src/main/java/net/pterodactylus/irc/Connection.java

   1 /*
   2  * XdccDownloader - Connection.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.irc;
  19
  20 import static com.google.common.base.Preconditions.checkState;
  21 import static java.util.Arrays.asList;
  22 import static java.util.concurrent.TimeUnit.SECONDS;
  23
  24 import java.io.BufferedReader;
  25 import java.io.Closeable;
  26 import java.io.EOFException;
  27 import java.io.IOException;
  28 import java.io.InputStream;
  29 import java.io.InputStreamReader;
  30 import java.io.OutputStream;
  31 import java.io.UnsupportedEncodingException;
  32 import java.net.InetAddress;
  33 import java.net.Socket;
  34 import java.net.UnknownHostException;
  35 import java.util.ArrayList;
  36 import java.util.List;
  37 import java.util.Set;
  38 import java.util.concurrent.TimeUnit;
  39 import java.util.concurrent.atomic.AtomicBoolean;
  40
  41 import javax.net.SocketFactory;
  42
  43 import net.pterodactylus.irc.connection.ChannelNotJoinedHandler;
  44 import net.pterodactylus.irc.connection.ConnectionEstablishHandler;
  45 import net.pterodactylus.irc.connection.Handler;
  46 import net.pterodactylus.irc.connection.MotdHandler;
  47 import net.pterodactylus.irc.connection.PrefixHandler;
  48 import net.pterodactylus.irc.event.ChannelJoined;
  49 import net.pterodactylus.irc.event.ChannelLeft;
  50 import net.pterodactylus.irc.event.ChannelMessageReceived;
  51 import net.pterodactylus.irc.event.ChannelNicknames;
  52 import net.pterodactylus.irc.event.ChannelNoticeReceived;
  53 import net.pterodactylus.irc.event.ChannelTopic;
  54 import net.pterodactylus.irc.event.ClientQuit;
  55 import net.pterodactylus.irc.event.ConnectionClosed;
  56 import net.pterodactylus.irc.event.ConnectionEstablished;
  57 import net.pterodactylus.irc.event.ConnectionFailed;
  58 import net.pterodactylus.irc.event.DccAcceptReceived;
  59 import net.pterodactylus.irc.event.DccSendReceived;
  60 import net.pterodactylus.irc.event.KickedFromChannel;
  61 import net.pterodactylus.irc.event.NicknameChanged;
  62 import net.pterodactylus.irc.event.NicknameInUseReceived;
  63 import net.pterodactylus.irc.event.NoNicknameGivenReceived;
  64 import net.pterodactylus.irc.event.PrivateMessageReceived;
  65 import net.pterodactylus.irc.event.PrivateNoticeReceived;
  66 import net.pterodactylus.irc.event.ReplyReceived;
  67 import net.pterodactylus.irc.event.UnknownReplyReceived;
  68 import net.pterodactylus.irc.util.RandomNickname;
  69 import net.pterodactylus.xdcc.util.io.BandwidthCountingInputStream;
  70 import net.pterodactylus.xdcc.util.io.BandwidthCountingOutputStream;
  71
  72 import com.google.common.base.Optional;
  73 import com.google.common.collect.Sets;
  74 import com.google.common.eventbus.EventBus;
  75 import com.google.common.eventbus.Subscribe;
  76 import com.google.common.io.Closeables;
  77 import com.google.common.primitives.Ints;
  78 import com.google.common.primitives.Longs;
  79 import com.google.common.util.concurrent.AbstractExecutionThreadService;
  80 import com.google.common.util.concurrent.Service;
  81 import org.apache.log4j.Logger;
  82
  83 /**
  84  * A connection to an IRC server.
  85  *
  86  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  87  */
  88 public class Connection extends AbstractExecutionThreadService implements Service {
  89
  90         /* The logger. */
  91         private static final Logger logger = Logger.getLogger(Connection.class.getName());
  92
  93         /** The event bus. */
  94         private final EventBus eventBus;
  95
  96         /** The socket factory. */
  97         private final SocketFactory socketFactory;
  98
  99         /** The hostname to connect to. */
 100         private final String hostname;
 101
 102         /** The port to connect to. */
 103         private final int port;
 104
 105         /** The nickname chooser. */
 106         private NicknameChooser nicknameChooser = new NicknameChooser() {
 107
 108                 @Override
 109                 public String getNickname() {
 110                         return RandomNickname.get();
 111                 }
 112         };
 113
 114         /** The nickname. */
 115         private String nickname = null;
 116
 117         /** The username. */
 118         private Optional<String> username = Optional.absent();
 119
 120         /** The real name. */
 121         private Optional<String> realName = Optional.absent();
 122
 123         /** The optional password for the connection. */
 124         private Optional<String> password = Optional.absent();
 125
 126         /** The connection handler. */
 127         private ConnectionHandler connectionHandler;
 128
 129         /** Whether the connection has already been established. */
 130         private final AtomicBoolean established = new AtomicBoolean();
 131
 132         /**
 133          * Creates a new connection.
