public function isImageFileExtensionKosher($filename) {

        // must have acceptable file extension
        $imageFileExtension = $this->ImagesHelper->filenameWithExtensionOnly($filename);

        $haystack = Config::get('lasallecmsfrontend.acceptable_image_extensions_for_uploading');

        if (in_array(strtolower($imageFileExtension), $haystack)) {
            return true;
        }

        return false;
    }