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

   1 /*
   2  * XdccDownloader - Core.java - Copyright © 2013 David Roden
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 package net.pterodactylus.xdcc.core;
  19
  20 import static java.lang.String.format;
  21 import static net.pterodactylus.irc.event.ChannelNotJoined.Reason.banned;
  22 import static net.pterodactylus.irc.event.ChannelNotJoined.Reason.registeredNicknamesOnly;
  23 import static net.pterodactylus.irc.util.MessageCleaner.getDefaultInstance;
  24 import static net.pterodactylus.xdcc.data.Channel.TO_NETWORK;
  25 import static net.pterodactylus.xdcc.data.Download.FILTER_RUNNING;
  26
  27 import java.io.File;
  28 import java.io.FileNotFoundException;
  29 import java.io.FileOutputStream;
  30 import java.io.IOException;
  31 import java.io.OutputStream;
  32 import java.util.Collection;
  33 import java.util.Collections;
  34 import java.util.Iterator;
  35 import java.util.List;
  36 import java.util.Map;
  37 import java.util.Map.Entry;
  38 import java.util.concurrent.TimeUnit;
  39 import java.util.stream.Collectors;
  40
  41 import net.pterodactylus.irc.Connection;
  42 import net.pterodactylus.irc.ConnectionFactory;
  43 import net.pterodactylus.irc.DccReceiver;
  44 import net.pterodactylus.irc.DefaultConnection;
  45 import net.pterodactylus.irc.event.ChannelJoined;
  46 import net.pterodactylus.irc.event.ChannelLeft;
  47 import net.pterodactylus.irc.event.ChannelMessageReceived;
  48 import net.pterodactylus.irc.event.ChannelNotJoined;
  49 import net.pterodactylus.irc.event.ClientQuit;
  50 import net.pterodactylus.irc.event.ConnectionClosed;
  51 import net.pterodactylus.irc.event.ConnectionEstablished;
  52 import net.pterodactylus.irc.event.ConnectionFailed;
  53 import net.pterodactylus.irc.event.DccAcceptReceived;
  54 import net.pterodactylus.irc.event.DccDownloadFailed;
  55 import net.pterodactylus.irc.event.DccDownloadFinished;
  56 import net.pterodactylus.irc.event.DccSendReceived;
  57 import net.pterodactylus.irc.event.KickedFromChannel;
  58 import net.pterodactylus.irc.event.NicknameChanged;
  59 import net.pterodactylus.irc.event.PrivateMessageReceived;
  60 import net.pterodactylus.irc.event.PrivateNoticeReceived;
  61 import net.pterodactylus.irc.event.ReplyReceived;
  62 import net.pterodactylus.irc.util.RandomNickname;
  63 import net.pterodactylus.xdcc.core.event.BotAdded;
  64 import net.pterodactylus.xdcc.core.event.CoreStarted;
  65 import net.pterodactylus.xdcc.core.event.DownloadFailed;
  66 import net.pterodactylus.xdcc.core.event.DownloadFinished;
  67 import net.pterodactylus.xdcc.core.event.DownloadStarted;
  68 import net.pterodactylus.xdcc.core.event.GenericError;
  69 import net.pterodactylus.xdcc.core.event.GenericMessage;
  70 import net.pterodactylus.xdcc.core.event.MessageReceived;
  71 import net.pterodactylus.xdcc.data.Bot;
  72 import net.pterodactylus.xdcc.data.Channel;
  73 import net.pterodactylus.xdcc.data.ConnectedNetwork;
  74 import net.pterodactylus.xdcc.data.Download;
  75 import net.pterodactylus.xdcc.data.Network;
  76 import net.pterodactylus.xdcc.data.Pack;
  77 import net.pterodactylus.xdcc.data.Server;
  78
  79 import com.google.common.base.Optional;
  80 import com.google.common.base.Predicate;
  81 import com.google.common.collect.FluentIterable;
  82 import com.google.common.collect.HashBasedTable;
  83 import com.google.common.collect.HashMultimap;
  84 import com.google.common.collect.ImmutableList;
  85 import com.google.common.collect.ImmutableSet;
  86 import com.google.common.collect.Lists;
  87 import com.google.common.collect.Maps;
  88 import com.google.common.collect.Multimap;
  89 import com.google.common.collect.Sets;
  90 import com.google.common.collect.Table;
  91 import com.google.common.eventbus.EventBus;
  92 import com.google.common.eventbus.Subscribe;
  93 import com.google.common.io.Closeables;
  94 import com.google.common.util.concurrent.AbstractExecutionThreadService;
  95 import com.google.inject.Inject;
  96 import org.apache.log4j.Logger;
  97
  98 /**
  99  * The core of XDCC Downloader.