 134          *
 135          * @param eventBus
 136          *              The event bus
 137          * @param socketFactory
 138          *              The socket factory
 139          * @param hostname
 140          *              The hostname of the IRC server
 141          * @param port
 142          *              The port number of the IRC server
 143          */
 144         public Connection(EventBus eventBus, SocketFactory socketFactory, String hostname, int port) {
 145                 this.eventBus = eventBus;
 146                 this.socketFactory = socketFactory;
 147                 this.hostname = hostname;
 148                 this.port = port;
 149         }
 150
 151         //
 152         // ACCESSORS
 153         //
 154
 155         /**
 156          * Returns the hostname of the remote end of the connection.
 157          *
 158          * @return The remote’s hostname
 159          */
 160         public String hostname() {
 161                 return hostname;
 162         }
 163
 164         /**
 165          * Returns the port number of the remote end of the connection.
 166          *
 167          * @return The remote’s port number
 168          */
 169         public int port() {
 170                 return port;
 171         }
 172
 173         /**
 174          * Returns whether this connection has already been established.
 175          *
 176          * @return {@code true} as long as this connection is established, {@code
 177          *         false} otherwise
 178          */
 179         public boolean established() {
 180                 return established.get();
 181         }
 182
 183         /**
 184          * Returns the nickname that is currently in use by this connection. The
 185          * nickname is only available once the connection has been {@link #start()}ed.
 186          *
 187          * @return The current nickname
 188          */
 189         public String nickname() {
 190                 return nickname;
 191         }
 192
 193         //
 194         // MUTATORS
 195         //
 196
 197         /**
 198          * Sets the nickname chooser. The nickname chooser is only used during the
 199          * creation of the connection.
 200          *
 201          * @param nicknameChooser
 202          *              The nickname chooser
 203          * @return This connection
 204          */
 205         public Connection nicknameChooser(NicknameChooser nicknameChooser) {
 206                 this.nicknameChooser = nicknameChooser;
 207                 return this;
 208         }
 209
 210         /**
 211          * Sets the username to use.
 212          *
 213          * @param username
 214          *              The username to use
 215          * @return This connection
 216          */
 217         public Connection username(String username) {
 218                 this.username = Optional.fromNullable(username);
 219                 return this;
 220         }
 221
 222         /**
 223          * Sets the real name to use.
 224          *
 225          * @param realName
 226          *              The real name to use
 227          * @return This connection
 228          */
 229         public Connection realName(String realName) {
 230                 this.realName = Optional.fromNullable(realName);
 231                 return this;
 232         }
 233
 234         /**
 235          * Sets the optional password for the connection.
 236          *
 237          * @param password
 238          *              The password for the connection
 239          * @return This connection
 240          */
 241         public Connection password(String password) {
 242                 this.password = Optional.fromNullable(password);
 243                 return this;
 244         }
 245
 246         //
 247         // ACTIONS
 248         //
 249
 250         /**
 251          * Returns the current rate of the connection’s incoming side.
 252          *
 253          * @return The current input rate (in bytes per second)
 254          */
 255         public long getInputRate() {
 256                 return (connectionHandler != null) ? connectionHandler.getInputRate() : 0;
 257         }
 258
 259         /**
 260          * Returns the current rate of the connection’s outgoing side.
 261          *
 262          * @return The current output rate (in bytes per second)
 263          */
 264         public long getOutputRate() {
 265                 return (connectionHandler != null) ? connectionHandler.getOutputRate() : 0;
 266         }
 267
 268         /**
 269          * Checks whether the given source is the client represented by this
 270          * connection.
 271          *
 272          * @param source
 273          *              The source to check
 274          * @return {@code true} if this connection represents the given source, {@code
 275          *         false} otherwise
 276          */
 277         public boolean isSource(Source source) {
 278                 return source.nick().isPresent() && source.nick().get().equals(nickname);
 279         }
 280
 281         /**
 282          * Joins the given channel.
