在小程序初次加载的时候就已经获取(详情见 小程序登录)

1.商品信息由小程序端提供

2.提供支付统一下单接口所需参数

<button bind:tap="pay">支付</button>

Page({

pay:function(){

    wx.request({

      url: "http://127.0.0.1:8000/pay/",

      method: "POST",

      data:{"login_key":wx.getStorageSync("login_key")},

      header: { "content-type": "application/json" },

      success: function (e) {

        console.log(e)

        // 签权调起支付

        wx.requestPayment({

          'timeStamp': e.data.data.timeStamp,

          'nonceStr': e.data.data.nonceStr,

          'package': e.data.data.package,

          'signType': e.data.data.signType,

          'paySign': e.data.data.paySign,

          'success': function (res)

           {

             console.log(res,"成功")

            },

          'fail': function (res)

          {

            console.log("支付失败",res)

           },

        })

      }

    })

  },

})

wx

    ├── settings.py     # 小程序id,code2Session等配置

    ├── wx_login.py     # 用于调用code2Session拿到openid等

    └── WXBizDataCrypt.py   # 获取用户授权信息的解密算法,官方下载

AppId="..."

AppSecret="..."

code2Session="https://api.weixin.qq.com/sns/jscode2session?appid={}&secret={}&js_code={}&grant_type=authorization_code"


pay_mchid ='...'


pay_apikey = '...'

from rest_framework.views import  APIView

from  rest_framework.response import  Response

from django.core.cache import cache

import hashlib,time

import random

from app01.wx import settings

import requests

class Pay(APIView):

    def post(self,request):

        param=request.data

        if param.get("login_key"):
            #从redis中拿到小程序端login_key所对应得opendi&session_key值

            openid,session_key=cache.get(param.get("login_key")).split("&")

            self.openid=openid

            # 获取用户IP

            # 1.如果是Nginx做的负载就要HTTP_X_FORWARDED_FOR

            if request.META.get('HTTP_X_FORWARDED_FOR'):

                self.ip =request.META['HTTP_X_FORWARDED_FOR']

            else:

                # 2.如果没有用Nginx就用REMOTE_ADDR

                self.ip = request.META['REMOTE_ADDR']

            # 调用 生成商户订单 方法

            data = self.pay()

            return Response({"code":200,"msg":"ok","data":data})

        else:

            return Response({"code":200,"msg":"缺少参数"})
</span><span style="color: #0000ff;">def</span><span style="color: #000000;"> get_str(self):

    str_all</span>=<span style="color: #800000;">"</span><span style="color: #800000;">1234567890abcdefghjklmasdwery</span><span style="color: #800000;">"  # 注意 开发活动功能时, 去掉1,i,0,o</span><span style="color: #000000;">

    nonce_str</span>=<span style="color: #800000;">""</span>.join(random.sample(str_all,20<span style="color: #000000;">))

    </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> nonce_str

</span><span style="color: #0000ff;">def</span><span style="color: #000000;"> get_order(self):

    order_id</span>=str(time.strftime(<span style="color: #800000;">"</span><span style="color: #800000;">%Y%m%d%H%M%S</span><span style="color: #800000;">"</span><span style="color: #000000;">))

    </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> order_id

</span><span style="color: #008000;">#</span><span style="color: #008000;"> 处理返回预付单方法</span>

<span style="color: #0000ff;">def</span><span style="color: #000000;"> xml_to_dict(self,data):

    </span><span style="color: #0000ff;">import</span><span style="color: #000000;"> xml.etree.ElementTree as ET

    xml_dict</span>=<span style="color: #000000;">{}

    data_dic</span>=<span style="color: #000000;">ET.fromstring(data)

    </span><span style="color: #0000ff;">for</span> item <span style="color: #0000ff;">in</span><span style="color: #000000;"> data_dic:

        xml_dict[item.tag]</span>=<span style="color: #000000;">item.text

    </span><span style="color: #0000ff;">return</span><span style="color: #000000;">  xml_dict

</span><span style="color: #008000;">#</span><span style="color: #008000;"> 获取sign签名方法</span>

<span style="color: #0000ff;">def</span><span style="color: #000000;"> get_sign(self):

    data_dic </span>=<span style="color: #000000;"> {

        </span><span style="color: #800000;">"</span><span style="color: #800000;">nonce_str</span><span style="color: #800000;">"</span><span style="color: #000000;">: self.nonce_str,

        </span><span style="color: #800000;">"</span><span style="color: #800000;">out_trade_no</span><span style="color: #800000;">"</span><span style="color: #000000;">: self.out_trade_no,

