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# Copyright (c) 2013 NEC Corporation
# 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.
import logging
import re
import webob.dec
import webob.exc
from oslo_middleware import base
LOG = logging.getLogger(__name__)
_TOKEN_RE = re.compile('^(X-\w+-Token):.*$', flags=re.MULTILINE)
class CatchErrors(base.ConfigurableMiddleware):
"""Middleware that provides high-level error handling.
It catches all exceptions from subsequent applications in WSGI pipeline
to hide internal errors from API response.
"""
@webob.dec.wsgify
def __call__(self, req):
try:
response = req.get_response(self.application)
except Exception:
req_str = _TOKEN_RE.sub(r'\1: *****', req.as_text())
LOG.exception('An error occurred during '
'processing the request: %s', req_str)
response = webob.exc.HTTPInternalServerError()
return response
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