alipay_public_2048.txt
 -----BEGIN PUBLIC KEY----- # 加上这行
 支付宝的公钥
 -----END PUBLIC KEY----- # 同上
 
app_private_2048.txt
 -----BEGIN PUBLIC KEY----- #同上
 应用的私钥
 -----END PUBLIC KEY----- # 同上

from datetime import datetime
from Crypto.PublicKey import RSA
from Crypto.Signature import PKCS1_v1_5
from Crypto.Hash import SHA256
from urllib.parse import quote_plus
from urllib.parse import urlparse, parse_qs
from base64 import decodebytes, encodebytes
import json
 
class AliPay(object):
 """
 支付宝支付接口(PC端支付接口)
 """
 
 def __init__(self, appid, app_notify_url, app_private_key_path,
  alipay_public_key_path, return_url, debug=False):
 self.appid = appid
 self.app_notify_url = app_notify_url
 self.app_private_key_path = app_private_key_path
 self.app_private_key = None
 self.return_url = return_url
 with open(self.app_private_key_path) as fp:
 self.app_private_key = RSA.importKey(fp.read())
 self.alipay_public_key_path = alipay_public_key_path
 with open(self.alipay_public_key_path) as fp:
 self.alipay_public_key = RSA.importKey(fp.read())
 
 if debug is True:
 self.__gateway = "https://openapi.alipaydev.com/gateway.do"
 else:
 self.__gateway = "https://openapi.alipay.com/gateway.do"
 
 def direct_pay(self, subject, out_trade_no, total_amount, return_url=None, **kwargs):
 biz_content = {
 "subject": subject,
 "out_trade_no": out_trade_no,
 "total_amount": total_amount,
 "product_code": "FAST_INSTANT_TRADE_PAY",
 # "qr_pay_mode":4
 }
 
 biz_content.update(kwargs)
 data = self.build_body("alipay.trade.page.pay", biz_content, self.return_url)
 return self.sign_data(data)
 
 def build_body(self, method, biz_content, return_url=None):
 data = {
 "app_id": self.appid,
 "method": method,
 "charset": "utf-8",
 "sign_type": "RSA2",
 "timestamp": datetime.now().strftime("%Y-%m-%d %H:%M:%S"),
 "version": "1.0",
 "biz_content": biz_content
 }
 
 if return_url is not None:
 data["notify_url"] = self.app_notify_url
 data["return_url"] = self.return_url
 
 return data
 
 def sign_data(self, data):
 data.pop("sign", None)
 # 排序后的字符串
 unsigned_items = self.ordered_data(data)
 unsigned_string = "&".join("{0}={1}".format(k, v) for k, v in unsigned_items)
 sign = self.sign(unsigned_string.encode("utf-8"))
 # ordered_items = self.ordered_data(data)
 quoted_string = "&".join("{0}={1}".format(k, quote_plus(v)) for k, v in unsigned_items)
 
 # 获得最终的订单信息字符串
 signed_string = quoted_string + "&sign=" + quote_plus(sign)
 return signed_string
 
 def ordered_data(self, data):
 complex_keys = []
 for key, value in data.items():
 if isinstance(value, dict):
 complex_keys.append(key)
 
 # 将字典类型的数据dump出来
 for key in complex_keys:
 data[key] = json.dumps(data[key], separators=(',', ':'))
 
 return sorted([(k, v) for k, v in data.items()])
 
 def sign(self, unsigned_string):
 # 开始计算签名
 key = self.app_private_key
 signer = PKCS1_v1_5.new(key)
 signature = signer.sign(SHA256.new(unsigned_string))
 # base64 编码，转换为unicode表示并移除回车
 sign = encodebytes(signature).decode("utf8").replace("\n", "")
 return sign
 
 def _verify(self, raw_content, signature):
 # 开始计算签名
 key = self.alipay_public_key
 signer = PKCS1_v1_5.new(key)
 digest = SHA256.new()
 digest.update(raw_content.encode("utf8"))
 if signer.verify(digest, decodebytes(signature.encode("utf8"))):
 return True
 return False
 
