Python实现微信小程序支付功能

 import requests from config import APPID, SECRET class OpenidUtils(object):  def __init__(self, jscode):   self.url = "https://api.weixin.qq.com/sns/jscode2session"   self.appid = APPID # 小程序id   self.secret = SECRET # 不要跟后面支付的key搞混   self.jscode = jscode # 前端传回的动态jscode  def get_openid(self):   # url一定要拼接，不可用传参方式   url = self.url + "?appid=" + self.appid + "&secret=" + self.secret + "&js_code=" + self.jscode + "&grant_type=authorization_code"   r = requests.get(url)   print(r.json())   openid = r.json()['openid']   return openid

# -*- coding:utf-8 -*-import requestsimport hashlibimport xmltodictimport timeimport randomimport stringimport urllib2import sysclass WX_PayToolUtil(): """ 微信支付工具 """ def __init__(self, APP_ID, MCH_ID, API_KEY, NOTIFY_URL):  self._APP_ID = APP_ID # 小程序ID  self._MCH_ID = MCH_ID # # 商户号  self._API_KEY = API_KEY  self._UFDODER_URL = "https://api.mch.weixin.qq.com/pay/unifiedorder" # 接口链接  self._NOTIFY_URL = NOTIFY_URL # 异步通知 def generate_sign(self, param):   '''生成签名'''   stringA = ''   ks = sorted(param.keys())   # 参数排序   for k in ks:    stringA += (k + '=' + param[k] + '&')   # 拼接商户KEY   stringSignTemp = stringA + "key=" + self._API_KEY   # md5加密,也可以用其他方式   hash_md5 = hashlib.md5(stringSignTemp.encode('utf8'))   sign = hash_md5.hexdigest().upper()   return sign ''' # python2另外一种实现方法 def generate_sign(self, params):  ret = []  for k in sorted(params.keys()):   if (k != 'sign') and (k != '') and (params[k] is not None):    ret.append('%s=%s' % (k, params[k]))  params_str = '&'.join(ret)  params_str = '%(params_str)s&key=%(partner_key)s' % {'params_str': params_str, 'partner_key': key}  reload(sys)  sys.setdefaultencoding('utf8')  params_str = hashlib.md5(params_str.encode('utf-8')).hexdigest()  sign = params_str.upper()  return sign ''' def getPayUrl(self, orderid, openid, goodsPrice, **kwargs):  """向微信支付端发出请求，获取url"""  key = self._API_KEY  nonce_str = ''.join(random.sample(string.letters + string.digits, 30)) # 生成随机字符串，小于32位  params = {   'appid': self._APP_ID, # 小程序ID   'mch_id': self._MCH_ID, # 商户号   'nonce_str': nonce_str, # 随机字符串   "body": '测试订单', # 支付说明   'out_trade_no': orderid, # 生成的订单号   'total_fee': str(goodsPrice), # 标价金额   'spbill_create_ip': "127.0.0.1", # 小程序不能获取客户ip，web用socekt实现   'notify_url': self._NOTIFY_URL,   'trade_type': "JSAPI", # 支付类型   "openid": openid, # 用户id   }  # 生成签名  params['sign'] = self.generate_sign(params)  # python3一种写法  param = {'root': params}  xml = xmltodict.unparse(param)  response = requests.post(self._UFDODER_URL, data=xml.encode('utf-8'), headers={'Content-Type': 'text/xml'})  # xml 2 dict  msg = response.text  xmlmsg = xmltodict.parse(msg)  # 4. 获取prepay_id  if xmlmsg['xml']['return_code'] == 'SUCCESS':   if xmlmsg['xml']['result_code'] == 'SUCCESS':    prepay_id = xmlmsg['xml']['prepay_id']    # 时间戳    timeStamp = str(int(time.time()))    # 5. 五个参数    data = {     "appId": self._APP_ID,     "nonceStr": nonce_str,     "package": "prepay_id=" + prepay_id,     "signType": 'MD5',     "timeStamp": timeStamp,    }    # 6. paySign签名    paySign = self.generate_sign(data)    data["paySign"] = paySign # 加入签名    # 7. 传给前端的签名后的参数    return data  # python2一种写法  '''  request_xml_str = '<xml>'  for key, value in params.items():   if isinstance(value, str):    request_xml_str = '%s<%s><![CDATA[%s]]></%s>' % (request_xml_str, key, value, key,)   else:    request_xml_str = '%s<%s>%s</%s>' % (request_xml_str, key, value, key,)  request_xml_str = '%s</xml>' % request_xml_str  # 向微信支付发出请求，并提取回传数据  res = urllib2.Request(self._UFDODER_URL, data=request_xml_str.encode("utf-8"))  res_data = urllib2.urlopen(res)  res_read = res_data.read()  doc = xmltodict.parse(res_read)  return_code = doc['xml']['return_code']  if return_code == "SUCCESS":   result_code = doc['xml']['result_code']   if result_code == "SUCCESS":    doc = doc['xml']    data = {     "appId": self._APP_ID,     "nonceStr": nonce_str,     "package": "prepay_id=" + doc["prepay_id"],     "signType": 'MD5',     "timeStamp": str(int(time.time())),    }    # paySign签名    paySign = self.generate_sign(data)    data["paySign"] = paySign # 加入签名    return data   else:    err_des = doc['xml']['err_code_des']    return err_des   else:   fail_des = doc['xml']['return_msg']   return fail_des  '''

# 统一下单回调处理import xmltodictfrom django.http import HttpResponsedef payback(request): msg = request.body.decode('utf-8') xmlmsg = xmltodict.parse(msg) return_code = xmlmsg['xml']['return_code'] if return_code == 'FAIL':  # 官方发出错误  return HttpResponse("""<xml><return_code><![CDATA[FAIL]]></return_code>       <return_msg><![CDATA[Signature_Error]]></return_msg></xml>""",       content_type='text/xml', status=200) elif return_code == 'SUCCESS':  # 拿到这次支付的订单号  out_trade_no = xmlmsg['xml']['out_trade_no']  # 根据需要处理业务逻辑  return HttpResponse("""<xml><return_code><![CDATA[SUCCESS]]></return_code>       <return_msg><![CDATA[OK]]></return_msg></xml>""",       content_type='text/xml', status=200)

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