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.ChannelNotJoined;
  45 import net.pterodactylus.irc.event.ClientQuit;
  46 import net.pterodactylus.irc.event.ConnectionClosed;
  47 import net.pterodactylus.irc.event.ConnectionEstablished;
  48 import net.pterodactylus.irc.event.ConnectionFailed;
  49 import net.pterodactylus.irc.event.DccAcceptReceived;
  50 import net.pterodactylus.irc.event.DccDownloadFailed;
  51 import net.pterodactylus.irc.event.DccDownloadFinished;
  52 import net.pterodactylus.irc.event.DccSendReceived;
  53 import net.pterodactylus.irc.event.KickedFromChannel;
  54 import net.pterodactylus.irc.event.NicknameChanged;
  55 import net.pterodactylus.irc.event.PrivateMessageReceived;
  56 import net.pterodactylus.irc.event.PrivateNoticeReceived;
  57 import net.pterodactylus.irc.event.ReplyReceived;
  58 import net.pterodactylus.irc.util.RandomNickname;
  59 import net.pterodactylus.xdcc.core.event.BotAdded;
  60 import net.pterodactylus.xdcc.core.event.CoreStarted;
  61 import net.pterodactylus.xdcc.core.event.DownloadFailed;
  62 import net.pterodactylus.xdcc.core.event.DownloadFinished;
  63 import net.pterodactylus.xdcc.core.event.DownloadStarted;
  64 import net.pterodactylus.xdcc.core.event.GenericError;
  65 import net.pterodactylus.xdcc.core.event.GenericMessage;
  66 import net.pterodactylus.xdcc.core.event.MessageReceived;
  67 import net.pterodactylus.xdcc.data.Bot;
  68 import net.pterodactylus.xdcc.data.Channel;
  69 import net.pterodactylus.xdcc.data.Download;
  70 import net.pterodactylus.xdcc.data.Network;
  71 import net.pterodactylus.xdcc.data.Pack;
  72 import net.pterodactylus.xdcc.data.Server;
  73
  74 import com.google.common.base.Function;
  75 import com.google.common.base.Optional;
  76 import com.google.common.base.Predicate;
  77 import com.google.common.collect.FluentIterable;
  78 import com.google.common.collect.HashBasedTable;
  79 import com.google.common.collect.HashMultimap;
  80 import com.google.common.collect.ImmutableList;
  81 import com.google.common.collect.ImmutableSet;
  82 import com.google.common.collect.Lists;
  83 import com.google.common.collect.Maps;
  84 import com.google.common.collect.Multimap;
  85 import com.google.common.collect.Sets;
  86 import com.google.common.collect.Table;
  87 import com.google.common.eventbus.EventBus;
  88 import com.google.common.eventbus.Subscribe;
  89 import com.google.common.io.Closeables;
  90 import com.google.common.util.concurrent.AbstractExecutionThreadService;
  91 import com.google.inject.Inject;
  92 import org.apache.log4j.Logger;
  93
  94 /**
  95  * The core of XDCC Downloader.
  96  *
  97  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  98  */
  99 public class Core extends AbstractExecutionThreadService {
 100
 101         /** The logger. */
 102         private static final Logger logger = Logger.getLogger(Core.class.getName());
 103
 104         /** The event bus. */
 105         private final EventBus eventBus;
 106
 107         /** The temporary directory to download files to. */
 108         private final String temporaryDirectory;
 109
 110         /** The directory to move finished downloads to. */
 111         private final String finalDirectory;
 112
 113         /** The channels that should be monitored. */
 114         private final Collection<Channel> channels = Sets.newHashSet();
 115
 116         /** The channels that are currentlymonitored. */
 117         private final Collection<Channel> joinedChannels = Sets.newHashSet();
 118
 119         /** The channels that are joined but not configured. */
 120         private final Collection<Channel> extraChannels = Sets.newHashSet();
 121
 122         /** The current network connections. */
 123         private final Map<Network, Connection> networkConnections = Collections.synchronizedMap(Maps.<Network, Connection>newHashMap());
 124
 125         /** The currently known bots. */
 126         private final Table<Network, String, Bot> networkBots = HashBasedTable.create();
 127
 128         /** The current downloads. */
 129         private final Multimap<String, Download> downloads = HashMultimap.create();
 130
 131         /** The current DCC receivers. */
 132         private final Collection<DccReceiver> dccReceivers = Lists.newArrayList();
 133
 134         /**
 135          * Creates a new core.
 136          *
 137          * @param eventBus
 138          *              The event bus
 139          * @param temporaryDirectory
 140          *              The directory to download files to
 141          * @param finalDirectory
 142          *              The directory to move finished files to
 143          */
 144         @Inject
 145         public Core(EventBus eventBus, String temporaryDirectory, String finalDirectory) {
 146                 this.eventBus = eventBus;
 147                 this.temporaryDirectory = temporaryDirectory;
 148                 this.finalDirectory = finalDirectory;
 149         }
 150
 151         //
 152         // ACCESSORS
 153         //
 154
 155         /**
 156          * Returns all currently known connections.
