src/main/java/net/pterodactylus/xdcc/core/Core.java

   1 /*
   2  * XdccDownloader - Core.java - Copyright © 2013 David Roden
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 package net.pterodactylus.xdcc.core;
  19
  20 import static java.lang.String.format;
  21 import static net.pterodactylus.irc.event.ChannelNotJoined.Reason.banned;
  22 import static net.pterodactylus.irc.event.ChannelNotJoined.Reason.registeredNicknamesOnly;
  23 import static net.pterodactylus.irc.util.MessageCleaner.getDefaultInstance;
  24 import static net.pterodactylus.xdcc.data.Channel.TO_NETWORK;
  25 import static net.pterodactylus.xdcc.data.Download.FILTER_RUNNING;
  26
  27 import java.io.File;
  28 import java.io.FileNotFoundException;
  29 import java.io.FileOutputStream;
  30 import java.io.IOException;
  31 import java.io.OutputStream;
  32 import java.util.Collection;
  33 import java.util.Collections;
  34 import java.util.Iterator;
  35 import java.util.List;
  36 import java.util.Map;
  37 import java.util.Map.Entry;
  38 import java.util.concurrent.TimeUnit;
  39 import java.util.stream.Collectors;
  40
  41 import net.pterodactylus.irc.Connection;
  42 import net.pterodactylus.irc.ConnectionFactory;
  43 import net.pterodactylus.irc.DccReceiver;
  44 import net.pterodactylus.irc.DefaultConnection;
  45 import net.pterodactylus.irc.event.ChannelJoined;
  46 import net.pterodactylus.irc.event.ChannelLeft;
  47 import net.pterodactylus.irc.event.ChannelMessageReceived;
  48 import net.pterodactylus.irc.event.ChannelNotJoined;
  49 import net.pterodactylus.irc.event.ClientQuit;
  50 import net.pterodactylus.irc.event.ConnectionClosed;
  51 import net.pterodactylus.irc.event.ConnectionEstablished;
  52 import net.pterodactylus.irc.event.ConnectionFailed;
  53 import net.pterodactylus.irc.event.DccAcceptReceived;
  54 import net.pterodactylus.irc.event.DccDownloadFailed;
  55 import net.pterodactylus.irc.event.DccDownloadFinished;
  56 import net.pterodactylus.irc.event.DccSendReceived;
  57 import net.pterodactylus.irc.event.KickedFromChannel;
  58 import net.pterodactylus.irc.event.NicknameChanged;
  59 import net.pterodactylus.irc.event.PrivateMessageReceived;
  60 import net.pterodactylus.irc.event.PrivateNoticeReceived;
  61 import net.pterodactylus.irc.event.ReplyReceived;
  62 import net.pterodactylus.irc.util.RandomNickname;
  63 import net.pterodactylus.xdcc.core.event.BotAdded;
  64 import net.pterodactylus.xdcc.core.event.CoreStarted;
  65 import net.pterodactylus.xdcc.core.event.DownloadFailed;
  66 import net.pterodactylus.xdcc.core.event.DownloadFinished;
  67 import net.pterodactylus.xdcc.core.event.DownloadStarted;
  68 import net.pterodactylus.xdcc.core.event.GenericError;
  69 import net.pterodactylus.xdcc.core.event.GenericMessage;
  70 import net.pterodactylus.xdcc.core.event.MessageReceived;
  71 import net.pterodactylus.xdcc.data.Bot;
  72 import net.pterodactylus.xdcc.data.Channel;
  73 import net.pterodactylus.xdcc.data.ConnectedNetwork;
  74 import net.pterodactylus.xdcc.data.Download;
  75 import net.pterodactylus.xdcc.data.Network;
  76 import net.pterodactylus.xdcc.data.Pack;
  77 import net.pterodactylus.xdcc.data.Server;
  78
  79 import com.google.common.base.Optional;
  80 import com.google.common.base.Predicate;
  81 import com.google.common.collect.FluentIterable;
  82 import com.google.common.collect.HashBasedTable;
  83 import com.google.common.collect.HashMultimap;
  84 import com.google.common.collect.ImmutableList;
  85 import com.google.common.collect.ImmutableSet;
  86 import com.google.common.collect.Lists;
  87 import com.google.common.collect.Maps;
  88 import com.google.common.collect.Multimap;
  89 import com.google.common.collect.Sets;
  90 import com.google.common.collect.Table;
  91 import com.google.common.eventbus.EventBus;
  92 import com.google.common.eventbus.Subscribe;
  93 import com.google.common.io.Closeables;
  94 import com.google.common.util.concurrent.AbstractExecutionThreadService;
  95 import com.google.inject.Inject;
  96 import org.apache.log4j.Logger;
  97
  98 /**
  99  * The core of XDCC Downloader.
