Helper::getMaskedFile

static function getMaskedFile(string $fieldName, ?HttpRequest $request = null): ?array
{
	/** @var HttpRequest $request */
	$request = ($request ?? MainApplication::getInstance()->getContext()->getRequest());
	$mask = null;
	if ($id = $request->getPost(self::REQUEST_FIELD_NAME . $fieldName))
	{
		$mask = self::getMaskFromRequest(
			$id,
			$request->getFile(self::REQUEST_FIELD_NAME),
			$request->getPost(self::REQUEST_FIELD_NAME)
		);
	}
	return $mask;
}