make backend for my site

Controllers/RedirectController.cs

@@ -0,0 +1,34 @@
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.Caching.Memory;
+using yawaflua.ru.Models;
+using yawaflua.ru.Models.Tables;
+using yawaflua.ru.Utilities;
+
+namespace yawaflua.ru.Controllers
+{
+    [Route("/r/")]
+    [Authorize]
+    public class RedirectController : ControllerBase
+    {
+        private AppDbContext ctx;
+        private MemoryCache cache;
+        public RedirectController(AppDbContext ctx, MemoryCache cache) 
+        {
+            this.ctx = ctx;
+            this.cache = cache;
+        }
+        [HttpGet("{uri}")]
+        public async Task<IActionResult> FromGitHub(string uri)
+        {
+            Console.WriteLine(uri);
+            Redirects redirects;
+            if (!cache.TryGetValue($"redirectsWithUrl-{uri}", out redirects) || ctx.Redirects.TryGetValue(k => k.uri == uri, out redirects))
+                cache.Set($"redirectsWithUrl-{uri}", redirects, DateTime.Now.AddMinutes(10));
+            
+            return Redirect(redirects?.redirectTo ?? "/404");
+
+        }
+    }
+}