Python uses WeChat SDK to implement payment function

This article mainly introduces the WeChat payment function implemented by Python using WeChat SDK. It analyzes the specific steps and related operating techniques of Python calling the WeChat SDK interface to implement the WeChat payment function in the form of examples. Friends in need can refer to the following

The example in this article describes the WeChat payment function implemented by Python using WeChat SDK. I share it with you for your reference. The details are as follows:

I have been developing the WeChat platform for a while. The v3.37 version of the WeChat payment interface has changed a lot, so I transplanted the php demo to the Python version. In order to It is consistent, so the interface method basically remains unchanged. The advantage of this is that you don’t need to write a demo. You can just look at the official demo of WeChat and copy the gourd.

You can also click hereto download from this site.

I mainly tested the JsApi calling method, and other calling methods were not tested. If you find a bug, please make a pull request, I will be very grateful.

For easy viewing, the code is posted here.

#coding:utf-8
"""
Created on 2014-11-24
@author: http://blog.csdn.net/yueguanghaidao
 * 微信支付帮助库
 * ====================================================
 * 接口分三种类型：
 * 【请求型接口】--Wxpay_client_
 *   统一支付接口类--UnifiedOrder
 *   订单查询接口--OrderQuery
 *   退款申请接口--Refund
 *   退款查询接口--RefundQuery
 *   对账单接口--DownloadBill
 *   短链接转换接口--ShortUrl
 * 【响应型接口】--Wxpay_server_
 *   通用通知接口--Notify
 *   Native支付——请求商家获取商品信息接口--NativeCall
 * 【其他】
 *   静态链接二维码--NativeLink
 *   JSAPI支付--JsApi
 * =====================================================
 * 【CommonUtil】常用工具：
 *   trimString()，设置参数时需要用到的字符处理函数
 *   createNoncestr()，产生随机字符串，不长于32位
 *   formatBizQueryParaMap(),格式化参数，签名过程需要用到
 *   getSign(),生成签名
 *   arrayToXml(),array转xml
 *   xmlToArray(),xml转 array
 *   postXmlCurl(),以post方式提交xml到对应的接口url
 *   postXmlSSLCurl(),使用证书，以post方式提交xml到对应的接口url
"""
import json
import time
import random
import urllib2
import hashlib
import threading
from urllib import quote
import xml.etree.ElementTree as ET
try:
  import pycurl
  from cStringIO import StringIO
except ImportError:
  pycurl = None
class WxPayConf_pub(object):
  """配置账号信息"""
  #=======【基本信息设置】=====================================
  #微信公众号身份的唯一标识。审核通过后，在微信发送的邮件中查看
  APPID = "wx8888888888888888"
  #JSAPI接口中获取openid，审核后在公众平台开启开发模式后可查看
  APPSECRET = "48888888888888888888888888888887"
  #受理商ID，身份标识
  MCHID = "18888887"
  #商户支付密钥Key。审核通过后，在微信发送的邮件中查看
  KEY = "48888888888888888888888888888886"
  #=======【异步通知url设置】===================================
  #异步通知url，商户根据实际开发过程设定
  NOTIFY_URL = "http://******.com/payback"
  #=======【JSAPI路径设置】===================================
  #获取access_token过程中的跳转uri，通过跳转将code传入jsapi支付页面
  JS_API_CALL_URL = "http://******.com/pay/?showwxpaytitle=1"
  #=======【证书路径设置】=====================================
  #证书路径,注意应该填写绝对路径
  SSLCERT_PATH = "/******/cacert/apiclient_cert.pem"
  SSLKEY_PATH = "/******/cacert/apiclient_key.pem"
  #=======【curl超时设置】===================================
  CURL_TIMEOUT = 30
  #=======【HTTP客户端设置】===================================
  HTTP_CLIENT = "CURL" # ("URLLIB", "CURL")
class Singleton(object):
  """单例模式"""
  _instance_lock = threading.Lock()
  def new(cls, *args, **kwargs):
    if not hasattr(cls, "_instance"):
      with cls._instance_lock:
        if not hasattr(cls, "_instance"):
          impl = cls.configure() if hasattr(cls, "configure") else cls
          instance = super(Singleton, cls).new(impl, *args, **kwargs)
          instance.init(*args, **kwargs)
          cls._instance = instance
    return cls._instance
