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