hooks/syncsession.py
author Pierre-Yves David <pierre-yves.david@logilab.fr>
Fri, 22 Mar 2013 19:58:43 +0100
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child 9469 032825bbacab
permissions -rw-r--r--
[session] document Session._tx
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# copyright 2003-2012 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
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#
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# This file is part of CubicWeb.
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#
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# CubicWeb is free software: you can redistribute it and/or modify it under the
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# terms of the GNU Lesser General Public License as published by the Free
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# Software Foundation, either version 2.1 of the License, or (at your option)
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# any later version.
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#
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# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License along
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# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
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"""Core hooks: synchronize living session on persistent data changes"""
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__docformat__ = "restructuredtext en"
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_ = unicode
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from cubicweb import UnknownProperty, BadConnectionId, validation_error
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from cubicweb.predicates import is_instance
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from cubicweb.server import hook
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def get_user_sessions(repo, ueid):
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    for session in repo._sessions.itervalues():
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        if ueid == session.user.eid:
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            yield session
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class SyncSessionHook(hook.Hook):
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    __abstract__ = True
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    category = 'syncsession'
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# user/groups synchronisation #################################################
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class _GroupOperation(hook.Operation):
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    """base class for group operation"""
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    cnxuser = None # make pylint happy
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    def __init__(self, session, *args, **kwargs):
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        """override to get the group name before actual groups manipulation:
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        we may temporarily loose right access during a commit event, so
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        no query should be emitted while comitting
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        """
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        rql = 'Any N WHERE G eid %(x)s, G name N'
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        result = session.execute(rql, {'x': kwargs['geid']}, build_descr=False)
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        hook.Operation.__init__(self, session, *args, **kwargs)
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        self.group = result[0][0]
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class _DeleteGroupOp(_GroupOperation):
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    """synchronize user when a in_group relation has been deleted"""
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    def postcommit_event(self):
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        """the observed connections set has been commited"""
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        groups = self.cnxuser.groups
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        try:
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            groups.remove(self.group)
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        except KeyError:
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            self.error('user %s not in group %s',  self.cnxuser, self.group)
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class _AddGroupOp(_GroupOperation):
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    """synchronize user when a in_group relation has been added"""
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    def postcommit_event(self):
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        """the observed connections set has been commited"""
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        groups = self.cnxuser.groups
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        if self.group in groups:
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            self.warning('user %s already in group %s', self.cnxuser,
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                         self.group)
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        else:
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            groups.add(self.group)
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class SyncInGroupHook(SyncSessionHook):
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    __regid__ = 'syncingroup'
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    __select__ = SyncSessionHook.__select__ & hook.match_rtype('in_group')
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    events = ('after_delete_relation', 'after_add_relation')
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    def __call__(self):
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        if self.event == 'after_delete_relation':
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            opcls = _DeleteGroupOp
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        else:
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            opcls = _AddGroupOp
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        for session in get_user_sessions(self._cw.repo, self.eidfrom):
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            opcls(self._cw, cnxuser=session.user, geid=self.eidto)
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class _DelUserOp(hook.Operation):
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    """close associated user's session when it is deleted"""
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    def __init__(self, session, cnxid):
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        self.cnxid = cnxid
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        hook.Operation.__init__(self, session)
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    def postcommit_event(self):
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        """the observed connections set has been commited"""
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        try:
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            self.session.repo.close(self.cnxid)
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        except BadConnectionId:
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            pass # already closed
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class CloseDeletedUserSessionsHook(SyncSessionHook):
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    __regid__ = 'closession'
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    __select__ = SyncSessionHook.__select__ & is_instance('CWUser')
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    events = ('after_delete_entity',)
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    def __call__(self):
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        """modify user permission, need to update users"""
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        for session in get_user_sessions(self._cw.repo, self.entity.eid):
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            _DelUserOp(self._cw, session.id)
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# CWProperty hooks #############################################################
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class _DelCWPropertyOp(hook.Operation):
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    """a user's custom properties has been deleted"""
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    cwpropdict = key = None # make pylint happy
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    def postcommit_event(self):
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        """the observed connections set has been commited"""
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        try:
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            del self.cwpropdict[self.key]
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        except KeyError:
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            self.error('%s has no associated value', self.key)
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class _ChangeCWPropertyOp(hook.Operation):
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    """a user's custom properties has been added/changed"""
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    cwpropdict = key = value = None # make pylint happy
