616 lines
28 KiB
Python
616 lines
28 KiB
Python
# Copyright (c) 2012 OpenStack Foundation.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import netaddr
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import webob.exc
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from oslo_log import log as logging
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from oslo_utils import strutils
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from tacker._i18n import _
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from tacker.api import api_common
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from tacker.api.v1 import attributes
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from tacker.api.v1 import resource as wsgi_resource
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from tacker.common import exceptions
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from tacker.common import rpc as n_rpc
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from tacker import policy
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LOG = logging.getLogger(__name__)
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FAULT_MAP = {exceptions.NotFound: webob.exc.HTTPNotFound,
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exceptions.Conflict: webob.exc.HTTPConflict,
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exceptions.InUse: webob.exc.HTTPConflict,
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exceptions.BadRequest: webob.exc.HTTPBadRequest,
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exceptions.ServiceUnavailable: webob.exc.HTTPServiceUnavailable,
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exceptions.NotAuthorized: webob.exc.HTTPForbidden,
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netaddr.AddrFormatError: webob.exc.HTTPBadRequest,
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}
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class Controller(object):
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LIST = 'list'
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SHOW = 'show'
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CREATE = 'create'
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UPDATE = 'update'
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DELETE = 'delete'
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def __init__(self, plugin, collection, resource, attr_info,
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allow_bulk=False, member_actions=None, parent=None,
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allow_pagination=False, allow_sorting=False):
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member_actions = member_actions or []
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self._plugin = plugin
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self._collection = collection.replace('-', '_')
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self._resource = resource.replace('-', '_')
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self._attr_info = attr_info
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self._allow_bulk = allow_bulk
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self._allow_pagination = allow_pagination
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self._allow_sorting = allow_sorting
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self._native_bulk = self._is_native_bulk_supported()
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self._native_pagination = self._is_native_pagination_supported()
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self._native_sorting = self._is_native_sorting_supported()
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self._policy_attrs = [name for (name, info) in self._attr_info.items()
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if info.get('required_by_policy')]
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self._notifier = n_rpc.get_notifier('nfv')
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self._member_actions = member_actions
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self._primary_key = self._get_primary_key()
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if self._allow_pagination and self._native_pagination:
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# Native pagination need native sorting support
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if not self._native_sorting:
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raise exceptions.Invalid(
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_("Native pagination depend on native sorting")
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)
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if not self._allow_sorting:
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LOG.info("Allow sorting is enabled because native "
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"pagination requires native sorting")
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self._allow_sorting = True
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if parent:
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self._parent_id_name = '%s_id' % parent['member_name']
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parent_part = '_%s' % parent['member_name']
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else:
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self._parent_id_name = None
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parent_part = ''
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self._plugin_handlers = {
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self.LIST: 'get%s_%s' % (parent_part, self._collection),
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self.SHOW: 'get%s_%s' % (parent_part, self._resource)
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}
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for action in [self.CREATE, self.UPDATE, self.DELETE]:
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self._plugin_handlers[action] = '%s%s_%s' % (action, parent_part,
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self._resource)
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def _get_primary_key(self, default_primary_key='id'):
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for key, value in (self._attr_info).items():
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if value.get('primary_key', False):
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return key
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return default_primary_key
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def _is_native_bulk_supported(self):
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native_bulk_attr_name = ("_%s__native_bulk_support"
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% self._plugin.__class__.__name__)
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return getattr(self._plugin, native_bulk_attr_name, False)
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def _is_native_pagination_supported(self):
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native_pagination_attr_name = ("_%s__native_pagination_support"
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% self._plugin.__class__.__name__)
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return getattr(self._plugin, native_pagination_attr_name, False)
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def _is_native_sorting_supported(self):
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native_sorting_attr_name = ("_%s__native_sorting_support"
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% self._plugin.__class__.__name__)
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return getattr(self._plugin, native_sorting_attr_name, False)
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def _exclude_attributes_by_policy(self, context, data):
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"""Identifies attributes to exclude according to authZ policies.
