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.event.ChannelNotJoined.Reason.banned;
  22 import static net.pterodactylus.irc.event.ChannelNotJoined.Reason.registeredNicknamesOnly;
  23 import static net.pterodactylus.irc.util.MessageCleaner.getDefaultInstance;
  24 import static net.pterodactylus.xdcc.data.Channel.TO_NETWORK;
  25 import static net.pterodactylus.xdcc.data.Download.FILTER_RUNNING;
  26
  27 import java.io.File;
  28 import java.io.FileNotFoundException;
  29 import java.io.FileOutputStream;
  30 import java.io.IOException;
  31 import java.io.OutputStream;
  32 import java.util.Collection;
  33 import java.util.Collections;
  34 import java.util.Iterator;
  35 import java.util.List;
  36 import java.util.Map;
  37 import java.util.Map.Entry;
  38 import java.util.concurrent.TimeUnit;
  39 import java.util.stream.Collectors;
  40
  41 import net.pterodactylus.irc.Connection;
  42 import net.pterodactylus.irc.ConnectionFactory;
  43 import net.pterodactylus.irc.DccReceiver;
  44 import net.pterodactylus.irc.DefaultConnection;
  45 import net.pterodactylus.irc.event.ChannelJoined;
  46 import net.pterodactylus.irc.event.ChannelLeft;
  47 import net.pterodactylus.irc.event.ChannelMessageReceived;
  48 import net.pterodactylus.irc.event.ChannelNotJoined;
  49 import net.pterodactylus.irc.event.ClientQuit;
  50 import net.pterodactylus.irc.event.ConnectionClosed;
  51 import net.pterodactylus.irc.event.ConnectionEstablished;
  52 import net.pterodactylus.irc.event.ConnectionFailed;
  53 import net.pterodactylus.irc.event.DccAcceptReceived;
  54 import net.pterodactylus.irc.event.DccDownloadFailed;
  55 import net.pterodactylus.irc.event.DccDownloadFinished;
  56 import net.pterodactylus.irc.event.DccSendReceived;
  57 import net.pterodactylus.irc.event.KickedFromChannel;
  58 import net.pterodactylus.irc.event.NicknameChanged;
  59 import net.pterodactylus.irc.event.PrivateMessageReceived;
  60 import net.pterodactylus.irc.event.PrivateNoticeReceived;
  61 import net.pterodactylus.irc.event.ReplyReceived;
  62 import net.pterodactylus.irc.util.RandomNickname;
  63 import net.pterodactylus.xdcc.core.event.BotAdded;
  64 import net.pterodactylus.xdcc.core.event.CoreStarted;
  65 import net.pterodactylus.xdcc.core.event.DownloadFailed;
  66 import net.pterodactylus.xdcc.core.event.DownloadFinished;
  67 import net.pterodactylus.xdcc.core.event.DownloadStarted;
  68 import net.pterodactylus.xdcc.core.event.GenericError;
  69 import net.pterodactylus.xdcc.core.event.GenericMessage;
  70 import net.pterodactylus.xdcc.core.event.MessageReceived;
  71 import net.pterodactylus.xdcc.data.Bot;
  72 import net.pterodactylus.xdcc.data.Channel;
  73 import net.pterodactylus.xdcc.data.ConnectedNetwork;
  74 import net.pterodactylus.xdcc.data.Download;
  75 import net.pterodactylus.xdcc.data.Network;
  76 import net.pterodactylus.xdcc.data.Pack;
  77 import net.pterodactylus.xdcc.data.Server;
  78
  79 import com.google.common.base.Optional;
  80 import com.google.common.base.Predicate;
  81 import com.google.common.collect.FluentIterable;
  82 import com.google.common.collect.HashBasedTable;
  83 import com.google.common.collect.HashMultimap;
  84 import com.google.common.collect.ImmutableList;
  85 import com.google.common.collect.ImmutableSet;
  86 import com.google.common.collect.Lists;
  87 import com.google.common.collect.Maps;
  88 import com.google.common.collect.Multimap;
  89 import com.google.common.collect.Sets;
  90 import com.google.common.collect.Table;
  91 import com.google.common.eventbus.EventBus;
  92 import com.google.common.eventbus.Subscribe;
  93 import com.google.common.io.Closeables;
  94 import com.google.common.util.concurrent.AbstractExecutionThreadService;
  95 import com.google.inject.Inject;
  96 import org.apache.log4j.Logger;
  97
  98 /**
  99  * The core of XDCC Downloader.
 100  *
 101  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
 102  */
 103 public class Core extends AbstractExecutionThreadService {
 104
 105         /** The logger. */
 106         private static final Logger logger = Logger.getLogger(Core.class.getName());
 107
 108         private final Object syncObject = new Object();
 109         /** The event bus. */
 110         private final EventBus eventBus;
 111         private final ConnectionFactory connectionFactory;
 112         private final ChannelBanManager channelBanManager =
 113                         new ChannelBanManager();
 114
 115         /** The temporary directory to download files to. */
 116         private final String temporaryDirectory;
 117
 118         /** The directory to move finished downloads to. */
 119         private final String finalDirectory;
 120
 121         /** The channels that should be monitored. */
 122         private final Collection<Channel> channels = Sets.newHashSet();
 123
 124         /** The channels that are currentlymonitored. */
 125         private final Collection<Channel> joinedChannels = Sets.newHashSet();
 126
 127         /** The channels that are joined but not configured. */
 128         private final Collection<Channel> extraChannels = Sets.newHashSet();
 129
 130         /** The current network connections. */
 131         private final Map<Network, Connection> networkConnections = Collections.synchronizedMap(Maps.<Network, Connection>newHashMap());
 132
 133         /** The currently known bots. */
 134         private final Table<Network, String, Bot> networkBots = HashBasedTable.create();
 135
 136         /** The current downloads. */
 137         private final Multimap<String, Download> downloads = HashMultimap.create();
 138
 139         /** The current DCC receivers. */
 140         private final Collection<DccReceiver> dccReceivers = Lists.newArrayList();
 141
 142         /**
 143          * Creates a new core.
