Scissors/patches/server/0047-Fix-invalid-armor-trim-exploit.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Luna <lunahatesgogle@gmail.com>
Date: Mon, 12 Jun 2023 17:32:04 -0300
Subject: [PATCH] Fix invalid armor trim exploit


diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaArmor.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaArmor.java
index c92981aedebe934cefa1c96a0328fb91fe17acbc..2eb3705e1efdd62fa176bf4a1ec126181d083505 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaArmor.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaArmor.java
@@ -68,10 +68,15 @@ public class CraftMetaArmor extends CraftMetaItem implements ArmorMeta {
             CompoundTag trimCompound = tag.getCompound(TRIM.NBT);
 
             if (trimCompound.contains(TRIM_MATERIAL.NBT, net.minecraft.nbt.Tag.TAG_STRING) && trimCompound.contains(TRIM_PATTERN.NBT, net.minecraft.nbt.Tag.TAG_STRING)) { // Paper - for now, ignore inline definitions of trim material & pattern
-                TrimMaterial trimMaterial = Registry.TRIM_MATERIAL.get(NamespacedKey.fromString(trimCompound.getString(TRIM_MATERIAL.NBT)));
-                TrimPattern trimPattern = Registry.TRIM_PATTERN.get(NamespacedKey.fromString(trimCompound.getString(TRIM_PATTERN.NBT)));
+                // Scissors start
+                NamespacedKey trimMaterialKey = NamespacedKey.fromString(trimCompound.getString(TRIM_MATERIAL.NBT));
+                NamespacedKey trimPatternKey = NamespacedKey.fromString(trimCompound.getString(TRIM_PATTERN.NBT));
 
-                this.trim = new ArmorTrim(trimMaterial, trimPattern);
+                TrimMaterial trimMaterial = trimMaterialKey != null ? Registry.TRIM_MATERIAL.get(trimMaterialKey) : null;
+                TrimPattern trimPattern = trimPatternKey != null ? Registry.TRIM_PATTERN.get(trimPatternKey) : null;
+
+                if (trimMaterial != null && trimPattern != null) this.trim = new ArmorTrim(trimMaterial, trimPattern);
+                // Scissors end
             }
         }
     }