 100  *
 101  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
 102  */
 103 public class Core extends AbstractExecutionThreadService {
 104
 105         /** The logger. */
 106         private static final Logger logger = Logger.getLogger(Core.class.getName());
 107
 108         private final Object syncObject = new Object();
 109         /** The event bus. */
 110         private final EventBus eventBus;
 111         private final ConnectionFactory connectionFactory;
 112         private final ChannelBanManager channelBanManager =
 113                         new ChannelBanManager();
 114
 115         /** The temporary directory to download files to. */
 116         private final String temporaryDirectory;
 117
 118         /** The directory to move finished downloads to. */
 119         private final String finalDirectory;
 120
 121         /** The channels that should be monitored. */
 122         private final Collection<Channel> channels = Sets.newHashSet();
 123
 124         /** The channels that are currentlymonitored. */
 125         private final Collection<Channel> joinedChannels = Sets.newHashSet();
 126
 127         /** The channels that are joined but not configured. */
 128         private final Collection<Channel> extraChannels = Sets.newHashSet();
 129
 130         /** The current network connections. */
 131         private final Map<Network, Connection> networkConnections = Collections.synchronizedMap(Maps.<Network, Connection>newHashMap());
 132
 133         /** The currently known bots. */
 134         private final Table<Network, String, Bot> networkBots = HashBasedTable.create();
 135
 136         /** The current downloads. */
 137         private final Multimap<String, Download> downloads = HashMultimap.create();
 138
 139         /** The current DCC receivers. */
 140         private final Collection<DccReceiver> dccReceivers = Lists.newArrayList();
 141
 142         /**
 143          * Creates a new core.
 144          *
 145          * @param eventBus
 146          *              The event bus
 147          * @param temporaryDirectory
 148          *              The directory to download files to
 149          * @param finalDirectory
 150          *              The directory to move finished files to
 151          */
 152         @Inject
 153         public Core(EventBus eventBus, ConnectionFactory connectionFactory, String temporaryDirectory, String finalDirectory) {
 154                 this.eventBus = eventBus;
 155                 this.connectionFactory = connectionFactory;
 156                 this.temporaryDirectory = temporaryDirectory;
 157                 this.finalDirectory = finalDirectory;
 158         }
 159
 160         //
 161         // ACCESSORS
 162         //
 163
 164         /**
 165          * Returns all currently known connections.
 166          *
 167          * @return All currently known connections
 168          */
 169         public Collection<Connection> connections() {
 170                 return networkConnections.values();
 171         }
 172
 173         /**
 174          * Returns all defined networks.
 175          *
 176          * @return All defined networks
 177          */
 178         public Collection<Network> networks() {
 179                 return FluentIterable.from(channels).transform(TO_NETWORK).toSet();
 180         }
 181
 182         /**
 183          * Returns all connected networks.
 184          *
 185          * @return All connected networks
 186          */
 187         public Collection<ConnectedNetwork> connectedNetworks() {
 188                 return networkConnections.entrySet().stream().map((entry) -> {
 189                         Network network = entry.getKey();
 190                         Collection<Bot> bots = networkBots.row(network).values();
 191                         int packCount = bots.stream().mapToInt((bot) -> bot.packs().size()).reduce((a, b) -> a + b).orElse(0);
 192                         return new ConnectedNetwork(network, entry.getValue().hostname(),
 193                                         entry.getValue().port(), entry.getValue().nickname(),
 194                                         channels.stream()
 195                                                         .filter((channel) -> channel.network()
 196                                                                         .equals(network))
 197                                                         .map(Channel::name)
 198                                                         .collect(Collectors.<String>toList()),
 199                                         extraChannels.stream()
 200                                                         .filter((channel) -> channel.network()
 201                                                                         .equals(network))
 202                                                         .map(Channel::name)
 203                                                         .collect(Collectors.<String>toList()),
 204                                         bots.size(), packCount);
 205                 }).collect(Collectors.<ConnectedNetwork>toList());
 206         }
 207
 208         /**
 209          * Returns all configured channels. Due to various circumstances, configured
 210          * channels might not actually be joined.
 211          *
 212          * @return All configured channels
 213          */
 214         public Collection<Channel> channels() {
 215                 return ImmutableSet.copyOf(channels);
 216         }
 217
 218         /**
 219          * Returns all currently joined channels.
 220          *
 221          * @return All currently joined channels
 222          */
 223         public Collection<Channel> joinedChannels() {
 224                 return ImmutableSet.copyOf(joinedChannels);
 225         }
 226
 227         /**
 228          * Returns all currently joined channels that are not configured.
 229          *
 230          * @return All currently joined but not configured channels
 231          */
 232         public Collection<Channel> extraChannels() {
 233                 return ImmutableSet.copyOf(extraChannels);
 234         }
 235
 236         /**
 237          * Returns all currently known bots.
 238          *
 239          * @return All currently known bots
 240          */
 241         public Collection<Bot> bots() {
 242                 return networkBots.values();
 243         }
 244
 245         /**
 246          * Returns all currently running downloads.
 247          *
 248          * @return All currently running downloads
 249          */
 250         public Collection<Download> downloads() {
 251                 return downloads.values();
 252         }
 253
 254         //
 255         // ACTIONS
 256         //
 257
 258         /**
 259          * Adds a channel to monitor.
 260          *
 261          * @param channel
 262          *              The channel to monitor
 263          */
 264         public void addChannel(Channel channel) {
 265                 channels.add(channel);
 266         }
 267
 268         /**
 269          * Fetches the given pack from the given bot.
