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Hide unnecessary itemmeta from clients (#6318) 

Co-authored-by: Nassim Jahnke <jahnke.nassim@gmail.com>
Co-authored-by: Jake Potrebic <jake.m.potrebic@gmail.com>
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Noah van der Aa 2021-11-30 23:47:10 +01:00 committed by GitHub
parent bd9c2b75c7
commit e955cb5b26
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LICENSE.md
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@ -48,4 +48,5 @@ Bjarne Koll <lynxplay101@gmail.com>
MeFisto94 <MeFisto94@users.noreply.github.com>
Owen1212055 <23108066+Owen1212055@users.noreply.github.com>
LemonCaramel <admin@caramel.moe>
Noah van der Aa <ndvdaa@gmail.com>
```

100
patches/server/0815-Hide-unnecessary-itemmeta-from-clients.patch Normal file
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@ -0,0 +1,100 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Noah van der Aa <ndvdaa@gmail.com>
Date: Tue, 3 Aug 2021 17:28:27 +0200
Subject: [PATCH] Hide unnecessary itemmeta from clients
diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
index b64fbce003c00a6371a849d4835632c18ad730bb..7e2d31737bd4977c9589541e1ebdcfe4ac40a335 100644
--- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
@@ -912,6 +912,13 @@ public class PaperWorldConfig {
behaviorTickRates = loadTickRates("behavior");
}
+ public boolean hideItemmetaFromClients = true;
+ public boolean hideDurabilityFromClients = false;
+ private void getHideItemmetaFromClients() {
+ hideItemmetaFromClients = getBoolean("anticheat.obfuscation.items.hide-itemmeta", hideItemmetaFromClients);
+ hideDurabilityFromClients = getBoolean("anticheat.obfuscation.items.hide-durability", hideDurabilityFromClients);
+ }
+
private com.google.common.collect.Table<String, String, Integer> loadTickRates(String type) {
log(" " + type + ":");
com.google.common.collect.Table<String, String, Integer> table = com.google.common.collect.HashBasedTable.create();
diff --git a/src/main/java/net/minecraft/network/syncher/EntityDataSerializers.java b/src/main/java/net/minecraft/network/syncher/EntityDataSerializers.java
index 3eb6bf4258b1de4697f96c2011df493cf7414a0c..0feadee6077dd6a8d8fd05b7a7d15ec1aa728fbb 100644
--- a/src/main/java/net/minecraft/network/syncher/EntityDataSerializers.java
+++ b/src/main/java/net/minecraft/network/syncher/EntityDataSerializers.java
@@ -127,6 +127,7 @@ public class EntityDataSerializers {
public static final EntityDataSerializer<ItemStack> ITEM_STACK = new EntityDataSerializer<ItemStack>() {
@Override
public void write(FriendlyByteBuf buf, ItemStack value) {
+ net.minecraft.world.entity.LivingEntity.stripMeta(value, null); // Paper - strip items to prevent oversized data
buf.writeItem(value);
}
diff --git a/src/main/java/net/minecraft/world/entity/LivingEntity.java b/src/main/java/net/minecraft/world/entity/LivingEntity.java
index 62daf918d4ab00963041ca869ae718f14f2e3337..50d0280f3df59952d682f137197fd73644ba2cfe 100644
--- a/src/main/java/net/minecraft/world/entity/LivingEntity.java
+++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java
@@ -3047,11 +3047,59 @@ public abstract class LivingEntity extends Entity {
}
+ public static void stripMeta(ItemStack itemStack, @org.jetbrains.annotations.Nullable Level level) {
+ if (itemStack.getTag() != null) {
+ CompoundTag nbt = itemStack.getTag();
+ if (level != null && level.paperConfig.hideDurabilityFromClients) {
+ // Only show damage values for elytra's, since they show a different texture when broken.
+ if (!itemStack.is(Items.ELYTRA) || itemStack.getDamageValue() < itemStack.getMaxDamage() - 1) {
+ itemStack.setDamageValue(0);
+ }
+ }
+
+ if (level != null && level.paperConfig.hideItemmetaFromClients) {
+ // Some resource packs show different textures when there is more than one item. Since this shouldn't provide a big advantage,
+ // we'll tell the client if there's one or (more than) two items.
+ itemStack.setCount(itemStack.getCount() > 1 ? 2 : 1);
+ // We can't just strip out display, leather helmets still use the display.color tag.
+ if (nbt.get("display") instanceof CompoundTag displayTag) {
+ displayTag.remove("Lore");
+ displayTag.remove("Name");
+ }
+
+ if (nbt.get("Enchantments") instanceof ListTag enchantmentsTag && !enchantmentsTag.isEmpty()) {
+ // The client still renders items with the enchantment glow if the enchantments tag contains at least one (empty) child.
+ ListTag enchantments = new ListTag();
+ enchantments.add(new CompoundTag());
+ nbt.put("Enchantments", enchantments);
+ }
+ nbt.remove("AttributeModifiers");
+ }
+ // Always remove items to prevent oversized data
+ // Bundles change their texture based on their fullness.
+ if (itemStack.is(Items.BUNDLE) && nbt.get("Items") instanceof ListTag oldItems && !oldItems.isEmpty()) {
+ org.bukkit.inventory.meta.BundleMeta bundleMeta = (org.bukkit.inventory.meta.BundleMeta) itemStack.asBukkitMirror().getItemMeta();
+ int sizeUsed = 0;
+ for (org.bukkit.inventory.ItemStack item : bundleMeta.getItems()) {
+ int scale = 64 / item.getMaxStackSize();
+ sizeUsed += scale * item.getAmount();
+ }
+ // Now we add a single fake item that uses the same amount of slots as all other items.
+ ListTag items = new ListTag();
+ items.add(new ItemStack(Items.PAPER, sizeUsed).save(new CompoundTag()));
+ nbt.put("Items", items);
+ }
+ nbt.remove("BlockEntityTag");
+ nbt.remove("EntityTag");
+ }
+ }
+
private void handleEquipmentChanges(Map<EquipmentSlot, ItemStack> equipmentChanges) {
List<Pair<EquipmentSlot, ItemStack>> list = Lists.newArrayListWithCapacity(equipmentChanges.size());
equipmentChanges.forEach((enumitemslot, itemstack) -> {
ItemStack itemstack1 = itemstack.copy();
+ stripMeta(itemstack1, this.level); // Paper - hide unnecessary itemmeta from clients
list.add(Pair.of(enumitemslot, itemstack1));
switch (enumitemslot.getType()) {