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 java.lang.String.format;
  21 import static net.pterodactylus.irc.util.MessageCleaner.getDefaultInstance;
  22 import static net.pterodactylus.xdcc.data.Channel.TO_NETWORK;
  23 import static net.pterodactylus.xdcc.data.Download.FILTER_RUNNING;
  24
  25 import java.io.File;
  26 import java.io.FileNotFoundException;
  27 import java.io.FileOutputStream;
  28 import java.io.IOException;
  29 import java.io.OutputStream;
  30 import java.util.Collection;
  31 import java.util.Collections;
  32 import java.util.Iterator;
  33 import java.util.List;
  34 import java.util.Map;
  35 import java.util.Map.Entry;
  36 import java.util.concurrent.TimeUnit;
  37
  38 import net.pterodactylus.irc.Connection;
  39 import net.pterodactylus.irc.ConnectionBuilder;
  40 import net.pterodactylus.irc.DccReceiver;
  41 import net.pterodactylus.irc.event.ChannelJoined;
  42 import net.pterodactylus.irc.event.ChannelLeft;
  43 import net.pterodactylus.irc.event.ChannelMessageReceived;
  44 import net.pterodactylus.irc.event.ClientQuit;
  45 import net.pterodactylus.irc.event.ConnectionClosed;
  46 import net.pterodactylus.irc.event.ConnectionEstablished;
  47 import net.pterodactylus.irc.event.ConnectionFailed;
  48 import net.pterodactylus.irc.event.DccAcceptReceived;
  49 import net.pterodactylus.irc.event.DccDownloadFailed;
  50 import net.pterodactylus.irc.event.DccDownloadFinished;
  51 import net.pterodactylus.irc.event.DccSendReceived;
  52 import net.pterodactylus.irc.event.KickedFromChannel;
  53 import net.pterodactylus.irc.event.NicknameChanged;
  54 import net.pterodactylus.irc.event.PrivateMessageReceived;
  55 import net.pterodactylus.irc.event.PrivateNoticeReceived;
  56 import net.pterodactylus.irc.event.ReplyReceived;
  57 import net.pterodactylus.irc.util.RandomNickname;
  58 import net.pterodactylus.xdcc.core.event.BotAdded;
  59 import net.pterodactylus.xdcc.core.event.CoreStarted;
  60 import net.pterodactylus.xdcc.core.event.DownloadFailed;
  61 import net.pterodactylus.xdcc.core.event.DownloadFinished;
  62 import net.pterodactylus.xdcc.core.event.DownloadStarted;
  63 import net.pterodactylus.xdcc.core.event.GenericError;
  64 import net.pterodactylus.xdcc.core.event.GenericMessage;
  65 import net.pterodactylus.xdcc.core.event.MessageReceived;
  66 import net.pterodactylus.xdcc.data.Bot;
  67 import net.pterodactylus.xdcc.data.Channel;
  68 import net.pterodactylus.xdcc.data.Download;
  69 import net.pterodactylus.xdcc.data.Network;
  70 import net.pterodactylus.xdcc.data.Pack;
  71 import net.pterodactylus.xdcc.data.Server;
  72
  73 import com.google.common.base.Function;
  74 import com.google.common.base.Optional;
  75 import com.google.common.base.Predicate;
  76 import com.google.common.collect.FluentIterable;
  77 import com.google.common.collect.HashBasedTable;
  78 import com.google.common.collect.HashMultimap;
  79 import com.google.common.collect.ImmutableList;
  80 import com.google.common.collect.ImmutableSet;
  81 import com.google.common.collect.Lists;
  82 import com.google.common.collect.Maps;
  83 import com.google.common.collect.Multimap;
  84 import com.google.common.collect.Sets;
  85 import com.google.common.collect.Table;
  86 import com.google.common.eventbus.EventBus;
  87 import com.google.common.eventbus.Subscribe;
  88 import com.google.common.io.Closeables;
  89 import com.google.common.util.concurrent.AbstractExecutionThreadService;
  90 import com.google.inject.Inject;
  91 import org.apache.log4j.Logger;
  92
  93 /**
  94  * The core of XDCC Downloader.
  95  *
  96  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  97  */
  98 public class Core extends AbstractExecutionThreadService {
  99
 100         /** The logger. */
 101         private static final Logger logger = Logger.getLogger(Core.class.getName());
 102
 103         /** The event bus. */
 104         private final EventBus eventBus;
 105
 106         /** The temporary directory to download files to. */
 107         private final String temporaryDirectory;
 108
 109         /** The directory to move finished downloads to. */
 110         private final String finalDirectory;
 111
 112         /** The channels that should be monitored. */
 113         private final Collection<Channel> channels = Sets.newHashSet();
 114
 115         /** The channels that are currentlymonitored. */
 116         private final Collection<Channel> joinedChannels = Sets.newHashSet();
 117
 118         /** The channels that are joined but not configured. */
 119         private final Collection<Channel> extraChannels = Sets.newHashSet();
 120
 121         /** The current network connections. */
 122         private final Map<Network, Connection> networkConnections = Collections.synchronizedMap(Maps.<Network, Connection>newHashMap());
 123
 124         /** The currently known bots. */
 125         private final Table<Network, String, Bot> networkBots = HashBasedTable.create();
 126
 127         /** The current downloads. */
 128         private final Multimap<String, Download> downloads = HashMultimap.create();
 129
 130         /** The current DCC receivers. */
 131         private final Collection<DccReceiver> dccReceivers = Lists.newArrayList();
 132
 133         /**
 134          * Creates a new core.
