Category Archives: .Net

Token Based Authentication in ASP.Net using JWTs Part 2: Using Refresh Tokens

In Part 1 we setup basic token authentication using JWT’s with asp.net.  Things are setup reasonably but all is not well.  As a developer, you could give the token a lifespan of 30 days and just force the user to re-login after those days but what if you make the user inactive and don’t want him to login anymore?  There must be better way.AJ

Generally, I token has a lifetime of about an hour and when it expires, we want to refresh that token, verifying that the user still has access to the system, etc.  The method that this is handled is using refresh tokens.  A refresh token is returned along with the normal token and it’s stored for when we must refresh normal token.

Starting from our previous app, let’s support refresh tokens.  Note, the completed code for this blog can be found here.

This will require us to track refresh tokens in our database, so first, let’s create the RefreshToken model.

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Simplify Asynchronous Calls in .NET

misc3_bgSince .Net 4.5, the async/await pattern has been a great tool to simplify asynchronous calls.  However, in WPF I frequently need to make async calls from a non-async function or event.  Often, this happens because I’m overriding a virtual function in an inherited class of a framework that I’m using and that function is synchronous.  To help with this, I created an async helper class:

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