import json


class Letter:
    sign = "计算得到"
    encryptType = "SM4_GCM"
    encryptKey = "计算获得"  # recvPubKey 加密后的 对称加密秘钥 数据
    recvPubKey = ""
    senderPubKey = ""

    fileName = ""
    fileBase64 = ""

    def to_dict(self):
        return {
            "sign": self.sign,
            "encryptType": self.encryptType,
            "encryptKey": self.encryptKey,
            "recvPubKey": self.recvPubKey,
            "senderPubKey": self.senderPubKey,
            "fileName": self.fileName,
            "fileBase64": self.fileBase64
        }

def json_to_obj(json_str):
    new_obj= Letter()
    new_obj.sign = json_str["sign"]
    new_obj.encryptType = json_str["encryptType"]
    new_obj.encryptKey = json_str["encryptKey"]
    new_obj.recvPubKey = json_str["recvPubKey"]
    new_obj.senderPubKey = json_str["senderPubKey"]
    new_obj.fileName = json_str["fileName"]
    new_obj.fileBase64 = json_str["fileBase64"]
    return new_obj

# test code
if __name__ == '__main__':
    letter = Letter()
    # print(json.dumps(letter.to_dict(), indent=1))
    json_dict = json.loads(json.dumps(letter.to_dict()))
    print(json_dict.__dir__)