 157          *
 158          * @return All currently known connections
 159          */
 160         public Collection<Connection> connections() {
 161                 return networkConnections.values();
 162         }
 163
 164         /**
 165          * Returns all defined networks.
 166          *
 167          * @return All defined networks
 168          */
 169         public Collection<Network> networks() {
 170                 return FluentIterable.from(channels).transform(TO_NETWORK).toSet();
 171         }
 172
 173         /**
 174          * Returns all connected networks.
 175          *
 176          * @return All connected networks
 177          */
 178         public Collection<Network> connectedNetworks() {
 179                 return Lists.newArrayList(Optional.presentInstances(FluentIterable.from(networkConnections.values()).transform(new Function<Connection, Optional<Network>>() {
 180                         @Override
 181                         public Optional<Network> apply(Connection connection) {
 182                                 return getNetwork(connection);
 183                         }
 184                 })));
 185         }
 186
 187         /**
 188          * Returns all configured channels. Due to various circumstances, configured
 189          * channels might not actually be joined.
 190          *
 191          * @return All configured channels
 192          */
 193         public Collection<Channel> channels() {
 194                 return ImmutableSet.copyOf(channels);
 195         }
 196
 197         /**
 198          * Returns all currently joined channels.
 199          *
 200          * @return All currently joined channels
 201          */
 202         public Collection<Channel> joinedChannels() {
 203                 return ImmutableSet.copyOf(joinedChannels);
 204         }
 205
 206         /**
 207          * Returns all currently joined channels that are not configured.
 208          *
 209          * @return All currently joined but not configured channels
 210          */
 211         public Collection<Channel> extraChannels() {
 212                 return ImmutableSet.copyOf(extraChannels);
 213         }
 214
 215         /**
 216          * Returns all currently known bots.
 217          *
 218          * @return All currently known bots
 219          */
 220         public Collection<Bot> bots() {
 221                 return networkBots.values();
 222         }
 223
 224         /**
 225          * Returns all currently running downloads.
 226          *
 227          * @return All currently running downloads
 228          */
 229         public Collection<Download> downloads() {
 230                 return downloads.values();
 231         }
 232
 233         //
 234         // ACTIONS
 235         //
 236
 237         /**
 238          * Adds a channel to monitor.
 239          *
 240          * @param channel
 241          *              The channel to monitor
 242          */
 243         public void addChannel(Channel channel) {
 244                 channels.add(channel);
 245         }
 246
 247         /**
 248          * Fetches the given pack from the given bot.
 249          *
 250          * @param bot
 251          *              The bot to fetch the pack from
 252          * @param pack
 253          *              The pack to fetch
 254          */
 255         public void fetch(Bot bot, Pack pack) {
 256                 Connection connection = networkConnections.get(bot.network());
 257                 if (connection == null) {
 258                         return;
 259                 }
 260
 261                 /* check if we are already downloading the file? */
 262                 if (downloads.containsKey(pack.name())) {
 263                         Collection<Download> packDownloads = downloads.get(pack.name());
 264                         Collection<Download> runningDownloads = FluentIterable.from(packDownloads).filter(FILTER_RUNNING).toSet();
 265                         if (!runningDownloads.isEmpty()) {
 266                                 Download download = runningDownloads.iterator().next();
 267                                 eventBus.post(new GenericMessage(String.format("File %s is already downloading from %s (%s).", pack.name(), download.bot().name(), download.bot().network().name())));
 268                                 return;
 269                         }
 270                         StringBuilder bots = new StringBuilder();
 271                         for (Download download : packDownloads) {
 272                                 if (bots.length() > 0) {
 273                                         bots.append(", ");
 274                                 }
 275                                 bots.append(download.bot().name()).append(" (").append(download.bot().network().name()).append(')');
 276                         }
 277                         eventBus.post(new GenericMessage(String.format("File %s is already requested from %d bots (%s).", pack.name(), packDownloads.size(), bots.toString())));
 278                 }
 279
 280                 Download download = new Download(bot, pack);
 281                 downloads.put(pack.name(), download);
 282
 283                 try {
 284                         connection.sendMessage(bot.name(), "XDCC SEND " + pack.id());
 285                 } catch (IOException ioe1) {
 286                         logger.warn("Could not send message to bot!", ioe1);
 287                 }
 288         }
 289
 290         /**
 291          * Cancels the download of the given pack from the given bot.
