Purpur/patches/server/0263-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 342eaa0e3b053e9b39dc58fa92cd18cac446a844..06f7bc4d8d6679d6625a8d392777722fc97739ba 100644
--- a/src/main/java/net/minecraft/world/entity/projectile/AbstractArrow.java
+++ b/src/main/java/net/minecraft/world/entity/projectile/AbstractArrow.java
@@ -77,6 +77,7 @@ public abstract class AbstractArrow extends Projectile {
     @Nullable
     private List<Entity> piercedAndKilledEntities;
     public ItemStack pickupItemStack;
+    public int lootingLevel; // Purpur
 
     // Spigot Start
     @Override
@@ -655,6 +656,12 @@ 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/ProjectileWeaponItem.java b/src/main/java/net/minecraft/world/item/ProjectileWeaponItem.java
index d27e83c08c45b8514207f26e48ceb1a91ded94be..8f01772a7b06b2acf96a3f922cb9b481f634680b 100644
--- a/src/main/java/net/minecraft/world/item/ProjectileWeaponItem.java
+++ b/src/main/java/net/minecraft/world/item/ProjectileWeaponItem.java
@@ -131,6 +131,14 @@ public abstract class ProjectileWeaponItem extends Item {
             entityarrow.setPierceLevel((byte) k);
         }
 
+        // Purpur start
+        int lootingLevel = EnchantmentHelper.getItemEnchantmentLevel(Enchantments.LOOTING, weaponStack);
+
+        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 85dc79b9b969fa0cbf6964cb26bac139fa55710a..905a020dd7b365d51d5addadbbeb9555d03c5238 100644
--- a/src/main/java/net/minecraft/world/item/TridentItem.java
+++ b/src/main/java/net/minecraft/world/item/TridentItem.java
@@ -81,6 +81,14 @@ public class TridentItem extends Item implements ProjectileItem {
                                 entitythrowntrident.pickup = AbstractArrow.Pickup.CREATIVE_ONLY;
                             }
 
+                            // Purpur start
+                            int lootingLevel = EnchantmentHelper.getItemEnchantmentLevel(net.minecraft.world.item.enchantment.Enchantments.LOOTING, stack);
+
+                            if (lootingLevel > 0) {
+                                entitythrowntrident.setLootingLevel(lootingLevel);
+                            }
+                            // Purpur end
+
                             // CraftBukkit start
                             // Paper start - PlayerLaunchProjectileEvent
                             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 cfe953bc924f46b570e37395ac0f05ebcb82eb39..5500e7ada2dd783cc1317968a3e54696bdd73bf8 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 62612451c23bb146e82f4082ca8677e5dc57a08f..3b3d5bd9e645f440e033abd3c234a017972efa59 100644
--- a/src/main/java/org/purpurmc/purpur/PurpurConfig.java
+++ b/src/main/java/org/purpurmc/purpur/PurpurConfig.java
@@ -497,4 +497,9 @@ public class PurpurConfig {
         String setPattern = getString("settings.username-valid-characters", defaultPattern);
         usernameValidCharactersPattern = java.util.regex.Pattern.compile(setPattern == null || setPattern.isBlank() ? defaultPattern : setPattern);
     }
+
+    public static boolean fixProjectileLootingTransfer = false;
+    private static void fixProjectileLootingTransfer() {
+        fixProjectileLootingTransfer = getBoolean("settings.fix-projectile-looting-transfer", fixProjectileLootingTransfer);
+    }
 }