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.Socket;
  31 import java.util.ArrayList;
  32 import java.util.List;
  33 import java.util.Map;
  34 import java.util.Set;
  35 import java.util.logging.Level;
  36 import java.util.logging.Logger;
  37 import javax.net.SocketFactory;
  38
  39 import net.pterodactylus.irc.event.ChannelJoined;
  40 import net.pterodactylus.irc.event.ChannelMessageReceived;
  41 import net.pterodactylus.irc.event.ChannelNicknames;
  42 import net.pterodactylus.irc.event.ChannelNotJoined;
  43 import net.pterodactylus.irc.event.ChannelNotJoined.Reason;
  44 import net.pterodactylus.irc.event.ChannelTopic;
  45 import net.pterodactylus.irc.event.ConnectionEstablished;
  46 import net.pterodactylus.irc.event.ConnectionFailed;
  47 import net.pterodactylus.irc.event.MotdReceived;
  48 import net.pterodactylus.irc.event.NicknameInUseReceived;
  49 import net.pterodactylus.irc.event.NoNicknameGivenReceived;
  50 import net.pterodactylus.irc.event.PrivateMessageReceived;
  51 import net.pterodactylus.irc.event.UnknownReplyReceived;
  52 import net.pterodactylus.irc.util.RandomNickname;
  53
  54 import com.google.common.base.Optional;
  55 import com.google.common.collect.Maps;
  56 import com.google.common.collect.Sets;
  57 import com.google.common.eventbus.EventBus;
  58 import com.google.common.io.Closeables;
  59 import com.google.common.util.concurrent.AbstractExecutionThreadService;
  60 import com.google.common.util.concurrent.Service;
  61
  62 /**
  63  * A connection to an IRC server.
  64  *
  65  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  66  */
  67 public class Connection extends AbstractExecutionThreadService implements Service {
  68
  69         /* The logger. */
  70         private static final Logger logger = Logger.getLogger(Connection.class.getName());
  71
  72         /** The event bus. */
  73         private final EventBus eventBus;
  74
  75         /** The socket factory. */
  76         private final SocketFactory socketFactory;
  77
  78         /** The hostname to connect to. */
  79         private final String hostname;
  80
  81         /** The port to connect to. */
  82         private final int port;
  83
  84         /** The nickname chooser. */
  85         private NicknameChooser nicknameChooser = new NicknameChooser() {
  86
  87                 @Override
  88                 public String getNickname() {
  89                         return RandomNickname.get();
  90                 }
  91         };
  92
  93         /** The nickname. */
  94         private String nickname = null;
  95
  96         /** The username. */
  97         private Optional<String> username = Optional.absent();
  98
  99         /** The real name. */
 100         private Optional<String> realName = Optional.absent();
 101
 102         /** The optional password for the connection. */
 103         private Optional<String> password = Optional.absent();
 104
 105         /** The connection handler. */
 106         private ConnectionHandler connectionHandler;
 107
 108         /**
 109          * Creates a new connection.
 110          *
 111          * @param eventBus
 112          *              The event bus
 113          * @param socketFactory
 114          *              The socket factory
 115          * @param hostname
 116          *              The hostname of the IRC server
 117          * @param port
 118          *              The port number of the IRC server
 119          */
 120         public Connection(EventBus eventBus, SocketFactory socketFactory, String hostname, int port) {
 121                 this.eventBus = eventBus;
 122                 this.socketFactory = socketFactory;
 123                 this.hostname = hostname;
 124                 this.port = port;
 125         }
 126
 127         //
 128         // ACCESSORS
 129         //
 130
 131         /**
 132          * Returns the nickname that is currently in use by this connection. The
 133          * nickname is only available once the connection has been {@link #start()}ed.
 134          *
 135          * @return The current nickname
 136          */
 137         public String nickname() {
 138                 return nickname;
 139         }
 140
 141         //
 142         // MUTATORS
 143         //
 144
 145         /**
 146          * Sets the nickname chooser. The nickname chooser is only used during the
 147          * creation of the connection.
 148          *
 149          * @param nicknameChooser
 150          *              The nickname chooser
 151          * @return This connection
 152          */
 153         public Connection nicknameChooser(NicknameChooser nicknameChooser) {
 154                 this.nicknameChooser = nicknameChooser;
 155                 return this;
 156         }
 157
 158         /**
 159          * Sets the username to use.
 160          *
 161          * @param username
 162          *              The username to use
 163          * @return This connection
 164          */
 165         public Connection username(String username) {
 166                 this.username = Optional.fromNullable(username);
 167                 return this;
 168         }
 169
 170         /**
 171          * Sets the real name to use.
