172 Zeilen
9.8 KiB
Diff
172 Zeilen
9.8 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Noah van der Aa <ndvdaa@gmail.com>
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Date: Tue, 3 Aug 2021 17:28:27 +0200
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Subject: [PATCH] Hide unnecessary itemmeta from clients
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TODO: Needs updating for data components
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diff --git a/src/main/java/io/papermc/paper/util/ItemStackObfuscator.java b/src/main/java/io/papermc/paper/util/ItemStackObfuscator.java
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new file mode 100644
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index 0000000000000000000000000000000000000000..12156aa7305fa26e34ee74eacd490fd9b97a7a7f
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--- /dev/null
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+++ b/src/main/java/io/papermc/paper/util/ItemStackObfuscator.java
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@@ -0,0 +1,111 @@
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+package io.papermc.paper.util;
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+
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+import net.minecraft.core.component.DataComponentMap;
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+import net.minecraft.core.component.DataComponents;
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+import net.minecraft.nbt.CompoundTag;
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+import net.minecraft.nbt.ListTag;
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+import net.minecraft.world.item.ItemStack;
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+import net.minecraft.world.item.Items;
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+import net.minecraft.world.item.component.BundleContents;
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+import net.minecraft.world.item.component.CustomData;
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+import net.minecraft.world.item.enchantment.EnchantmentHelper;
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+import net.minecraft.world.item.enchantment.Enchantments;
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+import net.minecraft.world.item.enchantment.ItemEnchantments;
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+import net.minecraft.world.level.Level;
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+import java.util.List;
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+
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+public class ItemStackObfuscator {
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+
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+ // Paper start - Hide unnecessary item meta
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+ public static ItemStack stripMeta(final ItemStack itemStack, final boolean copyItemStack, Level level) {
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+ if (itemStack.isEmpty() || (itemStack.getComponentsPatch().isEmpty() && itemStack.getCount() < 2)) {
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+ return itemStack;
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+ }
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+
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+ final ItemStack copy = copyItemStack ? itemStack.copy() : itemStack;
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+ if (level.paperConfig().anticheat.obfuscation.items.hideDurability) {
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+ // Only show damage values for elytra's, since they show a different texture when broken.
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+ if (!copy.is(Items.ELYTRA) || copy.getDamageValue() < copy.getMaxDamage() - 1) {
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+ copy.setDamageValue(0);
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+ }
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+ }
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+
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+ final DataComponentMap components = copy.getComponents();
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+ if (level.paperConfig().anticheat.obfuscation.items.hideItemmeta) {
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+ // Some resource packs show different textures when there is more than one item. Since this shouldn't provide a big advantage,
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+ // we'll tell the client if there's one or (more than) two items.
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+ copy.setCount(copy.getCount() > 1 ? 2 : 1);
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+
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+ // We can't just strip out display, leather helmets still use the display.color tag.
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+ copy.remove(DataComponents.CUSTOM_NAME);
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+ copy.remove(DataComponents.ITEM_NAME);
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+ copy.remove(DataComponents.LORE);
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+ copy.remove(DataComponents.RARITY); // affects name only
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+
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+
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+ ItemEnchantments enchantments = copy.getEnchantments();
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+ if (!enchantments.isEmpty()) {
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+ ItemEnchantments.Mutable mutableEnchantments = new ItemEnchantments.Mutable(ItemEnchantments.EMPTY);
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+ if (EnchantmentHelper.getItemEnchantmentLevel(Enchantments.SOUL_SPEED, itemStack) > 0) {
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+ mutableEnchantments.set(Enchantments.SOUL_SPEED, 1);
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+ }
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+ if (mutableEnchantments.keySet().isEmpty()) {
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+ copy.set(DataComponents.ENCHANTMENT_GLINT_OVERRIDE, true); // Add a glint override if there are no enchantments present-- this is so we still get a fake glow
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+ }
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+
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+ copy.set(DataComponents.ENCHANTMENTS, mutableEnchantments.toImmutable());
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+ }
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+ copy.remove(DataComponents.ATTRIBUTE_MODIFIERS);
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+ copy.remove(DataComponents.UNBREAKABLE);
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+ copy.remove(DataComponents.CUSTOM_DATA); // Persistent data container (remove everything)
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+
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+ // Books
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+ copy.remove(DataComponents.WRITABLE_BOOK_CONTENT);
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+ copy.remove(DataComponents.WRITTEN_BOOK_CONTENT);
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+
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+ // Filled maps
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+ copy.remove(DataComponents.MAP_ID);
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+ copy.remove(DataComponents.MAP_POST_PROCESSING);
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+ }
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+
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+ if (level.paperConfig().anticheat.obfuscation.items.hideItemmetaWithVisualEffects) {
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+ // Lodestone compasses
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+ copy.remove(DataComponents.LODESTONE_TRACKER);
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+ copy.set(DataComponents.ENCHANTMENT_GLINT_OVERRIDE, true); // override the glint -- simulate
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+ }
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+
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+ return copy;
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+ }
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+ // Paper end - Hide unnecessary item meta
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+ // Paper start - prevent oversized data
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+ public static ItemStack sanitizeItemStack(final ItemStack itemStack, final boolean copyItemStack) {
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+ if (itemStack.isEmpty() || itemStack.getComponentsPatch().isEmpty()) {
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+ return itemStack;
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+ }
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+
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+ final ItemStack copy = copyItemStack ? itemStack.copy() : itemStack;
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+ final DataComponentMap components = copy.getComponents();
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+
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+ final BundleContents contents = components.get(DataComponents.BUNDLE_CONTENTS);
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+ if (copy.is(Items.BUNDLE) && contents != null && !contents.isEmpty()) {
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+ // Bundles change their texture based on their fullness.
