微信JSAPI支付

class WeiXinPay(object):
    """配置账号信息"""
    # =======【基本信息设置】=====================================
    # 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
    APPID = "xxx"  #公众号appid
    APPSECRET = "" #公众号appsecret
    MCHID = "333" # 商户号ID，身份标识
    # 异步通知url，商户根据实际开发过程设定
    NOTIFY_URL = "https://shepaipai.vip/app_pay_back"
    TRADE_TYPE = 'JSAPI'
    APIKEY = "**********"  # 商户秘钥

    def __init__(self, order_id, body, total_fee, spbill_create_ip,openid):
        if body == "平台-充值":
            self.NOTIFY_URL = "www.baidu.com" # 异步通知url
        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)),  !!! 正式环境
            'total_fee': '1',
            'spbill_create_ip': spbill_create_ip,  # 127.0.0.1
            'trade_type': self.TRADE_TYPE,  # 交易类型
            'openid': openid,  # trade_type为JSAPI时，openid为必填参数！
            'notify_url': self.NOTIFY_URL  # 微信支付结果异步通知地址
        }
        # 开发者调用支付统一下单API生成预交易单
        self.url = 'https://api.mch.weixin.qq.com/pay/unifiedorder'  # 微信请求url
        self.error = None

    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 getOpenID(self, code):
        '''获取 openid'''
        param = {
            'code': code,  # 用户点击按钮跳转到微信授权页, 微信处理完后重定向到redirect_uri, 并给我们加上code=xxx的参数, 这个code就是我们需要的
            'appid': self.params['appid'],
            'secret': self.params['APPSECRET'],
            'grant_type': self.params['JSAPI'],
        }

        # 通过code获取access_token
        openIdUrl = 'https://api.weixin.qq.com/sns/oauth2/access_token'
        resp = requests.get(openIdUrl, params=param)
        # {openid, accss_token, refresh_token, openid, scope, expires_in}
        openId = json.loads(resp.text)['openid']
        # return resp.text
        return openId

    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
        print(stringSignTemp)
        sign = (hashlib.md5(stringSignTemp.encode("utf-8")).hexdigest()).upper()
        params['sign'] = sign
        return self.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()
        print(xml)
        
        respone = requests.post(self.url, xml, headers={'Content-Type': 'application/xml'})
        content = xml_to_dict(respone.content)      
        if content['return_code'] == 'SUCCESS':
                prepay_id = content['prepay_id']
        else:
            return 1

    def re_finall(self):
        """得到prepay_id后再次签名，返回给终端参数
        """
        self.get_prepay_id()
        if self.error:
            return
        sign_again_params = {
            'appId': self.params['appid'],
            'nonceStr': self.params['nonce_str'],
            'timeStamp': self.params['timestamp'],
            'package': 'prepay_id=' + self.params['prepay_id'],
            'signType': 'MD5',
        }
        self.get_sign(sign_again_params)
        self.params['sign'] = sign_again_params['sign']

        # # 移除其他不需要返回参数
        # for i in self.params.keys():
        #     print(i)
        #     if i not in ['appid', 'mch_id', 'nonce_str', 'timestamp', 'sign', 'package', 'prepay_id']:
        #         self.params.pop(i)
        print(self.params)
        return self.params  # 返回给app

在view.py文件调用支付函数
def View(request):
        if request.META.get('HTTP_X_FORWARDED_FOR'):
            spbill_create_ip = request.META['HTTP_X_FORWARDED_FOR']
        else:
            spbill_create_ip = request.META['REMOTE_ADDR']
        openid = 'ottytthtg0'
        params = WeiXinPay(order_id=‘234243434243243242’, body='充值', total_fee=1,
                           spbill_create_ip=spbill_create_ip, openid=openid).re_finall()
        return JsonResponse(params)