关于Django集成支付宝应用的开发

支付宝应用的开发"/>

关于Django集成支付宝应用的开发

关于Web集成支付宝应用的开发

最近阅读了支付宝开发相关的文档，自己也做了一些关于集成web上开发第三方应用的总结。

关于密钥：
这里的RSA2密钥是需要我们自己生成并上传的，这里我们需要使用RAS签名验签工具来自动生成我们商户的私钥和公钥

接下来我们需要将他们保存到我们的项目中去，在这里最重要的时自己的私钥和支付宝给我们的公钥

当我们向支付宝时请求数据时我们用自己的密钥进行加密，接着利用支付宝给我们的公钥来传递信息给它，支付宝使用它的私钥来判断我们传递的信息有没有被截获

关于签名：
接下来我们根据支付宝的文档来生成关键字，以下为文档链接
.trade.pay

我们需要对文档里面的参数首先进行排序，然后不要忘了对其base64编码，最终得到签名字符串，拿到签名我们就可以请求到支付界面url了。
以下为具体的alipay.py代码

from datetime import datetime
from Crypto.PublicKey import RSA
from Crypto.Signature import PKCS1_v1_5
from Crypto.Hash import SHA256
from base64 import b64encode, b64decode
from urllib.parse import quote_plus
from urllib.parse import urlparse, parse_qs
from urllib.request import urlopen
from base64 import decodebytes, encodebytesimport jsonclass AliPay(object):"""支付宝支付接口"""def __init__(self, appid, app_notify_url, app_private_key_path,alipay_public_key_path, return_url, debug=False):self.appid = appidself.app_notify_url = app_notify_urlself.app_private_key_path = app_private_key_pathself.app_private_key = Noneself.return_url = return_urlwith open(self.app_private_key_path) as fp:self.app_private_key = RSA.importKey(fp.read())self.alipay_public_key_path = alipay_public_key_pathwith open(self.alipay_public_key_path) as fp:self.alipay_public_key = RSA.import_key(fp.read())if debug is True:self.__gateway = ".do"else:self.__gateway = ".do"#这里的biz_content为具体的请求参数def direct_pay(self, subject, out_trade_no, total_amount, return_url=None, **kwargs):biz_content = {"subject": subject, #名称"out_trade_no": out_trade_no,  #订单号"total_amount": total_amount, #商品数量"product_code": "FAST_INSTANT_TRADE_PAY", #交易code# "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_urldata["return_url"] = self.return_urlreturn data#十分重要的签名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_stringdef 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()])#排序完成生成签名字符串def sign(self, unsigned_string):# 开始计算签名key = self.app_private_keysigner = 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 signdef _verify(self, raw_content, signature):# 开始计算签名key = self.alipay_public_keysigner = PKCS1_v1_5.new(key)digest = SHA256.new()digest.update(raw_content.encode("utf8"))if signer.verify(digest, decodebytes(signature.encode("utf8"))):return Truereturn False#验证数据是否合法，支付宝会将我们的数据与支付宝的支付数据进行比对，支付宝会在return_url转递数据到本地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)if __name__ == "__main__":return_url = 'http://127.0.0.1:8000/?total_amount=100.00&timestamp=2017-08-15+23%3A53%3A34&sign=e9E9UE0AxR84NK8TP1CicX6aZL8VQj68ylugWGHnM79zA7BKTIuxxkf%2FvhdDYz4XOLzNf9pTJxTDt8tTAAx%2FfUAJln4WAeZbacf1Gp4IzodcqU%2FsIc4z93xlfIZ7OLBoWW0kpKQ8AdOxrWBMXZck%2F1cffy4Ya2dWOYM6Pcdpd94CLNRPlH6kFsMCJCbhqvyJTflxdpVQ9kpH%2B%2Fhpqrqvm678vLwM%2B29LgqsLq0lojFWLe5ZGS1iFBdKiQI6wZiisBff%2BdAKT9Wcao3XeBUGigzUmVyEoVIcWJBH0Q8KTwz6IRC0S74FtfDWTafplUHlL%2Fnf6j%2FQd1y6Wcr2A5Kl6BQ%3D%3D&trade_no=2017081521001004340200204115&sign_type=RSA2&auth_app_id=2016080600180695&charset=utf-8&seller_id=2088102170208070&method=alipay.trade.page.pay.return&app_id=2016080600180695&out_trade_no=20170202185&version=1.0'o = urlparse(return_url)query = parse_qs(o.query)processed_query = {}ali_sign = query.pop("sign")[0]alipay = AliPay(appid="",app_notify_url="http://127.0.0.1:8000/alipay/return/",app_private_key_path="../trade/keys/private_2048.txt",  #个人的私钥alipay_public_key_path="../trade/keys/alipay_key_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,debug=True,  # 默认False,return_url="http://127.0.0.1:8000/alipay/return/")for key, value in query.items():processed_query[key] = value[0]print (alipay.verify(processed_query, ali_sign))url = alipay.direct_pay(subject="测试订单2",out_trade_no="20170202sss",total_amount=100,return_url="http://127.0.0.1:8000/alipay/return/")re_url = ".do?{data}".format(data=url)print(re_url)