 100  *
 101  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
 102  */
 103 public class Core extends AbstractExecutionThreadService {
 104
 105         /** The logger. */
 106         private static final Logger logger = Logger.getLogger(Core.class.getName());
 107
 108         /** The event bus. */
 109         private final EventBus eventBus;
 110         private final ConnectionFactory connectionFactory;
 111         private final ChannelBanManager channelBanManager =
 112                         new ChannelBanManager();
 113
 114         /** The temporary directory to download files to. */
 115         private final String temporaryDirectory;
 116
 117         /** The directory to move finished downloads to. */
 118         private final String finalDirectory;
 119
 120         /** The channels that should be monitored. */
 121         private final Collection<Channel> channels = Sets.newHashSet();
 122
 123         /** The channels that are currentlymonitored. */
 124         private final Collection<Channel> joinedChannels = Sets.newHashSet();
 125
 126         /** The channels that are joined but not configured. */
 127         private final Collection<Channel> extraChannels = Sets.newHashSet();
 128
 129         /** The current network connections. */
 130         private final Map<Network, Connection> networkConnections = Collections.synchronizedMap(Maps.<Network, Connection>newHashMap());
 131
 132         /** The currently known bots. */
 133         private final Table<Network, String, Bot> networkBots = HashBasedTable.create();
 134
 135         /** The current downloads. */
 136         private final Multimap<String, Download> downloads = HashMultimap.create();
 137
 138         /** The current DCC receivers. */
 139         private final Collection<DccReceiver> dccReceivers = Lists.newArrayList();
 140
 141         /**
 142          * Creates a new core.
 143          *
 144          * @param eventBus
 145          *              The event bus
 146          * @param temporaryDirectory
 147          *              The directory to download files to
 148          * @param finalDirectory
 149          *              The directory to move finished files to
 150          */
 151         @Inject
 152         public Core(EventBus eventBus, ConnectionFactory connectionFactory, String temporaryDirectory, String finalDirectory) {
 153                 this.eventBus = eventBus;
 154                 this.connectionFactory = connectionFactory;
 155                 this.temporaryDirectory = temporaryDirectory;
 156                 this.finalDirectory = finalDirectory;
 157         }
 158
 159         //
 160         // ACCESSORS
 161         //
 162
 163         /**
 164          * Returns all currently known connections.
 165          *
 166          * @return All currently known connections
 167          */
 168         public Collection<Connection> connections() {
 169                 return networkConnections.values();
 170         }
 171
 172         /**
 173          * Returns all defined networks.
 174          *
 175          * @return All defined networks
 176          */
 177         public Collection<Network> networks() {
 178                 return FluentIterable.from(channels).transform(TO_NETWORK).toSet();
 179         }
 180
 181         /**
 182          * Returns all connected networks.
 183          *
 184          * @return All connected networks
 185          */
 186         public Collection<ConnectedNetwork> connectedNetworks() {
 187                 return networkConnections.entrySet().stream().map((entry) -> {
 188                         Network network = entry.getKey();
 189                         Collection<Bot> bots = networkBots.row(network).values();
 190                         int packCount = bots.stream().mapToInt((bot) -> bot.packs().size()).reduce((a, b) -> a + b).orElse(0);
 191                         return new ConnectedNetwork(network, entry.getValue().hostname(),
 192                                         entry.getValue().port(), entry.getValue().nickname(),
 193                                         channels.stream()
 194                                                         .filter((channel) -> channel.network()
 195                                                                         .equals(network))
 196                                                         .map(Channel::name)
 197                                                         .collect(Collectors.<String>toList()),
 198                                         extraChannels.stream()
 199                                                         .filter((channel) -> channel.network()
 200                                                                         .equals(network))
 201                                                         .map(Channel::name)
 202                                                         .collect(Collectors.<String>toList()),
 203                                         bots.size(), packCount);
 204                 }).collect(Collectors.<ConnectedNetwork>toList());
 205         }
 206
 207         /**
 208          * Returns all configured channels. Due to various circumstances, configured
 209          * channels might not actually be joined.
 210          *
 211          * @return All configured channels
 212          */
 213         public Collection<Channel> channels() {
 214                 return ImmutableSet.copyOf(channels);
 215         }
 216
 217         /**
 218          * Returns all currently joined channels.
 219          *
 220          * @return All currently joined channels
 221          */
 222         public Collection<Channel> joinedChannels() {
 223                 return ImmutableSet.copyOf(joinedChannels);
 224         }
 225
 226         /**
 227          * Returns all currently joined channels that are not configured.
 228          *
 229          * @return All currently joined but not configured channels
 230          */
 231         public Collection<Channel> extraChannels() {
 232                 return ImmutableSet.copyOf(extraChannels);
 233         }
 234
 235         /**
 236          * Returns all currently known bots.
 237          *
 238          * @return All currently known bots
 239          */
 240         public Collection<Bot> bots() {
 241                 return networkBots.values();
 242         }
 243
 244         /**
 245          * Returns all currently running downloads.
 246          *
 247          * @return All currently running downloads
 248          */
 249         public Collection<Download> downloads() {
 250                 return downloads.values();
 251         }
 252
 253         //
 254         // ACTIONS
 255         //
 256
 257         /**
 258          * Adds a channel to monitor.
 259          *
 260          * @param channel
 261          *              The channel to monitor
 262          */
 263         public void addChannel(Channel channel) {
 264                 channels.add(channel);
 265         }
 266
 267         /**
 268          * Fetches the given pack from the given bot.
