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.inviteOnly;
  23 import static net.pterodactylus.irc.event.ChannelNotJoined.Reason.registeredNicknamesOnly;
  24 import static net.pterodactylus.irc.util.MessageCleaner.getDefaultInstance;
  25 import static net.pterodactylus.xdcc.data.Channel.TO_NETWORK;
  26 import static net.pterodactylus.xdcc.data.Download.FILTER_RUNNING;
  27
  28 import java.io.File;
  29 import java.io.FileNotFoundException;
  30 import java.io.FileOutputStream;
  31 import java.io.IOException;
  32 import java.io.OutputStream;
  33 import java.util.Collection;
  34 import java.util.Collections;
  35 import java.util.HashSet;
  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.Set;
  41 import java.util.TreeMap;
  42 import java.util.concurrent.TimeUnit;
  43 import java.util.function.Function;
  44 import java.util.stream.Collectors;
  45
  46 import net.pterodactylus.irc.Connection;
  47 import net.pterodactylus.irc.ConnectionFactory;
  48 import net.pterodactylus.irc.DccReceiver;
  49 import net.pterodactylus.irc.DefaultConnection;
  50 import net.pterodactylus.irc.event.ChannelJoined;
  51 import net.pterodactylus.irc.event.ChannelLeft;
  52 import net.pterodactylus.irc.event.ChannelMessageReceived;
  53 import net.pterodactylus.irc.event.ChannelNotJoined;
  54 import net.pterodactylus.irc.event.ClientQuit;
  55 import net.pterodactylus.irc.event.ConnectionClosed;
  56 import net.pterodactylus.irc.event.ConnectionEstablished;
  57 import net.pterodactylus.irc.event.ConnectionFailed;
  58 import net.pterodactylus.irc.event.DccAcceptReceived;
  59 import net.pterodactylus.irc.event.DccDownloadFailed;
  60 import net.pterodactylus.irc.event.DccDownloadFinished;
  61 import net.pterodactylus.irc.event.DccSendReceived;
  62 import net.pterodactylus.irc.event.KickedFromChannel;
  63 import net.pterodactylus.irc.event.NicknameChanged;
  64 import net.pterodactylus.irc.event.PrivateMessageReceived;
  65 import net.pterodactylus.irc.event.PrivateNoticeReceived;
  66 import net.pterodactylus.irc.event.ReplyReceived;
  67 import net.pterodactylus.irc.util.RandomNickname;
  68 import net.pterodactylus.xdcc.core.event.BotAdded;
  69 import net.pterodactylus.xdcc.core.event.CoreStarted;
  70 import net.pterodactylus.xdcc.core.event.DownloadFailed;
  71 import net.pterodactylus.xdcc.core.event.DownloadFinished;
  72 import net.pterodactylus.xdcc.core.event.DownloadStarted;
  73 import net.pterodactylus.xdcc.core.event.GenericError;
  74 import net.pterodactylus.xdcc.core.event.GenericMessage;
  75 import net.pterodactylus.xdcc.core.event.MessageReceived;
  76 import net.pterodactylus.xdcc.data.Bot;
  77 import net.pterodactylus.xdcc.data.Channel;
  78 import net.pterodactylus.xdcc.data.ConnectedNetwork;
  79 import net.pterodactylus.xdcc.data.Download;
  80 import net.pterodactylus.xdcc.data.Network;
  81 import net.pterodactylus.xdcc.data.Pack;
  82 import net.pterodactylus.xdcc.data.Server;
  83
  84 import com.google.common.base.Optional;
  85 import com.google.common.base.Predicate;
  86 import com.google.common.collect.FluentIterable;
  87 import com.google.common.collect.HashBasedTable;
  88 import com.google.common.collect.HashMultimap;
  89 import com.google.common.collect.ImmutableList;
  90 import com.google.common.collect.ImmutableSet;
  91 import com.google.common.collect.Lists;
  92 import com.google.common.collect.Maps;
  93 import com.google.common.collect.Multimap;
  94 import com.google.common.collect.Sets;
  95 import com.google.common.collect.Table;
  96 import com.google.common.eventbus.EventBus;
  97 import com.google.common.eventbus.Subscribe;
  98 import com.google.common.io.Closeables;
  99 import com.google.common.util.concurrent.AbstractExecutionThreadService;
 100 import com.google.inject.Inject;
 101 import org.apache.log4j.Logger;
 102
 103 /**
 104  * The core of XDCC Downloader.
 105  *
 106  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
 107  */
 108 public class Core extends AbstractExecutionThreadService {
 109
 110         /** The logger. */
 111         private static final Logger logger = Logger.getLogger(Core.class.getName());
 112
 113         private final Object syncObject = new Object();
 114         /** The event bus. */
 115         private final EventBus eventBus;
 116         private final ConnectionFactory connectionFactory;
 117         private final ChannelBanManager channelBanManager =
 118                         new ChannelBanManager();
 119         private final ConnectionBackoff connectionBackoff = new ConnectionBackoff();
 120
 121         /** The temporary directory to download files to. */
 122         private final String temporaryDirectory;
 123
 124         /** The directory to move finished downloads to. */
 125         private final String finalDirectory;
 126
 127         /** The channels that should be monitored. */
 128         private final Collection<Channel> channels = Sets.newHashSet();
 129
 130         /** The channels that are currentlymonitored. */
 131         private final Collection<Channel> joinedChannels = Sets.newHashSet();
 132         private final Set<Channel> channelsBeingJoined = new HashSet<>();
 133
 134         /** The channels that are joined but not configured. */
 135         private final Collection<Channel> extraChannels = Sets.newHashSet();
 136
 137         /** The current network connections. */
 138         private final Map<Network, Connection> networkConnections = Collections.synchronizedMap(Maps.<Network, Connection>newHashMap());
 139
 140         /** The currently known bots. */
 141         private final Table<Network, String, Bot> networkBots = HashBasedTable.create();
 142
 143         /** The current downloads. */
 144         private final Multimap<String, Download> downloads = HashMultimap.create();
 145
 146         /** The current DCC receivers. */
 147         private final Collection<DccReceiver> dccReceivers = Lists.newArrayList();
 148
 149         /**
 150          * Creates a new core.
