使用Python接入支付宝当面付

使用Python接入支付宝当面付

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准备

由于正式环境需要商户信息,所以这里使用支付宝提供的沙箱环境。切换到正式环境后只需稍改配置。
1、点击进入蚂蚁金服平台官网
2、如下图选择:开发者中心->开发服务下的研发服务->沙箱。
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生成RSA秘钥

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下载秘钥生成工具:
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解压后目录如下:
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双击验签工具,打开后直接点击生成秘钥:
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此时验签工具目录下会生成 RSA秘钥 文件夹:
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目录如下:
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设置应用公钥

直接将上一步生成的 公钥2048 内容贴入保存:
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设置完之后会生成 查看支付宝公钥 按钮:
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支付宝公钥会在设置应用公钥后自动生成,无需手动设置:
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使用

安装依赖

$ pip install pycryptodome

引入帮助类 AliPay

// /utils/pay.py
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())

        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)

配置秘钥

/keys/app_private_2048.txt

-----BEGIN RSA PRIVATE KEY-----
MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQCln7XrQxciEcJiLSgBQYiLLmDo8ES6osoZg6/o67JnsRutyxPVDvdmlSRh4+BKisdUuj54uHUYKH99oXnv7P+OMQu6oNbyo82UdJSOT2wSh+jjSPUqpZrHZEmABs380xD3okD6L312IZDMP4GcjA1b06kug2m6uFi4Dh2VVvts/32j4E9d49m3O70BL0OgrJf/ogT7qZT+tsKZd+B2l1zBTV9MJAjW4J3Rj4HC0a2o1c8iKnlbEEg6hOrrZXByKitOsMkZ69Z0bjgXP6k2o+pKdmA5zs9Iscu3D3BsPXAi/5Rbguh61UzJW5S2BLShx9WNRmdA62ZD+nGWgz0zG7BxAgMBAAECggEAaSIdd26KA61kR6/EYi+4Pik9iP/jkNl/En0eL+tVvy6UlFiBiVBLyUlI4/6jxI2dhHII79afNauXaicTYTJ+8kK94ETyzOkfuWnbVw6hWo39TjFktyKSQpmtcmBfZ2qPrbHIL0fwCwm5gX2ah8X7QNv127m9ZrJYVtVXABJL3V60oh3dMfZiITLmGA+dp2ppMahHfLf0pWhc75u1wznqheIFYWEEuF6KhHQuHVPi7yrCfWK0eHeuFbLm1i9RB48XKJYt0DyfcByF2JZiOmm/RRMtKF7LFP9zRaBw1JVYkbmbnA38L0Tq8Wo+xyiDiQLBOF/P/z2j799I43QSg3VxpQKBgQDug9vBmwHU5/ATnXM6zueEr9YDow5XChYNgS+isVYWOAmfaGbLhRozqyTTiwugISYIa5YJE+h0fJZWQYj/w19uQH7my61uc88ap/zQpSk9/iEHG4/fYm4poiToeTs7iOSJyFRCLr4WA3vIW0wD6ZTV9oEUGZHJCrkMO4CQXhvpVwKBgQCxw+y0zSfvwR4ElNx8EmOwfTIrBm7wdba93sWbub/iHX9rnLxCrt3ZP7wiL/VcYhh3DXzA/rUIWozAiF8pb5+deHLdVkiyfpzTeP6uvirhRsYbZ861lpuBm7CnF8ztAmjjwm05nxEHNxIBTfHPkilSx64hFj64raUnrbj49MbvdwKBgEnW9nSUiVehSli4ONEu9svEJ+xOUYUusS8THG0wm2cbiBcamiBNn5P5WthGxp2XRY/7xqIe0KsnWt9vQHt1v5iBTQgkbBeysJ4e/YyWZRM1FoJ9zOeqMFKhSO3TgjvnIGFrbHJkyCJGh866POlFKfenbcSMOe7Ua/9WeHG5QMjXAoGBAKWx6Q4x+Fq7GB7PHqErhu54E+4Uxg2uu1JJtsnLnvbF5gJJixVg53rbtKHtL/gXm5RE5xcBk36g4HeJ5aG64P2nyvFSvtpZuBZJvqLksRVgocHjxcJvCq4Jj+SAA8ybpWc+0A6YnQerpkW/AHkpVQlLBJzknjwH51yPyk2L425LAoGBAIYel91QaxEXcVZ7dqZ0+wGixocB2p0Tj2RYqOH3tEdNjqHBAZWTGPlSaPzhlNdNdqYUZAvNe+NbpTVUzr/EVBEb6iLK6lylJDgPVXh20wPKFaZhG4cEjdeMlYXrvzif0lDnGPz4ynRqyqsVBzq8rJazH+2G01p8awuHLzJpJnlv
-----END RSA PRIVATE KEY-----

/keys/alipay_public_2048.txt

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAwrww6DyKMamYkFEH+KWoMmXW9UOmFB63XZuYlENz3ijgIeA1eGV4t7NhTb7gtwcRWXG1octr2xaAtOLaaS9cBuRm6Esd5JYVp7+k6bt4oWO88ghLs2rNyQstW7OXqtrflCAUrqXYdEWpcXOZZALDIgLW/xFfXTYI2PvKZlUaKYCNVMoM1Ed0TqakJ7B1ZhLfQWy++Z8ZJ0MrFEpEv2XQ8NO2GuAD7KHVj6HaQ+1Mbvq9D4VhVrWNvgKSftom1VjsaxSkdWZr6AqVq/GOyZw/Dov24ggyMHIZ7aQKlVN52MYIiD57E55D1UJ66edMdofTivdlsqFUZ8Q9ylRTAMJJhwIDAQAB
-----END PUBLIC KEY-----

注意:这两个文件中的头和尾标识符不可缺少,中间是生成的 key。

// settings.py
APPID = "2016092300580728"

NOTIFY_URL = "http://.../update_order/" 
# 上面这个地址应该是在公网能够访问到的地址,否则接收不到支付宝的回调。

RETURN_URL = "http://.../pay_result/"
PRI_KEY_PATH = "keys/app_private_2048.txt"
PUB_KEY_PATH = "keys/alipay_public_2048.txt"

AliPay 的实例化参数

def aliPay():
    obj = AliPay(
        appid=settings.APPID, # 沙箱环境->沙箱应用 提供的APPID 我这里是 2016092300580728
        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

加密并生成 URL

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="充气式娃娃",  # 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)

重定向到生成的 URL 后,支付宝方会根据 URL 携带的参数解密展示信息如下:
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回调

支付成功后支付宝会向我们指定的地址发送 POST 请求,我们可以在此回调中进行逻辑处理:

@csrf_exempt
def update_order(request):
    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:
            # 1. 获取订单号
            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('success')
        else:
            return HttpResponse('fail')
    return HttpResponse('')

校验是否成功

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()
    # 校验支付是否成功
    status = alipay.verify(params, sign)

    if status:
        return HttpResponse('支付成功')
    return HttpResponse('支付失败')

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完整示例下载

https://github.com/zze326/alipay_test

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Links: https://www.zze.xyz/archives/python-alipay.html

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