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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/net/minecraft/server/level/ServerEntity.java b/src/main/java/net/minecraft/server/level/ServerEntity.java
index 319dfa82dff1fe188a52bed5aa2d39575853b793..919758363c7b703cb200582768e68c97ce5c807a 100644
--- a/src/main/java/net/minecraft/server/level/ServerEntity.java
+++ b/src/main/java/net/minecraft/server/level/ServerEntity.java
@@ -311,7 +311,7 @@ public class ServerEntity {
if (!itemstack.isEmpty()) {
// Paper start - prevent oversized data
final ItemStack sanitized = LivingEntity.sanitizeItemStack(itemstack.copy(), false);
- list.add(Pair.of(enumitemslot, sanitized));
+ list.add(Pair.of(enumitemslot, ((LivingEntity) this.entity).stripMeta(sanitized, false))); // Paper - remove unnecessary item meta
// Paper end
}
}
diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
index 678c0b1c37b16e405205933a16f0d2d29359fd12..1d024bfbada440c93b1174568feaa67544f7f0d2 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -2816,8 +2816,8 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Tic
}
// Paper end
// SPIGOT-7136 - Allays
- if (entity instanceof Allay) {
- ServerGamePacketListenerImpl.this.send(new ClientboundSetEquipmentPacket(entity.getId(), Arrays.stream(net.minecraft.world.entity.EquipmentSlot.values()).map((slot) -> Pair.of(slot, ((LivingEntity) entity).getItemBySlot(slot).copy())).collect(Collectors.toList())));
+ if (entity instanceof Allay allay) { // Paper
+ ServerGamePacketListenerImpl.this.send(new ClientboundSetEquipmentPacket(entity.getId(), Arrays.stream(net.minecraft.world.entity.EquipmentSlot.values()).map((slot) -> Pair.of(slot, allay.stripMeta(allay.getItemBySlot(slot), true))).collect(Collectors.toList()))); // Paper - remove unnecessary item meta
player.containerMenu.sendAllDataToRemote();
}
}
diff --git a/src/main/java/net/minecraft/world/entity/LivingEntity.java b/src/main/java/net/minecraft/world/entity/LivingEntity.java
index e7560eb298b563231407de832a81bb2c97e3c4cf..d6ecdeab398d7bfde3d760ada0374245f03014b3 100644
--- a/src/main/java/net/minecraft/world/entity/LivingEntity.java
+++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java
@@ -3136,7 +3136,7 @@ public abstract class LivingEntity extends Entity {
// Paper start - prevent oversized data
ItemStack toSend = sanitizeItemStack(itemstack1, true);
- list.add(Pair.of(enumitemslot, toSend));
+ list.add(Pair.of(enumitemslot, stripMeta(toSend, toSend == itemstack1))); // Paper - hide unnecessary item meta
// Paper end
switch (enumitemslot.getType()) {
case HAND:
@@ -3150,6 +3150,59 @@ public abstract class LivingEntity extends Entity {
((ServerLevel) this.level).getChunkSource().broadcast(this, new ClientboundSetEquipmentPacket(this.getId(), list));
}
+ // Paper start - hide unnecessary item meta
+ public ItemStack stripMeta(final ItemStack itemStack, final boolean copyItemStack) {
+ if (itemStack.isEmpty() || (!itemStack.hasTag() && itemStack.getCount() < 2)) {
+ return itemStack;
+ }
+
+ final ItemStack copy = copyItemStack ? itemStack.copy() : itemStack;
+ if (level.paperConfig().anticheat.obfuscation.items.hideDurability) {
+ // Only show damage values for elytra's, since they show a different texture when broken.
+ if (!copy.is(Items.ELYTRA) || copy.getDamageValue() < copy.getMaxDamage() - 1) {
+ copy.setDamageValue(0);
+ }
+ }
+
+ if (level.paperConfig().anticheat.obfuscation.items.hideItemmeta) {
+ // 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.
+ copy.setCount(copy.getCount() > 1 ? 2 : 1);
+ // We can't just strip out display, leather helmets still use the display.color tag.
+ final CompoundTag tag = copy.getTag();
+ if (tag != null) {
+ if (tag.get("display") instanceof CompoundTag displayTag) {
+ displayTag.remove("Lore");
+ displayTag.remove("Name");
+ }
+
+ if (tag.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();
+ CompoundTag fakeEnchantment = new CompoundTag();
+ // Soul speed boots generate client side particles.
+ if (EnchantmentHelper.getItemEnchantmentLevel(Enchantments.SOUL_SPEED, itemStack) > 0) {
+ fakeEnchantment.putString("id", org.bukkit.enchantments.Enchantment.SOUL_SPEED.getKey().asString());
+ fakeEnchantment.putInt("lvl", 1);
+ }
+ enchantments.add(fakeEnchantment);
+ tag.put("Enchantments", enchantments);
+ }
+ tag.remove("AttributeModifiers");
+
+ // Books
+ tag.remove("author");
+ tag.remove("filtered_title");
+ tag.remove("pages");
+ tag.remove("filtered_pages");
+ tag.remove("title");
+ tag.remove("generation");
+ }
+ }
+ return copy;
+ }
+ // Paper end
+
// Paper start - prevent oversized data
public static ItemStack sanitizeItemStack(final ItemStack itemStack, final boolean copyItemStack) {
if (itemStack.isEmpty() || !itemStack.hasTag()) {
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