class UrllibClient(object):
  """使用urlib2发送请求"""
  def get(self, url, second=30):
    return self.postXml(None, url, second)
  def postXml(self, xml, url, second=30):
    """不使用证书"""
    data = urllib2.urlopen(url, xml, timeout=second).read()
    return data
  def postXmlSSL(self, xml, url, second=30):
    """使用证书"""
    raise TypeError("please use CurlClient")
class CurlClient(object):
  """使用Curl发送请求"""
  def init(self):
    self.curl = pycurl.Curl()
    self.curl.setopt(pycurl.SSL_VERIFYHOST, False)
    self.curl.setopt(pycurl.SSL_VERIFYPEER, False)
    #设置不输出header
    self.curl.setopt(pycurl.HEADER, False)
  def get(self, url, second=30):
    return self.postXmlSSL(None, url, second=second, cert=False, post=False)
  def postXml(self, xml, url, second=30):
    """不使用证书"""
    return self.postXmlSSL(xml, url, second=second, cert=False, post=True)
  def postXmlSSL(self, xml, url, second=30, cert=True, post=True):
    """使用证书"""
    self.curl.setopt(pycurl.URL, url)
    self.curl.setopt(pycurl.TIMEOUT, second)
    #设置证书
    #使用证书：cert 与 key 分别属于两个.pem文件
    #默认格式为PEM，可以注释
    if cert:
      self.curl.setopt(pycurl.SSLKEYTYPE, "PEM")
      self.curl.setopt(pycurl.SSLKEY, WxPayConf_pub.SSLKEY_PATH)
      self.curl.setopt(pycurl.SSLCERTTYPE, "PEM")
      self.curl.setopt(pycurl.SSLCERT, WxPayConf_pub.SSLKEY_PATH)
    #post提交方式
    if post:
      self.curl.setopt(pycurl.POST, True)
      self.curl.setopt(pycurl.POSTFIELDS, xml)
    buff = StringIO()
    self.curl.setopt(pycurl.WRITEFUNCTION, buff.write)
    self.curl.perform()
    return buff.getvalue()
class HttpClient(Singleton):
  @classmethod
  def configure(cls):
    if pycurl is not None and WxPayConf_pub.HTTP_CLIENT != "URLLIB":
      return CurlClient
    else:
      return UrllibClient
class Common_util_pub(object):
  """所有接口的基类"""
  def trimString(self, value):
    if value is not None and len(value) == 0:
      value = None
    return value
  def createNoncestr(self, length = 32):
    """产生随机字符串，不长于32位"""
    chars = "abcdefghijklmnopqrstuvwxyz0123456789"
    strs = []
    for x in range(length):
      strs.append(chars[random.randrange(0, len(chars))])
    return "".join(strs)
  def formatBizQueryParaMap(self, paraMap, urlencode):
    """格式化参数，签名过程需要使用"""
    slist = sorted(paraMap)
    buff = []
    for k in slist:
      v = quote(paraMap[k]) if urlencode else paraMap[k]
      buff.append("{0}={1}".format(k, v))
    return "&".join(buff)
  def getSign(self, obj):
    """生成签名"""
    #签名步骤一：按字典序排序参数,formatBizQueryParaMap已做
    String = self.formatBizQueryParaMap(obj, False)
    #签名步骤二：在string后加入KEY
    String = "{0}&key={1}".format(String,WxPayConf_pub.KEY)
    #签名步骤三：MD5加密
    String = hashlib.md5(String).hexdigest()
    #签名步骤四：所有字符转为大写
    result_ = String.upper()
    return result_
  def arrayToXml(self, arr):
    """array转xml"""
    xml = ["<xml>"]
    for k, v in arr.iteritems():
      if v.isdigit():
        xml.append("<{0}>{1}</{0}>".format(k, v))
      else:
        xml.append("<{0}><![CDATA[{1}]]></{0}>".format(k, v))
    xml.append("</xml>")
    return "".join(xml)
  def xmlToArray(self, xml):
    """将xml转为array"""
    array_data = {}
    root = ET.fromstring(xml)
    for child in root:
      value = child.text
      array_data[child.tag] = value
    return array_data
  def postXmlCurl(self, xml, url, second=30):
    """以post方式提交xml到对应的接口url"""
    return HttpClient().postXml(xml, url, second=second)
  def postXmlSSLCurl(self, xml, url, second=30):
    """使用证书，以post方式提交xml到对应的接口url"""
    return HttpClient().postXmlSSL(xml, url, second=second)
class JsApi_pub(Common_util_pub):
  """JSAPI支付——H5网页端调起支付接口"""
  code = None  #code码，用以获取openid
  openid = None #用户的openid
  parameters = None #jsapi参数，格式为json
