ebayShop/app/Http/Middleware/IsUser.php

<?php

namespace App\Http\Middleware;

use Closure;
use Auth;

class IsUser
{
    /**
     * Handle an incoming request.
     *
     * @param \Illuminate\Http\Request $request
     * @param \Closure                 $next
     *
     * @return mixed
     */
    public function handle( $request, Closure $next ) {
        if ( Auth::check() &&
            ( Auth::user()->user_type == 'customer' ||
                Auth::user()->user_type == 'seller' ||
                Auth::user()->user_type == 'delivery_boy' ||
                Auth::user()->user_type == 'salesman' ) )
        {

            return $next($request);
        }
        else
        {
            session([ 'link' => url()->current() ]);
            return redirect()->route('user.login');
        }
    }
}