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
  22 import java.io.BufferedReader;
  23 import java.io.Closeable;
  24 import java.io.EOFException;
  25 import java.io.IOException;
  26 import java.io.InputStream;
  27 import java.io.InputStreamReader;
  28 import java.io.OutputStream;
  29 import java.io.UnsupportedEncodingException;
  30 import java.net.InetAddress;
  31 import java.net.Socket;
  32 import java.net.UnknownHostException;
  33 import java.util.ArrayList;
  34 import java.util.List;
  35 import java.util.Map;
  36 import java.util.Set;
  37 import java.util.logging.Level;
  38 import java.util.logging.Logger;
  39 import javax.net.SocketFactory;
  40
  41 import net.pterodactylus.irc.event.ChannelJoined;
  42 import net.pterodactylus.irc.event.ChannelLeft;
  43 import net.pterodactylus.irc.event.ChannelMessageReceived;
  44 import net.pterodactylus.irc.event.ChannelNicknames;
  45 import net.pterodactylus.irc.event.ChannelNotJoined;
  46 import net.pterodactylus.irc.event.ChannelNotJoined.Reason;
  47 import net.pterodactylus.irc.event.ChannelNoticeReceived;
  48 import net.pterodactylus.irc.event.ChannelTopic;
  49 import net.pterodactylus.irc.event.ClientQuit;
  50 import net.pterodactylus.irc.event.ConnectionClosed;
  51 import net.pterodactylus.irc.event.ConnectionEstablished;
  52 import net.pterodactylus.irc.event.ConnectionFailed;
  53 import net.pterodactylus.irc.event.DccAcceptReceived;
  54 import net.pterodactylus.irc.event.DccSendReceived;
  55 import net.pterodactylus.irc.event.MotdReceived;
  56 import net.pterodactylus.irc.event.NicknameChanged;
  57 import net.pterodactylus.irc.event.NicknameInUseReceived;
  58 import net.pterodactylus.irc.event.NoNicknameGivenReceived;
  59 import net.pterodactylus.irc.event.PrivateMessageReceived;
  60 import net.pterodactylus.irc.event.PrivateNoticeReceived;
  61 import net.pterodactylus.irc.event.UnknownReplyReceived;
  62 import net.pterodactylus.irc.util.RandomNickname;
  63
  64 import com.google.common.base.Optional;
  65 import com.google.common.collect.Maps;
  66 import com.google.common.collect.Sets;
  67 import com.google.common.eventbus.EventBus;
  68 import com.google.common.io.Closeables;
  69 import com.google.common.primitives.Ints;
  70 import com.google.common.primitives.Longs;
  71 import com.google.common.util.concurrent.AbstractExecutionThreadService;
  72 import com.google.common.util.concurrent.Service;
  73
  74 /**
  75  * A connection to an IRC server.
  76  *
  77  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  78  */
  79 public class Connection extends AbstractExecutionThreadService implements Service {
  80
  81         /* The logger. */
  82         private static final Logger logger = Logger.getLogger(Connection.class.getName());
  83
  84         /** The event bus. */
  85         private final EventBus eventBus;
  86
  87         /** The socket factory. */
  88         private final SocketFactory socketFactory;
  89
  90         /** The hostname to connect to. */
  91         private final String hostname;
  92
  93         /** The port to connect to. */
  94         private final int port;
  95
  96         /** The nickname chooser. */
  97         private NicknameChooser nicknameChooser = new NicknameChooser() {
  98
  99                 @Override
 100                 public String getNickname() {
 101                         return RandomNickname.get();
 102                 }
 103         };
 104
 105         /** The nickname. */
 106         private String nickname = null;
 107
 108         /** The username. */
 109         private Optional<String> username = Optional.absent();
 110
 111         /** The real name. */
 112         private Optional<String> realName = Optional.absent();
 113
 114         /** The optional password for the connection. */
 115         private Optional<String> password = Optional.absent();
 116
 117         /** The connection handler. */
 118         private ConnectionHandler connectionHandler;
 119
 120         /** Whether the connection has already been established. */
 121         private boolean established;
 122
 123         /**
 124          * Creates a new connection.