 270          *
 271          * @param bot
 272          *              The bot to fetch the pack from
 273          * @param pack
 274          *              The pack to fetch
 275          */
 276         public void fetch(Bot bot, Pack pack) {
 277                 Connection connection = networkConnections.get(bot.network());
 278                 if (connection == null) {
 279                         return;
 280                 }
 281
 282                 /* check if we are already downloading the file? */
 283                 if (downloads.containsKey(pack.name())) {
 284                         Collection<Download> packDownloads = downloads.get(pack.name());
 285                         Collection<Download> runningDownloads = FluentIterable.from(packDownloads).filter(FILTER_RUNNING).toSet();
 286                         if (!runningDownloads.isEmpty()) {
 287                                 Download download = runningDownloads.iterator().next();
 288                                 eventBus.post(new GenericMessage(String.format("File %s is already downloading from %s (%s).", pack.name(), download.bot().name(), download.bot().network().name())));
 289                                 return;
 290                         }
 291                         StringBuilder bots = new StringBuilder();
 292                         for (Download download : packDownloads) {
 293                                 if (bots.length() > 0) {
 294                                         bots.append(", ");
 295                                 }
 296                                 bots.append(download.bot().name()).append(" (").append(download.bot().network().name()).append(')');
 297                         }
 298                         eventBus.post(new GenericMessage(String.format("File %s is already requested from %d bots (%s).", pack.name(), packDownloads.size(), bots.toString())));
 299                 }
 300
 301                 Download download = new Download(bot, pack);
 302                 downloads.put(pack.name(), download);
 303
 304                 try {
 305                         connection.sendMessage(bot.name(), "XDCC SEND " + pack.id());
 306                 } catch (IOException ioe1) {
 307                         logger.warn("Could not send message to bot!", ioe1);
 308                 }
 309         }
 310
 311         /**
 312          * Cancels the download of the given pack from the given bot.
 313          *
 314          * @param bot
 315          *              The bot the pack is being downloaded from
 316          * @param pack
 317          *              The pack being downloaded
 318          */
 319         public void cancelDownload(Bot bot, Pack pack) {
 320                 Optional<Download> download = getDownload(pack, bot);
 321                 if (!download.isPresent()) {
 322                         return;
 323                 }
 324
 325                 /* get connection. */
 326                 Connection connection = networkConnections.get(bot.network());
 327                 if (connection == null) {
 328                         /* request for unknown network? */
 329                         return;
 330                 }
 331
 332                 /* stop the DCC receiver. */
 333                 if (download.get().dccReceiver() != null) {
 334                         download.get().dccReceiver().stop();
 335                 } else {
 336                         /* remove download if it hasn’t started yet. */
 337                         downloads.remove(pack.name(), download.get());
 338                 }
 339
 340                 /* remove the request from the bot, too. */
 341                 try {
 342                         connection.sendMessage(bot.name(), String.format("XDCC %s", (download.get().dccReceiver() != null) ? "CANCEL" : "REMOVE"));
 343                 } catch (IOException ioe1) {
 344                         logger.warn(String.format("Could not cancel DCC from %s (%s)!", bot.name(), bot.network().name()), ioe1);
 345                 }
 346         }
 347
 348         /**
 349          * Closes the given connection.
 350          *
 351          * @param connection
 352          *              The connection to close
 353          */
 354         public void closeConnection(Connection connection) {
 355                 try {
 356                         connection.close();
 357                 } catch (IOException ioe1) {
 358                         /* TODO */
 359                 }
 360         }
 361
 362         //
 363         // ABSTRACTIDLESERVICE METHODS
 364         //
 365
 366         @Override
 367         protected void startUp() {
 368                 for (Channel channel : channels) {
 369                         logger.info(String.format("Connecting to Channel %s on Network %s…", channel.name(), channel.network().name()));
 370                         connectNetwork(channel.network());
 371                 }
 372
 373                 /* notify listeners. */
 374                 eventBus.post(new CoreStarted(this));
 375         }
 376
 377         @Override
 378         protected void run() throws Exception {
 379                 while (isRunning()) {
 380                         synchronized (syncObject) {
 381                                 try {
 382                                         syncObject.wait(TimeUnit.MINUTES.toMillis(1));
 383                                 } catch (InterruptedException ie1) {
 384                                         /* ignore. */
 385                                 }
 386                         }
 387                         if (!isRunning()) {
 388                                 break;
 389                         }
 390
 391                         /* find channels that should be monitored but are not. */
 392                         for (Channel channel : channels) {
 393                                 if (joinedChannels.contains(channel)) {
 394                                         continue;
 395                                 }
 396
 397                                 /* are we banned from this channel? */
 398                                 if (channelBanManager.isBanned(channel)) {
 399                                         continue;
 400                                 }
 401
 402                                 connectNetwork(channel.network());
 403                                 Connection connection = networkConnections.get(channel.network());
 404                                 if (connection.established()) {
 405                                         eventBus.post(new GenericMessage(String.format("Trying to join %s on %s.", channel.name(), channel.network().name())));
 406                                         try {
 407                                                 connection.joinChannel(channel.name());
 408                                         } catch (IOException ioe1) {
 409                                                 eventBus.post(new GenericMessage(String.format("Could not join %s on %s.", channel.name(), channel.network().name())));
 410                                         }
 411                                 }
 412                         }
 413                 }
 414         }
 415
 416         @Override
 417         protected void triggerShutdown() {
 418                 synchronized (syncObject) {
 419                         syncObject.notifyAll();
 420                 }
 421         }
 422
 423         //
 424         // PRIVATE METHODS
 425         //
 426
 427         /**
 428          * Starts a new connection for the given network if no such connection exists
 429          * already.
 430          *
 431          * @param network
 432          *              The network to connect to
 433          */
 434         private void connectNetwork(Network network) {
 435                 if (!networkConnections.containsKey(network)) {
 436                                 /* select a random server. */
 437                         List<Server> servers = Lists.newArrayList(network.servers());
 438                         if (servers.isEmpty()) {
 439                                 eventBus.post(new GenericError(String.format("Network %s does not have any servers.", network.name())));
 440                                 return;
 441                         }
 442                         Server server = servers.get((int) (Math.random() * servers.size()));
 443                         Connection connection = connectionFactory.createConnection(server.hostname(),
 444                                         server.unencryptedPorts().iterator().next());
 445                         connection.username(RandomNickname.get()).realName(RandomNickname.get());
 446                         networkConnections.put(network, connection);
 447                         connection.open();
 448                 }
 449         }
 450
 451         /**
 452          * Removes the given connection and all its channels and bots.