 135          *
 136          * @param eventBus
 137          *              The event bus
 138          * @param temporaryDirectory
 139          *              The directory to download files to
 140          * @param finalDirectory
 141          *              The directory to move finished files to
 142          */
 143         @Inject
 144         public Core(EventBus eventBus, String temporaryDirectory, String finalDirectory) {
 145                 this.eventBus = eventBus;
 146                 this.temporaryDirectory = temporaryDirectory;
 147                 this.finalDirectory = finalDirectory;
 148         }
 149
 150         //
 151         // ACCESSORS
 152         //
 153
 154         /**
 155          * Returns all currently known connections.
 156          *
 157          * @return All currently known connections
 158          */
 159         public Collection<Connection> connections() {
 160                 return networkConnections.values();
 161         }
 162
 163         /**
 164          * Returns all defined networks.
 165          *
 166          * @return All defined networks
 167          */
 168         public Collection<Network> networks() {
 169                 return FluentIterable.from(channels).transform(TO_NETWORK).toSet();
 170         }
 171
 172         /**
 173          * Returns all connected networks.
 174          *
 175          * @return All connected networks
 176          */
 177         public Collection<Network> connectedNetworks() {
 178                 return Lists.newArrayList(Optional.presentInstances(FluentIterable.from(networkConnections.values()).transform(new Function<Connection, Optional<Network>>() {
 179                         @Override
 180                         public Optional<Network> apply(Connection connection) {
 181                                 return getNetwork(connection);
 182                         }
 183                 })));
 184         }
 185
 186         /**
 187          * Returns all configured channels. Due to various circumstances, configured
 188          * channels might not actually be joined.
 189          *
 190          * @return All configured channels
 191          */
 192         public Collection<Channel> channels() {
 193                 return ImmutableSet.copyOf(channels);
 194         }
 195
 196         /**
 197          * Returns all currently joined channels.
 198          *
 199          * @return All currently joined channels
 200          */
 201         public Collection<Channel> joinedChannels() {
 202                 return ImmutableSet.copyOf(joinedChannels);
 203         }
 204
 205         /**
 206          * Returns all currently joined channels that are not configured.
 207          *
 208          * @return All currently joined but not configured channels
 209          */
 210         public Collection<Channel> extraChannels() {
 211                 return ImmutableSet.copyOf(extraChannels);
 212         }
 213
 214         /**
 215          * Returns all currently known bots.
 216          *
 217          * @return All currently known bots
 218          */
 219         public Collection<Bot> bots() {
 220                 return networkBots.values();
 221         }
 222
 223         /**
 224          * Returns all currently running downloads.
 225          *
 226          * @return All currently running downloads
 227          */
 228         public Collection<Download> downloads() {
 229                 return downloads.values();
 230         }
 231
 232         //
 233         // ACTIONS
 234         //
 235
 236         /**
 237          * Adds a channel to monitor.
 238          *
 239          * @param channel
 240          *              The channel to monitor
 241          */
 242         public void addChannel(Channel channel) {
 243                 channels.add(channel);
 244         }
 245
 246         /**
 247          * Fetches the given pack from the given bot.
 248          *
 249          * @param bot
 250          *              The bot to fetch the pack from
 251          * @param pack
 252          *              The pack to fetch
 253          */
 254         public void fetch(Bot bot, Pack pack) {
 255                 Connection connection = networkConnections.get(bot.network());
 256                 if (connection == null) {
 257                         return;
 258                 }
 259
 260                 /* check if we are already downloading the file? */
 261                 if (downloads.containsKey(pack.name())) {
 262                         Collection<Download> packDownloads = downloads.get(pack.name());
 263                         Collection<Download> runningDownloads = FluentIterable.from(packDownloads).filter(FILTER_RUNNING).toSet();
 264                         if (!runningDownloads.isEmpty()) {
 265                                 Download download = runningDownloads.iterator().next();
 266                                 eventBus.post(new GenericMessage(String.format("File %s is already downloading from %s (%s).", pack.name(), download.bot().name(), download.bot().network().name())));
 267                                 return;
 268                         }
 269                         StringBuilder bots = new StringBuilder();
 270                         for (Download download : packDownloads) {
 271                                 if (bots.length() > 0) {
 272                                         bots.append(", ");
 273                                 }
 274                                 bots.append(download.bot().name()).append(" (").append(download.bot().network().name()).append(')');
 275                         }
 276                         eventBus.post(new GenericMessage(String.format("File %s is already requested from %d bots (%s).", pack.name(), packDownloads.size(), bots.toString())));
 277                 }
 278
 279                 Download download = new Download(bot, pack);
 280                 downloads.put(pack.name(), download);
 281
 282                 try {
 283                         connection.sendMessage(bot.name(), "XDCC SEND " + pack.id());
 284                 } catch (IOException ioe1) {
 285                         logger.warn("Could not send message to bot!", ioe1);
 286                 }
 287         }
 288
 289         /**
 290          * Cancels the download of the given pack from the given bot.
