Added the ability to intercept serialized input packets on CraftBukkit.

Spigot will be added later.

ProtocolLib/src/main/java/com/comphenix/protocol/events/ListeningWhitelist.java

@@ -97,7 +97,10 @@ public class ListeningWhitelist {
 		this.priority = priority;
 		this.whitelist = Sets.newHashSet(whitelist);
 		this.gamePhase = gamePhase;
-		this.options.addAll(Arrays.asList(options));
+		
+		if (options != null) {
+			this.options.addAll(Arrays.asList(options));
+		}
 	}
 	
 	/**

ProtocolLib/src/main/java/com/comphenix/protocol/events/NetworkMarker.java

@@ -130,4 +130,23 @@ public class NetworkMarker {
 	public static boolean hasOutputHandlers(NetworkMarker marker) {
 		return marker != null && !marker.getOutputHandlers().isEmpty();
 	}
+	
+	/**
+	 * Retrieve the byte buffer stored in the given marker.
+	 * @param marker - the marker.
+	 * @return The byte buffer, or NULL if not found.
+	 */
+	public static byte[] getByteBuffer(NetworkMarker marker) {
+		if (marker != null) {
+			ByteBuffer buffer = marker.getInputBuffer();
+			
+			if (buffer != null) {
+				byte[] data = new byte[buffer.remaining()];
+				
+				buffer.get(data, 0, data.length);
+				return data;
+			}
+		}
+		return null;
+	}
 }

ProtocolLib/src/main/java/com/comphenix/protocol/events/PacketAdapter.java

@@ -30,7 +30,6 @@ import com.comphenix.protocol.injector.GamePhase;
  * @author Kristian
  */
 public abstract class PacketAdapter implements PacketListener {
-	
 	protected Plugin plugin;
 	protected ConnectionSide connectionSide;
 	protected ListeningWhitelist receivingWhitelist = ListeningWhitelist.EMPTY_WHITELIST;
@@ -95,6 +94,17 @@ public abstract class PacketAdapter implements PacketListener {
 		this(plugin, connectionSide, listenerPriority, GamePhase.PLAYING, packets);
 	}
 	
+	/**
+	 * Initialize a packet listener for a single connection side.
+	 * @param plugin - the plugin that spawned this listener.
+	 * @param connectionSide - the packet type the listener is looking for.
+	 * @param options - which listener options to use.
+	 * @param packets - the packet IDs the listener is looking for.
+	 */
+	public PacketAdapter(Plugin plugin, ConnectionSide connectionSide, ListenerOptions[] options, Integer... packets) {
+		this(plugin, connectionSide, ListenerPriority.NORMAL, GamePhase.PLAYING, options, packets);
+	}
+	
 	/**
 	 * Initialize a packet listener for a single connection side.
 	 * @param plugin - the plugin that spawned this listener.
@@ -117,6 +127,23 @@ public abstract class PacketAdapter implements PacketListener {
 	 * @param packets - the packet IDs the listener is looking for.
 	 */
 	public PacketAdapter(Plugin plugin, ConnectionSide connectionSide, ListenerPriority listenerPriority, GamePhase gamePhase, Integer... packets) {
+		this(plugin, connectionSide, listenerPriority, gamePhase, new ListenerOptions[0], packets);
+	}
+	
+	/**
+	 * Initialize a packet listener for a single connection side.
+	 * <p>
+	 * The game phase is used to optmize performance. A listener should only choose BOTH or LOGIN if it's absolutely necessary.
+	 * <p>
+	 * Listener options must be specified in order for {@link NetworkMarker#getInputBuffer()} to function correctly.
+	 * @param plugin - the plugin that spawned this listener.
+	 * @param connectionSide - the packet type the listener is looking for.
+	 * @param listenerPriority - the event priority.
+	 * @param gamePhase - which game phase this listener is active under.
+	 * @param options - which listener options to use.
+	 * @param packets - the packet IDs the listener is looking for.
+	 */
+	public PacketAdapter(Plugin plugin, ConnectionSide connectionSide, ListenerPriority listenerPriority, GamePhase gamePhase, ListenerOptions[] options, Integer... packets) {
 		if (plugin == null)
 			throw new IllegalArgumentException("plugin cannot be null");
 		if (connectionSide == null)
@@ -127,12 +154,14 @@ public abstract class PacketAdapter implements PacketListener {
 			throw new IllegalArgumentException("gamePhase cannot be NULL");
 		if (packets == null)
 			throw new IllegalArgumentException("packets cannot be null");
+		if (options == null)
+			throw new IllegalArgumentException("options cannot be null");
 		
