Paper/patches/server/1056-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/Mob.java b/src/main/java/net/minecraft/world/entity/Mob.java
index 5af48151159135b869ec4753bbcf79dd257c1570..e0cf7771488ab0065708d68b4e8550b865af0ed4 100644
--- a/src/main/java/net/minecraft/world/entity/Mob.java
+++ b/src/main/java/net/minecraft/world/entity/Mob.java
@@ -1703,7 +1703,11 @@ public abstract class Mob extends LivingEntity implements Targeting {
             float f = 0.25F + (float) EnchantmentHelper.getBlockEfficiency(this) * 0.05F;
 
             if (this.random.nextFloat() < f) {
-                player.getCooldowns().addCooldown(Items.SHIELD, 100);
+                // Paper start
+                final io.papermc.paper.event.player.PlayerShieldDisableEvent shieldDisableEvent = new io.papermc.paper.event.player.PlayerShieldDisableEvent((org.bukkit.entity.Player) player.getBukkitEntity(), getBukkitEntity(), 100);
+                if (!shieldDisableEvent.callEvent()) return;
+                player.getCooldowns().addCooldown(Items.SHIELD, shieldDisableEvent.getCooldown());
+                // Paper end
                 this.level().broadcastEntityEvent(player, (byte) 30);
             }
         }
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 3e597833b57377b855505b8a0f2744801c791f90..ccc1caafb0ada52c7b99b7358253826f5390843e 100644
--- a/src/main/java/net/minecraft/world/entity/player/Player.java
+++ b/src/main/java/net/minecraft/world/entity/player/Player.java
@@ -979,7 +979,7 @@ public abstract class Player extends LivingEntity {
     protected void blockUsingShield(LivingEntity attacker) {
         super.blockUsingShield(attacker);
         if (attacker.canDisableShield()) {
-            this.disableShield(true);
+            this.disableShield(true, attacker); // Paper
         }
 
     }
@@ -1462,7 +1462,14 @@ public abstract class Player extends LivingEntity {
         this.attack(target);
     }
 
+    @io.papermc.paper.annotation.DoNotUse // Paper - add player shield disable event
     public void disableShield(boolean sprinting) {
+        // Paper start - add player shield disable event
+        disableShield(sprinting, null);
+    }
+
+    public void disableShield(boolean sprinting, @Nullable LivingEntity attacker) {
+        // Paper end - add player shield disable event
         float f = 0.25F + (float) EnchantmentHelper.getBlockEfficiency(this) * 0.05F;
 
         if (sprinting) {
@@ -1470,7 +1477,16 @@ public abstract class Player extends LivingEntity {
         }
 
         if (this.random.nextFloat() < f) {
-            this.getCooldowns().addCooldown(Items.SHIELD, 100);
+            // Paper start - add player shield disable event
+            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(Items.SHIELD, shieldDisableEvent.getCooldown());
+            } else {
+                this.getCooldowns().addCooldown(Items.SHIELD, 100);
+            }
+            // Paper end - add player shield disable event
             this.stopUsingItem();
             this.level().broadcastEntityEvent(this, (byte) 30);
         }