 291          *
 292          * @param bot
 293          *              The bot the pack is being downloaded from
 294          * @param pack
 295          *              The pack being downloaded
 296          */
 297         public void cancelDownload(Bot bot, Pack pack) {
 298                 Optional<Download> download = getDownload(pack, bot);
 299                 if (!download.isPresent()) {
 300                         return;
 301                 }
 302
 303                 /* get connection. */
 304                 Connection connection = networkConnections.get(bot.network());
 305                 if (connection == null) {
 306                         /* request for unknown network? */
 307                         return;
 308                 }
 309
 310                 /* stop the DCC receiver. */
 311                 if (download.get().dccReceiver() != null) {
 312                         download.get().dccReceiver().stop();
 313                 } else {
 314                         /* remove download if it hasn’t started yet. */
 315                         downloads.remove(pack.name(), download.get());
 316                 }
 317
 318                 /* remove the request from the bot, too. */
 319                 try {
 320                         connection.sendMessage(bot.name(), String.format("XDCC %s", (download.get().dccReceiver() != null) ? "CANCEL" : "REMOVE"));
 321                 } catch (IOException ioe1) {
 322                         logger.warn(String.format("Could not cancel DCC from %s (%s)!", bot.name(), bot.network().name()), ioe1);
 323                 }
 324         }
 325
 326         /**
 327          * Closes the given connection.
 328          *
 329          * @param connection
 330          *              The connection to close
 331          */
 332         public void closeConnection(Connection connection) {
 333                 try {
 334                         connection.close();
 335                 } catch (IOException ioe1) {
 336                         /* TODO */
 337                 }
 338         }
 339
 340         //
 341         // ABSTRACTIDLESERVICE METHODS
 342         //
 343
 344         @Override
 345         protected void startUp() {
 346                 for (Channel channel : channels) {
 347                         logger.info(String.format("Connecting to Channel %s on Network %s…", channel.name(), channel.network().name()));
 348                         connectNetwork(channel.network());
 349                 }
 350
 351                 /* notify listeners. */
 352                 eventBus.post(new CoreStarted(this));
 353         }
 354
 355         @Override
 356         protected void run() throws Exception {
 357                 while (isRunning()) {
 358                         try {
 359                                 Thread.sleep(TimeUnit.MINUTES.toMillis(1));
 360                         } catch (InterruptedException ie1) {
 361                                 /* ignore. */
 362                         }
 363
 364                         /* find channels that should be monitored but are not. */
 365                         for (Channel channel : channels) {
 366                                 if (joinedChannels.contains(channel)) {
 367                                         continue;
 368                                 }
 369
 370                                 connectNetwork(channel.network());
 371                                 Connection connection = networkConnections.get(channel.network());
 372                                 if (connection.established()) {
 373                                         eventBus.post(new GenericMessage(String.format("Trying to join %s on %s.", channel.name(), channel.network().name())));
 374                                         try {
 375                                                 connection.joinChannel(channel.name());
 376                                         } catch (IOException ioe1) {
 377                                                 eventBus.post(new GenericMessage(String.format("Could not join %s on %s.", channel.name(), channel.network().name())));
 378                                         }
 379                                 }
 380                         }
 381                 }
 382         }
 383
 384         @Override
 385         protected void shutDown() {
 386         }
 387
 388         //
 389         // PRIVATE METHODS
 390         //
 391
 392         /**
 393          * Starts a new connection for the given network if no such connection exists
 394          * already.
 395          *
 396          * @param network
 397          *              The network to connect to
 398          */
 399         private void connectNetwork(Network network) {
 400                 if (!networkConnections.containsKey(network)) {
 401                                 /* select a random server. */
 402                         List<Server> servers = Lists.newArrayList(network.servers());
 403                         if (servers.isEmpty()) {
 404                                 eventBus.post(new GenericError(String.format("Network %s does not have any servers.", network.name())));
 405                                 return;
 406                         }
 407                         Server server = servers.get((int) (Math.random() * servers.size()));
 408                         Connection connection = new ConnectionBuilder(eventBus).connect(server.hostname()).port(server.unencryptedPorts().iterator().next()).build();
 409                         connection.username(RandomNickname.get()).realName(RandomNickname.get());
 410                         networkConnections.put(network, connection);
 411                         connection.start();
 412                 }
 413         }
 414
 415         /**
 416          * Removes the given connection and all its channels and bots.
