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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Sat, 25 Apr 2020 06:46:35 -0400
Subject: [PATCH] Fix numerous item duplication issues and teleport issues
This notably fixes the newest "Donkey Dupe", but also fixes a lot
of dupe bugs in general around nether portals and entity world transfer
We also fix item duplication generically by anytime we clone an item
to drop it on the ground, destroy the source item.
This avoid an itemstack ever existing twice in the world state pre
clean up stage.
So even if something NEW comes up, it would be impossible to drop the
same item twice because the source was destroyed.
diff --git a/src/main/java/net/minecraft/world/entity/Entity.java b/src/main/java/net/minecraft/world/entity/Entity.java
index de4e47ced31b0711eda98c1cf53c80950a730143..326d00f9889cdca2e5af3ca7f7964cd7b43b3411 100644
--- a/src/main/java/net/minecraft/world/entity/Entity.java
+++ b/src/main/java/net/minecraft/world/entity/Entity.java
@@ -2159,11 +2159,12 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, n
} else {
// CraftBukkit start - Capture drops for death event
if (this instanceof net.minecraft.world.entity.LivingEntity && !((net.minecraft.world.entity.LivingEntity) this).forceDrops) {
- ((net.minecraft.world.entity.LivingEntity) this).drops.add(org.bukkit.craftbukkit.inventory.CraftItemStack.asBukkitCopy(stack));
+ ((net.minecraft.world.entity.LivingEntity) this).drops.add(org.bukkit.craftbukkit.inventory.CraftItemStack.asCraftMirror(stack)); // Paper - mirror so we can destroy it later
return null;
}
// CraftBukkit end
- ItemEntity entityitem = new ItemEntity(this.level, this.getX(), this.getY() + (double) yOffset, this.getZ(), stack);
+ ItemEntity entityitem = new ItemEntity(this.level, this.getX(), this.getY() + (double) yOffset, this.getZ(), stack.copy()); // Paper - clone so we can destroy original
+ stack.setCount(0); // Paper - destroy this item - if this ever leaks due to game bugs, ensure it doesn't dupe
entityitem.setDefaultPickUpDelay();
// CraftBukkit start
@@ -2905,6 +2906,12 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, n
@Nullable
public Entity teleportTo(ServerLevel worldserver, BlockPos location) {
// CraftBukkit end
+ // Paper start - fix bad state entities causing dupes
+ if (!isAlive() || !valid) {
+ LOGGER.warn("Illegal Entity Teleport " + this + " to " + worldserver + ":" + location, new Throwable());
+ return null;
+ }
+ // Paper end
if (this.level instanceof ServerLevel && !this.isRemoved()) {
this.level.getProfiler().push("changeDimension");
// CraftBukkit start
@@ -2925,6 +2932,11 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, n
// CraftBukkit end
this.level.getProfiler().popPush("reloading");
+ // Paper start - Change lead drop timing to prevent dupe
+ if (this instanceof Mob) {
+ ((Mob) this).dropLeash(true, true); // Paper drop lead
+ }
+ // Paper end
Entity entity = this.getType().create((Level) worldserver);
if (entity != null) {
@@ -2938,10 +2950,6 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, n
// CraftBukkit start - Forward the CraftEntity to the new entity
this.getBukkitEntity().setHandle(entity);
entity.bukkitEntity = this.getBukkitEntity();
-
- if (this instanceof Mob) {
- ((Mob) this).dropLeash(true, false); // Unleash to prevent duping of leads.