 453          *
 454          * @param connection
 455          *              The connection to remove
 456          */
 457         private void removeConnection(Connection connection) {
 458                 Optional<Network> network = getNetwork(connection);
 459                 if (!network.isPresent()) {
 460                         return;
 461                 }
 462                 if (!connection.established()) {
 463                         return;
 464                 }
 465
 466                 /* find all channels that need to be removed. */
 467                 for (Collection<Channel> channels : ImmutableList.of(joinedChannels, extraChannels)) {
 468                         for (Iterator<Channel> channelIterator = channels.iterator(); channelIterator.hasNext(); ) {
 469                                 Channel joinedChannel = channelIterator.next();
 470                                 if (!joinedChannel.network().equals(network.get())) {
 471                                         continue;
 472                                 }
 473
 474                                 channelIterator.remove();
 475                         }
 476                 }
 477
 478                 /* now remove all bots for that network. */
 479                 Map<String, Bot> bots = networkBots.row(network.get());
 480                 int botCount = bots.size();
 481                 int packCount = 0;
 482                 for (Bot bot : bots.values()) {
 483                         packCount += bot.packs().size();
 484                 }
 485                 bots.clear();
 486                 eventBus.post(new GenericMessage(String.format("Network %s disconnected, %d bots removed, %d packs removed.", network.get().name(), botCount, packCount)));
 487
 488                 /* now remove the network. */
 489                 networkConnections.remove(network.get());
 490         }
 491
 492         //
 493         // EVENT HANDLERS
 494         //
 495
 496         /**
 497          * If a connection to a network has been established, the channels associated
 498          * with this network are joined.
 499          *
 500          * @param connectionEstablished
 501          *              The connection established event
 502          */
 503         @Subscribe
 504         public void connectionEstablished(ConnectionEstablished connectionEstablished) {
 505
 506                 /* get network for connection. */
 507                 Optional<Network> network = getNetwork(connectionEstablished.connection());
 508
 509                 /* found network? */
 510                 if (!network.isPresent()) {
 511                         eventBus.post(new GenericMessage(String.format("Connected to unknown network: %s", connectionEstablished.connection().hostname())));
 512                         return;
 513                 }
 514
 515                 eventBus.post(new GenericMessage(String.format("Connected to network %s.", network.get().name())));
 516
 517                 /* join all channels on this network. */
 518                 for (Channel channel : channels) {
 519                         if (channel.network().equals(network.get())) {
 520                                 try {
 521                                         eventBus.post(new GenericMessage(String.format("Trying to join %s on %s...", channel.name(), network.get().name())));
 522                                         connectionEstablished.connection().joinChannel(channel.name());
 523                                 } catch (IOException ioe1) {
 524                                         logger.warn(String.format("Could not join %s on %s!", channel.name(), network.get().name()), ioe1);
 525                                 }
 526                         }
 527                 }
 528         }
 529
 530         /**
 531          * Remove all data stored for a network if the connection is closed.
 532          *
 533          * @param connectionClosed
 534          *              The connection closed event
 535          */
 536         @Subscribe
 537         public void connectionClosed(ConnectionClosed connectionClosed) {
 538                 removeConnection(connectionClosed.connection());
 539                 eventBus.post(new GenericMessage(String.format("Connection closed by %s.", connectionClosed.connection().hostname())));
 540         }
 541
 542         /**
 543          * Remove all data stored for a network if the connection fails.
 544          *
 545          * @param connectionFailed
 546          *              The connection failed event
 547          */
 548         @Subscribe
 549         public void connectionFailed(ConnectionFailed connectionFailed) {
 550                 removeConnection(connectionFailed.connection());
 551                 eventBus.post(new GenericMessage(String.format("Could not connect to %s: %s.", connectionFailed.connection().hostname(), connectionFailed.cause())));
 552         }
 553
 554         /**
 555          * Shows a message when a channel was joined by us.
