I’ve blogged about user impersonation in Asp.Net MVC three years ago and this article has been in top 10 of most visited pages in my blog.
Since Asp.Net Core is out and more or less ready for production, it is time to review the article and give guidance how to do the same thing in Core. Approach have not changed at all, we do same steps as before, only some API been changed and it took me a bit of time to figure out all the updated API parts.
Impersonation is when an admin user is logged in with the same privileges as a user, but without knowing their password or other credentials. I’ve used this in couple applications and it was invaluable for support cases and debugging user permissions.
The process of impersonation in Asp.Net core is pretty simple – we create cookie for potential user and give this to the current admin user. Also we need to add some information to the cookie that impersonation is happening and give admin a way to go back to their own account without having to log-in again.