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 5b8e264098f1b713de15f714bae59d3efda365cf..4faba83eb73e0d313e9131794962b727f7628a50 100644 --- a/src/main/java/net/minecraft/world/entity/Entity.java +++ b/src/main/java/net/minecraft/world/entity/Entity.java @@ -2630,11 +2630,12 @@ 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(world, this.getX(), this.getY() + (double) yOffset, this.getZ(), stack); + stack.setCount(0); // Paper - destroy this item - if this ever leaks due to game bugs, ensure it doesn't dupe entityitem.setDefaultPickUpDelay(); // CraftBukkit start @@ -3462,6 +3463,12 @@ public abstract class Entity implements SyncedDataHolder, Nameable, EntityAccess public Entity teleport(TeleportTransition 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 @@ -3550,6 +3557,11 @@ public abstract class Entity implements SyncedDataHolder, Nameable, EntityAccess gameprofilerfiller.pop(); return null; } else { + // Paper start - Fix item duplication and teleport issues + if (this instanceof Leashable leashable) { + leashable.dropLeash(true, true); // Paper drop lead + } + // Paper end - Fix item duplication and teleport issues entity.restoreFrom(this); this.removeAfterChangingDimensions(); // CraftBukkit start - Forward the CraftEntity to the new entity @@ -3662,6 +3674,7 @@ public abstract class Entity implements SyncedDataHolder, Nameable, EntityAccess } public boolean canTeleport(Level from, Level to) { + if (!this.isAlive() || !this.valid) return false; // Paper - Fix item duplication and teleport issues if (from.dimension() == Level.END && to.dimension() == Level.OVERWORLD) { Iterator iterator = this.getPassengers().iterator(); diff --git a/src/main/java/net/minecraft/world/entity/LivingEntity.java b/src/main/java/net/minecraft/world/entity/LivingEntity.java index 68e5f6f7013d6a014b9014d945cf3f7dc7a37cb2..65909e0a8f8b68f9a4dacefda9069c8263a96ada 100644 --- a/src/main/java/net/minecraft/world/entity/LivingEntity.java +++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java @@ -1767,9 +1767,9 @@ 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) { @@ -1863,8 +1863,13 @@ 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 e20565cf256aacd012a1722c5ebbf9016bc82e42..59fbfe8de2dc5ec020dd61a5e446b0b6f67d76e4 100644 --- a/src/main/java/net/minecraft/world/entity/decoration/ArmorStand.java +++ b/src/main/java/net/minecraft/world/entity/decoration/ArmorStand.java @@ -633,7 +633,7 @@ 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); } } @@ -641,7 +641,7 @@ 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 0627e3be754dbf8201f3212cf823e2f8cb77cdeb..6b094f8bdf1f25d5c2e108eb88d95aed4a41f6f3 100644 --- a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java +++ b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java @@ -903,6 +903,11 @@ 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); CraftWorld world = (CraftWorld) entity.getWorld(); @@ -917,11 +922,13 @@ 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;