支付宝接口

conf.py

import os
# o_你自己的应用ID
app_id = "***********"
# 支付宝收到用户的支付，会向商户发两个请求，一个get请求，一个post请求
# o_你自己公网服务器处理支付宝回调的POST请求，验证订单
notify_url = "http://39.100.233.226:8000/order/aliback/"
# o_你自己公网服务器处理支付宝回调的GET请求，将订单结果展现给用户
return_url = "http://39.100.233.226:8000/order/aliback/"
# o_你自己的私钥
alipay_private_key_path = os.path.join(os.path.dirname(__file__), 'alipay_private_2048.txt')
# o_你自己的公钥
alipay_public_key_path = os.path.join(os.path.dirname(__file__), 'alipay_public_2048.txt')

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 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("
", "")
        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)

payinit.py

from .pay import AliPay
import os
from . import conf
def ali_init():
    # o_你自己的应用ID
    app_id = conf.app_id
    # 支付宝收到用户的支付，会向商户发两个请求，一个get请求，一个post请求
    # o_你自己公网服务器处理支付宝回调的POST请求，验证订单
    notify_url = conf.notify_url
    # # o_你自己公网服务器处理支付宝回调的GET请求，将订单结果展现给用户
    return_url = conf.return_url
    # o_你自己的私钥
    alipay_private_key_path = conf.alipay_private_key_path
    # o_你自己的公钥
    alipay_public_key_path = conf.alipay_public_key_path

    alipay = AliPay(
        appid=app_id,
        app_notify_url=notify_url,
        return_url=return_url,
        app_private_key_path=alipay_private_key_path,
        alipay_public_key_path=alipay_public_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 alipay

alipay_public_2048

-----BEGIN PUBLIC KEY-----  # 要用自己的公钥去换ali的公钥
...
-----END PUBLIC KEY-----

alipay_private_2048

-----BEGIN RSA PRIVATE KEY-----
...
-----END RSA PRIVATE KEY-----

后台接口实现

from rest_framework.views import APIView
from utils.APIResponse import APIResponse


from rest_framework_jwt.authentication import JSONWebTokenAuthentication
from rest_framework.permissions import IsAuthenticated

from libs.alipay import payinit
# 根据商品信息生成订单号与支付宝链接
import time
from django.core.cache import cache
class OrderAPIView(APIView):
    authentication_classes = [JSONWebTokenAuthentication]
    permission_classes = [IsAuthenticated]
    def post(self, request, *args, **kwargs):
        alipay = payinit.ali_init()
        trade_no = str(time.time()).replace('.', '1')

        # 考虑信息安全性，订单最终的金额一定是前后台双方校验决定
        subject = request.data.get('subject')
        money = request.data.get('money')

        # 对信息要进行校验
        if not (subject and money):
            return APIResponse(1, '订单信息有误！')

        query_params = alipay.direct_pay(
            subject=subject,
            out_trade_no=trade_no,
            total_amount=money,
        )
        trade_url = "https://openapi.alipaydev.com/gateway.do?{}".format(query_params)

        # 服务器存储订单信息：订单状态 False - 未支付 - mysql中也需要存储 order id no status user_id
        cache.set(trade_no, False)

        return APIResponse(0, 'ok', {
            'trade_no': trade_no,
            'trade_url': trade_url
        })


from rest_framework.response import Response
from utils.logging import logger
class AlibackAPIView(APIView):
    def post(self, request, *args, **kwargs):
        # 初始化alipay
        alipay = payinit.ali_init()
        # 检测是否支付成功
        # 去请求体中获取所有返回的数据：状态/订单号
        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]
        logger.warning("^_^: %s" % post_dict)

        sign = post_dict.pop('sign', None)
        # 通过调用alipay的verify方法去二次认证
        status = alipay.verify(post_dict, sign)
        if status:  # 订单状态在此修改
            logger.warning("^_^: %s" % post_dict)
            pass
        return Response('验证成功')

    def get(self, request, *args, **kwargs):  
        '''
        支付宝先给你发一个get请求测试你的服务器是否存活,
        再发送post请求给你返回真实的数据
        '''
        # 初始化alipay
        alipay = payinit.ali_init()

        params = request.GET.dict()
        sign = params.pop('sign', None)
        status = alipay.verify(params, sign)
        print('GET验证', status)
        if status:
            # 获取订单状态，显示给用户
            return Response('支付成功')