Hi,

I will try to describe the exact problem in detail as it is hard to sum up 
in the title.

We have a website and several other services that we are gonna protect with 
CAS 5.3. The website uses Spring Security but we have to use a custom 
access control due to it's Vaadin nature. It's a SPA so we cannot rely on 
Spring Security's filter mechanism.

I would like to be able to login a user that is already authenticated via 
CAS when the user enters the website. Normally, the Spring Security 
CasAuthenticationFilter would jump in if a user wants to visit a guarded 
page but this is not the case. I understand I have to trigger that 
mechanism manually.

Does anyone has a suggestion what would be the best approach? Use the Java 
CAS Client and do more or less the same what the CasAuthenticationFilter is 
doing and implement it on my own?

Cheers,
  Paul

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