 172          *
 173          * @param realName
 174          *              The real name to use
 175          * @return This connection
 176          */
 177         public Connection realName(String realName) {
 178                 this.realName = Optional.fromNullable(realName);
 179                 return this;
 180         }
 181
 182         /**
 183          * Sets the optional password for the connection.
 184          *
 185          * @param password
 186          *              The password for the connection
 187          * @return This connection
 188          */
 189         public Connection password(String password) {
 190                 this.password = Optional.fromNullable(password);
 191                 return this;
 192         }
 193
 194         //
 195         // ACTIONS
 196         //
 197
 198         /**
 199          * Joins the given channel.
 200          *
 201          * @param channel
 202          *              The channel to join
 203          * @throws IOException
 204          *              if an I/O error occurs
 205          */
 206         public void joinChannel(final String channel) throws IOException {
 207                 connectionHandler.sendCommand("JOIN", channel);
 208         }
 209
 210         /**
 211          * Sends a message to the given recipient, which may be a channel or another
 212          * nickname.
 213          *
 214          * @param recipient
 215          *              The recipient of the message
 216          * @param message
 217          *              The message
 218          * @throws IOException
 219          *              if an I/O error occurs
 220          */
 221         public void sendMessage(String recipient, String message) throws IOException {
 222                 connectionHandler.sendCommand("PRIVMSG", recipient, message);
 223         }
 224
 225         //
 226         // ABSTRACTEXECUTIONTHREADSERVICE METHODS
 227         //
 228
 229         @Override
 230         protected void startUp() throws IllegalStateException {
 231                 checkState(username.isPresent(), "username must be set");
 232                 checkState(realName.isPresent(), "realName must be set");
 233         }
 234
 235         @Override
 236         protected void run() {
 237
 238                 /* connect to remote socket. */
 239                 try {
 240                         Socket socket = socketFactory.createSocket(hostname, port);
 241                         connectionHandler = new ConnectionHandler(socket.getInputStream(), socket.getOutputStream());
 242
 243                         /* register connection. */
 244                         if (password.isPresent()) {
 245                                 connectionHandler.sendCommand("PASSWORD", password.get());
 246                         }
 247                         connectionHandler.sendCommand("USER", username.get(), "8", "*", realName.get());
 248                         nickname = nicknameChooser.getNickname();
 249                         connectionHandler.sendCommand("NICK", nickname);
 250
 251                 } catch (IOException ioe1) {
 252                         eventBus.post(new ConnectionFailed(this, ioe1));
 253                         return;
 254                 }
 255
 256                 /* now read replies and react. */
 257                 try {
 258                         /* some status variables. */
 259                         int oldConnectionStatus = 0;
 260                         int connectionStatus = 0;
 261                         boolean connected = true;
 262                         StringBuilder motd = new StringBuilder();
 263                         Set<Nickname> nicks = Sets.newHashSet();
 264
 265                         /* server modes. */
 266                         Map<String, String> nickPrefixes = Maps.newHashMap();
 267                         Set<Character> channelTypes = Sets.newHashSet();
 268
 269                         while (connected) {
 270                                 Reply reply = connectionHandler.readReply();
 271                                 logger.finest(String.format("<< %s", reply));
 272                                 String command = reply.command();
 273                                 List<String> parameters = reply.parameters();
 274
 275                                 /* most common events. */
 276                                 if (command.equalsIgnoreCase("PRIVMSG")) {
 277                                         String recipient = parameters.get(0);
 278                                         String message = parameters.get(1);
 279                                         if (!channelTypes.contains(recipient.charAt(0))) {
 280                                                 eventBus.post(new PrivateMessageReceived(this, reply.source().get(), message));
 281                                         } else {
 282                                                 eventBus.post(new ChannelMessageReceived(this, recipient, reply.source().get(), message));
 283                                         }
 284
 285                                 /* replies 001-004 don’t hold information but they have to be sent on a successful connection. */
 286                                 } else if (command.equals("001")) {
 287                                         connectionStatus |= 0x01;
 288                                 } else if (command.equals("002")) {
 289                                         connectionStatus |= 0x02;
 290                                 } else if (command.equals("003")) {
 291                                         connectionStatus |= 0x04;
 292                                 } else if (command.equals("004")) {
 293                                         connectionStatus |= 0x08;
 294
 295                                 /* 005 originally was a bounce message, now used to transmit useful information about the server. */
 296                                 } else if (command.equals("005")) {
 297                                         for (String parameter : parameters) {
 298                                                 if (parameter.startsWith("PREFIX=")) {
 299                                                         int openParen = parameter.indexOf('(');
 300                                                         int closeParen = parameter.indexOf(')');
 301                                                         if ((openParen != -1) && (closeParen != -1)) {
 302                                                                 for (int modeCharacterIndex = 1; modeCharacterIndex < (closeParen - openParen); ++modeCharacterIndex) {
 303                                                                         char modeCharacter = parameter.charAt(openParen + modeCharacterIndex);
