Add a ``schema`` command to cmd ctrl to generate schema image.
This changeset add the new commande and do some refactoring in cwconfig and
schema.py to allow the use of CubicWebNoAppConfiguration with
CubicWebSchemaLoader.
"""Security hooks: check permissions to add/delete/update entities according to
the user connected to a session
:organization: Logilab
:copyright: 2001-2010 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
"""
__docformat__ = "restructuredtext en"
from cubicweb import Unauthorized
from cubicweb.server import BEFORE_ADD_RELATIONS, ON_COMMIT_ADD_RELATIONS, hook
def check_entity_attributes(session, entity):
eid = entity.eid
eschema = entity.e_schema
# ._default_set is only there on entity creation to indicate unspecified
# attributes which has been set to a default value defined in the schema
defaults = getattr(entity, '_default_set', ())
try:
editedattrs = entity.edited_attributes
except AttributeError:
editedattrs = entity
for attr in editedattrs:
if attr in defaults:
continue
rdef = eschema.rdef(attr)
if rdef.final: # non final relation are checked by other hooks
# add/delete should be equivalent (XXX: unify them into 'update' ?)
rdef.check_perm(session, 'add', eid=eid)
class _CheckEntityPermissionOp(hook.LateOperation):
def precommit_event(self):
#print 'CheckEntityPermissionOp', self.session.user, self.entity, self.action
self.entity.check_perm(self.action)
check_entity_attributes(self.session, self.entity)
def commit_event(self):
pass
class _CheckRelationPermissionOp(hook.LateOperation):
def precommit_event(self):
rdef = self.rschema.rdef(self.session.describe(self.eidfrom)[0],
self.session.describe(self.eidto)[0])
rdef.check_perm(self.session, self.action,
fromeid=self.eidfrom, toeid=self.eidto)
def commit_event(self):
pass
class SecurityHook(hook.Hook):
__abstract__ = True
category = 'security'
__select__ = hook.Hook.__select__ & hook.regular_session()
class AfterAddEntitySecurityHook(SecurityHook):
__regid__ = 'securityafteraddentity'
events = ('after_add_entity',)
def __call__(self):
_CheckEntityPermissionOp(self._cw, entity=self.entity, action='add')
class AfterUpdateEntitySecurityHook(SecurityHook):
__regid__ = 'securityafterupdateentity'
events = ('after_update_entity',)
def __call__(self):
try:
# check user has permission right now, if not retry at commit time
self.entity.check_perm('update')
check_entity_attributes(self._cw, self.entity)
except Unauthorized:
self.entity.clear_local_perm_cache('update')
_CheckEntityPermissionOp(self._cw, entity=self.entity, action='update')
class BeforeDelEntitySecurityHook(SecurityHook):
__regid__ = 'securitybeforedelentity'
events = ('before_delete_entity',)
def __call__(self):
self.entity.check_perm('delete')
class BeforeAddRelationSecurityHook(SecurityHook):
__regid__ = 'securitybeforeaddrelation'
events = ('before_add_relation',)
def __call__(self):
if self.rtype in BEFORE_ADD_RELATIONS:
nocheck = self._cw.transaction_data.get('skip-security', ())
if (self.eidfrom, self.rtype, self.eidto) in nocheck:
return
rschema = self._cw.repo.schema[self.rtype]
rdef = rschema.rdef(self._cw.describe(self.eidfrom)[0],
self._cw.describe(self.eidto)[0])
rdef.check_perm(self._cw, 'add', fromeid=self.eidfrom, toeid=self.eidto)
class AfterAddRelationSecurityHook(SecurityHook):
__regid__ = 'securityafteraddrelation'
events = ('after_add_relation',)
def __call__(self):
if not self.rtype in BEFORE_ADD_RELATIONS:
nocheck = self._cw.transaction_data.get('skip-security', ())
if (self.eidfrom, self.rtype, self.eidto) in nocheck:
return
rschema = self._cw.repo.schema[self.rtype]
if self.rtype in ON_COMMIT_ADD_RELATIONS:
_CheckRelationPermissionOp(self._cw, action='add',
rschema=rschema,
eidfrom=self.eidfrom,
eidto=self.eidto)
else:
rdef = rschema.rdef(self._cw.describe(self.eidfrom)[0],
self._cw.describe(self.eidto)[0])
rdef.check_perm(self._cw, 'add', fromeid=self.eidfrom, toeid=self.eidto)
class BeforeDeleteRelationSecurityHook(SecurityHook):
__regid__ = 'securitybeforedelrelation'
events = ('before_delete_relation',)
def __call__(self):
nocheck = self._cw.transaction_data.get('skip-security', ())
if (self.eidfrom, self.rtype, self.eidto) in nocheck:
return
rschema = self._cw.repo.schema[self.rtype]
rdef = rschema.rdef(self._cw.describe(self.eidfrom)[0],
self._cw.describe(self.eidto)[0])
rdef.check_perm(self._cw, 'delete', fromeid=self.eidfrom, toeid=self.eidto)