[entity] introduce a new 'adapters' registry
This changeset introduces the notion in adapters (as in Zope Component Architecture)
in a cubicweb way, eg using a specific registry of appobjects.
This allows nicer code structure, by avoid clutering entity classes and moving
code usually specific to a place of the ui (or something else) together with the
code that use the interface.
We don't use actual interface anymore, they are implied by adapters (which
may be abstract), whose reg id is an interface name.
Appobjects that used to 'implements(IFace)' should now be rewritten by:
* coding an IFaceAdapter(EntityAdapter) defining (implementing if desired)
the interface, usually with __regid__ = 'IFace'
* use "adaptable('IFace')" as selector instead
Also, the implements_adapter_compat decorator eases backward compatibility
with adapter's methods that may still be found on entities implementing
the interface.
Notice that unlike ZCA, we don't support automatic adapters chain (yagni?).
All interfaces defined in cubicweb have been turned into adapters, also
some new ones have been introduced to cleanup Entity / AnyEntity classes
namespace. At the end, the pluggable mixins mecanism should disappear in
favor of adapters as well.
# copyright 2003-2010 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
#
# This file is part of CubicWeb.
#
# CubicWeb is free software: you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 2.1 of the License, or (at your option)
# any later version.
#
# CubicWeb 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 Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License along
# with CubicWeb. If not, see <http://www.gnu.org/licenses/>.
"""some utilities to define schema permissions
"""
__docformat__ = "restructuredtext en"
from rql.utils import quote
from cubicweb.schema import RO_REL_PERMS, RO_ATTR_PERMS, \
PUB_SYSTEM_ENTITY_PERMS, PUB_SYSTEM_REL_PERMS, \
ERQLExpression, RRQLExpression
# permissions for "meta" entity type (readable by anyone, can only be
# added/deleted by managers)
META_ETYPE_PERMS = PUB_SYSTEM_ENTITY_PERMS # XXX deprecates
# permissions for "meta" relation type (readable by anyone, can only be
# added/deleted by managers)
META_RTYPE_PERMS = PUB_SYSTEM_REL_PERMS # XXX deprecates
# permissions for relation type that should only set by hooks using unsafe
# execute, readable by anyone
HOOKS_RTYPE_PERMS = RO_REL_PERMS # XXX deprecates
def _perm(names):
if isinstance(names, (list, tuple)):
if len(names) == 1:
names = quote(names[0])
else:
names = 'IN (%s)' % (','.join(quote(name) for name in names))
else:
names = quote(names)
#return u' require_permission P, P name %s, U in_group G, P require_group G' % names
return u' require_permission P, P name %s, U has_group_permission P' % names
def xperm(*names):
return 'X' + _perm(names)
def xexpr(*names):
return ERQLExpression(xperm(*names))
def xrexpr(relation, *names):
return ERQLExpression('X %s Y, Y %s' % (relation, _perm(names)))
def xorexpr(relation, etype, *names):
return ERQLExpression('Y %s X, X is %s, Y %s' % (relation, etype, _perm(names)))
def sexpr(*names):
return RRQLExpression('S' + _perm(names), 'S')
def restricted_sexpr(restriction, *names):
rql = '%s, %s' % (restriction, 'S' + _perm(names))
return RRQLExpression(rql, 'S')
def restricted_oexpr(restriction, *names):
rql = '%s, %s' % (restriction, 'O' + _perm(names))
return RRQLExpression(rql, 'O')
def oexpr(*names):
return RRQLExpression('O' + _perm(names), 'O')
# def supdate_perm():
# return RRQLExpression('U has_update_permission S', 'S')
# def oupdate_perm():
# return RRQLExpression('U has_update_permission O', 'O')
def relxperm(rel, role, *names):
assert role in ('subject', 'object')
if role == 'subject':
zxrel = ', X %s Z' % rel
else:
zxrel = ', Z %s X' % rel
return 'Z' + _perm(names) + zxrel
def relxexpr(rel, role, *names):
return ERQLExpression(relxperm(rel, role, *names))