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