- }
// CraftBukkit end
}
@@ -3066,7 +3074,7 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, n
}
public boolean canChangeDimensions() {
- return true;
+ return isAlive() && valid; // Paper
}
public float getBlockExplosionResistance(Explosion explosion, BlockGetter world, BlockPos pos, BlockState blockState, FluidState fluidState, float max) {
diff --git a/src/main/java/net/minecraft/world/entity/LivingEntity.java b/src/main/java/net/minecraft/world/entity/LivingEntity.java
index 4755bfe5f49a8d110dfbb20d241c8496a14b0703..9c6ed2b6384edf8d507ec70852ea65d988528be6 100644
--- a/src/main/java/net/minecraft/world/entity/LivingEntity.java
+++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java
@@ -1626,9 +1626,9 @@ public abstract class LivingEntity extends Entity {
// Paper start
org.bukkit.event.entity.EntityDeathEvent deathEvent = this.dropAllDeathLoot(source);
if (deathEvent == null || !deathEvent.isCancelled()) {
- if (this.deathScore >= 0 && entityliving != null) {
- entityliving.awardKillScore(this, this.deathScore, source);
- }
+ // if (this.deathScore >= 0 && entityliving != null) { // Paper - moved to be run earlier in #dropAllDeathLoot before destroying the drop items in CraftEventFactory#callEntityDeathEvent
+ // entityliving.awardKillScore(this, this.deathScore, source);
+ // }
if (this instanceof Mob) { // Clear equipment slots marked as cleared
for (EquipmentSlot slot : this.clearedEquipmentSlots) {
this.setItemSlot(slot, ItemStack.EMPTY);
@@ -1723,8 +1723,14 @@ public abstract class LivingEntity extends Entity {
this.dropCustomDeathLoot(source, i, flag);
this.clearEquipmentSlots = prev; // Paper
}
- // CraftBukkit start - Call death event
- org.bukkit.event.entity.EntityDeathEvent deathEvent = CraftEventFactory.callEntityDeathEvent(this, this.drops); // Paper
+ // CraftBukkit start - Call death event // Paper start - run advancement triggers before destroying drop itemstacks
+ org.bukkit.event.entity.EntityDeathEvent deathEvent = CraftEventFactory.callEntityDeathEvent(this, this.drops, () -> {
+ final LivingEntity entityliving = this.getKillCredit();
+ if (this.deathScore >= 0 && entityliving != null) {
+ entityliving.awardKillScore(this, this.deathScore, source);
+ }
+ });
+ // Paper end
this.postDeathDropItems(deathEvent); // Paper
this.drops = new ArrayList<>();
// CraftBukkit end
diff --git a/src/main/java/net/minecraft/world/entity/decoration/ArmorStand.java b/src/main/java/net/minecraft/world/entity/decoration/ArmorStand.java
index b41e6fb0b7e02b50e5ad05555ed911d09055d694..c5e9273055ff7302941b7475d8175be53eaece1f 100644
--- a/src/main/java/net/minecraft/world/entity/decoration/ArmorStand.java
+++ b/src/main/java/net/minecraft/world/entity/decoration/ArmorStand.java
@@ -611,7 +611,7 @@ public class ArmorStand extends LivingEntity {
for (i = 0; i < this.handItems.size(); ++i) {
itemstack = (ItemStack) this.handItems.get(i);
if (!itemstack.isEmpty()) {
- drops.add(org.bukkit.craftbukkit.inventory.CraftItemStack.asBukkitCopy(itemstack)); // CraftBukkit - add to drops
+ drops.add(org.bukkit.craftbukkit.inventory.CraftItemStack.asCraftMirror(itemstack)); // CraftBukkit - add to drops // Paper - mirror so we can destroy it later - though this call site was safe
this.handItems.set(i, ItemStack.EMPTY);
}
}
@@ -619,7 +619,7 @@ public class ArmorStand extends LivingEntity {
for (i = 0; i < this.armorItems.size(); ++i) {
itemstack = (ItemStack) this.armorItems.get(i);
if (!itemstack.isEmpty()) {
- drops.add(org.bukkit.craftbukkit.inventory.CraftItemStack.asBukkitCopy(itemstack)); // CraftBukkit - add to drops
+ drops.add(org.bukkit.craftbukkit.inventory.CraftItemStack.asCraftMirror(itemstack)); // CraftBukkit - add to drops // Paper - mirror so we can destroy it later - though this call site was safe
this.armorItems.set(i, ItemStack.EMPTY);
}
}
diff --git a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
index bf7c61c767bdfe8ddb63367f1b38dbbeba17ba02..4533988489fa2af009ffab95314a2a34344d0b87 100644
--- a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
+++ b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
@@ -810,6 +810,11 @@ public class CraftEventFactory {
}
public static EntityDeathEvent callEntityDeathEvent(net.minecraft.world.entity.LivingEntity victim, List<org.bukkit.inventory.ItemStack> drops) {
+ // Paper start
+ return CraftEventFactory.callEntityDeathEvent(victim, drops, com.google.common.util.concurrent.Runnables.doNothing());
+ }
+ public static EntityDeathEvent callEntityDeathEvent(net.minecraft.world.entity.LivingEntity victim, List<org.bukkit.inventory.ItemStack> drops, Runnable lootCheck) {
+ // Paper end
CraftLivingEntity entity = (CraftLivingEntity) victim.getBukkitEntity();
EntityDeathEvent event = new EntityDeathEvent(entity, drops, victim.getExpReward());
populateFields(victim, event); // Paper - make cancellable
@@ -823,11 +828,13 @@ public class CraftEventFactory {
playDeathSound(victim, event);
// Paper end
victim.expToDrop = event.getDroppedExp();
+ lootCheck.run(); // Paper - run advancement triggers before destroying the equipment stacks below
for (org.bukkit.inventory.ItemStack stack : event.getDrops()) {
if (stack == null || stack.getType() == Material.AIR || stack.getAmount() == 0) continue;
- world.dropItem(entity.getLocation(), stack);
+ world.dropItem(entity.getLocation(), stack); // Paper - note: dropItem already clones due to this being bukkit -> NMS
+ if (stack instanceof CraftItemStack) stack.setAmount(0); // Paper - destroy this item - if this ever leaks due to game bugs, ensure it doesn't dupe, but don't nuke bukkit stacks of manually added items
}
return event;
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