Paper/nms-patches/EntityCreeper.patch

--- a/net/minecraft/server/EntityCreeper.java
+++ b/net/minecraft/server/EntityCreeper.java
@@ -2,6 +2,11 @@
 
 import java.util.Collection;
 import java.util.Iterator;
+// CraftBukkit start
+import org.bukkit.craftbukkit.event.CraftEventFactory;
+import org.bukkit.event.entity.CreatureSpawnEvent;
+import org.bukkit.event.entity.ExplosionPrimeEvent;
+// CraftBukkit end
 
 public class EntityCreeper extends EntityMonster {
 
@@ -165,9 +170,19 @@
     @Override
     public void onLightningStrike(EntityLightning entitylightning) {
         super.onLightningStrike(entitylightning);
-        this.datawatcher.set(EntityCreeper.POWERED, true);
+        // CraftBukkit start
+        if (CraftEventFactory.callCreeperPowerEvent(this, entitylightning, org.bukkit.event.entity.CreeperPowerEvent.PowerCause.LIGHTNING).isCancelled()) {
+            return;
+        }
+
+        this.setPowered(true);
     }
 
+    public void setPowered(boolean powered) {
+        this.datawatcher.set(EntityCreeper.POWERED, powered);
+    }
+    // CraftBukkit end
+
     @Override
     protected boolean a(EntityHuman entityhuman, EnumHand enumhand) {
         ItemStack itemstack = entityhuman.b(enumhand);
@@ -192,10 +207,18 @@
             Explosion.Effect explosion_effect = this.world.getGameRules().getBoolean(GameRules.MOB_GRIEFING) ? Explosion.Effect.DESTROY : Explosion.Effect.NONE;
             float f = this.isPowered() ? 2.0F : 1.0F;
 
-            this.killed = true;
-            this.world.explode(this, this.locX, this.locY, this.locZ, (float) this.explosionRadius * f, explosion_effect);
-            this.die();
-            this.createEffectCloud();
+            // CraftBukkit start
+            ExplosionPrimeEvent event = new ExplosionPrimeEvent(this.getBukkitEntity(), this.explosionRadius * f, false);
+            this.world.getServer().getPluginManager().callEvent(event);
+            if (!event.isCancelled()) {
+                this.killed = true;
+                this.world.createExplosion(this, this.locX, this.locY, this.locZ, event.getRadius(), event.getFire(), explosion_effect);
+                this.die();
+                this.createEffectCloud();
+            } else {
+                fuseTicks = 0;
+            }
+            // CraftBukkit end
         }
 
     }
@@ -206,6 +229,7 @@
         if (!collection.isEmpty()) {
             EntityAreaEffectCloud entityareaeffectcloud = new EntityAreaEffectCloud(this.world, this.locX, this.locY, this.locZ);
 
+            entityareaeffectcloud.setSource(this); // CraftBukkit
             entityareaeffectcloud.setRadius(2.5F);
             entityareaeffectcloud.setRadiusOnUse(-0.5F);
             entityareaeffectcloud.setWaitTime(10);
@@ -219,7 +243,7 @@
                 entityareaeffectcloud.addEffect(new MobEffect(mobeffect));
             }
 
-            this.world.addEntity(entityareaeffectcloud);
+            this.world.addEntity(entityareaeffectcloud, CreatureSpawnEvent.SpawnReason.EXPLOSION); // CraftBukkit
         }
 
     }