PaperMC/nms-patches/EntityFireworks.patch

--- a/net/minecraft/server/EntityFireworks.java
+++ b/net/minecraft/server/EntityFireworks.java
@@ -3,12 +3,13 @@
 import java.util.Iterator;
 import java.util.List;
 import java.util.OptionalInt;
+import org.bukkit.craftbukkit.event.CraftEventFactory; // CraftBukkit
 
 public class EntityFireworks extends Entity implements IProjectile {
 
     public static final DataWatcherObject<ItemStack> FIREWORK_ITEM = DataWatcher.a(EntityFireworks.class, DataWatcherRegistry.g);
     private static final DataWatcherObject<OptionalInt> c = DataWatcher.a(EntityFireworks.class, DataWatcherRegistry.r);
-    private static final DataWatcherObject<Boolean> d = DataWatcher.a(EntityFireworks.class, DataWatcherRegistry.i);
+    public static final DataWatcherObject<Boolean> d = DataWatcher.a(EntityFireworks.class, DataWatcherRegistry.i); // PAIL
     private int ticksFlown;
     public int expectedLifespan;
     private EntityLiving ridingEntity;
@@ -133,7 +134,11 @@
         }
 
         if (!this.world.isClientSide && this.ticksFlown > this.expectedLifespan) {
-            this.explode();
+            // CraftBukkit start
+            if (!org.bukkit.craftbukkit.event.CraftEventFactory.callFireworkExplodeEvent(this).isCancelled()) {
+                this.explode();
+            }
+            // CraftBukkit end
         }
 
     }
@@ -146,7 +151,11 @@
 
     protected void a(MovingObjectPosition movingobjectposition) {
         if (movingobjectposition.getType() == MovingObjectPosition.EnumMovingObjectType.ENTITY && !this.world.isClientSide) {
-            this.explode();
+            // CraftBukkit start
+            if (!org.bukkit.craftbukkit.event.CraftEventFactory.callFireworkExplodeEvent(this).isCancelled()) {
+                this.explode();
+            }
+            // CraftBukkit end
         } else if (this.z) {
             BlockPosition blockposition;
 
@@ -158,7 +167,11 @@
 
             this.world.getType(blockposition).a(this.world, blockposition, (Entity) this);
             if (this.l()) {
-                this.explode();
+                // CraftBukkit start
+                if (!org.bukkit.craftbukkit.event.CraftEventFactory.callFireworkExplodeEvent(this).isCancelled()) {
+                    this.explode();
+                }
+                // CraftBukkit end
             }
         }
 
@@ -184,7 +197,9 @@
 
         if (f > 0.0F) {
             if (this.ridingEntity != null) {
+                CraftEventFactory.entityDamage = this; // CraftBukkit
                 this.ridingEntity.damageEntity(DamageSource.FIREWORKS, 5.0F + (float) (nbttaglist.size() * 2));
+                CraftEventFactory.entityDamage = null; // CraftBukkit
             }
 
             double d0 = 5.0D;
@@ -211,7 +226,9 @@
                     if (flag) {
                         float f1 = f * (float) Math.sqrt((5.0D - (double) this.g(entityliving)) / 5.0D);
 
+                        CraftEventFactory.entityDamage = this; // CraftBukkit
                         entityliving.damageEntity(DamageSource.FIREWORKS, f1);
+                        CraftEventFactory.entityDamage = null; // CraftBukkit
                     }
                 }
             }