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