 125          *
 126          * @param eventBus
 127          *              The event bus
 128          * @param socketFactory
 129          *              The socket factory
 130          * @param hostname
 131          *              The hostname of the IRC server
 132          * @param port
 133          *              The port number of the IRC server
 134          */
 135         public Connection(EventBus eventBus, SocketFactory socketFactory, String hostname, int port) {
 136                 this.eventBus = eventBus;
 137                 this.socketFactory = socketFactory;
 138                 this.hostname = hostname;
 139                 this.port = port;
 140         }
 141
 142         //
 143         // ACCESSORS
 144         //
 145
 146         /**
 147          * Returns the hostname of the remote end of the connection.
 148          * @return The remote’s hostname
 149          */
 150         public String hostname() {
 151                 return hostname;
 152         }
 153
 154         /**
 155          * Returns the port number of the remote end of the connection.
 156          * @return The remote’s port number
 157          */
 158         public int port() {
 159                 return port;
 160         }
 161
 162         /**
 163          * Returns whether this connection has already been established.
 164          *
 165          * @return {@code true} as long as this connection is established, {@code
 166          *         false} otherwise
 167          */
 168         public boolean established() {
 169                 return established;
 170         }
 171
 172         /**
 173          * Returns the nickname that is currently in use by this connection. The
 174          * nickname is only available once the connection has been {@link #start()}ed.
 175          *
 176          * @return The current nickname
 177          */
 178         public String nickname() {
 179                 return nickname;
 180         }
 181
 182         //
 183         // MUTATORS
 184         //
 185
 186         /**
 187          * Sets the nickname chooser. The nickname chooser is only used during the
 188          * creation of the connection.
 189          *
 190          * @param nicknameChooser
 191          *              The nickname chooser
 192          * @return This connection
 193          */
 194         public Connection nicknameChooser(NicknameChooser nicknameChooser) {
 195                 this.nicknameChooser = nicknameChooser;
 196                 return this;
 197         }
 198
 199         /**
 200          * Sets the username to use.
 201          *
 202          * @param username
 203          *              The username to use
 204          * @return This connection
 205          */
 206         public Connection username(String username) {
 207                 this.username = Optional.fromNullable(username);
 208                 return this;
 209         }
 210
 211         /**
 212          * Sets the real name to use.
 213          *
 214          * @param realName
 215          *              The real name to use
 216          * @return This connection
 217          */
 218         public Connection realName(String realName) {
 219                 this.realName = Optional.fromNullable(realName);
 220                 return this;
 221         }
 222
 223         /**
 224          * Sets the optional password for the connection.
 225          *
 226          * @param password
 227          *              The password for the connection
 228          * @return This connection
 229          */
 230         public Connection password(String password) {
 231                 this.password = Optional.fromNullable(password);
 232                 return this;
 233         }
 234
 235         //
 236         // ACTIONS
 237         //
 238
 239         /**
 240          * Checks whether the given source is the client represented by this
 241          * connection.
 242          *
 243          * @param source
 244          *              The source to check
 245          * @return {@code true} if this connection represents the given source, {@code
 246          *         false} otherwise
 247          */
 248         public boolean isSource(Source source) {
 249                 return source.nick().isPresent() && source.nick().get().equals(nickname);
 250         }
 251
 252         /**
 253          * Joins the given channel.
 254          *
 255          * @param channel
 256          *              The channel to join
 257          * @throws IOException
 258          *              if an I/O error occurs
 259          */
 260         public void joinChannel(final String channel) throws IOException {
 261                 connectionHandler.sendCommand("JOIN", channel);
 262         }
 263
 264         /**
 265          * Sends a message to the given recipient, which may be a channel or another
 266          * nickname.
 267          *
 268          * @param recipient
 269          *              The recipient of the message
 270          * @param message
 271          *              The message
 272          * @throws IOException
 273          *              if an I/O error occurs
 274          */
 275         public void sendMessage(String recipient, String message) throws IOException {
 276                 connectionHandler.sendCommand("PRIVMSG", recipient, message);
 277         }
 278
 279         /**
 280          * Sends a DCC RESUME request to the given recipient.
 281          *
 282          * @param recipient
 283          *              The recipient of the request
 284          * @param filename
 285          *              The name of the file to resume
 286          * @param port
 287          *              The port number from the original DCC SEND request
 288          * @param position
 289          *              The position at which to resume the transfer
 290          * @throws IOException
 291          *              if an I/O error occurs
 292          */
 293         public void sendDccResume(String recipient, String filename, int port, long position) throws IOException {
 294                 connectionHandler.sendCommand("PRIVMSG", recipient, String.format("\u0001DCC RESUME %s %d %d\u0001", filename, port, position));
 295         }
 296
 297         /**
 298          * Closes this connection.
