# 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sign_type WEIXIN_SIGN_TYPE = 'MD5' # 服务器IP地址 WEIXIN_SPBILL_CREATE_IP = '139.9.148.181' # 微信支付用途 WEIXIN_BODY = u'小程序支付' # 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 = 'https://baoxiu360.top/api/wechat_notify/' class WechatPay(): def __init__(self, appid, mch_id, merchant_key): self.params = { 'appid': appid, 'mch_id': mch_id, 'nonce_str': '', 'sign_type': WEIXIN_SIGN_TYPE, 'body': WEIXIN_BODY, 'out_trade_no': '', 'total_fee': '', 'spbill_create_ip': WEIXIN_SPBILL_CREATE_IP, 'notify_url': WEIXIN_CALLBACK_API + appid + '/', 'trade_type': 'JSAPI' } self.prepay_id = None self.merchant_key = merchant_key def getAppString(self): data = { 'appId': self.params['appid'], 'signType': WEIXIN_SIGN_TYPE, 'package': "prepay_id={}".format(self.prepay_id), 'nonceStr': generate_nonce_str(), 'timeStamp': str(int(time.time())) } data['paySign'] = generate_sign(data, self.merchant_key) data.pop('appId') return data def unifiedOrder(self,out_trade_no,total_fee, openid): self.params['out_trade_no'] = out_trade_no self.params['total_fee'] = int(round(total_fee / 100,0)) self.params['openid'] = openid self.params['nonce_str'] = generate_nonce_str() self.params['sign'] = generate_sign(self.params, self.merchant_key) 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'] class WechatPayNotify(): def __init__(self,params, merchant_key): self.params = params self.merchant_key = merchant_key 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, self.merchant_key): 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, merchant_key): """ 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' % merchant_key return md5(src.encode('utf-8')).hexdigest().upper() def validate_sign(resp_dict, merchant_key): """ 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, merchant_key) 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')