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)

7. views中使用

class PayViewset()
    alipay = AliPay(
        appid="2016346813xxx",  # appid
        app_notify_url="http://54.28.33.60/page1",  # post请求，用于最后检测是否支付成功（异步）
        app_private_key_path="../KEYS/app-private-2048.txt",
        alipay_public_key_path="../KEYS/alipay-public-2048.txt",  # 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
        return_url="http://54.28.33.60/page2",  # get请求，用于支付宝支付完成后立即跳转的页面（同步）
        debug=True,  # 默认False,
    )
    url = alipay.direct_pay(
        subject="测试订单",  # 订单名称
        out_trade_no="201702021222",  # 订单号
        total_amount=100  # 支付金额
    )
    re_url = "https://openapi.alipaydev.com/gateway.do?{data}".format(data=url)  # 此链接就是支付页面的链接
    return redirect(re_url)


class Alipay(APIView):
    def get(self):
        '''
        处理return_url接收到的请求
        :return:
        '''
        # 处理与notify_url请求相似,根据业务需求
        pass

    def post(self,request):
        '''
        处理notify_url接收到的请求
        :return:
        '''
        processed_dict = {}  # 定义一个字典，用来存放支付宝发来的信息，后面用起来方便
        for key,value in request.POST.items():
            processed_dict[key] = value
        sign = processed_dict.pop('sign',None)  # 将签名取出并删除掉
        
        # 再次实例化一下
        alipay = AliPay(
            appid="2016346813545",  #
            app_notify_url="http://54.28.33.60/page1",  
            app_private_key_path="../KEYS/app-private-2048.txt",
            alipay_public_key_path="../KEYS/alipay-public-2048.txt",  
            return_url="http://54.28.33.60/page2",  
            debug=True,  # 默认False,
        )

        verify_result = alipay.verify(processed_dict,sign)  # verify方法会解析所接收的数据，得到是否支付成功的结果，True or False
        if verify_result 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)

            '''order_sn,trade_no,trade_status都是支付宝返回的订单状态，我们 就可以根据这些状态进行其他操作，如修改数据库订单状态等......'''
            
            return Response('success')  # 最后记着给支付宝返回一个信息
        else:
            '''如果verify_result为False，则说明可能是其他恶意请求访问，直接忽略就行'''
            pass   

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