 144          *
 145          * @param eventBus
 146          *              The event bus
 147          * @param temporaryDirectory
 148          *              The directory to download files to
 149          * @param finalDirectory
 150          *              The directory to move finished files to
 151          */
 152         @Inject
 153         public Core(EventBus eventBus, ConnectionFactory connectionFactory, String temporaryDirectory, String finalDirectory) {
 154                 this.eventBus = eventBus;
 155                 this.connectionFactory = connectionFactory;
 156                 this.temporaryDirectory = temporaryDirectory;
 157                 this.finalDirectory = finalDirectory;
 158         }
 159
 160         //
 161         // ACCESSORS
 162         //
 163
 164         /**
 165          * Returns all currently known connections.
 166          *
 167          * @return All currently known connections
 168          */
 169         public Collection<Connection> connections() {
 170                 return networkConnections.values();
 171         }
 172
 173         /**
 174          * Returns all defined networks.
 175          *
 176          * @return All defined networks
 177          */
 178         public Collection<Network> networks() {
 179                 return FluentIterable.from(channels).transform(TO_NETWORK).toSet();
 180         }
 181
 182         /**
 183          * Returns all connected networks.
 184          *
 185          * @return All connected networks
 186          */
 187         public Collection<ConnectedNetwork> connectedNetworks() {
 188                 return networkConnections.entrySet().stream().map((entry) -> {
 189                         Network network = entry.getKey();
 190                         Collection<Bot> bots = networkBots.row(network).values();
 191                         int packCount = bots.stream().mapToInt((bot) -> bot.packs().size()).reduce((a, b) -> a + b).orElse(0);
 192                         return new ConnectedNetwork(network, entry.getValue().hostname(),
 193                                         entry.getValue().port(), entry.getValue().nickname(),
 194                                         channels.stream()
 195                                                         .filter((channel) -> channel.network()
 196                                                                         .equals(network))
 197                                                         .map(Channel::name)
 198                                                         .collect(Collectors.<String>toList()),
 199                                         extraChannels.stream()
 200                                                         .filter((channel) -> channel.network()
 201                                                                         .equals(network))
 202                                                         .map(Channel::name)
 203                                                         .collect(Collectors.<String>toList()),
 204                                         bots.size(), packCount);
 205                 }).collect(Collectors.<ConnectedNetwork>toList());
 206         }
 207
 208         /**
 209          * Returns all configured channels. Due to various circumstances, configured
 210          * channels might not actually be joined.
 211          *
 212          * @return All configured channels
 213          */
 214         public Collection<Channel> channels() {
 215                 return ImmutableSet.copyOf(channels);
 216         }
 217
 218         /**
 219          * Returns all currently joined channels.
 220          *
 221          * @return All currently joined channels
 222          */
 223         public Collection<Channel> joinedChannels() {
 224                 return ImmutableSet.copyOf(joinedChannels);
 225         }
 226
 227         /**
 228          * Returns all currently joined channels that are not configured.
 229          *
 230          * @return All currently joined but not configured channels
 231          */
 232         public Collection<Channel> extraChannels() {
 233                 return ImmutableSet.copyOf(extraChannels);
 234         }
 235
 236         /**
 237          * Returns all currently known bots.
 238          *
 239          * @return All currently known bots
 240          */
 241         public Collection<Bot> bots() {
 242                 return networkBots.values();
 243         }
 244
 245         /**
 246          * Returns all currently running downloads.
 247          *
 248          * @return All currently running downloads
 249          */
 250         public Collection<Download> downloads() {
 251                 return downloads.values();
 252         }
 253
 254         //
 255         // ACTIONS
 256         //
 257
 258         /**
 259          * Adds a channel to monitor.
 260          *
 261          * @param channel
 262          *              The channel to monitor
 263          */
 264         public void addChannel(Channel channel) {
 265                 channels.add(channel);
 266         }
 267
 268         /**
 269          * Fetches the given pack from the given bot.