 269          *
 270          * @param bot
 271          *              The bot to fetch the pack from
 272          * @param pack
 273          *              The pack to fetch
 274          */
 275         public void fetch(Bot bot, Pack pack) {
 276                 Connection connection = networkConnections.get(bot.network());
 277                 if (connection == null) {
 278                         return;
 279                 }
 280
 281                 /* check if we are already downloading the file? */
 282                 if (downloads.containsKey(pack.name())) {
 283                         Collection<Download> packDownloads = downloads.get(pack.name());
 284                         Collection<Download> runningDownloads = FluentIterable.from(packDownloads).filter(FILTER_RUNNING).toSet();
 285                         if (!runningDownloads.isEmpty()) {
 286                                 Download download = runningDownloads.iterator().next();
 287                                 eventBus.post(new GenericMessage(String.format("File %s is already downloading from %s (%s).", pack.name(), download.bot().name(), download.bot().network().name())));
 288                                 return;
 289                         }
 290                         StringBuilder bots = new StringBuilder();
 291                         for (Download download : packDownloads) {
 292                                 if (bots.length() > 0) {
 293                                         bots.append(", ");
 294                                 }
 295                                 bots.append(download.bot().name()).append(" (").append(download.bot().network().name()).append(')');
 296                         }
 297                         eventBus.post(new GenericMessage(String.format("File %s is already requested from %d bots (%s).", pack.name(), packDownloads.size(), bots.toString())));
 298                 }
 299
 300                 Download download = new Download(bot, pack);
 301                 downloads.put(pack.name(), download);
 302
 303                 try {
 304                         connection.sendMessage(bot.name(), "XDCC SEND " + pack.id());
 305                 } catch (IOException ioe1) {
 306                         logger.warn("Could not send message to bot!", ioe1);
 307                 }
 308         }
 309
 310         /**
 311          * Cancels the download of the given pack from the given bot.
 312          *
 313          * @param bot
 314          *              The bot the pack is being downloaded from
 315          * @param pack
 316          *              The pack being downloaded
 317          */
 318         public void cancelDownload(Bot bot, Pack pack) {
 319                 Optional<Download> download = getDownload(pack, bot);
 320                 if (!download.isPresent()) {
 321                         return;
 322                 }
 323
 324                 /* get connection. */
 325                 Connection connection = networkConnections.get(bot.network());
 326                 if (connection == null) {
 327                         /* request for unknown network? */
 328                         return;
 329                 }
 330
 331                 /* stop the DCC receiver. */
 332                 if (download.get().dccReceiver() != null) {
 333                         download.get().dccReceiver().stop();
 334                 } else {
 335                         /* remove download if it hasn’t started yet. */
 336                         downloads.remove(pack.name(), download.get());
 337                 }
 338
 339                 /* remove the request from the bot, too. */
 340                 try {
 341                         connection.sendMessage(bot.name(), String.format("XDCC %s", (download.get().dccReceiver() != null) ? "CANCEL" : "REMOVE"));
 342                 } catch (IOException ioe1) {
 343                         logger.warn(String.format("Could not cancel DCC from %s (%s)!", bot.name(), bot.network().name()), ioe1);
 344                 }
 345         }
 346
 347         /**
 348          * Closes the given connection.
 349          *
 350          * @param connection
 351          *              The connection to close
 352          */
 353         public void closeConnection(Connection connection) {
 354                 try {
 355                         connection.close();
 356                 } catch (IOException ioe1) {
 357                         /* TODO */
 358                 }
 359         }
 360
 361         //
 362         // ABSTRACTIDLESERVICE METHODS
 363         //
 364
 365         @Override
 366         protected void startUp() {
 367                 for (Channel channel : channels) {
 368                         logger.info(String.format("Connecting to Channel %s on Network %s…", channel.name(), channel.network().name()));
 369                         connectNetwork(channel.network());
 370                 }
 371
 372                 /* notify listeners. */
 373                 eventBus.post(new CoreStarted(this));
 374         }
 375
 376         @Override
 377         protected void run() throws Exception {
 378                 while (isRunning()) {
 379                         try {
 380                                 Thread.sleep(TimeUnit.MINUTES.toMillis(1));
 381                         } catch (InterruptedException ie1) {
 382                                 /* ignore. */
 383                         }
 384
 385                         /* find channels that should be monitored but are not. */
 386                         for (Channel channel : channels) {
 387                                 if (joinedChannels.contains(channel)) {
 388                                         continue;
 389                                 }
 390
 391                                 /* are we banned from this channel? */
 392                                 if (channelBanManager.isBanned(channel)) {
 393                                         continue;
 394                                 }
 395
 396                                 connectNetwork(channel.network());
 397                                 Connection connection = networkConnections.get(channel.network());
 398                                 if (connection.established()) {
 399                                         eventBus.post(new GenericMessage(String.format("Trying to join %s on %s.", channel.name(), channel.network().name())));
 400                                         try {
 401                                                 connection.joinChannel(channel.name());
 402                                         } catch (IOException ioe1) {
 403                                                 eventBus.post(new GenericMessage(String.format("Could not join %s on %s.", channel.name(), channel.network().name())));
 404                                         }
 405                                 }
 406                         }
 407                 }
 408         }
 409
 410         @Override
 411         protected void shutDown() {
 412         }
 413
 414         //
 415         // PRIVATE METHODS
 416         //
 417
 418         /**
 419          * Starts a new connection for the given network if no such connection exists
 420          * already.
 421          *
 422          * @param network
 423          *              The network to connect to
 424          */
 425         private void connectNetwork(Network network) {
 426                 if (!networkConnections.containsKey(network)) {
 427                                 /* select a random server. */
 428                         List<Server> servers = Lists.newArrayList(network.servers());
 429                         if (servers.isEmpty()) {
 430                                 eventBus.post(new GenericError(String.format("Network %s does not have any servers.", network.name())));
 431                                 return;
 432                         }
 433                         Server server = servers.get((int) (Math.random() * servers.size()));
 434                         Connection connection = connectionFactory.createConnection(server.hostname(),
 435                                         server.unencryptedPorts().iterator().next());
 436                         connection.username(RandomNickname.get()).realName(RandomNickname.get());
 437                         networkConnections.put(network, connection);
 438                         connection.open();
 439                 }
 440         }
 441
 442         /**
 443          * Removes the given connection and all its channels and bots.
