#!/usr/bin/python
# -*- coding: UTF-8 -*-
#
# 签名
# 字典升序
# 拼接规则：secret_key_value+key+value
# author: Scott Chen
# date: 2019-12-17

import time
from hashlib import md5
from log_ware import LogWare
logger = LogWare().get_logger()


class Signature:

    def __init__(self, in_params_map, secret_key):
        self.__params = in_params_map
        self.__secret_key = secret_key
        self.__sort_params = {}
        self.__joint_str = ''
        self.__out_params = in_params_map

    # 请求参数字典排序-升序
    def __dict_sort_asc(self):
        temp = sorted(self.__params.items())
        for i in temp:
            self.__sort_params[i[0]] = i[1]
        logger.debug('升序排列后：%s', str(self.__sort_params))

    # 参数拼接
    def __params_joint(self):
        self.__joint_str += self.__secret_key
        for k, v in self.__sort_params.items():
            self.__joint_str += (k + v)
        logger.debug('参数拼接后：%s', str(self.__joint_str))

    # md5签名
    def sign_with_md5(self):
        self.__dict_sort_asc()
        self.__params_joint()
        sign_str = md5(self.__joint_str.encode("utf-8")).hexdigest()
        logger.debug('md5签名的参数值：%s', sign_str)

        self.__out_params['sign'] = sign_str
        logger.debug('请求参数签名结果：%s', str(self.__out_params))
        return self.__out_params


# 单元测试
if __name__ == '__main__':
    data = {
        'merchId': '111',
        'merchName': '商户',
        'thirdPartyMerchCode': '222',
        'thirdPartyMerchName': '三方商户',
        'name': '张三',
        'idCard': '440305198009183074',
        'isCheckIdCard': '0'
    }
    params_map = {
        'merchId': '111',
        'data': str(data),
        'timestamp': str(int(time.time()))
    }
    secret_key = 'abc789'

    instance = Signature(params_map, secret_key)
    ret = instance.sign_with_md5()
    logger.debug(str(ret))