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Introduction

These days, most web and native applications offer registration using a third-party service. The most common are Gmail, Microsoft, Facebook and Twitter. Enabling users to sign in with their existing credentials is convenient and shifts many of the complexities of managing the sign-in process onto a third party provider.

Requirements

You can use one of the previous Auth projects apps for this project.
Users should be able to register/login into your website using Facebook, Gmail, Github, Windows and Twitter. All five are necessary for the project to be approved.
User should also be able to register using the existing registration form.
Existing users should be able to link their account to one of the services above.

Resources

External provider authentication in ASP.NET Core

Tips

Initially, wire up external auth to a brand new app. Once the integration with external services is understood in isolation, it might be easier to apply it to an existing project.

Challenges

You can add many other services as options for the user. Check this list.
You can use aditional claims from the external provider. Check this article.

Review Repository