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/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java index 409cffcf74b32beba09b2fe800d1329ee64426f8..99008ac6943c56f74f912e739709a4724da322ef 100644 --- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java +++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java @@ -985,6 +985,13 @@ public class PaperWorldConfig { behaviorTickRates = loadTickRates("behavior"); } + public boolean hideItemmetaFromClients = false; + 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 loadTickRates(String type) { log(" " + type + ":"); com.google.common.collect.Table table = com.google.common.collect.HashBasedTable.create(); diff --git a/src/main/java/net/minecraft/server/level/ServerEntity.java b/src/main/java/net/minecraft/server/level/ServerEntity.java index 5d30612fbb5e9edc7301b3bae31c1764fc6630c6..a482cc1c4d7eab531cd3f5cf42f7d3a43470ef6b 100644 --- a/src/main/java/net/minecraft/server/level/ServerEntity.java +++ b/src/main/java/net/minecraft/server/level/ServerEntity.java @@ -305,7 +305,7 @@ 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/world/entity/LivingEntity.java b/src/main/java/net/minecraft/world/entity/LivingEntity.java index 522d4ca03bf539dcb38ddf8cf97a1627a7698bc3..7bd5c41c08d198c4278486a245872d2f31162627 100644 --- a/src/main/java/net/minecraft/world/entity/LivingEntity.java +++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java @@ -3111,7 +3111,7 @@ 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: @@ -3125,6 +3125,59 @@ 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.hideDurabilityFromClients) { + // 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.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. + 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()) {