How to check if a user is in a role in Asp.Net Core Identity Framework

Question

I've an app that will have multiples level of organization, and for each level, there will be rights(admin-reader-...).

I want to create(and maintain) a list of roles for each user, but it means that a lot of those roles name will be dynamic, like {id-of-the-organization]-admin .

Therefore, I cannot just do the usual Authorize :

[Authorize(Roles = "Administrator, PowerUser")]
public class ControlAllPanelController : Controller
{
    public IActionResult SetTime() =>
        Content("Administrator || PowerUser");

    [Authorize(Roles = "Administrator")]
    public IActionResult ShutDown() =>
        Content("Administrator only");
}

I would like to have something like

public class ControlAllPanelController : Controller
{
    [Authorize]
    public IActionResult SetTime(Guid organizationId) {
        someService.Authorize(organizationId+"-SetTime");//Throw exception or return boolean
        //... rest of my logic
    }
}

Not sure how to achieve this? I've seen example of this with the IAuthorize service, but this was requiring to provide policies name, which I don't have for this case(Or maybe there is one by default but I don't know its name. `

I've seen that the ClaimsPrincipal has a IsInRole , but I'm not totally sure it get the latest information from Asp.Net Core Identity Framwork(from the user manager) (only what is stored inside the token?)?

Answer 1

You can use HttpContext to look at the claims in the JWT.

I have recently been working with authorizations in .NET API and this is what I done:

var identity = this.HttpContext.User.Identities.FirstOrDefault();
var role = identity.Claims.FirstOrDefault(x => x.Type == "role").Value;
                    
if (role != "Admin")
{
    return Unauthorized("You don't have to correct permissons to do this.");
}

So I'm getting the Identity details, then searching the claims for the role claim.

As a side note, Im using this in a controller inheriting from ControllerBase so I believe HttpContext is a property of this class so no need to inject it if you're using this. Else, you'd probably have to use it via DI, but should all work the same.