ly_baoxiu_admin/apps/WeChatResponse.py

# coding=utf-8

import uuid
import requests
import json
import xmltodict
import time
from hashlib import md5
from django.conf import settings

from utils.exceptions import CustomError

# 微信支付APP_ID
WEIXIN_APP_ID = settings.WECHAT['appid']
# 微信支付MCH_ID 【登录账号】
WEIXIN_MCH_ID = settings.WECHAT['mchid']
# 微信支付sign_type
WEIXIN_SIGN_TYPE = 'MD5'
# 服务器IP地址
WEIXIN_SPBILL_CREATE_IP = settings.WECHAT['spbill_create_ip']
# 微信支付用途
WEIXIN_BODY = u'燎原云报修'
# 微信KEY值 【API密钥】
WEIXIN_KEY = settings.WECHAT['merchant_key']
# 微信统一下单URL
WEIXIN_UNIFIED_ORDER_URL = 'https://api.mch.weixin.qq.com/pay/unifiedorder'

# 微信查询订单URL
WEIXIN_QUERY_ORDER_URL = 'https://api.mch.weixin.qq.com/pay/orderquery'

# 微信支付回调API
WEIXIN_CALLBACK_API = settings.WECHAT['notify_url']


class WeChatResponse():

    def __init__(self):
        self.params = {
            'appid': WEIXIN_APP_ID,
            'mch_id': WEIXIN_MCH_ID,
            'nonce_str': '',
            'sign_type': WEIXIN_SIGN_TYPE,
            'sign': '',
            'out_trade_no': '',
        }
        self.prepay_id = None

    def getAppString(self):
        data = {
            'appid': self.params['appid'],
            'partnerid': self.params['mch_id'],
            'prepayid': self.prepay_id,
            'package': "prepay_id={}".format(self.prepay_id),
            'noncestr': generate_nonce_str(),
            'timestamp': str(int(time.time()))
        }
        data['sign'] = generate_sign(data)
        return data

    # 查询订单
    def orderquery(self, out_trade_no):
        self.params['out_trade_no'] = out_trade_no
        self.params['nonce_str'] = generate_nonce_str()
        self.params['sign'] = generate_sign(self.params)
        data = xmltodict.unparse({'xml': self.params}, pretty=True, full_document=False).encode('utf-8')
        headers = {'Content-Type': 'application/xml'}
        res = requests.post(WEIXIN_QUERY_ORDER_URL, data=data, headers=headers)
        if res.status_code != 200:
            raise CustomError(u'微信请求失败！')
        result = json.loads(json.dumps(xmltodict.parse(res.content)))

        if result['xml']['return_code'] != 'SUCCESS':
            raise CustomError(u'微信通信失败！[%s]' % result['xml']['return_msg'])
        if result['xml']['trade_state'] != 'SUCCESS':
            raise CustomError(u'微信交易状态！[%s]' % (result['xml']['trade_state_desc']))

        return result['xml']['total_fee']

    def unifiedOrder(self, out_trade_no, total_fee):
        self.params['out_trade_no'] = out_trade_no
        self.params['total_fee'] = int(round(total_fee * 100, 0))
        self.params['nonce_str'] = generate_nonce_str()
        self.params['body'] = WEIXIN_BODY
        self.params['spbill_create_ip'] = WEIXIN_SPBILL_CREATE_IP
        self.params['notify_url'] = WEIXIN_CALLBACK_API
        self.params['trade_type'] = 'NATIVE'
        self.params['sign'] = generate_sign(self.params)
        data = xmltodict.unparse({'xml': self.params}, pretty=True, full_document=False).encode('utf-8')

        headers = {'Content-Type': 'application/xml'}
        res = requests.post(WEIXIN_UNIFIED_ORDER_URL, data=data, headers=headers)

        if res.status_code != 200:
            raise CustomError(u'微信请求失败！')

        result = json.loads(json.dumps(xmltodict.parse(res.content)))
        if result['xml']['return_code'] != 'SUCCESS':
            raise CustomError(u'微信通信失败！[%s]' % result['xml']['return_msg'])
        if result['xml']['result_code'] != 'SUCCESS':
            raise CustomError(u'微信交易失败！[%s:%s]' % (result['xml']['err_code'], result['xml']['err_code_des']))

        self.prepay_id = result['xml']['prepay_id']
        return result['xml']['code_url']


class WechatPayNotify():
    def __init__(self, params):
        self.params = params

    def handle(self):
        resp_dict = json.loads(json.dumps(xmltodict.parse(self.params)))['xml']
        return_code = resp_dict['return_code']

        if return_code != 'SUCCESS':
            return None

        if not validate_sign(resp_dict):
            return None

        return resp_dict

    @staticmethod
    def response_ok():
        return_info = {
            'return_code': 'SUCCESS',
            'return_msg': 'OK'
        }
        return generate_response_data(return_info)

    @staticmethod
    def response_fail():
        return_info = {
            'return_code': 'FAIL',
            'return_msg': 'FAIL'
        }
        return generate_response_data(return_info)


def generate_nonce_str():
    """
    生成随机字符串
    """
    return str(uuid.uuid4()).replace('-', '')


def generate_sign(params):
    """
    生成md5签名的参数
    """
    if 'sign' in params:
        params.pop('sign')
    src = '&'.join(['%s=%s' % (k, v) for k, v in sorted(params.items())]) + '&key=%s' % WEIXIN_KEY
    return md5(src.encode('utf-8')).hexdigest().upper()


def validate_sign(resp_dict):
    """
    验证微信返回的签名
    """
    if 'sign' not in resp_dict:
        return False
    wx_sign = resp_dict['sign']
    sign = generate_sign(resp_dict)
    if sign == wx_sign:
        return True
    return False


def generate_response_data(resp_dict):
    """
    字典转xml
    """
    return xmltodict.unparse({'xml': resp_dict}, pretty=True, full_document=False).encode('utf-8')