|string> */ public function rules(): array { return [ 'storage_driver' => 'required|in:local,s3', 'aws_access_key_id' => 'required_if:storage_driver,s3|nullable|string|max:255', 'aws_secret_access_key' => 'required_if:storage_driver,s3|nullable|string|max:255', 'aws_default_region' => 'required_if:storage_driver,s3|nullable|string|max:255', 'aws_bucket' => 'required_if:storage_driver,s3|nullable|string|max:255', ]; } }