 444          *
 445          * @param connection
 446          *              The connection to remove
 447          */
 448         private void removeConnection(Connection connection) {
 449                 Optional<Network> network = getNetwork(connection);
 450                 if (!network.isPresent()) {
 451                         return;
 452                 }
 453                 if (!connection.established()) {
 454                         return;
 455                 }
 456
 457                 /* find all channels that need to be removed. */
 458                 for (Collection<Channel> channels : ImmutableList.of(joinedChannels, extraChannels)) {
 459                         for (Iterator<Channel> channelIterator = channels.iterator(); channelIterator.hasNext(); ) {
 460                                 Channel joinedChannel = channelIterator.next();
 461                                 if (!joinedChannel.network().equals(network.get())) {
 462                                         continue;
 463                                 }
 464
 465                                 channelIterator.remove();
 466                         }
 467                 }
 468
 469                 /* now remove all bots for that network. */
 470                 Map<String, Bot> bots = networkBots.row(network.get());
 471                 int botCount = bots.size();
 472                 int packCount = 0;
 473                 for (Bot bot : bots.values()) {
 474                         packCount += bot.packs().size();
 475                 }
 476                 bots.clear();
 477                 eventBus.post(new GenericMessage(String.format("Network %s disconnected, %d bots removed, %d packs removed.", network.get().name(), botCount, packCount)));
 478
 479                 /* now remove the network. */
 480                 networkConnections.remove(network.get());
 481         }
 482
 483         //
 484         // EVENT HANDLERS
 485         //
 486
 487         /**
 488          * If a connection to a network has been established, the channels associated
 489          * with this network are joined.
 490          *
 491          * @param connectionEstablished
 492          *              The connection established event
 493          */
 494         @Subscribe
 495         public void connectionEstablished(ConnectionEstablished connectionEstablished) {
 496
 497                 /* get network for connection. */
 498                 Optional<Network> network = getNetwork(connectionEstablished.connection());
 499
 500                 /* found network? */
 501                 if (!network.isPresent()) {
 502                         eventBus.post(new GenericMessage(String.format("Connected to unknown network: %s", connectionEstablished.connection().hostname())));
 503                         return;
 504                 }
 505
 506                 eventBus.post(new GenericMessage(String.format("Connected to network %s.", network.get().name())));
 507
 508                 /* join all channels on this network. */
 509                 for (Channel channel : channels) {
 510                         if (channel.network().equals(network.get())) {
 511                                 try {
 512                                         eventBus.post(new GenericMessage(String.format("Trying to join %s on %s...", channel.name(), network.get().name())));
 513                                         connectionEstablished.connection().joinChannel(channel.name());
 514                                 } catch (IOException ioe1) {
 515                                         logger.warn(String.format("Could not join %s on %s!", channel.name(), network.get().name()), ioe1);
 516                                 }
 517                         }
 518                 }
 519         }
 520
 521         /**
 522          * Remove all data stored for a network if the connection is closed.
 523          *
 524          * @param connectionClosed
 525          *              The connection closed event
 526          */
 527         @Subscribe
 528         public void connectionClosed(ConnectionClosed connectionClosed) {
 529                 removeConnection(connectionClosed.connection());
 530         }
 531
 532         /**
 533          * Remove all data stored for a network if the connection fails.
 534          *
 535          * @param connectionFailed
 536          *              The connection failed event
 537          */
 538         @Subscribe
 539         public void connectionFailed(ConnectionFailed connectionFailed) {
 540                 removeConnection(connectionFailed.connection());
 541         }
 542
 543         /**
 544          * Shows a message when a channel was joined by us.
