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