python调用支付宝支付接口流程

ALIPAY_PUBLIC = os.path.join(BASE_DIR,'alipay_use','alipay','alipay_keys','alipay_public.txt')
APP_PUBLIC = os.path.join(BASE_DIR,'alipay_use','alipay','alipay_keys','app_public.txt')
APP_PRIVATE = os.path.join(BASE_DIR,'alipay_use','alipay','alipay_keys','app_private.txt')

# _*_ coding=utf-8 _*_
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 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)

from django.contrib import admin
from django.conf.urls import url
from app01 import views
urlpatterns = [
  url('admin/', admin.site.urls),
  url('index/', views.index),
  url('result/', views.pay_result), # 支付宝处理完成后回调的get请求路由
  url('update_order/', views.update_order), # 支付宝处理完成后回调的post请求路由
]

import time
from urllib.parse import parse_qs
from django.conf import settings
from django.shortcuts import render, redirect, HttpResponse
from django.views.decorators.csrf import csrf_exempt
from alipay_use.alipay.alipay import AliPay
def aliPay():
  obj = AliPay(
    appid="2016100100642208",               # 支付宝沙箱里面的APPID，需要改成你自己的
    app_notify_url="http://129.211.29.98/update_order/", # 如果支付成功，支付宝会向这个地址发送POST请求（校验是否支付已经完成），此地址要能够在公网进行访问，需要改成你自己的服务器地址
    return_url="http://129.211.29.98/result/",      # 如果支付成功，重定向回到你的网站的地址。需要你自己改，这里是我的服务器地址
    alipay_public_key_path=settings.ALIPAY_PUBLIC, # 支付宝公钥
    app_private_key_path=settings.APP_PRIVATE,   # 应用私钥
    debug=True, # 默认False,True表示使用沙箱环境测试
  )
  # 优化:在settings里面的设置后使用
  # obj = AliPay(
  #   appid=settings.APPID,
  #   app_notify_url=settings.NOTIFY_URL,
  #   return_url=settings.RETURN_URL,
  #   alipay_public_key_path=settings.PUB_KEY_PATH,
  #   app_private_key_path=settings.PRI_KEY_PATH,
  #   debug=True,
  # )
  return obj
@csrf_exempt
def index(request):
  if request.method == "GET":
    return render(request, 'index.html')
  # 实例化SDK里面的类AliPay
  alipay = aliPay()
  # 对购买的数据进行加密
  money = float(request.POST.get('price')) # 保留俩位小数 前端传回的数据
  out_trade_no = "x2" + str(time.time()) # 商户订单号  # 订单号可以有多中生成方式，可以百度一下
  # 1. 在数据库创建一条数据：状态（待支付）
  query_params = alipay.direct_pay(
    subject="充气式Saber", # 商品简单描述 这里一般是从前端传过来的数据
    out_trade_no=out_trade_no, # 商户订单号 这里一般是从前端传过来的数据
    total_amount=money, # 交易金额(单位: 元 保留俩位小数)  这里一般是从前端传过来的数据
  )
  # 拼接url，转到支付宝支付页面
  pay_url = "https://openapi.alipaydev.com/gateway.do?{}".format(query_params)
  return redirect(pay_url)
@csrf_exempt
def update_order(request):
  """
  支付成功后，支付宝向该地址发送的POST请求（用于修改订单状态）
  :param request:
  :return:
  """
  if request.method == 'POST':
    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]
    alipay = aliPay()
    sign = post_dict.pop('sign', None)
    status = alipay.verify(post_dict, sign)
    if status:
      # 1.修改订单状态
      out_trade_no = post_dict.get('out_trade_no')
      print(out_trade_no)
　　　　　　
      # 2. 根据订单号将数据库中的数据进行更新
      return HttpResponse('支付成功')
    else:
      return HttpResponse('支付失败')
  return HttpResponse('')
@csrf_exempt
def pay_result(request):
  """
  支付完成后，跳转回的地址
  :param request:
  :return:
  """
  params = request.GET.dict()
  sign = params.pop('sign', None)
  alipay = aliPay()
  status = alipay.verify(params, sign)
  if status:
    return HttpResponse('支付成功')
  return HttpResponse('支付失败')

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<body>
<form action="" method="post">
  <input type="text" name="price">
  <input type="submit">
</form>
</body>
</html>