 		// Add whitelists
 		if (connectionSide.isForServer())
-			sendingWhitelist = new ListeningWhitelist(listenerPriority, packets, gamePhase);
+			sendingWhitelist = new ListeningWhitelist(listenerPriority, packets, gamePhase, options);
 		if (connectionSide.isForClient())
-			receivingWhitelist = new ListeningWhitelist(listenerPriority, packets, gamePhase);
+			receivingWhitelist = new ListeningWhitelist(listenerPriority, packets, gamePhase, options);
 		
 		this.plugin = plugin;
 		this.connectionSide = connectionSide;
@@ -180,7 +209,6 @@ public abstract class PacketAdapter implements PacketListener {
 	 * @return Name of the given plugin.
 	 */
 	public static String getPluginName(Plugin plugin) {
-
 		// Try to get the plugin name
 		try {
 			if (plugin == null)

ProtocolLib/src/main/java/com/comphenix/protocol/injector/ListenerInvoker.java

@@ -52,6 +52,13 @@ public interface ListenerInvoker {
 	 */
 	public InterceptWritePacket getInterceptWritePacket();
 	
+	/**
+	 * Determine if a given packet requires input buffering.
+	 * @param packetId - the packet to check.
+	 * @return TRUE if it does, FALSE otherwise.
+	 */
+	public boolean requireInputBuffer(int packetId);
+	
 	/**
 	 * Associate a given class with the given packet ID. Internal method.
 	 * @param clazz - class to associate.

ProtocolLib/src/main/java/com/comphenix/protocol/injector/PacketFilterManager.java

@@ -46,9 +46,11 @@ import org.bukkit.plugin.Plugin;
 import org.bukkit.plugin.PluginManager;
 
 import com.comphenix.protocol.AsynchronousManager;
+import com.comphenix.protocol.Packets;
 import com.comphenix.protocol.ProtocolManager;
 import com.comphenix.protocol.async.AsyncFilterManager;
 import com.comphenix.protocol.async.AsyncMarker;
+import com.comphenix.protocol.concurrency.IntegerSet;
 import com.comphenix.protocol.error.ErrorReporter;
 import com.comphenix.protocol.error.Report;
 import com.comphenix.protocol.error.ReportType;
@@ -138,6 +140,9 @@ public final class PacketFilterManager implements ProtocolManager, ListenerInvok
 	// Intercepting write packet methods
 	private InterceptWritePacket interceptWritePacket;
 	
+	// Whether or not a packet must be input buffered
+	private volatile IntegerSet inputBufferedPackets = new IntegerSet(Packets.MAXIMUM_PACKET_ID + 1);
+	
 	// The two listener containers
 	private SortedPacketListenerList recievedListeners;
 	private SortedPacketListenerList sendingListeners;
@@ -323,6 +328,11 @@ public final class PacketFilterManager implements ProtocolManager, ListenerInvok
 		if (hasSending || hasReceiving) {
 			// Add listeners and hooks
 			if (hasSending) {
+				// This doesn't make any sense
+				if (sending.getOptions().contains(ListenerOptions.INTERCEPT_INPUT_BUFFER)) {
+					throw new IllegalArgumentException("Sending whitelist cannot require input bufferes to be intercepted.");
+				}
+				
 				verifyWhitelist(listener, sending);
 				sendingListeners.addListener(listener, sending);
 				enablePacketFilters(listener, ConnectionSide.SERVER_SIDE, sending.getWhitelist());
@@ -344,9 +354,30 @@ public final class PacketFilterManager implements ProtocolManager, ListenerInvok
 			
 			// Inform our injected hooks
 			packetListeners.add(listener);
+			updateRequireInputBuffers();
 		}
 	}
 	