 283          *
 284          * @param channel
 285          *              The channel to join
 286          * @throws IOException
 287          *              if an I/O error occurs
 288          */
 289         public void joinChannel(final String channel) throws IOException {
 290                 connectionHandler.sendCommand("JOIN", channel);
 291         }
 292
 293         /**
 294          * Sends a message to the given recipient, which may be a channel or another
 295          * nickname.
 296          *
 297          * @param recipient
 298          *              The recipient of the message
 299          * @param message
 300          *              The message
 301          * @throws IOException
 302          *              if an I/O error occurs
 303          */
 304         public void sendMessage(String recipient, String message) throws IOException {
 305                 connectionHandler.sendCommand("PRIVMSG", recipient, message);
 306         }
 307
 308         /**
 309          * Sends a DCC RESUME request to the given recipient.
 310          *
 311          * @param recipient
 312          *              The recipient of the request
 313          * @param filename
 314          *              The name of the file to resume
 315          * @param port
 316          *              The port number from the original DCC SEND request
 317          * @param position
 318          *              The position at which to resume the transfer
 319          * @throws IOException
 320          *              if an I/O error occurs
 321          */
 322         public void sendDccResume(String recipient, String filename, int port, long position) throws IOException {
 323                 connectionHandler.sendCommand("PRIVMSG", recipient, String.format("\u0001DCC RESUME %s %d %d\u0001", filename, port, position));
 324         }
 325
 326         /**
 327          * Closes this connection.
 328          *
 329          * @throws IOException
 330          *              if an I/O error occurs
 331          */
 332         public void close() throws IOException {
 333                 if (connectionHandler != null) {
 334                         connectionHandler.close();
 335                 }
 336         }
 337
 338         //
 339         // ABSTRACTEXECUTIONTHREADSERVICE METHODS
 340         //
 341
 342         @Override
 343         protected void startUp() throws IllegalStateException {
 344                 checkState(username.isPresent(), "username must be set");
 345                 checkState(realName.isPresent(), "realName must be set");
 346         }
 347
 348         @Override
 349         protected void run() {
 350
 351                 /* connect to remote socket. */
 352                 try {
 353                         Socket socket = socketFactory.createSocket(hostname, port);
 354                         socket.setSoTimeout((int) TimeUnit.MINUTES.toMillis(3));
 355                         connectionHandler = new ConnectionHandler(socket.getInputStream(), socket.getOutputStream());
 356
 357                         /* register connection. */
 358                         if (password.isPresent()) {
 359                                 connectionHandler.sendCommand("PASSWORD", password.get());
 360                         }
 361                         connectionHandler.sendCommand("USER", username.get(), "8", "*", realName.get());
 362                         nickname = nicknameChooser.getNickname();
 363                         connectionHandler.sendCommand("NICK", nickname);
 364
 365                 } catch (IOException ioe1) {
 366                         eventBus.post(new ConnectionFailed(this, ioe1));
 367                         return;
 368                 }
 369
 370                 eventBus.register(this);
 371                 /* now read replies and react. */
 372                 try {
 373                         /* some status variables. */
 374                         boolean connected = true;
 375                         Set<Nickname> nicks = Sets.newHashSet();
 376
 377                         PrefixHandler prefixHandler = new PrefixHandler();
 378                         List<Handler> handlers = asList(
 379                                         new MotdHandler(eventBus, this),
 380                                         new ChannelNotJoinedHandler(eventBus, this),
 381                                         new ConnectionEstablishHandler(eventBus, this),
 382                                         prefixHandler
 383                         );
 384
 385                         while (connected) {
 386                                 Reply reply = connectionHandler.readReply();
 387                                 eventBus.post(new ReplyReceived(this, reply));
 388                                 logger.trace(String.format("<< %s", reply));
 389                                 String command = reply.command();
 390                                 List<String> parameters = reply.parameters();
 391
 392                                 for (Handler handler : handlers) {
 393                                         if (handler.willHandle(reply)) {
 394                                                 handler.handleReply(reply);
 395                                                 break;
 396                                         }
 397                                 }
 398
 399                                 /* most common events. */
 400                                 if (command.equalsIgnoreCase("PRIVMSG")) {
 401                                         String recipient = parameters.get(0);
 402                                         String message = parameters.get(1);
 403                                         if (message.startsWith("\u0001") && message.endsWith("\u0001")) {
 404                                                 /* CTCP! */
 405                                                 handleCtcp(reply.source().get(), message);
 406                                         } else if (!prefixHandler.isChannel(recipient)) {
 407                                                 eventBus.post(new PrivateMessageReceived(this, reply.source().get(), message));
 408                                         } else {
 409                                                 eventBus.post(new ChannelMessageReceived(this, recipient, reply.source().get(), message));