 151          *
 152          * @param eventBus
 153          *              The event bus
 154          * @param temporaryDirectory
 155          *              The directory to download files to
 156          * @param finalDirectory
 157          *              The directory to move finished files to
 158          */
 159         @Inject
 160         public Core(EventBus eventBus, ConnectionFactory connectionFactory, String temporaryDirectory, String finalDirectory) {
 161                 this.eventBus = eventBus;
 162                 this.connectionFactory = connectionFactory;
 163                 this.temporaryDirectory = temporaryDirectory;
 164                 this.finalDirectory = finalDirectory;
 165         }
 166
 167         //
 168         // ACCESSORS
 169         //
 170
 171         /**
 172          * Returns all currently known connections.
 173          *
 174          * @return All currently known connections
 175          */
 176         public Collection<Connection> connections() {
 177                 return networkConnections.values();
 178         }
 179
 180         /**
 181          * Returns all defined networks.
 182          *
 183          * @return All defined networks
 184          */
 185         public Collection<Network> networks() {
 186                 return FluentIterable.from(channels).transform(TO_NETWORK).toSet();
 187         }
 188
 189         /**
 190          * Returns all connected networks.
 191          *
 192          * @return All connected networks
 193          */
 194         public Collection<ConnectedNetwork> connectedNetworks() {
 195                 return networkConnections.entrySet().stream().map((entry) -> {
 196                         Network network = entry.getKey();
 197                         Collection<Bot> bots = networkBots.row(network).values();
 198                         int packCount = bots.stream().mapToInt((bot) -> bot.packs().size()).reduce((a, b) -> a + b).orElse(0);
 199                         return new ConnectedNetwork(network, entry.getValue().hostname(),
 200                                         entry.getValue().port(), entry.getValue().nickname(),
 201                                         channels.stream()
 202                                                         .filter((channel) -> channel.network()
 203                                                                         .equals(network))
 204                                                         .map(Channel::name)
 205                                                         .collect(Collectors.<String>toList()),
 206                                         extraChannels.stream()
 207                                                         .filter((channel) -> channel.network()
 208                                                                         .equals(network))
 209                                                         .map(Channel::name)
 210                                                         .collect(Collectors.<String>toList()),
 211                                         bots.size(), packCount);
 212                 }).collect(Collectors.<ConnectedNetwork>toList());
 213         }
 214
 215         /**
 216          * Returns all configured channels. Due to various circumstances, configured
 217          * channels might not actually be joined.
 218          *
 219          * @return All configured channels
 220          */
 221         public Collection<Channel> channels() {
 222                 return ImmutableSet.copyOf(channels);
 223         }
 224
 225         /**
 226          * Returns all currently joined channels.
 227          *
 228          * @return All currently joined channels
 229          */
 230         public Collection<Channel> joinedChannels() {
 231                 return ImmutableSet.copyOf(joinedChannels);
 232         }
 233
 234         /**
 235          * Returns all currently joined channels that are not configured.
 236          *
 237          * @return All currently joined but not configured channels
 238          */
 239         public Collection<Channel> extraChannels() {
 240                 return ImmutableSet.copyOf(extraChannels);
 241         }
 242
 243         /**
 244          * Returns all currently known bots.
 245          *
 246          * @return All currently known bots
 247          */
 248         public Collection<Bot> bots() {
 249                 return networkBots.values();
 250         }
 251
 252         /**
 253          * Returns all currently running downloads.
 254          *
 255          * @return All currently running downloads
 256          */
 257         public Collection<Download> downloads() {
 258                 return downloads.values();
 259         }
 260
 261         //
 262         // ACTIONS
 263         //
 264
 265         /**
 266          * Adds a channel to monitor.
 267          *
 268          * @param channel
 269          *              The channel to monitor
 270          */
 271         public void addChannel(Channel channel) {
 272                 channels.add(channel);
 273         }
 274
 275         /**
 276          * Fetches the given pack from the given bot.
 277          *
 278          * @param bot
 279          *              The bot to fetch the pack from
 280          * @param pack
 281          *              The pack to fetch
 282          */
 283         public void fetch(Bot bot, Pack pack) {
 284                 Connection connection = networkConnections.get(bot.network());
 285                 if (connection == null) {
 286                         return;
 287                 }
 288
 289                 /* check if we are already downloading the file? */
 290                 if (downloads.containsKey(pack.name())) {
 291                         Collection<Download> packDownloads = downloads.get(pack.name());
 292                         Collection<Download> runningDownloads = FluentIterable.from(packDownloads).filter(FILTER_RUNNING).toSet();
 293                         if (!runningDownloads.isEmpty()) {
 294                                 Download download = runningDownloads.iterator().next();
 295                                 eventBus.post(new GenericMessage(String.format("File %s is already downloading from %s (%s).", pack.name(), download.bot().name(), download.bot().network().name())));
 296                                 return;
 297                         }
 298                         StringBuilder bots = new StringBuilder();
 299                         for (Download download : packDownloads) {
 300                                 if (bots.length() > 0) {
 301                                         bots.append(", ");
 302                                 }
 303                                 bots.append(download.bot().name()).append(" (").append(download.bot().network().name()).append(')');
 304                         }
 305                         eventBus.post(new GenericMessage(String.format("File %s is already requested from %d bots (%s).", pack.name(), packDownloads.size(), bots.toString())));
 306                 }
 307
 308                 Download download = new Download(bot, pack);
 309                 downloads.put(pack.name(), download);
 310
 311                 try {
 312                         connection.sendMessage(bot.name(), "XDCC SEND " + pack.id());
 313                 } catch (IOException ioe1) {
 314                         logger.warn("Could not send message to bot!", ioe1);
 315                 }
 316         }
 317
 318         /**
 319          * Cancels the download of the given pack from the given bot.
