django2.0调用支付宝支付接口完成扫码支付

准备工作：

1.蚂蚁金服开放平台注册账号：https://openhome.alipay.com/platform/appDaily.htm?tab=info
2.开发者中心 --> 研发服务 --> 沙箱应用（测试环境）
3.设置应用公钥，按照提示下载**生成工具，生成**，将商户应用公钥复制拷贝到对应位置并保存，生成的**文件妥善保存
4.点击查看支付宝公钥，将支付宝公钥复制到一个新文件中保存
5. 需要加密方面的模块 pip install pycryptodome
6. 手机上下载沙箱钱包可做测试使用

代码实现：

目录结构

pay.py 文件

import json
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

class AliPay(object):
    """
    支付宝支付接口(PC端)
    """

    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 ordered_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)

view.py 文件

import random
import time
from django.http import HttpResponse
from django.shortcuts import redirect, render
from django.contrib.auth import get_user_model
from utils.pay import AliPay
from xfz.settings import AliPayConfig
# 注意：uid参数可不要，此处因生成订单号要使用，所以添加，测试证明沙箱环境下添加自定义参数回调函数也可正常访问，正式环境下还没有测试，待测试后再做说明

# 充值页面
def pay_page(request):
    return render(request, 'user_center/pay_page.html')


# 生成订单号(自定义)
def order_num(package_num,uid):
    '''
    商品代码后两位+下单时间后十二位+用户id后四位+随机数四位
    :param package_num: 商品代码
    :return: 唯一的订单号
    '''
    local_time = time.strftime('%Y%m%d%H%M%S',time.localtime(time.time()))[2:]
    result = str(package_num)[-2:] + local_time +uid[-4:]+str(random.randint(1000,9999))
    return result


# 获取一个Alipay对象
def get_ali_object(uid):
    # 沙箱环境地址：https://openhome.alipay.com/platform/appDaily.htm?tab=info
    # 正式启用时需要重新配置app_id ，merchant_private_key_path ，alipay_public_key_path
    app_id = AliPayConfig.app_id  # APPID  沙箱应用

    # 支付完成后支付宝向这里发送一个post请求，如果识别为局域网ip，支付宝找不到，alipay_result（）接受不到这个请求
    notify_url = AliPayConfig.notify_url+uid+'/'

    # 支付完成后跳转的地址
    return_url = AliPayConfig.return_url+uid+'/'

    # 应用私钥
    merchant_private_key_path = AliPayConfig.merchant_private_key_path
    # 支付宝公钥
    alipay_public_key_path = AliPayConfig.alipay_public_key_path # 验证支付宝回传消息使用

    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,
        debug=True  # 默认False 设置是否是沙箱环境
    )
    return alipay


# 账户充值（支付宝）
def alipay(request, uid):
    '''根据当前用户的配置生成url，并跳转'''

    money = float(request.POST.get('money'))
    alipay = get_ali_object(uid)
    # 生成支付的url
    query_params = alipay.direct_pay(
        subject='充值到XXX',  # 订单名称
        out_trade_no=order_num('xx',uid),  # 用户购买商品订单号（每次不一样）
        total_amount=money  # 交易金额
    )
    # 支付url
    pay_url = "https://openapi.alipaydev.com/gateway.do?{0}".format(query_params)  # 支付宝网关地址（沙箱应用）
    return redirect(pay_url)


# 支付成功后回调函数（支付宝）
def alipay_result(request,uid):
    alipay = get_ali_object(uid)
    if request.method == "POST":  # POST方法后台回调，只能在外网服务器测试
        # 检测是否支付成功
        # 去请求体中获取所有返回的参数：状态/订单号
        post_dict = request.POST.dict()
        sign = post_dict.pop('sign', None)
        money = post_dict['total_amount']
        status = alipay.verify(post_dict, sign)  # 验签
        if status:
        	'''
        	支付成功后业务逻辑
        	'''
			return HttpResponse('success')
        else:
        	'''
        	支付失败后业务逻辑
        	'''
            return HttpResponse('')

    else:   # GET请求 前台回调
        params = request.GET.dict()
        sign = params.pop('sign', None)
        status = alipay.verify(params, sign)  # 验签
        if status:
            return HttpResponse('支付成功')
        else:
            return HttpResponse('支付失败')

urls.py 文件

from django.urls import path
from . import views

app_name = 'pay'

urlpatterns = [
    path('alipay/<str:uid>/',views.alipay,name='alipay'),
    path('alipay_result/<str:uid>/',views.alipay_result,name='alipay_result'),
    path('pay_page/',views.pay_page,name='pay_page'),
]

sittings.py 文件

# 支付宝参数配置
class AliPayConfig(object):
    # 正式启用时需要重新配置app_id ，merchant_private_key_path ，alipay_public_key_path
    app_id = "xxx"  # APPID  沙箱应用

    # 支付完成后支付宝向这里发送一个post请求，如果识别为局域网ip，支付宝找不到，alipay_result（）接受不到这个请求
    notify_url = "http://127.0.0.1:8000/pay/alipay_result/"

    # 支付完成后跳转的地址
    return_url = "http://127.0.0.1:8000/pay/alipay_result/"

    # 应用私钥
    merchant_private_key_path = "keys/app_private_2048.txt"
    # 支付宝公钥
    alipay_public_key_path = "keys/alipay_public_2048.txt"  # 验证支付宝回传消息使用

效果图

参考：
1.https://blog.csdn.net/lmw1239225096/article/details/79416474
2.https://www.cnblogs.com/ctztake/p/8513628.html

以上代码仅供参考，如直接用于商用，出现任何问题概不负责。