exhibition_service_api/app/Http/Middleware/NormalUserAuthenticate.php

<?php

namespace App\Http\Middleware;

use Closure;
use Illuminate\Contracts\Auth\Factory as Auth;
use App\Exceptions\ApiException;

class NormalUserAuthenticate
{
    /**
     * The authentication guard factory instance.
     *
     * @var \Illuminate\Contracts\Auth\Factory
     */
    protected $auth;

    /**
     * Create a new middleware instance.
     *
     * @param  \Illuminate\Contracts\Auth\Factory $auth
     */
    public function __construct(Auth $auth)
    {
        $this->auth = $auth;
    }

    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request $request
     * @param  \Closure $next
     * @param  string|null $guard
     * @return mixed
     * @throws ApiException
     */
    public function handle($request, Closure $next, $guard = null)
    {
        if(empty($request->user())){
            throw new ApiException(401);
        }
        return $next($request);
    }
}