Mirror von
https://github.com/PaperMC/Paper.git
synchronisiert 2024-12-16 03:20:07 +01:00
89d51d5f29
Because this exploit has been widely known for years and has not been fixed by Mojang, we decided that it was worth allowing people to toggle it on/off due to how easy it is to make it configurable. It should be noted that this decision does not promise all future exploits will be configurable.
151 Zeilen
6.9 KiB
Diff
151 Zeilen
6.9 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Jake Potrebic <jake.m.potrebic@gmail.com>
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Date: Fri, 20 Aug 2021 13:03:21 -0700
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Subject: [PATCH] Get entity default attributes
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== AT ==
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public net.minecraft.world.entity.ai.attributes.AttributeSupplier getAttributeInstance(Lnet/minecraft/world/entity/ai/attributes/Attribute;)Lnet/minecraft/world/entity/ai/attributes/AttributeInstance;
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diff --git a/src/main/java/io/papermc/paper/attribute/UnmodifiableAttributeInstance.java b/src/main/java/io/papermc/paper/attribute/UnmodifiableAttributeInstance.java
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new file mode 100644
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index 0000000000000000000000000000000000000000..12135ffeacd648f6bc4d7d327059ea1a7e8c79c4
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--- /dev/null
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+++ b/src/main/java/io/papermc/paper/attribute/UnmodifiableAttributeInstance.java
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@@ -0,0 +1,30 @@
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+package io.papermc.paper.attribute;
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+
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+import net.minecraft.world.entity.ai.attributes.AttributeInstance;
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+import org.bukkit.attribute.Attribute;
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+import org.bukkit.attribute.AttributeModifier;
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+import org.bukkit.craftbukkit.attribute.CraftAttributeInstance;
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+
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+import java.util.Collection;
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+
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+public class UnmodifiableAttributeInstance extends CraftAttributeInstance {
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+
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+ public UnmodifiableAttributeInstance(AttributeInstance handle, Attribute attribute) {
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+ super(handle, attribute);
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+ }
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+
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+ @Override
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+ public void setBaseValue(double d) {
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+ throw new UnsupportedOperationException("Cannot modify default attributes");
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+ }
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+
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+ @Override
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+ public void addModifier(AttributeModifier modifier) {
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+ throw new UnsupportedOperationException("Cannot modify default attributes");
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+ }
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+
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+ @Override
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+ public void removeModifier(AttributeModifier modifier) {
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+ throw new UnsupportedOperationException("Cannot modify default attributes");
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+ }
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+}
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diff --git a/src/main/java/io/papermc/paper/attribute/UnmodifiableAttributeMap.java b/src/main/java/io/papermc/paper/attribute/UnmodifiableAttributeMap.java
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new file mode 100644
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index 0000000000000000000000000000000000000000..68044b8439c302114240d0ae4da93ab3e0789cd2
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--- /dev/null
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+++ b/src/main/java/io/papermc/paper/attribute/UnmodifiableAttributeMap.java
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@@ -0,0 +1,32 @@
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+package io.papermc.paper.attribute;
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+
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+import net.minecraft.world.entity.ai.attributes.AttributeSupplier;
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+import org.bukkit.attribute.Attributable;
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+import org.bukkit.attribute.Attribute;
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+import org.bukkit.attribute.AttributeInstance;
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+import org.bukkit.craftbukkit.attribute.CraftAttribute;
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+import org.jetbrains.annotations.NotNull;
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+import org.jetbrains.annotations.Nullable;
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+
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+public class UnmodifiableAttributeMap implements Attributable {
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+
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+ private final AttributeSupplier handle;
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+
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+ public UnmodifiableAttributeMap(@NotNull AttributeSupplier handle) {
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+ this.handle = handle;
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+ }
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+
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+ @Override
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+ public @Nullable AttributeInstance getAttribute(@NotNull Attribute attribute) {
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+ net.minecraft.world.entity.ai.attributes.Attribute nmsAttribute = CraftAttribute.bukkitToMinecraft(attribute);
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+ if (!this.handle.hasAttribute(nmsAttribute)) {
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+ return null;
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+ }
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+ return new UnmodifiableAttributeInstance(this.handle.getAttributeInstance(nmsAttribute), attribute);
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+ }
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+
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+ @Override
