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支付宝付款(python)


其实蚂蚁金服提供了开放平台的官方SDK,但是github仅有十几个star, 用的可以试一下

这是根据文档中请求字段和签名流程写的支付宝的SDK, 只有一个类, 用起来也算方便.

支付宝付款的整个过程参考付款结算的所有参数, 其中对请求字段的处理最困难与sign字段的签名以及回调url的验证上, 详见sign字段的签名过程.

付款源码(复制即用):

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):
    """
    支付宝支付接口
    """
    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:
            import ipdb
            ipdb.set_trace()
            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)

付款的过程:

alipay = AliPay(
        appid="",
        app_notify_url="",
        # 类中使用的打开硬盘内文件的方式读取私钥和支付宝公钥, 如果使用者是将钥匙放到了环境变量中可以视情况修改类中的源码
        app_private_key_path="私钥路径",
        alipay_public_key_path="公钥路径",  # 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,如果是true使用表示开发环境, 将调用正式的HTTPS请求地址, 如果是false将调用沙盒环境的HTTPS请求地址
    # 这里是回调url, 如果付款结束后会将返回的参数拼接到这个url后面并做跳转
    return_url="http://127.0.0.1:8000/alipay/return/"
    )

    # 调用付款函数, 具体字段请查看文档
    url = alipay.direct_pay(
    subject="测试订单2",
    out_trade_no="201702021111",
    total_amount=100,
    return_url="http://127.0.0.1:8000/alipay/return/"
)
    re_url = "https://openapi.alipaydev.com/gateway.do?{data}".format(data=url)
    # 打开付款界面
    webbrowser.open(re_url)
    print(re_url)

对于回调url的验证

# 这里是付款成功后浏览器跳转的url
return_url = 'http://127.0.0.1:8000/alipay/return/?charset=utf-8&out_trade_no=201702021111&method=alipay.trade.page.pay.return&total_amount=100.00&sign=rZfjYJiwBNMUjqV2WQnj667LgiWCGOmAPzg2Rfdb3GW57yYN0DqpAujN9gP8ozZISGFvtt%2FMtsuBS2ksAf%2BqFe9uc7SPp84cg3I1aBb2EI1DqH%2FZCHuazjFAU1g5diQUmH37vlzP%2FS2cUCDHkldVG9%2FmXubvPg17qLPzCOql4jbC3Co2rYppIt6gq30bnNHXPJfhrjhTG0F5GnOfmkUcEvuTP2agzquY66Sx6KGlkNxTzO3z%2F4laFJygbuvmhchLDEmZm1TAi3CUuAh656LLkTYHJxVMtd5CuBYMuhX7dGE1pk6YuM4oFde1MhpFGWbql%2FC7ue3ZSVvMt8aZXL9e%2BA%3D%3D&trade_no=2018072121001004490200511991&auth_app_id=2016091900546396&version=1.0&app_id=2016091900546396&sign_type=RSA2&seller_id=2088102176308352&timestamp=2018-07-21+23%3A16%3A25'

    alipay = AliPay(
    appid="",
    app_notify_url="http://127.0.0.1:8000/alipay/return/",
    app_private_key_path="/home/wukt/project/part4djagno/t1nkuy/apps/keys/app_private_key.pem",
    alipay_public_key_path="/home/wukt/project/part4djagno/t1nkuy/apps/keys/alipay_public",  # 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/alipay/return/"
)

    # 解析返回的url中的参数
    o = urlparse(return_url)
    query = parse_qs(o.query)
    processed_query = {}
    ali_sign = query.pop("sign")[0]
    for key, value in query.items():
        processed_query[key] = value[0]
    # true表示验证成功, false表示验证失败
    print (alipay.verify(processed_query, ali_sign))

验证notifyurl的过程类似

比如这是在视图中验证付款状态后更改订单状态的过程

class AlipayView(APIView):
    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="",
            app_notify_url="http://127.0.0.1:8000/alipay/return/",
            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/alipay/return/"
        )

        verify_re = alipay.verify(processed_dict, sign)

        if verify_re is True:
            order_sn = processed_dict.get('out_trade_no', None)
            trade_no = processed_dict.get('trade_no', None)
            trade_status = processed_dict.get('trade_status', None)

            existed_orders = OrderInfo.objects.filter(order_sn=order_sn)
            for existed_order in existed_orders:
                existed_order.pay_status = trade_status
                existed_order.trade_no = trade_no
                existed_order.pay_time = datetime.now()
                existed_order.save()

            response = redirect("index")
            response.set_cookie("nextPath","pay", max_age=3)
            return response
        else:
            response = redirect("index")
            return response

    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/alipay/return/",
            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/alipay/return/"
        )

        verify_re = alipay.verify(processed_dict, sign)

        if verify_re is True:
            order_sn = processed_dict.get('out_trade_no', None)
            trade_no = processed_dict.get('trade_no', None)
            trade_status = processed_dict.get('trade_status', None)

            existed_orders = OrderInfo.objects.filter(order_sn=order_sn)
            for existed_order in existed_orders:
                order_goods = existed_order.goods.all()
                for order_good in order_goods:
                    goods = order_good.goods
                    goods.sold_num += order_good.goods_num
                    goods.save()

                existed_order.pay_status = trade_status
                existed_order.trade_no = trade_no
                existed_order.pay_time = datetime.now()
                existed_order.save()

            return Response("success")

看起来逻辑挺清晰的, 就是代码太冗余了。


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