Authenticate a user from a MAUI app against the local Microsoft Identity in the ASP.NET website

Question

I have created a website with ASP.NET Core and NET8. In this web application, I added Microsoft Identity and I added Microsoft and Google as external providers. So, a user can register or login with the local credentials or one of the external providers.

On the website, the authentication is working. Now, I want to extend the registration and the login from the MAUI application.

My idea is to create a few APIs for the authentication and in particular:

• a login endpoint that receives username and password
• a registration endpoint with all the basic details of the user (name, surname, email and password)

Is this a correct approach or best practice?

The other issue I'm thinking about is the authentication with the external providers. How can I manage the authentication from the app for Microsoft and Google and verify that the user exists in the web application?

Answer 1

Hello,

Is this a correct approach or best practice?

For web application authentication, MAUI does not have special circumstances. you can refer to the following document for the guidance on authentication.

Since certification best practices are a huge part of the content, it is recommended that you refer to the following documents for the guidance on certification.

• Security, Authentication, and Authorization in ASP.NET Web API.
• Consume a REST-based web service This document explains how to request a WebAPI in MAUI.

The other issue I'm thinking about is the authentication with the external providers. How can I manage the authentication from the app for Microsoft and Google and verify that the user exists in the web application?

You can link an external account to an account in the program via the Oauth protocol.

Please refer to Microsoft identity platform and OAuth 2.0 authorization code flow for more details.

Best Regards,

Alec Liu.

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