[Zope3-Users] PAU - how to give a principal a role

Darryl Cousins darryl at darrylcousins.net.nz
Tue May 15 20:16:07 EDT 2007


On Tue, 2007-05-15 at 18:02 +0200, Hermann Himmelbauer wrote:
> Hi,
> 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? 

from zope.app.securitypolicy.interfaces import IPrincipalRoleManager
role_manager = IPrincipalRoleManager(ob) 
# ob may the site or any another object
role_manager.assignRoleToPrincipal(therole, principalid)

Like Dominique I also usually assign roles to groups and the users to
the group rather than directly assigning role to the principal. (Groups
are principals).

Hope this helps


> Are principals mapped one to one from users to principals? Or should I perhaps 
> map many users to one principal?
> 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 
> session.
> 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?
> Best Regards,
> Hermann

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