74 lines
3.0 KiB
Python
74 lines
3.0 KiB
Python
# Copyright (c) 2017 NTT Inc.
|
|
#
|
|
# 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.
|
|
|
|
from oslo_serialization import jsonutils
|
|
import six
|
|
|
|
from blazar.api.v1 import app as v1_app
|
|
from blazar.api.v2 import app as v2_app
|
|
|
|
|
|
class VersionSelectorApplication(object):
|
|
"""Maps WSGI versioned apps and defines default WSGI app."""
|
|
|
|
def __init__(self):
|
|
self._status = ''
|
|
self._response_headers = []
|
|
self.v1 = v1_app.make_app()
|
|
self.v2 = v2_app.make_app()
|
|
|
|
def _append_versions_from_app(self, versions, app, environ):
|
|
tmp_versions = app(environ, self.internal_start_response)
|
|
if self._status.startswith("300"):
|
|
# In case of v1, app returns ClosingIterator generator object,
|
|
# whereas in case of v2, it returns list.
|
|
# So convert it to iterator to get the versions.
|
|
app_iter = iter(tmp_versions)
|
|
tmp_versions = jsonutils.loads(six.next(app_iter))
|
|
versions['versions'].extend(tmp_versions['versions'])
|
|
return tmp_versions
|
|
|
|
def internal_start_response(self, status, response_headers, exc_info=None):
|
|
self._status = status
|
|
self._response_headers = response_headers
|
|
|
|
def __call__(self, environ, start_response):
|
|
self._status = ''
|
|
self._response_headers = []
|
|
|
|
if environ['PATH_INFO'] == '/' or environ['PATH_INFO'] == '/versions':
|
|
versions = {'versions': []}
|
|
tmp_versions = self._append_versions_from_app(versions, self.v1,
|
|
environ)
|
|
# Both v1 and v2 apps run auth_token middleware. So simply
|
|
# validate token for v1. If it fails no need to call v2 app.
|
|
if self._status.startswith("401"):
|
|
start_response(self._status,
|
|
[("Content-Type", "application/json")])
|
|
return tmp_versions
|
|
self._append_versions_from_app(versions, self.v2,
|
|
environ)
|
|
if len(versions['versions']):
|
|
start_response("300 Multiple Choices",
|
|
[("Content-Type", "application/json")])
|
|
return [jsonutils.dump_as_bytes(versions)]
|
|
else:
|
|
start_response("204 No Content", [])
|
|
return []
|
|
else:
|
|
if environ['PATH_INFO'].startswith('/v1'):
|
|
return self.v1(environ, start_response)
|
|
return self.v2(environ, start_response)
|