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# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""Role-based access control decorators to use fpr wrapping other
methods with."""
from nova import exception
def allow(*roles):
"""Allow the given roles access the wrapped function."""
def wrap(func): # pylint: disable-msg=C0111
def wrapped_func(self, context, *args,
**kwargs): # pylint: disable-msg=C0111
if context.user.is_superuser():
return func(self, context, *args, **kwargs)
for role in roles:
if __matches_role(context, role):
return func(self, context, *args, **kwargs)
raise exception.NotAuthorized()
return wrapped_func
return wrap
def deny(*roles):
"""Deny the given roles access the wrapped function."""
def wrap(func): # pylint: disable-msg=C0111
def wrapped_func(self, context, *args,
**kwargs): # pylint: disable-msg=C0111
if context.user.is_superuser():
return func(self, context, *args, **kwargs)
for role in roles:
if __matches_role(context, role):
raise exception.NotAuthorized()
return func(self, context, *args, **kwargs)
return wrapped_func
return wrap
def __matches_role(context, role):
"""Check if a role is allowed."""
if role == 'all':
return True
if role == 'none':
return False
return context.project.has_role(context.user.id, role)
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