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Return a list of attribute names which should be stripped from the
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response returned to the user because the user is not authorized
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to see them.
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"""
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attributes_to_exclude = []
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for attr_name in data:
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attr_data = self._attr_info.get(attr_name)
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if attr_data and attr_data['is_visible']:
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if policy.check(
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context,
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'%s:%s' % (self._plugin_handlers[self.SHOW], attr_name),
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data,
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might_not_exist=True):
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# this attribute is visible, check next one
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continue
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# if the code reaches this point then either the policy check
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# failed or the attribute was not visible in the first place
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attributes_to_exclude.append(attr_name)
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return attributes_to_exclude
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def _view(self, context, data, fields_to_strip=None):
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"""Build a view of an API resource.
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:param context: the tacker context
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:param data: the object for which a view is being created
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:param fields_to_strip: attributes to remove from the view
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:returns: a view of the object which includes only attributes
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visible according to API resource declaration and authZ policies.
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"""
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fields_to_strip = ((fields_to_strip or []) +
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self._exclude_attributes_by_policy(context, data))
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return self._filter_attributes(context, data, fields_to_strip)
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def _filter_attributes(self, context, data, fields_to_strip=None):
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if not fields_to_strip:
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return data
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return dict(item for item in (data).items()
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if (item[0] not in fields_to_strip))
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def _do_field_list(self, original_fields):
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fields_to_add = None
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# don't do anything if fields were not specified in the request
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if original_fields:
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fields_to_add = [attr for attr in self._policy_attrs
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if attr not in original_fields]
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original_fields.extend(self._policy_attrs)
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return original_fields, fields_to_add
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def __getattr__(self, name):
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if name in self._member_actions:
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def _handle_action(request, id, **kwargs):
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arg_list = [request.context, id]
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# Ensure policy engine is initialized
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policy.init()
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# Fetch the resource and verify if the user can access it
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try:
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resource = self._item(request, id, True)
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except exceptions.PolicyNotAuthorized:
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msg = _('The resource could not be found.')
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raise webob.exc.HTTPNotFound(msg)
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body = kwargs.pop('body', None)
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# Explicit comparison with None to distinguish from {}
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if body is not None:
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arg_list.append(body)
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# It is ok to raise a 403 because accessibility to the
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# object was checked earlier in this method
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policy.enforce(request.context, name, resource)
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return getattr(self._plugin, name)(*arg_list, **kwargs)
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return _handle_action
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else:
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raise AttributeError
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def _get_pagination_helper(self, request):
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if self._allow_pagination and self._native_pagination:
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return api_common.PaginationNativeHelper(request,
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self._primary_key)
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elif self._allow_pagination:
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return api_common.PaginationEmulatedHelper(request,
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self._primary_key)
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return api_common.NoPaginationHelper(request, self._primary_key)
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def _get_sorting_helper(self, request):
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if self._allow_sorting and self._native_sorting:
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return api_common.SortingNativeHelper(request, self._attr_info)
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elif self._allow_sorting:
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return api_common.SortingEmulatedHelper(request, self._attr_info)
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return api_common.NoSortingHelper(request, self._attr_info)
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def _items(self, request, do_authz=False, parent_id=None):
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"""Retrieves and formats a list of elements of the requested entity."""
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# NOTE(salvatore-orlando): The following ensures that fields which
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# are needed for authZ policy validation are not stripped away by the
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# plugin before returning.