 292          *
 293          * @param bot
 294          *              The bot the pack is being downloaded from
 295          * @param pack
 296          *              The pack being downloaded
 297          */
 298         public void cancelDownload(Bot bot, Pack pack) {
 299                 Optional<Download> download = getDownload(pack, bot);
 300                 if (!download.isPresent()) {
 301                         return;
 302                 }
 303
 304                 /* get connection. */
 305                 Connection connection = networkConnections.get(bot.network());
 306                 if (connection == null) {
 307                         /* request for unknown network? */
 308                         return;
 309                 }
 310
 311                 /* stop the DCC receiver. */
 312                 if (download.get().dccReceiver() != null) {
 313                         download.get().dccReceiver().stop();
 314                 } else {
 315                         /* remove download if it hasn’t started yet. */
 316                         downloads.remove(pack.name(), download.get());
 317                 }
 318
 319                 /* remove the request from the bot, too. */
 320                 try {
 321                         connection.sendMessage(bot.name(), String.format("XDCC %s", (download.get().dccReceiver() != null) ? "CANCEL" : "REMOVE"));
 322                 } catch (IOException ioe1) {
 323                         logger.warn(String.format("Could not cancel DCC from %s (%s)!", bot.name(), bot.network().name()), ioe1);
 324                 }
 325         }
 326
 327         /**
 328          * Closes the given connection.
 329          *
 330          * @param connection
 331          *              The connection to close
 332          */
 333         public void closeConnection(Connection connection) {
 334                 try {
 335                         connection.close();
 336                 } catch (IOException ioe1) {
 337                         /* TODO */
 338                 }
 339         }
 340
 341         //
 342         // ABSTRACTIDLESERVICE METHODS
 343         //
 344
 345         @Override
 346         protected void startUp() {
 347                 for (Channel channel : channels) {
 348                         logger.info(String.format("Connecting to Channel %s on Network %s…", channel.name(), channel.network().name()));
 349                         connectNetwork(channel.network());
 350                 }
 351
 352                 /* notify listeners. */
 353                 eventBus.post(new CoreStarted(this));
 354         }
 355
 356         @Override
 357         protected void run() throws Exception {
 358                 while (isRunning()) {
 359                         try {
 360                                 Thread.sleep(TimeUnit.MINUTES.toMillis(1));
 361                         } catch (InterruptedException ie1) {
 362                                 /* ignore. */
 363                         }
 364
 365                         /* find channels that should be monitored but are not. */
 366                         for (Channel channel : channels) {
 367                                 if (joinedChannels.contains(channel)) {
 368                                         continue;
 369                                 }
 370
 371                                 connectNetwork(channel.network());
 372                                 Connection connection = networkConnections.get(channel.network());
 373                                 if (connection.established()) {
 374                                         eventBus.post(new GenericMessage(String.format("Trying to join %s on %s.", channel.name(), channel.network().name())));
 375                                         try {
 376                                                 connection.joinChannel(channel.name());
 377                                         } catch (IOException ioe1) {
 378                                                 eventBus.post(new GenericMessage(String.format("Could not join %s on %s.", channel.name(), channel.network().name())));
 379                                         }
 380                                 }
 381                         }
 382                 }
 383         }
 384
 385         @Override
 386         protected void shutDown() {
 387         }
 388
 389         //
 390         // PRIVATE METHODS
 391         //
 392
 393         /**
 394          * Starts a new connection for the given network if no such connection exists
 395          * already.
 396          *
 397          * @param network
 398          *              The network to connect to
 399          */
 400         private void connectNetwork(Network network) {
 401                 if (!networkConnections.containsKey(network)) {
 402                                 /* select a random server. */
 403                         List<Server> servers = Lists.newArrayList(network.servers());
 404                         if (servers.isEmpty()) {
 405                                 eventBus.post(new GenericError(String.format("Network %s does not have any servers.", network.name())));
 406                                 return;
 407                         }
 408                         Server server = servers.get((int) (Math.random() * servers.size()));
 409                         Connection connection = new ConnectionBuilder(eventBus).connect(server.hostname()).port(server.unencryptedPorts().iterator().next()).build();
 410                         connection.username(RandomNickname.get()).realName(RandomNickname.get());
 411                         networkConnections.put(network, connection);
 412                         connection.start();
 413                 }
 414         }
 415
 416         /**
 417          * Removes the given connection and all its channels and bots.
