From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Noah van der Aa 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 8d2870c780c4c253f6570c7ef73f6e7c2ccc46ad..0cbb5dd17c5b37ad90ce11a31b64470722026d06 100644 --- a/src/main/java/net/minecraft/server/level/ServerEntity.java +++ b/src/main/java/net/minecraft/server/level/ServerEntity.java @@ -337,7 +337,7 @@ 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 3fb7e355a86851731f5f11b6b8bb8e4515806a33..3d2ef1728a54d7612a773dfb7066b7370c9df178 100644 --- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java +++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java @@ -2566,8 +2566,8 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl // Refresh the current entity metadata entity.getEntityData().refresh(ServerGamePacketListenerImpl.this.player); // 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 ServerGamePacketListenerImpl.this.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 3de3e938195c79c65b7e11438ca92585aaccf529..cf91a4b9d2aab2ed32d7d53e5d3bd97838b7a8a4 100644 --- a/src/main/java/net/minecraft/world/entity/LivingEntity.java +++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java @@ -3190,7 +3190,7 @@ public abstract class LivingEntity extends Entity implements Attackable { // 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: @@ -3204,6 +3204,77 @@ public abstract class LivingEntity extends Entity implements Attackable { ((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 (this.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); + } + } + + final CompoundTag tag = copy.getTag(); + if (this.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. + 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"); + tag.remove("Unbreakable"); + tag.remove("PublicBukkitValues"); // Persistent data container1 + + // Books + tag.remove("author"); + tag.remove("filtered_title"); + tag.remove("pages"); + tag.remove("filtered_pages"); + tag.remove("title"); + tag.remove("generation"); + + // Filled maps + tag.remove("map"); + tag.remove("map_scale_direction"); + tag.remove("map_to_lock"); + } + } + + if (this.level().paperConfig().anticheat.obfuscation.items.hideItemmetaWithVisualEffects && tag != null) { + // Lodestone compasses + tag.remove("LodestonePos"); + if (tag.contains("LodestoneDimension")) { + // The client shows the glint if either the position or the dimension is present, so we just wipe + // the position and fake the dimension + tag.putString("LodestoneDimension", "paper:paper"); + } + } + + return copy; + } + // Paper end + // Paper start - prevent oversized data public static ItemStack sanitizeItemStack(final ItemStack itemStack, final boolean copyItemStack) { if (itemStack.isEmpty() || !itemStack.hasTag()) {