Section 7 - Scaffold Identity Class Library

IdentityManager/Areas/Identity/IdentityHostingStartup.cs

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+using System;
+using IdentityManager.Data;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.AspNetCore.Identity;
+using Microsoft.AspNetCore.Identity.UI;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+
+[assembly: HostingStartup(typeof(IdentityManager.Areas.Identity.IdentityHostingStartup))]
+namespace IdentityManager.Areas.Identity
+{
+    public class IdentityHostingStartup : IHostingStartup
+    {
+        public void Configure(IWebHostBuilder builder)
+        {
+            builder.ConfigureServices((context, services) => {
+            });
+        }
+    }
+}

IdentityManager/Areas/Identity/Pages/Account/AccessDenied.cshtml

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+@page
+@model AccessDeniedModel
+@{
+    ViewData["Title"] = "Access denied";
+}
+
+<header>
+    <h1 class="text-danger">@ViewData["Title"]</h1>
+    <p class="text-danger">You do not have access to this resource.</p>
+</header>

IdentityManager/Areas/Identity/Pages/Account/AccessDenied.cshtml.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+
+namespace IdentityManager.Areas.Identity.Pages.Account
+{
+    public class AccessDeniedModel : PageModel
+    {
+        public void OnGet()
+        {
+
+        }
+    }
+}
+

IdentityManager/Areas/Identity/Pages/Account/ConfirmEmail.cshtml

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+@page
+@model ConfirmEmailModel
+@{
+    ViewData["Title"] = "Confirm email";
+}
+
+<h1>@ViewData["Title"]</h1>

IdentityManager/Areas/Identity/Pages/Account/ConfirmEmail.cshtml.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Identity;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+using Microsoft.AspNetCore.WebUtilities;
+
+namespace IdentityManager.Areas.Identity.Pages.Account
+{
+    [AllowAnonymous]
+    public class ConfirmEmailModel : PageModel
+    {
+        private readonly UserManager<IdentityUser> _userManager;
+
+        public ConfirmEmailModel(UserManager<IdentityUser> userManager)
+        {
+            _userManager = userManager;
+        }
+
+        [TempData]
+        public string StatusMessage { get; set; }
+
+        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}'.");
+            }
+
+            code = Encoding.UTF8.GetString(WebEncoders.Base64UrlDecode(code));
+            var result = await _userManager.ConfirmEmailAsync(user, code);
+            StatusMessage = result.Succeeded ? "Thank you for confirming your email." : "Error confirming your email.";
+            return Page();
+        }
+    }
+}

IdentityManager/Areas/Identity/Pages/Account/ConfirmEmailChange.cshtml

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+@page
+@model ConfirmEmailChangeModel
+@{
+    ViewData["Title"] = "Confirm email change";
+}
+
+<h1>@ViewData["Title"]</h1>
+<partial name="_StatusMessage" model="Model.StatusMessage" />

IdentityManager/Areas/Identity/Pages/Account/ConfirmEmailChange.cshtml.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Identity;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+using Microsoft.AspNetCore.WebUtilities;
+
+namespace IdentityManager.Areas.Identity.Pages.Account
+{
+    [AllowAnonymous]
+    public class ConfirmEmailChangeModel : PageModel
+    {
+        private readonly UserManager<IdentityUser> _userManager;
+        private readonly SignInManager<IdentityUser> _signInManager;
+
+        public ConfirmEmailChangeModel(UserManager<IdentityUser> userManager, SignInManager<IdentityUser> signInManager)
+        {
+            _userManager = userManager;
+            _signInManager = signInManager;
+        }
+
+        [TempData]
+        public string StatusMessage { get; set; }
+
+        public async Task<IActionResult> OnGetAsync(string userId, string email, string code)
+        {
+            if (userId == null || email == null || code == null)
+            {
+                return RedirectToPage("/Index");
+            }
+
+            var user = await _userManager.FindByIdAsync(userId);
+            if (user == null)
+            {
+                return NotFound($"Unable to load user with ID '{userId}'.");
+            }
+
+            code = Encoding.UTF8.GetString(WebEncoders.Base64UrlDecode(code));
+            var result = await _userManager.ChangeEmailAsync(user, email, code);
+            if (!result.Succeeded)
+            {
+                StatusMessage = "Error changing email.";
+                return Page();
+            }
+
+            // In our UI email and user name are one and the same, so when we update the email
+            // we need to update the user name.
+            var setUserNameResult = await _userManager.SetUserNameAsync(user, email);
+            if (!setUserNameResult.Succeeded)
+            {
+                StatusMessage = "Error changing user name.";
+                return Page();
+            }
+
+            await _signInManager.RefreshSignInAsync(user);
+            StatusMessage = "Thank you for confirming your email change.";
+            return Page();
+        }
+    }
+}

