Aaru.Server/Aaru.Server/Components/Account/Pages/ResendEmailConfirmation.razor

@page "/Account/ResendEmailConfirmation"
@using System.ComponentModel.DataAnnotations
@using System.Text
@using System.Text.Encodings.Web
@using Microsoft.AspNetCore.Identity
@using Microsoft.AspNetCore.WebUtilities

@inject UserManager<IdentityUser>  UserManager
@inject IEmailSender<IdentityUser> EmailSender
@inject NavigationManager          NavigationManager
@inject IdentityRedirectManager    RedirectManager

<PageTitle>Resend email confirmation</PageTitle>

<h1>Resend email confirmation</h1>
<h2>Enter your email.</h2>
<hr/>
<StatusMessage Message="@message"/>
<div class="row">
    <div class="col-md-4">
        <EditForm FormName="resend-email-confirmation" method="post" Model="Input" OnValidSubmit="OnValidSubmitAsync">
            <DataAnnotationsValidator/>
            <ValidationSummary class="text-danger" role="alert"/>
            <div class="form-floating mb-3">
                <InputText aria-required="true" @bind-Value="Input.Email" class="form-control" placeholder="name@example.com"/>
                <label class="form-label" for="email">Email</label>
                <ValidationMessage class="text-danger" For="() => Input.Email"/>
            </div>
            <button class="btn btn-lg btn-primary w-100" type="submit">Resend</button>
        </EditForm>
    </div>
</div>

@code {
    private string? message;

    [SupplyParameterFromForm]
    private InputModel Input { get; set; } = new();

    private async Task OnValidSubmitAsync()
    {
        IdentityUser? user = await UserManager.FindByEmailAsync(Input.Email!);

        if(user is null)
        {
            message = "Verification email sent. Please check your email.";

            return;
        }

        string userId = await UserManager.GetUserIdAsync(user);
        string code   = await UserManager.GenerateEmailConfirmationTokenAsync(user);
        code = WebEncoders.Base64UrlEncode(Encoding.UTF8.GetBytes(code));

        string callbackUrl = NavigationManager.GetUriWithQueryParameters(NavigationManager.ToAbsoluteUri("Account/ConfirmEmail").AbsoluteUri,
                                                                         new Dictionary<string, object?>
                                                                         {
                                                                             ["userId"] = userId,
                                                                             ["code"]   = code
                                                                         });

        await EmailSender.SendConfirmationLinkAsync(user, Input.Email, HtmlEncoder.Default.Encode(callbackUrl));

        message = "Verification email sent. Please check your email.";
    }

    private sealed class InputModel
    {
        [Required]
        [EmailAddress]
        public string Email { get; set; } = "";
    }

}