qrcodeService/QRCodeService/Controllers/RedirectController.cs

using Microsoft.AspNetCore.Http.Extensions;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.WebUtilities;
using QRCodeService.Application.Queries;
using QRCodeService.Extensions;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace QRCodeService.Controllers
{
    [Route("r/{shortCode}")]
    public class RedirectController : Controller
    {
        private readonly ILinkQueries linkQueries;
        private readonly IAppQueries appQueries;

        public RedirectController(ILinkQueries queries, IAppQueries appQueries)
        {
            this.linkQueries = queries;
            this.appQueries = appQueries;
        }
        [HttpGet]
        public async Task<IActionResult> Index(string shortCode)
        {
            var link = await linkQueries.GetLinkAsync(shortCode);
            if (link == null)
            {
                return BadRequest();
            }
            var app = await appQueries.GetAppAsync(link.AppId);
            if (app == null)
            {
                return BadRequest();
            }
            var t = DateTime.Now.ToString("yyyyMMddHHmmss");
            var sign = BitConverter.ToString($"{t}{app.Appkey}".ToMD5()).Replace("-", "");
            ViewBag.FullUrl = QueryHelpers.AddQueryString(link.FullUrl, new Dictionary<string, string> {
                { "s",sign },
                { "t",t}
            });

            return View();
        }
    }
}