        </span><span style="color: #800000;">"</span><span style="color: #800000;">spbill_create_ip</span><span style="color: #800000;">"</span><span style="color: #000000;">: self.ip,

        </span><span style="color: #800000;">"</span><span style="color: #800000;">notify_url</span><span style="color: #800000;">"</span><span style="color: #000000;">: self.notify_url,

        </span><span style="color: #800000;">"</span><span style="color: #800000;">openid</span><span style="color: #800000;">"</span><span style="color: #000000;">: self.openid,

        </span><span style="color: #800000;">"</span><span style="color: #800000;">body</span><span style="color: #800000;">"</span><span style="color: #000000;">: self.body,

        </span><span style="color: #800000;">"</span><span style="color: #800000;">trade_type</span><span style="color: #800000;">"</span>: <span style="color: #800000;">"</span><span style="color: #800000;">JSAPI</span><span style="color: #800000;">"</span><span style="color: #000000;">,

        </span><span style="color: #800000;">"</span><span style="color: #800000;">appid</span><span style="color: #800000;">"</span><span style="color: #000000;">: self.appid,

        </span><span style="color: #800000;">"</span><span style="color: #800000;">total_fee</span><span style="color: #800000;">"</span><span style="color: #000000;">: self.total_fee,

        </span><span style="color: #800000;">"</span><span style="color: #800000;">mch_id</span><span style="color: #800000;">"</span><span style="color: #000000;">: self.mch_id

    }

    sign_str </span>= <span style="color: #800000;">"</span><span style="color: #800000;">&amp;</span><span style="color: #800000;">"</span>.join([f<span style="color: #800000;">"</span><span style="color: #800000;">{k}={data_dic[k]}</span><span style="color: #800000;">"</span> <span style="color: #0000ff;">for</span> k <span style="color: #0000ff;">in</span><span style="color: #000000;"> sorted(data_dic)])

    sign_str </span>= f<span style="color: #800000;">"</span><span style="color: #800000;">{sign_str}&amp;key={settings.pay_apikey}</span><span style="color: #800000;">"</span><span style="color: #000000;">

    md5 </span>=<span style="color: #000000;"> hashlib.md5()

    md5.update(sign_str.encode(</span><span style="color: #800000;">"</span><span style="color: #800000;">utf-8</span><span style="color: #800000;">"</span><span style="color: #000000;">))

    </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> md5.hexdigest().upper()

</span><span style="color: #ff0000;"># 1.生成商户订单 提供 支付统一下单 所需参数</span>

<span style="color: #0000ff;">def</span><span style="color: #000000;"> pay(self):

    self.appid</span>=<span style="color: #000000;">settings.AppId

    self.mch_id</span>=<span style="color: #000000;">settings.pay_mchid

    self.nonce_str</span>=<span style="color: #000000;">self.get_str()

    self.body</span>=<span style="color: #800000;">"商品名</span><span style="color: #800000;">"</span>  <span style="color: #008000;">#</span><span style="color: #008000;"> 商品名一般由小程序端传到后端</span>

    self.out_trade_no=<span style="color: #000000;">self.get_order()

    self.total_fee</span>=1<span style="color: #000000;">

    self.spbill_create_ip</span>=<span style="color: #000000;">self.ip

    self.notify_url</span>=<span style="color: #800000;">"</span><span style="color: #800000;">http://www.baidu.com</span><span style="color: #800000;">"</span><span style="color: #000000;">

    self.trade_type</span>=<span style="color: #800000;">"</span><span style="color: #800000;">JSAPI</span><span style="color: #800000;">"</span><span style="color: #000000;">

    self.sign </span>= self.get_sign()  <span style="color: #008000;">#</span><span style="color: #008000;"> 获取sign 签名</span>

    data=f<span style="color: #800000;">'''</span><span style="color: #800000;">

    &lt;xml&gt;

           &lt;appid&gt;{self.appid}&lt;/appid&gt;

           &lt;body&gt;{ self.body}&lt;/body&gt;

           &lt;mch_id&gt;{self.mch_id}&lt;/mch_id&gt;

           &lt;nonce_str&gt;{self.nonce_str}&lt;/nonce_str&gt;

           &lt;notify_url&gt;{self.notify_url}&lt;/notify_url&gt;

           &lt;openid&gt;{self.openid}&lt;/openid&gt;

           &lt;out_trade_no&gt;{self.out_trade_no}&lt;/out_trade_no&gt;

           &lt;spbill_create_ip&gt;{self.spbill_create_ip}&lt;/spbill_create_ip&gt;