 417          *
 418          * @param connection
 419          *              The connection to remove
 420          */
 421         private void removeConnection(Connection connection) {
 422                 Optional<Network> network = getNetwork(connection);
 423                 if (!network.isPresent()) {
 424                         return;
 425                 }
 426
 427                 /* find all channels that need to be removed. */
 428                 for (Collection<Channel> channels : ImmutableList.of(joinedChannels, extraChannels)) {
 429                         for (Iterator<Channel> channelIterator = channels.iterator(); channelIterator.hasNext(); ) {
 430                                 Channel joinedChannel = channelIterator.next();
 431                                 if (!joinedChannel.network().equals(network.get())) {
 432                                         continue;
 433                                 }
 434
 435                                 channelIterator.remove();
 436                         }
 437                 }
 438
 439                 /* now remove all bots for that network. */
 440                 Map<String, Bot> bots = networkBots.row(network.get());
 441                 int botCount = bots.size();
 442                 int packCount = 0;
 443                 for (Bot bot : bots.values()) {
 444                         packCount += bot.packs().size();
 445                 }
 446                 bots.clear();
 447                 eventBus.post(new GenericMessage(String.format("Network %s disconnected, %d bots removed, %d packs removed.", network.get().name(), botCount, packCount)));
 448
 449                 /* now remove the network. */
 450                 networkConnections.remove(network.get());
 451         }
 452
 453         //
 454         // EVENT HANDLERS
 455         //
 456
 457         /**
 458          * If a connection to a network has been established, the channels associated
 459          * with this network are joined.
 460          *
 461          * @param connectionEstablished
 462          *              The connection established event
 463          */
 464         @Subscribe
 465         public void connectionEstablished(ConnectionEstablished connectionEstablished) {
 466
 467                 /* get network for connection. */
 468                 Optional<Network> network = getNetwork(connectionEstablished.connection());
 469
 470                 /* found network? */
 471                 if (!network.isPresent()) {
 472                         eventBus.post(new GenericMessage(String.format("Connected to unknown network: %s", connectionEstablished.connection().hostname())));
 473                         return;
 474                 }
 475
 476                 eventBus.post(new GenericMessage(String.format("Connected to network %s.", network.get().name())));
 477
 478                 /* join all channels on this network. */
 479                 for (Channel channel : channels) {
 480                         if (channel.network().equals(network.get())) {
 481                                 try {
 482                                         eventBus.post(new GenericMessage(String.format("Trying to join %s on %s...", channel.name(), network.get().name())));
 483                                         connectionEstablished.connection().joinChannel(channel.name());
 484                                 } catch (IOException ioe1) {
 485                                         logger.warn(String.format("Could not join %s on %s!", channel.name(), network.get().name()), ioe1);
 486                                 }
 487                         }
 488                 }
 489         }
 490
 491         /**
 492          * Remove all data stored for a network if the connection is closed.
 493          *
 494          * @param connectionClosed
 495          *              The connection closed event
 496          */
 497         @Subscribe
 498         public void connectionClosed(ConnectionClosed connectionClosed) {
 499                 removeConnection(connectionClosed.connection());
 500         }
 501
 502         /**
 503          * Remove all data stored for a network if the connection fails.
 504          *
 505          * @param connectionFailed
 506          *              The connection failed event
 507          */
 508         @Subscribe
 509         public void connectionFailed(ConnectionFailed connectionFailed) {
 510                 removeConnection(connectionFailed.connection());
 511         }
 512
 513         /**
 514          * Shows a message when a channel was joined by us.
 515          *
 516          * @param channelJoined
 517          *              The channel joined event
 518          */
 519         @Subscribe
 520         public void channelJoined(ChannelJoined channelJoined) {
 521                 if (channelJoined.connection().isSource(channelJoined.client())) {
 522                         Optional<Network> network = getNetwork(channelJoined.connection());
 523                         if (!network.isPresent()) {
 524                                 return;
 525                         }
 526
 527                         Optional<Channel> channel = getChannel(network.get(), channelJoined.channel());
 528                         if (!channel.isPresent()) {
 529                                 /* it’s an extra channel. */
 530                                 extraChannels.add(new Channel(network.get(), channelJoined.channel()));
 531                                 logger.info(String.format("Joined extra Channel %s on %s.", channelJoined.channel(), network.get().name()));
 532                                 return;
 533                         }
 534
 535                         joinedChannels.add(channel.get());
 536                         logger.info(String.format("Joined Channel %s on %s.", channelJoined.channel(), network.get().name()));
 537                 }
 538         }
 539
 540         /**
 541          * Removes bots that leave a channel, or channels when it’s us that’s leaving.
