Add non Functional NBT Checker

Signed-off-by: Chaoscaot <chaoscaot444@gmail.com>

BauSystem_15/src/de/steamwar/bausystem/features/world/InventoryListener_15.java

@@ -0,0 +1,64 @@
+/*
+ * This file is a part of the SteamWar software.
+ *
+ * Copyright (C) 2021  SteamWar.de-Serverteam
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.bausystem.features.world;
+
+import net.minecraft.server.v1_15_R1.NBTBase;
+import net.minecraft.server.v1_15_R1.NBTTagCompound;
+import net.minecraft.server.v1_15_R1.NBTTagList;
+import org.bukkit.craftbukkit.v1_15_R1.inventory.CraftItemStack;
+import org.bukkit.inventory.ItemStack;
+
+public class InventoryListener_15 {
+
+    public static boolean checkItemStack(ItemStack item) {
+        net.minecraft.server.v1_15_R1.ItemStack nmsItem = CraftItemStack.asNMSCopy(item);
+        NBTTagCompound tag = nmsItem.getTag();
+        assert tag != null;
+        NBTTagCompound blockTag = tag.getCompound("BlockEntityTag");
+        assert blockTag != null;
+        if (blockTag.hasKey("Items")) {
+            return drillDown(blockTag.getList("Items", 10), 0, 0) > 1024;
+        }
+        return false;
+    }
+
+    private static int drillDown(NBTTagList items, int layer, int start) {
+        if (layer > 2) return start;
+        int invalid = start;
+        for (NBTBase nbtBase : items) {
+            if (!(nbtBase instanceof NBTTagCompound))
+                continue;
+            NBTTagCompound slot = (NBTTagCompound) nbtBase;
+            if (slot.hasKey("tag")) {
+                invalid += slot.getByte("Count");
+                NBTTagCompound iTag = slot.getCompound("tag");
+                if (iTag.hasKey("BlockEntityTag")) {
+                    NBTTagCompound blockTag = iTag.getCompound("BlockEntityTag");
+                    if (blockTag.hasKey("Items")) {
+                        invalid = drillDown(blockTag.getList("Items", 10), layer + 1, invalid);
+                    }
+                }
+            }
+            if (invalid > 1024)
+                break;
+        }
+        return invalid;
+    }
+}

BauSystem_Main/src/de/steamwar/bausystem/features/world/InventoryListener.java

@@ -22,6 +22,7 @@ package de.steamwar.bausystem.features.world;
 import de.steamwar.bausystem.linkage.LinkageType;
 import de.steamwar.bausystem.linkage.Linked;
 import de.steamwar.core.Core;
+import de.steamwar.core.VersionedCallable;
 import org.bukkit.attribute.Attribute;
 import org.bukkit.enchantments.Enchantment;
 import org.bukkit.event.EventHandler;
@@ -60,6 +61,11 @@ public class InventoryListener implements Listener {
             }
             stack.setItemMeta(meta);
         }
+        if (VersionedCallable.<Boolean>call(new VersionedCallable<Boolean>(() -> InventoryListener_15.checkItemStack(stack), 15))) {
+            e.setCurrentItem(null);
+            return;
+        }
+
         e.setCurrentItem(stack);
     }
 }