From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Aikar Date: Sat, 25 Apr 2020 06:46:35 -0400 Subject: [PATCH] Fix item duplication 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 2ce2926f4e3a79a1a329cdd684852970f6f104f2..b1d870b9a3b414ed49b4674afc2c6088d457ebc1 100644 --- a/src/main/java/net/minecraft/world/entity/Entity.java +++ b/src/main/java/net/minecraft/world/entity/Entity.java @@ -2517,11 +2517,12 @@ public abstract class Entity implements SyncedDataHolder, Nameable, EntityAccess } 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 - copy 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 @@ -3337,6 +3338,12 @@ public abstract class Entity implements SyncedDataHolder, Nameable, EntityAccess public Entity changeDimension(DimensionTransition teleportTarget) { Level world = this.level(); + // Paper start - Fix item duplication and teleport issues + if (!this.isAlive() || !this.valid) { + LOGGER.warn("Illegal Entity Teleport " + this + " to " + teleportTarget.newLevel() + ":" + teleportTarget.pos(), new Throwable()); + return null; + } + // Paper end - Fix item duplication and teleport issues if (world instanceof ServerLevel worldserver) { if (!this.isRemoved()) { // CraftBukkit start @@ -3379,6 +3386,11 @@ public abstract class Entity implements SyncedDataHolder, Nameable, EntityAccess if (entity2 != null) { if (this != entity2) { + // Paper start - Fix item duplication and teleport issues + if (this instanceof Mob) { + ((Mob) this).dropLeash(true, true); // Paper drop lead + } + // Paper end - Fix item duplication and teleport issues entity2.restoreFrom(this); this.removeAfterChangingDimensions(); // CraftBukkit start - Forward the CraftEntity to the new entity @@ -3454,7 +3466,7 @@ public abstract class Entity implements SyncedDataHolder, Nameable, EntityAccess } public boolean canChangeDimensions(Level from, Level to) { - return true; + return this.isAlive() && this.valid; // Paper - Fix item duplication and teleport issues } 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 d475a0f36a7c302fc5cf23ab2ad6d0b835710abb..96894dba3ddbf1d52266e5df0c280cc30d54d5de 100644 --- a/src/main/java/net/minecraft/world/entity/LivingEntity.java +++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java @@ -1717,9 +1717,9 @@ public abstract class LivingEntity extends Entity implements Attackable { // Paper start org.bukkit.event.entity.EntityDeathEvent deathEvent = this.dropAllDeathLoot(worldserver, damageSource); if (deathEvent == null || !deathEvent.isCancelled()) { - if (this.deathScore >= 0 && entityliving != null) { - entityliving.awardKillScore(this, this.deathScore, damageSource); - } + // if (this.deathScore >= 0 && entityliving != null) { // Paper - Fix item duplication and teleport issues; moved to be run earlier in #dropAllDeathLoot before destroying the drop items in CraftEventFactory#callEntityDeathEvent + // entityliving.awardKillScore(this, this.deathScore, damageSource); + // } // Paper start - clear equipment if event is not cancelled if (this instanceof Mob) { for (EquipmentSlot slot : this.clearedEquipmentSlots) { @@ -1811,8 +1811,13 @@ public abstract class LivingEntity extends Entity implements Attackable { this.dropCustomDeathLoot(world, damageSource, flag); this.clearEquipmentSlots = prev; // Paper } - // CraftBukkit start - Call death event - org.bukkit.event.entity.EntityDeathEvent deathEvent = CraftEventFactory.callEntityDeathEvent(this, damageSource, 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, damageSource, this.drops, () -> { + final LivingEntity entityliving = this.getKillCredit(); + if (this.deathScore >= 0 && entityliving != null) { + entityliving.awardKillScore(this, this.deathScore, damageSource); + } + }); // 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 92bb0c63330ad3a4cb13b2dc655020714e9b1ffd..cc1189c2d7dc57ba8f29aad4ba5d2a07362bcd5b 100644 --- a/src/main/java/net/minecraft/world/entity/decoration/ArmorStand.java +++ b/src/main/java/net/minecraft/world/entity/decoration/ArmorStand.java @@ -635,7 +635,7 @@ public class ArmorStand extends LivingEntity { for (i = 0; i < this.handItems.size(); ++i) { itemstack = (ItemStack) this.handItems.get(i); if (!itemstack.isEmpty()) { - this.drops.add(org.bukkit.craftbukkit.inventory.CraftItemStack.asBukkitCopy(itemstack)); // CraftBukkit - add to drops + this.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); } } @@ -643,7 +643,7 @@ public class ArmorStand extends LivingEntity { for (i = 0; i < this.armorItems.size(); ++i) { itemstack = (ItemStack) this.armorItems.get(i); if (!itemstack.isEmpty()) { - this.drops.add(org.bukkit.craftbukkit.inventory.CraftItemStack.asBukkitCopy(itemstack)); // CraftBukkit - add to drops + this.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 6e9f0fdbfffe7a08185a125e2ad0f2227d25cc07..720ea811407b4288b9923cf7db0ac44ad1a086e0 100644 --- a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java +++ b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java @@ -895,6 +895,11 @@ public class CraftEventFactory { } public static EntityDeathEvent callEntityDeathEvent(net.minecraft.world.entity.LivingEntity victim, DamageSource damageSource, List drops) { + // Paper start + return CraftEventFactory.callEntityDeathEvent(victim, damageSource, drops, com.google.common.util.concurrent.Runnables.doNothing()); + } + public static EntityDeathEvent callEntityDeathEvent(net.minecraft.world.entity.LivingEntity victim, DamageSource damageSource, List drops, Runnable lootCheck) { + // Paper end CraftLivingEntity entity = (CraftLivingEntity) victim.getBukkitEntity(); CraftDamageSource bukkitDamageSource = new CraftDamageSource(damageSource); EntityDeathEvent event = new EntityDeathEvent(entity, bukkitDamageSource, drops, victim.getExpReward(damageSource.getEntity())); @@ -909,11 +914,13 @@ 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;