 320          *
 321          * @param bot
 322          *              The bot the pack is being downloaded from
 323          * @param pack
 324          *              The pack being downloaded
 325          */
 326         public void cancelDownload(Bot bot, Pack pack) {
 327                 Optional<Download> download = getDownload(pack, bot);
 328                 if (!download.isPresent()) {
 329                         return;
 330                 }
 331
 332                 /* get connection. */
 333                 Connection connection = networkConnections.get(bot.network());
 334                 if (connection == null) {
 335                         /* request for unknown network? */
 336                         return;
 337                 }
 338
 339                 /* stop the DCC receiver. */
 340                 if (download.get().dccReceiver() != null) {
 341                         download.get().dccReceiver().stop();
 342                 } else {
 343                         /* remove download if it hasn’t started yet. */
 344                         downloads.remove(pack.name(), download.get());
 345                 }
 346
 347                 /* remove the request from the bot, too. */
 348                 try {
 349                         connection.sendMessage(bot.name(), String.format("XDCC %s", (download.get().dccReceiver() != null) ? "CANCEL" : "REMOVE"));
 350                 } catch (IOException ioe1) {
 351                         logger.warn(String.format("Could not cancel DCC from %s (%s)!", bot.name(), bot.network().name()), ioe1);
 352                 }
 353         }
 354
 355         /**
 356          * Closes the given connection.
 357          *
 358          * @param connection
 359          *              The connection to close
 360          */
 361         public void closeConnection(Connection connection) {
 362                 try {
 363                         connection.close();
 364                 } catch (IOException ioe1) {
 365                         /* TODO */
 366                 }
 367         }
 368
 369         //
 370         // ABSTRACTIDLESERVICE METHODS
 371         //
 372
 373         @Override
 374         protected void startUp() {
 375                 for (Channel channel : channels) {
 376                         logger.info(String.format("Connecting to Channel %s on Network %s…", channel.name(), channel.network().name()));
 377                         connectNetwork(channel.network());
 378                 }
 379
 380                 /* notify listeners. */
 381                 eventBus.post(new CoreStarted(this));
 382         }
 383
 384         @Override
 385         protected void run() throws Exception {
 386                 while (isRunning()) {
 387
 388                         Set<Channel> missingChannels = new HashSet<>();
 389                         for (Channel channel : channels) {
 390                                 if (joinedChannels.contains(channel) || channelsBeingJoined.contains(channel)) {
 391                                         continue;
 392                                 }
 393                                 if (channelBanManager.isBanned(channel)) {
 394                                         continue;
 395                                 }
 396                                 if (!networkConnections.containsKey(channel.network()) || networkConnections.get(channel.network()).established()) {
 397                                         missingChannels.add(channel);
 398                                 }
 399                         }
 400                         Set<Network> missingNetworks = missingChannels.stream()
 401                                         .map(Channel::network)
 402                                         .distinct()
 403                                         .filter((network) -> !networkConnections.containsKey(network))
 404                                         .collect(Collectors.toSet());
 405
 406                         if (missingNetworks.isEmpty()) {
 407                                 if (!missingChannels.isEmpty()) {
 408                                         for (Channel missingChannel : missingChannels) {
 409                                                 Network network = missingChannel.network();
 410                                                 eventBus.post(new GenericMessage(String.format("Trying to join %s on %s...", missingChannel.name(), network)));
 411                                                 try {
 412                                                         channelsBeingJoined.add(missingChannel);
 413                                                         networkConnections.get(network).joinChannel(missingChannel.name());
 414                                                 } catch (IOException ioe1) {
 415                                                         logger.warn(String.format("Could not join %s on %s!", missingChannel.name(), network.name()), ioe1);
 416                                                 }
 417                                         }
 418                                 } else {
 419                                         synchronized (syncObject) {
 420                                                 try {
 421                                                         syncObject.wait(TimeUnit.MINUTES.toMillis(1));
 422                                                 } catch (InterruptedException ie1) {
 423                                                 /* ignore. */
 424                                                 }
 425                                         }
 426                                 }
 427                                 continue;
 428                         }
 429
 430                         Map<Long, Network> timesForNextConnects = new TreeMap<>(missingNetworks.stream()
 431                                         .collect(Collectors.toMap(connectionBackoff::getBackoff, Function.identity(), (network, ignore) -> network)));
 432
 433                         Optional<Entry<Long, Network>> firstNetwork = Optional.fromNullable(timesForNextConnects.entrySet().stream().findFirst().orElse(null));
 434                         if (!firstNetwork.isPresent()) {
 435                                 continue;
 436                         }
 437                         if (firstNetwork.get().getKey() > 0) {
 438                                 eventBus.post(new GenericMessage(String.format("Waiting %d minutes to connect to %s...", TimeUnit.MILLISECONDS.toMinutes(firstNetwork.get().getKey()), firstNetwork.get().getValue().name())));
 439                                 synchronized (syncObject) {
 440                                         try {
 441                                                 syncObject.wait(firstNetwork.get().getKey());
 442                                         } catch (InterruptedException ie1) {
 443                                                 /* ignore. */
 444                                         }
 445                                 }
 446                                 if (!isRunning()) {
 447                                         break;
 448                                 }
 449                         }
 450
 451                         connectNetwork(firstNetwork.get().getValue());
 452                 }
 453         }
 454
 455         @Override
 456         protected void triggerShutdown() {
 457                 synchronized (syncObject) {
 458                         syncObject.notifyAll();
 459                 }
 460         }
 461
 462         //
 463         // PRIVATE METHODS
 464         //
 465
 466         /**
 467          * Starts a new connection for the given network if no such connection exists
 468          * already.