 270          *
 271          * @param bot
 272          *              The bot to fetch the pack from
 273          * @param pack
 274          *              The pack to fetch
 275          */
 276         public void fetch(Bot bot, Pack pack) {
 277                 Connection connection = networkConnections.get(bot.network());
 278                 if (connection == null) {
 279                         return;
 280                 }
 281
 282                 /* check if we are already downloading the file? */
 283                 if (downloads.containsKey(pack.name())) {
 284                         Collection<Download> packDownloads = downloads.get(pack.name());
 285                         Collection<Download> runningDownloads = FluentIterable.from(packDownloads).filter(FILTER_RUNNING).toSet();
 286                         if (!runningDownloads.isEmpty()) {
 287                                 Download download = runningDownloads.iterator().next();
 288                                 eventBus.post(new GenericMessage(String.format("File %s is already downloading from %s (%s).", pack.name(), download.bot().name(), download.bot().network().name())));
 289                                 return;
 290                         }
 291                         StringBuilder bots = new StringBuilder();
 292                         for (Download download : packDownloads) {
 293                                 if (bots.length() > 0) {
 294                                         bots.append(", ");
 295                                 }
 296                                 bots.append(download.bot().name()).append(" (").append(download.bot().network().name()).append(')');
 297                         }
 298                         eventBus.post(new GenericMessage(String.format("File %s is already requested from %d bots (%s).", pack.name(), packDownloads.size(), bots.toString())));
 299                 }
 300
 301                 Download download = new Download(bot, pack);
 302                 downloads.put(pack.name(), download);
 303
 304                 try {
 305                         connection.sendMessage(bot.name(), "XDCC SEND " + pack.id());
 306                 } catch (IOException ioe1) {
 307                         logger.warn("Could not send message to bot!", ioe1);
 308                 }
 309         }
 310
 311         /**
 312          * Cancels the download of the given pack from the given bot.
 313          *
 314          * @param bot
 315          *              The bot the pack is being downloaded from
 316          * @param pack
 317          *              The pack being downloaded
 318          */
 319         public void cancelDownload(Bot bot, Pack pack) {
 320                 Optional<Download> download = getDownload(pack, bot);
 321                 if (!download.isPresent()) {
 322                         return;
 323                 }
 324
 325                 /* get connection. */
 326                 Connection connection = networkConnections.get(bot.network());
 327                 if (connection == null) {
 328                         /* request for unknown network? */
 329                         return;
 330                 }
 331
 332                 /* stop the DCC receiver. */
 333                 if (download.get().dccReceiver() != null) {
 334                         download.get().dccReceiver().stop();
 335                 } else {
 336                         /* remove download if it hasn’t started yet. */
 337                         downloads.remove(pack.name(), download.get());
 338                 }
 339
 340                 /* remove the request from the bot, too. */
 341                 try {
 342                         connection.sendMessage(bot.name(), String.format("XDCC %s", (download.get().dccReceiver() != null) ? "CANCEL" : "REMOVE"));
 343                 } catch (IOException ioe1) {
 344                         logger.warn(String.format("Could not cancel DCC from %s (%s)!", bot.name(), bot.network().name()), ioe1);
 345                 }
 346         }
 347
 348         /**
 349          * Closes the given connection.
 350          *
 351          * @param connection
 352          *              The connection to close
 353          */
 354         public void closeConnection(Connection connection) {
 355                 try {
 356                         connection.close();
 357                 } catch (IOException ioe1) {
 358                         /* TODO */
 359                 }
 360         }
 361
 362         //
 363         // ABSTRACTIDLESERVICE METHODS
 364         //
 365
 366         @Override
 367         protected void startUp() {
 368                 for (Channel channel : channels) {
 369                         logger.info(String.format("Connecting to Channel %s on Network %s…", channel.name(), channel.network().name()));
 370                         connectNetwork(channel.network());
 371                 }
 372
 373                 /* notify listeners. */
 374                 eventBus.post(new CoreStarted(this));
 375         }
 376
 377         @Override
 378         protected void run() throws Exception {
 379                 while (isRunning()) {
 380                         synchronized (syncObject) {
 381                                 try {
 382                                         syncObject.wait(TimeUnit.MINUTES.toMillis(1));
 383                                 } catch (InterruptedException ie1) {
 384                                         /* ignore. */
 385                                 }
 386                         }
 387
 388                         /* find channels that should be monitored but are not. */
 389                         for (Channel channel : channels) {
 390                                 if (joinedChannels.contains(channel)) {
 391                                         continue;
 392                                 }
 393
 394                                 /* are we banned from this channel? */
 395                                 if (channelBanManager.isBanned(channel)) {
 396                                         continue;
 397                                 }
 398
 399                                 connectNetwork(channel.network());
 400                                 Connection connection = networkConnections.get(channel.network());
 401                                 if (connection.established()) {
 402                                         eventBus.post(new GenericMessage(String.format("Trying to join %s on %s.", channel.name(), channel.network().name())));
 403                                         try {
 404                                                 connection.joinChannel(channel.name());
 405                                         } catch (IOException ioe1) {
 406                                                 eventBus.post(new GenericMessage(String.format("Could not join %s on %s.", channel.name(), channel.network().name())));
 407                                         }
 408                                 }
 409                         }
 410                 }
 411         }
 412
 413         @Override
 414         protected void triggerShutdown() {
 415                 synchronized (syncObject) {
 416                         syncObject.notifyAll();
 417                 }
 418         }
 419
 420         //
 421         // PRIVATE METHODS
 422         //
 423
 424         /**
 425          * Starts a new connection for the given network if no such connection exists
 426          * already.
 427          *
 428          * @param network
 429          *              The network to connect to
 430          */
 431         private void connectNetwork(Network network) {
 432                 if (!networkConnections.containsKey(network)) {
 433                                 /* select a random server. */
 434                         List<Server> servers = Lists.newArrayList(network.servers());
 435                         if (servers.isEmpty()) {
 436                                 eventBus.post(new GenericError(String.format("Network %s does not have any servers.", network.name())));
 437                                 return;
 438                         }
 439                         Server server = servers.get((int) (Math.random() * servers.size()));
 440                         Connection connection = connectionFactory.createConnection(server.hostname(),
 441                                         server.unencryptedPorts().iterator().next());
 442                         connection.username(RandomNickname.get()).realName(RandomNickname.get());
 443                         networkConnections.put(network, connection);
 444                         connection.open();
 445                 }
 446         }
 447
 448         /**
 449          * Removes the given connection and all its channels and bots.