return_url 是当我们完成支付后自动跳转的url
app_notify_url是一个异步请求url，当用户扫码后自动生成的url，直接与支付宝关联，而不是当前页面
这两个url比较重要，不能出错

关于代码集成到Django框架:
这里我使用的时drf框架，所以可以使用drf框架提供的serilazerMethodField来自己定义一个field字段，这里我们使用支付的url，并对其进行验证

from rest_framework.views import APIView
from utils.alipay import AliPay
from MxShop.settings import ali_pub_key_path, private_key_path
from rest_framework.response import Response
class AlipayView(APIView):def get(self, request):"""处理支付宝的return_url返回:param request::return:"""processed_dict = {}for key, value in request.GET.items():processed_dict[key] = valuesign = processed_dict.pop("sign", None)alipay = AliPay(appid="",app_notify_url="http://127.0.0.1:8000/alipay/return/",app_private_key_path=private_key_path,alipay_public_key_path=ali_pub_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_url="http://127.0.0.1:8000/alipay/return/")verify_re = alipay.verify(processed_dict, sign)if verify_re 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)existed_orders = OrderInfo.objects.filter(order_sn=order_sn)for existed_order in existed_orders:existed_order.pay_status = trade_statusexisted_order.trade_no = trade_noexisted_order.pay_time = datetime.now()existed_order.save()response = redirect("index")response.set_cookie("nextPath","pay", max_age=3)return responseelse:response = redirect("index")return responsedef post(self, request):"""处理支付宝的notify_url:param request::return:"""processed_dict = {}for key, value in request.POST.items():processed_dict[key] = valuesign = processed_dict.pop("sign", None)alipay = AliPay(appid="",app_notify_url="http://127.0.0.1:8000/alipay/return/",app_private_key_path=private_key_path,alipay_public_key_path=ali_pub_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_url="http://127.0.0.1:8000/alipay/return/")verify_re = alipay.verify(processed_dict, sign)if verify_re 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)existed_orders = OrderInfo.objects.filter(order_sn=order_sn)for existed_order in existed_orders:order_goods = existed_order.goods.all()for order_good in order_goods:goods = order_good.goodsgoods.sold_num += order_good.goods_numgoods.save()existed_order.pay_status = trade_statusexisted_order.trade_no = trade_noexisted_order.pay_time = datetime.now()existed_order.save()return Response("success")

别忘了在settings里面配置好私钥和支付宝公钥

#支付宝相关配置
private_key_path = os.path.join(BASE_DIR, 'apps/trade/keys/private_2048.txt')
ali_pub_key_path = os.path.join(BASE_DIR, 'apps/trade/keys/alipay_key_2048.txt')