PaperMC/nms-patches/EntityWitherSkull.patch

--- a/net/minecraft/server/EntityWitherSkull.java
+++ b/net/minecraft/server/EntityWitherSkull.java
@@ -1,5 +1,7 @@
 package net.minecraft.server;
 
+import org.bukkit.event.entity.ExplosionPrimeEvent; // CraftBukkit
+
 public class EntityWitherSkull extends EntityFireball {
 
     public EntityWitherSkull(World world) {
@@ -35,9 +37,9 @@
         if (!this.world.isClientSide) {
             if (movingobjectposition.entity != null) {
                 if (this.shooter != null) {
-                    if (movingobjectposition.entity.damageEntity(DamageSource.mobAttack(this.shooter), 8.0F)) {
+                    if (movingobjectposition.entity.damageEntity(DamageSource.projectile(this, shooter), 8.0F)) { // CraftBukkit
                         if (!movingobjectposition.entity.isAlive()) {
-                            this.shooter.heal(5.0F);
+                            this.shooter.heal(5.0F, org.bukkit.event.entity.EntityRegainHealthEvent.RegainReason.WITHER); // CraftBukkit
                         } else {
                             this.a(this.shooter, movingobjectposition.entity);
                         }
@@ -61,7 +63,15 @@
                 }
             }
 
-            this.world.createExplosion(this, this.locX, this.locY, this.locZ, 1.0F, false, this.world.getGameRules().getBoolean("mobGriefing"));
+            // CraftBukkit start
+            // this.world.createExplosion(this, this.locX, this.locY, this.locZ, 1.0F, false, this.world.getGameRules().getBoolean("mobGriefing"));
+            ExplosionPrimeEvent event = new ExplosionPrimeEvent(this.getBukkitEntity(), 1.0F, false);
+            this.world.getServer().getPluginManager().callEvent(event);
+
+            if (!event.isCancelled()) {
+                this.world.createExplosion(this, this.locX, this.locY, this.locZ, event.getRadius(), event.getFire(), this.world.getGameRules().getBoolean("mobGriefing"));
+            }
+            // CraftBukkit end
             this.die();
         }