Added custom redirection url after authorization

MyWebsite/MyWebsite/Controllers/AdminController.cs

@@ -10,6 +10,7 @@ using MyWebsite.Models;
 using MyWebsite.Models.Databases;
 using MyWebsite.ViewModels;
 
+#pragma warning disable CA1054 // Uri parameters should not be strings
 namespace MyWebsite.Controllers
 {
 	[Authorize]
@@ -22,15 +23,15 @@ namespace MyWebsite.Controllers
 
 		[AllowAnonymous]
 		[HttpGet]
-		public IActionResult Login() =>
+		public IActionResult Login(string ReturnUrl) =>
-			View(new CredentialViewModel(Database));
+			View(new CredentialViewModel(Database, ReturnUrl));
 
 		[AllowAnonymous]
 		[HttpPost]
 		[ValidateAntiForgeryToken]
 		public async Task<IActionResult> Login(CredentialViewModel model)
 		{
-			if (!ModelState.IsValid)
+			if (!ModelState.IsValid || model == null)
 			{
 				ModelState.AddModelError("Authorization error", "Invalid data");
 				return View(new CredentialViewModel(Database, model));
@@ -52,7 +53,7 @@ namespace MyWebsite.Controllers
 			ClaimsIdentity id = new ClaimsIdentity(new Claim[] { claim }, "ApplicationCookie", ClaimsIdentity.DefaultNameClaimType, ClaimsIdentity.DefaultRoleClaimType);
 			await HttpContext.SignInAsync(CookieAuthenticationDefaults.AuthenticationScheme, new ClaimsPrincipal(id)).ConfigureAwait(false);
 
-			return RedirectToAction("Index", "Admin");
+			return Redirect(model.ReturnUrl ?? "/Admin");
 		}
 
 		public async Task<IActionResult> Logout()

MyWebsite/MyWebsite/ViewModels/CredentialViewModel.cs

@@ -1,13 +1,19 @@
 using MyWebsite.Models;
 using MyWebsite.Models.Databases;
 
+#pragma warning disable CA1054 // Uri parameters should not be strings
+#pragma warning disable CA1056 // Uri properties should not be strings
 namespace MyWebsite.ViewModels
 {
 	public class CredentialViewModel : ViewModelBase
 	{
 		public CredentialModel Credential { get; set; }
+		public string ReturnUrl { get; set; }
 		public CredentialViewModel(DatabaseContext context) : base(context) { }
 
+		public CredentialViewModel(DatabaseContext context, string returnUrl) : base(context) =>
+			ReturnUrl = returnUrl;
+
 		public CredentialViewModel() : base(null) { }
 		public CredentialViewModel(DatabaseContext context, CredentialViewModel model) : base(context) =>
 			Credential = model?.Credential;

MyWebsite/MyWebsite/Views/Admin/Login.cshtml

@@ -10,6 +10,7 @@
 <article>
 	<form asp-action="Login" asp-antiforgery="true">
 		<div asp-validation-summary="All" class="validation-error"></div>
+		<input hidden asp-for="ReturnUrl" />
 		<div>
 			<label asp-for="Credential.Email">E-mail</label>
 			<input type="email" asp-for="Credential.Email" />
@@ -20,7 +21,8 @@
 			<input type="password" asp-for="Credential.Password" />
 			<span asp-validation-for="Credential.Password"></span>
 		</div>
-		<input class="btn" style="margin-top:10px" type="submit" value="Login" />
+
+		<input type="submit" value="Login" />
 	</form>
 </article>