 545          *
 546          * @param channelJoined
 547          *              The channel joined event
 548          */
 549         @Subscribe
 550         public void channelJoined(ChannelJoined channelJoined) {
 551                 if (channelJoined.connection().isSource(channelJoined.client())) {
 552                         Optional<Network> network = getNetwork(channelJoined.connection());
 553                         if (!network.isPresent()) {
 554                                 return;
 555                         }
 556
 557                         Optional<Channel> channel = getChannel(network.get(), channelJoined.channel());
 558                         if (!channel.isPresent()) {
 559                                 /* it’s an extra channel. */
 560                                 extraChannels.add(new Channel(network.get(), channelJoined.channel()));
 561                                 logger.info(String.format("Joined extra Channel %s on %s.", channelJoined.channel(), network.get().name()));
 562                                 return;
 563                         }
 564
 565                         channelBanManager.unban(channel.get());
 566                         joinedChannels.add(channel.get());
 567                         logger.info(String.format("Joined Channel %s on %s.", channelJoined.channel(), network.get().name()));
 568                 }
 569         }
 570
 571         @Subscribe
 572         public void channelNotJoined(ChannelNotJoined channelNotJoined) {
 573                 Optional<Network> network = getNetwork(channelNotJoined.connection());
 574                 if (!network.isPresent()) {
 575                         return;
 576                 }
 577
 578                 Optional<Channel> channel = getChannel(network.get(), channelNotJoined.channel());
 579                 if (!channel.isPresent()) {
 580                         eventBus.post(new GenericMessage(format("Could not join %s but didn’t try to join, either.", channel.get())));
 581                         return;
 582                 }
 583
 584                 /* remove all bots for this channel, we might have been kicked. */
 585                 Collection<Bot> botsToRemove = networkBots.row(network.get())
 586                                 .values().stream()
 587                                 .filter(bot -> bot.channel()
 588                                                 .equalsIgnoreCase(channel.get().name()))
 589                                 .collect(Collectors.toSet());
 590                 botsToRemove.stream()
 591                                 .forEach(bot -> networkBots.row(network.get())
 592                                                 .remove(bot.name()));
 593
 594                 if (channelNotJoined.reason() == registeredNicknamesOnly) {
 595                         channels.remove(channel.get());
 596                         eventBus.post(new GenericMessage(
 597                                         format("Not trying to join %s anymore.", channel.get())));
 598                         return;
 599                 }
 600                 if (channelNotJoined.reason() == banned) {
 601                         channelBanManager.ban(channel.get());
 602                         eventBus.post(new GenericMessage(
 603                                         format("Banned from %s, suspending join for a day.",
 604                                                         channel.get())));
 605                         return;
 606                 }
 607
 608                 eventBus.post(new GenericMessage(
 609                                 format("Could not join %s: %s", channelNotJoined.channel(),
 610                                                 channelNotJoined.reason())));
 611         }
 612
 613         /**
 614          * Removes bots that leave a channel, or channels when it’s us that’s leaving.
 615          *
 616          * @param channelLeft
 617          *              The channel left event
 618          */
 619         @Subscribe
 620         public void channelLeft(ChannelLeft channelLeft) {
 621                 Optional<Network> network = getNetwork(channelLeft.connection());
 622                 if (!network.isPresent()) {
 623                         return;
 624                 }
 625
 626                 Bot bot = networkBots.get(network.get(), channelLeft.client().nick().get());
 627                 if (bot == null) {
 628                         /* maybe it was us? */
 629                         if (channelLeft.connection().isSource(channelLeft.client())) {
 630                                 Optional<Channel> channel = getChannel(network.get(), channelLeft.channel());
 631                                 if (!channel.isPresent()) {
 632                                         /* maybe it was an extra channel? */
 633                                         channel = getExtraChannel(network.get(), channelLeft.channel());
 634                                         if (!channel.isPresent()) {
 635                                                 /* okay, whatever. */
 636                                                 return;
 637                                         }
 638
 639                                         extraChannels.remove(channel);
 640                                 } else {
 641                                         channels.remove(channel.get());
 642                                 }
 643
 644                                 eventBus.post(new GenericMessage(String.format("Left Channel %s on %s.", channel.get().name(), channel.get().network().name())));
 645                         }
 646
 647                         return;
 648                 }
 649
 650                 networkBots.remove(network.get(), channelLeft.client().nick().get());
 651         }
 652
 653         @Subscribe
 654         public void kickedFromChannel(KickedFromChannel kickedFromChannel) {
 655                 Optional<Network> network = getNetwork(kickedFromChannel.connection());
 656                 if (!network.isPresent()) {
 657                         return;
 658                 }
 659
 660                 /* have we been kicked? */
 661                 if (nicknameMatchesConnection(kickedFromChannel.connection(), kickedFromChannel.kickee())) {
 662                         Optional<Channel> channel = getChannel(network.get(), kickedFromChannel.channel());
 663                         if (!channel.isPresent()) {
 664                                 /* maybe it was an extra channel? */
 665                                 channel = getExtraChannel(network.get(), kickedFromChannel.channel());
 666                                 if (!channel.isPresent()) {
 667                                         /* okay, whatever. */
 668                                         return;
 669                                 }
 670
 671                                 extraChannels.remove(channel);
 672                         } else {
 673                                 channels.remove(channel.get());
 674                         }
 675                         eventBus.post(new GenericMessage(format(
 676                                         "Kicked from %s by %s: %s",
 677                                         kickedFromChannel.channel(),
 678                                         kickedFromChannel.kicker(),
 679                                         kickedFromChannel.reason().or("<unknown>")
 680                         )));
 681                 }
 682         }
 683
 684         private boolean nicknameMatchesConnection(Connection connection, String nickname) {
 685                 return connection.nickname().equalsIgnoreCase(nickname);
 686         }
 687
 688         /**
 689          * Removes a client (which may be a bot) from the table of known bots.
 690          *
 691          * @param clientQuit
 692          *              The client quit event
 693          */
 694         @Subscribe
 695         public void clientQuit(ClientQuit clientQuit) {
 696                 Optional<Network> network = getNetwork(clientQuit.connection());
 697                 if (!network.isPresent()) {
 698                         return;
 699                 }
 700
 701                 networkBots.remove(network.get(), clientQuit.client().nick().get());
 702         }
 703
 704         /**
 705          * If the nickname of a bit changes, remove it from the old name and store it
 706          * under the new name.
 707          *
 708          * @param nicknameChanged
 709          *              The nickname changed event
 710          */
 711         @Subscribe
 712         public void nicknameChanged(NicknameChanged nicknameChanged) {
 713                 Optional<Network> network = getNetwork(nicknameChanged.connection());
 714                 if (!network.isPresent()) {
 715                         return;
 716                 }
 717
 718                 Bot bot = networkBots.remove(network.get(), nicknameChanged.client().nick().get());
 719                 if (bot == null) {
 720                         return;
 721                 }
 722
 723                 networkBots.put(network.get(), nicknameChanged.newNickname(), bot);
 724         }
 725
 726         /**
 727          * If a message on a channel is received, it is parsed for pack information
 728          * with is then added to a bot.
