Check if user is logged in with Token Based Authentication in ASP.NET Core

Question

I managed to implement this token based authentication system in my application, but I have a little question. How can I check if a user is signed it (eg if the there is a valid token in the request) within the method? So with the [Authorize] ?

So I have controller, and in that controller I want to check if the user is signed in. I thought of using this:

if (_signInManager.IsSignedIn(ClaimsPrincipal.Current))
{
    ...
}

but it does not work since ClaimsPrincipal.Current is always null

Vi100 · Accepted Answer · 2016-12-24T18:50:47.363

70

You don't need to use the SigninManager or something similar. The user is injected on the pipeline (on the User property of the base controller) and it's info is filled automatically by the authentication middleware (cookie or token). So, on your controller:

bool isAuthenticated = User.Identity.IsAuthenticated;

edited Dec 24 '16 at 18:50

answered Dec 24 '16 at 18:44

Vi100

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I tried your code but it says `The name 'User' does not exist in the current context` – user2657943 Dec 24 '16 at 18:52
1

Does your controller class inherit from "Controller" or is it a POCO? – Vi100 Dec 24 '16 at 18:58
2

Inheriting from Controller fixed that! I can't believe I forgot that! – user2657943 Dec 24 '16 at 19:00

score 4 · Answer 2 · answered Dec 24 '16 at 18:44

4

yes . put [Authorize] attribute above your class or methods to check if user is authenticate or not. You can get user by this code:

var principal = User as ClaimsPrincipal;
var check = User.Identity.IsAuthenticated;

answered Dec 24 '16 at 18:44

Mostafa Esmaeili

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I'd like to try it without [Authorize] first, but it says `The name 'User' does not exist in the current context` – user2657943 Dec 24 '16 at 18:51
You need the following namespace: using System.Security.Principal; – Mostafa Esmaeili Dec 24 '16 at 18:54
I referenced that now but it makes no difference – user2657943 Dec 24 '16 at 18:56
1

or use HttpContext.Current.User – Mostafa Esmaeili Dec 24 '16 at 18:57
HttpContext.Current.User – Mostafa Esmaeili Dec 24 '16 at 18:58

Check if user is logged in with Token Based Authentication in ASP.NET Core

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