 450          *
 451          * @param connection
 452          *              The connection to remove
 453          */
 454         private void removeConnection(Connection connection) {
 455                 Optional<Network> network = getNetwork(connection);
 456                 if (!network.isPresent()) {
 457                         return;
 458                 }
 459                 if (!connection.established()) {
 460                         return;
 461                 }
 462
 463                 /* find all channels that need to be removed. */
 464                 for (Collection<Channel> channels : ImmutableList.of(joinedChannels, extraChannels)) {
 465                         for (Iterator<Channel> channelIterator = channels.iterator(); channelIterator.hasNext(); ) {
 466                                 Channel joinedChannel = channelIterator.next();
 467                                 if (!joinedChannel.network().equals(network.get())) {
 468                                         continue;
 469                                 }
 470
 471                                 channelIterator.remove();
 472                         }
 473                 }
 474
 475                 /* now remove all bots for that network. */
 476                 Map<String, Bot> bots = networkBots.row(network.get());
 477                 int botCount = bots.size();
 478                 int packCount = 0;
 479                 for (Bot bot : bots.values()) {
 480                         packCount += bot.packs().size();
 481                 }
 482                 bots.clear();
 483                 eventBus.post(new GenericMessage(String.format("Network %s disconnected, %d bots removed, %d packs removed.", network.get().name(), botCount, packCount)));
 484
 485                 /* now remove the network. */
 486                 networkConnections.remove(network.get());
 487         }
 488
 489         //
 490         // EVENT HANDLERS
 491         //
 492
 493         /**
 494          * If a connection to a network has been established, the channels associated
 495          * with this network are joined.
 496          *
 497          * @param connectionEstablished
 498          *              The connection established event
 499          */
 500         @Subscribe
 501         public void connectionEstablished(ConnectionEstablished connectionEstablished) {
 502
 503                 /* get network for connection. */
 504                 Optional<Network> network = getNetwork(connectionEstablished.connection());
 505
 506                 /* found network? */
 507                 if (!network.isPresent()) {
 508                         eventBus.post(new GenericMessage(String.format("Connected to unknown network: %s", connectionEstablished.connection().hostname())));
 509                         return;
 510                 }
 511
 512                 eventBus.post(new GenericMessage(String.format("Connected to network %s.", network.get().name())));
 513
 514                 /* join all channels on this network. */
 515                 for (Channel channel : channels) {
 516                         if (channel.network().equals(network.get())) {
 517                                 try {
 518                                         eventBus.post(new GenericMessage(String.format("Trying to join %s on %s...", channel.name(), network.get().name())));
 519                                         connectionEstablished.connection().joinChannel(channel.name());
 520                                 } catch (IOException ioe1) {
 521                                         logger.warn(String.format("Could not join %s on %s!", channel.name(), network.get().name()), ioe1);
 522                                 }
 523                         }
 524                 }
 525         }
 526
 527         /**
 528          * Remove all data stored for a network if the connection is closed.
 529          *
 530          * @param connectionClosed
 531          *              The connection closed event
 532          */
 533         @Subscribe
 534         public void connectionClosed(ConnectionClosed connectionClosed) {
 535                 removeConnection(connectionClosed.connection());
 536         }
 537
 538         /**
 539          * Remove all data stored for a network if the connection fails.
 540          *
 541          * @param connectionFailed
 542          *              The connection failed event
 543          */
 544         @Subscribe
 545         public void connectionFailed(ConnectionFailed connectionFailed) {
 546                 removeConnection(connectionFailed.connection());
 547         }
 548
 549         /**
 550          * Shows a message when a channel was joined by us.