           &lt;total_fee&gt;{self.total_fee}&lt;/total_fee&gt;

           &lt;trade_type&gt;{self.trade_type}&lt;/trade_type&gt;

           &lt;sign&gt;{self.sign}&lt;/sign&gt;

    &lt;/xml&gt;

    </span><span style="color: #800000;">'''</span>

    <span style="color: #ff0000;"># 2.支付统一下单</span>

    url=<span style="color: #800000;">"</span><span style="color: #800000;">https://api.mch.weixin.qq.com/pay/unifiedorder</span><span style="color: #800000;">"</span>

    <span style="color: #ff0000;"># 3.返回预付单信息</span>

    response=requests.post(url,data.encode(<span style="color: #800000;">"</span><span style="color: #800000;">utf-8</span><span style="color: #800000;">"</span>),headers={<span style="color: #800000;">"</span><span style="color: #800000;">content-type</span><span style="color: #800000;">"</span>:<span style="color: #800000;">"</span><span style="color: #800000;">application/xml</span><span style="color: #800000;">"</span><span style="color: #000000;">})

    res_data</span>=<span style="color: #000000;">self.xml_to_dict(response.content)

    data</span>=self.two_sign(res_data[<span style="color: #800000;">"</span><span style="color: #800000;">prepay_id</span><span style="color: #800000;">"</span><span style="color: #000000;">])

    </span><span style="color: #0000ff;">return</span><span style="color: #000000;">  data

</span><span style="color: #ff0000;"># 4.将组合数据再次签名</span>

<span style="color: #0000ff;">def</span><span style="color: #000000;"> two_sign(self,prepay_id):

    timeStamp</span>=<span style="color: #000000;">str(int(time.time()))

    nonceStr</span>=<span style="color: #000000;">self.get_str()

    data_dict</span>=<span style="color: #000000;">{

        </span><span style="color: #800000;">"</span><span style="color: #800000;">appId</span><span style="color: #800000;">"</span><span style="color: #000000;">:settings.AppId,

        </span><span style="color: #800000;">"</span><span style="color: #800000;">timeStamp</span><span style="color: #800000;">"</span><span style="color: #000000;">:timeStamp,

        </span><span style="color: #800000;">"</span><span style="color: #800000;">nonceStr</span><span style="color: #800000;">"</span><span style="color: #000000;">:nonceStr,

        </span><span style="color: #800000;">"</span><span style="color: #800000;">package</span><span style="color: #800000;">"</span>:f<span style="color: #800000;">"</span><span style="color: #800000;">prepay_id={prepay_id}</span><span style="color: #800000;">"</span><span style="color: #000000;">,

        </span><span style="color: #800000;">"</span><span style="color: #800000;">signType</span><span style="color: #800000;">"</span>:<span style="color: #800000;">"</span><span style="color: #800000;">MD5</span><span style="color: #800000;">"</span><span style="color: #000000;">

    }

    sign_str </span>= <span style="color: #800000;">"</span><span style="color: #800000;">&amp;</span><span style="color: #800000;">"</span>.join([f<span style="color: #800000;">"</span><span style="color: #800000;">{k}={data_dict[k]}</span><span style="color: #800000;">"</span> <span style="color: #0000ff;">for</span> k <span style="color: #0000ff;">in</span><span style="color: #000000;"> sorted(data_dict)])

    sign_str </span>= f<span style="color: #800000;">"</span><span style="color: #800000;">{sign_str}&amp;key={settings.pay_apikey}</span><span style="color: #800000;">"</span><span style="color: #000000;">

    md5 </span>=<span style="color: #000000;"> hashlib.md5()

    md5.update(sign_str.encode(</span><span style="color: #800000;">"</span><span style="color: #800000;">utf-8</span><span style="color: #800000;">"</span><span style="color: #000000;">))

    sign</span>=<span style="color: #000000;">md5.hexdigest().upper()

    data_dict[</span><span style="color: #800000;">"</span><span style="color: #800000;">paySign</span><span style="color: #800000;">"</span>]=<span style="color: #000000;">sign

    data_dict.pop(</span><span style="color: #800000;">"</span><span style="color: #800000;">appId</span><span style="color: #800000;">"</span><span style="color: #000000;">)

    </span><span style="color: #ff0000;"># 5.返回支付参数到小程序端,小程序端获取所需参数向微信服务器发送 调起支付 方法</span>

    <span style="color: #0000ff;">return</span>  data_dict</pre>

url(r'^pay/',views.Pay.as_view())