 469          *
 470          * @param network
 471          *              The network to connect to
 472          */
 473         private void connectNetwork(Network network) {
 474                 if (!networkConnections.containsKey(network)) {
 475                                 /* select a random server. */
 476                         List<Server> servers = Lists.newArrayList(network.servers());
 477                         if (servers.isEmpty()) {
 478                                 eventBus.post(new GenericError(String.format("Network %s does not have any servers.", network.name())));
 479                                 return;
 480                         }
 481                         Server server = servers.get((int) (Math.random() * servers.size()));
 482                         eventBus.post(new GenericMessage(String.format("Connecting to %s on %s...", network.name(), server.hostname())));
 483                         Connection connection = connectionFactory.createConnection(server.hostname(),
 484                                         server.unencryptedPorts().iterator().next());
 485                         connection.username(RandomNickname.get()).realName(RandomNickname.get());
 486                         networkConnections.put(network, connection);
 487                         connection.open();
 488                 }
 489         }
 490
 491         /**
 492          * Removes the given connection and all its channels and bots.
 493          *
 494          * @param connection
 495          *              The connection to remove
 496          */
 497         private void removeConnection(Connection connection) {
 498                 Optional<Network> network = getNetwork(connection);
 499                 if (!network.isPresent()) {
 500                         return;
 501                 }
 502                 networkConnections.remove(network.get());
 503                 if (!connection.established()) {
 504                         return;
 505                 }
 506
 507                 /* find all channels that need to be removed. */
 508                 for (Collection<Channel> channels : ImmutableList.of(joinedChannels, extraChannels)) {
 509                         for (Iterator<Channel> channelIterator = channels.iterator(); channelIterator.hasNext(); ) {
 510                                 Channel joinedChannel = channelIterator.next();
 511                                 if (!joinedChannel.network().equals(network.get())) {
 512                                         continue;
 513                                 }
 514
 515                                 channelIterator.remove();
 516                         }
 517                 }
 518
 519                 /* now remove all bots for that network. */
 520                 Map<String, Bot> bots = networkBots.row(network.get());
 521                 int botCount = bots.size();
 522                 int packCount = 0;
 523                 for (Bot bot : bots.values()) {
 524                         packCount += bot.packs().size();
 525                 }
 526                 bots.clear();
 527                 eventBus.post(new GenericMessage(String.format("Network %s disconnected, %d bots removed, %d packs removed.", network.get().name(), botCount, packCount)));
 528         }
 529
 530         //
 531         // EVENT HANDLERS
 532         //
 533
 534         /**
 535          * If a connection to a network has been established, the channels associated
 536          * with this network are joined.
 537          *
 538          * @param connectionEstablished
 539          *              The connection established event
 540          */
 541         @Subscribe
 542         public void connectionEstablished(ConnectionEstablished connectionEstablished) {
 543
 544                 /* get network for connection. */
 545                 Optional<Network> network = getNetwork(connectionEstablished.connection());
 546
 547                 /* found network? */
 548                 if (!network.isPresent()) {
 549                         eventBus.post(new GenericMessage(String.format("Connected to unknown network: %s", connectionEstablished.connection().hostname())));
 550                         return;
 551                 }
 552
 553                 connectionBackoff.connectionSuccessful(network.get());
 554                 eventBus.post(new GenericMessage(String.format("Connected to network %s.", network.get().name())));
 555
 556                 /* join all channels on this network. */
 557                 for (Channel channel : channels) {
 558                         if (channel.network().equals(network.get())) {
 559                                 try {
 560                                         eventBus.post(new GenericMessage(String.format("Trying to join %s on %s...", channel.name(), network.get().name())));
 561                                         connectionEstablished.connection().joinChannel(channel.name());
 562                                 } catch (IOException ioe1) {
 563                                         logger.warn(String.format("Could not join %s on %s!", channel.name(), network.get().name()), ioe1);
 564                                 }
 565                         }
 566                 }
 567         }
 568
 569         /**
 570          * Remove all data stored for a network if the connection is closed.
 571          *
 572          * @param connectionClosed
 573          *              The connection closed event
 574          */
 575         @Subscribe
 576         public void connectionClosed(ConnectionClosed connectionClosed) {
 577                 connectionBackoff.connectionFailed(getNetwork(connectionClosed.connection()).get());
 578                 removeConnection(connectionClosed.connection());
 579                 synchronized (syncObject) {
 580                         syncObject.notifyAll();
 581                 }
 582                 eventBus.post(new GenericMessage(String.format("Connection closed by %s.", connectionClosed.connection().hostname())));
 583         }
 584
 585         /**
 586          * Remove all data stored for a network if the connection fails.
 587          *
 588          * @param connectionFailed
 589          *              The connection failed event
 590          */
 591         @Subscribe
 592         public void connectionFailed(ConnectionFailed connectionFailed) {
 593                 connectionBackoff.connectionFailed(getNetwork(connectionFailed.connection()).get());
 594                 removeConnection(connectionFailed.connection());
 595                 synchronized (syncObject) {
 596                         syncObject.notifyAll();
 597                 }
 598                 eventBus.post(new GenericMessage(String.format("Could not connect to %s: %s.", connectionFailed.connection().hostname(), connectionFailed.cause())));
 599         }
 600
 601         /**
 602          * Shows a message when a channel was joined by us.
