Setup Account confirmation and password recovery in ASP.NET Core

Setup SendGrid Account

• Setup account at https://sendgrid.com/
• Get API key.
• NuGet and install SendGrid to app.

Blazor WebAssembly Setup

Note:

• Add to “Server” project, not “Client” project.
• Need to setup user secrete for the application first.

Add “SendGridUser” and “SendGridKey” user secrete to Server project.

PM> dotnet user-secrets init --project "C:\MyApp\Server"

PM> dotnet user-secrets set SendGridUser test@test.com --project "C:\MyApp\Server"

PM> dotnet user-secrets set SendGridKey xxxxxxxxxxxxxxxxxxxxx --project "C:\MyApp\Server"

secrets.json

{
  "SendGridUser": "test@test.com",
  "SendGridKey": "xxxxxxxxxxxxxxxxxxxxx"
}

Add classes to Services folder

using Microsoft.AspNetCore.Identity.UI.Services;
using Microsoft.Extensions.Options;
using SendGrid;
using SendGrid.Helpers.Mail;

AuthMessageSenderOptions.cs

    public class AuthMessageSenderOptions
    {
        public string SendGridUser { get; set; }
        public string SendGridKey { get; set; }
    }

EmailSender.cs

    public class EmailSender : IEmailSender
    {
        public EmailSender(IOptions<AuthMessageSenderOptions> optionsAccessor)
        {
            Options = optionsAccessor.Value;
        }

        public AuthMessageSenderOptions Options { get; } //set only via Secret Manager

        public Task SendEmailAsync(string email, string subject, string message)
        {
            return Execute(Options.SendGridKey, subject, message, email);
        }

        public Task Execute(string apiKey, string subject, string message, string email)
        {
            var client = new SendGridClient(apiKey);
            var msg = new SendGridMessage()
            {
                From = new EmailAddress("test@test.com", Options.SendGridUser),
                Subject = subject,
                PlainTextContent = message,
                HtmlContent = message
            };
            msg.AddTo(new EmailAddress(email));

            // Disable click tracking.
            // See https://sendgrid.com/docs/User_Guide/Settings/tracking.html
            msg.SetClickTracking(false, false);

            return client.SendEmailAsync(msg);
        }

Areas.Identity.Pages.Account.RegisterConfirmation page

DisplayConfirmAccountLink = false;

Startup.cs

using Microsoft.AspNetCore.Identity.UI.Services;
using MyApp.Server.Services;

        public void ConfigureServices(IServiceCollection services)
        {

            // requires
            // using Microsoft.AspNetCore.Identity.UI.Services;
            // using CustomersdbPOS.Server.Services;
            services.AddTransient<IEmailSender, EmailSender>();
            services.Configure<AuthMessageSenderOptions>(Configuration);

        }

Sources:

https://docs.microsoft.com/en-us/aspnet/core/security/authentication/accconfirm?view=aspnetcore-5.0&tabs=visual-studio