src/main/java/net/pterodactylus/irc/connection/CtcpHandler.java

   1 package net.pterodactylus.irc.connection;
   2
   3 import static com.google.common.base.Optional.absent;
   4 import static com.google.common.base.Optional.fromNullable;
   5 import static com.google.common.base.Optional.of;
   6 import static java.lang.String.format;
   7 import static java.net.InetAddress.getByName;
   8 import static org.apache.log4j.Logger.getLogger;
   9
  10 import java.net.InetAddress;
  11 import java.net.UnknownHostException;
  12 import java.util.List;
  13
  14 import net.pterodactylus.irc.Connection;
  15 import net.pterodactylus.irc.Reply;
  16 import net.pterodactylus.irc.Source;
  17 import net.pterodactylus.irc.event.DccAcceptReceived;
  18 import net.pterodactylus.irc.event.DccSendReceived;
  19
  20 import com.google.common.base.Optional;
  21 import com.google.common.eventbus.EventBus;
  22 import com.google.common.primitives.Ints;
  23 import com.google.common.primitives.Longs;
  24 import org.apache.log4j.Logger;
  25
  26 /**
  27  * Handles all CTCP messages relevant to DCC transfers.
  28  *
  29  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  30  */
  31 public class CtcpHandler implements Handler {
  32
  33         private static final Logger logger = getLogger(CtcpHandler.class);
  34         private final EventBus eventBus;
  35         private final Connection connection;
  36
  37         public CtcpHandler(EventBus eventBus, Connection connection) {
  38                 this.eventBus = eventBus;
  39                 this.connection = connection;
  40         }
  41
  42         @Override
  43         public boolean willHandle(Reply reply) {
  44                 return (commandIs(reply, "PRIVMSG") || commandIs(reply, "NOTICE"))
  45                                 && messageIsCtcp(reply.parameters().get(1));
  46         }
  47
  48         private boolean commandIs(Reply reply, String command) {
  49                 return reply.command().equalsIgnoreCase(command);
  50         }
  51
  52         private boolean messageIsCtcp(String message) {
  53                 return message.startsWith("\u0001") && message.endsWith("\u0001");
  54         }
  55
  56         @Override
  57         public void handleReply(Reply reply) {
  58                 List<String> parameters = reply.parameters();
  59                 String message = parameters.get(1);
  60                 Source source = reply.source().get();
  61                 handleCtcp(source, message);
  62         }
  63
  64         private void handleCtcp(Source client, String message) {
  65                 String[] messageWords = message.substring(1, message.length() - 1).split(" +");
  66                 String ctcpCommand = messageWords[0];
  67                 if (ctcpCommand.equalsIgnoreCase("DCC")) {
  68                         if (messageWords[1].equalsIgnoreCase("SEND")) {
  69                                 Optional<InetAddress> inetAddress = parseInetAddress(messageWords[3]);
  70                                 Optional<Integer> port = fromNullable(Ints.tryParse(messageWords[4]));
  71                                 long fileSize = fromNullable(Longs.tryParse(messageWords[5])).or(-1L);
  72                                 if (inetAddress.isPresent() && port.isPresent()) {
  73                                         eventBus.post(new DccSendReceived(connection, client, messageWords[2], inetAddress.get(), port.get(), fileSize));
  74                                 } else {
  75                                         logger.warn(format("Received malformed DCC SEND: “%s”", message));
  76                                 }
  77                         } else if (messageWords[1].equalsIgnoreCase("ACCEPT")) {
  78                                 Optional<Integer> port = fromNullable(Ints.tryParse(messageWords[3]));
  79                                 long position = (messageWords.length > 4) ? fromNullable(Longs.tryParse(messageWords[4])).or(-1L) : -1;
  80                                 if (port.isPresent()) {
  81                                         eventBus.post(new DccAcceptReceived(connection, client, messageWords[2], port.get(), position));
  82                                 } else {
  83                                         logger.warn(format("Received malformed DCC ACCEPT: “%s”", message));
  84                                 }
  85                         }
  86                 }
  87         }
  88
  89         private Optional<InetAddress> parseInetAddress(String ip) {
  90                 Long ipNumber = Longs.tryParse(ip);
  91                 if (ipNumber == null) {
  92                         return absent();
  93                 }
  94
  95                 StringBuilder hostname = new StringBuilder(15);
  96                 hostname.append((ipNumber >>> 24) & 0xff).append('.');
  97                 hostname.append((ipNumber >>> 16) & 0xff).append('.');
  98                 hostname.append((ipNumber >>> 8) & 0xff).append('.');
  99                 hostname.append(ipNumber & 0xff);
 100                 try {
 101                         return of(getByName(hostname.toString()));
 102                 } catch (UnknownHostException uhe1) {
 103                         return absent();
 104                 }
 105         }
 106
 107 }