AuthenticationMethod.authenticate(Request request) return Subject
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                 Key: CLEREZZA-481
                 URL: https://issues.apache.org/jira/browse/CLEREZZA-481
             Project: Clerezza
          Issue Type: Improvement
            Reporter: Henry Story


currently AuthenticationMethod.authenticate(Request request)  returns String

  It would make more sense if it could return a Subject [1]. This would allow 
the object returned to be a lot richer. For example

  (a) A Subject can contain a number of credentials and a number of Principals. 
In the WebId with an X509 certificate continaing a number of Subject 
Alternative Names  a subject could contain a number of WebID Principals. Some 
WebIDs might take time to be verified, so they could appear in the Subject at a 
 later time.

  (b) A Subject can also contain credentials. In fact X509 certificates should 
be the prototypical public credential.

  (c) Credentials can be any object, but clearly one could wrap an 
X509certificate in  a class with an isCurrent() method to test if the 
certificate is still valid. It would also allow X509certs to be destroyed, 
which could then perhaps throw TLS exceptions... to be looked into.


1] 
http://download.oracle.com/javase/6/docs/technotes/guides/security/jaas/JAASRefGuide.html#Subject

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