 299          *
 300          * @throws IOException
 301          *              if an I/O error occurs
 302          */
 303         public void close() throws IOException {
 304                 connectionHandler.close();
 305         }
 306
 307         //
 308         // ABSTRACTEXECUTIONTHREADSERVICE METHODS
 309         //
 310
 311         @Override
 312         protected void startUp() throws IllegalStateException {
 313                 checkState(username.isPresent(), "username must be set");
 314                 checkState(realName.isPresent(), "realName must be set");
 315         }
 316
 317         @Override
 318         protected void run() {
 319
 320                 /* connect to remote socket. */
 321                 try {
 322                         Socket socket = socketFactory.createSocket(hostname, port);
 323                         connectionHandler = new ConnectionHandler(socket.getInputStream(), socket.getOutputStream());
 324
 325                         /* register connection. */
 326                         if (password.isPresent()) {
 327                                 connectionHandler.sendCommand("PASSWORD", password.get());
 328                         }
 329                         connectionHandler.sendCommand("USER", username.get(), "8", "*", realName.get());
 330                         nickname = nicknameChooser.getNickname();
 331                         connectionHandler.sendCommand("NICK", nickname);
 332
 333                 } catch (IOException ioe1) {
 334                         eventBus.post(new ConnectionFailed(this, ioe1));
 335                         return;
 336                 }
 337
 338                 /* now read replies and react. */
 339                 try {
 340                         /* some status variables. */
 341                         int oldConnectionStatus = 0;
 342                         int connectionStatus = 0;
 343                         boolean connected = true;
 344                         StringBuilder motd = new StringBuilder();
 345                         Set<Nickname> nicks = Sets.newHashSet();
 346
 347                         /* server modes. */
 348                         Map<String, String> nickPrefixes = Maps.newHashMap();
 349                         Set<Character> channelTypes = Sets.newHashSet();
 350
 351                         while (connected) {
 352                                 Reply reply = connectionHandler.readReply();
 353                                 logger.finest(String.format("<< %s", reply));
 354                                 String command = reply.command();
 355                                 List<String> parameters = reply.parameters();
 356
 357                                 /* most common events. */
 358                                 if (command.equalsIgnoreCase("PRIVMSG")) {
 359                                         String recipient = parameters.get(0);
 360                                         String message = parameters.get(1);
 361                                         if (message.startsWith("\u0001") && message.endsWith("\u0001")) {
 362                                                 /* CTCP! */
 363                                                 handleCtcp(reply.source().get(), message);
 364                                         } else if (!channelTypes.contains(recipient.charAt(0))) {
 365                                                 eventBus.post(new PrivateMessageReceived(this, reply.source().get(), message));
 366                                         } else {
 367                                                 eventBus.post(new ChannelMessageReceived(this, recipient, reply.source().get(), message));
 368                                         }
 369
 370                                 } else if (command.equalsIgnoreCase("NOTICE")) {
 371                                         String recipient = parameters.get(0);
 372                                         String message = parameters.get(1);
 373                                         if (message.startsWith("\u0001") && message.endsWith("\u0001")) {
 374                                                 /* CTCP! */
 375                                                 handleCtcp(reply.source().get(), message);
 376                                         } else if (!channelTypes.contains(recipient.charAt(0))) {
 377                                                 eventBus.post(new PrivateNoticeReceived(this, reply));
 378                                         } else {
 379                                                 eventBus.post(new ChannelNoticeReceived(this, reply.source().get(), recipient, message));
 380                                         }
 381
 382                                 /* 43x replies are for nick change errors. */
 383                                 } else if (command.equals("431")) {
 384                                         eventBus.post(new NoNicknameGivenReceived(this, reply));
 385                                 } else if (command.equals("433")) {
 386                                         if (connectionStatus == 0) {
 387                                                 nickname = nicknameChooser.getNickname();
 388                                                 connectionHandler.sendCommand("NICK", nickname);
 389                                         } else {
 390                                                 eventBus.post(new NicknameInUseReceived(this, reply));
 391                                         }
 392
 393                                 /* client stuff. */
 394                                 } else if (command.equalsIgnoreCase("NICK")) {
 395                                         eventBus.post(new NicknameChanged(this, reply.source().get(), parameters.get(0)));
 396
 397                                 /* channel stuff. */
 398                                 } else if (command.equalsIgnoreCase("JOIN")) {
 399                                         eventBus.post(new ChannelJoined(this, parameters.get(0), reply.source().get()));
 400                                 } else if (command.equals("331")) {
 401                                         /* no topic is set. */
 402                                 } else if (command.equals("332")) {
 403                                         eventBus.post(new ChannelTopic(this, parameters.get(1), parameters.get(2)));
 404                                 } else if (command.equals("353")) {
 405                                         for (String nickname : parameters.get(3).split(" ")) {
 406                                                 if (nickPrefixes.containsKey(nickname.substring(0, 1))) {
 407                                                         nicks.add(new Nickname(nickname.substring(1), nickname.substring(0, 1)));
 408                                                 } else {
 409                                                         nicks.add(new Nickname(nickname, ""));
 410                                                 }