 603          *
 604          * @param channelJoined
 605          *              The channel joined event
 606          */
 607         @Subscribe
 608         public void channelJoined(ChannelJoined channelJoined) {
 609                 if (channelJoined.connection().isSource(channelJoined.client())) {
 610                         Optional<Network> network = getNetwork(channelJoined.connection());
 611                         if (!network.isPresent()) {
 612                                 return;
 613                         }
 614
 615                         Optional<Channel> channel = getChannel(network.get(), channelJoined.channel());
 616                         if (!channel.isPresent()) {
 617                                 /* it’s an extra channel. */
 618                                 extraChannels.add(new Channel(network.get(), channelJoined.channel()));
 619                                 logger.info(String.format("Joined extra Channel %s on %s.", channelJoined.channel(), network.get().name()));
 620                                 return;
 621                         }
 622
 623                         channelBanManager.unban(channel.get());
 624                         joinedChannels.add(channel.get());
 625                         channelsBeingJoined.remove(channel.get());
 626                         logger.info(String.format("Joined Channel %s on %s.", channelJoined.channel(), network.get().name()));
 627                 }
 628         }
 629
 630         @Subscribe
 631         public void channelNotJoined(ChannelNotJoined channelNotJoined) {
 632                 Optional<Network> network = getNetwork(channelNotJoined.connection());
 633                 if (!network.isPresent()) {
 634                         return;
 635                 }
 636
 637                 Optional<Channel> channel = getChannel(network.get(), channelNotJoined.channel());
 638                 synchronized (syncObject) {
 639                         syncObject.notifyAll();
 640                 }
 641                 if (!channel.isPresent()) {
 642                         eventBus.post(new GenericMessage(format("Could not join %s but didn’t try to join, either.", channelNotJoined.channel())));
 643                         return;
 644                 }
 645                 channelsBeingJoined.remove(channel.get());
 646
 647
 648                 /* remove all bots for this channel, we might have been kicked. */
 649                 Collection<Bot> botsToRemove = networkBots.row(network.get())
 650                                 .values().stream()
 651                                 .filter(bot -> bot.channel()
 652                                                 .equalsIgnoreCase(channel.get().name()))
 653                                 .collect(Collectors.toSet());
 654                 botsToRemove.stream()
 655                                 .forEach(bot -> networkBots.row(network.get())
 656                                                 .remove(bot.name()));
 657
 658                 if (channelNotJoined.reason() == registeredNicknamesOnly) {
 659                         channels.remove(channel.get());
 660                         eventBus.post(new GenericMessage(
 661                                         format("Not trying to join %s anymore.", channel.get())));
 662                         return;
 663                 }
 664                 if (channelNotJoined.reason() == inviteOnly) {
 665                         channelBanManager.ban(channel.get());
 666                         eventBus.post(new GenericMessage(
 667                                         format("%s is invite-only, suspending join for a day.",
 668                                                         channel.get())));
 669                         return;
 670                 }
 671                 if (channelNotJoined.reason() == banned) {
 672                         channelBanManager.ban(channel.get());
 673                         eventBus.post(new GenericMessage(
 674                                         format("Banned from %s, suspending join for a day.",
 675                                                         channel.get())));
 676                         return;
 677                 }
 678
 679                 eventBus.post(new GenericMessage(
 680                                 format("Could not join %s: %s", channelNotJoined.channel(),
 681                                                 channelNotJoined.reason())));
 682         }
 683
 684         /**
 685          * Removes bots that leave a channel, or channels when it’s us that’s leaving.
 686          *
 687          * @param channelLeft
 688          *              The channel left event
 689          */
 690         @Subscribe
 691         public void channelLeft(ChannelLeft channelLeft) {
 692                 Optional<Network> network = getNetwork(channelLeft.connection());
 693                 if (!network.isPresent()) {
 694                         return;
 695                 }
 696
 697                 Bot bot = networkBots.get(network.get(), channelLeft.client().nick().get());
 698                 if (bot == null) {
 699                         /* maybe it was us? */
 700                         if (channelLeft.connection().isSource(channelLeft.client())) {
 701                                 Optional<Channel> channel = getChannel(network.get(), channelLeft.channel());
 702                                 if (!channel.isPresent()) {
 703                                         /* maybe it was an extra channel? */
 704                                         channel = getExtraChannel(network.get(), channelLeft.channel());
 705                                         if (!channel.isPresent()) {
 706                                                 /* okay, whatever. */
 707                                                 return;
 708                                         }
 709
 710                                         extraChannels.remove(channel);
 711                                 } else {
 712                                         channels.remove(channel.get());
 713                                 }
 714                                 synchronized (syncObject) {
 715                                         syncObject.notifyAll();
 716                                 }
 717
 718                                 eventBus.post(new GenericMessage(String.format("Left Channel %s on %s.", channel.get().name(), channel.get().network().name())));
 719                         }
 720
 721                         return;
 722                 }
 723
 724                 networkBots.remove(network.get(), channelLeft.client().nick().get());
 725         }
 726
 727         @Subscribe
 728         public void kickedFromChannel(KickedFromChannel kickedFromChannel) {
 729                 Optional<Network> network = getNetwork(kickedFromChannel.connection());
 730                 if (!network.isPresent()) {
 731                         return;
 732                 }
 733
 734                 /* have we been kicked? */
 735                 if (nicknameMatchesConnection(kickedFromChannel.connection(), kickedFromChannel.kickee())) {
 736                         Optional<Channel> channel = getChannel(network.get(), kickedFromChannel.channel());
 737                         if (!channel.isPresent()) {
 738                                 /* maybe it was an extra channel? */
 739                                 channel = getExtraChannel(network.get(), kickedFromChannel.channel());
 740                                 if (!channel.isPresent()) {
 741                                         /* okay, whatever. */
 742                                         return;
 743                                 }
 744
 745                                 extraChannels.remove(channel.get());
 746                         } else {
 747                                 joinedChannels.remove(channel.get());
 748                         }
 749                         synchronized (syncObject) {
 750                                 syncObject.notifyAll();
 751                         }
 752                         eventBus.post(new GenericMessage(format(
 753                                         "Kicked from %s by %s: %s",
 754                                         kickedFromChannel.channel(),
 755                                         kickedFromChannel.kicker(),
 756                                         kickedFromChannel.reason().or("<unknown>")
 757                         )));
 758                 }
 759         }
 760
 761         private boolean nicknameMatchesConnection(Connection connection, String nickname) {
 762                 return connection.nickname().equalsIgnoreCase(nickname);
 763         }
 764
 765         /**
 766          * Removes a client (which may be a bot) from the table of known bots.
