Paper/patches/server/0909-Add-PlayerShieldDisableEvent.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Cryptite <cryptite@gmail.com>
Date: Mon, 1 May 2023 16:22:43 -0500
Subject: [PATCH] Add PlayerShieldDisableEvent

Called whenever a players shield is disabled. This is mainly caused by
attacking players or monsters that carry axes.

The event, while similar to the PlayerItemCooldownEvent, offers other
behaviour and can hence not be implemented as a childtype of said event.
Specifically, cancelling the event prevents the game events from being
sent to the player.

Plugins listening to just the PlayerItemCooldownEvent may not want said
sideeffects, meaning the disable event cannot share a handlerlist with
the cooldown event

diff --git a/src/main/java/net/minecraft/world/entity/player/Player.java b/src/main/java/net/minecraft/world/entity/player/Player.java
index a19a795deaa7f46c92b97912e2ade006bc90c2d5..61d412c4f1ebd55661cc3f0260468e3ac0efe0bb 100644
--- a/src/main/java/net/minecraft/world/entity/player/Player.java
+++ b/src/main/java/net/minecraft/world/entity/player/Player.java
@@ -970,7 +970,7 @@ public abstract class Player extends LivingEntity {
         ItemStack itemstack = this.getItemBlockingWith();
 
         if (attacker.canDisableShield() && itemstack != null) {
-            this.disableShield(itemstack);
+            this.disableShield(itemstack, attacker); // Paper - Add PlayerShieldDisableEvent
         }
 
     }
@@ -1463,8 +1463,21 @@ public abstract class Player extends LivingEntity {
         this.attack(target);
     }
 
+    @io.papermc.paper.annotation.DoNotUse @Deprecated // Paper - Add PlayerShieldDisableEvent
     public void disableShield(ItemStack shield) {
-        this.getCooldowns().addCooldown(shield, 100);
+        // Paper start - Add PlayerShieldDisableEvent
+        this.disableShield(shield, null);
+    }
+    public void disableShield(ItemStack shield, @Nullable LivingEntity attacker) {
+        final org.bukkit.entity.Entity finalAttacker = attacker != null ? attacker.getBukkitEntity() : null;
+        if (finalAttacker != null) {
+            final io.papermc.paper.event.player.PlayerShieldDisableEvent shieldDisableEvent = new io.papermc.paper.event.player.PlayerShieldDisableEvent((org.bukkit.entity.Player) getBukkitEntity(), finalAttacker, 100);
+            if (!shieldDisableEvent.callEvent()) return;
+            this.getCooldowns().addCooldown(shield, shieldDisableEvent.getCooldown());
+        } else {
+            this.getCooldowns().addCooldown(shield, 100);
+        }
+        // Paper end - Add PlayerShieldDisableEvent
         this.stopUsingItem();
         this.level().broadcastEntityEvent(this, (byte) 30);
     }