Inital project setup
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Vincent Allen
205
OpenArchival.Blazor/Components/Account/Pages/ExternalLogin.razor
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205
OpenArchival.Blazor/Components/Account/Pages/ExternalLogin.razor
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@page "/Account/ExternalLogin"
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@using System.ComponentModel.DataAnnotations
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@using System.Security.Claims
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@using System.Text
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@using System.Text.Encodings.Web
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@using Microsoft.AspNetCore.Identity
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@using Microsoft.AspNetCore.WebUtilities
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@using OpenArchival.Blazor.Data
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@inject SignInManager<ApplicationUser> SignInManager
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@inject UserManager<ApplicationUser> UserManager
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@inject IUserStore<ApplicationUser> UserStore
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@inject IEmailSender<ApplicationUser> EmailSender
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@inject NavigationManager NavigationManager
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@inject IdentityRedirectManager RedirectManager
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@inject ILogger<ExternalLogin> Logger
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<PageTitle>Register</PageTitle>
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<StatusMessage Message="@message" />
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<h1>Register</h1>
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<h2>Associate your @ProviderDisplayName account.</h2>
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<MudDivider />
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<div class="alert alert-info">
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You've successfully authenticated with <strong>@ProviderDisplayName</strong>.
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Please enter an email address for this site below and click the Register button to finish
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logging in.
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</div>
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<div class="row">
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<div class="col-md-4">
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<EditForm Model="Input" OnValidSubmit="OnValidSubmitAsync" FormName="confirmation" method="post">
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<DataAnnotationsValidator />
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<ValidationSummary class="text-danger" role="alert" />
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<div class="form-floating mb-3">
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<InputText @bind-Value="Input.Email" id="Input.Email" class="form-control" autocomplete="email" placeholder="Please enter your email." />
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<label for="Input.Email" class="form-label">Email</label>
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<ValidationMessage For="() => Input.Email" />
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</div>
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<button type="submit" class="w-100 btn btn-lg btn-primary">Register</button>
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</EditForm>
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</div>
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</div>
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@code {
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public const string LoginCallbackAction = "LoginCallback";
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private string? message;
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private ExternalLoginInfo? externalLoginInfo;
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[CascadingParameter]
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private HttpContext HttpContext { get; set; } = default!;
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[SupplyParameterFromForm]
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private InputModel Input { get; set; } = new();
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[SupplyParameterFromQuery]
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private string? RemoteError { get; set; }
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[SupplyParameterFromQuery]
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private string? ReturnUrl { get; set; }
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[SupplyParameterFromQuery]
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private string? Action { get; set; }
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private string? ProviderDisplayName => externalLoginInfo?.ProviderDisplayName;
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protected override async Task OnInitializedAsync()
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{
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if (RemoteError is not null)
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{
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RedirectManager.RedirectToWithStatus("Account/Login", $"Error from external provider: {RemoteError}", HttpContext);
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}
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var info = await SignInManager.GetExternalLoginInfoAsync();
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if (info is null)
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{
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RedirectManager.RedirectToWithStatus("Account/Login", "Error loading external login information.", HttpContext);
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}
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externalLoginInfo = info;
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if (HttpMethods.IsGet(HttpContext.Request.Method))
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{
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if (Action == LoginCallbackAction)
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{
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await OnLoginCallbackAsync();
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return;
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}
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// We should only reach this page via the login callback, so redirect back to
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// the login page if we get here some other way.
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RedirectManager.RedirectTo("Account/Login");
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}
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}
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private async Task OnLoginCallbackAsync()
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{
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if (externalLoginInfo is null)
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{
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RedirectManager.RedirectToWithStatus("Account/Login", "Error loading external login information.", HttpContext);
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}
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// Sign in the user with this external login provider if the user already has a login.
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var result = await SignInManager.ExternalLoginSignInAsync(
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externalLoginInfo!.LoginProvider,
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externalLoginInfo!.ProviderKey,
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isPersistent: false,
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bypassTwoFactor: true);
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if (result.Succeeded)
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{
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Logger.LogInformation(
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"{Name} logged in with {LoginProvider} provider.",
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externalLoginInfo.Principal.Identity?.Name,
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externalLoginInfo.LoginProvider);
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RedirectManager.RedirectTo(ReturnUrl);
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}
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else if (result.IsLockedOut)
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{
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RedirectManager.RedirectTo("Account/Lockout");
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}
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// If the user does not have an account, then ask the user to create an account.
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if (externalLoginInfo.Principal.HasClaim(c => c.Type == ClaimTypes.Email))
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{
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Input.Email = externalLoginInfo.Principal.FindFirstValue(ClaimTypes.Email) ?? "";
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}
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}
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private async Task OnValidSubmitAsync()
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{
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if (externalLoginInfo is null)
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{
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RedirectManager.RedirectToWithStatus("Account/Login", "Error loading external login information during confirmation.", HttpContext);
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}
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var emailStore = GetEmailStore();
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var user = CreateUser();
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await UserStore.SetUserNameAsync(user, Input.Email, CancellationToken.None);
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await emailStore.SetEmailAsync(user, Input.Email, CancellationToken.None);
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var result = await UserManager.CreateAsync(user);
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if (result.Succeeded)
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{
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result = await UserManager.AddLoginAsync(user, externalLoginInfo);
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if (result.Succeeded)
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{
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Logger.LogInformation("User created an account using {Name} provider.", externalLoginInfo.LoginProvider);
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var userId = await UserManager.GetUserIdAsync(user);
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var code = await UserManager.GenerateEmailConfirmationTokenAsync(user);
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code = WebEncoders.Base64UrlEncode(Encoding.UTF8.GetBytes(code));
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var callbackUrl = NavigationManager.GetUriWithQueryParameters(
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NavigationManager.ToAbsoluteUri("Account/ConfirmEmail").AbsoluteUri,
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new Dictionary<string, object?> { ["userId"] = userId, ["code"] = code });
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await EmailSender.SendConfirmationLinkAsync(user, Input.Email, HtmlEncoder.Default.Encode(callbackUrl));
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// If account confirmation is required, we need to show the link if we don't have a real email sender
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if (UserManager.Options.SignIn.RequireConfirmedAccount)
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{
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RedirectManager.RedirectTo("Account/RegisterConfirmation", new() { ["email"] = Input.Email });
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}
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await SignInManager.SignInAsync(user, isPersistent: false, externalLoginInfo.LoginProvider);
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RedirectManager.RedirectTo(ReturnUrl);
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}
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}
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message = $"Error: {string.Join(",", result.Errors.Select(error => error.Description))}";
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}
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private static ApplicationUser CreateUser()
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{
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try
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{
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return Activator.CreateInstance<ApplicationUser>();
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}
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catch
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{
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throw new InvalidOperationException($"Can't create an instance of '{nameof(ApplicationUser)}'. " +
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$"Ensure that '{nameof(ApplicationUser)}' is not an abstract class and has a parameterless constructor");
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}
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}
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private IUserEmailStore<ApplicationUser> GetEmailStore()
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{
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if (!UserManager.SupportsUserEmail)
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{
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throw new NotSupportedException("The default UI requires a user store with email support.");
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}
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return (IUserEmailStore<ApplicationUser>)UserStore;
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}
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private sealed class InputModel
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{
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[Required]
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[EmailAddress]
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public string Email { get; set; } = "";
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}
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}
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