730                 if (outputFile.exists()) {
 731                         long existingFileSize = outputFile.length();
 732
 733                         /* file already complete? */
 734                         if ((dccSendReceived.filesize() > -1) && (existingFileSize >= dccSendReceived.filesize())) {
 735                                 /* file is apparently already complete. just move it. */
 736                                 if (outputFile.renameTo(new File(finalDirectory, download.pack().name()))) {
 737                                         eventBus.post(new GenericMessage(String.format("File %s already downloaded.", download.pack().name())));
 738                                 } else {
 739                                         eventBus.post(new GenericMessage(String.format("File %s already downloaded but not moved to %s.", download.pack().name(), finalDirectory)));
 740                                 }
 741
 742                                 /* remove download. */
 743                                 downloads.removeAll(download.pack().name());
 744                                 return;
 745                         }
 746
 747                         /* file not complete yet, DCC resume it. */
 748                         try {
 749                                 download.remoteAddress(dccSendReceived.inetAddress()).filesize(dccSendReceived.filesize());
 750                                 dccSendReceived.connection().sendDccResume(dccSendReceived.source().nick().get(), dccSendReceived.filename(), dccSendReceived.port(), existingFileSize);
 751                         } catch (IOException ioe1) {
 752                                 eventBus.post(new GenericError(String.format("Could not send DCC RESUME %s to %s (%s).", dccSendReceived.filename(), dccSendReceived.source().nick().get(), ioe1.getMessage())));
 753                         }
 754
 755                         return;
 756                 }
 757
 758                 /* file does not exist, start the download. */
 759                 try {
 760                         OutputStream fileOutputStream = new FileOutputStream(outputFile);
 761                         DccReceiver dccReceiver = new DccReceiver(eventBus, dccSendReceived.inetAddress(), dccSendReceived.port(), dccSendReceived.filename(), dccSendReceived.filesize(), fileOutputStream);
 762                         download.filename(outputFile.getPath()).outputStream(fileOutputStream).dccReceiver(dccReceiver);
 763                         dccReceivers.add(dccReceiver);
 764                         dccReceiver.start();
 765                         eventBus.post(new DownloadStarted(download));
 766                 } catch (FileNotFoundException fnfe1) {
 767                         eventBus.post(new GenericError(String.format("Could not start download of %s from %s (%s).", dccSendReceived.filename(), dccSendReceived.source().nick().get(), fnfe1.getMessage())));
 768                 }
 769         }
 770
 771         @Subscribe
 772         public void dccAcceptReceived(final DccAcceptReceived dccAcceptReceived) {
 773                 final Optional<Network> network = getNetwork(dccAcceptReceived.connection());
 774                 if (!network.isPresent()) {
 775                         return;
 776                 }
 777
 778                 Collection<Download> packDownloads = downloads.get(dccAcceptReceived.filename());
 779                 if (packDownloads.isEmpty()) {
 780                         /* unknown download, ignore. */
 781                         return;
 782                 }
 783
 784                 /* check if it’s already downloading. */
 785                 Collection<Download> runningDownloads = FluentIterable.from(packDownloads).filter(FILTER_RUNNING).toSet();
 786                 if (!runningDownloads.isEmpty()) {
 787                         eventBus.post(new GenericMessage(String.format("Ignoring offer for %s, it’s already being downloaded.", dccAcceptReceived.filename())));
 788                         return;
 789                 }
 790
 791                 /* locate the correct download. */
 792                 Collection<Download> requestedDownload = FluentIterable.from(packDownloads).filter(new Predicate<Download>() {
 793
 794                         @Override
 795                         public boolean apply(Download download) {
 796                                 return download.bot().network().equals(network.get()) && download.bot().name().equalsIgnoreCase(dccAcceptReceived.source().nick().get());
 797                         }
 798                 }).toSet();
 799
 800                 /* we did not request this download. */
 801                 if (requestedDownload.isEmpty()) {
 802                         return;
 803                 }
 804
 805                 Download download = requestedDownload.iterator().next();
 806
 807                 try {
 808                         File outputFile = new File(temporaryDirectory, dccAcceptReceived.filename());
