added login stuff

Components/Account/IdentityRedirectManager.cs

@@ -0,0 +1,59 @@
+using Microsoft.AspNetCore.Components;
+using System.Diagnostics.CodeAnalysis;
+
+namespace ApplianceRepair.Components.Account
+{
+    internal sealed class IdentityRedirectManager(NavigationManager navigationManager)
+    {
+        public const string StatusCookieName = "Identity.StatusMessage";
+
+        private static readonly CookieBuilder StatusCookieBuilder = new()
+        {
+            SameSite = SameSiteMode.Strict,
+            HttpOnly = true,
+            IsEssential = true,
+            MaxAge = TimeSpan.FromSeconds(5),
+        };
+
+        [DoesNotReturn]
+        public void RedirectTo(string? uri)
+        {
+            uri ??= "";
+
+            // Prevent open redirects.
+            if (!Uri.IsWellFormedUriString(uri, UriKind.Relative))
+            {
+                uri = navigationManager.ToBaseRelativePath(uri);
+            }
+
+            // During static rendering, NavigateTo throws a NavigationException which is handled by the framework as a redirect.
+            // So as long as this is called from a statically rendered Identity component, the InvalidOperationException is never thrown.
+            navigationManager.NavigateTo(uri);
+            throw new InvalidOperationException($"{nameof(IdentityRedirectManager)} can only be used during static rendering.");
+        }
+
+        [DoesNotReturn]
+        public void RedirectTo(string uri, Dictionary<string, object?> queryParameters)
+        {
+            var uriWithoutQuery = navigationManager.ToAbsoluteUri(uri).GetLeftPart(UriPartial.Path);
+            var newUri = navigationManager.GetUriWithQueryParameters(uriWithoutQuery, queryParameters);
+            RedirectTo(newUri);
+        }
+
+        [DoesNotReturn]
+        public void RedirectToWithStatus(string uri, string message, HttpContext context)
+        {
+            context.Response.Cookies.Append(StatusCookieName, message, StatusCookieBuilder.Build(context));
+            RedirectTo(uri);
+        }
+
+        private string CurrentPath => navigationManager.ToAbsoluteUri(navigationManager.Uri).GetLeftPart(UriPartial.Path);
+
+        [DoesNotReturn]
+        public void RedirectToCurrentPage() => RedirectTo(CurrentPath);
+
+        [DoesNotReturn]
+        public void RedirectToCurrentPageWithStatus(string message, HttpContext context)
+            => RedirectToWithStatus(CurrentPath, message, context);
+    }
+}