 418          *
 419          * @param connection
 420          *              The connection to remove
 421          */
 422         private void removeConnection(Connection connection) {
 423                 Optional<Network> network = getNetwork(connection);
 424                 if (!network.isPresent()) {
 425                         return;
 426                 }
 427
 428                 /* find all channels that need to be removed. */
 429                 for (Collection<Channel> channels : ImmutableList.of(joinedChannels, extraChannels)) {
 430                         for (Iterator<Channel> channelIterator = channels.iterator(); channelIterator.hasNext(); ) {
 431                                 Channel joinedChannel = channelIterator.next();
 432                                 if (!joinedChannel.network().equals(network.get())) {
 433                                         continue;
 434                                 }
 435
 436                                 channelIterator.remove();
 437                         }
 438                 }
 439
 440                 /* now remove all bots for that network. */
 441                 Map<String, Bot> bots = networkBots.row(network.get());
 442                 int botCount = bots.size();
 443                 int packCount = 0;
 444                 for (Bot bot : bots.values()) {
 445                         packCount += bot.packs().size();
 446                 }
 447                 bots.clear();
 448                 eventBus.post(new GenericMessage(String.format("Network %s disconnected, %d bots removed, %d packs removed.", network.get().name(), botCount, packCount)));
 449
 450                 /* now remove the network. */
 451                 networkConnections.remove(network.get());
 452         }
 453
 454         //
 455         // EVENT HANDLERS
 456         //
 457
 458         /**
 459          * If a connection to a network has been established, the channels associated
 460          * with this network are joined.
 461          *
 462          * @param connectionEstablished
 463          *              The connection established event
 464          */
 465         @Subscribe
 466         public void connectionEstablished(ConnectionEstablished connectionEstablished) {
 467
 468                 /* get network for connection. */
 469                 Optional<Network> network = getNetwork(connectionEstablished.connection());
 470
 471                 /* found network? */
 472                 if (!network.isPresent()) {
 473                         eventBus.post(new GenericMessage(String.format("Connected to unknown network: %s", connectionEstablished.connection().hostname())));
 474                         return;
 475                 }
 476
 477                 eventBus.post(new GenericMessage(String.format("Connected to network %s.", network.get().name())));
 478
 479                 /* join all channels on this network. */
 480                 for (Channel channel : channels) {
 481                         if (channel.network().equals(network.get())) {
 482                                 try {
 483                                         eventBus.post(new GenericMessage(String.format("Trying to join %s on %s...", channel.name(), network.get().name())));
 484                                         connectionEstablished.connection().joinChannel(channel.name());
 485                                 } catch (IOException ioe1) {
 486                                         logger.warn(String.format("Could not join %s on %s!", channel.name(), network.get().name()), ioe1);
 487                                 }
 488                         }
 489                 }
 490         }
 491
 492         /**
 493          * Remove all data stored for a network if the connection is closed.
 494          *
 495          * @param connectionClosed
 496          *              The connection closed event
 497          */
 498         @Subscribe
 499         public void connectionClosed(ConnectionClosed connectionClosed) {
 500                 removeConnection(connectionClosed.connection());
 501         }
 502
 503         /**
 504          * Remove all data stored for a network if the connection fails.
 505          *
 506          * @param connectionFailed
 507          *              The connection failed event
 508          */
 509         @Subscribe
 510         public void connectionFailed(ConnectionFailed connectionFailed) {
 511                 removeConnection(connectionFailed.connection());
 512         }
 513
 514         /**
 515          * Shows a message when a channel was joined by us.
 516          *
 517          * @param channelJoined
 518          *              The channel joined event
 519          */
 520         @Subscribe
 521         public void channelJoined(ChannelJoined channelJoined) {
 522                 if (channelJoined.connection().isSource(channelJoined.client())) {
 523                         Optional<Network> network = getNetwork(channelJoined.connection());
 524                         if (!network.isPresent()) {
 525                                 return;
 526                         }
 527
 528                         Optional<Channel> channel = getChannel(network.get(), channelJoined.channel());
 529                         if (!channel.isPresent()) {
 530                                 /* it’s an extra channel. */
 531                                 extraChannels.add(new Channel(network.get(), channelJoined.channel()));
 532                                 logger.info(String.format("Joined extra Channel %s on %s.", channelJoined.channel(), network.get().name()));
 533                                 return;
 534                         }
 535
 536                         joinedChannels.add(channel.get());
 537                         logger.info(String.format("Joined Channel %s on %s.", channelJoined.channel(), network.get().name()));
 538                 }
 539         }
 540
 541         @Subscribe
 542         public void channelNotJoined(ChannelNotJoined channelNotJoined) {
 543                 Optional<Network> network = getNetwork(channelNotJoined.connection());
 544                 if (!network.isPresent()) {
 545                         return;
 546                 }
 547
 548                 eventBus.post(new GenericMessage(
 549                                 format("Could not join %s/%s: %s", channelNotJoined.channel(),
 550                                                 network.get(), channelNotJoined.reason())));
 551         }
 552
 553         /**
 554          * Removes bots that leave a channel, or channels when it’s us that’s leaving.