  prepay_id = None #使用统一支付接口得到的预支付id
  curl_timeout = None #curl超时时间
  def init(self, timeout=WxPayConf_pub.CURL_TIMEOUT):
    self.curl_timeout = timeout
  def createOauthUrlForCode(self, redirectUrl):
    """生成可以获得code的url"""
    urlObj = {}
    urlObj["appid"] = WxPayConf_pub.APPID
    urlObj["redirect_uri"] = redirectUrl
    urlObj["response_type"] = "code"
    urlObj["scope"] = "snsapi_base"
    urlObj["state"] = "STATE#wechat_redirect"
    bizString = self.formatBizQueryParaMap(urlObj, False)
    return "https://open.weixin.qq.com/connect/oauth2/authorize?"+bizString
  def createOauthUrlForOpenid(self):
    """生成可以获得openid的url"""
    urlObj = {}
    urlObj["appid"] = WxPayConf_pub.APPID
    urlObj["secret"] = WxPayConf_pub.APPSECRET
    urlObj["code"] = self.code
    urlObj["grant_type"] = "authorization_code"
    bizString = self.formatBizQueryParaMap(urlObj, False)
    return "https://api.weixin.qq.com/sns/oauth2/access_token?"+bizString
  def getOpenid(self):
    """通过curl向微信提交code，以获取openid"""
    url = self.createOauthUrlForOpenid()
    data = HttpClient().get(url)
    self.openid = json.loads(data)["openid"]
    return self.openid
  def setPrepayId(self, prepayId):
    """设置prepay_id"""
    self.prepay_id = prepayId
  def setCode(self, code):
    """设置code"""
    self.code = code
  def getParameters(self):
    """设置jsapi的参数"""
    jsApiObj = {}
    jsApiObj["appId"] = WxPayConf_pub.APPID
    timeStamp = int(time.time())
    jsApiObj["timeStamp"] = "{0}".format(timeStamp)
    jsApiObj["nonceStr"] = self.createNoncestr()
    jsApiObj["package"] = "prepay_id={0}".format(self.prepay_id)
    jsApiObj["signType"] = "MD5"
    jsApiObj["paySign"] = self.getSign(jsApiObj)
    self.parameters = json.dumps(jsApiObj)
    return self.parameters
class Wxpay_client_pub(Common_util_pub):
  """请求型接口的基类"""
  response = None #微信返回的响应
  url = None    #接口链接
  curl_timeout = None #curl超时时间
  def init(self):
    self.parameters = {} #请求参数，类型为关联数组
    self.result = {}   #返回参数，类型为关联数组
  def setParameter(self, parameter, parameterValue):
    """设置请求参数"""
    self.parameters[self.trimString(parameter)] = self.trimString(parameterValue)
  def createXml(self):
    """设置标配的请求参数，生成签名，生成接口参数xml"""
    self.parameters["appid"] = WxPayConf_pub.APPID  #公众账号ID
    self.parameters["mch_id"] = WxPayConf_pub.MCHID  #商户号
    self.parameters["nonce_str"] = self.createNoncestr()  #随机字符串
    self.parameters["sign"] = self.getSign(self.parameters)  #签名
    return self.arrayToXml(self.parameters)
  def postXml(self):
    """post请求xml"""
    xml = self.createXml()
    self.response = self.postXmlCurl(xml, self.url, self.curl_timeout)
    return self.response
  def postXmlSSL(self):
    """使用证书post请求xml"""
    xml = self.createXml()
    self.response = self.postXmlSSLCurl(xml, self.url, self.curl_timeout)
    return self.response
  def getResult(self):
    """获取结果，默认不使用证书"""
    self.postXml()
    self.result = self.xmlToArray(self.response)
    return self.result
class UnifiedOrder_pub(Wxpay_client_pub):
  """统一支付接口类"""
  def init(self, timeout=WxPayConf_pub.CURL_TIMEOUT):
    #设置接口链接
    self.url = "https://api.mch.weixin.qq.com/pay/unifiedorder"
    #设置curl超时时间
    self.curl_timeout = timeout
    super(UnifiedOrder_pub, self).init()
  def createXml(self):
    """生成接口参数xml"""
    #检测必填参数
    if any(self.parameters[key] is None for key in ("out_trade_no", "body", "total_fee", "notify_url", "trade_type")):
      raise ValueError("missing parameter")
    if self.parameters["trade_type"] == "JSAPI" and self.parameters["openid"] is None:
      raise ValueError("JSAPI need openid parameters")
    self.parameters["appid"] = WxPayConf_pub.APPID #公众账号ID
    self.parameters["mch_id"] = WxPayConf_pub.MCHID #商户号
