Hide sign contents with packet filter

Signed-off-by: Lixfel <agga-games@gmx.de>

FightSystem_Main/src/de/steamwar/fightsystem/utils/TechHider.java

@@ -67,6 +67,7 @@ public class TechHider {
         blockActionHider();
         blockHider();
         multiBlockHider();
+        updateBlockEntity();
         switch(Core.getVersion()){
             case 15:
                 TechHider_15.start();
@@ -168,6 +169,29 @@ public class TechHider {
         });
     }
 
+    private static void updateBlockEntity(){
+        if(Core.getVersion() < 9)
+            return;
+
+        ProtocolLibrary.getProtocolManager().addPacketListener(new PacketAdapter(FightSystem.getPlugin(), PacketType.Play.Server.TILE_ENTITY_DATA) {
+            @Override
+            public void onPacketSending(PacketEvent event) {
+                PacketContainer packet = event.getPacket();
+                BlockPosition pos = packet.getBlockPositionModifier().read(0);
+
+                Player p = event.getPlayer();
+                if(bypass(p, ITechHider.posToChunk(pos.getX()), ITechHider.posToChunk(pos.getZ())))
+                    return;
+
+                // 9 == Set sign text
+                if(packet.getBytes().read(0) != 9)
+                    return;
+
+                event.setCancelled(true);
+            }
+        });
+    }
+
     public static List<Pair<Integer, Integer>> prepareChunkReload(Player p){
         if(disabled())
             return Collections.emptyList();