 555          *
 556          * @param channelLeft
 557          *              The channel left event
 558          */
 559         @Subscribe
 560         public void channelLeft(ChannelLeft channelLeft) {
 561                 Optional<Network> network = getNetwork(channelLeft.connection());
 562                 if (!network.isPresent()) {
 563                         return;
 564                 }
 565
 566                 Bot bot = networkBots.get(network.get(), channelLeft.client().nick().get());
 567                 if (bot == null) {
 568                         /* maybe it was us? */
 569                         if (channelLeft.connection().isSource(channelLeft.client())) {
 570                                 Optional<Channel> channel = getChannel(network.get(), channelLeft.channel());
 571                                 if (!channel.isPresent()) {
 572                                         /* maybe it was an extra channel? */
 573                                         channel = getExtraChannel(network.get(), channelLeft.channel());
 574                                         if (!channel.isPresent()) {
 575                                                 /* okay, whatever. */
 576                                                 return;
 577                                         }
 578
 579                                         extraChannels.remove(channel);
 580                                 } else {
 581                                         channels.remove(channel.get());
 582                                 }
 583
 584                                 eventBus.post(new GenericMessage(String.format("Left Channel %s on %s.", channel.get().name(), channel.get().network().name())));
 585                         }
 586
 587                         return;
 588                 }
 589
 590                 networkBots.remove(network.get(), channelLeft.client().nick().get());
 591         }
 592
 593         @Subscribe
 594         public void kickedFromChannel(KickedFromChannel kickedFromChannel) {
 595                 Optional<Network> network = getNetwork(kickedFromChannel.connection());
 596                 if (!network.isPresent()) {
 597                         return;
 598                 }
 599
 600                 /* have we been kicked? */
 601                 if (nicknameMatchesConnection(kickedFromChannel.connection(), kickedFromChannel.kickee())) {
 602                         eventBus.post(new GenericMessage(format(
 603                                         "Kicked from %s/%s by %s: %s",
 604                                         kickedFromChannel.channel(), network.get(),
 605                                         kickedFromChannel.kicker(),
 606                                         kickedFromChannel.reason().or("<unknown>")
 607                         )));
 608                 }
 609         }
 610
 611         private boolean nicknameMatchesConnection(Connection connection, String nickname) {
 612                 return connection.nickname().equalsIgnoreCase(nickname);
 613         }
 614
 615         /**
 616          * Removes a client (which may be a bot) from the table of known bots.
 617          *
 618          * @param clientQuit
 619          *              The client quit event
 620          */
 621         @Subscribe
 622         public void clientQuit(ClientQuit clientQuit) {
 623                 Optional<Network> network = getNetwork(clientQuit.connection());
 624                 if (!network.isPresent()) {
 625                         return;
 626                 }
 627
 628                 networkBots.remove(network.get(), clientQuit.client().nick().get());
 629         }
 630
 631         /**
 632          * If the nickname of a bit changes, remove it from the old name and store it
 633          * under the new name.
 634          *
 635          * @param nicknameChanged
 636          *              The nickname changed event
 637          */
 638         @Subscribe
 639         public void nicknameChanged(NicknameChanged nicknameChanged) {
 640                 Optional<Network> network = getNetwork(nicknameChanged.connection());
 641                 if (!network.isPresent()) {
 642                         return;
 643                 }
 644
 645                 Bot bot = networkBots.remove(network.get(), nicknameChanged.client().nick().get());
 646                 if (bot == null) {
 647                         return;
 648                 }
 649
 650                 networkBots.put(network.get(), nicknameChanged.newNickname(), bot);
 651         }
 652
 653         /**
 654          * If a message on a channel is received, it is parsed for pack information
 655          * with is then added to a bot.
 656          *
 657          * @param channelMessageReceived
 658          *              The channel message received event
 659          */
 660         @Subscribe
 661         public void channelMessageReceived(ChannelMessageReceived channelMessageReceived) {
 662                 String message = getDefaultInstance().clean(channelMessageReceived.message());
 663                 if (!message.startsWith("#")) {
 664                         /* most probably not a pack announcement. */
 665                         return;
 666                 }
 667
 668                 Optional<Network> network = getNetwork(channelMessageReceived.connection());
 669                 if (!network.isPresent()) {
 670                         /* message for unknown connection? */
 671                         return;
 672                 }
 673
 674                 /* parse pack information. */
 675                 Optional<Pack> pack = parsePack(message);
 676                 if (!pack.isPresent()) {
 677                         return;
 678                 }
 679
 680                 Bot bot;
 681                 synchronized (networkBots) {
 682                         if (!networkBots.contains(network.get(), channelMessageReceived.source().nick().get())) {
 683                                 bot = new Bot(network.get(), channelMessageReceived.source().nick().get());
 684                                 networkBots.put(network.get(), channelMessageReceived.source().nick().get(), bot);
 685                                 eventBus.post(new BotAdded(bot));
 686                         } else {
 687                                 bot = networkBots.get(network.get(), channelMessageReceived.source().nick().get());
 688                         }
 689                 }
 690
 691                 /* add pack. */
 692                 bot.addPack(pack.get());
 693                 logger.debug(String.format("Bot %s now has %d packs.", bot, bot.packs().size()));
 694         }
 695
 696         /**
 697          * Forward all private messages to every console.
