29.创建订单并生成支付链接接口

1. syl/settings.py 中配置支付相关参数

# 支付宝配置
ALIPAY_APPID = '2016102600762786'  # 沙箱环境中alipay应用ID

ALIPAY_DEBUG = True

# alipay沙箱环境支付宝网关
ALIPAY_URL = 'https://openapi.alipaydev.com/gateway.do'

# 支付完成后支付宝回调我们应用的地址
ALIPAY_RETURN_URL = 'http://127.0.0.1:8888/payment/callback/'

2. goods/utils.py 中生成随机订单函数和生成支付URL函数

# -*- coding: utf-8 -*-
import datetime
import os
import random

from alipay import AliPay
from syl import settings


# 获取文件路径
app_private_key_path = os.path.join(settings.BASE_DIR, "apps/goods/keys/app_private_key.pem")
alipay_public_key_path = os.path.join(settings.BASE_DIR, "apps/goods/keys/alipay_public_key.pem")

with open(app_private_key_path) as f:
    app_private_key_string = f.read()

with open(alipay_public_key_path) as f:
    alipay_public_key_string = f.read()

# 创建支付宝支付对象
alipay = AliPay(
    appid=settings.ALIPAY_APPID,
    app_notify_url=None, # 默认回调url
    app_private_key_string=app_private_key_string,
    alipay_public_key_string=alipay_public_key_string,
    # app_private_key_path=app_private_key_path,
    # alipay_public_key_path=alipay_public_key_path,
    sign_type="RSA2",
    debug=settings.ALIPAY_DEBUG
)


def get_pay_url(out_trade_no, total_amount, subject):
    # 生成登录支付宝连接
    order_string = alipay.api_alipay_trade_page_pay(
        out_trade_no=out_trade_no,
        total_amount=str(total_amount),
        subject=subject,
        return_url=settings.ALIPAY_RETURN_URL,
    )
    # 响应登录支付宝连接
    # 真实环境电脑网站支付网关：https://openapi.alipay.com/gateway.do? + order_string
    # 沙箱环境电脑网站支付网关：https://openapi.alipaydev.com/gateway.do? +order_string
    alipay_url = settings.ALIPAY_URL + "?" + order_string
    return alipay_url


def get_order_id():
    """
    SYL202008241212121200005/24
    生成订单号: 格式: SYL + 年月日时分秒 + 5位随机数
    :return:
    """
    d = datetime.datetime.now()
    base = 'SYL'
    time_str = '%04d%02d%02d%02d%02d%02d' % (d.year, d.month, d.day, d.hour,
                                             d.minute, d.second)
    rand_num = str(random.randint(10000, 99999))
    return base + time_str + rand_num

3. goods/views.py 中写视图函数

from rest_framework.views import APIView
from rest_framework.permissions import AllowAny, IsAuthenticated
from rest_framework.response import Response
from .models import Goods, Orders
from .utils import get_order_id, get_pay_url, alipay


class PayUrlView(APIView):
    permission_classes = (IsAuthenticated,)

    def post(self, request):
        # 1. 获取课程id,获取购买途径(普通购买, 促销购买) 获取用户
        goods_id = request.data.get('goods_id')
        goods = Goods.objects.get(id=goods_id)
        user = request.user
        # 2. 下定单
        order_id = get_order_id()
        if user.vip.vip_type == '1':    # 普通会员
            goods_price = goods.price * Decimal('0.80').quantize(Decimal('0.00'))
        elif user.vip.vip_type == '2':  # 高级会员
            goods_price = goods.price * Decimal('0.60').quantize(Decimal('0.00'))
        else:   # 普通用户
            goods_price = goods.price
        goods_price = Decimal(goods_price).quantize(Decimal('0.00'))
        order = Orders(user=user, goods=goods, order_id=order_id, pay_method=1,
                       status=1, total_amount=goods_price)
        order.save()
        # print(order.total_amount, type(order.total_amount))
        # 3. 根据订单 生成支付链接
        subject = "实验楼订单:%s, 价格:%s" % (order.order_id, order.total_amount)
        pay_url = get_pay_url(order.order_id, order.total_amount, subject)

        # 4. 返回链接
        return Response({"code": 0, "msg": "下单成功", "data": {"pay_url": pay_url}})

4. goods/urls 中注册路由

urlpatterns = [
    path('getpayurl/', views.PayUrlView.as_view()),      # /goods/getpayurl/
]

5. 测试

• 请求地址

http://192.168.56.100:8888/goods/getpayurl/

• 携带参数

{
	"goods_id":1
}

• 返回数据

{
"code":0,
"msg":"下单成功",
"data":{
    "pay_url":"https://openapi.alipaydev.com/gateway.do?
    app_id=2016101800716047&biz_content=%7B%22subject%22%3A%22%5Cu5b9e%5Cu9a8c%5Cu697
    c%5Cu8ba2%5Cu5355%3ASYL2020101216322149584%2C+%5Cu4ef7%5Cu683c%3A99.00%22%2C%22ou
    t_trade_no%22%3A%22SYL2020101216322149584%22%2C%22total_amount%22%3A%2299.00%22%2
C%22product_code%22%3A%22FAST_INSTANT_TRADE_PAY%22%7D&charset=utf8&method=alipay.trade.page.pay&return_url=http%3A%2F%2F127.0.0.1%3A8888%2Fpayment
    %2Fcallback%2F&sign_type=RSA2×tamp=2020-10-
    12+16%3A32%3A21&version=1.0&sign=qIM7yrjYgvqOn2DCYK4rBgtwqDnZ%2BTwf89axXQPMzk67FO
    OHH18YtnoROi4ml5i5w%2Fd%2FtD2RsYyxU5Jeatxw9Skz%2B9HQCAYfmQriYDo5fz2hOrC6Ydx92z5%2
    BB5o%2BUIh29EAE8JS5MhUOOO8T3r9NtzmQTOs0kSWpnaXjX4S7l9Z83li76MG83H18jBodpWofgzcTTD
    dPsBnaHmeeJjGg9LKgSDS37ZKP9GE79asVn8S9w49qVmTPzZGdKIZxyLf2K44EllnGxhlDLFRlGLYJOlE
    %2Bxo1hr3IKH40WoYh3fkmv2%2FEDnl0OtNXHt5HRUH4uZ2k38BNf1ebrODRqWRg1eQ%3D%3D"
    }
}