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# Copyright (c) 2010-2014 OpenStack Foundation.
#
# 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.
import functools
from swift.common.middleware.s3api.s3response import S3NotImplemented, \
InvalidRequest
from swift.common.middleware.s3api.utils import camel_to_snake
def bucket_operation(func=None, err_resp=None, err_msg=None):
"""
A decorator to ensure that the request is a bucket operation. If the
target resource is an object, this decorator updates the request by default
so that the controller handles it as a bucket operation. If 'err_resp' is
specified, this raises it on error instead.
"""
def _bucket_operation(func):
@functools.wraps(func)
def wrapped(self, req):
if not req.is_bucket_request:
if err_resp:
raise err_resp(msg=err_msg)
self.logger.debug('A key is specified for bucket API.')
req.object_name = None
return func(self, req)
return wrapped
if func:
return _bucket_operation(func)
else:
return _bucket_operation
def object_operation(func):
"""
A decorator to ensure that the request is an object operation. If the
target resource is not an object, this raises an error response.
"""
@functools.wraps(func)
def wrapped(self, req):
if not req.is_object_request:
raise InvalidRequest('A key must be specified')
return func(self, req)
return wrapped
def check_container_existence(func):
"""
A decorator to ensure the container existence.
"""
@functools.wraps(func)
def check_container(self, req):
req.get_container_info(self.app)
return func(self, req)
return check_container
class Controller(object):
"""
Base WSGI controller class for the middleware
"""
def __init__(self, app, conf, logger, **kwargs):
self.app = app
self.conf = conf
self.logger = logger
@classmethod
def resource_type(cls):
"""
Returns the target resource type of this controller.
"""
name = cls.__name__[:-len('Controller')]
return camel_to_snake(name).upper()
class UnsupportedController(Controller):
"""
Handles unsupported requests.
"""
def __init__(self, app, conf, logger, **kwargs):
raise S3NotImplemented('The requested resource is not implemented')
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