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 828ffad0902d28c0dc86995f5f7270c54cd9d32c..7fc411c91b722d1f3494ef8eb37eeed7bbf10475 100644 --- a/src/main/java/net/minecraft/world/entity/Entity.java +++ b/src/main/java/net/minecraft/world/entity/Entity.java @@ -2403,11 +2403,12 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, S } 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 @@ -3206,6 +3207,12 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, S @Nullable public Entity teleportTo(ServerLevel worldserver, Vec3 location) { // CraftBukkit end + // Paper start - Fix item duplication and teleport issues + if (!this.isAlive() || !this.valid) { + LOGGER.warn("Illegal Entity Teleport " + this + " to " + worldserver + ":" + location, new Throwable()); + return null; + } + // Paper end - Fix item duplication and teleport issues if (this.level() instanceof ServerLevel && !this.isRemoved()) { this.level().getProfiler().push("changeDimension"); // CraftBukkit start @@ -3232,6 +3239,11 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, S // CraftBukkit end this.level().getProfiler().popPush("reloading"); + // 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 Entity entity = this.getType().create(worldserver); if (entity != null) { @@ -3249,10 +3261,6 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, S // 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 } @@ -3371,7 +3379,7 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, S } public boolean canChangeDimensions() { - return !this.isPassenger() && !this.isVehicle(); + return !this.isPassenger() && !this.isVehicle() && isAlive() && 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 8fff7d4c98e198bba0b4076807adc67476fcaf4b..035faf890c02ebd5bdbb430dc473e7a1bc7b9fd1 100644 --- a/src/main/java/net/minecraft/world/entity/LivingEntity.java +++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java @@ -1706,9 +1706,9 @@ public abstract class LivingEntity extends Entity implements Attackable { // Paper start org.bukkit.event.entity.EntityDeathEvent deathEvent = this.dropAllDeathLoot(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) { @@ -1809,8 +1809,13 @@ public abstract class LivingEntity extends Entity implements Attackable { 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 ddd512e1d7608ec051fb5adf6ec2c6bbb93f5a9d..4e3cf19b83410f3bcacd953a600bf0bed6e45450 100644 --- a/src/main/java/net/minecraft/world/entity/decoration/ArmorStand.java +++ b/src/main/java/net/minecraft/world/entity/decoration/ArmorStand.java @@ -624,7 +624,7 @@ 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); } } @@ -632,7 +632,7 @@ 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 2b342f81ae8bfefe2a240351f28fcafc40609a75..c9fbc54d7ba10da4f4c376e029b64fb0249171a3 100644 --- a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java +++ b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java @@ -893,6 +893,11 @@ 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 @@ -906,11 +911,13 @@ 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;