 729          *
 730          * @param channelMessageReceived
 731          *              The channel message received event
 732          */
 733         @Subscribe
 734         public void channelMessageReceived(ChannelMessageReceived channelMessageReceived) {
 735                 String message = getDefaultInstance().clean(channelMessageReceived.message());
 736                 if (!message.startsWith("#")) {
 737                         /* most probably not a pack announcement. */
 738                         return;
 739                 }
 740
 741                 Optional<Network> network = getNetwork(channelMessageReceived.connection());
 742                 if (!network.isPresent()) {
 743                         /* message for unknown connection? */
 744                         return;
 745                 }
 746
 747                 /* parse pack information. */
 748                 Optional<Pack> pack = parsePack(message);
 749                 if (!pack.isPresent()) {
 750                         return;
 751                 }
 752
 753                 Bot bot;
 754                 synchronized (networkBots) {
 755                         if (!networkBots.contains(network.get(), channelMessageReceived.source().nick().get())) {
 756                                 bot = new Bot(network.get(), channelMessageReceived.channel(),
 757                                                 channelMessageReceived.source().nick().get());
 758                                 networkBots.put(network.get(), channelMessageReceived.source().nick().get(), bot);
 759                                 eventBus.post(new BotAdded(bot));
 760                         } else {
 761                                 bot = networkBots.get(network.get(), channelMessageReceived.source().nick().get());
 762                         }
 763                 }
 764
 765                 /* add pack. */
 766                 bot.addPack(pack.get());
 767                 logger.debug(String.format("Bot %s now has %d packs.", bot, bot.packs().size()));
 768         }
 769
 770         /**
 771          * Forward all private messages to every console.
 772          *
 773          * @param privateMessageReceived
 774          *              The private message recevied event
 775          */
 776         @Subscribe
 777         public void privateMessageReceived(PrivateMessageReceived privateMessageReceived) {
 778                 eventBus.post(new MessageReceived(privateMessageReceived.source(), privateMessageReceived.message()));
 779         }
 780
 781         /**
 782          * Sends a message to all console when a notice was received.
 783          *
 784          * @param privateNoticeReceived
 785          *              The notice received event
 786          */
 787         @Subscribe
 788         public void privateNoticeReceived(PrivateNoticeReceived privateNoticeReceived) {
 789                 Optional<Network> network = getNetwork(privateNoticeReceived.connection());
 790                 if (!network.isPresent()) {
 791                         return;
 792                 }
 793
 794                 eventBus.post(new GenericMessage(String.format("Notice from %s (%s): %s", privateNoticeReceived.source(), network.get(), privateNoticeReceived.text())));
 795         }
 796
 797         /**
 798          * Starts a DCC download.
 799          *
 800          * @param dccSendReceived
 801          *              The DCC SEND event
 802          */
 803         @Subscribe
 804         public void dccSendReceived(final DccSendReceived dccSendReceived) {
 805                 final Optional<Network> network = getNetwork(dccSendReceived.connection());
 806                 if (!network.isPresent()) {
 807                         return;
 808                 }
 809
 810                 Collection<Download> packDownloads = downloads.get(dccSendReceived.filename());
 811                 if (packDownloads.isEmpty()) {
 812                         /* unknown download, ignore. */
 813                         return;
 814                 }
 815
 816                 /* check if it’s already downloading. */
 817                 Collection<Download> runningDownloads = FluentIterable.from(packDownloads).filter(FILTER_RUNNING).toSet();
 818                 if (!runningDownloads.isEmpty()) {
 819                         eventBus.post(new GenericMessage(String.format("Ignoring offer for %s, it’s already being downloaded.", dccSendReceived.filename())));
 820                         return;
 821                 }
 822
 823                 /* locate the correct download. */
 824                 Collection<Download> requestedDownload = FluentIterable.from(packDownloads).filter(new Predicate<Download>() {
 825
 826                         @Override
 827                         public boolean apply(Download download) {
 828                                 return download.bot().network().equals(network.get()) && download.bot().name().equalsIgnoreCase(dccSendReceived.source().nick().get());
 829                         }
 830                 }).toSet();
 831
 832                 /* we did not request this download. */
 833                 if (requestedDownload.isEmpty()) {
 834                         return;
 835                 }
 836
 837                 Download download = requestedDownload.iterator().next();
 838
 839                 /* check if the file already exists. */
 840                 File outputFile = new File(temporaryDirectory, dccSendReceived.filename());
 841                 if (outputFile.exists()) {
 842                         long existingFileSize = outputFile.length();
 843
 844                         /* file already complete? */
 845                         if ((dccSendReceived.filesize() > -1) && (existingFileSize >= dccSendReceived.filesize())) {
 846                                 /* file is apparently already complete. just move it. */
 847                                 if (outputFile.renameTo(new File(finalDirectory, download.pack().name()))) {
 848                                         eventBus.post(new GenericMessage(String.format("File %s already downloaded.", download.pack().name())));
 849                                 } else {
 850                                         eventBus.post(new GenericMessage(String.format("File %s already downloaded but not moved to %s.", download.pack().name(), finalDirectory)));
 851                                 }
 852
 853                                 /* remove download. */
 854                                 downloads.removeAll(download.pack().name());
 855                                 return;
 856                         }
 857
 858                         /* file not complete yet, DCC resume it. */
 859                         try {