 def verify(self, data, signature):
 if "sign_type" in data:
 sign_type = data.pop("sign_type")
 # 排序后的字符串
 unsigned_items = self.ordered_data(data)
 message = "&".join(u"{}={}".format(k, v) for k, v in unsigned_items)
 return self._verify(message, signature)

urlpatterns = [
 url(r'^admin/', admin.site.urls),
 url(r'^page1/', views.page1),
 url(r'^index/', views.index),
 url(r'^page2/', views.page2),
 ]

from django.shortcuts import render, redirect, HttpResponse
 from utils.pay import AliPay
 import json
 import time
 
 
 def get_ali_object():
 # 沙箱环境地址：https://openhome.alipay.com/platform/appDaily.htm"2016091100486897" # APPID （沙箱应用）
 
 # 支付完成后，支付偷偷向这里地址发送一个post请求，识别公网IP,如果是 192.168.20.13局域网IP ,支付宝找不到，def page2() 
 # 接收不到这个请求
 notify_url = "http://47.94.172.250:8804/page2/"
 
 # 支付完成后，跳转的地址。
 return_url = "http://47.94.172.250:8804/page2/"
 
 merchant_private_key_path = "keys/app_private_2048.txt" # 应用私钥
 alipay_public_key_path = "keys/alipay_public_2048.txt" # 支付宝公钥
 
 alipay = AliPay(
 appid=app_id,
 app_notify_url=notify_url,
 return_url=return_url,
 app_private_key_path=merchant_private_key_path,
 alipay_public_key_path=alipay_public_key_path, # 支付宝的公钥，验证支付宝回传消息使用，不是你自己的公钥
 debug=True, # 默认False,
 )
 return alipay
 
 def index(request):
 return render(request,'index.html')
 
 def page1(request):
 # 根据当前用户的配置，生成URL，并跳转。 
 money = float(request.POST.get('money'))
 
 alipay = get_ali_object()
 
 # 生成支付的url
 query_params = alipay.direct_pay(
 subject="充气式赵俊明", # 商品简单描述
 out_trade_no="x2" + str(time.time()), # 用户购买的商品订单号（每次不一样） 20180301073422891
 total_amount=money, # 交易金额(单位: 元 保留俩位小数)
 )
 
 pay_url = "https://openapi.alipaydev.com/gateway.do".format(query_params) # 支付宝网关地址（沙箱应用）
 
 return redirect(pay_url)
 
 
 def page2(request):
 alipay = get_ali_object()
 if request.method == "POST":
 # 检测是否支付成功
 # 去请求体中获取所有返回的数据：状态/订单号
 from urllib.parse import parse_qs
 # name&age=123....
 body_str = request.body.decode('utf-8')
 post_data = parse_qs(body_str)
 
 post_dict = {}
 for k, v in post_data.items():
 post_dict[k] = v[0]
 
 # post_dict有10key： 9 ，1
 sign = post_dict.pop('sign', None)
 status = alipay.verify(post_dict, sign)
 print('------------------开始------------------')
 print('POST验证', status)
 print(post_dict)
 out_trade_no = post_dict['out_trade_no']
 
 # 修改订单状态
 # models.Order.objects.filter(trade_no=out_trade_no).update(status=2)
 print('------------------结束------------------')
 # 修改订单状态：获取订单号
 return HttpResponse('POST返回')
 
 else:
 params = request.GET.dict()
 sign = params.pop('sign', None)
 status = alipay.verify(params, sign)
 print('==================开始==================')
 print('GET验证', status)
 print('==================结束==================')
 return HttpResponse('支付成功')

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>Title</title>
 <link rel="stylesheet" href="dist/css/bootstrap.css" rel="external nofollow" >
</head>
<body>
 <form action="/page1/" method="POST">
 {% csrf_token %}
 <input type="text" name="money">
 <input type="submit" value="去支付" />
 </form>
<script></script>
</body>
</html>