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original_fields, fields_to_add = self._do_field_list(
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api_common.list_args(request, 'fields'))
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filters = api_common.get_filters(request, self._attr_info,
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['fields', 'sort_key', 'sort_dir',
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'limit', 'marker', 'page_reverse'])
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kwargs = {'filters': filters,
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'fields': original_fields}
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sorting_helper = self._get_sorting_helper(request)
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pagination_helper = self._get_pagination_helper(request)
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sorting_helper.update_args(kwargs)
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sorting_helper.update_fields(original_fields, fields_to_add)
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pagination_helper.update_args(kwargs)
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pagination_helper.update_fields(original_fields, fields_to_add)
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if parent_id:
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kwargs[self._parent_id_name] = parent_id
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obj_getter = getattr(self._plugin, self._plugin_handlers[self.LIST])
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obj_list = obj_getter(request.context, **kwargs)
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obj_list = sorting_helper.sort(obj_list)
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obj_list = pagination_helper.paginate(obj_list)
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# Check authz
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if do_authz:
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# FIXME(salvatore-orlando): obj_getter might return references to
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# other resources. Must check authZ on them too.
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# Omit items from list that should not be visible
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obj_list = [obj for obj in obj_list
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if policy.check(request.context,
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self._plugin_handlers[self.SHOW],
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obj,
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plugin=self._plugin)]
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# Use the first element in the list for discriminating which attributes
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# should be filtered out because of authZ policies
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# fields_to_add contains a list of attributes added for request policy
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# checks but that were not required by the user. They should be
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# therefore stripped
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fields_to_strip = fields_to_add or []
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if obj_list:
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fields_to_strip += self._exclude_attributes_by_policy(
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request.context, obj_list[0])
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collection = {self._collection:
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[self._filter_attributes(
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request.context, obj,
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fields_to_strip=fields_to_strip)
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for obj in obj_list]}
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pagination_links = pagination_helper.get_links(obj_list)
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if pagination_links:
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collection[self._collection + "_links"] = pagination_links
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return collection
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def _item(self, request, id, do_authz=False, field_list=None,
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parent_id=None):
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"""Retrieves and formats a single element of the requested entity."""
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kwargs = {'fields': field_list}
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action = self._plugin_handlers[self.SHOW]
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if parent_id:
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kwargs[self._parent_id_name] = parent_id
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obj_getter = getattr(self._plugin, action)
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obj = obj_getter(request.context, id, **kwargs)
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# Check authz
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# FIXME(salvatore-orlando): obj_getter might return references to
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# other resources. Must check authZ on them too.
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if do_authz:
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policy.enforce(request.context, action, obj)
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return obj
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def index(self, request, **kwargs):
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"""Returns a list of the requested entity."""
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parent_id = kwargs.get(self._parent_id_name)
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# Ensure policy engine is initialized
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policy.init()
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return self._items(request, True, parent_id)
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def show(self, request, id, **kwargs):
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"""Returns detailed information about the requested entity."""
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try:
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# NOTE(salvatore-orlando): The following ensures that fields
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# which are needed for authZ policy validation are not stripped
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# away by the plugin before returning.
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field_list, added_fields = self._do_field_list(
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api_common.list_args(request, "fields"))
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parent_id = kwargs.get(self._parent_id_name)
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# Ensure policy engine is initialized
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policy.init()
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return {self._resource:
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self._view(request.context,
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self._item(request,
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id,
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do_authz=True,
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field_list=field_list,
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parent_id=parent_id),
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fields_to_strip=added_fields)}
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except exceptions.PolicyNotAuthorized:
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# To avoid giving away information, pretend that it
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# doesn't exist
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msg = _('The resource could not be found.')
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raise webob.exc.HTTPNotFound(msg)
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def _emulate_bulk_create(self, obj_creator, request, body, parent_id=None):
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objs = []
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try:
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for item in body[self._collection]:
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kwargs = {self._resource: item}
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if parent_id:
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kwargs[self._parent_id_name] = parent_id
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fields_to_strip = self._exclude_attributes_by_policy(
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request.context, item)
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objs.append(self._filter_attributes(
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request.context,
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obj_creator(request.context, **kwargs),
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fields_to_strip=fields_to_strip))
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return objs
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# Note(salvatore-orlando): broad catch as in theory a plugin
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# could raise any kind of exception
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except Exception:
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for obj in objs:
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obj_deleter = getattr(self._plugin,
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self._plugin_handlers[self.DELETE])
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try:
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kwargs = ({self._parent_id_name: parent_id} if parent_id
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else {})
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obj_deleter(request.context, obj['id'], **kwargs)
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except Exception:
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# broad catch as our only purpose is to log the exception
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LOG.exception("Unable to undo add for %(resource)s %(id)s",
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{'resource': self._resource,
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'id': obj['id']})
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# TODO(salvatore-orlando): The object being processed when the
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# plugin raised might have been created or not in the db.
