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