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

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