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