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