 767          *
 768          * @param clientQuit
 769          *              The client quit event
 770          */
 771         @Subscribe
 772         public void clientQuit(ClientQuit clientQuit) {
 773                 Optional<Network> network = getNetwork(clientQuit.connection());
 774                 if (!network.isPresent()) {
 775                         return;
 776                 }
 777
 778                 networkBots.remove(network.get(), clientQuit.client().nick().get());
 779         }
 780
 781         /**
 782          * If the nickname of a bit changes, remove it from the old name and store it
 783          * under the new name.
 784          *
 785          * @param nicknameChanged
 786          *              The nickname changed event
 787          */
 788         @Subscribe
 789         public void nicknameChanged(NicknameChanged nicknameChanged) {
 790                 Optional<Network> network = getNetwork(nicknameChanged.connection());
 791                 if (!network.isPresent()) {
 792                         return;
 793                 }
 794
 795                 Bot bot = networkBots.remove(network.get(), nicknameChanged.client().nick().get());
 796                 if (bot == null) {
 797                         return;
 798                 }
 799
 800                 networkBots.put(network.get(), nicknameChanged.newNickname(), bot);
 801         }
 802
 803         /**
 804          * If a message on a channel is received, it is parsed for pack information
 805          * with is then added to a bot.
 806          *
 807          * @param channelMessageReceived
 808          *              The channel message received event
 809          */
 810         @Subscribe
 811         public void channelMessageReceived(ChannelMessageReceived channelMessageReceived) {
 812                 String message = getDefaultInstance().clean(channelMessageReceived.message());
 813                 if (!message.startsWith("#")) {
 814                         /* most probably not a pack announcement. */
 815                         return;
 816                 }
 817
 818                 Optional<Network> network = getNetwork(channelMessageReceived.connection());
 819                 if (!network.isPresent()) {
 820                         /* message for unknown connection? */
 821                         return;
 822                 }
 823
 824                 /* parse pack information. */
 825                 Optional<Pack> pack = parsePack(message);
 826                 if (!pack.isPresent()) {
 827                         return;
 828                 }
 829
 830                 Bot bot;
 831                 synchronized (networkBots) {
 832                         if (!networkBots.contains(network.get(), channelMessageReceived.source().nick().get())) {
 833                                 bot = new Bot(network.get(), channelMessageReceived.channel(),
 834                                                 channelMessageReceived.source().nick().get());
 835                                 networkBots.put(network.get(), channelMessageReceived.source().nick().get(), bot);
 836                                 eventBus.post(new BotAdded(bot));
 837                         } else {
 838                                 bot = networkBots.get(network.get(), channelMessageReceived.source().nick().get());
 839                         }
 840                 }
 841
 842                 /* add pack. */
 843                 bot.addPack(pack.get());
 844                 logger.debug(String.format("Bot %s now has %d packs.", bot, bot.packs().size()));
 845         }
 846
 847         /**
 848          * Forward all private messages to every console.
 849          *
 850          * @param privateMessageReceived
 851          *              The private message recevied event
 852          */
 853         @Subscribe
 854         public void privateMessageReceived(PrivateMessageReceived privateMessageReceived) {
 855                 eventBus.post(new MessageReceived(privateMessageReceived.source(), privateMessageReceived.message()));
 856         }
 857
 858         /**
 859          * Sends a message to all console when a notice was received.
 860          *
 861          * @param privateNoticeReceived
 862          *              The notice received event
 863          */
 864         @Subscribe
 865         public void privateNoticeReceived(PrivateNoticeReceived privateNoticeReceived) {
 866                 Optional<Network> network = getNetwork(privateNoticeReceived.connection());
 867                 if (!network.isPresent()) {
 868                         return;
 869                 }
 870
 871                 eventBus.post(new GenericMessage(String.format("Notice from %s (%s): %s", privateNoticeReceived.source(), network.get(), privateNoticeReceived.text())));
 872         }
 873
 874         /**
 875          * Starts a DCC download.
