How to build AWS SES Email passwordless sign-in with .NET Core (Blazor WebAssembly) and Logto

July 1, 2024 · 2 min read

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Every app needs authentication and authorization. Logto is an Auth0 alternative designed for modern apps and SaaS products.

In this article, we will go through the steps to quickly build the AWS SES sign-in experience (user authentication) with .NET Core (Blazor WebAssembly) and Logto.

Prerequisites

A running Logto instance. Check out the get started page if you don't have one.
Basic knowledge of .NET Core (Blazor WebAssembly).
A usable AWS SES account.

Create an application in Logto

In you browser, open a new tab and enter the link of Logto Admin Console.

Get Started

Once the page is loaded, in the "Get Started" section click the View all link to open the application framework list page.

Choose your application type

Framework List

In the opening modal, scroll to the "Single page app" section or filter all the available " Single page app" frameworks using the quick filter checkboxes on the left.

Click the ".NET Core (Blazor WebAssembly)" framework card to start creating your application.

Enter application name

Enter the application name, e.g., "Bookstore," and click "Create application."

🎉 Ta-da! You just created your first application in Logto. You'll see a congrats page which includes a detailed integration guide. Follow the guide to see what the experience will be in your application.

Integrate Logto SDK

tip

The following demonstration is built on .NET Core 8.0 and Blorc.OpenIdConnect.
The .NET Core sample projects are available in the GitHub repository.

Installation

Add the NuGet package to your project:

dotnet add package Blorc.OpenIdConnect

Add script references

Include Blorc.Core/injector.js the index.html file:

<head>
  <!-- ... -->
  <script src="_content/Blorc.Core/injector.js"></script>
  <!-- ... -->
</head>

Register services

Add the following code to the Program.cs file:

using Blorc.OpenIdConnect;
using Blorc.Services;

builder.Services.AddBlorcCore();
builder.Services.AddAuthorizationCore();
builder.Services.AddBlorcOpenIdConnect(
    options =>
    {
        builder.Configuration.Bind("IdentityServer", options);
    });

var webAssemblyHost = builder.Build();

await webAssemblyHost
    .ConfigureDocumentAsync(async documentService =>
    {
        await documentService.InjectBlorcCoreJsAsync();
        await documentService.InjectOpenIdConnectAsync();
    });

await webAssemblyHost.RunAsync();

info

There's no need to use the Microsoft.AspNetCore.Components.WebAssembly.Authentication package. The Blorc.OpenIdConnect package will take care of the authentication process.

Configure application

Add the following code to the appsettings.json file:

{
  // ...
  IdentityServer: {
    Authority: 'https://<your-logto-endpoint>/oidc',
    ClientId: '<your-logto-app-id>',
    PostLogoutRedirectUri: '<your-app-url>',
    RedirectUri: '<your-app-url>',
    ResponseType: 'code',
    Scope: 'openid profile', // Add more scopes if needed
  },
}

Remember to add the RedirectUri and PostLogoutRedirectUri to the list of allowed redirect URIs in the Logto application settings. They are both the URL of your WASM application.

Update Razor pages

Add `AuthorizeView` component

In the Razor pages that require authentication, add the AuthorizeView component. Let's assume it's the Home.razor page:

@using Microsoft.AspNetCore.Components.Authorization
@page "/"

<AuthorizeView>
    <Authorized>
        @* Signed in view *@
        <button @onclick="OnLogoutButtonClickAsync">
            Sign out
        </button>
    </Authorized>
    <NotAuthorized>
        @* Unauthenticated view *@
        <button @onclick="OnLoginButtonClickAsync">
            Sign in
        </button>
    </NotAuthorized>
</AuthorizeView>

Set up authentication

In the Home.razor.cs file (create it if it doesn't exist), add the following code:

using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Components;
using Microsoft.AspNetCore.Components.Web;
using Blorc.OpenIdConnect;
using Microsoft.AspNetCore.Components.Authorization;

[Authorize]
public partial class Home : ComponentBase
{
    [Inject]
    public required IUserManager UserManager { get; set; }

    public User<Profile>? User { get; set; }

    [CascadingParameter]
    protected Task<AuthenticationState>? AuthenticationStateTask { get; set; }

    protected override async Task OnInitializedAsync()
    {
        User = await UserManager.GetUserAsync<User<Profile>>(AuthenticationStateTask!);
    }

    private async Task OnLoginButtonClickAsync(MouseEventArgs obj)
    {
        await UserManager.SignInRedirectAsync();
    }

    private async Task OnLogoutButtonClickAsync(MouseEventArgs obj)
    {
        await UserManager.SignOutRedirectAsync();
    }
}

Once the user is authenticated, the User property will be populated with the user information.