 542          *
 543          * @param channelLeft
 544          *              The channel left event
 545          */
 546         @Subscribe
 547         public void channelLeft(ChannelLeft channelLeft) {
 548                 Optional<Network> network = getNetwork(channelLeft.connection());
 549                 if (!network.isPresent()) {
 550                         return;
 551                 }
 552
 553                 Bot bot = networkBots.get(network.get(), channelLeft.client().nick().get());
 554                 if (bot == null) {
 555                         /* maybe it was us? */
 556                         if (channelLeft.connection().isSource(channelLeft.client())) {
 557                                 Optional<Channel> channel = getChannel(network.get(), channelLeft.channel());
 558                                 if (!channel.isPresent()) {
 559                                         /* maybe it was an extra channel? */
 560                                         channel = getExtraChannel(network.get(), channelLeft.channel());
 561                                         if (!channel.isPresent()) {
 562                                                 /* okay, whatever. */
 563                                                 return;
 564                                         }
 565
 566                                         extraChannels.remove(channel);
 567                                 } else {
 568                                         channels.remove(channel.get());
 569                                 }
 570
 571                                 eventBus.post(new GenericMessage(String.format("Left Channel %s on %s.", channel.get().name(), channel.get().network().name())));
 572                         }
 573
 574                         return;
 575                 }
 576
 577                 networkBots.remove(network.get(), channelLeft.client().nick().get());
 578         }
 579
 580         @Subscribe
 581         public void kickedFromChannel(KickedFromChannel kickedFromChannel) {
 582                 Optional<Network> network = getNetwork(kickedFromChannel.connection());
 583                 if (!network.isPresent()) {
 584                         return;
 585                 }
 586
 587                 /* have we been kicked? */
 588                 if (nicknameMatchesConnection(kickedFromChannel.connection(), kickedFromChannel.kickee())) {
 589                         eventBus.post(new GenericMessage(format(
 590                                         "Kicked from %s/%s by %s: %s",
 591                                         kickedFromChannel.channel(), network.get(),
 592                                         kickedFromChannel.kicker(),
 593                                         kickedFromChannel.reason().or("<unknown>")
 594                         )));
 595                 }
 596         }
 597
 598         private boolean nicknameMatchesConnection(Connection connection, String nickname) {
 599                 return connection.nickname().equalsIgnoreCase(nickname);
 600         }
 601
 602         /**
 603          * Removes a client (which may be a bot) from the table of known bots.
 604          *
 605          * @param clientQuit
 606          *              The client quit event
 607          */
 608         @Subscribe
 609         public void clientQuit(ClientQuit clientQuit) {
 610                 Optional<Network> network = getNetwork(clientQuit.connection());
 611                 if (!network.isPresent()) {
 612                         return;
 613                 }
 614
 615                 networkBots.remove(network.get(), clientQuit.client().nick().get());
 616         }
 617
 618         /**
 619          * If the nickname of a bit changes, remove it from the old name and store it
 620          * under the new name.
 621          *
 622          * @param nicknameChanged
 623          *              The nickname changed event
 624          */
 625         @Subscribe
 626         public void nicknameChanged(NicknameChanged nicknameChanged) {
 627                 Optional<Network> network = getNetwork(nicknameChanged.connection());
 628                 if (!network.isPresent()) {
 629                         return;
 630                 }
 631
 632                 Bot bot = networkBots.remove(network.get(), nicknameChanged.client().nick().get());
 633                 if (bot == null) {
 634                         return;
 635                 }
 636
 637                 networkBots.put(network.get(), nicknameChanged.newNickname(), bot);
 638         }
 639
 640         /**
 641          * If a message on a channel is received, it is parsed for pack information
 642          * with is then added to a bot.
 643          *
 644          * @param channelMessageReceived
 645          *              The channel message received event
 646          */
 647         @Subscribe
 648         public void channelMessageReceived(ChannelMessageReceived channelMessageReceived) {
 649                 String message = getDefaultInstance().clean(channelMessageReceived.message());
 650                 if (!message.startsWith("#")) {
 651                         /* most probably not a pack announcement. */
 652                         return;
 653                 }
 654
 655                 Optional<Network> network = getNetwork(channelMessageReceived.connection());
 656                 if (!network.isPresent()) {
 657                         /* message for unknown connection? */
 658                         return;
 659                 }
 660
 661                 /* parse pack information. */
 662                 Optional<Pack> pack = parsePack(message);
 663                 if (!pack.isPresent()) {
 664                         return;
 665                 }
 666
 667                 Bot bot;
 668                 synchronized (networkBots) {
 669                         if (!networkBots.contains(network.get(), channelMessageReceived.source().nick().get())) {
 670                                 bot = new Bot(network.get(), channelMessageReceived.source().nick().get());
 671                                 networkBots.put(network.get(), channelMessageReceived.source().nick().get(), bot);
 672                                 eventBus.post(new BotAdded(bot));
 673                         } else {
 674                                 bot = networkBots.get(network.get(), channelMessageReceived.source().nick().get());
 675                         }
 676                 }
 677
 678                 /* add pack. */
 679                 bot.addPack(pack.get());
 680                 logger.debug(String.format("Bot %s now has %d packs.", bot, bot.packs().size()));
 681         }
 682
 683         /**
 684          * Forward all private messages to every console.
