neiyou_user_web/app/Http/Middleware/isAdminlogin.php

<?php

namespace App\Http\Middleware;

use Closure;
use Illuminate\Http\Request;
use Redirect;

class isAdminLogin
{

    /**
     * Handle an incoming request.
     *
     * @param  Request  $request
     * @param  Closure  $next
     *
     * @return mixed
     */
    public function handle(Request $request, Closure $next)
    {
        if (auth()->guest()) {
            return Redirect::to('admin/login');
        }

        return $next($request);
    }

}