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 + "" + 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 requests
import hashlib
import xmltodict
import time
import random
import string
import urllib2
import sys
class 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 xmltodict
from django.http import HttpResponse
def 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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