Display user information

Here are some examples of how to display user information in the Home.razor page:

<AuthorizeView>
    <Authorized>
        @* Signed in view *@
        @* ... *@
        <p>You are signed in as @(@User?.Profile?.Name ?? "(unknown name)").</p>
    </Authorized>
    @* ... *@
</AuthorizeView>

For more properties and claims, check the User and Profile classes in the Blorc.OpenIdConnect package.

Test your integration

Open your .NET Core (Blazor Server) app to test if the integration works. When you click the "Sign In" button, the page should be redirected to a Logto sign-in page, and you should be able to create a new account by entering username and password and complete the sign-in process.

Add AWS SES connector

To add or change Email connector, go to the "Connector" tab in the Admin Console, then click on "Email and SMS connectors". From there, click "Set up" or go to detail page and click "Change Email connector".

Connector tab

In the openning modal, select "AWS SES" and click "Next".

On the next page, you will see a two-column layout with the README content on the left and configuration on the right.

Feel free to follow the README file in place or read the following section to complete the configuration process. If you follow the in-place guide, you can skip the next section.

Set up AWS SES email connector

Configure a mail service in the AWS service console

Amazon SES is a cloud email service provider that can integrate into any application for bulk email sending.

Logto core calls the Amazon Simple Email Service APIs via this connector, with the help of which Logto end-users can register and sign in to their Logto account via email verification code.

💡 Tip

You can skip some sections if you have already finished.

Register AWS account

Go to AWS and register an account.

Create a identity

Go to Amazon Simple Email Service Console
Create an identity, choose one of the following options
- Create a domain
- Create an email address

Configuration of the connector

Click your username in the upper right corner of the Amazon console to enter Security Credentials. If you don't have one, create an AccessKey and save it carefully.
Complete the settings of the Amazon Simple Email Service connector:
- Use the AccessKey ID and AccessKey Secret obtained in step 1 to fill in accessKeyId and accessKeySecret respectively.
- region: Fill in the region field with the region of the identity you use to send mail.
- emailAddress: The email address you use to send mail, in the format of Logto<[email protected]> or <[email protected]>

the following parameters are optional; parameters description can be found in the AWS SES API documentation.

feedbackForwardingEmailAddress
feedbackForwardingEmailAddressIdentityArn
configurationSetName

Test the Amazon SES connector

You can type in an email address and click on "Send" to see whether the settings work before "Save and Done".

That's it. Don't forget to enable connector in sign-in experience.

Configure types

Name	Type
accessKeyId	string
accessKeySecret	string
region	string
emailAddress	string (OPTIONAL)
emailAddressIdentityArn	string (OPTIONAL)
feedbackForwardingEmailAddress	string (OPTIONAL)
feedbackForwardingEmailAddressIdentityArn	string (OPTIONAL)
configurationSetName	string (OPTIONAL)
templates	Template[]

Template Properties	Type	Enum values
subject	string	N/A
content	string	N/A
usageType	enum string	'Register' \| 'SignIn' \| 'ForgotPassword' \| 'Generic'

Save your configuration

Double check you have filled out necessary values in the Logto connector configuration area. Click "Save and Done" (or "Save changes") and the AWS SES connector should be available now.

Switch to the "Sign-in experience" tab, then click the "Sign-up and sign-in" tab.

note

If it's the first time you enter the tab, you will see a quick introduction about Sign-in Experience and its basic configuration.

Sign-in Experience tab

Select "Email address" or "Email address or phone number" for the "Sign-up identifier" to provide sign-up for Email passwordless sign-in, which may increase your conversion rate.

Save changes

Finally, click "Save changes" on the bottom right corner.

Testing and Validation

Return to your .NET Core (Blazor WebAssembly) app. You should now be able to sign in with AWS SES. Enjoy!

Create an application in Logto​

Choose your application type​

Enter application name​

Integrate Logto SDK​

Installation​

Add script references​

Register services​

Configure application​

Update Razor pages​

Add AuthorizeView component​

Set up authentication​

Display user information​

Add AWS SES connector​

Set up AWS SES email connector​

Configure a mail service in the AWS service console​

Register AWS account​

Create a identity​

Configuration of the connector​

Test the Amazon SES connector​

Configure types​

Save your configuration​

Enable AWS SES connector in Sign-in Experience​

Testing and Validation​

Further readings​