 556          *
 557          * @param channelJoined
 558          *              The channel joined event
 559          */
 560         @Subscribe
 561         public void channelJoined(ChannelJoined channelJoined) {
 562                 if (channelJoined.connection().isSource(channelJoined.client())) {
 563                         Optional<Network> network = getNetwork(channelJoined.connection());
 564                         if (!network.isPresent()) {
 565                                 return;
 566                         }
 567
 568                         Optional<Channel> channel = getChannel(network.get(), channelJoined.channel());
 569                         if (!channel.isPresent()) {
 570                                 /* it’s an extra channel. */
 571                                 extraChannels.add(new Channel(network.get(), channelJoined.channel()));
 572                                 logger.info(String.format("Joined extra Channel %s on %s.", channelJoined.channel(), network.get().name()));
 573                                 return;
 574                         }
 575
 576                         channelBanManager.unban(channel.get());
 577                         joinedChannels.add(channel.get());
 578                         logger.info(String.format("Joined Channel %s on %s.", channelJoined.channel(), network.get().name()));
 579                 }
 580         }
 581
 582         @Subscribe
 583         public void channelNotJoined(ChannelNotJoined channelNotJoined) {
 584                 Optional<Network> network = getNetwork(channelNotJoined.connection());
 585                 if (!network.isPresent()) {
 586                         return;
 587                 }
 588
 589                 Optional<Channel> channel = getChannel(network.get(), channelNotJoined.channel());
 590                 if (!channel.isPresent()) {
 591                         eventBus.post(new GenericMessage(format("Could not join %s but didn’t try to join, either.", channel.get())));
 592                         return;
 593                 }
 594
 595                 /* remove all bots for this channel, we might have been kicked. */
 596                 Collection<Bot> botsToRemove = networkBots.row(network.get())
 597                                 .values().stream()
 598                                 .filter(bot -> bot.channel()
 599                                                 .equalsIgnoreCase(channel.get().name()))
 600                                 .collect(Collectors.toSet());
 601                 botsToRemove.stream()
 602                                 .forEach(bot -> networkBots.row(network.get())
 603                                                 .remove(bot.name()));
 604
 605                 if (channelNotJoined.reason() == registeredNicknamesOnly) {
 606                         channels.remove(channel.get());
 607                         eventBus.post(new GenericMessage(
 608                                         format("Not trying to join %s anymore.", channel.get())));
 609                         return;
 610                 }
 611                 if (channelNotJoined.reason() == banned) {
 612                         channelBanManager.ban(channel.get());
 613                         eventBus.post(new GenericMessage(
 614                                         format("Banned from %s, suspending join for a day.",
 615                                                         channel.get())));
 616                         return;
 617                 }
 618
 619                 eventBus.post(new GenericMessage(
 620                                 format("Could not join %s: %s", channelNotJoined.channel(),
 621                                                 channelNotJoined.reason())));
 622         }
 623
 624         /**
 625          * Removes bots that leave a channel, or channels when it’s us that’s leaving.
 626          *
 627          * @param channelLeft
 628          *              The channel left event
 629          */
 630         @Subscribe
 631         public void channelLeft(ChannelLeft channelLeft) {
 632                 Optional<Network> network = getNetwork(channelLeft.connection());
 633                 if (!network.isPresent()) {
 634                         return;
 635                 }
 636
 637                 Bot bot = networkBots.get(network.get(), channelLeft.client().nick().get());
 638                 if (bot == null) {
 639                         /* maybe it was us? */
 640                         if (channelLeft.connection().isSource(channelLeft.client())) {
 641                                 Optional<Channel> channel = getChannel(network.get(), channelLeft.channel());
 642                                 if (!channel.isPresent()) {
 643                                         /* maybe it was an extra channel? */
 644                                         channel = getExtraChannel(network.get(), channelLeft.channel());
 645                                         if (!channel.isPresent()) {
 646                                                 /* okay, whatever. */
 647                                                 return;
 648                                         }
 649
 650                                         extraChannels.remove(channel);
 651                                 } else {
 652                                         channels.remove(channel.get());
 653                                 }
 654
 655                                 eventBus.post(new GenericMessage(String.format("Left Channel %s on %s.", channel.get().name(), channel.get().network().name())));
 656                         }
 657
 658                         return;
 659                 }
 660
 661                 networkBots.remove(network.get(), channelLeft.client().nick().get());
 662         }
 663
 664         @Subscribe
 665         public void kickedFromChannel(KickedFromChannel kickedFromChannel) {
 666                 Optional<Network> network = getNetwork(kickedFromChannel.connection());
 667                 if (!network.isPresent()) {
 668                         return;
 669                 }
 670
 671                 /* have we been kicked? */
 672                 if (nicknameMatchesConnection(kickedFromChannel.connection(), kickedFromChannel.kickee())) {
 673                         Optional<Channel> channel = getChannel(network.get(), kickedFromChannel.channel());
 674                         if (!channel.isPresent()) {
 675                                 /* maybe it was an extra channel? */
 676                                 channel = getExtraChannel(network.get(), kickedFromChannel.channel());
 677                                 if (!channel.isPresent()) {
 678                                         /* okay, whatever. */
 679                                         return;
 680                                 }
 681
 682                                 extraChannels.remove(channel.get());
 683                         } else {
 684                                 joinedChannels.remove(channel.get());
 685                         }
 686                         eventBus.post(new GenericMessage(format(
 687                                         "Kicked from %s by %s: %s",
 688                                         kickedFromChannel.channel(),
 689                                         kickedFromChannel.kicker(),
 690                                         kickedFromChannel.reason().or("<unknown>")
 691                         )));
 692                 }
 693         }
 694
 695         private boolean nicknameMatchesConnection(Connection connection, String nickname) {
 696                 return connection.nickname().equalsIgnoreCase(nickname);
 697         }
 698
 699         /**
 700          * Removes a client (which may be a bot) from the table of known bots.
 701          *
 702          * @param clientQuit
 703          *              The client quit event
 704          */
 705         @Subscribe
 706         public void clientQuit(ClientQuit clientQuit) {
 707                 Optional<Network> network = getNetwork(clientQuit.connection());
 708                 if (!network.isPresent()) {
 709                         return;
 710                 }
 711
 712                 networkBots.remove(network.get(), clientQuit.client().nick().get());
 713         }
 714
 715         /**
 716          * If the nickname of a bit changes, remove it from the old name and store it
 717          * under the new name.