 410                                         }
 411
 412                                 } else if (command.equalsIgnoreCase("NOTICE")) {
 413                                         String recipient = parameters.get(0);
 414                                         String message = parameters.get(1);
 415                                         if (message.startsWith("\u0001") && message.endsWith("\u0001")) {
 416                                                 /* CTCP! */
 417                                                 handleCtcp(reply.source().get(), message);
 418                                         } else if (!prefixHandler.isChannel(recipient)) {
 419                                                 eventBus.post(new PrivateNoticeReceived(this, reply.source().get(), message));
 420                                         } else {
 421                                                 eventBus.post(new ChannelNoticeReceived(this, reply.source().get(), recipient, message));
 422                                         }
 423
 424                                 /* 43x replies are for nick change errors. */
 425                                 } else if (command.equals("431")) {
 426                                         eventBus.post(new NoNicknameGivenReceived(this, reply));
 427                                 } else if (command.equals("433")) {
 428                                         if (!established.get()) {
 429                                                 nickname = nicknameChooser.getNickname();
 430                                                 connectionHandler.sendCommand("NICK", nickname);
 431                                         } else {
 432                                                 eventBus.post(new NicknameInUseReceived(this, reply));
 433                                         }
 434
 435                                 /* client stuff. */
 436                                 } else if (command.equalsIgnoreCase("NICK")) {
 437                                         eventBus.post(new NicknameChanged(this, reply.source().get(), parameters.get(0)));
 438
 439                                 /* channel stuff. */
 440                                 } else if (command.equalsIgnoreCase("JOIN")) {
 441                                         eventBus.post(new ChannelJoined(this, parameters.get(0), reply.source().get()));
 442                                 } else if (command.equals("331")) {
 443                                         /* no topic is set. */
 444                                 } else if (command.equals("332")) {
 445                                         eventBus.post(new ChannelTopic(this, parameters.get(1), parameters.get(2)));
 446                                 } else if (command.equals("353")) {
 447                                         for (String nickname : parameters.get(3).split(" ")) {
 448                                                 if (prefixHandler.isNickPrefixed(nickname)) {
 449                                                         nicks.add(new Nickname(nickname.substring(1), nickname.substring(0, 1)));
 450                                                 } else {
 451                                                         nicks.add(new Nickname(nickname, ""));
 452                                                 }
 453                                         }
 454                                 } else if (command.equals("366")) {
 455                                         eventBus.post(new ChannelNicknames(this, parameters.get(1), nicks));
 456                                         nicks.clear();
 457                                 } else if (command.equalsIgnoreCase("PART")) {
 458                                         eventBus.post(new ChannelLeft(this, parameters.get(0), reply.source().get(), getOptional(parameters, 1)));
 459                                 } else if (command.equalsIgnoreCase("QUIT")) {
 460                                         eventBus.post(new ClientQuit(this, reply.source().get(), parameters.get(0)));
 461
 462                                 /* basic connection housekeeping. */
 463                                 } else if (command.equalsIgnoreCase("PING")) {
 464                                         connectionHandler.sendCommand("PONG", getOptional(parameters, 0), getOptional(parameters, 1));
 465
 466                                 } else if (command.equalsIgnoreCase("KICK")) {
 467                                         eventBus.post(new KickedFromChannel(this, parameters.get(0), reply.source().get(), parameters.get(1), getOptional(parameters, 2)));
 468
 469                                 /* okay, everything else. */
 470                                 } else {
 471                                         eventBus.post(new UnknownReplyReceived(this, reply));
 472                                 }
 473                         }
 474                         eventBus.post(new ConnectionClosed(this));
 475                 } catch (IOException ioe1) {
 476                         logger.warn("I/O error", ioe1);
 477                         eventBus.post(new ConnectionClosed(this, ioe1));
 478                 } catch (RuntimeException re1) {
 479                         logger.error("Runtime error", re1);
 480                         eventBus.post(new ConnectionClosed(this, re1));
 481                 } finally {
 482                         established.set(false);
 483                         eventBus.unregister(this);
 484                         logger.info("Closing Connection.");
 485                         try {
 486                                 Closeables.close(connectionHandler, true);
 487                         } catch (IOException ioe1) {
 488                                 /* will not be thrown. */
 489                         }
 490                 }
 491
 492         }
 493
 494         @Subscribe
 495         public void connectionEstablished(ConnectionEstablished connectionEstablished) {
 496                 if (connectionEstablished.connection() == this) {
 497                         established.set(true);
 498                 }
 499         }
 500
 501         //
 502         // PRIVATE METHODS
 503         //
 504
 505         /**
 506          * Handles a CTCP message.