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+ // TODO: Check this
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+ int sizeUsed = 0;
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+ for (ItemStack item : contents.items()) {
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+ int scale = 64 / item.getMaxStackSize();
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+ sizeUsed += scale * item.getCount();
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+ }
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+ // Now we add a single fake item that uses the same amount of slots as all other items.
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+ copy.set(DataComponents.BUNDLE_CONTENTS, new BundleContents(List.of(new ItemStack(Items.PAPER, sizeUsed))));
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+ }
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+
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+
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+ CustomData blockEntityData = components.get(DataComponents.BLOCK_ENTITY_DATA);
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+ copy.set(DataComponents.BLOCK_ENTITY_DATA, blockEntityData.update((tag) -> {
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+ tag.remove("Items");
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+ }));
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+
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+ return copy;
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+ }
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+ // Paper end - prevent oversized data
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+}
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diff --git a/src/main/java/net/minecraft/server/level/ServerEntity.java b/src/main/java/net/minecraft/server/level/ServerEntity.java
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index 4f103f731623a8570238a6867fda1c5f83fca4e4..332972fae1b1760328dd50d0b4fcb072003adaeb 100644
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--- a/src/main/java/net/minecraft/server/level/ServerEntity.java
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+++ b/src/main/java/net/minecraft/server/level/ServerEntity.java
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@@ -348,7 +348,10 @@ public class ServerEntity {
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ItemStack itemstack = ((LivingEntity) this.entity).getItemBySlot(enumitemslot);
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if (!itemstack.isEmpty()) {
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- list.add(Pair.of(enumitemslot, itemstack.copy()));
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+ // Paper start - prevent oversized data
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+ final ItemStack sanitized = io.papermc.paper.util.ItemStackObfuscator.sanitizeItemStack(itemstack.copy(), false);
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+ list.add(Pair.of(enumitemslot, io.papermc.paper.util.ItemStackObfuscator.stripMeta(sanitized, false, this.level))); // Paper - Hide unnecessary item meta
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+ // Paper end - prevent oversized data
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}
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}
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diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
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index a771f78f63e4f26c0ba411a3c355f8dfbb5f4a61..fb870aec24d83ddf1f696f7834b3037e2f30b84c 100644
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--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
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+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
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@@ -2808,8 +2808,8 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
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// Refresh the current entity metadata
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entity.refreshEntityData(ServerGamePacketListenerImpl.this.player);
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// SPIGOT-7136 - Allays
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- if (entity instanceof Allay) {
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- 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())));
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+ if (entity instanceof Allay allay) { // Paper - Hide unnecessary item meta
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+ ServerGamePacketListenerImpl.this.send(new ClientboundSetEquipmentPacket(entity.getId(), Arrays.stream(net.minecraft.world.entity.EquipmentSlot.values()).map((slot) -> Pair.of(slot, io.papermc.paper.util.ItemStackObfuscator.stripMeta(allay.getItemBySlot(slot), true, allay.level()))).collect(Collectors.toList()))); // Paper - Hide unnecessary item meta
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ServerGamePacketListenerImpl.this.player.containerMenu.sendAllDataToRemote();
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}
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}
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diff --git a/src/main/java/net/minecraft/world/entity/LivingEntity.java b/src/main/java/net/minecraft/world/entity/LivingEntity.java
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index 1ba83df3c2717dbd027b02d4d69e50091977d35f..716ce0ee330dd96effc8ca5642090ecd022d3304 100644
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--- a/src/main/java/net/minecraft/world/entity/LivingEntity.java
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+++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java
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@@ -3299,7 +3299,10 @@ public abstract class LivingEntity extends Entity implements Attackable {
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equipmentChanges.forEach((enumitemslot, itemstack) -> {
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ItemStack itemstack1 = itemstack.copy();
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- list.add(Pair.of(enumitemslot, itemstack1));
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+ // Paper start - prevent oversized data
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+ ItemStack toSend = io.papermc.paper.util.ItemStackObfuscator.sanitizeItemStack(itemstack1, true);
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+ list.add(Pair.of(enumitemslot, io.papermc.paper.util.ItemStackObfuscator.stripMeta(toSend, toSend == itemstack1, this.level()))); // Paper - Hide unnecessary item meta
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+ // Paper end - prevent oversized data
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switch (enumitemslot.getType()) {
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case HAND:
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this.setLastHandItem(enumitemslot, itemstack1);
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