 411                                         }
 412                                 } else if (command.equals("366")) {
 413                                         eventBus.post(new ChannelNicknames(this, parameters.get(1), nicks));
 414                                         nicks.clear();
 415                                 } else if (command.equalsIgnoreCase("PART")) {
 416                                         eventBus.post(new ChannelLeft(this, parameters.get(0), reply.source().get(), getOptional(parameters, 1)));
 417                                 } else if (command.equalsIgnoreCase("QUIT")) {
 418                                         eventBus.post(new ClientQuit(this, reply.source().get(), parameters.get(0)));
 419
 420                                 /* common channel join errors. */
 421                                 } else if (command.equals("474")) {
 422                                         eventBus.post(new ChannelNotJoined(this, parameters.get(1), Reason.banned));
 423                                 } else if (command.equals("473")) {
 424                                         eventBus.post(new ChannelNotJoined(this, parameters.get(1), Reason.inviteOnly));
 425                                 } else if (command.equals("475")) {
 426                                         eventBus.post(new ChannelNotJoined(this, parameters.get(1), Reason.badChannelKey));
 427
 428                                 /* basic connection housekeeping. */
 429                                 } else if (command.equalsIgnoreCase("PING")) {
 430                                         connectionHandler.sendCommand("PONG", getOptional(parameters, 0), getOptional(parameters, 1));
 431
 432                                 /* replies 001-004 don’t hold information but they have to be sent on a successful connection. */
 433                                 } else if (command.equals("001")) {
 434                                         connectionStatus |= 0x01;
 435                                 } else if (command.equals("002")) {
 436                                         connectionStatus |= 0x02;
 437                                 } else if (command.equals("003")) {
 438                                         connectionStatus |= 0x04;
 439                                 } else if (command.equals("004")) {
 440                                         connectionStatus |= 0x08;
 441
 442                                 /* 005 originally was a bounce message, now used to transmit useful information about the server. */
 443                                 } else if (command.equals("005")) {
 444                                         for (String parameter : parameters) {
 445                                                 if (parameter.startsWith("PREFIX=")) {
 446                                                         int openParen = parameter.indexOf('(');
 447                                                         int closeParen = parameter.indexOf(')');
 448                                                         if ((openParen != -1) && (closeParen != -1)) {
 449                                                                 for (int modeCharacterIndex = 1; modeCharacterIndex < (closeParen - openParen); ++modeCharacterIndex) {
 450                                                                         char modeCharacter = parameter.charAt(openParen + modeCharacterIndex);
 451                                                                         char modeSymbol = parameter.charAt(closeParen + modeCharacterIndex);
 452                                                                         nickPrefixes.put(String.valueOf(modeSymbol), String.valueOf(modeCharacter));
 453                                                                 }
 454                                                                 logger.fine(String.format("Parsed Prefixes: %s", nickPrefixes));
 455                                                         }
 456                                                 } else if (parameter.startsWith("CHANTYPES=")) {
 457                                                         for (int typeIndex = 10; typeIndex < parameter.length(); ++typeIndex) {
 458                                                                 channelTypes.add(parameter.charAt(typeIndex));
 459                                                         }
 460                                                         logger.fine(String.format("Parsed Channel Types: %s", channelTypes));
 461                                                 }
 462                                         }
 463
 464                                 /* 375, 372, and 376 handle the server’s MOTD. */
 465                                 } else if (command.equals("375")) {
 466                                         /* MOTD starts. */
 467                                         motd.append(parameters.get(1)).append('\n');
 468                                 } else if (command.equals("372")) {
 469                                         motd.append(parameters.get(1)).append('\n');
 470                                 } else if (command.equals("376")) {
 471                                         motd.append(parameters.get(1)).append('\n');
 472                                         eventBus.post(new MotdReceived(this, motd.toString()));
 473                                         motd.setLength(0);
 474
 475                                 /* okay, everything else. */
 476                                 } else {
 477                                         eventBus.post(new UnknownReplyReceived(this, reply));
 478                                 }
 479
 480                                 if ((connectionStatus == 0x0f) && (connectionStatus != oldConnectionStatus)) {
 481                                         /* connection succeeded! */
 482                                         established = true;
 483                                         eventBus.post(new ConnectionEstablished(this));
 484                                 }
 485                                 oldConnectionStatus = connectionStatus;
 486                         }
 487                         eventBus.post(new ConnectionClosed(this));
 488                 } catch (IOException ioe1) {
 489                         logger.log(Level.WARNING, "I/O error", ioe1);
 490                         eventBus.post(new ConnectionClosed(this, ioe1));
 491                 } finally {
 492                         established = false;
 493                         logger.info("Closing Connection.");
 494                         try {
 495                                 Closeables.close(connectionHandler, true);
 496                         } catch (IOException ioe1) {
 497                                 /* will not be thrown. */
 498                         }
 499                 }
 500
 501         }
 502
 503         //
 504         // PRIVATE METHODS
 505         //
 506
 507         /**
 508          * Handles a CTCP message.