 718          *
 719          * @param nicknameChanged
 720          *              The nickname changed event
 721          */
 722         @Subscribe
 723         public void nicknameChanged(NicknameChanged nicknameChanged) {
 724                 Optional<Network> network = getNetwork(nicknameChanged.connection());
 725                 if (!network.isPresent()) {
 726                         return;
 727                 }
 728
 729                 Bot bot = networkBots.remove(network.get(), nicknameChanged.client().nick().get());
 730                 if (bot == null) {
 731                         return;
 732                 }
 733
 734                 networkBots.put(network.get(), nicknameChanged.newNickname(), bot);
 735         }
 736
 737         /**
 738          * If a message on a channel is received, it is parsed for pack information
 739          * with is then added to a bot.
 740          *
 741          * @param channelMessageReceived
 742          *              The channel message received event
 743          */
 744         @Subscribe
 745         public void channelMessageReceived(ChannelMessageReceived channelMessageReceived) {
 746                 String message = getDefaultInstance().clean(channelMessageReceived.message());
 747                 if (!message.startsWith("#")) {
 748                         /* most probably not a pack announcement. */
 749                         return;
 750                 }
 751
 752                 Optional<Network> network = getNetwork(channelMessageReceived.connection());
 753                 if (!network.isPresent()) {
 754                         /* message for unknown connection? */
 755                         return;
 756                 }
 757
 758                 /* parse pack information. */
 759                 Optional<Pack> pack = parsePack(message);
 760                 if (!pack.isPresent()) {
 761                         return;
 762                 }
 763
 764                 Bot bot;
 765                 synchronized (networkBots) {
 766                         if (!networkBots.contains(network.get(), channelMessageReceived.source().nick().get())) {
 767                                 bot = new Bot(network.get(), channelMessageReceived.channel(),
 768                                                 channelMessageReceived.source().nick().get());
 769                                 networkBots.put(network.get(), channelMessageReceived.source().nick().get(), bot);
 770                                 eventBus.post(new BotAdded(bot));
 771                         } else {
 772                                 bot = networkBots.get(network.get(), channelMessageReceived.source().nick().get());
 773                         }
 774                 }
 775
 776                 /* add pack. */
 777                 bot.addPack(pack.get());
 778                 logger.debug(String.format("Bot %s now has %d packs.", bot, bot.packs().size()));
 779         }
 780
 781         /**
 782          * Forward all private messages to every console.
 783          *
 784          * @param privateMessageReceived
 785          *              The private message recevied event
 786          */
 787         @Subscribe
 788         public void privateMessageReceived(PrivateMessageReceived privateMessageReceived) {
 789                 eventBus.post(new MessageReceived(privateMessageReceived.source(), privateMessageReceived.message()));
 790         }
 791
 792         /**
 793          * Sends a message to all console when a notice was received.
 794          *
 795          * @param privateNoticeReceived
 796          *              The notice received event
 797          */
 798         @Subscribe
 799         public void privateNoticeReceived(PrivateNoticeReceived privateNoticeReceived) {
 800                 Optional<Network> network = getNetwork(privateNoticeReceived.connection());
 801                 if (!network.isPresent()) {
 802                         return;
 803                 }
 804
 805                 eventBus.post(new GenericMessage(String.format("Notice from %s (%s): %s", privateNoticeReceived.source(), network.get(), privateNoticeReceived.text())));
 806         }
 807
 808         /**
 809          * Starts a DCC download.
 810          *
 811          * @param dccSendReceived
 812          *              The DCC SEND event
 813          */
 814         @Subscribe
 815         public void dccSendReceived(final DccSendReceived dccSendReceived) {
 816                 final Optional<Network> network = getNetwork(dccSendReceived.connection());
 817                 if (!network.isPresent()) {
 818                         return;
 819                 }
 820
 821                 Collection<Download> packDownloads = downloads.get(dccSendReceived.filename());
 822                 if (packDownloads.isEmpty()) {
 823                         /* unknown download, ignore. */
 824                         return;
 825                 }
 826
 827                 /* check if it’s already downloading. */
 828                 Collection<Download> runningDownloads = FluentIterable.from(packDownloads).filter(FILTER_RUNNING).toSet();
 829                 if (!runningDownloads.isEmpty()) {
 830                         eventBus.post(new GenericMessage(String.format("Ignoring offer for %s, it’s already being downloaded.", dccSendReceived.filename())));
 831                         return;
 832                 }
 833
 834                 /* locate the correct download. */
 835                 Collection<Download> requestedDownload = FluentIterable.from(packDownloads).filter(new Predicate<Download>() {
 836
 837                         @Override
 838                         public boolean apply(Download download) {
 839                                 return download.bot().network().equals(network.get()) && download.bot().name().equalsIgnoreCase(dccSendReceived.source().nick().get());
 840                         }
 841                 }).toSet();
 842
 843                 /* we did not request this download. */
 844                 if (requestedDownload.isEmpty()) {
 845                         return;
 846                 }
 847
 848                 Download download = requestedDownload.iterator().next();
 849
 850                 /* check if the file already exists. */
 851                 File outputFile = new File(temporaryDirectory, dccSendReceived.filename());
 852                 if (outputFile.exists()) {
 853                         long existingFileSize = outputFile.length();
 854
 855                         /* file already complete? */
 856                         if ((dccSendReceived.filesize() > -1) && (existingFileSize >= dccSendReceived.filesize())) {
 857                                 /* file is apparently already complete. just move it. */
 858                                 if (outputFile.renameTo(new File(finalDirectory, download.pack().name()))) {
 859                                         eventBus.post(new GenericMessage(String.format("File %s already downloaded.", download.pack().name())));
 860                                 } else {
 861                                         eventBus.post(new GenericMessage(String.format("File %s already downloaded but not moved to %s.", download.pack().name(), finalDirectory)));