 809                         if (outputFile.length() != dccAcceptReceived.position()) {
 810                                 eventBus.post(new GenericError(String.format("Download %s from %s does not start at the right position!")));
 811                                 logger.warn(String.format("Download %s from %s: have %d bytes but wants to resume from %d!", dccAcceptReceived.filename(), dccAcceptReceived.source(), outputFile.length(), dccAcceptReceived.position()));
 812
 813                                 downloads.removeAll(download.pack().name());
 814                                 return;
 815                         }
 816                         OutputStream outputStream = new FileOutputStream(outputFile, true);
 817                         DccReceiver dccReceiver = new DccReceiver(eventBus, download.remoteAddress(), dccAcceptReceived.port(), dccAcceptReceived.filename(), dccAcceptReceived.position(), download.filesize(), outputStream);
 818                         download.filename(outputFile.getPath()).outputStream(outputStream).dccReceiver(dccReceiver);
 819                         dccReceivers.add(dccReceiver);
 820                         dccReceiver.start();
 821                         eventBus.post(new DownloadStarted(download));
 822                 } catch (FileNotFoundException fnfe1) {
 823                 }
 824         }
 825
 826         /**
 827          * Closes the output stream of the download and moves the file to the final
 828          * location.
 829          *
 830          * @param dccDownloadFinished
 831          *              The DCC download finished event
 832          */
 833         @Subscribe
 834         public void dccDownloadFinished(DccDownloadFinished dccDownloadFinished) {
 835
 836                 /* locate the correct download. */
 837                 Collection<Download> requestedDownload = FluentIterable.from(downloads.get(dccDownloadFinished.dccReceiver().filename())).filter(FILTER_RUNNING).toSet();
 838                 if (requestedDownload.isEmpty()) {
 839                         /* this seems wrong. */
 840                         logger.warn("Download finished but could not be located.");
 841                         return;
 842                 }
 843                 Download download = requestedDownload.iterator().next();
 844
 845                 try {
 846                         download.outputStream().close();
 847                         File file = new File(download.filename());
 848                         file.renameTo(new File(finalDirectory, download.pack().name()));
 849                         eventBus.post(new DownloadFinished(download));
 850                         dccReceivers.remove(dccDownloadFinished.dccReceiver());
 851                         downloads.removeAll(download.pack().name());
 852                 } catch (IOException ioe1) {
 853                         /* TODO - handle all the errors. */
 854                         logger.warn(String.format("Could not move file %s to directory %s.", download.filename(), finalDirectory), ioe1);
 855                 }
 856         }
 857
 858         /**
 859          * Closes the output stream and notifies all listeners of the failure.
 860          *
 861          * @param dccDownloadFailed
 862          *              The DCC download failed event
 863          */
 864         @Subscribe
 865         public void dccDownloadFailed(DccDownloadFailed dccDownloadFailed) {
 866
 867                 /* locate the correct download. */
 868                 Collection<Download> requestedDownload = FluentIterable.from(downloads.get(dccDownloadFailed.dccReceiver().filename())).filter(FILTER_RUNNING).toSet();
 869                 if (requestedDownload.isEmpty()) {
 870                         /* this seems wrong. */
 871                         logger.warn("Download finished but could not be located.");
 872                         return;
 873                 }
 874                 Download download = requestedDownload.iterator().next();
 875
 876                 try {
 877                         Closeables.close(download.outputStream(), true);
 878                         eventBus.post(new DownloadFailed(download));
 879                         dccReceivers.remove(dccDownloadFailed.dccReceiver());
 880                         downloads.removeAll(download.pack().name());
 881                 } catch (IOException ioe1) {
 882                         /* swallow silently. */
 883                 }
 884         }
 885
 886         @Subscribe
 887         public void replyReceived(ReplyReceived replyReceived) {
 888                 logger.trace(String.format("%s: %s", replyReceived.connection().hostname(), replyReceived.reply()));
 889         }
 890
 891         //
 892         // PRIVATE METHODS
 893         //
 894
 895         /**
 896          * Returns the download of the given pack from the given bot.
