I am trying to create an app on the top of ASP.NET 6/Core framework using C#. I want to allow users to login either using basic-authentication "app managed username and password" or LDAP authentication.
Use Cases
Scenario #1 a user that belongs to active directory would provide their username and password. LdapAuthenticationHandler would check the provided credentials against an LDAP server.
Scenario #2 a user that does NOT belong to active directory would provide their username and password. BasicAuthenticationHandler would check the provided credentials against the username and password stored in the app's database.
Findings
ASP.NET Identity allow me to register different types of authentication providers as explained here. Also, it explains how to select the authentication provider using the [Authorize] attribute.
Questions
When a user logins using the login form, how can I determine which authentication provider I should use to validate the user?