 862                                 }
 863
 864                                 /* remove download. */
 865                                 downloads.removeAll(download.pack().name());
 866                                 return;
 867                         }
 868
 869                         /* file not complete yet, DCC resume it. */
 870                         try {
 871                                 download.remoteAddress(dccSendReceived.inetAddress()).filesize(dccSendReceived.filesize());
 872                                 dccSendReceived.connection().sendDccResume(dccSendReceived.source().nick().get(), dccSendReceived.filename(), dccSendReceived.port(), existingFileSize);
 873                         } catch (IOException ioe1) {
 874                                 eventBus.post(new GenericError(String.format("Could not send DCC RESUME %s to %s (%s).", dccSendReceived.filename(), dccSendReceived.source().nick().get(), ioe1.getMessage())));
 875                         }
 876
 877                         return;
 878                 }
 879
 880                 /* file does not exist, start the download. */
 881                 try {
 882                         OutputStream fileOutputStream = new FileOutputStream(outputFile);
 883                         DccReceiver dccReceiver = new DccReceiver(eventBus, dccSendReceived.inetAddress(), dccSendReceived.port(), dccSendReceived.filename(), dccSendReceived.filesize(), fileOutputStream);
 884                         download.filename(outputFile.getPath()).outputStream(fileOutputStream).dccReceiver(dccReceiver);
 885                         dccReceivers.add(dccReceiver);
 886                         dccReceiver.start();
 887                         eventBus.post(new DownloadStarted(download));
 888                 } catch (FileNotFoundException fnfe1) {
 889                         eventBus.post(new GenericError(String.format("Could not start download of %s from %s (%s).", dccSendReceived.filename(), dccSendReceived.source().nick().get(), fnfe1.getMessage())));
 890                 }
 891         }
 892
 893         @Subscribe
 894         public void dccAcceptReceived(final DccAcceptReceived dccAcceptReceived) {
 895                 final Optional<Network> network = getNetwork(dccAcceptReceived.connection());
 896                 if (!network.isPresent()) {
 897                         return;
 898                 }
 899
 900                 Collection<Download> packDownloads = downloads.get(dccAcceptReceived.filename());
 901                 if (packDownloads.isEmpty()) {
 902                         /* unknown download, ignore. */
 903                         return;
 904                 }
 905
 906                 /* check if it’s already downloading. */
 907                 Collection<Download> runningDownloads = FluentIterable.from(packDownloads).filter(FILTER_RUNNING).toSet();
 908                 if (!runningDownloads.isEmpty()) {
 909                         eventBus.post(new GenericMessage(String.format("Ignoring offer for %s, it’s already being downloaded.", dccAcceptReceived.filename())));
 910                         return;
 911                 }
 912
 913                 /* locate the correct download. */
 914                 Collection<Download> requestedDownload = FluentIterable.from(packDownloads).filter(new Predicate<Download>() {
 915
 916                         @Override
 917                         public boolean apply(Download download) {
 918                                 return download.bot().network().equals(network.get()) && download.bot().name().equalsIgnoreCase(dccAcceptReceived.source().nick().get());
 919                         }
 920                 }).toSet();
 921
 922                 /* we did not request this download. */
 923                 if (requestedDownload.isEmpty()) {
 924                         return;
 925                 }
 926
 927                 Download download = requestedDownload.iterator().next();
 928
 929                 try {
 930                         File outputFile = new File(temporaryDirectory, dccAcceptReceived.filename());
 931                         if (outputFile.length() != dccAcceptReceived.position()) {
 932                                 eventBus.post(new GenericError(String.format("Download %s from %s does not start at the right position!")));
 933                                 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()));
 934
 935                                 downloads.removeAll(download.pack().name());
 936                                 return;
 937                         }
 938                         OutputStream outputStream = new FileOutputStream(outputFile, true);
 939                         DccReceiver dccReceiver = new DccReceiver(eventBus, download.remoteAddress(), dccAcceptReceived.port(), dccAcceptReceived.filename(), dccAcceptReceived.position(), download.filesize(), outputStream);
 940                         download.filename(outputFile.getPath()).outputStream(outputStream).dccReceiver(dccReceiver);
 941                         dccReceivers.add(dccReceiver);
 942                         dccReceiver.start();
 943                         eventBus.post(new DownloadStarted(download));
 944                 } catch (FileNotFoundException fnfe1) {
 945                 }
 946         }
 947
 948         /**
 949          * Closes the output stream of the download and moves the file to the final
 950          * location.
 951          *
 952          * @param dccDownloadFinished
 953          *              The DCC download finished event
 954          */
 955         @Subscribe
 956         public void dccDownloadFinished(DccDownloadFinished dccDownloadFinished) {
 957
 958                 /* locate the correct download. */
 959                 Collection<Download> requestedDownload = FluentIterable.from(downloads.get(dccDownloadFinished.dccReceiver().filename())).filter(FILTER_RUNNING).toSet();
 960                 if (requestedDownload.isEmpty()) {
 961                         /* this seems wrong. */
 962                         logger.warn("Download finished but could not be located.");
 963                         return;
 964                 }
 965                 Download download = requestedDownload.iterator().next();
 966
 967                 try {
 968                         download.outputStream().close();
 969                         File file = new File(download.filename());
 970                         file.renameTo(new File(finalDirectory, download.pack().name()));
 971                         eventBus.post(new DownloadFinished(download));
 972                         dccReceivers.remove(dccDownloadFinished.dccReceiver());
 973                         downloads.removeAll(download.pack().name());
 974                 } catch (IOException ioe1) {
 975                         /* TODO - handle all the errors. */
 976                         logger.warn(String.format("Could not move file %s to directory %s.", download.filename(), finalDirectory), ioe1);
 977                 }
 978         }
 979
 980         /**
 981          * Closes the output stream and notifies all listeners of the failure.
