支付宝支付示例

加密：RAS 

秘钥：商户私钥+支付宝公钥

宕机：重发

精度：小数点后两位

settings.py

# 支付相关配置
APPID = "2016082500309412"
NOTIFY_URL = "http://47.98.134.86:80/update_order/"
RETURN_URL = "http://47.98.134.86:80/pay_result/"
PRI_KEY_PATH = "keys/app_private_2048.txt"
PUB_KEY_PATH = "keys/alipay_public_2048.txt"

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAwAKqBWxQfVsWwphI6avNRd3cCRNsQrgfIW1WuOM2A0ZU2mH9oJwbZkE7rN1mveJsI6R96vO27wZ6ewHljDgT/HKTw3Y7lYyKdezJYm7rFqBey0n8s5qnjuPYaO2l+E9v9VxfyEGyviTOY9mgzPmjplmfr3GGyVMVaWoIwVLB4atNobxt6TelgCGlF8wcbQmmVIrvWVTyCLqNjl8mBOtyeWCQ7mLsFeGzV7R+ifjpXceMOzUkEjU6XNor+AgUGYuHhOdb04tLAl4Hq/nicQveTBWnrqBO5NbUGZP5l5LKNA0nDptvBrmC14rLIbCaflA4OVzq7Q2QWI+czaA1VOMwcwIDAQAB
-----END PUBLIC KEY-----

-----BEGIN RSA PRIVATE KEY-----
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
-----END RSA PRIVATE KEY-----

from datetime import datetime
from Crypto.PublicKey import RSA               #RSA加密
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("
", "")
        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)

pay.py中有一些算法，依赖于Crypto

使用cmd进行安装

pip3 install pycryptodome

app01/views.py

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   商户
        debug=True,  # 默认False,
    )
    return obj

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

    # 实例化，用于对数据进行加密，并生成url
    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())     #订单号
    # 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mm",  # 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)  #校验

    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')  #拿订单号
            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('')  #GET请求不处理

templates/index.html

<!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.db import models

class Order(models.Model):

    title = models.CharField(max_length=32)
    order_num = models.CharField(max_length=32)
    status_choices = (
        (1,'未支付'),
        (2,'已支付'),
    )
    status = models.IntegerField(choices=status_choices,default=1)