Python快速开发支付宝支付方法

1、前期准备（安装依赖模块）

pip3 install pycryptodome

2、去蚂蚁金服开放平台申请

蚂蚁金服开放平台网址

https://open.alipay.com/platform/home.htm

注册流程（注意正式支付开发与其一样只不过获取就不是沙箱的各项信息了）

登录蚂蚁金服开放平台（与支付宝同意账号）---》注册成为开发者---》填写各种信息---》成功后点击顶部开发者中心----》启动沙箱环境---》沙箱应用-----》生成RSA2(SHA256)密钥(推荐）【查看生成方法文档】-----填写完毕

3由于蚂蚁金服未提供Python开发的SDK（需要去github上下载其方法）

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())
        # 注意如果debug如果不是True将不是沙箱环境【标识非正式环境url中含有dev字样】
        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)

4、其他部分源码

<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>
    <form method="post">
        {% csrf_token %}
        <input type="text" name="price" placeholder="请输入要支付的金额">
        <input type="submit" value="支付">
    </form>
</body>
</html>

from django.shortcuts import render,redirect,HttpResponse
from django.views.decorators.csrf import csrf_exempt
from utils.pay import AliPay
import time
from django.conf import settings

def aliPay():
    obj = AliPay(
        appid=settings.APPID,
        app_notify_url=settings.NOTIFY_URL,  # 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）
        return_url=settings.RETURN_URL,  # 如果支付成功，重定向回到你的网站的地址。
        alipay_public_key_path=settings.PUB_KEY_PATH,  # 支付宝公钥
        app_private_key_path=settings.PRI_KEY_PATH,  # 应用私钥
        debug=True,  # 默认False,
    )
    return obj

def index(request):
    if request.method == 'GET':
        return render(request,'index.html')



    alipay = aliPay()

    # 对购买的数据进行加密
    money = float(request.POST.get('price'))
    out_trade_no = "x2" + str(time.time())
    # 1. 在数据库创建一条数据：状态（待支付）

    query_params = alipay.direct_pay(
        subject="【全地形代步工具而二点零】",  # 商品简单描述
        out_trade_no= out_trade_no,  # 商户订单号
        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)

    return redirect(pay_url)


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')



@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':
        from urllib.parse import parse_qs

        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:
            # 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('')

from django.conf.urls import url
from django.contrib import admin
from pay import views
urlpatterns = [
    url(r'^admin/', admin.site.urls),
    url(r'^index/', views.index),
    url(r'^pay_result/', views.pay_result),
    url(r'^update_order/', views.update_order),
]

# 支付相关配置
APPID = "申请下来的APPID "
# 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）
NOTIFY_URL = "http://xxx.xxx.xx.xx:xx/update_order/"
# 如果支付成功，重定向回到你的网站的地址。
RETURN_URL = "http://xxx.xxx.xx.xx:xxxx/pay_result/"
PRI_KEY_PATH = "keys/app_private_2048.txt"  # # 支付宝公钥
PUB_KEY_PATH = "keys/alipay_public_2048.txt"  # 应用私钥

文件名：alipay_public_2048.txt

注意秘钥需要以
-----BEGIN PUBLIC KEY-----
支付宝公钥
-----END PUBLIC KEY-----



文件名：app_private_2048.txt

-----BEGIN RSA PRIVATE KEY-----
应用私钥
-----END RSA PRIVATE KEY-----

5、目录结构：

6、运行中可能报的错【Not a valid PEM post boundary】

 　　导致期中的一种原因为在生成应用公钥与应用私钥后使用的记事本打开的，未将记事本的自动换行关闭，导致存在不可见得换行符，故在使用记事本打开后请关闭掉自动换行。