 876          *
 877          * @param dccSendReceived
 878          *              The DCC SEND event
 879          */
 880         @Subscribe
 881         public void dccSendReceived(final DccSendReceived dccSendReceived) {
 882                 final Optional<Network> network = getNetwork(dccSendReceived.connection());
 883                 if (!network.isPresent()) {
 884                         return;
 885                 }
 886
 887                 Collection<Download> packDownloads = downloads.get(dccSendReceived.filename());
 888                 if (packDownloads.isEmpty()) {
 889                         /* unknown download, ignore. */
 890                         return;
 891                 }
 892
 893                 /* check if it’s already downloading. */
 894                 Collection<Download> runningDownloads = FluentIterable.from(packDownloads).filter(FILTER_RUNNING).toSet();
 895                 if (!runningDownloads.isEmpty()) {
 896                         eventBus.post(new GenericMessage(String.format("Ignoring offer for %s, it’s already being downloaded.", dccSendReceived.filename())));
 897                         return;
 898                 }
 899
 900                 /* locate the correct download. */
 901                 Collection<Download> requestedDownload = FluentIterable.from(packDownloads).filter(new Predicate<Download>() {
 902
 903                         @Override
 904                         public boolean apply(Download download) {
 905                                 return download.bot().network().equals(network.get()) && download.bot().name().equalsIgnoreCase(dccSendReceived.source().nick().get());
 906                         }
 907                 }).toSet();
 908
 909                 /* we did not request this download. */
 910                 if (requestedDownload.isEmpty()) {
 911                         return;
 912                 }
 913
 914                 Download download = requestedDownload.iterator().next();
 915
 916                 /* check if the file already exists. */
 917                 File outputFile = new File(temporaryDirectory, dccSendReceived.filename());
 918                 if (outputFile.exists()) {
 919                         long existingFileSize = outputFile.length();
 920
 921                         /* file already complete? */
 922                         if ((dccSendReceived.filesize() > -1) && (existingFileSize >= dccSendReceived.filesize())) {
 923                                 /* file is apparently already complete. just move it. */
 924                                 if (outputFile.renameTo(new File(finalDirectory, download.pack().name()))) {
 925                                         eventBus.post(new GenericMessage(String.format("File %s already downloaded.", download.pack().name())));
 926                                 } else {
 927                                         eventBus.post(new GenericMessage(String.format("File %s already downloaded but not moved to %s.", download.pack().name(), finalDirectory)));
 928                                 }
 929
 930                                 /* remove download. */
 931                                 downloads.removeAll(download.pack().name());
 932                                 return;
 933                         }
 934
 935                         /* file not complete yet, DCC resume it. */
 936                         try {
 937                                 download.remoteAddress(dccSendReceived.inetAddress()).filesize(dccSendReceived.filesize());
 938                                 dccSendReceived.connection().sendDccResume(dccSendReceived.source().nick().get(), dccSendReceived.filename(), dccSendReceived.port(), existingFileSize);
 939                         } catch (IOException ioe1) {
 940                                 eventBus.post(new GenericError(String.format("Could not send DCC RESUME %s to %s (%s).", dccSendReceived.filename(), dccSendReceived.source().nick().get(), ioe1.getMessage())));
 941                         }
 942
 943                         return;
 944                 }
 945
 946                 /* file does not exist, start the download. */
 947                 try {
 948                         OutputStream fileOutputStream = new FileOutputStream(outputFile);
 949                         DccReceiver dccReceiver = new DccReceiver(eventBus, dccSendReceived.inetAddress(), dccSendReceived.port(), dccSendReceived.filename(), dccSendReceived.filesize(), fileOutputStream);
 950                         download.filename(outputFile.getPath()).outputStream(fileOutputStream).dccReceiver(dccReceiver);
 951                         dccReceivers.add(dccReceiver);
 952                         dccReceiver.start();
 953                         eventBus.post(new DownloadStarted(download));
 954                 } catch (FileNotFoundException fnfe1) {
 955                         eventBus.post(new GenericError(String.format("Could not start download of %s from %s (%s).", dccSendReceived.filename(), dccSendReceived.source().nick().get(), fnfe1.getMessage())));
 956                 }
 957         }
 958
 959         @Subscribe
 960         public void dccAcceptReceived(final DccAcceptReceived dccAcceptReceived) {
 961                 final Optional<Network> network = getNetwork(dccAcceptReceived.connection());
 962                 if (!network.isPresent()) {
 963                         return;
 964                 }
 965
 966                 Collection<Download> packDownloads = downloads.get(dccAcceptReceived.filename());
 967                 if (packDownloads.isEmpty()) {
 968                         /* unknown download, ignore. */
 969                         return;
 970                 }
 971
 972                 /* check if it’s already downloading. */
 973                 Collection<Download> runningDownloads = FluentIterable.from(packDownloads).filter(FILTER_RUNNING).toSet();
 974                 if (!runningDownloads.isEmpty()) {
 975                         eventBus.post(new GenericMessage(String.format("Ignoring offer for %s, it’s already being downloaded.", dccAcceptReceived.filename())));
 976                         return;
 977                 }
 978
 979                 /* locate the correct download. */
 980                 Collection<Download> requestedDownload = FluentIterable.from(packDownloads).filter(new Predicate<Download>() {
 981
 982                         @Override
 983                         public boolean apply(Download download) {
 984                                 return download.bot().network().equals(network.get()) && download.bot().name().equalsIgnoreCase(dccAcceptReceived.source().nick().get());
 985                         }
 986                 }).toSet();
 987
 988                 /* we did not request this download. */
 989                 if (requestedDownload.isEmpty()) {
 990                         return;
 991                 }
 992
 993                 Download download = requestedDownload.iterator().next();
 994
 995                 try {
 996                         File outputFile = new File(temporaryDirectory, dccAcceptReceived.filename());
 997                         if (outputFile.length() != dccAcceptReceived.position()) {
 998                                 eventBus.post(new GenericError(String.format("Download %s from %s does not start at the right position!")));
 999                                 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()));
1000
1001                                 downloads.removeAll(download.pack().name());
1002                                 return;
1003                         }
1004                         OutputStream outputStream = new FileOutputStream(outputFile, true);
1005                         DccReceiver dccReceiver = new DccReceiver(eventBus, download.remoteAddress(), dccAcceptReceived.port(), dccAcceptReceived.filename(), dccAcceptReceived.position(), download.filesize(), outputStream);
1006                         download.filename(outputFile.getPath()).outputStream(outputStream).dccReceiver(dccReceiver);
1007                         dccReceivers.add(dccReceiver);
1008                         dccReceiver.start();
1009                         eventBus.post(new DownloadStarted(download));
1010                 } catch (FileNotFoundException fnfe1) {
1011                 }
1012         }
1013
1014         /**
1015          * Closes the output stream of the download and moves the file to the final
1016          * location.