 698          *
 699          * @param privateMessageReceived
 700          *              The private message recevied event
 701          */
 702         @Subscribe
 703         public void privateMessageReceived(PrivateMessageReceived privateMessageReceived) {
 704                 eventBus.post(new MessageReceived(privateMessageReceived.source(), privateMessageReceived.message()));
 705         }
 706
 707         /**
 708          * Sends a message to all console when a notice was received.
 709          *
 710          * @param privateNoticeReceived
 711          *              The notice received event
 712          */
 713         @Subscribe
 714         public void privateNoticeReceived(PrivateNoticeReceived privateNoticeReceived) {
 715                 Optional<Network> network = getNetwork(privateNoticeReceived.connection());
 716                 if (!network.isPresent()) {
 717                         return;
 718                 }
 719
 720                 eventBus.post(new GenericMessage(String.format("Notice from %s (%s): %s", privateNoticeReceived.reply().source().get(), network.get(), privateNoticeReceived.text())));
 721         }
 722
 723         /**
 724          * Starts a DCC download.
 725          *
 726          * @param dccSendReceived
 727          *              The DCC SEND event
 728          */
 729         @Subscribe
 730         public void dccSendReceived(final DccSendReceived dccSendReceived) {
 731                 final Optional<Network> network = getNetwork(dccSendReceived.connection());
 732                 if (!network.isPresent()) {
 733                         return;
 734                 }
 735
 736                 Collection<Download> packDownloads = downloads.get(dccSendReceived.filename());
 737                 if (packDownloads.isEmpty()) {
 738                         /* unknown download, ignore. */
 739                         return;
 740                 }
 741
 742                 /* check if it’s already downloading. */
 743                 Collection<Download> runningDownloads = FluentIterable.from(packDownloads).filter(FILTER_RUNNING).toSet();
 744                 if (!runningDownloads.isEmpty()) {
 745                         eventBus.post(new GenericMessage(String.format("Ignoring offer for %s, it’s already being downloaded.", dccSendReceived.filename())));
 746                         return;
 747                 }
 748
 749                 /* locate the correct download. */
 750                 Collection<Download> requestedDownload = FluentIterable.from(packDownloads).filter(new Predicate<Download>() {
 751
 752                         @Override
 753                         public boolean apply(Download download) {
 754                                 return download.bot().network().equals(network.get()) && download.bot().name().equalsIgnoreCase(dccSendReceived.source().nick().get());
 755                         }
 756                 }).toSet();
 757
 758                 /* we did not request this download. */
 759                 if (requestedDownload.isEmpty()) {
 760                         return;
 761                 }
 762
 763                 Download download = requestedDownload.iterator().next();
 764
 765                 /* check if the file already exists. */
 766                 File outputFile = new File(temporaryDirectory, dccSendReceived.filename());
 767                 if (outputFile.exists()) {
 768                         long existingFileSize = outputFile.length();
 769
 770                         /* file already complete? */
 771                         if ((dccSendReceived.filesize() > -1) && (existingFileSize >= dccSendReceived.filesize())) {
 772                                 /* file is apparently already complete. just move it. */
 773                                 if (outputFile.renameTo(new File(finalDirectory, download.pack().name()))) {
 774                                         eventBus.post(new GenericMessage(String.format("File %s already downloaded.", download.pack().name())));
 775                                 } else {
 776                                         eventBus.post(new GenericMessage(String.format("File %s already downloaded but not moved to %s.", download.pack().name(), finalDirectory)));
 777                                 }
 778
 779                                 /* remove download. */
 780                                 downloads.removeAll(download.pack().name());
 781                                 return;
 782                         }
 783
 784                         /* file not complete yet, DCC resume it. */
 785                         try {
 786                                 download.remoteAddress(dccSendReceived.inetAddress()).filesize(dccSendReceived.filesize());
 787                                 dccSendReceived.connection().sendDccResume(dccSendReceived.source().nick().get(), dccSendReceived.filename(), dccSendReceived.port(), existingFileSize);
 788                         } catch (IOException ioe1) {
 789                                 eventBus.post(new GenericError(String.format("Could not send DCC RESUME %s to %s (%s).", dccSendReceived.filename(), dccSendReceived.source().nick().get(), ioe1.getMessage())));
 790                         }
 791
 792                         return;
 793                 }
 794
 795                 /* file does not exist, start the download. */
 796                 try {
 797                         OutputStream fileOutputStream = new FileOutputStream(outputFile);
 798                         DccReceiver dccReceiver = new DccReceiver(eventBus, dccSendReceived.inetAddress(), dccSendReceived.port(), dccSendReceived.filename(), dccSendReceived.filesize(), fileOutputStream);
