admin.strategy.php

<?php
namespace App\RegisterUser;

use App\Mail\WelcomeNewAdmin;
use Illuminate\Support\Facades\Mail;
use Illuminate\Support\Facades\Auth;
use Illuminate\Http\Request;
use Illuminate\Auth\Access\AuthorizationException;

class RegisterAdmin extends Registering
{
    public function handle(Request $request)
    {
    	$this->guardAgainstUnauthorized();

    	$user = $this->create($request->all());

    	// Send welcome email to newly created admin user
    	Mail::to($user)->send(new WelcomeNewAdmin($user));

    	// rediect user to dashbord
    	return redirect('dashboard.users')
    			->with('status', 'Admin user was successfully added');
    }

    /**
     * Only SuperAdmin user can add admin user
     *
     * @return boolean
     */

    private function guardAgainstUnauthorized()
    {
    	return Auth::check() && Auth::user()->superAdmin() 
    	? true 
    	: throw new ValidationException( 'This action is unauthorized.' );
    }

}