1017          *
1018          * @param dccDownloadFinished
1019          *              The DCC download finished event
1020          */
1021         @Subscribe
1022         public void dccDownloadFinished(DccDownloadFinished dccDownloadFinished) {
1023
1024                 /* locate the correct download. */
1025                 Collection<Download> requestedDownload = FluentIterable.from(downloads.get(dccDownloadFinished.dccReceiver().filename())).filter(FILTER_RUNNING).toSet();
1026                 if (requestedDownload.isEmpty()) {
1027                         /* this seems wrong. */
1028                         logger.warn("Download finished but could not be located.");
1029                         return;
1030                 }
1031                 Download download = requestedDownload.iterator().next();
1032
1033                 try {
1034                         download.outputStream().close();
1035                         File file = new File(download.filename());
1036                         file.renameTo(new File(finalDirectory, download.pack().name()));
1037                         eventBus.post(new DownloadFinished(download));
1038                         dccReceivers.remove(dccDownloadFinished.dccReceiver());
1039                         downloads.removeAll(download.pack().name());
1040                 } catch (IOException ioe1) {
1041                         /* TODO - handle all the errors. */
1042                         logger.warn(String.format("Could not move file %s to directory %s.", download.filename(), finalDirectory), ioe1);
1043                 }
1044         }
1045
1046         /**
1047          * Closes the output stream and notifies all listeners of the failure.
1048          *
1049          * @param dccDownloadFailed
1050          *              The DCC download failed event
1051          */
1052         @Subscribe
1053         public void dccDownloadFailed(DccDownloadFailed dccDownloadFailed) {
1054
1055                 /* locate the correct download. */
1056                 Collection<Download> requestedDownload = FluentIterable.from(downloads.get(dccDownloadFailed.dccReceiver().filename())).filter(FILTER_RUNNING).toSet();
1057                 if (requestedDownload.isEmpty()) {
1058                         /* this seems wrong. */
1059                         logger.warn("Download finished but could not be located.");
1060                         return;
1061                 }
1062                 Download download = requestedDownload.iterator().next();
1063
1064                 try {
1065                         Closeables.close(download.outputStream(), true);
1066                         eventBus.post(new DownloadFailed(download));
1067                         dccReceivers.remove(dccDownloadFailed.dccReceiver());
1068                         downloads.removeAll(download.pack().name());
1069                 } catch (IOException ioe1) {
1070                         /* swallow silently. */
1071                 }
1072         }
1073
1074         @Subscribe
1075         public void replyReceived(ReplyReceived replyReceived) {
1076                 logger.trace(String.format("%s: %s", replyReceived.connection().hostname(), replyReceived.reply()));
1077         }
1078
1079         //
1080         // PRIVATE METHODS
1081         //
1082
1083         /**
1084          * Returns the download of the given pack from the given bot.
1085          *
1086          * @param pack
1087          *              The pack being downloaded
1088          * @param bot
1089          *              The bot the pack is being downloaded from
1090          * @return The download, or {@link Optional#absent()} if the download could not
1091          *         be found
1092          */
1093         private Optional<Download> getDownload(Pack pack, Bot bot) {
1094                 if (!downloads.containsKey(pack.name())) {
1095                         return Optional.absent();
1096                 }
1097                 for (Download download : Lists.newArrayList(downloads.get(pack.name()))) {
1098                         if (download.bot().equals(bot)) {
1099                                 return Optional.of(download);
1100                         }
1101                 }
1102                 return Optional.absent();
1103         }
1104
1105         /**
1106          * Searches all current connections for the given connection, returning the
1107          * associated network.
1108          *
1109          * @param connection
1110          *              The connection to get the network for
1111          * @return The network belonging to the connection, or {@link
1112          *         Optional#absent()}
1113          */
1114         private Optional<Network> getNetwork(Connection connection) {
1115                 for (Entry<Network, Connection> networkConnectionEntry : networkConnections.entrySet()) {
1116                         if (networkConnectionEntry.getValue().equals(connection)) {
1117                                 return Optional.of(networkConnectionEntry.getKey());
1118                         }
1119                 }
1120                 return Optional.absent();
1121         }
1122
1123         /**
1124          * Returns the configured channel for the given network and name.
1125          *
1126          * @param network
1127          *              The network the channel is located on
1128          * @param channelName
1129          *              The name of the channel
1130          * @return The configured channel, or {@link Optional#absent()} if no
1131          *         configured channel matching the given network and name was found
1132          */
1133         public Optional<Channel> getChannel(Network network, String channelName) {
1134                 for (Channel channel : channels) {
1135                         if (channel.network().equals(network) && (channel.name().equalsIgnoreCase(channelName))) {
1136                                 return Optional.of(channel);
1137                         }
1138                 }
1139                 return Optional.absent();
1140         }
1141
1142         /**
1143          * Returns the extra channel for the given network and name.
1144          *
1145          * @param network
1146          *              The network the channel is located on
1147          * @param channelName
1148          *              The name of the channel
1149          * @return The extra channel, or {@link Optional#absent()} if no extra channel
1150          *         matching the given network and name was found
1151          */
1152         public Optional<Channel> getExtraChannel(Network network, String channelName) {
1153                 for (Channel channel : extraChannels) {
1154                         if (channel.network().equals(network) && (channel.name().equalsIgnoreCase(channelName))) {
1155                                 return Optional.of(channel);
1156                         }
1157                 }
1158                 return Optional.absent();
1159         }
1160
1161         /**
1162          * Parses {@link Pack} information from the given message.
1163          *
1164          * @param message
1165          *              The message to parse pack information from
1166          * @return The parsed pack, or {@link Optional#absent()} if the message could
1167          *         not be parsed into a pack
1168          */
1169         private Optional<Pack> parsePack(String message) {
1170                 int squareOpen = message.indexOf('[');
1171                 int squareClose = message.indexOf(']', squareOpen);
1172                 if ((squareOpen == -1) && (squareClose == -1)) {
1173                         return Optional.absent();
1174                 }
1175                 String packSize = message.substring(squareOpen + 1, squareClose);
1176                 String packName = message.substring(message.lastIndexOf(' ') + 1);
1177                 String packIndex = message.substring(0, message.indexOf(' ')).substring(1);
1178                 return Optional.of(new Pack(packIndex, packSize, packName));
1179         }
1180
1181 }