 551          *
 552          * @param channelJoined
 553          *              The channel joined event
 554          */
 555         @Subscribe
 556         public void channelJoined(ChannelJoined channelJoined) {
 557                 if (channelJoined.connection().isSource(channelJoined.client())) {
 558                         Optional<Network> network = getNetwork(channelJoined.connection());
 559                         if (!network.isPresent()) {
 560                                 return;
 561                         }
 562
 563                         Optional<Channel> channel = getChannel(network.get(), channelJoined.channel());
 564                         if (!channel.isPresent()) {
 565                                 /* it’s an extra channel. */
 566                                 extraChannels.add(new Channel(network.get(), channelJoined.channel()));
 567                                 logger.info(String.format("Joined extra Channel %s on %s.", channelJoined.channel(), network.get().name()));
 568                                 return;
 569                         }
 570
 571                         channelBanManager.unban(channel.get());
 572                         joinedChannels.add(channel.get());
 573                         logger.info(String.format("Joined Channel %s on %s.", channelJoined.channel(), network.get().name()));
 574                 }
 575         }
 576
 577         @Subscribe
 578         public void channelNotJoined(ChannelNotJoined channelNotJoined) {
 579                 Optional<Network> network = getNetwork(channelNotJoined.connection());
 580                 if (!network.isPresent()) {
 581                         return;
 582                 }
 583
 584                 Optional<Channel> channel = getChannel(network.get(), channelNotJoined.channel());
 585                 if (!channel.isPresent()) {
 586                         eventBus.post(new GenericMessage(format("Could not join %s but didn’t try to join, either.", channel.get())));
 587                         return;
 588                 }
 589
 590                 /* remove all bots for this channel, we might have been kicked. */
 591                 Collection<Bot> botsToRemove = networkBots.row(network.get())
 592                                 .values().stream()
 593                                 .filter(bot -> bot.channel()
 594                                                 .equalsIgnoreCase(channel.get().name()))
 595                                 .collect(Collectors.toSet());
 596                 botsToRemove.stream()
 597                                 .forEach(bot -> networkBots.row(network.get())
 598                                                 .remove(bot.name()));
 599
 600                 if (channelNotJoined.reason() == registeredNicknamesOnly) {
 601                         channels.remove(channel.get());
 602                         eventBus.post(new GenericMessage(
 603                                         format("Not trying to join %s anymore.", channel.get())));
 604                         return;
 605                 }
 606                 if (channelNotJoined.reason() == banned) {
 607                         channelBanManager.ban(channel.get());
 608                         eventBus.post(new GenericMessage(
 609                                         format("Banned from %s, suspending join for a day.",
 610                                                         channel.get())));
 611                         return;
 612                 }
 613
 614                 eventBus.post(new GenericMessage(
 615                                 format("Could not join %s: %s", channelNotJoined.channel(),
 616                                                 channelNotJoined.reason())));
 617         }
 618
 619         /**
 620          * Removes bots that leave a channel, or channels when it’s us that’s leaving.
 621          *
 622          * @param channelLeft
 623          *              The channel left event
 624          */
 625         @Subscribe
 626         public void channelLeft(ChannelLeft channelLeft) {
 627                 Optional<Network> network = getNetwork(channelLeft.connection());
 628                 if (!network.isPresent()) {
 629                         return;
 630                 }
 631
 632                 Bot bot = networkBots.get(network.get(), channelLeft.client().nick().get());
 633                 if (bot == null) {
 634                         /* maybe it was us? */
 635                         if (channelLeft.connection().isSource(channelLeft.client())) {
 636                                 Optional<Channel> channel = getChannel(network.get(), channelLeft.channel());
 637                                 if (!channel.isPresent()) {
 638                                         /* maybe it was an extra channel? */
 639                                         channel = getExtraChannel(network.get(), channelLeft.channel());
 640                                         if (!channel.isPresent()) {
 641                                                 /* okay, whatever. */
 642                                                 return;
 643                                         }
 644
 645                                         extraChannels.remove(channel);
 646                                 } else {
 647                                         channels.remove(channel.get());
 648                                 }
 649
 650                                 eventBus.post(new GenericMessage(String.format("Left Channel %s on %s.", channel.get().name(), channel.get().network().name())));
 651                         }
 652
 653                         return;
 654                 }
 655
 656                 networkBots.remove(network.get(), channelLeft.client().nick().get());
 657         }
 658
 659         @Subscribe
 660         public void kickedFromChannel(KickedFromChannel kickedFromChannel) {
 661                 Optional<Network> network = getNetwork(kickedFromChannel.connection());
 662                 if (!network.isPresent()) {
 663                         return;
 664                 }
 665
 666                 /* have we been kicked? */
 667                 if (nicknameMatchesConnection(kickedFromChannel.connection(), kickedFromChannel.kickee())) {
 668                         Optional<Channel> channel = getChannel(network.get(), kickedFromChannel.channel());
 669                         if (!channel.isPresent()) {
 670                                 /* maybe it was an extra channel? */
 671                                 channel = getExtraChannel(network.get(), kickedFromChannel.channel());
 672                                 if (!channel.isPresent()) {
 673                                         /* okay, whatever. */
 674                                         return;
 675                                 }
 676
 677                                 extraChannels.remove(channel);
 678                         } else {
 679                                 channels.remove(channel.get());
 680                         }
 681                         eventBus.post(new GenericMessage(format(
 682                                         "Kicked from %s by %s: %s",
 683                                         kickedFromChannel.channel(),
 684                                         kickedFromChannel.kicker(),
 685                                         kickedFromChannel.reason().or("<unknown>")
 686                         )));
 687                 }
 688         }
 689
 690         private boolean nicknameMatchesConnection(Connection connection, String nickname) {
 691                 return connection.nickname().equalsIgnoreCase(nickname);
 692         }
 693
 694         /**
 695          * Removes a client (which may be a bot) from the table of known bots.
 696          *
 697          * @param clientQuit
 698          *              The client quit event
 699          */
 700         @Subscribe
 701         public void clientQuit(ClientQuit clientQuit) {
 702                 Optional<Network> network = getNetwork(clientQuit.connection());
 703                 if (!network.isPresent()) {
 704                         return;
 705                 }
 706
 707                 networkBots.remove(network.get(), clientQuit.client().nick().get());
 708         }
 709
 710         /**
 711          * If the nickname of a bit changes, remove it from the old name and store it
 712          * under the new name.
 713          *
 714          * @param nicknameChanged
 715          *              The nickname changed event
 716          */
 717         @Subscribe
 718         public void nicknameChanged(NicknameChanged nicknameChanged) {
 719                 Optional<Network> network = getNetwork(nicknameChanged.connection());
 720                 if (!network.isPresent()) {
 721                         return;
 722                 }
 723
 724                 Bot bot = networkBots.remove(network.get(), nicknameChanged.client().nick().get());
 725                 if (bot == null) {
 726                         return;
 727                 }
 728
 729                 networkBots.put(network.get(), nicknameChanged.newNickname(), bot);
 730         }
 731
 732         /**
 733          * If a message on a channel is received, it is parsed for pack information
 734          * with is then added to a bot.