 509          *
 510          * @param client
 511          *              The client sending the message
 512          * @param message
 513          *              The message
 514          */
 515         private void handleCtcp(Source client, String message) {
 516                 String[] messageWords = message.substring(1, message.length() - 1).split(" +");
 517                 String ctcpCommand = messageWords[0];
 518                 if (ctcpCommand.equalsIgnoreCase("DCC")) {
 519                         if (messageWords[1].equalsIgnoreCase("SEND")) {
 520                                 Optional<InetAddress> inetAddress = parseInetAddress(messageWords[3]);
 521                                 Optional<Integer> port = Optional.fromNullable(Ints.tryParse(messageWords[4]));
 522                                 long fileSize = Optional.fromNullable(Longs.tryParse(messageWords[5])).or(-1L);
 523                                 if (inetAddress.isPresent() && port.isPresent()) {
 524                                         eventBus.post(new DccSendReceived(this, client, messageWords[2], inetAddress.get(), port.get(), fileSize));
 525                                 } else {
 526                                         logger.warning(String.format("Received malformed DCC SEND: “%s”", message));
 527                                 }
 528                         } else if (messageWords[1].equalsIgnoreCase("ACCEPT")) {
 529                                 Optional<Integer> port = Optional.fromNullable(Ints.tryParse(messageWords[3]));
 530                                 long position = Optional.fromNullable(Longs.tryParse(messageWords[4])).or(-1L);
 531                                 if (port.isPresent()) {
 532                                         eventBus.post(new DccAcceptReceived(this, client, messageWords[2], port.get(), position));
 533                                 } else {
 534                                         logger.warning(String.format("Received malformed DCC ACCEPT: “%s”", message));
 535                                 }
 536                         }
 537                 }
 538         }
 539
 540         /**
 541          * Returns an item from the list, or {@link Optional#absent()} if the list is
 542          * shorter than required for the given index.
 543          *
 544          * @param list
 545          *              The list to get an item from
 546          * @param index
 547          *              The index of the item
 548          * @param <T>
 549          *              The type of the list items
 550          * @return This list item wrapped in an {@link Optional}, or {@link
 551          *         Optional#absent()} if the list is not long enough
 552          */
 553         private static <T> Optional<T> getOptional(List<T> list, int index) {
 554                 if (index < list.size()) {
 555                         return Optional.fromNullable(list.get(index));
 556                 }
 557                 return Optional.absent();
 558         }
 559
 560         /**
 561          * Parses the given {@code ip} and returns an {@link InetAddress} from it.
