django支付宝支付集成

概要

本文是关于django集成支付宝【电脑网站支付】功能的过程记录。

功能逻辑主要分为两块：

1. 用户下单跳转至支付宝支付界面
2. 支付成功的回调验证

本文用到的alipay-sdk是基于阿里开发文档http接口请求规则的初步封装，也并非是本人原创。但真实上线门槛略高，需要企业营业执照，对个体程序员不是很友好，而且还要收取0.6%的手续费，不得不吐糟一下。

---

python 支付接口

# pip install pycryptodome

from datetime import datetime
from Crypto.PublicKey import RSA
from Crypto.Signature import PKCS1_v1_5
from Crypto.Hash import SHA256
from base64 import b64encode, b64decode
from urllib.parse import quote_plus
from urllib.parse import urlparse, parse_qs
from urllib.request import urlopen
from base64 import decodebytes, encodebytes

import json

class AliPay(object):

    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.import_key(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)

跳转支付界面

class OrderView(View):
    def get(self,request,*args,**kwargs):
        total_amount = request.GET.get('total_amount')
        subject = request.GET.get('subject')
        out_trade_no = request.GET.get('out_trade_no')
        # 业务逻辑【保存订单】
        # 跳转支付页面
        alipay = AliPay(
            appid="2016101100660254",
            app_notify_url="http://127.0.0.1:8000/checkout/verify/",
            app_private_key_path=private_key_path,
            alipay_public_key_path=ali_pub_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_url="http://127.0.0.1:8000/checkout/verify/"
        )

        query_params = alipay.direct_pay(
            subject=subject,  # 商品简单描述
            out_trade_no=out_trade_no,  # 商户订单号
            total_amount=total_amount, # 金额
        )
        pay_url = "https://openapi.alipaydev.com/gateway.do?{}".format(query_params)
        return redirect(pay_url)

回调验证

class AlipayView(View):
    def get(self, request):
        """
        处理支付宝的return_url返回
        :param request:
        :return:
        """
        processed_dict = {}
        for key, value in request.GET.items():
            processed_dict[key] = value

        sign = processed_dict.pop("sign", None)

        alipay = AliPay(
            appid="2016101100660254",
            app_notify_url="http://127.0.0.1:8000/checkout/verify/",
            app_private_key_path=private_key_path,
            alipay_public_key_path=ali_pub_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_url="http://127.0.0.1:8000/checkout/verify/"
        )

        condition = alipay.verify(processed_dict, sign)

        if condition:
            # 更改订单状态
            return HttpResponse('支付成功')

    def post(self, request):
        """
        处理支付宝的notify_url
        :param request:
        :return:
        """
        processed_dict = {}
        for key, value in request.POST.items():
            processed_dict[key] = value

        sign = processed_dict.pop("sign", None)

        alipay = AliPay(
            appid="",
            app_notify_url="http://127.0.0.1:8000/checkout/verify/",
            app_private_key_path=private_key_path,
            alipay_public_key_path=ali_pub_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_url="http://127.0.0.1:8000/checkout/verify/"
        )

        condition = alipay.verify(processed_dict, sign)

        if condition:
            # 更改订单状态
            return HttpResponse("支付成功")

关于return_url 和notify_url