From d04a666bc5fcd8bb3f135058fc9d15fb04564e07 Mon Sep 17 00:00:00 2001
From: "Kristian S. Stangeland" <kr_stang@hotmail.com>
Date: Sat, 15 Sep 2012 23:07:14 +0200
Subject: [PATCH] Readded a lighter version of network object injector.

This version only supports CraftBukkit 1.3.0 and later.
---
 .../injector/NetworkObjectInjector.java       | 97 +++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 ProtocolLib/src/com/comphenix/protocol/injector/NetworkObjectInjector.java

diff --git a/ProtocolLib/src/com/comphenix/protocol/injector/NetworkObjectInjector.java b/ProtocolLib/src/com/comphenix/protocol/injector/NetworkObjectInjector.java
new file mode 100644
index 00000000..2981a3db
--- /dev/null
+++ b/ProtocolLib/src/com/comphenix/protocol/injector/NetworkObjectInjector.java
@@ -0,0 +1,97 @@
+package com.comphenix.protocol.injector;
+
+import java.lang.reflect.InvocationTargetException;
+
+import net.minecraft.server.Packet;
+
+import java.lang.reflect.InvocationHandler;
+import java.lang.reflect.Proxy;
+import java.lang.reflect.Method;
+import java.util.Set;
+
+import org.bukkit.entity.Player;
+
+/**
+ * Injection method that overrides the NetworkHandler itself, and it's sendPacket-method.
+ * 
+ * @author Kristian
+ */
+public class NetworkObjectInjector extends PlayerInjector {
+	public NetworkObjectInjector(Player player, PacketFilterManager manager, Set<Integer> sendingFilters) throws IllegalAccessException {
+		super(player, manager, sendingFilters);
+	}
+
+	@Override
+	public void sendServerPacket(Packet packet, boolean filtered) throws InvocationTargetException {
+		Object networkDelegate = filtered ? networkManagerRef.getValue() : networkManagerRef.getOldValue();
+		
+		if (networkDelegate != null) {
+			try {
+				// Note that invocation target exception is a wrapper for a checked exception
+				queueMethod.invoke(networkDelegate, packet);
+				
+			} catch (IllegalArgumentException e) {
+				throw e;
+			} catch (InvocationTargetException e) {
+				throw e;
+			} catch (IllegalAccessException e) {
+				throw new IllegalStateException("Unable to access queue method.", e);
+			}
+		} else {
+			throw new IllegalStateException("Unable to load network mananager. Cannot send packet.");
+		}
+	}
+	
+	@Override
+	public void injectManager() {
+		
+		if (networkManager != null) {
+			final Class<?> networkInterface = networkManagerField.getType();
+			final Object networkDelegate = networkManagerRef.getOldValue();
+			
+			if (!networkInterface.isInterface()) {
+				throw new UnsupportedOperationException(
+						"Must use CraftBukkit 1.3.0 or later to inject into into NetworkMananger.");
+			}
+			
+			// Create our proxy object
+			Object networkProxy = Proxy.newProxyInstance(networkInterface.getClassLoader(), 
+					new Class<?>[] { networkInterface }, new InvocationHandler() {
+				
+				@Override
+				public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
+					// OH OH! The queue method!
+					if (method.equals(queueMethod)) {
+						Packet packet = (Packet) args[0];
+						
+						if (packet != null) {
+							packet = handlePacketRecieved(packet);
+							
+							// A NULL packet indicate cancelling
+							if (packet != null)
+								args[0] = packet;
+							else
+								return null;
+						}
+					}
+					
+					// Delegate to our underlying class
+					try {
+						return method.invoke(networkDelegate, args);
+					} catch (InvocationTargetException e) {
+						throw e.getCause();
+					}
+				}
+			});
+		
+			// Inject it, if we can.
+			networkManagerRef.setValue(networkProxy);
+		}
+	}
+	
+	@Override
+	public void cleanupAll() {
+		// Clean up
+		networkManagerRef.revertValue();
+	}
+}