    self.parameters["spbill_create_ip"] = "127.0.0.1" #终端ip
    self.parameters["nonce_str"] = self.createNoncestr() #随机字符串
    self.parameters["sign"] = self.getSign(self.parameters) #签名
    return self.arrayToXml(self.parameters)
  def getPrepayId(self):
    """获取prepay_id"""
    self.postXml()
    self.result = self.xmlToArray(self.response)
    prepay_id = self.result["prepay_id"]
    return prepay_id
class OrderQuery_pub(Wxpay_client_pub):
  """订单查询接口"""
  def init(self, timeout=WxPayConf_pub.CURL_TIMEOUT):
    #设置接口链接
    self.url = "https://api.mch.weixin.qq.com/pay/orderquery"
    #设置curl超时时间
    self.curl_timeout = timeout
    super(OrderQuery_pub, self).init()
  def createXml(self):
    """生成接口参数xml"""
    #检测必填参数
    if any(self.parameters[key] is None for key in ("out_trade_no", "transaction_id")):
      raise ValueError("missing parameter")
    self.parameters["appid"] = WxPayConf_pub.APPID #公众账号ID
    self.parameters["mch_id"] = WxPayConf_pub.MCHID #商户号
    self.parameters["nonce_str"] = self.createNoncestr() #随机字符串
    self.parameters["sign"] = self.getSign(self.parameters) #签名
    return self.arrayToXml(self.parameters)
class Refund_pub(Wxpay_client_pub):
  """退款申请接口"""
  def init(self, timeout=WxPayConf_pub.CURL_TIMEOUT):
    #设置接口链接
    self.url = "https://api.mch.weixin.qq.com/secapi/pay/refund"
    #设置curl超时时间
    self.curl_timeout = timeout
    super(Refund_pub, self).init()
  def createXml(self):
    """生成接口参数xml"""
    if any(self.parameters[key] is None for key in ("out_trade_no", "out_refund_no", "total_fee", "refund_fee", "op_user_id")):
      raise ValueError("missing parameter")
    self.parameters["appid"] = WxPayConf_pub.APPID #公众账号ID
    self.parameters["mch_id"] = WxPayConf_pub.MCHID #商户号
    self.parameters["nonce_str"] = self.createNoncestr() #随机字符串
    self.parameters["sign"] = self.getSign(self.parameters) #签名
    return self.arrayToXml(self.parameters)
  def getResult(self):
    """ 获取结果，使用证书通信(需要双向证书)"""
    self.postXmlSSL()
    self.result = self.xmlToArray(self.response)
    return self.result
class RefundQuery_pub(Wxpay_client_pub):
  """退款查询接口"""
  def init(self, timeout=WxPayConf_pub.CURL_TIMEOUT):
    #设置接口链接
    self.url = "https://api.mch.weixin.qq.com/pay/refundquery"
    #设置curl超时时间
    self.curl_timeout = timeout
    super(RefundQuery_pub, self).init()
  def createXml(self):
    """生成接口参数xml"""
    if any(self.parameters[key] is None for key in ("out_refund_no", "out_trade_no", "transaction_id", "refund_id")):
      raise ValueError("missing parameter")
    self.parameters["appid"] = WxPayConf_pub.APPID #公众账号ID
    self.parameters["mch_id"] = WxPayConf_pub.MCHID #商户号
    self.parameters["nonce_str"] = self.createNoncestr() #随机字符串
    self.parameters["sign"] = self.getSign(self.parameters) #签名
    return self.arrayToXml(self.parameters)
  def getResult(self):
    """ 获取结果，使用证书通信(需要双向证书)"""
    self.postXmlSSL()
    self.result = self.xmlToArray(self.response)
    return self.result
class DownloadBill_pub(Wxpay_client_pub):
  """对账单接口"""
  def init(self, timeout=WxPayConf_pub.CURL_TIMEOUT):
    #设置接口链接
    self.url = "https://api.mch.weixin.qq.com/pay/downloadbill"
    #设置curl超时时间
    self.curl_timeout = timeout
    super(DownloadBill_pub, self).init()
  def createXml(self):
    """生成接口参数xml"""
    if any(self.parameters[key] is None for key in ("bill_date", )):
      raise ValueError("missing parameter")
    self.parameters["appid"] = WxPayConf_pub.APPID #公众账号ID
    self.parameters["mch_id"] = WxPayConf_pub.MCHID #商户号
    self.parameters["nonce_str"] = self.createNoncestr() #随机字符串
    self.parameters["sign"] = self.getSign(self.parameters) #签名
    return self.arrayToXml(self.parameters)
  def getResult(self):