 982          *
 983          * @param dccDownloadFailed
 984          *              The DCC download failed event
 985          */
 986         @Subscribe
 987         public void dccDownloadFailed(DccDownloadFailed dccDownloadFailed) {
 988
 989                 /* locate the correct download. */
 990                 Collection<Download> requestedDownload = FluentIterable.from(downloads.get(dccDownloadFailed.dccReceiver().filename())).filter(FILTER_RUNNING).toSet();
 991                 if (requestedDownload.isEmpty()) {
 992                         /* this seems wrong. */
 993                         logger.warn("Download finished but could not be located.");
 994                         return;
 995                 }
 996                 Download download = requestedDownload.iterator().next();
 997
 998                 try {
 999                         Closeables.close(download.outputStream(), true);
1000                         eventBus.post(new DownloadFailed(download));
1001                         dccReceivers.remove(dccDownloadFailed.dccReceiver());
1002                         downloads.removeAll(download.pack().name());
1003                 } catch (IOException ioe1) {
1004                         /* swallow silently. */
1005                 }
1006         }
1007
1008         @Subscribe
1009         public void replyReceived(ReplyReceived replyReceived) {
1010                 logger.trace(String.format("%s: %s", replyReceived.connection().hostname(), replyReceived.reply()));
1011         }
1012
1013         //
1014         // PRIVATE METHODS
1015         //
1016
1017         /**
1018          * Returns the download of the given pack from the given bot.
1019          *
1020          * @param pack
1021          *              The pack being downloaded
1022          * @param bot
1023          *              The bot the pack is being downloaded from
1024          * @return The download, or {@link Optional#absent()} if the download could not
1025          *         be found
1026          */
1027         private Optional<Download> getDownload(Pack pack, Bot bot) {
1028                 if (!downloads.containsKey(pack.name())) {
1029                         return Optional.absent();
1030                 }
1031                 for (Download download : Lists.newArrayList(downloads.get(pack.name()))) {
1032                         if (download.bot().equals(bot)) {
1033                                 return Optional.of(download);
1034                         }
1035                 }
1036                 return Optional.absent();
1037         }
1038
1039         /**
1040          * Searches all current connections for the given connection, returning the
1041          * associated network.
1042          *
1043          * @param connection
1044          *              The connection to get the network for
1045          * @return The network belonging to the connection, or {@link
1046          *         Optional#absent()}
1047          */
1048         private Optional<Network> getNetwork(Connection connection) {
1049                 for (Entry<Network, Connection> networkConnectionEntry : networkConnections.entrySet()) {
1050                         if (networkConnectionEntry.getValue().equals(connection)) {
1051                                 return Optional.of(networkConnectionEntry.getKey());
1052                         }
1053                 }
1054                 return Optional.absent();
1055         }
1056
1057         /**
1058          * Returns the configured channel for the given network and name.
1059          *
1060          * @param network
1061          *              The network the channel is located on
1062          * @param channelName
1063          *              The name of the channel
1064          * @return The configured channel, or {@link Optional#absent()} if no
1065          *         configured channel matching the given network and name was found
1066          */
1067         public Optional<Channel> getChannel(Network network, String channelName) {
1068                 for (Channel channel : channels) {
1069                         if (channel.network().equals(network) && (channel.name().equalsIgnoreCase(channelName))) {
1070                                 return Optional.of(channel);
1071                         }
1072                 }
1073                 return Optional.absent();
1074         }
1075
1076         /**
1077          * Returns the extra channel for the given network and name.
1078          *
1079          * @param network
1080          *              The network the channel is located on
1081          * @param channelName
1082          *              The name of the channel
1083          * @return The extra channel, or {@link Optional#absent()} if no extra channel
1084          *         matching the given network and name was found
1085          */
1086         public Optional<Channel> getExtraChannel(Network network, String channelName) {
1087                 for (Channel channel : extraChannels) {
1088                         if (channel.network().equals(network) && (channel.name().equalsIgnoreCase(channelName))) {
1089                                 return Optional.of(channel);
1090                         }
1091                 }
1092                 return Optional.absent();
1093         }
1094
1095         /**
1096          * Parses {@link Pack} information from the given message.
1097          *
1098          * @param message
1099          *              The message to parse pack information from
1100          * @return The parsed pack, or {@link Optional#absent()} if the message could
1101          *         not be parsed into a pack
1102          */
1103         private Optional<Pack> parsePack(String message) {
1104                 int squareOpen = message.indexOf('[');
1105                 int squareClose = message.indexOf(']', squareOpen);
1106                 if ((squareOpen == -1) && (squareClose == -1)) {
1107                         return Optional.absent();
1108                 }
1109                 String packSize = message.substring(squareOpen + 1, squareClose);
1110                 String packName = message.substring(message.lastIndexOf(' ') + 1);
1111                 String packIndex = message.substring(0, message.indexOf(' ')).substring(1);
1112                 return Optional.of(new Pack(packIndex, packSize, packName));
1113         }
1114
1115 }