General.Web/Controllers/API/NotifyController.cs

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using System;
using System.Threading.Tasks;
using System.Xml;
using Essensoft.AspNetCore.Payment.Alipay;
using Essensoft.AspNetCore.Payment.Alipay.Notify;
using Essensoft.AspNetCore.Payment.Alipay.Utility;
using Essensoft.AspNetCore.Payment.WeChatPay;
using Essensoft.AspNetCore.Payment.WeChatPay.Notify;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Options;

namespace General.Mvc.Controllers.API
{
    #region 支付宝异步通知

    [Route("notify/alipay")]
    public class AlipayNotifyController : Controller
    {
        private readonly IAlipayNotifyClient _client;
        private readonly IOptions<AlipayOptions> _optionsAccessor;

        public AlipayNotifyController(IAlipayNotifyClient client, IOptions<AlipayOptions> optionsAccessor)
        {
            _client = client;
            _optionsAccessor = optionsAccessor;
        }

        /// <summary>
        /// 应用网关
        /// </summary>
        /// <returns></returns>
        [Route("gateway")]
        [HttpPost]
        public async Task<IActionResult> Gateway()
        {
            try
            {
                var service = Request.Form["service"].ToString();
                switch (service)
                {
                    // 激活开发者模式
                    case "alipay.service.check":
                        {
                            var options = _optionsAccessor.Value;

                            // 获取参数
                            var parameters = _client.GetParameters(Request);
                            var sign = parameters["sign"];
                            parameters.Remove("sign");

                            var signContent = AlipaySignature.GetSignContent(parameters);

                            // 验签
                            var isSuccess = AlipaySignature.RSACheckContent(signContent, sign, options.AlipayPublicKey, "GBK", options.SignType);

                            // 组XML响应内容
                            var response = MakeVerifyGWResponse(isSuccess, options.AlipayPublicKey, options.AppPrivateKey, "GBK", options.SignType);

                            return Content(response, "text/xml");
                        }