 735          *
 736          * @param channelMessageReceived
 737          *              The channel message received event
 738          */
 739         @Subscribe
 740         public void channelMessageReceived(ChannelMessageReceived channelMessageReceived) {
 741                 String message = getDefaultInstance().clean(channelMessageReceived.message());
 742                 if (!message.startsWith("#")) {
 743                         /* most probably not a pack announcement. */
 744                         return;
 745                 }
 746
 747                 Optional<Network> network = getNetwork(channelMessageReceived.connection());
 748                 if (!network.isPresent()) {
 749                         /* message for unknown connection? */
 750                         return;
 751                 }
 752
 753                 /* parse pack information. */
 754                 Optional<Pack> pack = parsePack(message);
 755                 if (!pack.isPresent()) {
 756                         return;
 757                 }
 758
 759                 Bot bot;
 760                 synchronized (networkBots) {
 761                         if (!networkBots.contains(network.get(), channelMessageReceived.source().nick().get())) {
 762                                 bot = new Bot(network.get(), channelMessageReceived.channel(),
 763                                                 channelMessageReceived.source().nick().get());
 764                                 networkBots.put(network.get(), channelMessageReceived.source().nick().get(), bot);
 765                                 eventBus.post(new BotAdded(bot));
 766                         } else {
 767                                 bot = networkBots.get(network.get(), channelMessageReceived.source().nick().get());
 768                         }
 769                 }
 770
 771                 /* add pack. */
 772                 bot.addPack(pack.get());
 773                 logger.debug(String.format("Bot %s now has %d packs.", bot, bot.packs().size()));
 774         }
 775
 776         /**
 777          * Forward all private messages to every console.
 778          *
 779          * @param privateMessageReceived
 780          *              The private message recevied event
 781          */
 782         @Subscribe
 783         public void privateMessageReceived(PrivateMessageReceived privateMessageReceived) {
 784                 eventBus.post(new MessageReceived(privateMessageReceived.source(), privateMessageReceived.message()));
 785         }
 786
 787         /**
 788          * Sends a message to all console when a notice was received.
 789          *
 790          * @param privateNoticeReceived
 791          *              The notice received event
 792          */
 793         @Subscribe
 794         public void privateNoticeReceived(PrivateNoticeReceived privateNoticeReceived) {
 795                 Optional<Network> network = getNetwork(privateNoticeReceived.connection());
 796                 if (!network.isPresent()) {
 797                         return;
 798                 }
 799
 800                 eventBus.post(new GenericMessage(String.format("Notice from %s (%s): %s", privateNoticeReceived.source(), network.get(), privateNoticeReceived.text())));
 801         }
 802
 803         /**
 804          * Starts a DCC download.
 805          *
 806          * @param dccSendReceived
 807          *              The DCC SEND event
 808          */
 809         @Subscribe
 810         public void dccSendReceived(final DccSendReceived dccSendReceived) {
 811                 final Optional<Network> network = getNetwork(dccSendReceived.connection());
 812                 if (!network.isPresent()) {
 813                         return;
 814                 }
 815
 816                 Collection<Download> packDownloads = downloads.get(dccSendReceived.filename());
 817                 if (packDownloads.isEmpty()) {
 818                         /* unknown download, ignore. */
 819                         return;
 820                 }
 821
 822                 /* check if it’s already downloading. */
 823                 Collection<Download> runningDownloads = FluentIterable.from(packDownloads).filter(FILTER_RUNNING).toSet();
 824                 if (!runningDownloads.isEmpty()) {
 825                         eventBus.post(new GenericMessage(String.format("Ignoring offer for %s, it’s already being downloaded.", dccSendReceived.filename())));
 826                         return;
 827                 }
 828
 829                 /* locate the correct download. */
 830                 Collection<Download> requestedDownload = FluentIterable.from(packDownloads).filter(new Predicate<Download>() {
 831
 832                         @Override
 833                         public boolean apply(Download download) {
 834                                 return download.bot().network().equals(network.get()) && download.bot().name().equalsIgnoreCase(dccSendReceived.source().nick().get());
 835                         }
 836                 }).toSet();
 837
 838                 /* we did not request this download. */
 839                 if (requestedDownload.isEmpty()) {
 840                         return;
 841                 }
 842
 843                 Download download = requestedDownload.iterator().next();
 844
 845                 /* check if the file already exists. */
 846                 File outputFile = new File(temporaryDirectory, dccSendReceived.filename());
 847                 if (outputFile.exists()) {
 848                         long existingFileSize = outputFile.length();
 849
 850                         /* file already complete? */
 851                         if ((dccSendReceived.filesize() > -1) && (existingFileSize >= dccSendReceived.filesize())) {
 852                                 /* file is apparently already complete. just move it. */
 853                                 if (outputFile.renameTo(new File(finalDirectory, download.pack().name()))) {
 854                                         eventBus.post(new GenericMessage(String.format("File %s already downloaded.", download.pack().name())));
 855                                 } else {
 856                                         eventBus.post(new GenericMessage(String.format("File %s already downloaded but not moved to %s.", download.pack().name(), finalDirectory)));
 857                                 }
 858
 859                                 /* remove download. */
 860                                 downloads.removeAll(download.pack().name());
 861                                 return;
 862                         }
 863
 864                         /* file not complete yet, DCC resume it. */
 865                         try {