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+ public void registerAttribute(@NotNull Attribute attribute) {
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+ throw new UnsupportedOperationException("Cannot register new attributes here");
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+ }
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+}
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diff --git a/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java b/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
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index b89171cb89e3d38f3260ead8549cccde904db7c4..efa904eac6e3c2995f5a03fca44340d083e73b77 100644
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--- a/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
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+++ b/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
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@@ -576,6 +576,18 @@ public final class CraftMagicNumbers implements UnsafeValues {
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public int getProtocolVersion() {
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return net.minecraft.SharedConstants.getCurrentVersion().getProtocolVersion();
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}
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+
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+ @Override
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+ public boolean hasDefaultEntityAttributes(NamespacedKey bukkitEntityKey) {
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+ return net.minecraft.world.entity.ai.attributes.DefaultAttributes.hasSupplier(net.minecraft.core.registries.BuiltInRegistries.ENTITY_TYPE.get(CraftNamespacedKey.toMinecraft(bukkitEntityKey)));
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+ }
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+
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+ @Override
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+ public org.bukkit.attribute.Attributable getDefaultEntityAttributes(NamespacedKey bukkitEntityKey) {
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+ Preconditions.checkArgument(hasDefaultEntityAttributes(bukkitEntityKey), bukkitEntityKey + " doesn't have default attributes");
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+ var supplier = net.minecraft.world.entity.ai.attributes.DefaultAttributes.getSupplier((net.minecraft.world.entity.EntityType<? extends net.minecraft.world.entity.LivingEntity>) net.minecraft.core.registries.BuiltInRegistries.ENTITY_TYPE.get(CraftNamespacedKey.toMinecraft(bukkitEntityKey)));
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+ return new io.papermc.paper.attribute.UnmodifiableAttributeMap(supplier);
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+ }
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// Paper end
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/**
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diff --git a/src/test/java/io/papermc/paper/attribute/EntityTypeAttributesTest.java b/src/test/java/io/papermc/paper/attribute/EntityTypeAttributesTest.java
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new file mode 100644
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index 0000000000000000000000000000000000000000..e8cdfa385230d3de202122e4df5e07f61f80ce75
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--- /dev/null
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+++ b/src/test/java/io/papermc/paper/attribute/EntityTypeAttributesTest.java
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@@ -0,0 +1,39 @@
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+package io.papermc.paper.attribute;
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+
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+import org.bukkit.attribute.Attributable;
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+import org.bukkit.attribute.Attribute;
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+import org.bukkit.attribute.AttributeInstance;
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+import org.bukkit.attribute.AttributeModifier;
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+import org.bukkit.entity.EntityType;
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+import org.bukkit.support.AbstractTestingBase;
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+import org.junit.jupiter.api.Test;
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+
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+import static org.junit.jupiter.api.Assertions.assertFalse;
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+import static org.junit.jupiter.api.Assertions.assertNotNull;
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+import static org.junit.jupiter.api.Assertions.assertThrows;
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+import static org.junit.jupiter.api.Assertions.assertTrue;
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+
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+public class EntityTypeAttributesTest extends AbstractTestingBase {
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+
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+ @Test
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+ public void testIllegalEntity() {
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+ assertFalse(EntityType.EGG.hasDefaultAttributes());
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+ assertThrows(IllegalArgumentException.class, () -> EntityType.EGG.getDefaultAttributes());
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+ }
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+
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+ @Test
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+ public void testLegalEntity() {
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+ assertTrue(EntityType.ZOMBIE.hasDefaultAttributes());
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+ EntityType.ZOMBIE.getDefaultAttributes();
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+ }
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+
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+ @Test
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+ public void testUnmodifiabilityOfAttributable() {
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+ Attributable attributable = EntityType.ZOMBIE.getDefaultAttributes();
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+ assertThrows(UnsupportedOperationException.class, () -> attributable.registerAttribute(Attribute.GENERIC_ATTACK_DAMAGE));
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+ AttributeInstance instance = attributable.getAttribute(Attribute.GENERIC_FOLLOW_RANGE);
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+ assertNotNull(instance);
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+ assertThrows(UnsupportedOperationException.class, () -> instance.addModifier(new AttributeModifier("test", 3, AttributeModifier.Operation.ADD_NUMBER)));
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+ assertThrows(UnsupportedOperationException.class, () -> instance.setBaseValue(3.2));
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+ }
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+}
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