Python实现支付宝当面付之——扫码支付

# ========支付相关配置信息===========
    ALIPAY_INPUT_CHARSET = ‘utf-8‘
    # 商户ID，以2088开头的16位纯数字
    ALIPAY_PARTNER = ‘2088************‘
    # 服务商支付宝账号
    ALIPAY_SELLER_EMAIL = ‘‘
    # 支付结果回调地址
    ALIPAY_NOTIFY_URL = "商家后台回调接口地址"
    # 访问模式,根据自己的服务器是否支持ssl访问，若支持请选择https；若不支持请选择http
    ALIPAY_TRANSPORT = ‘https‘
    #签名加密方式
    SIGN_TYPE = "SHA-1"
    #应用id
    APP_ID = ‘************‘
    #下单api
    precreate_GATEWAY="https://openapi.alipay.com/gateway.do?"

   #1：生成下单请求参数字符串
    def make_payment_request(self,params_dict):
        """
        构造支付请求参数
        :param params_dict:
        :return:
        """
        query_str = self.params_to_query(params_dict,)  # 拼接参数字符串
        sign = self.make_sign(query_str)  # 生成签名
        sign = urllib.quote(sign, safe=‘‘)  #解决中文参数编码问题
        res = "%s&sign=%s" % (query_str, sign)
        return res
    def params_to_query(self,params):
        """
        生成需要签名的字符串
        :param params:
        :return:
        """
        """
        :param params:
        :return:
        """
        query = ""
        dict_items = {}
        for key, value in params.items():
            if isinstance(value, dict) == True:
                dict_items[key] = value
                params[key] = "%s"
        all_str = ‘‘
        for key in sorted(params.keys()): #把参数按key值排序：这是支付宝下单请求的参数格式规定
            all_str = all_str + ‘%s=%s&‘ % (key, params[key])
        all_str = all_str.rstrip(‘&‘)
        biz_content_dict = dict_items[‘biz_content‘]
        content_str = ‘‘
        for key in sorted(biz_content_dict.keys()):
            if isinstance(biz_content_dict[key], basestring) == True:
                content_str = content_str + ‘"%s":"%s",‘ % (key, biz_content_dict[key])
            else:
                content_str = content_str + ‘"%s":%s,‘ % (key, biz_content_dict[key])
        content_str = content_str.rstrip(‘,‘)
        content_str = ‘{‘ + content_str + ‘}‘
        query = all_str % content_str
        return query
    def make_sign(self,para_str):
        """
        生成签名
        :param message:
        :return:
        """
        private_key = OpenSSL.crypto.load_privatekey(OpenSSL.crypto.FILETYPE_PEM, open(
            ‘./路径/private_key.txt‘).read()) #把私钥存到一个文件里，加载出来【尝试过用rsa模块的方法加载私钥字符串，会报格式错误。查看源码得知，需要从文件流加载】
        import sys
        reload(sys)
        sys.setdefaultencoding(‘utf-8‘) #这三句：解决签名方法编码报错
        sign = base64.encodestring(OpenSSL.crypto.sign(private_key, para_str, ‘sha256‘))
        return sign

    #获取二维码url
    def getAlipayUrl(self,orderid,goodsName,goodsPrice,**kwargs):
        # 构建公共参数
        params = {}
        params[‘method‘] = ‘alipay.trade.precreate‘
        params[‘version‘] = ‘1.0‘
        params[‘app_id‘] = self.APP_ID
        params[‘timestamp‘] = datetime.now().strftime(‘%Y-%m-%d %H:%M:%S‘)
        params[‘charset‘] = self.ALIPAY_INPUT_CHARSET
        params[‘notify_url‘] = self.ALIPAY_NOTIFY_URL
        params[‘sign_type‘] = ‘RSA2‘

        # 构建订单参数
        biz_content = {}
        biz_content[‘out_trade_no‘] = orderid  # 订单号
        biz_content[‘subject‘] = goodsName  #商品名
        biz_content[‘total_amount‘] = goodsPrice  # 价格
        params[‘biz_content‘] = biz_content

        #由参数，生成签名，并且拼接得到下单参数字符串
        encode_params = self.make_payment_request(params)
        #下单
        url = self.precreate_GATEWAY + encode_params
        response = requests.get(url)
        #提取下单响应
        body = response.text
        #解析下单响应json字符串
        body_dict = json.loads(body)
        return_msg = body_dict[‘alipay_trade_precreate_response‘][‘msg‘]
        if return_msg == "Success":
                code_url = body_dict[‘alipay_trade_precreate_response‘][‘qr_code‘]
                return code_url
        else:
            print "fail msg=============" + return_msg

    def aliQRCodeNotify(self, request, *args,**kwargs):
        out_trade_no = kwargs.get("out_trade_no")
        trade_status = kwargs.get("trade_status")
       
        #根据trade_status，判断交易结果：交易成功 or 交易关闭
        #根据out_trade_no 更新订单记录信息