 304                                                                         char modeSymbol = parameter.charAt(closeParen + modeCharacterIndex);
 305                                                                         nickPrefixes.put(String.valueOf(modeSymbol), String.valueOf(modeCharacter));
 306                                                                 }
 307                                                                 logger.fine(String.format("Parsed Prefixes: %s", nickPrefixes));
 308                                                         }
 309                                                 } else if (parameter.startsWith("CHANTYPES=")) {
 310                                                         for (int typeIndex = 10; typeIndex < parameter.length(); ++typeIndex) {
 311                                                                 channelTypes.add(parameter.charAt(typeIndex));
 312                                                         }
 313                                                         logger.fine(String.format("Parsed Channel Types: %s", channelTypes));
 314                                                 }
 315                                         }
 316
 317                                 /* 375, 372, and 376 handle the server’s MOTD. */
 318                                 } else if (command.equals("375")) {
 319                                         /* MOTD starts. */
 320                                         motd.append(parameters.get(1)).append('\n');
 321                                 } else if (command.equals("372")) {
 322                                         motd.append(parameters.get(1)).append('\n');
 323                                 } else if (command.equals("376")) {
 324                                         motd.append(parameters.get(1)).append('\n');
 325                                         eventBus.post(new MotdReceived(this, motd.toString()));
 326                                         motd.setLength(0);
 327
 328                                 /* 43x replies are for nick change errors. */
 329                                 } else if (command.equals("431")) {
 330                                         eventBus.post(new NoNicknameGivenReceived(this, reply));
 331                                 } else if (command.equals("433")) {
 332                                         if (connectionStatus == 0) {
 333                                                 nickname = nicknameChooser.getNickname();
 334                                                 connectionHandler.sendCommand("NICK", nickname);
 335                                         } else {
 336                                                 eventBus.post(new NicknameInUseReceived(this, reply));
 337                                         }
 338
 339                                 /* channel stuff. */
 340                                 } else if (command.equalsIgnoreCase("JOIN")) {
 341                                         eventBus.post(new ChannelJoined(this, parameters.get(0), reply.source().get()));
 342                                 } else if (command.equals("331")) {
 343                                         /* no topic is set. */
 344                                 } else if (command.equals("332")) {
 345                                         eventBus.post(new ChannelTopic(this, parameters.get(1), parameters.get(2)));
 346                                 } else if (command.equals("353")) {
 347                                         for (String nickname : parameters.get(3).split(" ")) {
 348                                                 if (nickPrefixes.containsKey(nickname.substring(0, 1))) {
 349                                                         nicks.add(new Nickname(nickname.substring(1), nickname.substring(0, 1)));
 350                                                 } else {
 351                                                         nicks.add(new Nickname(nickname, ""));
 352                                                 }
 353                                         }
 354                                 } else if (command.equals("366")) {
 355                                         eventBus.post(new ChannelNicknames(this, parameters.get(1), nicks));
 356                                         nicks.clear();
 357
 358                                 /* common channel join errors. */
 359                                 } else if (command.equals("474")) {
 360                                         eventBus.post(new ChannelNotJoined(this, parameters.get(1), Reason.banned));
 361                                 } else if (command.equals("473")) {
 362                                         eventBus.post(new ChannelNotJoined(this, parameters.get(1), Reason.inviteOnly));
 363                                 } else if (command.equals("475")) {
 364                                         eventBus.post(new ChannelNotJoined(this, parameters.get(1), Reason.badChannelKey));
 365
 366                                 /* basic connection housekeeping. */
 367                                 } else if (command.equalsIgnoreCase("PING")) {
 368                                         connectionHandler.sendCommand("PONG", getOptional(parameters, 0), getOptional(parameters, 1));
 369
 370                                 /* okay, everything else. */
 371                                 } else {
 372                                         eventBus.post(new UnknownReplyReceived(this, reply));
 373                                 }
 374
 375                                 if ((connectionStatus == 0x0f) && (connectionStatus != oldConnectionStatus)) {
 376                                         /* connection succeeded! */
 377                                         eventBus.post(new ConnectionEstablished(this));
 378                                 }
 379                                 oldConnectionStatus = connectionStatus;
 380                         }
 381                 } catch (IOException ioe1) {
 382                         logger.log(Level.WARNING, "I/O error", ioe1);
 383                 } finally {
 384                         logger.info("Closing Connection.");
 385                         try {
 386                                 Closeables.close(connectionHandler, true);
 387                         } catch (IOException ioe1) {
 388                                 /* will not be thrown. */
 389                         }
 390                 }
 391
 392         }
 393
 394         //
 395         // PRIVATE METHODS
 396         //
 397
 398         /**
 399          * Returns an item from the list, or {@link Optional#absent()} if the list is
 400          * shorter than required for the given index.
