Django1.11配合uni-app发起微信支付的实现

uni.login({
          provider: 'weixin',
          success: function(loginRes) {
            let code = loginRes.code;
            if (!_this.isCanUse) {
              //非第一次授权获取用户信息
              uni.getUserInfo({
                provider: 'weixin',
                success: function(infoRes) { 
  　　　　　　　　　　　　　　　　　　　　　　//获取用户信息后向调用信息更新方法
                  _this.nickName = infoRes.userInfo.nickName; //昵称
                  _this.avatarUrl = infoRes.userInfo.avatarUrl; //头像
                    _this.updateUserInfo();//调用更新信息方法
                }
              });
            }
      
            //2.将用户登录code传递到后台置换用户SessionKey、OpenId等信息
            uni.request({
              url: 'http://127.0.0.1:8000/users/',
              data: {
                code: code,
              },
              method: 'GET',
              header: {
                'content-type': 'application/json' 
              },
              success: (res) => {
                console.log(res.data)
                if ( res.data.state== 1001) {
                  console.log("新注册的用户！")
                  _this.OpenId = res.data.openid;
                } else{
                  _this.OpenId = res.data.openid;
                  console.log("注册过的用户！开始设置本地缓存！")
                  console.log(res.data[0].id)
                  if ( res.data[0].id ) {
                    //这里获得登陆状态，然后根据登陆状态来改变用户按钮信息！！！！
                  } else{
                    
                  };
                  _this.user_id = res.data[0].id
                  uni.setStorage({
                    key: 'user',
                    data: res.data,
                    success: function () {
                      console.log('设置缓存成功');
                    }
                  });
                  // _this.gotoshopping()
                  // uni.reLaunch({//信息更新成功后跳转到小程序首页
                  //   url: '/pages/shopping/shopping'
                  // });
                }
                //openId、或SessionKdy存储//隐藏loading
                uni.hideLoading();
              }
            });
          },
        });

if request.GET.get("code"):
      ret = {"state": 1000}
      code = request.GET.get("code")

      url = "https://api.weixin.qq.com/sns/jscode2session"
      appid = "xxxxxxxxxxxxx"
      secret = "xxxxxxxxxxxxxxxxxxxxx"

      # url一定要拼接，不可用传参方式
      url = url + "&＃63;appid=" + appid + "&secret=" + secret + "&js_code=" + code + "&grant_type=authorization_code"
      import requests
      r = requests.get(url)
      print("======", r.json())
      openid = r.json()['openid']
      user = users.objects.filter(openid=openid).all()
      if not user:
        ret["state"] = 1001
        ret["msg"] = "用户第一次登陆"
        ret["openid"] = openid
        return Response(ret)
      else:
        serializer = self.get_serializer(user, many=True)
        return Response(serializer.data)

# 微信支付的配置参数
client_appid = 'xxxxxxxxxxxxxx' # 小程序appid
client_secret = 'xxxxxxxxxxxxxxxxxxxxxxxxxxx' # 小程序secret

Mch_id = 'xxxxxxxxxxx' # 商户号
Mch_key = 'xxxxxxxxxxxxxxxxxxx' # 商户Key
order_url = 'https://api.mch.weixin.qq.com/pay/unifiedorder' # 订单地址

router = routers.DefaultRouter()
router.register("users", views.UsersViewSet)
router.register("goods", views.GoodsViewSet)
router.register("comments", views.CommentsViewSet)
router.register("payOrder", views.OrdersViewSet) #这个就是微信支付的接口


urlpatterns = [
url(r'^admin/', admin.site.urls),
url(r'', include(router.urls)),

]+ static(settings.STATIC_URL, document_root=settings.STATIC_ROOT)
urlpatterns += static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)

class OrdersViewSet(viewsets.ModelViewSet):
  queryset = Order.objects.all()
  serializer_class = OrderModelSerializer

  def create(self, request, *args, **kwargs):
    if request.data.get("user_id"):
      from goods.wxpay.wxpay import payOrder
      data = payOrder(request)
      print(data)
      return Response(data)
    else:
      serializer = self.get_serializer(data=request.data)
      serializer.is_valid(raise_exception=True)
      self.perform_create(serializer)
      headers = self.get_success_headers(serializer.data)
      return Response(serializer.data, status=status.HTTP_201_CREATED, headers=headers)

  def perform_create(self, serializer):
    serializer.save()

  def get_success_headers(self, data):
    try:
      return {'Location': str(data[api_settings.URL_FIELD_NAME])}
    except (TypeError, KeyError):
      return {}

# -*- coding: utf-8 -*-
from .config import client_appid, client_secret, Mch_id, Mch_key, order_url
import hashlib
import datetime
import xml.etree.ElementTree as ET
import requests
from ..models import users


# 生成签名的函数
def paysign(appid, body, mch_id, nonce_str, notify_url, openid, out_trade_no, spbill_create_ip, total_fee):
  ret = {
    "appid": appid,
    "body": body,
    "mch_id": mch_id,
    "nonce_str": nonce_str,
    "notify_url": notify_url,
    "openid": openid,
    "out_trade_no": out_trade_no,
    "spbill_create_ip": spbill_create_ip,
    "total_fee": total_fee,
    "trade_type": 'JSAPI'
  }
  print(ret)
  # 处理函数，对参数按照key=value的格式，并按照参数名ASCII字典序排序
  stringA = '&'.join(["{0}={1}".format(k, ret.get(k)) for k in sorted(ret)])
  stringSignTemp = '{0}&key={1}'.format(stringA, Mch_key)
  sign = hashlib.md5(stringSignTemp.encode("utf-8")).hexdigest()
  print(sign.upper())
  return sign.upper()


