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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright (C) 2010-2013 Étienne Loks <etienne.loks_AT_peacefrogsDOTnet>
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# See the file COPYING for details.
"""
Permission backend to manage "own" objects
"""
from django.contrib.auth.backends import ModelBackend
from django.core.exceptions import ObjectDoesNotExist
from django.db.models.loading import cache
import models
class ObjectPermBackend(ModelBackend):
supports_object_permissions = True
supports_anonymous_user = True
def has_perm(self, user_obj, perm, model=None, obj=None, session=None):
if not user_obj.is_authenticated():
return False
if not model:
# let it manage by the default backend
return False
try:
ishtar_user = models.IshtarUser.objects.get(user_ptr=user_obj)
except ObjectDoesNotExist:
return False
try:
is_ownperm = perm.split('.')[-1].split('_')[1] == 'own'
except IndexError:
is_ownperm = False
if ishtar_user.has_right('administrator', session=session):
return True
main_right = ishtar_user.person.has_right(perm, session=session) \
or user_obj.has_perm(perm)
if not main_right or not is_ownperm:
return main_right
if obj is None:
model_name = perm.split('_')[-1].capitalize()
model = None
for app in cache.get_apps():
for modl in cache.get_models(app):
if modl.__name__ == model_name:
model = modl
if not model:
return False
return not is_ownperm or model.has_item_of(ishtar_user)
return not is_ownperm or obj.is_own(user_obj)
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