Purpur/patches/server/0278-Add-an-option-to-fix-MC-3304-projectile-looting.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: MelnCat <melncatuwu@gmail.com>
Date: Sat, 1 Oct 2022 11:33:15 -0700
Subject: [PATCH] Add an option to fix MC-3304 (projectile looting)


diff --git a/src/main/java/net/minecraft/world/entity/projectile/AbstractArrow.java b/src/main/java/net/minecraft/world/entity/projectile/AbstractArrow.java
index 9710d1cd31d263b29c80923c56134b1f8f6702b0..4063aed1a3f0bfd7351c1ec2e9684e4991cb5285 100644
--- a/src/main/java/net/minecraft/world/entity/projectile/AbstractArrow.java
+++ b/src/main/java/net/minecraft/world/entity/projectile/AbstractArrow.java
@@ -72,6 +72,7 @@ public abstract class AbstractArrow extends Projectile {
     private IntOpenHashSet piercingIgnoreEntityIds;
     @Nullable
     private List<Entity> piercedAndKilledEntities;
+    public int lootingLevel; // Purpur
 
     // Spigot Start
     @Override
@@ -612,6 +613,12 @@ public abstract class AbstractArrow extends Projectile {
         this.knockback = punch;
     }
 
+    // Purpur start
+    public void setLootingLevel(int looting) {
+        this.lootingLevel = looting;
+    }
+    // Purpur end
+
     public int getKnockback() {
         return this.knockback;
     }
diff --git a/src/main/java/net/minecraft/world/item/BowItem.java b/src/main/java/net/minecraft/world/item/BowItem.java
index 220513d3fd5645322886522ea4f6b8c55d043b3c..d45a2f49c82d00801578c34e5f5277fc5e82be87 100644
--- a/src/main/java/net/minecraft/world/item/BowItem.java
+++ b/src/main/java/net/minecraft/world/item/BowItem.java
@@ -64,6 +64,13 @@ public class BowItem extends ProjectileWeaponItem implements Vanishable {
                         if (EnchantmentHelper.getItemEnchantmentLevel(Enchantments.FLAMING_ARROWS, stack) > 0) {
                             entityarrow.setSecondsOnFire(100);
                         }
+                        // Purpur start
+                        int lootingLevel = EnchantmentHelper.getItemEnchantmentLevel(Enchantments.MOB_LOOTING, stack);
+
+                        if (lootingLevel > 0) {
+                            entityarrow.setLootingLevel(lootingLevel);
+                        }
+                        // Purpur end
                         // CraftBukkit start
                         org.bukkit.event.entity.EntityShootBowEvent event = org.bukkit.craftbukkit.event.CraftEventFactory.callEntityShootBowEvent(entityhuman, stack, itemstack1, entityarrow, entityhuman.getUsedItemHand(), f, !flag1);
                         if (event.isCancelled()) {
diff --git a/src/main/java/net/minecraft/world/item/CrossbowItem.java b/src/main/java/net/minecraft/world/item/CrossbowItem.java
index 0a0f19f73a6a4e5aece7c17089dc4d31ed2a5299..2c51a73ebfd05af21b0f5d731fc9f1df77fed1a1 100644
--- a/src/main/java/net/minecraft/world/item/CrossbowItem.java
+++ b/src/main/java/net/minecraft/world/item/CrossbowItem.java
@@ -291,6 +291,14 @@ public class CrossbowItem extends ProjectileWeaponItem implements Vanishable {
             entityarrow.setPierceLevel((byte) i);
         }
 