 562          *
 563          * @param ip
 564          *              The IP to parse
 565          * @return The parsed inet address, or {@link Optional#absent()} if no inet
 566          *         address could be parsed
 567          */
 568         private Optional<InetAddress> parseInetAddress(String ip) {
 569                 Long ipNumber = Longs.tryParse(ip);
 570                 if (ipNumber == null) {
 571                         return Optional.absent();
 572                 }
 573
 574                 StringBuilder hostname = new StringBuilder(15);
 575                 hostname.append((ipNumber >>> 24) & 0xff).append('.');
 576                 hostname.append((ipNumber >>> 16) & 0xff).append('.');
 577                 hostname.append((ipNumber >>> 8) & 0xff).append('.');
 578                 hostname.append(ipNumber & 0xff);
 579                 try {
 580                         return Optional.of(InetAddress.getByName(hostname.toString()));
 581                 } catch (UnknownHostException uhe1) {
 582                         return Optional.absent();
 583                 }
 584         }
 585
 586         /** Handles input and output for the connection. */
 587         private class ConnectionHandler implements Closeable {
 588
 589                 /** The output stream of the connection. */
 590                 private final OutputStream outputStream;
 591
 592                 /** The input stream of the connection. */
 593                 private final BufferedReader inputStreamReader;
 594
 595                 /**
 596                  * Creates a new connection handler for the given input stream and output
 597                  * stream.
 598                  *
 599                  * @param inputStream
 600                  *              The input stream of the connection
 601                  * @param outputStream
 602                  *              The output stream of the connection
 603                  * @throws UnsupportedEncodingException
 604                  *              if the encoding (currently “UTF-8”) is not valid
 605                  */
 606                 private ConnectionHandler(InputStream inputStream, OutputStream outputStream) throws UnsupportedEncodingException {
 607                         this.outputStream = outputStream;
 608                         inputStreamReader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"));
 609                 }
 610
 611                 //
 612                 // ACTIONS
 613                 //
 614
 615                 /**
 616                  * Sends a command with the given parameters, skipping all {@link
 617                  * Optional#absent()} optionals.
 618                  *
 619                  * @param command
 620                  *              The command to send
 621                  * @param parameters
 622                  *              The parameters
 623                  * @throws IOException
 624                  *              if an I/O error occurs
 625                  */
 626                 public void sendCommand(String command, Optional<String>... parameters) throws IOException {
 627                         List<String> setParameters = new ArrayList<String>();
 628                         for (Optional<String> maybeSetParameter : parameters) {
 629                                 if (maybeSetParameter.isPresent()) {
 630                                         setParameters.add(maybeSetParameter.get());
 631                                 }
 632                         }
 633                         sendCommand(command, setParameters.toArray(new String[setParameters.size()]));
 634                 }
 635
 636                 /**
 637                  * Sends a command with the given parameters.
 638                  *
 639                  * @param command
 640                  *              The command to send
 641                  * @param parameters
 642                  *              The parameters of the command
 643                  * @throws IOException
 644                  *              if an I/O error occurs
 645                  * @throws IllegalArgumentException
 646                  *              if any parameter but that last contains a space character
 647                  */
 648                 public void sendCommand(String command, String... parameters) throws IOException, IllegalArgumentException {
 649                         StringBuilder commandBuilder = new StringBuilder();
 650
 651                         commandBuilder.append(command);
 652                         for (int parameterIndex = 0; parameterIndex < parameters.length; ++parameterIndex) {
 653                                 String parameter = parameters[parameterIndex];
 654                                 /* space is only allowed in the last parameter. */
 655                                 commandBuilder.append(' ');
 656                                 if (parameter.contains(" ")) {
 657                                         if (parameterIndex == (parameters.length - 1)) {
 658                                                 commandBuilder.append(':');
 659                                         } else {
 660                                                 throw new IllegalArgumentException(String.format("parameter “%s” must not contain space!", parameter));
 661                                         }
 662                                 }
 663                                 commandBuilder.append(parameter);
 664                         }
 665
 666                         logger.finest(String.format(">> %s", commandBuilder));
 667                         outputStream.write((commandBuilder.toString() + "\r\n").getBytes("UTF-8"));
 668                         outputStream.flush();
 669                 }
 670
 671                 /**
 672                  * Reads a line of reply from the connection.
 673                  *
 674                  * @return The reply
 675                  * @throws IOException
 676                  *              if an I/O error occurs
 677                  * @throws EOFException
 678                  *              if EOF was reached
 679                  */
 680                 public Reply readReply() throws IOException, EOFException {
 681                         String line = inputStreamReader.readLine();
 682                         if (line == null) {
 683                                 throw new EOFException();
 684                         }
 685
 686                         return Reply.parseLine(line);
 687                 }
 688
 689                 //
 690                 // CLOSEABLE METHODS
 691                 //
 692
 693                 @Override
 694                 public void close() throws IOException {
 695                         Closeables.close(outputStream, true);
 696                         Closeables.close(inputStreamReader, true);
 697                 }
 698
 699         }
 700
 701 }