/usr/lib/python2.7/dist-packages/aodh/api/middleware.py is in python-aodh 2.0.0-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 | #
# Copyright 2013 IBM Corp.
# Copyright 2012 New Dream Network, LLC (DreamHost)
#
# 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.
"""Middleware to replace the plain text message body of an error
response with one formatted so the client can parse it.
Based on pecan.middleware.errordocument
"""
import json
from lxml import etree
from oslo_log import log
import six
import webob
from aodh import i18n
from aodh.i18n import _
LOG = log.getLogger(__name__)
class ParsableErrorMiddleware(object):
"""Replace error body with something the client can parse."""
@staticmethod
def best_match_language(accept_language):
"""Determines best available locale from the Accept-Language header.
:returns: the best language match or None if the 'Accept-Language'
header was not available in the request.
"""
if not accept_language:
return None
all_languages = i18n.get_available_languages()
return accept_language.best_match(all_languages)
def __init__(self, app):
self.app = app
def __call__(self, environ, start_response):
# Request for this state, modified by replace_start_response()
# and used when an error is being reported.
state = {}
def replacement_start_response(status, headers, exc_info=None):
"""Overrides the default response to make errors parsable."""
try:
status_code = int(status.split(' ')[0])
state['status_code'] = status_code
except (ValueError, TypeError): # pragma: nocover
raise Exception((
'ErrorDocumentMiddleware received an invalid '
'status %s' % status
))
else:
if (state['status_code'] // 100) not in (2, 3):
# Remove some headers so we can replace them later
# when we have the full error message and can
# compute the length.
headers = [(h, v)
for (h, v) in headers
if h not in ('Content-Length', 'Content-Type')
]
# Save the headers in case we need to modify them.
state['headers'] = headers
return start_response(status, headers, exc_info)
app_iter = self.app(environ, replacement_start_response)
if (state['status_code'] // 100) not in (2, 3):
req = webob.Request(environ)
error = environ.get('translatable_error')
user_locale = self.best_match_language(req.accept_language)
if (req.accept.best_match(['application/json', 'application/xml'])
== 'application/xml'):
content_type = 'application/xml'
try:
# simple check xml is valid
fault = etree.fromstring(b'\n'.join(app_iter))
# Add the translated error to the xml data
if error is not None:
for fault_string in fault.findall('faultstring'):
fault_string.text = i18n.translate(error,
user_locale)
error_message = etree.tostring(fault)
body = b''.join((b'<error_message>',
error_message,
b'</error_message>'))
except etree.XMLSyntaxError as err:
LOG.error(_('Error parsing HTTP response: %s'), err)
error_message = state['status_code']
body = '<error_message>%s</error_message>' % error_message
if six.PY3:
body = body.encode('utf-8')
else:
content_type = 'application/json'
app_data = b'\n'.join(app_iter)
if six.PY3:
app_data = app_data.decode('utf-8')
try:
fault = json.loads(app_data)
if error is not None and 'faultstring' in fault:
fault['faultstring'] = i18n.translate(error,
user_locale)
except ValueError as err:
fault = app_data
body = json.dumps({'error_message': fault})
if six.PY3:
body = body.encode('utf-8')
state['headers'].append(('Content-Length', str(len(body))))
state['headers'].append(('Content-Type', content_type))
body = [body]
else:
body = app_iter
return body
|