[Zope3-Users] PAU - how to give a principal a role
dominique.lederer at inode.at
Tue May 15 14:36:54 EDT 2007
Hermann Himmelbauer wrote:
> I have to write an Authenticator Plugin for my application. My login/pass data
> is stored in a relational database, which I access via zsqlalchemy.
> I have several objects, which are secured by certain permissions. Moreover I
> granted permissions to several roles, which I also defined.
> My problem is how to give users, which are stored in my database, the correct
> role (and therefore permission). If I understand it right, an Authenticator
> Plugin returns a principal, which represents a user in the database, but how
> can I map the principal to a specific role?
> Are principals mapped one to one from users to principals? Or should I perhaps
> map many users to one principal?
i mapped the specific roles to a user group (principal), which is then assigned
> What I further don't understand is if and why authenticator plugins are called
> when credentials are correctly retrieved via e.g. the
> SessionCredentialsPlugin or how I can prevent it:
> When the user logs in, there are no credentials and he has to supply them via
> the login form. Then he is authenticated by the AuthenticatorPlugin (e.g. the
> database is queried for user/pass), and the credentials are stored in the
> However, for subsequent requests, I think it makes no sense to query the
> database again, as the user has already authenticated - or am I getting
> something wrong?
i save the time, when the authenticator authenticated its credentianls in the
database in a session, then i set a lease time, where the database is not looked
up. in this period, the user principalinfo is retrieved from the session.
so i prevent the db lookup on every request.
> Best Regards,
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