 507          *
 508          * @param client
 509          *              The client sending the message
 510          * @param message
 511          *              The message
 512          */
 513         private void handleCtcp(Source client, String message) {
 514                 String[] messageWords = message.substring(1, message.length() - 1).split(" +");
 515                 String ctcpCommand = messageWords[0];
 516                 if (ctcpCommand.equalsIgnoreCase("DCC")) {
 517                         if (messageWords[1].equalsIgnoreCase("SEND")) {
 518                                 Optional<InetAddress> inetAddress = parseInetAddress(messageWords[3]);
 519                                 Optional<Integer> port = Optional.fromNullable(Ints.tryParse(messageWords[4]));
 520                                 long fileSize = Optional.fromNullable(Longs.tryParse(messageWords[5])).or(-1L);
 521                                 if (inetAddress.isPresent() && port.isPresent()) {
 522                                         eventBus.post(new DccSendReceived(this, client, messageWords[2], inetAddress.get(), port.get(), fileSize));
 523                                 } else {
 524                                         logger.warn(String.format("Received malformed DCC SEND: “%s”", message));
 525                                 }
 526                         } else if (messageWords[1].equalsIgnoreCase("ACCEPT")) {
 527                                 Optional<Integer> port = Optional.fromNullable(Ints.tryParse(messageWords[3]));
 528                                 long position = (messageWords.length > 4) ? Optional.fromNullable(Longs.tryParse(messageWords[4])).or(-1L) : -1;
 529                                 if (port.isPresent()) {
 530                                         eventBus.post(new DccAcceptReceived(this, client, messageWords[2], port.get(), position));
 531                                 } else {
 532                                         logger.warn(String.format("Received malformed DCC ACCEPT: “%s”", message));
 533                                 }
 534                         }
 535                 }
 536         }
 537
 538         /**
 539          * Returns an item from the list, or {@link Optional#absent()} if the list is
 540          * shorter than required for the given index.
 541          *
 542          * @param list
 543          *              The list to get an item from
 544          * @param index
 545          *              The index of the item
 546          * @param <T>
 547          *              The type of the list items
 548          * @return This list item wrapped in an {@link Optional}, or {@link
 549          *         Optional#absent()} if the list is not long enough
 550          */
 551         private static <T> Optional<T> getOptional(List<T> list, int index) {
 552                 if (index < list.size()) {
 553                         return Optional.fromNullable(list.get(index));
 554                 }
 555                 return Optional.absent();
 556         }
 557
 558         /**
 559          * Parses the given {@code ip} and returns an {@link InetAddress} from it.
 560          *
 561          * @param ip
 562          *              The IP to parse
 563          * @return The parsed inet address, or {@link Optional#absent()} if no inet
 564          *         address could be parsed
 565          */
 566         private Optional<InetAddress> parseInetAddress(String ip) {
 567                 Long ipNumber = Longs.tryParse(ip);
 568                 if (ipNumber == null) {
 569                         return Optional.absent();
 570                 }
 571
 572                 StringBuilder hostname = new StringBuilder(15);
 573                 hostname.append((ipNumber >>> 24) & 0xff).append('.');
 574                 hostname.append((ipNumber >>> 16) & 0xff).append('.');
 575                 hostname.append((ipNumber >>> 8) & 0xff).append('.');
 576                 hostname.append(ipNumber & 0xff);
 577                 try {
 578                         return Optional.of(InetAddress.getByName(hostname.toString()));
 579                 } catch (UnknownHostException uhe1) {
 580                         return Optional.absent();
 581                 }
 582         }
 583
 584         /** Handles input and output for the connection. */
 585         private class ConnectionHandler implements Closeable {
 586
 587                 /** The output stream of the connection. */
 588                 private final BandwidthCountingOutputStream outputStream;
 589
 590                 /** The input stream. */
 591                 private final BandwidthCountingInputStream inputStream;
 592
 593                 /** The input stream of the connection. */
 594                 private final BufferedReader inputStreamReader;
 595
 596                 /**
 597                  * Creates a new connection handler for the given input stream and output
 598                  * stream.
