2FAuth/app/Http/Middleware/SkipIfAuthenticated.php

<?php

namespace App\Http\Middleware;

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

class SkipIfAuthenticated
{
    /**
     * Handle an incoming request.
     *
     * @param  string|null  ...$guards
     * @return mixed
     */
    public function handle(Request $request, Closure $next, ...$guards)
    {
        $guards = empty($guards) ? [null] : $guards;

        foreach ($guards as $guard) {
            if (Auth::guard($guard)->check()) {
                $user = Auth::guard($guard)->user();

                return response()->json([
                    'message'     => 'authenticated',
                    'name'        => $user->name,
                    'preferences' => $user->preferences,
                ], 200);
            }
        }

        return $next($request);
    }
}