 866                                 download.remoteAddress(dccSendReceived.inetAddress()).filesize(dccSendReceived.filesize());
 867                                 dccSendReceived.connection().sendDccResume(dccSendReceived.source().nick().get(), dccSendReceived.filename(), dccSendReceived.port(), existingFileSize);
 868                         } catch (IOException ioe1) {
 869                                 eventBus.post(new GenericError(String.format("Could not send DCC RESUME %s to %s (%s).", dccSendReceived.filename(), dccSendReceived.source().nick().get(), ioe1.getMessage())));
 870                         }
 871
 872                         return;
 873                 }
 874
 875                 /* file does not exist, start the download. */
 876                 try {
 877                         OutputStream fileOutputStream = new FileOutputStream(outputFile);
 878                         DccReceiver dccReceiver = new DccReceiver(eventBus, dccSendReceived.inetAddress(), dccSendReceived.port(), dccSendReceived.filename(), dccSendReceived.filesize(), fileOutputStream);
 879                         download.filename(outputFile.getPath()).outputStream(fileOutputStream).dccReceiver(dccReceiver);
 880                         dccReceivers.add(dccReceiver);
 881                         dccReceiver.start();
 882                         eventBus.post(new DownloadStarted(download));
 883                 } catch (FileNotFoundException fnfe1) {
 884                         eventBus.post(new GenericError(String.format("Could not start download of %s from %s (%s).", dccSendReceived.filename(), dccSendReceived.source().nick().get(), fnfe1.getMessage())));
 885                 }
 886         }
 887
 888         @Subscribe
 889         public void dccAcceptReceived(final DccAcceptReceived dccAcceptReceived) {
 890                 final Optional<Network> network = getNetwork(dccAcceptReceived.connection());
 891                 if (!network.isPresent()) {
 892                         return;
 893                 }
 894
 895                 Collection<Download> packDownloads = downloads.get(dccAcceptReceived.filename());
 896                 if (packDownloads.isEmpty()) {
 897                         /* unknown download, ignore. */
 898                         return;
 899                 }
 900
 901                 /* check if it’s already downloading. */
 902                 Collection<Download> runningDownloads = FluentIterable.from(packDownloads).filter(FILTER_RUNNING).toSet();
 903                 if (!runningDownloads.isEmpty()) {
 904                         eventBus.post(new GenericMessage(String.format("Ignoring offer for %s, it’s already being downloaded.", dccAcceptReceived.filename())));
 905                         return;
 906                 }
 907
 908                 /* locate the correct download. */
 909                 Collection<Download> requestedDownload = FluentIterable.from(packDownloads).filter(new Predicate<Download>() {
 910
 911                         @Override
 912                         public boolean apply(Download download) {
 913                                 return download.bot().network().equals(network.get()) && download.bot().name().equalsIgnoreCase(dccAcceptReceived.source().nick().get());
 914                         }
 915                 }).toSet();
 916
 917                 /* we did not request this download. */
 918                 if (requestedDownload.isEmpty()) {
 919                         return;
 920                 }
 921
 922                 Download download = requestedDownload.iterator().next();
 923
 924                 try {
 925                         File outputFile = new File(temporaryDirectory, dccAcceptReceived.filename());
 926                         if (outputFile.length() != dccAcceptReceived.position()) {
 927                                 eventBus.post(new GenericError(String.format("Download %s from %s does not start at the right position!")));
 928                                 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()));
 929
 930                                 downloads.removeAll(download.pack().name());
 931                                 return;
 932                         }
 933                         OutputStream outputStream = new FileOutputStream(outputFile, true);
 934                         DccReceiver dccReceiver = new DccReceiver(eventBus, download.remoteAddress(), dccAcceptReceived.port(), dccAcceptReceived.filename(), dccAcceptReceived.position(), download.filesize(), outputStream);
 935                         download.filename(outputFile.getPath()).outputStream(outputStream).dccReceiver(dccReceiver);
 936                         dccReceivers.add(dccReceiver);
 937                         dccReceiver.start();
 938                         eventBus.post(new DownloadStarted(download));
 939                 } catch (FileNotFoundException fnfe1) {
 940                 }
 941         }
 942
 943         /**
 944          * Closes the output stream of the download and moves the file to the final
 945          * location.
 946          *
 947          * @param dccDownloadFinished
 948          *              The DCC download finished event
 949          */
 950         @Subscribe
 951         public void dccDownloadFinished(DccDownloadFinished dccDownloadFinished) {
 952
 953                 /* locate the correct download. */
 954                 Collection<Download> requestedDownload = FluentIterable.from(downloads.get(dccDownloadFinished.dccReceiver().filename())).filter(FILTER_RUNNING).toSet();
 955                 if (requestedDownload.isEmpty()) {
 956                         /* this seems wrong. */
 957                         logger.warn("Download finished but could not be located.");
 958                         return;
 959                 }
 960                 Download download = requestedDownload.iterator().next();
 961
 962                 try {
 963                         download.outputStream().close();
 964                         File file = new File(download.filename());
 965                         file.renameTo(new File(finalDirectory, download.pack().name()));
 966                         eventBus.post(new DownloadFinished(download));
 967                         dccReceivers.remove(dccDownloadFinished.dccReceiver());
 968                         downloads.removeAll(download.pack().name());
 969                 } catch (IOException ioe1) {
 970                         /* TODO - handle all the errors. */
 971                         logger.warn(String.format("Could not move file %s to directory %s.", download.filename(), finalDirectory), ioe1);
 972                 }
 973         }
 974
 975         /**
 976          * Closes the output stream and notifies all listeners of the failure.