 599                  *
 600                  * @param inputStream
 601                  *              The input stream of the connection
 602                  * @param outputStream
 603                  *              The output stream of the connection
 604                  * @throws UnsupportedEncodingException
 605                  *              if the encoding (currently “UTF-8”) is not valid
 606                  */
 607                 private ConnectionHandler(InputStream inputStream, OutputStream outputStream) throws UnsupportedEncodingException {
 608                         this.outputStream = new BandwidthCountingOutputStream(outputStream, 5, SECONDS);
 609                         this.inputStream = new BandwidthCountingInputStream(inputStream, 5, SECONDS);
 610                         inputStreamReader = new BufferedReader(new InputStreamReader(this.inputStream, "UTF-8"));
 611                 }
 612
 613                 //
 614                 // ACTIONS
 615                 //
 616
 617                 /**
 618                  * Returns the current rate of the connection’s incoming side.
 619                  *
 620                  * @return The current input rate (in bytes per second)
 621                  */
 622                 public long getInputRate() {
 623                         return inputStream.getCurrentRate();
 624                 }
 625
 626                 /**
 627                  * Returns the current rate of the connection’s outgoing side.
 628                  *
 629                  * @return The current output rate (in bytes per second)
 630                  */
 631                 public long getOutputRate() {
 632                         return outputStream.getCurrentRate();
 633                 }
 634
 635                 /**
 636                  * Sends a command with the given parameters, skipping all {@link
 637                  * Optional#absent()} optionals.
 638                  *
 639                  * @param command
 640                  *              The command to send
 641                  * @param parameters
 642                  *              The parameters
 643                  * @throws IOException
 644                  *              if an I/O error occurs
 645                  */
 646                 public void sendCommand(String command, Optional<String>... parameters) throws IOException {
 647                         List<String> setParameters = new ArrayList<String>();
 648                         for (Optional<String> maybeSetParameter : parameters) {
 649                                 if (maybeSetParameter.isPresent()) {
 650                                         setParameters.add(maybeSetParameter.get());
 651                                 }
 652                         }
 653                         sendCommand(command, setParameters.toArray(new String[setParameters.size()]));
 654                 }
 655
 656                 /**
 657                  * Sends a command with the given parameters.
 658                  *
 659                  * @param command
 660                  *              The command to send
 661                  * @param parameters
 662                  *              The parameters of the command
 663                  * @throws IOException
 664                  *              if an I/O error occurs
 665                  * @throws IllegalArgumentException
 666                  *              if any parameter but that last contains a space character
 667                  */
 668                 public void sendCommand(String command, String... parameters) throws IOException, IllegalArgumentException {
 669                         StringBuilder commandBuilder = new StringBuilder();
 670
 671                         commandBuilder.append(command);
 672                         for (int parameterIndex = 0; parameterIndex < parameters.length; ++parameterIndex) {
 673                                 String parameter = parameters[parameterIndex];
 674                                 /* space is only allowed in the last parameter. */
 675                                 commandBuilder.append(' ');
 676                                 if (parameter.contains(" ")) {
 677                                         if (parameterIndex == (parameters.length - 1)) {
 678                                                 commandBuilder.append(':');
 679                                         } else {
 680                                                 throw new IllegalArgumentException(String.format("parameter “%s” must not contain space!", parameter));
 681                                         }
 682                                 }
 683                                 commandBuilder.append(parameter);
 684                         }
 685
 686                         logger.trace(String.format(">> %s", commandBuilder));
 687                         outputStream.write((commandBuilder.toString() + "\r\n").getBytes("UTF-8"));
 688                         outputStream.flush();
 689                 }
 690
 691                 /**
 692                  * Reads a line of reply from the connection.
 693                  *
 694                  * @return The reply
 695                  * @throws IOException
 696                  *              if an I/O error occurs
 697                  * @throws EOFException
 698                  *              if EOF was reached
 699                  */
 700                 public Reply readReply() throws IOException, EOFException {
 701                         String line = inputStreamReader.readLine();
 702                         if (line == null) {
 703                                 throw new EOFException();
 704                         }
 705
 706                         return Reply.parseLine(line);
 707                 }
 708
 709                 //
 710                 // CLOSEABLE METHODS
 711                 //
 712
 713                 @Override
 714                 public void close() throws IOException {
 715                         Closeables.close(outputStream, true);
 716                         Closeables.close(inputStreamReader, true);
 717                         Closeables.close(inputStream, true);
 718                 }
 719
 720         }
 721
 722 }