 685          *
 686          * @param privateMessageReceived
 687          *              The private message recevied event
 688          */
 689         @Subscribe
 690         public void privateMessageReceived(PrivateMessageReceived privateMessageReceived) {
 691                 eventBus.post(new MessageReceived(privateMessageReceived.source(), privateMessageReceived.message()));
 692         }
 693
 694         /**
 695          * Sends a message to all console when a notice was received.
 696          *
 697          * @param privateNoticeReceived
 698          *              The notice received event
 699          */
 700         @Subscribe
 701         public void privateNoticeReceived(PrivateNoticeReceived privateNoticeReceived) {
 702                 Optional<Network> network = getNetwork(privateNoticeReceived.connection());
 703                 if (!network.isPresent()) {
 704                         return;
 705                 }
 706
 707                 eventBus.post(new GenericMessage(String.format("Notice from %s (%s): %s", privateNoticeReceived.reply().source().get(), network.get(), privateNoticeReceived.text())));
 708         }
 709
 710         /**
 711          * Starts a DCC download.
 712          *
 713          * @param dccSendReceived
 714          *              The DCC SEND event
 715          */
 716         @Subscribe
 717         public void dccSendReceived(final DccSendReceived dccSendReceived) {
 718                 final Optional<Network> network = getNetwork(dccSendReceived.connection());
 719                 if (!network.isPresent()) {
 720                         return;
 721                 }
 722
 723                 Collection<Download> packDownloads = downloads.get(dccSendReceived.filename());
 724                 if (packDownloads.isEmpty()) {
 725                         /* unknown download, ignore. */
 726                         return;
 727                 }
 728
 729                 /* check if it’s already downloading. */
 730                 Collection<Download> runningDownloads = FluentIterable.from(packDownloads).filter(FILTER_RUNNING).toSet();
 731                 if (!runningDownloads.isEmpty()) {
 732                         eventBus.post(new GenericMessage(String.format("Ignoring offer for %s, it’s already being downloaded.", dccSendReceived.filename())));
 733                         return;
 734                 }
 735
 736                 /* locate the correct download. */
 737                 Collection<Download> requestedDownload = FluentIterable.from(packDownloads).filter(new Predicate<Download>() {
 738
 739                         @Override
 740                         public boolean apply(Download download) {
 741                                 return download.bot().network().equals(network.get()) && download.bot().name().equalsIgnoreCase(dccSendReceived.source().nick().get());
 742                         }
 743                 }).toSet();
 744
 745                 /* we did not request this download. */
 746                 if (requestedDownload.isEmpty()) {
 747                         return;
 748                 }
 749
 750                 Download download = requestedDownload.iterator().next();
 751
 752                 /* check if the file already exists. */
 753                 File outputFile = new File(temporaryDirectory, dccSendReceived.filename());
 754                 if (outputFile.exists()) {
 755                         long existingFileSize = outputFile.length();
 756
 757                         /* file already complete? */
 758                         if ((dccSendReceived.filesize() > -1) && (existingFileSize >= dccSendReceived.filesize())) {
 759                                 /* file is apparently already complete. just move it. */
 760                                 if (outputFile.renameTo(new File(finalDirectory, download.pack().name()))) {
 761                                         eventBus.post(new GenericMessage(String.format("File %s already downloaded.", download.pack().name())));
 762                                 } else {
 763                                         eventBus.post(new GenericMessage(String.format("File %s already downloaded but not moved to %s.", download.pack().name(), finalDirectory)));
 764                                 }
 765
 766                                 /* remove download. */
 767                                 downloads.removeAll(download.pack().name());
 768                                 return;
 769                         }
 770
 771                         /* file not complete yet, DCC resume it. */
 772                         try {
 773                                 download.remoteAddress(dccSendReceived.inetAddress()).filesize(dccSendReceived.filesize());
 774                                 dccSendReceived.connection().sendDccResume(dccSendReceived.source().nick().get(), dccSendReceived.filename(), dccSendReceived.port(), existingFileSize);
 775                         } catch (IOException ioe1) {
 776                                 eventBus.post(new GenericError(String.format("Could not send DCC RESUME %s to %s (%s).", dccSendReceived.filename(), dccSendReceived.source().nick().get(), ioe1.getMessage())));
 777                         }
 778
 779                         return;
 780                 }
 781
 782                 /* file does not exist, start the download. */
 783                 try {
 784                         OutputStream fileOutputStream = new FileOutputStream(outputFile);
 785                         DccReceiver dccReceiver = new DccReceiver(eventBus, dccSendReceived.inetAddress(), dccSendReceived.port(), dccSendReceived.filename(), dccSendReceived.filesize(), fileOutputStream);