# 生成随机字符串
def getNonceStr():
  import random
  data = "123456789zxcvbnmasdfghjklqwertyuiopZXCVBNMASDFGHJKLQWERTYUIOP"
  nonce_str = ''.join(random.sample(data, 30))
  return nonce_str


# 生成商品订单号
def getWxPayOrdrID():
  date = datetime.datetime.now()
  # 根据当前系统时间来生成商品订单号。时间精确到微秒
  payOrdrID = date.strftime("%Y%m%d%H%M%S%f")

  return payOrdrID


# 获取全部参数信息，封装成xml
def get_bodyData(openid, client_ip, price):
  body = 'Mytest' # 商品描述
  notify_url = 'https://127.0.0.1:8000/payOrder/' # 支付成功的回调地址 可访问 不带参数
  nonce_str = getNonceStr() # 随机字符串
  out_trade_no = getWxPayOrdrID() # 商户订单号
  total_fee = str(price) # 订单价格 单位是 分

  # 获取签名
  sign = paysign(client_appid, body, Mch_id, nonce_str, notify_url, openid, out_trade_no, client_ip, total_fee)

  bodyData = ''
  bodyData += '' + client_appid + '' # 小程序ID
  bodyData += '' + body + '' # 商品描述
  bodyData += '' + Mch_id + '' # 商户号
  bodyData += '' + nonce_str + '' # 随机字符串
  bodyData += '' + notify_url + '' # 支付成功的回调地址
  bodyData += '' + openid + '' # 用户标识
  bodyData += '' + out_trade_no + '' # 商户订单号
  bodyData += '' + client_ip + '' # 客户端终端IP
  bodyData += '' + total_fee + '' # 总金额 单位为分
  bodyData += 'JSAPI' # 交易类型 小程序取值如下：JSAPI
  bodyData += '' + sign + ''
  bodyData += ''

  return bodyData


def xml_to_dict(xml_data):
  '''
  xml to dict
  :param xml_data:
  :return:
  '''
  xml_dict = {}
  root = ET.fromstring(xml_data)
  for child in root:
    xml_dict[child.tag] = child.text
  return xml_dict


def dict_to_xml(dict_data):
  '''
  dict to xml
  :param dict_data:
  :return:
  '''
  xml = [""]
  for k, v in dict_data.iteritems():
    xml.append("<{0}>{1}".format(k, v))
  xml.append("")
  return "".join(xml)


# 获取返回给小程序的paySign
def get_paysign(prepay_id, timeStamp, nonceStr):
  pay_data = {
    'appId': client_appid,
    'nonceStr': nonceStr,
    'package': "prepay_id=" + prepay_id,
    'signType': 'MD5',
    'timeStamp': timeStamp
  }
  stringA = '&'.join(["{0}={1}".format(k, pay_data.get(k)) for k in sorted(pay_data)])
  stringSignTemp = '{0}&key={1}'.format(stringA, Mch_key)
  sign = hashlib.md5(stringSignTemp.encode("utf-8")).hexdigest()
  return sign.upper()


# 统一下单支付接口
def payOrder(request):
  import time
  # 获取价格,和用户是谁
  price = request.data.get("price")
  user_id = request.data.get("user_id")

  # 获取客户端ip
  client_ip, port = request.get_host().split(":")

  # 获取小程序openid
  openid = users.objects.get(id=user_id).openid

  # 请求微信的url
  url = order_url

  # 拿到封装好的xml数据
  body_data = get_bodyData(openid, client_ip, price)

  # 获取时间戳
  timeStamp = str(int(time.time()))

  # 请求微信接口下单
  respOne= requests.post(url, body_data.encode("utf-8"), headers={'Content-Type': 'application/xml'})

  # 回复数据为xml,将其转为字典
  cOntent= xml_to_dict(respone.content)
  print(content)
  # 返回给调用函数的数据
  ret = {"state": 1000}
  if content["return_code"] == 'SUCCESS':
    # 获取预支付交易会话标识
    prepay_id = content.get("prepay_id")
    # 获取随机字符串
    nOnceStr= content.get("nonce_str")

    # 获取paySign签名，这个需要我们根据拿到的prepay_id和nonceStr进行计算签名
    paySign = get_paysign(prepay_id, timeStamp, nonceStr)

    # 封装返回给前端的数据
    data = {"prepay_id": prepay_id, "nonceStr": nonceStr, "paySign": paySign, "timeStamp": timeStamp}
    print('=========',data)

    ret["msg"] = "成功"
    return data

  else:
    ret["state"] = 1001
    ret["msg"] = "失败"
    return ret

pay(){
        uni.request({
          url: 'http://127.0.0.1:8000/payOrder/',
          method: 'POST',
          header: {
            'content-type': 'application/json'
          },
          data: {
            user_id:this.user_id,
            price:128
          },
          success: res => {
            console.log("success")
            console.log(res.data)
            
            uni.requestPayment({
            provider: 'wxpay',
            
            timeStamp: res.data.timeStamp,
            nonceStr: res.data.nonceStr,
            package: 'prepay_id='+String(res.data.prepay_id),
            signType: 'MD5',
            paySign: res.data.paySign,
            
            success: function (res) {
              console.log('success:' + JSON.stringify(res));
              // 支付成功，给后台发送数据，保存订单
              
            },
            fail: function (err) {
              console.log('fail:' + JSON.stringify(err));
              // 支付失败，给后台发送数据，保存订单
            }
            });

            
            
          },
          fail: (res) => {
            console.log("fail")
            console.log(res)
          },
          complete: () => {}
        });
        
        
      }