#
#  Copyright (c) 2006 Helmut Merz helmutm@cy55.de
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the Free Software
#  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#

"""
Utilities for the loops.organize package.

$Id$
"""

from zope.app import zapi
from zope import interface, component, schema
from zope.app.authentication.interfaces import IPluggableAuthentication
from zope.app.authentication.interfaces import IAuthenticatorPlugin
from zope.app.security.interfaces import IAuthentication

authPluginId = 'loops'


def getPrincipalFolder(context=None):
        pau = zapi.getUtility(IAuthentication, context=context)
        if not IPluggableAuthentication.providedBy(pau):
            raise ValueError(u'There is no pluggable authentication '
                              'utility available.')
        if not authPluginId in pau.authenticatorPlugins:
            raise ValueError(u'There is no loops authenticator '
                              'plugin available.')
        return component.queryUtility(IAuthenticatorPlugin, authPluginId,
                                         context=pau)