 786                         download.filename(outputFile.getPath()).outputStream(fileOutputStream).dccReceiver(dccReceiver);
 787                         dccReceivers.add(dccReceiver);
 788                         dccReceiver.start();
 789                         eventBus.post(new DownloadStarted(download));
 790                 } catch (FileNotFoundException fnfe1) {
 791                         eventBus.post(new GenericError(String.format("Could not start download of %s from %s (%s).", dccSendReceived.filename(), dccSendReceived.source().nick().get(), fnfe1.getMessage())));
 792                 }
 793         }
 794
 795         @Subscribe
 796         public void dccAcceptReceived(final DccAcceptReceived dccAcceptReceived) {
 797                 final Optional<Network> network = getNetwork(dccAcceptReceived.connection());
 798                 if (!network.isPresent()) {
 799                         return;
 800                 }
 801
 802                 Collection<Download> packDownloads = downloads.get(dccAcceptReceived.filename());
 803                 if (packDownloads.isEmpty()) {
 804                         /* unknown download, ignore. */
 805                         return;
 806                 }
 807
 808                 /* check if it’s already downloading. */
 809                 Collection<Download> runningDownloads = FluentIterable.from(packDownloads).filter(FILTER_RUNNING).toSet();
 810                 if (!runningDownloads.isEmpty()) {
 811                         eventBus.post(new GenericMessage(String.format("Ignoring offer for %s, it’s already being downloaded.", dccAcceptReceived.filename())));
 812                         return;
 813                 }
 814
 815                 /* locate the correct download. */
 816                 Collection<Download> requestedDownload = FluentIterable.from(packDownloads).filter(new Predicate<Download>() {
 817
 818                         @Override
 819                         public boolean apply(Download download) {
 820                                 return download.bot().network().equals(network.get()) && download.bot().name().equalsIgnoreCase(dccAcceptReceived.source().nick().get());
 821                         }
 822                 }).toSet();
 823
 824                 /* we did not request this download. */
 825                 if (requestedDownload.isEmpty()) {
 826                         return;
 827                 }
 828
 829                 Download download = requestedDownload.iterator().next();
 830
 831                 try {
 832                         File outputFile = new File(temporaryDirectory, dccAcceptReceived.filename());
 833                         if (outputFile.length() != dccAcceptReceived.position()) {
 834                                 eventBus.post(new GenericError(String.format("Download %s from %s does not start at the right position!")));
 835                                 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()));
 836
 837                                 downloads.removeAll(download.pack().name());
 838                                 return;
 839                         }
 840                         OutputStream outputStream = new FileOutputStream(outputFile, true);
 841                         DccReceiver dccReceiver = new DccReceiver(eventBus, download.remoteAddress(), dccAcceptReceived.port(), dccAcceptReceived.filename(), dccAcceptReceived.position(), download.filesize(), outputStream);
 842                         download.filename(outputFile.getPath()).outputStream(outputStream).dccReceiver(dccReceiver);
 843                         dccReceivers.add(dccReceiver);
 844                         dccReceiver.start();
 845                         eventBus.post(new DownloadStarted(download));
 846                 } catch (FileNotFoundException fnfe1) {
 847                 }
 848         }
 849
 850         /**
 851          * Closes the output stream of the download and moves the file to the final
 852          * location.
 853          *
 854          * @param dccDownloadFinished
 855          *              The DCC download finished event
 856          */
 857         @Subscribe
 858         public void dccDownloadFinished(DccDownloadFinished dccDownloadFinished) {
 859
 860                 /* locate the correct download. */
 861                 Collection<Download> requestedDownload = FluentIterable.from(downloads.get(dccDownloadFinished.dccReceiver().filename())).filter(FILTER_RUNNING).toSet();
 862                 if (requestedDownload.isEmpty()) {
 863                         /* this seems wrong. */
 864                         logger.warn("Download finished but could not be located.");
 865                         return;
 866                 }
 867                 Download download = requestedDownload.iterator().next();
 868
 869                 try {
 870                         download.outputStream().close();
 871                         File file = new File(download.filename());
 872                         file.renameTo(new File(finalDirectory, download.pack().name()));
 873                         eventBus.post(new DownloadFinished(download));
 874                         dccReceivers.remove(dccDownloadFinished.dccReceiver());
 875                         downloads.removeAll(download.pack().name());
 876                 } catch (IOException ioe1) {
 877                         /* TODO - handle all the errors. */
 878                         logger.warn(String.format("Could not move file %s to directory %s.", download.filename(), finalDirectory), ioe1);
 879                 }
 880         }
 881
 882         /**
 883          * Closes the output stream and notifies all listeners of the failure.
