/usr/share/pyshared/glance/registry/context.py is in python-glance 2012.1.3+stable~20120821-120fcf-0ubuntu1.5.
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# Copyright 2011 OpenStack LLC.
# 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.
from glance.common import context
from glance.common import exception
from glance.registry.db import api as db_api
class RequestContext(context.RequestContext):
"""
Stores information about the security context under which the user
accesses the system, as well as additional request information.
Also provides tests for image visibility and sharability.
"""
def is_image_visible(self, image):
"""Return True if the image is visible in this context."""
# Is admin == image visible
if self.is_admin:
return True
# No owner == image visible
if image.owner is None:
return True
# Image is_public == image visible
if image.is_public:
return True
# Perform tests based on whether we have an owner
if self.owner is not None:
if self.owner == image.owner:
return True
# Figure out if this image is shared with that tenant
try:
tmp = db_api.image_member_find(self, image.id, self.owner)
return not tmp['deleted']
except exception.NotFound:
pass
# Private image
return False
def is_image_mutable(self, image):
"""Return True if the image is mutable in this context."""
# Is admin == image mutable
if self.is_admin:
return True
# No owner == image not mutable
if image.owner is None or self.owner is None:
return False
# Image only mutable by its owner
return image.owner == self.owner
def is_image_sharable(self, image, **kwargs):
"""Return True if the image can be shared to others in this context."""
# Is admin == image sharable
if self.is_admin:
return True
# Only allow sharing if we have an owner
if self.owner is None:
return False
# If we own the image, we can share it
if self.owner == image.owner:
return True
# Let's get the membership association
if 'membership' in kwargs:
membership = kwargs['membership']
if membership is None:
# Not shared with us anyway
return False
else:
try:
membership = db_api.image_member_find(self, image.id,
self.owner)
except exception.NotFound:
# Not shared with us anyway
return False
# It's the can_share attribute we're now interested in
return membership.can_share
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