 799                         download.filename(outputFile.getPath()).outputStream(fileOutputStream).dccReceiver(dccReceiver);
 800                         dccReceivers.add(dccReceiver);
 801                         dccReceiver.start();
 802                         eventBus.post(new DownloadStarted(download));
 803                 } catch (FileNotFoundException fnfe1) {
 804                         eventBus.post(new GenericError(String.format("Could not start download of %s from %s (%s).", dccSendReceived.filename(), dccSendReceived.source().nick().get(), fnfe1.getMessage())));
 805                 }
 806         }
 807
 808         @Subscribe
 809         public void dccAcceptReceived(final DccAcceptReceived dccAcceptReceived) {
 810                 final Optional<Network> network = getNetwork(dccAcceptReceived.connection());
 811                 if (!network.isPresent()) {
 812                         return;
 813                 }
 814
 815                 Collection<Download> packDownloads = downloads.get(dccAcceptReceived.filename());
 816                 if (packDownloads.isEmpty()) {
 817                         /* unknown download, ignore. */
 818                         return;
 819                 }
 820
 821                 /* check if it’s already downloading. */
 822                 Collection<Download> runningDownloads = FluentIterable.from(packDownloads).filter(FILTER_RUNNING).toSet();
 823                 if (!runningDownloads.isEmpty()) {
 824                         eventBus.post(new GenericMessage(String.format("Ignoring offer for %s, it’s already being downloaded.", dccAcceptReceived.filename())));
 825                         return;
 826                 }
 827
 828                 /* locate the correct download. */
 829                 Collection<Download> requestedDownload = FluentIterable.from(packDownloads).filter(new Predicate<Download>() {
 830
 831                         @Override
 832                         public boolean apply(Download download) {
 833                                 return download.bot().network().equals(network.get()) && download.bot().name().equalsIgnoreCase(dccAcceptReceived.source().nick().get());
 834                         }
 835                 }).toSet();
 836
 837                 /* we did not request this download. */
 838                 if (requestedDownload.isEmpty()) {
 839                         return;
 840                 }
 841
 842                 Download download = requestedDownload.iterator().next();
 843
 844                 try {
 845                         File outputFile = new File(temporaryDirectory, dccAcceptReceived.filename());
 846                         if (outputFile.length() != dccAcceptReceived.position()) {
 847                                 eventBus.post(new GenericError(String.format("Download %s from %s does not start at the right position!")));
 848                                 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()));
 849
 850                                 downloads.removeAll(download.pack().name());
 851                                 return;
 852                         }
 853                         OutputStream outputStream = new FileOutputStream(outputFile, true);
 854                         DccReceiver dccReceiver = new DccReceiver(eventBus, download.remoteAddress(), dccAcceptReceived.port(), dccAcceptReceived.filename(), dccAcceptReceived.position(), download.filesize(), outputStream);
 855                         download.filename(outputFile.getPath()).outputStream(outputStream).dccReceiver(dccReceiver);
 856                         dccReceivers.add(dccReceiver);
 857                         dccReceiver.start();
 858                         eventBus.post(new DownloadStarted(download));
 859                 } catch (FileNotFoundException fnfe1) {
 860                 }
 861         }
 862
 863         /**
 864          * Closes the output stream of the download and moves the file to the final
 865          * location.
 866          *
 867          * @param dccDownloadFinished
 868          *              The DCC download finished event
 869          */
 870         @Subscribe
 871         public void dccDownloadFinished(DccDownloadFinished dccDownloadFinished) {
 872
 873                 /* locate the correct download. */
 874                 Collection<Download> requestedDownload = FluentIterable.from(downloads.get(dccDownloadFinished.dccReceiver().filename())).filter(FILTER_RUNNING).toSet();
 875                 if (requestedDownload.isEmpty()) {
 876                         /* this seems wrong. */
 877                         logger.warn("Download finished but could not be located.");
 878                         return;
 879                 }
 880                 Download download = requestedDownload.iterator().next();
 881
 882                 try {
 883                         download.outputStream().close();
 884                         File file = new File(download.filename());
 885                         file.renameTo(new File(finalDirectory, download.pack().name()));
 886                         eventBus.post(new DownloadFinished(download));
 887                         dccReceivers.remove(dccDownloadFinished.dccReceiver());
 888                         downloads.removeAll(download.pack().name());
 889                 } catch (IOException ioe1) {
 890                         /* TODO - handle all the errors. */
 891                         logger.warn(String.format("Could not move file %s to directory %s.", download.filename(), finalDirectory), ioe1);
 892                 }
 893         }
 894
 895         /**
 896          * Closes the output stream and notifies all listeners of the failure.