 884          *
 885          * @param dccDownloadFailed
 886          *              The DCC download failed event
 887          */
 888         @Subscribe
 889         public void dccDownloadFailed(DccDownloadFailed dccDownloadFailed) {
 890
 891                 /* locate the correct download. */
 892                 Collection<Download> requestedDownload = FluentIterable.from(downloads.get(dccDownloadFailed.dccReceiver().filename())).filter(FILTER_RUNNING).toSet();
 893                 if (requestedDownload.isEmpty()) {
 894                         /* this seems wrong. */
 895                         logger.warn("Download finished but could not be located.");
 896                         return;
 897                 }
 898                 Download download = requestedDownload.iterator().next();
 899
 900                 try {
 901                         Closeables.close(download.outputStream(), true);
 902                         eventBus.post(new DownloadFailed(download));
 903                         dccReceivers.remove(dccDownloadFailed.dccReceiver());
 904                         downloads.removeAll(download.pack().name());
 905                 } catch (IOException ioe1) {
 906                         /* swallow silently. */
 907                 }
 908         }
 909
 910         @Subscribe
 911         public void replyReceived(ReplyReceived replyReceived) {
 912                 logger.trace(String.format("%s: %s", replyReceived.connection().hostname(), replyReceived.reply()));
 913         }
 914
 915         //
 916         // PRIVATE METHODS
 917         //
 918
 919         /**
 920          * Returns the download of the given pack from the given bot.
 921          *
 922          * @param pack
 923          *              The pack being downloaded
 924          * @param bot
 925          *              The bot the pack is being downloaded from
 926          * @return The download, or {@link Optional#absent()} if the download could not
 927          *         be found
 928          */
 929         private Optional<Download> getDownload(Pack pack, Bot bot) {
 930                 if (!downloads.containsKey(pack.name())) {
 931                         return Optional.absent();
 932                 }
 933                 for (Download download : Lists.newArrayList(downloads.get(pack.name()))) {
 934                         if (download.bot().equals(bot)) {
 935                                 return Optional.of(download);
 936                         }
 937                 }
 938                 return Optional.absent();
 939         }
 940
 941         /**
 942          * Searches all current connections for the given connection, returning the
 943          * associated network.
 944          *
 945          * @param connection
 946          *              The connection to get the network for
 947          * @return The network belonging to the connection, or {@link
 948          *         Optional#absent()}
 949          */
 950         private Optional<Network> getNetwork(Connection connection) {
 951                 for (Entry<Network, Connection> networkConnectionEntry : networkConnections.entrySet()) {
 952                         if (networkConnectionEntry.getValue().equals(connection)) {
 953                                 return Optional.of(networkConnectionEntry.getKey());
 954                         }
 955                 }
 956                 return Optional.absent();
 957         }
 958
 959         /**
 960          * Returns the configured channel for the given network and name.
 961          *
 962          * @param network
 963          *              The network the channel is located on
 964          * @param channelName
 965          *              The name of the channel
 966          * @return The configured channel, or {@link Optional#absent()} if no
 967          *         configured channel matching the given network and name was found
 968          */
 969         public Optional<Channel> getChannel(Network network, String channelName) {
 970                 for (Channel channel : channels) {
 971                         if (channel.network().equals(network) && (channel.name().equalsIgnoreCase(channelName))) {
 972                                 return Optional.of(channel);
 973                         }
 974                 }
 975                 return Optional.absent();
 976         }
 977
 978         /**
 979          * Returns the extra channel for the given network and name.
 980          *
 981          * @param network
 982          *              The network the channel is located on
 983          * @param channelName
 984          *              The name of the channel
 985          * @return The extra channel, or {@link Optional#absent()} if no extra channel
 986          *         matching the given network and name was found
 987          */
 988         public Optional<Channel> getExtraChannel(Network network, String channelName) {
 989                 for (Channel channel : extraChannels) {
 990                         if (channel.network().equals(network) && (channel.name().equalsIgnoreCase(channelName))) {
 991                                 return Optional.of(channel);
 992                         }
 993                 }
 994                 return Optional.absent();
 995         }
 996
 997         /**
 998          * Parses {@link Pack} information from the given message.
 999          *
1000          * @param message
1001          *              The message to parse pack information from
1002          * @return The parsed pack, or {@link Optional#absent()} if the message could
1003          *         not be parsed into a pack
1004          */
1005         private Optional<Pack> parsePack(String message) {
1006                 int squareOpen = message.indexOf('[');
1007                 int squareClose = message.indexOf(']', squareOpen);
1008                 if ((squareOpen == -1) && (squareClose == -1)) {
1009                         return Optional.absent();
1010                 }
1011                 String packSize = message.substring(squareOpen + 1, squareClose);
1012                 String packName = message.substring(message.lastIndexOf(' ') + 1);
1013                 String packIndex = message.substring(0, message.indexOf(' ')).substring(1);
1014                 return Optional.of(new Pack(packIndex, packSize, packName));
1015         }
1016
1017 }