    """获取结果，默认不使用证书"""
    self.postXml()
    self.result = self.xmlToArray(self.response)
    return self.result
class ShortUrl_pub(Wxpay_client_pub):
  """短链接转换接口"""
  def init(self, timeout=WxPayConf_pub.CURL_TIMEOUT):
    #设置接口链接
    self.url = "https://api.mch.weixin.qq.com/tools/shorturl"
    #设置curl超时时间
    self.curl_timeout = timeout
    super(ShortUrl_pub, self).init()
  def createXml(self):
    """生成接口参数xml"""
    if any(self.parameters[key] is None for key in ("long_url", )):
      raise ValueError("missing parameter")
    self.parameters["appid"] = WxPayConf_pub.APPID #公众账号ID
    self.parameters["mch_id"] = WxPayConf_pub.MCHID #商户号
    self.parameters["nonce_str"] = self.createNoncestr() #随机字符串
    self.parameters["sign"] = self.getSign(self.parameters) #签名
    return self.arrayToXml(self.parameters)
  def getShortUrl(self):
    """获取prepay_id"""
    self.postXml()
    prepay_id = self.result["short_url"]
    return prepay_id
class Wxpay_server_pub(Common_util_pub):
  """响应型接口基类"""
  SUCCESS, FAIL = "SUCCESS", "FAIL"
  def init(self):
    self.data = {} #接收到的数据，类型为关联数组
    self.returnParameters = {} #返回参数，类型为关联数组
  def saveData(self, xml):
    """将微信的请求xml转换成关联数组，以方便数据处理"""
    self.data = self.xmlToArray(xml)
  def checkSign(self):
    """校验签名"""
    tmpData = dict(self.data) #make a copy to save sign
    del tmpData[&#39;sign&#39;]
    sign = self.getSign(tmpData) #本地签名
    if self.data[&#39;sign&#39;] == sign:
      return True
    return False
  def getData(self):
    """获取微信的请求数据"""
    return self.data
  def setReturnParameter(self, parameter, parameterValue):
    """设置返回微信的xml数据"""
    self.returnParameters[self.trimString(parameter)] = self.trimString(parameterValue)
  def createXml(self):
    """生成接口参数xml"""
    return self.arrayToXml(self.returnParameters)
  def returnXml(self):
    """将xml数据返回微信"""
    returnXml = self.createXml()
    return returnXml
class Notify_pub(Wxpay_server_pub):
  """通用通知接口"""
class NativeCall_pub(Wxpay_server_pub):
  """请求商家获取商品信息接口"""
  def createXml(self):
    """生成接口参数xml"""
    if self.returnParameters["return_code"] == self.SUCCESS:
      self.returnParameters["appid"] = WxPayConf_pub.APPID #公众账号ID
      self.returnParameters["mch_id"] = WxPayConf_pub.MCHID #商户号
      self.returnParameters["nonce_str"] = self.createNoncestr() #随机字符串
      self.returnParameters["sign"] = self.getSign(self.returnParameters) #签名
    return self.arrayToXml(self.returnParameters)
  def getProductId(self):
    """获取product_id"""
    product_id = self.data["product_id"]
    return product_id
class NativeLink_pub(Common_util_pub):
  """静态链接二维码"""
  url = None #静态链接
  def init(self):
    self.parameters = {} #静态链接参数
  def setParameter(self, parameter, parameterValue):
    """设置参数"""
    self.parameters[self.trimString(parameter)] = self.trimString(parameterValue)
  def createLink(self):
    if any(self.parameters[key] is None for key in ("product_id", )):
      raise ValueError("missing parameter")
    self.parameters["appid"] = WxPayConf_pub.APPID #公众账号ID
    self.parameters["mch_id"] = WxPayConf_pub.MCHID #商户号
    time_stamp = int(time.time())
    self.parameters["time_stamp"] = "{0}".format(time_stamp) #时间戳
    self.parameters["nonce_str"] = self.createNoncestr() #随机字符串
    self.parameters["sign"] = self.getSign(self.parameters) #签名
    bizString = self.formatBizQueryParaMap(self.parameters, false)
    self.url = "weixin://wxpay/bizpayurl?"+bizString
  def getUrl(self):
    """返回链接"""
    self.createLink()
    return self.url
def test():
  c = HttpClient()
  assert c.get("http://www.baidu.com")[:15] == "<!DOCTYPE html>"
  c2 = HttpClient()
  assert id(c) == id(c2)
if name == "main":
  test()

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