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# We need a way for ensuring that if it has been created,
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# it is then deleted
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raise
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def create(self, request, body=None, **kwargs):
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"""Creates a new instance of the requested entity."""
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parent_id = kwargs.get(self._parent_id_name)
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self._notifier.info(request.context,
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self._resource + '.create.start',
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body)
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body = Controller.prepare_request_body(request.context, body, True,
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self._resource, self._attr_info,
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allow_bulk=self._allow_bulk)
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action = self._plugin_handlers[self.CREATE]
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# Check authz
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if self._collection in body:
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# Have to account for bulk create
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items = body[self._collection]
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else:
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items = [body]
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# Ensure policy engine is initialized
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policy.init()
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for item in items:
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policy.enforce(request.context,
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action,
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item[self._resource])
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def notify(create_result):
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notifier_method = self._resource + '.create.end'
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self._notifier.info(request.context,
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notifier_method,
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create_result)
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return create_result
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kwargs = {self._parent_id_name: parent_id} if parent_id else {}
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if self._collection in body and self._native_bulk:
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# plugin does atomic bulk create operations
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obj_creator = getattr(self._plugin, "%s_bulk" % action)
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objs = obj_creator(request.context, body, **kwargs)
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# Use first element of list to discriminate attributes which
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# should be removed because of authZ policies
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fields_to_strip = self._exclude_attributes_by_policy(
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request.context, objs[0])
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return notify({self._collection: [self._filter_attributes(
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request.context, obj, fields_to_strip=fields_to_strip)
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for obj in objs]})
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else:
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obj_creator = getattr(self._plugin, action)
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if self._collection in body:
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# Emulate atomic bulk behavior
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objs = self._emulate_bulk_create(obj_creator, request,
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body, parent_id)
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return notify({self._collection: objs})
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else:
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kwargs.update({self._resource: body})
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obj = obj_creator(request.context, **kwargs)
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return notify({self._resource: self._view(request.context,
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obj)})
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def delete(self, request, id, body=None, **kwargs):
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"""Deletes the specified entity."""
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self._notifier.info(request.context,
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self._resource + '.delete.start',
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{self._resource + '_id': id})
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action = self._plugin_handlers[self.DELETE]
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# Check authz
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policy.init()
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parent_id = kwargs.get(self._parent_id_name)
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obj = self._item(request, id, parent_id=parent_id)
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try:
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policy.enforce(request.context,
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action,
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obj)
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except exceptions.PolicyNotAuthorized:
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# To avoid giving away information, pretend that it
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# doesn't exist
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msg = _('The resource could not be found.')
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raise webob.exc.HTTPNotFound(msg)
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obj_deleter = getattr(self._plugin, action)
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if body:
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kwargs.update({self._resource: body})
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obj_deleter(request.context, id, **kwargs)
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notifier_method = self._resource + '.delete.end'
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self._notifier.info(request.context,
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notifier_method,
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{self._resource + '_id': id})
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def update(self, request, id, body=None, **kwargs):
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"""Updates the specified entity's attributes."""
