ldc-legaulois/app/Http/Middleware/IsAdmin.php

<?php

namespace App\Http\Middleware;

use Closure;
use Illuminate\Support\Facades\Auth;

class IsAdmin
{
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request $request
     * @param  \Closure                 $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
        $role = Auth::user()->role;
        if ($role === 1 || $role === 2) {
            return $next($request);
        }
        abort(404, "Cette page n'existe pas.");
    }
}