Unable to create custom SignInManager in class library

[saluce65]

I'm trying to create a custom SignInManager in a class library, where I'm overriding the CheckPasswordSignInAsync method to use LDAP password check rather than using the database (however, otherwise user information and claims are stored in the database by default).

In .NET Core 2.2, this was a trivial task: all I needed to do was add Microsoft.AspNetCore.Identity 2.2.0 to the library and derive from SignInManager.

Unfortunately, it looks like the SignInManager class has been moved to Microsoft.AspNetCore.App.Ref library. Because it is classified as a DotNetPlatform package type, I cannot bring it into a netstandard2.0 or netcoreapp3.0 class library. The only way to get the SignInManager to show up correctly is by changing the .csproj file to target Sdk="Microsoft.NET.Sdk.Web". Except, now I'm no longer creating a class library, I'm creating a new .NET Core 3.0 project, which is not what I want (nor will it compile without having a Startup.cs file).

SignInManager and UserManager should be accessible in a class library so that they can be inherited from for use in multiple projects.

[blowdart]

@DamianEdwards another side effect of 3.0.

@HaoK is it feasible to move identity targetting?

[HaoK]

not really, sign in manager is heavily coupled to the Http Authentication stack (its basically some sugar on top of a series of cookies)

[saluce65]

I've just submitted a feature request (#11043) for a change that I think will make what I'm trying to do easier, without having to create a custom SignInManager. It looks like the UserManager is actually available in Microsoft.Extensions.Identity.Core version 3.0.0-preview-18579-0056, but there's no preview5 version of the package.

[blowdart]

Closing as discussion will move to #11043