IdentityManager/Areas/Identity/Pages/Account/ExternalLogin.cshtml

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+@page
+@model ExternalLoginModel
+@{
+    ViewData["Title"] = "Register";
+}
+
+<h1>@ViewData["Title"]</h1>
+<h4 id="external-login-title">Associate your @Model.ProviderDisplayName account.</h4>
+<hr />
+
+<p id="external-login-description" class="text-info">
+    You've successfully authenticated with <strong>@Model.ProviderDisplayName</strong>.
+    Please enter an email address for this site below and click the Register button to finish
+    logging in.
+</p>
+
+<div class="row">
+    <div class="col-md-4">
+        <form asp-page-handler="Confirmation" asp-route-returnUrl="@Model.ReturnUrl" method="post">
+            <div asp-validation-summary="ModelOnly" class="text-danger"></div>
+            <div class="form-group">
+                <label asp-for="Input.Email"></label>
+                <input asp-for="Input.Email" class="form-control" />
+                <span asp-validation-for="Input.Email" class="text-danger"></span>
+            </div>
+            <button type="submit" class="btn btn-primary">Register</button>
+        </form>
+    </div>
+</div>
+
+@section Scripts {
+    <partial name="_ValidationScriptsPartial" />
+}

IdentityManager/Areas/Identity/Pages/Account/ExternalLogin.cshtml.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using System.Security.Claims;
+using System.Text;
+using System.Text.Encodings.Web;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Identity;
+using Microsoft.AspNetCore.Identity.UI.Services;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+using Microsoft.AspNetCore.WebUtilities;
+using Microsoft.Extensions.Logging;
+
+namespace IdentityManager.Areas.Identity.Pages.Account
+{
+    [AllowAnonymous]
+    public class ExternalLoginModel : PageModel
+    {
+        private readonly SignInManager<IdentityUser> _signInManager;
+        private readonly UserManager<IdentityUser> _userManager;
+        private readonly IEmailSender _emailSender;
+        private readonly ILogger<ExternalLoginModel> _logger;
+
+        public ExternalLoginModel(
+            SignInManager<IdentityUser> signInManager,
+            UserManager<IdentityUser> userManager,
+            ILogger<ExternalLoginModel> logger,
+            IEmailSender emailSender)
+        {
+            _signInManager = signInManager;
+            _userManager = userManager;
+            _logger = logger;
+            _emailSender = emailSender;
+        }
+
+        [BindProperty]
+        public InputModel Input { get; set; }
+
+        public string ProviderDisplayName { get; set; }
+
+        public string ReturnUrl { get; set; }
+
+        [TempData]
+        public string ErrorMessage { get; set; }
+
+        public class InputModel
+        {
+            [Required]
+            [EmailAddress]
+            public string Email { get; set; }
+        }
+
+        public IActionResult OnGetAsync()
+        {
+            return RedirectToPage("./Login");
+        }
+
+        public IActionResult OnPost(string provider, string returnUrl = null)
+        {
+            // Request a redirect to the external login provider.
+            var redirectUrl = Url.Page("./ExternalLogin", pageHandler: "Callback", values: new { returnUrl });
+            var properties = _signInManager.ConfigureExternalAuthenticationProperties(provider, redirectUrl);
+            return new ChallengeResult(provider, properties);
+        }
+
+        public async Task<IActionResult> OnGetCallbackAsync(string returnUrl = null, string remoteError = null)
+        {
+            returnUrl = returnUrl ?? Url.Content("~/");
+            if (remoteError != null)
+            {
+                ErrorMessage = $"Error from external provider: {remoteError}";
+                return RedirectToPage("./Login", new {ReturnUrl = returnUrl });
+            }
+            var info = await _signInManager.GetExternalLoginInfoAsync();
+            if (info == null)
+            {
+                ErrorMessage = "Error loading external login information.";
