From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Aikar 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 d387e8cc95f9f54dfbf018d4e52cde5087bfc209..f69bc9d81750feb108119347f984de6bca24ae44 100644 --- a/src/main/java/net/minecraft/world/entity/Entity.java +++ b/src/main/java/net/minecraft/world/entity/Entity.java @@ -2141,11 +2141,12 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource { } 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 @@ -2910,6 +2911,12 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource { @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 @@ -2936,6 +2943,11 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource { // 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) { @@ -2949,10 +2961,6 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource { // 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 } @@ -3074,7 +3082,7 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource { } 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 960f56019313977b336cf0de9495aae8e1dc976a..2b63a1cac397d80103b172477a0f3933e030e9a3 100644 --- a/src/main/java/net/minecraft/world/entity/LivingEntity.java +++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java @@ -1622,9 +1622,9 @@ 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) { for (EquipmentSlot slot : this.clearedEquipmentSlots) { @@ -1721,8 +1721,13 @@ 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 - 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 27733f7737945b400d31b432178d792d0b79977d..1e16264b533c2205098c0569fadb8e369a032764 100644 --- a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java +++ b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java @@ -818,6 +818,11 @@ public class CraftEventFactory { } public static EntityDeathEvent callEntityDeathEvent(net.minecraft.world.entity.LivingEntity victim, List 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 drops, Runnable lootCheck) { + // Paper end CraftLivingEntity entity = (CraftLivingEntity) victim.getBukkitEntity(); EntityDeathEvent event = new EntityDeathEvent(entity, drops, victim.getExpReward()); populateFields(victim, event); // Paper - make cancellable @@ -831,11 +836,13 @@ 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;