 977          *
 978          * @param dccDownloadFailed
 979          *              The DCC download failed event
 980          */
 981         @Subscribe
 982         public void dccDownloadFailed(DccDownloadFailed dccDownloadFailed) {
 983
 984                 /* locate the correct download. */
 985                 Collection<Download> requestedDownload = FluentIterable.from(downloads.get(dccDownloadFailed.dccReceiver().filename())).filter(FILTER_RUNNING).toSet();
 986                 if (requestedDownload.isEmpty()) {
 987                         /* this seems wrong. */
 988                         logger.warn("Download finished but could not be located.");
 989                         return;
 990                 }
 991                 Download download = requestedDownload.iterator().next();
 992
 993                 try {
 994                         Closeables.close(download.outputStream(), true);
 995                         eventBus.post(new DownloadFailed(download));
 996                         dccReceivers.remove(dccDownloadFailed.dccReceiver());
 997                         downloads.removeAll(download.pack().name());
 998                 } catch (IOException ioe1) {
 999                         /* swallow silently. */
1000                 }
1001         }
1002
1003         @Subscribe
1004         public void replyReceived(ReplyReceived replyReceived) {
1005                 logger.trace(String.format("%s: %s", replyReceived.connection().hostname(), replyReceived.reply()));
1006         }
1007
1008         //
1009         // PRIVATE METHODS
1010         //
1011
1012         /**
1013          * Returns the download of the given pack from the given bot.
1014          *
1015          * @param pack
1016          *              The pack being downloaded
1017          * @param bot
1018          *              The bot the pack is being downloaded from
1019          * @return The download, or {@link Optional#absent()} if the download could not
1020          *         be found
1021          */
1022         private Optional<Download> getDownload(Pack pack, Bot bot) {
1023                 if (!downloads.containsKey(pack.name())) {
1024                         return Optional.absent();
1025                 }
1026                 for (Download download : Lists.newArrayList(downloads.get(pack.name()))) {
1027                         if (download.bot().equals(bot)) {
1028                                 return Optional.of(download);
1029                         }
1030                 }
1031                 return Optional.absent();
1032         }
1033
1034         /**
1035          * Searches all current connections for the given connection, returning the
1036          * associated network.
1037          *
1038          * @param connection
1039          *              The connection to get the network for
1040          * @return The network belonging to the connection, or {@link
1041          *         Optional#absent()}
1042          */
1043         private Optional<Network> getNetwork(Connection connection) {
1044                 for (Entry<Network, Connection> networkConnectionEntry : networkConnections.entrySet()) {
1045                         if (networkConnectionEntry.getValue().equals(connection)) {
1046                                 return Optional.of(networkConnectionEntry.getKey());
1047                         }
1048                 }
1049                 return Optional.absent();
1050         }
1051
1052         /**
1053          * Returns the configured channel for the given network and name.
1054          *
1055          * @param network
1056          *              The network the channel is located on
1057          * @param channelName
1058          *              The name of the channel
1059          * @return The configured channel, or {@link Optional#absent()} if no
1060          *         configured channel matching the given network and name was found
1061          */
1062         public Optional<Channel> getChannel(Network network, String channelName) {
1063                 for (Channel channel : channels) {
1064                         if (channel.network().equals(network) && (channel.name().equalsIgnoreCase(channelName))) {
1065                                 return Optional.of(channel);
1066                         }
1067                 }
1068                 return Optional.absent();
1069         }
1070
1071         /**
1072          * Returns the extra channel for the given network and name.
1073          *
1074          * @param network
1075          *              The network the channel is located on
1076          * @param channelName
1077          *              The name of the channel
1078          * @return The extra channel, or {@link Optional#absent()} if no extra channel
1079          *         matching the given network and name was found
1080          */
1081         public Optional<Channel> getExtraChannel(Network network, String channelName) {
1082                 for (Channel channel : extraChannels) {
1083                         if (channel.network().equals(network) && (channel.name().equalsIgnoreCase(channelName))) {
1084                                 return Optional.of(channel);
1085                         }
1086                 }
1087                 return Optional.absent();
1088         }
1089
1090         /**
1091          * Parses {@link Pack} information from the given message.
1092          *
1093          * @param message
1094          *              The message to parse pack information from
1095          * @return The parsed pack, or {@link Optional#absent()} if the message could
1096          *         not be parsed into a pack
1097          */
1098         private Optional<Pack> parsePack(String message) {
1099                 int squareOpen = message.indexOf('[');
1100                 int squareClose = message.indexOf(']', squareOpen);
1101                 if ((squareOpen == -1) && (squareClose == -1)) {
1102                         return Optional.absent();
1103                 }
1104                 String packSize = message.substring(squareOpen + 1, squareClose);
1105                 String packName = message.substring(message.lastIndexOf(' ') + 1);
1106                 String packIndex = message.substring(0, message.indexOf(' ')).substring(1);
1107                 return Optional.of(new Pack(packIndex, packSize, packName));
1108         }
1109
1110 }