+	/**
+	 * Invoked when we need to update the input buffer set.
+	 */
+	private void updateRequireInputBuffers() {
+		IntegerSet updated = new IntegerSet(Packets.MAXIMUM_PACKET_ID + 1);
+		
+		for (PacketListener listener : packetListeners) {
+			ListeningWhitelist whitelist = listener.getReceivingWhitelist();
+			
+			// We only check the recieving whitelist
+			if (whitelist.getOptions().contains(ListenerOptions.INTERCEPT_INPUT_BUFFER)) {
+				for (int id : whitelist.getWhitelist()) {
+					updated.add(id);
+				}
+			}
+		}
+		// Update it
+		this.inputBufferedPackets = updated;
+	}
+
 	/**
 	 * Invoked to handle the different game phases of a added listener.
 	 * @param phase - listener's game game phase.
@@ -437,6 +468,7 @@ public final class PacketFilterManager implements ProtocolManager, ListenerInvok
 			disablePacketFilters(ConnectionSide.SERVER_SIDE, sendingRemoved);
 		if (receivingRemoved != null && receivingRemoved.size() > 0)
 			disablePacketFilters(ConnectionSide.CLIENT_SIDE, receivingRemoved);
+		updateRequireInputBuffers();
 	}
 	
 	@Override
@@ -468,6 +500,11 @@ public final class PacketFilterManager implements ProtocolManager, ListenerInvok
 		}
 	}
 
+	@Override
+	public boolean requireInputBuffer(int packetId) {
+		return inputBufferedPackets.contains(packetId);
+	}
+	
 	/**
 	 * Handle a packet sending or receiving event.
 	 * <p>
@@ -617,7 +654,8 @@ public final class PacketFilterManager implements ProtocolManager, ListenerInvok
 		packetInjector.undoCancel(packet.getID(), mcPacket);
 		
 		if (filters) {
-			PacketEvent event  = packetInjector.packetRecieved(packet, sender);
+			byte[] data = NetworkMarker.getByteBuffer(marker);
+			PacketEvent event  = packetInjector.packetRecieved(packet, sender, data);
 			
 			if (!event.isCancelled())
 				mcPacket = event.getPacket().getHandle();

ProtocolLib/src/main/java/com/comphenix/protocol/injector/packet/CaptureInputStream.java

@@ -0,0 +1,64 @@
+package com.comphenix.protocol.injector.packet;
+
+import java.io.FilterInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+/**
+ * Represents an input stream that stores every read block of bytes in another output stream.
+ * 
+ * @author Kristian
+ */
+class CaptureInputStream extends FilterInputStream {
+	protected OutputStream out;
+	
+	public CaptureInputStream(InputStream in, OutputStream out) {
+		super(in);
+		this.out = out;
+	}
+	
+	@Override
+	public int read() throws IOException {
+		int value = super.read();
+		
+		// Write the byte
+		if (value >= 0)
+			out.write(value);
+		return value;
+	}
+	
+	@Override
+	public void close() throws IOException {
+		super.close();
+		out.close();
+	}
+	
+	@Override
+	public int read(byte[] b) throws IOException {
+		int count = super.read(b);
+		
+		if (count > 0 ) {
+			out.write(b, 0, count);
+		}
+		return count;
+	}
+	
+	@Override
+	public int read(byte[] b, int off, int len) throws IOException {
+		int count = super.read(b, off, len);
+		
+		if (count > 0 ) {
+			out.write(b, off, count);
+		}
+		return count;
+	}
+	
+	/**
+	 * Retrieve the output stream that recieves all the read information.
+	 * @return The output stream everything is copied to.
+	 */
+	public OutputStream getOutputStream() {
+		return out;
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/injector/packet/PacketInjector.java

@@ -51,9 +51,10 @@ public interface PacketInjector {
 	 * Let the packet listeners process the given packet.
 	 * @param packet - a packet to process.
 	 * @param client - the client that sent the packet.
+	 * @param buffered - a buffer containing the data that had to be read in order to construct the packet.
 	 * @return The resulting packet event.
 	 */
-	public abstract PacketEvent packetRecieved(PacketContainer packet, Player client);
+	public abstract PacketEvent packetRecieved(PacketContainer packet, Player client, byte[] buffered);
 
 	/**
 	 * Perform any necessary cleanup before unloading ProtocolLib.