 897          *
 898          * @param dccDownloadFailed
 899          *              The DCC download failed event
 900          */
 901         @Subscribe
 902         public void dccDownloadFailed(DccDownloadFailed dccDownloadFailed) {
 903
 904                 /* locate the correct download. */
 905                 Collection<Download> requestedDownload = FluentIterable.from(downloads.get(dccDownloadFailed.dccReceiver().filename())).filter(FILTER_RUNNING).toSet();
 906                 if (requestedDownload.isEmpty()) {
 907                         /* this seems wrong. */
 908                         logger.warn("Download finished but could not be located.");
 909                         return;
 910                 }
 911                 Download download = requestedDownload.iterator().next();
 912
 913                 try {
 914                         Closeables.close(download.outputStream(), true);
 915                         eventBus.post(new DownloadFailed(download));
 916                         dccReceivers.remove(dccDownloadFailed.dccReceiver());
 917                         downloads.removeAll(download.pack().name());
 918                 } catch (IOException ioe1) {
 919                         /* swallow silently. */
 920                 }
 921         }
 922
 923         @Subscribe
 924         public void replyReceived(ReplyReceived replyReceived) {
 925                 logger.trace(String.format("%s: %s", replyReceived.connection().hostname(), replyReceived.reply()));
 926         }
 927
 928         //
 929         // PRIVATE METHODS
 930         //
 931
 932         /**
 933          * Returns the download of the given pack from the given bot.
 934          *
 935          * @param pack
 936          *              The pack being downloaded
 937          * @param bot
 938          *              The bot the pack is being downloaded from
 939          * @return The download, or {@link Optional#absent()} if the download could not
 940          *         be found
 941          */
 942         private Optional<Download> getDownload(Pack pack, Bot bot) {
 943                 if (!downloads.containsKey(pack.name())) {
 944                         return Optional.absent();
 945                 }
 946                 for (Download download : Lists.newArrayList(downloads.get(pack.name()))) {
 947                         if (download.bot().equals(bot)) {
 948                                 return Optional.of(download);
 949                         }
 950                 }
 951                 return Optional.absent();
 952         }
 953
 954         /**
 955          * Searches all current connections for the given connection, returning the
 956          * associated network.
 957          *
 958          * @param connection
 959          *              The connection to get the network for
 960          * @return The network belonging to the connection, or {@link
 961          *         Optional#absent()}
 962          */
 963         private Optional<Network> getNetwork(Connection connection) {
 964                 for (Entry<Network, Connection> networkConnectionEntry : networkConnections.entrySet()) {
 965                         if (networkConnectionEntry.getValue().equals(connection)) {
 966                                 return Optional.of(networkConnectionEntry.getKey());
 967                         }
 968                 }
 969                 return Optional.absent();
 970         }
 971
 972         /**
 973          * Returns the configured channel for the given network and name.
 974          *
 975          * @param network
 976          *              The network the channel is located on
 977          * @param channelName
 978          *              The name of the channel
 979          * @return The configured channel, or {@link Optional#absent()} if no
 980          *         configured channel matching the given network and name was found
 981          */
 982         public Optional<Channel> getChannel(Network network, String channelName) {
 983                 for (Channel channel : channels) {
 984                         if (channel.network().equals(network) && (channel.name().equalsIgnoreCase(channelName))) {
 985                                 return Optional.of(channel);
 986                         }
 987                 }
 988                 return Optional.absent();
 989         }
 990
 991         /**
 992          * Returns the extra channel for the given network and name.
 993          *
 994          * @param network
 995          *              The network the channel is located on
 996          * @param channelName
 997          *              The name of the channel
 998          * @return The extra channel, or {@link Optional#absent()} if no extra channel
 999          *         matching the given network and name was found
1000          */
1001         public Optional<Channel> getExtraChannel(Network network, String channelName) {
1002                 for (Channel channel : extraChannels) {
1003                         if (channel.network().equals(network) && (channel.name().equalsIgnoreCase(channelName))) {
1004                                 return Optional.of(channel);
1005                         }
1006                 }
1007                 return Optional.absent();
1008         }
1009
1010         /**
1011          * Parses {@link Pack} information from the given message.
1012          *
1013          * @param message
1014          *              The message to parse pack information from
1015          * @return The parsed pack, or {@link Optional#absent()} if the message could
1016          *         not be parsed into a pack
1017          */
1018         private Optional<Pack> parsePack(String message) {
1019                 int squareOpen = message.indexOf('[');
1020                 int squareClose = message.indexOf(']', squareOpen);
1021                 if ((squareOpen == -1) && (squareClose == -1)) {
1022                         return Optional.absent();
1023                 }
1024                 String packSize = message.substring(squareOpen + 1, squareClose);
1025                 String packName = message.substring(message.lastIndexOf(' ') + 1);
1026                 String packIndex = message.substring(0, message.indexOf(' ')).substring(1);
1027                 return Optional.of(new Pack(packIndex, packSize, packName));
1028         }
1029
1030 }