refact

Controllers/HomeController.cs

@@ -3,13 +3,27 @@ using System.Collections.Generic;
 using System.Diagnostics;
 using System.Linq;
 using System.Threading.Tasks;
+using IdentityServer4.Services;
+using Microsoft.AspNetCore.Hosting;
 using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.Logging;
 using nuget_host.Models;
 
 namespace nuget_host.Controllers
 {
     public class HomeController : Controller
     {
+        private readonly IIdentityServerInteractionService _interaction;
+        private readonly ILogger _logger;
+        IHostingEnvironment _environment;
+
+        public HomeController(IIdentityServerInteractionService interaction, Microsoft.AspNetCore.Hosting.IHostingEnvironment environment, ILogger<HomeController> logger)
+        {
+            _interaction = interaction;
+            _environment = environment;
+            _logger = logger;
+        }
+        
         public IActionResult Index()
         {
             return View();
@@ -37,9 +51,28 @@ namespace nuget_host.Controllers
         }
 
 
-        public IActionResult Error()
+        /// <summary>
+        /// Shows the error page
+        /// </summary>
+        public async Task<IActionResult> Error(string errorId)
         {
-            return View(new ErrorViewModel { RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier });
+            var vm = new ErrorViewModel();
+
+            // retrieve error details from identityserver
+            var message = await _interaction.GetErrorContextAsync(errorId);
+            if (message != null)
+            {
+                vm.Error = message;
+
+                if (!_environment.IsDevelopment())
+                {
+                    // only show in development
+                    message.ErrorDescription = null;
+                }
+            }
+
+            return View("Error", vm);
         }
+
     }
 }