extension String {

    var base64encoded: String? {
        if let data = self.data(using: .utf8) {
            return data.base64EncodedString(options: Data.Base64EncodingOptions(rawValue: 0))
        }
        return nil
    }

    var base64decoded: String? {
        if let data = Data(base64Encoded: self) {
            return String.init(data: data, encoding: .utf8)
        }
        return nil
    }
}