function getCertificates($path)
    {
        return collect($this->files->scandir($path))->filter(function ($value, $key) {
            return ends_with($value, '.crt');
        })->map(function ($cert) {
            $certWithoutSuffix = substr($cert, 0, -4);
            return substr($certWithoutSuffix, 0, strrpos($certWithoutSuffix, '.'));
        })->flip();
    }