# vim: tabstop=4 shiftwidth=4 softtabstop=4

# Copyright (c) 2012 OpenStack, LLC
#
#    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.
"""
Request Body limiting middleware.

"""

import webob.dec
import webob.exc

from nova.openstack.common import cfg
from nova.openstack.common import log as logging
from nova import wsgi


#default request size is 112k
max_request_body_size_opt = cfg.IntOpt('osapi_max_request_body_size',
                                       default=114688,
                                       help='the maximum body size '
                                            'per each osapi request(bytes)')

CONF = cfg.CONF
CONF.register_opt(max_request_body_size_opt)
LOG = logging.getLogger(__name__)


class RequestBodySizeLimiter(wsgi.Middleware):
    """Add a 'nova.context' to WSGI environ."""

    def __init__(self, *args, **kwargs):
        super(RequestBodySizeLimiter, self).__init__(*args, **kwargs)

    @webob.dec.wsgify(RequestClass=wsgi.Request)
    def __call__(self, req):
        if (req.content_length > CONF.osapi_max_request_body_size
            or len(req.body) > CONF.osapi_max_request_body_size):
            msg = _("Request is too large.")
            raise webob.exc.HTTPBadRequest(explanation=msg)
        else:
            return self.application
