from cubicweb.server import BEFORE_ADD_RELATIONS, ON_COMMIT_ADD_RELATIONS, hook

        editedattrs = entity

class _CheckEntityPermissionOp(hook.LateOperation):

class _CheckRelationPermissionOp(hook.LateOperation):

        self.rschema.check_perm(self.session, self.action, self.eidfrom, self.eidto)

class SecurityHook(hook.Hook):

    __abstract__ = True

    category = 'security'

    __select__ = hook.Hook.__select__ & hook.regular_session()

class AfterAddEntitySecurityHook(SecurityHook):

    __id__ = 'securityafteraddentity'

    events = ('after_add_entity',)

    def __call__(self):

        _CheckEntityPermissionOp(self.cw_req, entity=self.entity, action='add')

class AfterUpdateEntitySecurityHook(SecurityHook):

    __id__ = 'securityafterupdateentity'

    events = ('after_update_entity',)

    def __call__(self):

            self.entity.check_perm('update')

            check_entity_attributes(self.cw_req, self.entity)

            self.entity.clear_local_perm_cache('update')

            _CheckEntityPermissionOp(self.cw_req, entity=self.entity, action='update')

class BeforeDelEntitySecurityHook(SecurityHook):

    __id__ = 'securitybeforedelentity'

    events = ('before_delete_entity',)

    def __call__(self):

        self.entity.e_schema.check_perm(self.cw_req, 'delete', eid)

class BeforeAddRelationSecurityHook(SecurityHook):

    __id__ = 'securitybeforeaddrelation'

    events = ('before_add_relation',)

    def __call__(self):

        if self.rtype in BEFORE_ADD_RELATIONS:

            rschema = self.cw_req.repo.schema[self.rtype]

            rschema.check_perm(self.cw_req, 'add', self.eidfrom, self.eidto)

class AfterAddRelationSecurityHook(SecurityHook):

    __id__ = 'securityafteraddrelation'

    events = ('after_add_relation',)

    def __call__(self):

        if not self.rtype in BEFORE_ADD_RELATIONS:

            rschema = self.cw_req.repo.schema[self.rtype]

            if self.rtype in ON_COMMIT_ADD_RELATIONS:

                _CheckRelationPermissionOp(self.cw_req, action='add',

                                           rschema=rschema,

                                           eidfrom=self.eidfrom,

                                           eidto=self.eidto)

            else:

                rschema.check_perm(self.cw_req, 'add', self.eidfrom, self.eidto)

class BeforeDelRelationSecurityHook(SecurityHook):

    __id__ = 'securitybeforedelrelation'

    events = ('before_delete_relation',)

    def __call__(self):

        self.cw_req.repo.schema[self.rtype].check_perm(self.cw_req, 'delete',

                                                       self.eidfrom, self.eidto)