260 lines
8.3 KiB
Python
260 lines
8.3 KiB
Python
from __future__ import absolute_import
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import logging
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from django.db import models
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from django.utils.translation import ugettext_lazy as _
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from django.utils.translation import ugettext
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from django.contrib.contenttypes.models import ContentType
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from django.contrib.contenttypes import generic
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from django.contrib.auth.models import User
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from django.core.exceptions import PermissionDenied
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from common.models import AnonymousUserSingleton
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from .managers import (RoleMemberManager, StoredPermissionManager)
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logger = logging.getLogger(__name__)
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class PermissionNamespace(object):
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def __init__(self, name, label):
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self.name = name
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self.label = label
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def __unicode__(self):
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return unicode(self.label)
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class PermissionDoesNotExists(Exception):
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pass
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class PermissionManager(object):
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_permissions = {}
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DoesNotExist = PermissionDoesNotExists()
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@classmethod
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def register(cls, namespace, name, label):
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permission = Permission(namespace, name, label)
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cls._permissions[permission.uuid] = permission
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return permission
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@classmethod
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def check_permissions(cls, requester, permission_list):
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for permission in permission_list:
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if permission.requester_has_this(requester):
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return True
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logger.debug('no permission')
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raise PermissionDenied(ugettext(u'Insufficient permissions.'))
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@classmethod
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def get_for_holder(cls, holder):
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return StoredPermission.objects.get_for_holder(holder)
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@classmethod
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def all(cls):
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# Return sorted permisions by namespace.name
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return sorted(cls._permissions.values(), key=lambda x: x.namespace.name)
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@classmethod
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def get(cls, get_dict, proxy_only=False):
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if 'pk' in get_dict:
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try:
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if proxy_only:
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return cls._permissions[get_dict['pk']]
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else:
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return cls._permissions[get_dict['pk']].get_stored_permission()
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except KeyError:
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raise Permission.DoesNotExist
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def __init__(self, model):
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self.model = model
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class Permission(object):
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DoesNotExist = PermissionDoesNotExists
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def __init__(self, namespace, name, label):
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self.namespace = namespace
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self.name = name
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self.label = label
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self.pk = self.uuid
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def __unicode__(self):
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return unicode(self.label)
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def __str__(self):
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return str(self.__unicode__())
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@property
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def uuid(self):
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return u'%s.%s' % (self.namespace.name, self.name)
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@property
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def stored_permission(self):
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return self.get_stored_permission()
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def get_stored_permission(self):
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stored_permission, created = StoredPermission.objects.get_or_create(
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namespace=self.namespace.name,
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name=self.name,
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)
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stored_permission.label = self.label
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stored_permission.save()
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stored_permission.volatile_permission = self
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return stored_permission
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def requester_has_this(self, requester):
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stored_permission = self.get_stored_permission()
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return stored_permission.requester_has_this(requester)
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def save(self, *args, **kwargs):
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return self.get_stored_permission()
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Permission.objects = PermissionManager(Permission)
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Permission._default_manager = Permission.objects
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class StoredPermission(models.Model):
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namespace = models.CharField(max_length=64, verbose_name=_(u'namespace'))
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name = models.CharField(max_length=64, verbose_name=_(u'name'))
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objects = StoredPermissionManager()
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class Meta:
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ordering = ('namespace', )
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unique_together = ('namespace', 'name')
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verbose_name = _(u'permission')
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verbose_name_plural = _(u'permissions')
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def __init__(self, *args, **kwargs):
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super(StoredPermission, self).__init__(*args, **kwargs)
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self.volatile_permission = Permission.objects.get({'pk': '%s.%s' % (self.namespace, self.name)}, proxy_only=True)
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def __unicode__(self):
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return unicode(getattr(self, 'volatile_permission', self.name))
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def get_holders(self):
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return [holder.holder_object for holder in self.permissionholder_set.all()]
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def requester_has_this(self, actor):
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actor = AnonymousUserSingleton.objects.passthru_check(actor)
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logger.debug('actor: %s' % actor)
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if isinstance(actor, User):
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if actor.is_superuser or actor.is_staff:
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return True
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# Request is one of the permission's holders?
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if actor in self.get_holders():
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return True
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# If not check if the requesters memberships objects is one of
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# the permission's holder?
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roles = RoleMember.objects.get_roles_for_member(actor)
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if isinstance(actor, User):
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groups = actor.groups.all()
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else:
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groups = []
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for membership in list(set(roles) | set(groups)):
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if self.requester_has_this(membership):
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return True
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logger.debug('Fallthru')
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return False
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def grant_to(self, actor):
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actor = AnonymousUserSingleton.objects.passthru_check(actor)
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permission_holder, created = PermissionHolder.objects.get_or_create(permission=self, holder_type=ContentType.objects.get_for_model(actor), holder_id=actor.pk)
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return created
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def revoke_from(self, actor):
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actor = AnonymousUserSingleton.objects.passthru_check(actor)
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try:
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permission_holder = PermissionHolder.objects.get(permission=self, holder_type=ContentType.objects.get_for_model(actor), holder_id=actor.pk)
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permission_holder.delete()
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return True
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except PermissionHolder.DoesNotExist:
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return False
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class PermissionHolder(models.Model):
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permission = models.ForeignKey(StoredPermission, verbose_name=_(u'permission'))
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holder_type = models.ForeignKey(ContentType,
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related_name='permission_holder',
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limit_choices_to={'model__in': ('user', 'group', 'role')})
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holder_id = models.PositiveIntegerField()
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holder_object = generic.GenericForeignKey(ct_field='holder_type', fk_field='holder_id')
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class Meta:
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verbose_name = _(u'permission holder')
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verbose_name_plural = _(u'permission holders')
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def __unicode__(self):
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return u'%s: %s' % (self.holder_type, self.holder_object)
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class Role(models.Model):
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name = models.CharField(max_length=64, unique=True)
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label = models.CharField(max_length=64, unique=True, verbose_name=_(u'label'))
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class Meta:
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ordering = ('label',)
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verbose_name = _(u'role')
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verbose_name_plural = _(u'roles')
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def __unicode__(self):
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return self.label
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@models.permalink
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def get_absolute_url(self):
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return ('role_list',)
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def add_member(self, member):
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member = AnonymousUserSingleton.objects.passthru_check(member)
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role_member, created = RoleMember.objects.get_or_create(
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role=self,
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member_type=ContentType.objects.get_for_model(member),
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member_id=member.pk)
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if not created:
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raise Exception('Unable to add member to role')
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def remove_member(self, member):
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member = AnonymousUserSingleton.objects.passthru_check(member)
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member_type=ContentType.objects.get_for_model(member)
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role_member = RoleMember.objects.get(role=self, member_type=member_type, member_id=member.pk)
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role_member.delete()
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def members(self, filter_dict=None):
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filter_dict = filter_dict or {}
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return [member.member_object for member in self.rolemember_set.filter(**filter_dict) if member is None]
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class RoleMember(models.Model):
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role = models.ForeignKey(Role, verbose_name=_(u'role'))
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member_type = models.ForeignKey(ContentType,
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related_name='role_member',
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limit_choices_to={
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'model__in': (
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'user', 'group', 'anonymoususersingleton'
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)
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}
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)
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member_id = models.PositiveIntegerField()
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member_object = generic.GenericForeignKey(ct_field='member_type', fk_field='member_id')
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objects = RoleMemberManager()
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class Meta:
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#ordering = ('label',)
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verbose_name = _(u'role member')
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verbose_name_plural = _(u'role members')
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def __unicode__(self):
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return unicode(self.member_object)
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