ProtocolLib/src/main/java/com/comphenix/protocol/injector/packet/ProxyPacketInjector.java

@@ -36,6 +36,8 @@ import com.comphenix.protocol.Packets;
 import com.comphenix.protocol.error.ErrorReporter;
 import com.comphenix.protocol.error.Report;
 import com.comphenix.protocol.error.ReportType;
+import com.comphenix.protocol.events.ConnectionSide;
+import com.comphenix.protocol.events.NetworkMarker;
 import com.comphenix.protocol.events.PacketContainer;
 import com.comphenix.protocol.events.PacketEvent;
 import com.comphenix.protocol.injector.ListenerInvoker;
@@ -298,6 +300,15 @@ class ProxyPacketInjector implements PacketInjector {
 		return true;
 	}
 	
+	/**
+	 * Determine if the data a packet read must be buffered.
+	 * @param packetId - the packet to check.
+	 * @return TRUE if it does, FALSE otherwise.
+	 */
+	public boolean requireInputBuffers(int packetId) {
+		return manager.requireInputBuffer(packetId);
+	}
+	
 	@Override
 	public boolean hasPacketHandler(int packetID) {
 		return PacketRegistry.getPreviousPackets().containsKey(packetID);
@@ -309,13 +320,13 @@ class ProxyPacketInjector implements PacketInjector {
 	}
 	
 	// Called from the ReadPacketModified monitor
-	public PacketEvent packetRecieved(PacketContainer packet, DataInputStream input) {
+	public PacketEvent packetRecieved(PacketContainer packet, DataInputStream input, byte[] buffered) {
 		try {
 			Player client = playerInjection.getPlayerByConnection(input);
 
 			// Never invoke a event if we don't know where it's from
 			if (client != null) {
-				return packetRecieved(packet, client);
+				return packetRecieved(packet, client, buffered);
 			} else {
 				// Hack #2 - Caused by our server socket injector
 				if (packet.getID() != Packets.Client.GET_INFO)
@@ -330,15 +341,10 @@ class ProxyPacketInjector implements PacketInjector {
 		} 
 	}
 	
-	/**
-	 * Let the packet listeners process the given packet.
-	 * @param packet - a packet to process.
-	 * @param client - the client that sent the packet.
-	 * @return The resulting packet event.
-	 */
 	@Override
-	public PacketEvent packetRecieved(PacketContainer packet, Player client) {
+	public PacketEvent packetRecieved(PacketContainer packet, Player client, byte[] buffered) {
-		PacketEvent event = PacketEvent.fromClient((Object) manager, packet, client);
+		NetworkMarker marker = buffered != null ? new NetworkMarker(ConnectionSide.CLIENT_SIDE, buffered) : null;
+		PacketEvent event = PacketEvent.fromClient((Object) manager, packet, marker, client);
 		
 		manager.invokePacketRecieving(event);
 		return event;

ProtocolLib/src/main/java/com/comphenix/protocol/injector/packet/ReadPacketModifier.java

@@ -17,7 +17,9 @@
 
 package com.comphenix.protocol.injector.packet;
 
+import java.io.ByteArrayOutputStream;
 import java.io.DataInputStream;
+import java.io.InputStream;
 import java.lang.reflect.Method;
 import java.util.Map;
 
@@ -89,6 +91,18 @@ class ReadPacketModifier implements MethodInterceptor {
 		Object overridenObject = override.get(thisObj);
 		Object returnValue = null;
 		
+		ByteArrayOutputStream bufferStream = null;
+		
+		// See if we need to buffer the read data
+		if (isReadPacketDataMethod && packetInjector.requireInputBuffers(packetID)) {
+			CaptureInputStream captured = new CaptureInputStream(
+				(InputStream) args[0], 
+				bufferStream = new ByteArrayOutputStream()); 
+			
+			// Stash it back
+			args[0] = new DataInputStream(captured);
+		}
+		
 		if (overridenObject != null) {
 			// This packet has been cancelled
 			if (overridenObject == CANCEL_MARKER) {
@@ -109,10 +123,11 @@ class ReadPacketModifier implements MethodInterceptor {
 			try {
 				// We need this in order to get the correct player
 				DataInputStream input = (DataInputStream) args[0];
+				byte[] buffer = bufferStream != null ? bufferStream.toByteArray() : null;
 				
 				// Let the people know
 				PacketContainer container = new PacketContainer(packetID, thisObj);
-				PacketEvent event = packetInjector.packetRecieved(container, input);
+				PacketEvent event = packetInjector.packetRecieved(container, input, buffer);
 				
 				// Handle override
 				if (event != null) {

ProtocolLib/src/main/java/com/comphenix/protocol/injector/spigot/DummyPacketInjector.java

@@ -51,7 +51,7 @@ class DummyPacketInjector implements PacketInjector {
 	}
 
 	@Override
-	public PacketEvent packetRecieved(PacketContainer packet, Player client) {
+	public PacketEvent packetRecieved(PacketContainer packet, Player client, byte[] buffered) {
 		return injector.packetReceived(packet, client);
 	}