python对接支付宝当面付

2023年全新python对接支付宝当面付sdk

由于支付宝官方只公开了对接网站支付和移动端支付教程，并未推出利用当面付的公钥对接支付教程。

很多python网友一直未找到python对接当面付的sdk，此源码是根据阅读官方文档和官方的sdk改的

python可以直接调用对接当面付密钥即可调用，节省了网友阅读官方文档和研究的时间

支付对接源文件：

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, os

PRI_KEY_PATH = os.path.dirname(os.path.abspath(__file__)) + r"\keys\app_private_2048.txt"
PUB_KEY_PATH = os.path.dirname(os.path.abspath(__file__)) + r"\keys\alipay_public_2048.txt"


class AliPay(object):
    """
    支付宝支付接口
    {
    alipay.trade.precreate   支付宝当面付的url
    }
    """

    def __init__(self, appid, app_notify_url=None, app_private_key_path=PRI_KEY_PATH,
                 alipay_public_key_path=PUB_KEY_PATH, return_url=None, 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": "FACE_TO_FACE_PAYMENT",
            # "qr_pay_mode":4
        }

        biz_content.update(kwargs)
        data = self.build_body("alipay.trade.precreate", biz_content, self.return_url)
        return self.__gateway + "?" + 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)

使用教程：

import AliPay
alipay = AliPay(
appid="支付宝后台appid",
app_notify_url="http://localhost/ceshi1", # 支付成功访问的地址
return_url="http://localhost/ceshi", # 支付成功跳转地址
)
query_url=alipay.direct_pay(subject="支付测试", out_trade_no=str(int(time.time() * 1000)), total_amount=0.01)
fw = requests.get(query_url)
print(fw.text)

通过以上方法即可拿到支付的url，支付宝打开返回的url即可看淡支付界面，和对接支付宝网站支付移动支付是一样的。

注意：把支付对接源文件和python运行文件放在一个目录