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Paper/patches/server/0410-Fix-numerous-item-duplication-issues-and-teleport-is.patch

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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 c8fb6387fb3ac2849a399b2ab1f30158aa734827..a02eb37845e0609ddf14a4214395e00443534b08 100644
--- a/src/main/java/net/minecraft/world/entity/Entity.java
+++ b/src/main/java/net/minecraft/world/entity/Entity.java
@@ -2162,11 +2162,12 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, i
} 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
@@ -2919,6 +2920,12 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, i
@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
@@ -2939,6 +2946,11 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, i
// 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(worldserver);
if (entity != null) {
@@ -2952,10 +2964,6 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, i
// 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
}
@@ -3077,7 +3085,7 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, i
}
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 ab02e0babf6289d64b44dc18f3f6f0bdd4b83c32..198a0cfb222f40e792a9723eb25c514889ffe01f 100644
--- a/src/main/java/net/minecraft/world/entity/LivingEntity.java
+++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java
@@ -1619,9 +1619,9 @@ 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);
+ // }
// Paper start - clear equipment if event is not cancelled
if (this instanceof Mob mob) {
java.util.Collections.fill(mob.handItems, ItemStack.EMPTY);
@@ -1709,8 +1709,13 @@ public abstract class LivingEntity extends Entity {
this.dropCustomDeathLoot(source, i, flag);
this.clearEquipmentSlots = true; // 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 - call advancement triggers with correct entity equipment
+ 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 a3a900d10440ed5ebe24370a77ccb6cad911cfc9..0d468631b9c260091e732925da43c177ebda892f 100644
--- a/src/main/java/net/minecraft/world/entity/decoration/ArmorStand.java
+++ b/src/main/java/net/minecraft/world/entity/decoration/ArmorStand.java
@@ -610,7 +610,7 @@ 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);
}
}
@@ -618,7 +618,7 @@ 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 b7129aef8b08e8bd33f9f276bc2f97bbe8f5c894..624ed3d956a5614b723d32c6ad047248c5f5b038 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 - advancement triggers before destroying items
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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