Paper/nms-patches/BlockEnderPortal.patch

--- a/net/minecraft/server/BlockEnderPortal.java
+++ b/net/minecraft/server/BlockEnderPortal.java
@@ -2,6 +2,8 @@
 
 import java.util.Random;
 
+import org.bukkit.event.entity.EntityPortalEnterEvent; // CraftBukkit
+
 public class BlockEnderPortal extends BlockTileEntity {
 
     protected static final VoxelShape a = Block.a(0.0D, 0.0D, 0.0D, 16.0D, 12.0D, 16.0D);
@@ -28,6 +30,10 @@
 
     public void a(IBlockData iblockdata, World world, BlockPosition blockposition, Entity entity) {
         if (!world.isClientSide && !entity.isPassenger() && !entity.isVehicle() && entity.bm() && VoxelShapes.c(VoxelShapes.a(entity.getBoundingBox().d((double) (-blockposition.getX()), (double) (-blockposition.getY()), (double) (-blockposition.getZ()))), iblockdata.getShape(world, blockposition), OperatorBoolean.AND)) {
+            // CraftBukkit start - Entity in portal
+            EntityPortalEnterEvent event = new EntityPortalEnterEvent(entity.getBukkitEntity(), new org.bukkit.Location(world.getWorld(), blockposition.getX(), blockposition.getY(), blockposition.getZ()));
+            world.getServer().getPluginManager().callEvent(event);
+            // CraftBukkit end
             entity.a(DimensionManager.THE_END);
         }