python支付寶頁面掃碼支付

一、介紹

基於網上一個支付寶pay.py封裝了支付寶API的文件進行的，以下代碼只支持網頁掃碼支付，手機端會提示調用支付寶支付

#pay文件代碼
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 base64 import decodebytes, encodebytes
import json

class AliPay(object):
    """
    支付寶支付接口(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.AlipayAPI.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)

        # 獲得最終的訂單信息字符串
        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)

        # 將字典類型的數據dump出來
        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):
        # 開始計算簽名
        key = self.app_private_key
        signer = PKCS1_v1_5.new(key)
        signature = signer.sign(SHA256.new(unsigned_string))
        # base64 編碼，轉換為unicode表示並移除回車
        sign = encodebytes(signature).decode("utf8").replace("\n", "")
        return sign

    def _verify(self, raw_content, signature):
        # 開始計算簽名
        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)

二、自己封裝的調用代碼

import time
from pay import AliPay

class AlipayApi(object):
    def __init__(self, app_id, notify_url, return_url, merchant_private_key_path, alipay_public_key_path,debug):
        """
        :param app_id:
        :param notify_url:支付寶post回調地址，用來修改訂單信息
        :param return_url:支付寶get回調地址，用來給用戶展示
        :param merchant_private_key_path:商戶的私鑰
        :param alipay_public_key_path:支付寶的公鑰
        """
        self.app_id = app_id
        self.notify_url = notify_url
        self.return_url = return_url
        self.merchant_private_key_path = merchant_private_key_path
        self.alipay_public_key_path = alipay_public_key_path
        self.debug=debug
        self.alipay = AliPay(
            appid=app_id,
            app_notify_url=notify_url,
            return_url=return_url,
            app_private_key_path=merchant_private_key_path,
            alipay_public_key_path=alipay_public_key_path,  # 支付寶的公鑰，驗證支付寶回傳消息使用，不是你自己的公鑰
            debug=debug,  # 默認False,
        )

    def getAlipayPage(self,subject,total_amount,out_trade_no,):
        """
        :param subject: 商品簡單描述
        :param total_amount: 交易總金額(單位: 元 保留倆位小數)
        :param out_trade_no: 商戶訂單號
        :return: 支付寶支付頁面
        """
        query_params = self.alipay.direct_pay(
            subject=subject,
            out_trade_no=out_trade_no,
            total_amount=total_amount,
        )
        if self.debug:
            pay_url = "https://openapi.alipaydev.com/gateway.do?{}".format(query_params)
        else:
            pay_url = "https://openapi.alipay.com/gateway.do?{}".format(query_params)
        return pay_url

    def alipayCallbackPost(self,body_str):
        """
        :param body_str: post回調的數據
        :return:
        """
        from urllib.parse import parse_qs
        post_data = parse_qs(body_str)
        post_dict = {}
        for k, v in post_data.items():
            post_dict[k] = v[0]
        # 做二次驗證
        sign = post_dict.pop('sign', None)
        # 通過調用alipay的verify方法去認證
        status = self.alipay.verify(post_dict, sign)
        if status:
            # 修改自己訂單狀態
            return True
        else:
            return False

    def alipayCallbackGet(self,params):
        """
        :param params: get回調的數據
        :return:
        """
        dic_params = {k: v for k, v in params.items()}
        sign = dic_params.pop('sign', None)
        status = self.alipay.verify(dic_params, sign)
        if status:
            return True
        else:
            return False


if __name__ == '__main__':
    app_id = "填寫自己的"
    notify_url = "填寫自己的"
    return_url = "填寫自己的"
    merchant_private_key_path = "app_private_2048.txt"
    alipay_public_key_path = "alipay_public_2048.txt"
    ali=AlipayApi(app_id=app_id,
                  notify_url=notify_url,
                  return_url=return_url,
                  merchant_private_key_path=merchant_private_key_path,
                  alipay_public_key_path=alipay_public_key_path,
                  debug=True)

    subject="充氣娃娃"
    out_trade_no="OFG"+str(time.time())
    total_amount=1000
    url=ali.getAlipayPage(subject=subject,out_trade_no=out_trade_no,total_amount=total_amount)
    print(url)

key文件的格式

效果圖