+        // Purpur start
+        int lootingLevel = EnchantmentHelper.getItemEnchantmentLevel(Enchantments.MOB_LOOTING, crossbow);
+
+        if (lootingLevel > 0) {
+            entityarrow.setLootingLevel(lootingLevel);
+        }
+        // Purpur end
+
         return entityarrow;
     }
 
diff --git a/src/main/java/net/minecraft/world/item/TridentItem.java b/src/main/java/net/minecraft/world/item/TridentItem.java
index 6d1573161f0d8c7999f84925ba7bbf536ee9583a..c32cbe6065ecb6810f352b8a3598c21e42e60e1d 100644
--- a/src/main/java/net/minecraft/world/item/TridentItem.java
+++ b/src/main/java/net/minecraft/world/item/TridentItem.java
@@ -82,6 +82,14 @@ public class TridentItem extends Item implements Vanishable {
                                 entitythrowntrident.pickup = AbstractArrow.Pickup.CREATIVE_ONLY;
                             }
 
+                            // Purpur start
+                            int lootingLevel = EnchantmentHelper.getItemEnchantmentLevel(net.minecraft.world.item.enchantment.Enchantments.MOB_LOOTING, stack);
+
+                            if (lootingLevel > 0) {
+                                entitythrowntrident.setLootingLevel(lootingLevel);
+                            }
+                            // Purpur end
+
                             // CraftBukkit start
                             // Paper start
                             com.destroystokyo.paper.event.player.PlayerLaunchProjectileEvent event = new com.destroystokyo.paper.event.player.PlayerLaunchProjectileEvent((org.bukkit.entity.Player) entityhuman.getBukkitEntity(), org.bukkit.craftbukkit.inventory.CraftItemStack.asCraftMirror(stack), (org.bukkit.entity.Projectile) entitythrowntrident.getBukkitEntity());
diff --git a/src/main/java/net/minecraft/world/level/storage/loot/functions/LootingEnchantFunction.java b/src/main/java/net/minecraft/world/level/storage/loot/functions/LootingEnchantFunction.java
index 3fb1e558c3510243c94981211f9a0e5e0ef1895b..e5177e5ffcac360f935f2139db4554c6586b551e 100644
--- a/src/main/java/net/minecraft/world/level/storage/loot/functions/LootingEnchantFunction.java
+++ b/src/main/java/net/minecraft/world/level/storage/loot/functions/LootingEnchantFunction.java
@@ -57,6 +57,13 @@ public class LootingEnchantFunction extends LootItemConditionalFunction {
 
         if (entity instanceof LivingEntity) {
             int i = EnchantmentHelper.getMobLooting((LivingEntity) entity);
+            // Purpur start
+            if (org.purpurmc.purpur.PurpurConfig.fixProjectileLootingTransfer &&
+                    context.getParamOrNull(LootContextParams.DIRECT_KILLER_ENTITY)
+                        instanceof net.minecraft.world.entity.projectile.AbstractArrow arrow) {
+                i = arrow.lootingLevel;
+            }
+            // Purpur end
             // CraftBukkit start - use lootingModifier if set by plugin
             if (context.hasParam(LootContextParams.LOOTING_MOD)) {
                 i = context.getParamOrNull(LootContextParams.LOOTING_MOD);
diff --git a/src/main/java/org/purpurmc/purpur/PurpurConfig.java b/src/main/java/org/purpurmc/purpur/PurpurConfig.java
index 62aabfc021fa3349b0ab46744a9ec78d57f058b0..32aaa66acc35950caec1a0b0dac9413e950b37a6 100644
--- a/src/main/java/org/purpurmc/purpur/PurpurConfig.java
+++ b/src/main/java/org/purpurmc/purpur/PurpurConfig.java
@@ -568,4 +568,9 @@ public class PurpurConfig {
     private static void fixNetworkSerializedCreativeItems() {
         fixNetworkSerializedItemsInCreative = getBoolean("settings.fix-network-serialized-items-in-creative", fixNetworkSerializedItemsInCreative);
     }
+
+    public static boolean fixProjectileLootingTransfer = false;
+    private static void fixProjectileLootingTransfer() {
+        fixProjectileLootingTransfer = getBoolean("settings.fix-projectile-looting-transfer", fixProjectileLootingTransfer);
+    }
 }