 401          *
 402          * @param list
 403          *              The list to get an item from
 404          * @param index
 405          *              The index of the item
 406          * @param <T>
 407          *              The type of the list items
 408          * @return This list item wrapped in an {@link Optional}, or {@link
 409          *         Optional#absent()} if the list is not long enough
 410          */
 411         private static <T> Optional<T> getOptional(List<T> list, int index) {
 412                 if (index < list.size()) {
 413                         return Optional.fromNullable(list.get(index));
 414                 }
 415                 return Optional.absent();
 416         }
 417
 418         /** Handles input and output for the connection. */
 419         private class ConnectionHandler implements Closeable {
 420
 421                 /** The output stream of the connection. */
 422                 private final OutputStream outputStream;
 423
 424                 /** The input stream of the connection. */
 425                 private final BufferedReader inputStreamReader;
 426
 427                 /**
 428                  * Creates a new connection handler for the given input stream and output
 429                  * stream.
 430                  *
 431                  * @param inputStream
 432                  *              The input stream of the connection
 433                  * @param outputStream
 434                  *              The output stream of the connection
 435                  * @throws UnsupportedEncodingException
 436                  *              if the encoding (currently “UTF-8”) is not valid
 437                  */
 438                 private ConnectionHandler(InputStream inputStream, OutputStream outputStream) throws UnsupportedEncodingException {
 439                         this.outputStream = outputStream;
 440                         inputStreamReader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"));
 441                 }
 442
 443                 //
 444                 // ACTIONS
 445                 //
 446
 447                 /**
 448                  * Sends a command with the given parameters, skipping all {@link
 449                  * Optional#absent()} optionals.
 450                  *
 451                  * @param command
 452                  *              The command to send
 453                  * @param parameters
 454                  *              The parameters
 455                  * @throws IOException
 456                  *              if an I/O error occurs
 457                  */
 458                 public void sendCommand(String command, Optional<String>... parameters) throws IOException {
 459                         List<String> setParameters = new ArrayList<String>();
 460                         for (Optional<String> maybeSetParameter : parameters) {
 461                                 if (maybeSetParameter.isPresent()) {
 462                                         setParameters.add(maybeSetParameter.get());
 463                                 }
 464                         }
 465                         sendCommand(command, setParameters.toArray(new String[setParameters.size()]));
 466                 }
 467
 468                 /**
 469                  * Sends a command with the given parameters.
 470                  *
 471                  * @param command
 472                  *              The command to send
 473                  * @param parameters
 474                  *              The parameters of the command
 475                  * @throws IOException
 476                  *              if an I/O error occurs
 477                  * @throws IllegalArgumentException
 478                  *              if any parameter but that last contains a space character
 479                  */
 480                 public void sendCommand(String command, String... parameters) throws IOException, IllegalArgumentException {
 481                         StringBuilder commandBuilder = new StringBuilder();
 482
 483                         commandBuilder.append(command);
 484                         for (int parameterIndex = 0; parameterIndex < parameters.length; ++parameterIndex) {
 485                                 String parameter = parameters[parameterIndex];
 486                                 /* space is only allowed in the last parameter. */
 487                                 commandBuilder.append(' ');
 488                                 if (parameter.contains(" ")) {
 489                                         if (parameterIndex == (parameters.length - 1)) {
 490                                                 commandBuilder.append(':');
 491                                         } else {
 492                                                 throw new IllegalArgumentException(String.format("parameter “%s” must not contain space!", parameter));
 493                                         }
 494                                 }
 495                                 commandBuilder.append(parameter);
 496                         }
 497
 498                         logger.finest(String.format(">> %s", commandBuilder));
 499                         outputStream.write((commandBuilder.toString() + "\r\n").getBytes("UTF-8"));
 500                         outputStream.flush();
 501                 }
 502
 503                 /**
 504                  * Reads a line of reply from the connection.
 505                  *
 506                  * @return The reply
 507                  * @throws IOException
 508                  *              if an I/O error occurs
 509                  * @throws EOFException
 510                  *              if EOF was reached
 511                  */
 512                 public Reply readReply() throws IOException, EOFException {
 513                         String line = inputStreamReader.readLine();
 514                         if (line == null) {
 515                                 throw new EOFException();
 516                         }
 517
 518                         return Reply.parseLine(line);
 519                 }
 520
 521                 //
 522                 // CLOSEABLE METHODS
 523                 //
 524
 525                 @Override
 526                 public void close() throws IOException {
 527                         Closeables.close(outputStream, true);
 528                         Closeables.close(inputStreamReader, true);
 529                 }
 530
 531         }
 532
 533 }