概要
本文是关于django集成支付宝【电脑网站支付】功能的过程记录。
功能逻辑主要分为两块：
- 用户下单跳转至支付宝支付界面
- 支付成功的回调验证
本文用到的alipay-sdk是基于阿里开发文档http接口请求规则的初步封装，也并非是本人原创。但真实上线门槛略高，需要企业营业执照，对个体程序员不是很友好，而且还要收取0.6%的手续费，不得不吐糟一下。
python 支付接口
# pip install pycryptodome
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, encodebytes
import json
class AliPay(object):
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.import_key(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)
跳转支付界面
class OrderView(View):
def get(self,request,*args,**kwargs):
total_amount = request.GET.get('total_amount')
subject = request.GET.get('subject')
out_trade_no = request.GET.get('out_trade_no')
# 业务逻辑【保存订单】
# 跳转支付页面
alipay = AliPay(
appid="2016101100660254",
app_notify_url="http://127.0.0.1:8000/checkout/verify/",
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/checkout/verify/"
)
query_params = alipay.direct_pay(
subject=subject, # 商品简单描述
out_trade_no=out_trade_no, # 商户订单号
total_amount=total_amount, # 金额
)
pay_url = "https://openapi.alipaydev.com/gateway.do?{}".format(query_params)
return redirect(pay_url)
回调验证
class AlipayView(View):
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] = value
sign = processed_dict.pop("sign", None)
alipay = AliPay(
appid="2016101100660254",
app_notify_url="http://127.0.0.1:8000/checkout/verify/",
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/checkout/verify/"
)
condition = alipay.verify(processed_dict, sign)
if condition:
# 更改订单状态
return HttpResponse('支付成功')
def 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] = value
sign = processed_dict.pop("sign", None)
alipay = AliPay(
appid="",
app_notify_url="http://127.0.0.1:8000/checkout/verify/",
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/checkout/verify/"
)
condition = alipay.verify(processed_dict, sign)
if condition:
# 更改订单状态
return HttpResponse("支付成功")
关于return_url 和notify_url
