Adding confirmEmail scaffolding

- Also updating the UrlHelpExtensions to not have a dependency on the AccountController

src/Web/Areas/Identity/Pages/Account/ConfirmEmail.cshtml

@@ -0,0 +1,12 @@
+@page
+@model ConfirmEmailModel
+@{
+    ViewData["Title"] = "Confirm email";
+}
+
+<h2>@ViewData["Title"]</h2>
+<div>
+    <p>
+        Thank you for confirming your email.
+    </p>
+</div>

src/Web/Areas/Identity/Pages/Account/ConfirmEmail.cshtml.cs

@@ -0,0 +1,45 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Identity;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+using Microsoft.eShopWeb.Infrastructure.Identity;
+
+namespace Microsoft.eShopWeb.Web.Areas.Identity.Pages.Account
+{
+    [AllowAnonymous]
+    public class ConfirmEmailModel : PageModel
+    {
+        private readonly UserManager<ApplicationUser> _userManager;
+
+        public ConfirmEmailModel(UserManager<ApplicationUser> userManager)
+        {
+            _userManager = userManager;
+        }
+
+        public async Task<IActionResult> OnGetAsync(string userId, string code)
+        {
+            if (userId == null || code == null)
+            {
+                return RedirectToPage("/Index");
+            }
+
+            var user = await _userManager.FindByIdAsync(userId);
+            if (user == null)
+            {
+                return NotFound($"Unable to load user with ID '{userId}'.");
+            }
+
+            var result = await _userManager.ConfirmEmailAsync(user, code);
+            if (!result.Succeeded)
+            {
+                throw new InvalidOperationException($"Error confirming email for user with ID '{userId}':");
+            }
+
+            return Page();
+        }
+    }
+}

src/Web/Extensions/UrlHelperExtensions.cs

@@ -1,14 +1,12 @@
-using Microsoft.eShopWeb.Web.Controllers;
-
-namespace Microsoft.AspNetCore.Mvc
+namespace Microsoft.AspNetCore.Mvc
 {
     public static class UrlHelperExtensions
     {
         public static string EmailConfirmationLink(this IUrlHelper urlHelper, string userId, string code, string scheme)
         {
             return urlHelper.Action(
-                action: nameof(AccountController.ConfirmEmail),
-                controller: "Account",
+                action: "GET",
+                controller: "ConfirmEmail",
                 values: new { userId, code },
                 protocol: scheme);
         }