 860                                 download.remoteAddress(dccSendReceived.inetAddress()).filesize(dccSendReceived.filesize());
 861                                 dccSendReceived.connection().sendDccResume(dccSendReceived.source().nick().get(), dccSendReceived.filename(), dccSendReceived.port(), existingFileSize);
 862                         } catch (IOException ioe1) {
 863                                 eventBus.post(new GenericError(String.format("Could not send DCC RESUME %s to %s (%s).", dccSendReceived.filename(), dccSendReceived.source().nick().get(), ioe1.getMessage())));
 864                         }
 865
 866                         return;
 867                 }
 868
 869                 /* file does not exist, start the download. */
 870                 try {
 871                         OutputStream fileOutputStream = new FileOutputStream(outputFile);
 872                         DccReceiver dccReceiver = new DccReceiver(eventBus, dccSendReceived.inetAddress(), dccSendReceived.port(), dccSendReceived.filename(), dccSendReceived.filesize(), fileOutputStream);
 873                         download.filename(outputFile.getPath()).outputStream(fileOutputStream).dccReceiver(dccReceiver);
 874                         dccReceivers.add(dccReceiver);
 875                         dccReceiver.start();
 876                         eventBus.post(new DownloadStarted(download));
 877                 } catch (FileNotFoundException fnfe1) {
 878                         eventBus.post(new GenericError(String.format("Could not start download of %s from %s (%s).", dccSendReceived.filename(), dccSendReceived.source().nick().get(), fnfe1.getMessage())));
 879                 }
 880         }
 881
 882         @Subscribe
 883         public void dccAcceptReceived(final DccAcceptReceived dccAcceptReceived) {
 884                 final Optional<Network> network = getNetwork(dccAcceptReceived.connection());
 885                 if (!network.isPresent()) {
 886                         return;
 887                 }
 888
 889                 Collection<Download> packDownloads = downloads.get(dccAcceptReceived.filename());
 890                 if (packDownloads.isEmpty()) {
 891                         /* unknown download, ignore. */
 892                         return;
 893                 }
 894
 895                 /* check if it’s already downloading. */
 896                 Collection<Download> runningDownloads = FluentIterable.from(packDownloads).filter(FILTER_RUNNING).toSet();
 897                 if (!runningDownloads.isEmpty()) {
 898                         eventBus.post(new GenericMessage(String.format("Ignoring offer for %s, it’s already being downloaded.", dccAcceptReceived.filename())));
 899                         return;
 900                 }
 901
 902                 /* locate the correct download. */
 903                 Collection<Download> requestedDownload = FluentIterable.from(packDownloads).filter(new Predicate<Download>() {
 904
 905                         @Override
 906                         public boolean apply(Download download) {
 907                                 return download.bot().network().equals(network.get()) && download.bot().name().equalsIgnoreCase(dccAcceptReceived.source().nick().get());
 908                         }
 909                 }).toSet();
 910
 911                 /* we did not request this download. */
 912                 if (requestedDownload.isEmpty()) {
 913                         return;
 914                 }
 915
 916                 Download download = requestedDownload.iterator().next();
 917
 918                 try {
 919                         File outputFile = new File(temporaryDirectory, dccAcceptReceived.filename());
 920                         if (outputFile.length() != dccAcceptReceived.position()) {
 921                                 eventBus.post(new GenericError(String.format("Download %s from %s does not start at the right position!")));
 922                                 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()));
 923
 924                                 downloads.removeAll(download.pack().name());
 925                                 return;
 926                         }
 927                         OutputStream outputStream = new FileOutputStream(outputFile, true);
 928                         DccReceiver dccReceiver = new DccReceiver(eventBus, download.remoteAddress(), dccAcceptReceived.port(), dccAcceptReceived.filename(), dccAcceptReceived.position(), download.filesize(), outputStream);
 929                         download.filename(outputFile.getPath()).outputStream(outputStream).dccReceiver(dccReceiver);
 930                         dccReceivers.add(dccReceiver);
 931                         dccReceiver.start();
 932                         eventBus.post(new DownloadStarted(download));
 933                 } catch (FileNotFoundException fnfe1) {
 934                 }
 935         }
 936
 937         /**
 938          * Closes the output stream of the download and moves the file to the final
 939          * location.
 940          *
 941          * @param dccDownloadFinished
 942          *              The DCC download finished event
 943          */
 944         @Subscribe
 945         public void dccDownloadFinished(DccDownloadFinished dccDownloadFinished) {
 946
 947                 /* locate the correct download. */
 948                 Collection<Download> requestedDownload = FluentIterable.from(downloads.get(dccDownloadFinished.dccReceiver().filename())).filter(FILTER_RUNNING).toSet();
 949                 if (requestedDownload.isEmpty()) {
 950                         /* this seems wrong. */
 951                         logger.warn("Download finished but could not be located.");
 952                         return;
 953                 }
 954                 Download download = requestedDownload.iterator().next();
 955
 956                 try {
 957                         download.outputStream().close();
 958                         File file = new File(download.filename());
 959                         file.renameTo(new File(finalDirectory, download.pack().name()));
 960                         eventBus.post(new DownloadFinished(download));
 961                         dccReceivers.remove(dccDownloadFinished.dccReceiver());
 962                         downloads.removeAll(download.pack().name());
 963                 } catch (IOException ioe1) {
 964                         /* TODO - handle all the errors. */
 965                         logger.warn(String.format("Could not move file %s to directory %s.", download.filename(), finalDirectory), ioe1);
 966                 }
 967         }
 968
 969         /**
 970          * Closes the output stream and notifies all listeners of the failure.
