ASJServer/Object/WechatPayObject.py

import hashlib
import time
from urllib.parse import quote

import requests
import xmltodict

from Ansjer.config import BASE_DIR


class WechatPayObject:
    """配置账号信息"""
    # 微信公众号身份的唯一标识。审核通过后，在微信发送的邮件中查看

    def __init__(self):
        # 开发者调用支付统一下单API生成预交易单
        self.APPID = 'wx2a9f5ef9baf2760f'
        # 商户id
        self.MCHID = '1508209741'
        # 异步通知url，商户根据实际开发过程设定
        self.NOTIFY_URL = 'test'
        self.TRADE_TYPE = 'APP'
        self.APIKEY = 'ZHansjeransjeransjer680301000000'
        self.url = 'https://api.mch.weixin.qq.com/pay/unifiedorder'  # 微信请求url
        self.refund_url = 'https://api.mch.weixin.qq.com/secapi/pay/refund'   # 退款url
        self.error = None
        self.params = None

    def get_parameter(self, order_id, body, total_fee, spbill_create_ip, notify_url, attach):
        self.params = {
            'appid': self.APPID,  # appid
            'mch_id': self.MCHID,  # 商户号
            'nonce_str': self.getNonceStr(),
            'body': body,  # 商品描述
            'out_trade_no': str(order_id),  # 商户订单号
            'total_fee': str(int(total_fee)),
            'spbill_create_ip': spbill_create_ip,  # 127.0.0.1
            'trade_type': self.TRADE_TYPE,  # 交易类型
            'notify_url': notify_url,  # 微信支付结果异步通知地址
            'receipt': 'Y',
            'attach' : attach
        }
        return self.params

    def getNonceStr(self, length=32):
        """生成随机字符串"""
        import random
        chars = "abcdefghijklmnopqrstuvwxyz0123456789"
        strs = []
        for x in range(length):
            strs.append(chars[random.randrange(0, len(chars))])
        return "".join(strs)

    def key_value_url(self, value, urlencode):
        """
        将键值对转为 key1=value1&key2=value2
        对参数按照key=value的格式，并按照参数名ASCII字典序排序
        """
        slist = sorted(value)
        buff = []
        for k in slist:
            v = quote(value[k]) if urlencode else value[k]
            buff.append("{0}={1}".format(k, v))

        return "&".join(buff)

    def get_sign(self, params):
        """
        生成sign
        拼接API密钥
        """
        stringA = self.key_value_url(params, False)
        stringSignTemp = stringA + '&key=' + self.APIKEY  # APIKEY, API密钥，需要在商户后台设置
        sign = (hashlib.md5(stringSignTemp.encode("utf-8")).hexdigest()).upper()
        params['sign'] = sign
        return params

    def get_req_xml(self):
        """
        拼接XML
        """
        self.get_sign(self.params)
        xml = "<xml>"
        for k, v in self.params.items():
            # v = v.encode('utf8')
            # k = k.encode('utf8')
            xml += '<' + k + '>' + v + '</' + k + '>'
        xml += "</xml>"
        return xml.encode("utf-8")

    def get_prepay_id(self):
        """
        请求获取prepay_id
        """
        xml = self.get_req_xml()
        respone = requests.post(self.url, xml, headers={'Content-Type': 'application/xml'})
        msg = respone.text.encode('ISO-8859-1').decode('utf-8')
        xmlresp = xmltodict.parse(msg)
        if xmlresp['xml']['return_code'] == 'SUCCESS':
            if xmlresp['xml']['result_code'] == 'SUCCESS':
                prepay_id = xmlresp['xml']['prepay_id']
                self.params['prepay_id'] = prepay_id
                self.params['packageId'] = "Sign=WXPay"
                self.params['timestamp'] = str(int(time.time()))
                return self.params
            else:
                return 'failure'
        else:
            return 'failure'

    def re_finall(self,orderid = None):
        """得到prepay_id后再次签名，返回给终端参数.
        """
        self.get_prepay_id()
        if self.error:
            return False
        sign_again_params = {
            'appid': self.params['appid'],
            'noncestr': self.params['nonce_str'],
            'package': self.params['packageId'],
            'partnerid': self.params['mch_id'],
            'timestamp': self.params['timestamp'],
            'prepayid': self.params['prepay_id']
        }
        self.get_sign(sign_again_params)
        sign_again_params['sign'] = sign_again_params['sign']
        sign_again_params['packageId'] = sign_again_params['package']
        sign_again_params['out_trade_no'] = orderid
        return sign_again_params  # 返回给app

    def get_notifypay(self, data):

        success = self.get_sign(data)
        # print('success', success)
        if success:
            success.pop("sign", None)
            success.pop("sign_type", None)
            # return success
            return True
        else:
            return False

    def weixinpay_call_back(self, data):

        args = str(data, 'utf-8')

        if args is None:
            return None

        print(args)

        # 验证平台签名

        resp_dict = self.handle_wx_response_xml(args)
        if resp_dict is None:
            print('签名验证失败！！！')
            return None

        return resp_dict

    def handle_wx_response_xml(self, params):

        """

        处理微信支付返回的xml格式数据

        """

        try:

            resp_dict = xmltodict.parse(params)['xml']

            if not resp_dict or len(resp_dict) < 1:
                print('resp_dict is zero+++++++++')

                return None

            return_code = resp_dict.get('return_code')

            if return_code == 'SUCCESS':  # 仅仅判断通信标识成功，非交易标识成功，交易需判断result_code
                return resp_dict


        except Exception as e:
            print(e)

            return None

        return None

    @staticmethod
    def xml_to_dict(params):
        """
        拼接XML
        """
        if not isinstance(params, dict):
            return None
        xml = "<xml>"
        for k, v in params.items():
            # v = v.encode('utf8')
            # k = k.encode('utf8')
            xml += '<' + k + '>' + v + '</' + k + '>'
        xml += "</xml>"
        return xml

    def refund(self, out_trade_no, out_refund_no, total_fee, refund_fee):
        params = {
            'appid': self.APPID,
            'mch_id': self.MCHID,
            'nonce_str': self.getNonceStr(),
            'out_trade_no': out_trade_no,   # 商户订单号
            'out_refund_no': out_refund_no,    # 商户退款单号
            'total_fee': total_fee,     # 订单金额
            'refund_fee': refund_fee    # 退款金额
        }
        # doc: https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=4_3
        string_sign = "&".join([f"{k}={params[k]}" for k in sorted(params)] + [f"{'key'}={self.APIKEY}"])
        params['sign'] = hashlib.md5(string_sign.encode('utf8')).hexdigest().upper()   # MD5签名
        xml = "<xml>{}</xml>".format("".join([f"<{k}>{v}</{k}>" for k, v in params.items()]))   # 数据拼接成xml格式
        cert = f"{BASE_DIR}/Ansjer/file/wechatpay/apiclient_cert.pem"
        key = f"{BASE_DIR}/Ansjer/file/wechatpay/apiclient_key.pem"
        r = requests.post(url=self.refund_url, headers={'Content-Type': 'text/xml'}, data=xml.encode('utf-8'),
                          cert=(cert, key), verify=True)
        response = xmltodict.parse(r.text)
        if response['xml']['return_code'] == 'SUCCESS':
            return True
        else:
            return False