84 lines
2.8 KiB
Python
84 lines
2.8 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright (c) 2012 OpenStack, LLC
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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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"""
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Request Body limiting middleware.
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"""
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from oslo.config import cfg
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import webob.dec
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import webob.exc
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from cinder import flags
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from cinder.openstack.common import log as logging
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from cinder import wsgi
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#default request size is 112k
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max_request_body_size_opt = cfg.IntOpt('osapi_max_request_body_size',
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default=114688,
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help='Max size for body of a request')
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FLAGS = flags.FLAGS
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FLAGS.register_opt(max_request_body_size_opt)
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LOG = logging.getLogger(__name__)
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class LimitingReader(object):
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"""Reader to limit the size of an incoming request."""
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def __init__(self, data, limit):
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"""
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:param data: Underlying data object
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:param limit: maximum number of bytes the reader should allow
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"""
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self.data = data
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self.limit = limit
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self.bytes_read = 0
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def __iter__(self):
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for chunk in self.data:
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self.bytes_read += len(chunk)
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if self.bytes_read > self.limit:
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msg = _("Request is too large.")
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raise webob.exc.HTTPRequestEntityTooLarge(explanation=msg)
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else:
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yield chunk
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def read(self, i=None):
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result = self.data.read(i)
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self.bytes_read += len(result)
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if self.bytes_read > self.limit:
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msg = _("Request is too large.")
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raise webob.exc.HTTPRequestEntityTooLarge(explanation=msg)
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return result
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class RequestBodySizeLimiter(wsgi.Middleware):
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"""Add a 'cinder.context' to WSGI environ."""
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def __init__(self, *args, **kwargs):
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super(RequestBodySizeLimiter, self).__init__(*args, **kwargs)
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@webob.dec.wsgify(RequestClass=wsgi.Request)
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def __call__(self, req):
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if req.content_length > FLAGS.osapi_max_request_body_size:
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msg = _("Request is too large.")
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raise webob.exc.HTTPRequestEntityTooLarge(explanation=msg)
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if req.content_length is None and req.is_body_readable:
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limiter = LimitingReader(req.body_file,
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FLAGS.osapi_max_request_body_size)
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req.body_file = limiter
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return self.application
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