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    def postcommit_event(self):
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        """the observed connections set has been commited"""
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        self.cwpropdict[self.key] = self.value
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class _AddCWPropertyOp(hook.Operation):
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    """a user's custom properties has been added/changed"""
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    cwprop = None # make pylint happy
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    def postcommit_event(self):
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        """the observed connections set has been commited"""
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        cwprop = self.cwprop
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        if not cwprop.for_user:
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            self.session.vreg['propertyvalues'][cwprop.pkey] = cwprop.value
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        # if for_user is set, update is handled by a ChangeCWPropertyOp operation
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class AddCWPropertyHook(SyncSessionHook):
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    __regid__ = 'addcwprop'
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    __select__ = SyncSessionHook.__select__ & is_instance('CWProperty')
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    events = ('after_add_entity',)
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    def __call__(self):
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        key, value = self.entity.pkey, self.entity.value
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        if key.startswith('sources.'):
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            return
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        session = self._cw
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        try:
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            value = session.vreg.typed_value(key, value)
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        except UnknownProperty:
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            msg = _('unknown property key %s')
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            raise validation_error(self.entity, {('pkey', 'subject'): msg}, (key,))
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        except ValueError as ex:
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            raise validation_error(self.entity,
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                                  {('value', 'subject'): str(ex)})
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        if not session.user.matching_groups('managers'):
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            session.add_relation(self.entity.eid, 'for_user', session.user.eid)
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        else:
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            _AddCWPropertyOp(session, cwprop=self.entity)
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class UpdateCWPropertyHook(AddCWPropertyHook):
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    __regid__ = 'updatecwprop'
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    events = ('after_update_entity',)
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    def __call__(self):
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        entity = self.entity
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        if not ('pkey' in entity.cw_edited or
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                'value' in entity.cw_edited):
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            return
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        key, value = entity.pkey, entity.value
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        if key.startswith('sources.'):
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            return
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        session = self._cw
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        try:
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            value = session.vreg.typed_value(key, value)
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        except UnknownProperty:
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            return
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        except ValueError as ex:
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            raise validation_error(entity, {('value', 'subject'): str(ex)})
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        if entity.for_user:
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            for session_ in get_user_sessions(session.repo, entity.for_user[0].eid):
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                _ChangeCWPropertyOp(session, cwpropdict=session_.user.properties,
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                                    key=key, value=value)
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        else:
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            # site wide properties
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            _ChangeCWPropertyOp(session, cwpropdict=session.vreg['propertyvalues'],
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                              key=key, value=value)
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class DeleteCWPropertyHook(AddCWPropertyHook):
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    __regid__ = 'delcwprop'
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    events = ('before_delete_entity',)
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    def __call__(self):
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        eid = self.entity.eid
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        session = self._cw
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        for eidfrom, rtype, eidto in session.transaction_data.get('pendingrelations', ()):
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            if rtype == 'for_user' and eidfrom == self.entity.eid:
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                # if for_user was set, delete has already been handled
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                break
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        else:
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            _DelCWPropertyOp(session, cwpropdict=session.vreg['propertyvalues'],
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                             key=self.entity.pkey)
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class AddForUserRelationHook(SyncSessionHook):
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    __regid__ = 'addcwpropforuser'
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    __select__ = SyncSessionHook.__select__ & hook.match_rtype('for_user')
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    events = ('after_add_relation',)
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    def __call__(self):
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        session = self._cw
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        eidfrom = self.eidfrom
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        if not session.describe(eidfrom)[0] == 'CWProperty':
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            return
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        key, value = session.execute('Any K,V WHERE P eid %(x)s,P pkey K,P value V',
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                                     {'x': eidfrom})[0]
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        if session.vreg.property_info(key)['sitewide']:
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            msg = _("site-wide property can't be set for user")
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            raise validation_error(eidfrom, {('for_user', 'subject'): msg})
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        for session_ in get_user_sessions(session.repo, self.eidto):
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            _ChangeCWPropertyOp(session, cwpropdict=session_.user.properties,
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                              key=key, value=value)
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class DelForUserRelationHook(AddForUserRelationHook):
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    __regid__ = 'delcwpropforuser'
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    events = ('after_delete_relation',)
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    def __call__(self):
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        session = self._cw
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        key = session.execute('Any K WHERE P eid %(x)s, P pkey K',
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                              {'x': self.eidfrom})[0][0]
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        session.transaction_data.setdefault('pendingrelations', []).append(
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            (self.eidfrom, self.rtype, self.eidto))
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        for session_ in get_user_sessions(session.repo, self.eidto):
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            _DelCWPropertyOp(session, cwpropdict=session_.user.properties, key=key)