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parent_id = kwargs.get(self._parent_id_name)
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try:
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payload = body.copy()
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except AttributeError:
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msg = _("Invalid format: %s") % request.body
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raise exceptions.BadRequest(resource='body', msg=msg)
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payload['id'] = id
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self._notifier.info(request.context,
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self._resource + '.update.start',
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payload)
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body = Controller.prepare_request_body(request.context, body, False,
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self._resource, self._attr_info,
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allow_bulk=self._allow_bulk)
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action = self._plugin_handlers[self.UPDATE]
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# Load object to check authz
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# but pass only attributes in the original body and required
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# by the policy engine to the policy 'brain'
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field_list = [name for (name, value) in (self._attr_info).items()
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if (value.get('required_by_policy') or
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value.get('primary_key') or
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'default' not in value)]
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# Ensure policy engine is initialized
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policy.init()
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orig_obj = self._item(request, id, field_list=field_list,
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parent_id=parent_id)
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orig_obj.update(body[self._resource])
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attribs = attributes.ATTRIBUTES_TO_UPDATE
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orig_obj[attribs] = body[self._resource].keys()
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try:
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policy.enforce(request.context,
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action,
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orig_obj)
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except exceptions.PolicyNotAuthorized:
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# To avoid giving away information, pretend that it
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# doesn't exist
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msg = _('The resource could not be found.')
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raise webob.exc.HTTPNotFound(msg)
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obj_updater = getattr(self._plugin, action)
|
|
kwargs = {self._resource: body}
|
|
if parent_id:
|
|
kwargs[self._parent_id_name] = parent_id
|
|
obj = obj_updater(request.context, id, **kwargs)
|
|
result = {self._resource: self._view(request.context, obj)}
|
|
notifier_method = self._resource + '.update.end'
|
|
self._notifier.info(request.context, notifier_method, result)
|
|
return result
|
|
|
|
@staticmethod
|
|
def _populate_tenant_id(context, res_dict, is_create):
|
|
|
|
if (('tenant_id' in res_dict and
|
|
res_dict['tenant_id'] != context.tenant_id and
|
|
not context.is_admin)):
|
|
msg = _("Specifying 'tenant_id' other than authenticated "
|
|
"tenant in request requires admin privileges")
|
|
raise webob.exc.HTTPBadRequest(msg)
|
|
|
|
if is_create and 'tenant_id' not in res_dict:
|
|
if context.tenant_id:
|
|
res_dict['tenant_id'] = context.tenant_id
|
|
res_dict['project_id'] = context.tenant_id
|
|
else:
|
|
msg = _("Running without keystone AuthN requires "
|
|
"that tenant_id is specified")
|
|
raise webob.exc.HTTPBadRequest(msg)
|
|
|
|
@staticmethod
|
|
def prepare_request_body(context, body, is_create, resource, attr_info,