+                return RedirectToPage("./Login", new { ReturnUrl = returnUrl });
+            }
+
+            // Sign in the user with this external login provider if the user already has a login.
+            var result = await _signInManager.ExternalLoginSignInAsync(info.LoginProvider, info.ProviderKey, isPersistent: false, bypassTwoFactor : true);
+            if (result.Succeeded)
+            {
+                _logger.LogInformation("{Name} logged in with {LoginProvider} provider.", info.Principal.Identity.Name, info.LoginProvider);
+                return LocalRedirect(returnUrl);
+            }
+            if (result.IsLockedOut)
+            {
+                return RedirectToPage("./Lockout");
+            }
+            else
+            {
+                // If the user does not have an account, then ask the user to create an account.
+                ReturnUrl = returnUrl;
+                ProviderDisplayName = info.ProviderDisplayName;
+                if (info.Principal.HasClaim(c => c.Type == ClaimTypes.Email))
+                {
+                    Input = new InputModel
+                    {
+                        Email = info.Principal.FindFirstValue(ClaimTypes.Email)
+                    };
+                }
+                return Page();
+            }
+        }
+
+        public async Task<IActionResult> OnPostConfirmationAsync(string returnUrl = null)
+        {
+            returnUrl = returnUrl ?? Url.Content("~/");
+            // Get the information about the user from the external login provider
+            var info = await _signInManager.GetExternalLoginInfoAsync();
+            if (info == null)
+            {
+                ErrorMessage = "Error loading external login information during confirmation.";
+                return RedirectToPage("./Login", new { ReturnUrl = returnUrl });
+            }
+
+            if (ModelState.IsValid)
+            {
+                var user = new IdentityUser { UserName = Input.Email, Email = Input.Email };
+
+                var result = await _userManager.CreateAsync(user);
+                if (result.Succeeded)
+                {
+                    result = await _userManager.AddLoginAsync(user, info);
+                    if (result.Succeeded)
+                    {
+                        _logger.LogInformation("User created an account using {Name} provider.", info.LoginProvider);
+
+                        var userId = await _userManager.GetUserIdAsync(user);
+                        var code = await _userManager.GenerateEmailConfirmationTokenAsync(user);
+                        code = WebEncoders.Base64UrlEncode(Encoding.UTF8.GetBytes(code));
+                        var callbackUrl = Url.Page(
+                            "/Account/ConfirmEmail",
+                            pageHandler: null,
+                            values: new { area = "Identity", userId = userId, code = code },
+                            protocol: Request.Scheme);
+
+                        await _emailSender.SendEmailAsync(Input.Email, "Confirm your email",
+                            $"Please confirm your account by <a href='{HtmlEncoder.Default.Encode(callbackUrl)}'>clicking here</a>.");
+
+                        // If account confirmation is required, we need to show the link if we don't have a real email sender
+                        if (_userManager.Options.SignIn.RequireConfirmedAccount)
+                        {
+                            return RedirectToPage("./RegisterConfirmation", new { Email = Input.Email });
+                        }
+
+                        await _signInManager.SignInAsync(user, isPersistent: false, info.LoginProvider);
+
+                        return LocalRedirect(returnUrl);
+                    }
+                }
+                foreach (var error in result.Errors)
+                {
+                    ModelState.AddModelError(string.Empty, error.Description);
+                }
+            }
+
+            ProviderDisplayName = info.ProviderDisplayName;
+            ReturnUrl = returnUrl;
+            return Page();
+        }
+    }
+}