 971          *
 972          * @param dccDownloadFailed
 973          *              The DCC download failed event
 974          */
 975         @Subscribe
 976         public void dccDownloadFailed(DccDownloadFailed dccDownloadFailed) {
 977
 978                 /* locate the correct download. */
 979                 Collection<Download> requestedDownload = FluentIterable.from(downloads.get(dccDownloadFailed.dccReceiver().filename())).filter(FILTER_RUNNING).toSet();
 980                 if (requestedDownload.isEmpty()) {
 981                         /* this seems wrong. */
 982                         logger.warn("Download finished but could not be located.");
 983                         return;
 984                 }
 985                 Download download = requestedDownload.iterator().next();
 986
 987                 try {
 988                         Closeables.close(download.outputStream(), true);
 989                         eventBus.post(new DownloadFailed(download));
 990                         dccReceivers.remove(dccDownloadFailed.dccReceiver());
 991                         downloads.removeAll(download.pack().name());
 992                 } catch (IOException ioe1) {
 993                         /* swallow silently. */
 994                 }
 995         }
 996
 997         @Subscribe
 998         public void replyReceived(ReplyReceived replyReceived) {
 999                 logger.trace(String.format("%s: %s", replyReceived.connection().hostname(), replyReceived.reply()));
1000         }
1001
1002         //
1003         // PRIVATE METHODS
1004         //
1005
1006         /**
1007          * Returns the download of the given pack from the given bot.
1008          *
1009          * @param pack
1010          *              The pack being downloaded
1011          * @param bot
1012          *              The bot the pack is being downloaded from
1013          * @return The download, or {@link Optional#absent()} if the download could not
1014          *         be found
1015          */
1016         private Optional<Download> getDownload(Pack pack, Bot bot) {
1017                 if (!downloads.containsKey(pack.name())) {
1018                         return Optional.absent();
1019                 }
1020                 for (Download download : Lists.newArrayList(downloads.get(pack.name()))) {
1021                         if (download.bot().equals(bot)) {
1022                                 return Optional.of(download);
1023                         }
1024                 }
1025                 return Optional.absent();
1026         }
1027
1028         /**
1029          * Searches all current connections for the given connection, returning the
1030          * associated network.
1031          *
1032          * @param connection
1033          *              The connection to get the network for
1034          * @return The network belonging to the connection, or {@link
1035          *         Optional#absent()}
1036          */
1037         private Optional<Network> getNetwork(Connection connection) {
1038                 for (Entry<Network, Connection> networkConnectionEntry : networkConnections.entrySet()) {
1039                         if (networkConnectionEntry.getValue().equals(connection)) {
1040                                 return Optional.of(networkConnectionEntry.getKey());
1041                         }
1042                 }
1043                 return Optional.absent();
1044         }
1045
1046         /**
1047          * Returns the configured channel for the given network and name.
1048          *
1049          * @param network
1050          *              The network the channel is located on
1051          * @param channelName
1052          *              The name of the channel
1053          * @return The configured channel, or {@link Optional#absent()} if no
1054          *         configured channel matching the given network and name was found
1055          */
1056         public Optional<Channel> getChannel(Network network, String channelName) {
1057                 for (Channel channel : channels) {
1058                         if (channel.network().equals(network) && (channel.name().equalsIgnoreCase(channelName))) {
1059                                 return Optional.of(channel);
1060                         }
1061                 }
1062                 return Optional.absent();
1063         }
1064
1065         /**
1066          * Returns the extra channel for the given network and name.
1067          *
1068          * @param network
1069          *              The network the channel is located on
1070          * @param channelName
1071          *              The name of the channel
1072          * @return The extra channel, or {@link Optional#absent()} if no extra channel
1073          *         matching the given network and name was found
1074          */
1075         public Optional<Channel> getExtraChannel(Network network, String channelName) {
1076                 for (Channel channel : extraChannels) {
1077                         if (channel.network().equals(network) && (channel.name().equalsIgnoreCase(channelName))) {
1078                                 return Optional.of(channel);
1079                         }
1080                 }
1081                 return Optional.absent();
1082         }
1083
1084         /**
1085          * Parses {@link Pack} information from the given message.
1086          *
1087          * @param message
1088          *              The message to parse pack information from
1089          * @return The parsed pack, or {@link Optional#absent()} if the message could
1090          *         not be parsed into a pack
1091          */
1092         private Optional<Pack> parsePack(String message) {
1093                 int squareOpen = message.indexOf('[');
1094                 int squareClose = message.indexOf(']', squareOpen);
1095                 if ((squareOpen == -1) && (squareClose == -1)) {
1096                         return Optional.absent();
1097                 }
1098                 String packSize = message.substring(squareOpen + 1, squareClose);
1099                 String packName = message.substring(message.lastIndexOf(' ') + 1);
1100                 String packIndex = message.substring(0, message.indexOf(' ')).substring(1);
1101                 return Optional.of(new Pack(packIndex, packSize, packName));
1102         }
1103
1104 }