|
|
allow_bulk=False):
|
|
"""Verifies required attributes are in request body.
|
|
|
|
Also checking that an attribute is only specified if it is allowed
|
|
for the given operation (create/update).
|
|
|
|
Attribute with default values are considered to be optional.
|
|
|
|
body argument must be the deserialized body.
|
|
"""
|
|
collection = resource + "s"
|
|
if not body:
|
|
raise webob.exc.HTTPBadRequest(_("Resource body required"))
|
|
|
|
LOG.debug("Request body: %(body)s",
|
|
{'body': strutils.mask_password(body)})
|
|
prep_req_body = lambda x: Controller.prepare_request_body( # noqa
|
|
context,
|
|
x if resource in x else {resource: x},
|
|
is_create,
|
|
resource,
|
|
attr_info,
|
|
allow_bulk)
|
|
if collection in body:
|
|
if not allow_bulk:
|
|
raise webob.exc.HTTPBadRequest(_("Bulk operation "
|
|
"not supported"))
|
|
bulk_body = [prep_req_body(item) for item in body[collection]]
|
|
if not bulk_body:
|
|
raise webob.exc.HTTPBadRequest(_("Resources required"))
|
|
return {collection: bulk_body}
|
|
|
|
res_dict = body.get(resource)
|
|
if res_dict is None:
|
|
msg = _("Unable to find '%s' in request body") % resource
|
|
raise webob.exc.HTTPBadRequest(msg)
|
|
|
|
Controller._populate_tenant_id(context, res_dict, is_create)
|
|
Controller._verify_attributes(res_dict, attr_info)
|
|
|
|
if is_create: # POST
|
|
for attr, attr_vals in (attr_info).items():
|
|
if attr_vals['allow_post']:
|
|
if ('default' not in attr_vals and
|
|
attr not in res_dict):
|
|
msg = _("Failed to parse request. Required "
|
|
"attribute '%s' not specified") % attr
|
|
raise webob.exc.HTTPBadRequest(msg)
|
|
res_dict[attr] = res_dict.get(attr,
|
|
attr_vals.get('default'))
|
|
else:
|
|
if attr in res_dict:
|
|
msg = _("Attribute '%s' not allowed in POST") % attr
|
|
raise webob.exc.HTTPBadRequest(msg)
|
|
else: # PUT
|
|
for attr, attr_vals in (attr_info).items():
|
|
if attr in res_dict and not attr_vals['allow_put']:
|
|
msg = _("Cannot update read-only attribute %s") % attr
|
|
raise webob.exc.HTTPBadRequest(msg)
|
|
|
|
for attr, attr_vals in (attr_info).items():
|
|
if (attr not in res_dict or
|
|
res_dict[attr] is attributes.ATTR_NOT_SPECIFIED):
|
|
continue
|
|
# Convert values if necessary
|
|
if 'convert_to' in attr_vals:
|
|
res_dict[attr] = attr_vals['convert_to'](res_dict[attr])
|
|
# Check that configured values are correct
|
|
if 'validate' not in attr_vals:
|
|
continue
|
|
for rule in attr_vals['validate']:
|
|
# skip validating vnfd_id when vnfd_template is specified to
|
|
# create vnf
|
|
if (resource == 'vnf') and ('vnfd_template' in body['vnf'])\
|
|
and (attr == "vnfd_id") and is_create:
|
|
continue
|
|
# skip validating vnffgd_id when vnffgd_template is provided
|
|
if ((resource == 'vnffg')
|
|
and ('vnffgd_template' in body['vnffg'])
|
|
and (attr == 'vnffgd_id') and is_create):
|
|
continue
|
|
# skip validating nsd_id when nsd_template is provided
|
|
if (resource == 'ns') and ('nsd_template' in body['ns'])\
|
|
and (attr == 'nsd_id') and is_create:
|
|
continue
|
|
res = attributes.validators[rule](res_dict[attr],
|
|
attr_vals['validate'][rule])
|
|
if res:
|
|
msg_dict = dict(attr=attr, reason=res)
|
|
msg = _("Invalid input for %(attr)s. "
|
|
"Reason: %(reason)s.") % msg_dict
|
|
raise webob.exc.HTTPBadRequest(msg)
|
|
return body
|
|
|
|
@staticmethod
|
|
def _verify_attributes(res_dict, attr_info):
|
|
# TODO(h-asahina): The `project_id` is not included in attr_info, but
|
|
# it is used as an alternative of `tenant_id` which is already
|
|
# deprecated in oslo.context. Excluding `project_id` from the
|
|
# verification is a workaround to avoid directly modifying attr_info
|
|
# which has a strong influence on the existing code.
|
|
excluded = {'project_id'}
|
|
extra_keys = set(res_dict.keys()) - set(attr_info.keys()) - excluded
|
|
if extra_keys:
|
|
msg = _("Unrecognized attribute(s) '%s'") % ', '.join(extra_keys)
|
|
raise webob.exc.HTTPBadRequest(msg)
|
|
|
|
|
|
def create_resource(collection, resource, plugin, params, allow_bulk=False,
|
|
member_actions=None, parent=None, allow_pagination=False,
|
|
allow_sorting=False):
|
|
controller = Controller(plugin, collection, resource, params, allow_bulk,
|
|
member_actions=member_actions, parent=parent,
|
|
allow_pagination=allow_pagination,
|
|
allow_sorting=allow_sorting)
|
|
|
|
return wsgi_resource.Resource(controller, FAULT_MAP)
|