 897          *
 898          * @param pack
 899          *              The pack being downloaded
 900          * @param bot
 901          *              The bot the pack is being downloaded from
 902          * @return The download, or {@link Optional#absent()} if the download could not
 903          *         be found
 904          */
 905         private Optional<Download> getDownload(Pack pack, Bot bot) {
 906                 if (!downloads.containsKey(pack.name())) {
 907                         return Optional.absent();
 908                 }
 909                 for (Download download : Lists.newArrayList(downloads.get(pack.name()))) {
 910                         if (download.bot().equals(bot)) {
 911                                 return Optional.of(download);
 912                         }
 913                 }
 914                 return Optional.absent();
 915         }
 916
 917         /**
 918          * Searches all current connections for the given connection, returning the
 919          * associated network.
 920          *
 921          * @param connection
 922          *              The connection to get the network for
 923          * @return The network belonging to the connection, or {@link
 924          *         Optional#absent()}
 925          */
 926         private Optional<Network> getNetwork(Connection connection) {
 927                 for (Entry<Network, Connection> networkConnectionEntry : networkConnections.entrySet()) {
 928                         if (networkConnectionEntry.getValue().equals(connection)) {
 929                                 return Optional.of(networkConnectionEntry.getKey());
 930                         }
 931                 }
 932                 return Optional.absent();
 933         }
 934
 935         /**
 936          * Returns the configured channel for the given network and name.
 937          *
 938          * @param network
 939          *              The network the channel is located on
 940          * @param channelName
 941          *              The name of the channel
 942          * @return The configured channel, or {@link Optional#absent()} if no
 943          *         configured channel matching the given network and name was found
 944          */
 945         public Optional<Channel> getChannel(Network network, String channelName) {
 946                 for (Channel channel : channels) {
 947                         if (channel.network().equals(network) && (channel.name().equalsIgnoreCase(channelName))) {
 948                                 return Optional.of(channel);
 949                         }
 950                 }
 951                 return Optional.absent();
 952         }
 953
 954         /**
 955          * Returns the extra channel for the given network and name.
 956          *
 957          * @param network
 958          *              The network the channel is located on
 959          * @param channelName
 960          *              The name of the channel
 961          * @return The extra channel, or {@link Optional#absent()} if no extra channel
 962          *         matching the given network and name was found
 963          */
 964         public Optional<Channel> getExtraChannel(Network network, String channelName) {
 965                 for (Channel channel : extraChannels) {
 966                         if (channel.network().equals(network) && (channel.name().equalsIgnoreCase(channelName))) {
 967                                 return Optional.of(channel);
 968                         }
 969                 }
 970                 return Optional.absent();
 971         }
 972
 973         /**
 974          * Parses {@link Pack} information from the given message.
 975          *
 976          * @param message
 977          *              The message to parse pack information from
 978          * @return The parsed pack, or {@link Optional#absent()} if the message could
 979          *         not be parsed into a pack
 980          */
 981         private Optional<Pack> parsePack(String message) {
 982                 int squareOpen = message.indexOf('[');
 983                 int squareClose = message.indexOf(']', squareOpen);
 984                 if ((squareOpen == -1) && (squareClose == -1)) {
 985                         return Optional.absent();
 986                 }
 987                 String packSize = message.substring(squareOpen + 1, squareClose);
 988                 String packName = message.substring(message.lastIndexOf(' ') + 1);
 989                 String packIndex = message.substring(0, message.indexOf(' ')).substring(1);
 990                 return Optional.of(new Pack(packIndex, packSize, packName));
 991         }
 992
 993 }