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+# Copyright 2012 OpenStack Foundation
+#
+# 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_log import log
+from oslo_serialization import jsonutils
+import webob
+
+from keystone.common import extension
+from keystone.common import json_home
+from keystone.common import wsgi
+from keystone import exception
+
+
+LOG = log.getLogger(__name__)
+
+MEDIA_TYPE_JSON = 'application/vnd.openstack.identity-%s+json'
+
+_VERSIONS = []
+
+# NOTE(blk-u): latest_app will be set by keystone.service.loadapp(). It gets
+# set to the application that was just loaded. In the case of keystone-all,
+# loadapp() gets called twice, once for the public app and once for the admin
+# app. In the case of httpd/keystone, loadapp() gets called once for the public
+# app if this is the public instance or loadapp() gets called for the admin app
+# if it's the admin instance.
+# This is used to fetch the /v3 JSON Home response. The /v3 JSON Home response
+# is the same whether it's the admin or public service so either admin or
+# public works.
+latest_app = None
+
+
+def request_v3_json_home(new_prefix):
+ if 'v3' not in _VERSIONS:
+ # No V3 support, so return an empty JSON Home document.
+ return {'resources': {}}
+
+ req = webob.Request.blank(
+ '/v3', headers={'Accept': 'application/json-home'})
+ v3_json_home_str = req.get_response(latest_app).body
+ v3_json_home = jsonutils.loads(v3_json_home_str)
+ json_home.translate_urls(v3_json_home, new_prefix)
+
+ return v3_json_home
+
+
+class Extensions(wsgi.Application):
+ """Base extensions controller to be extended by public and admin API's."""
+
+ # extend in subclass to specify the set of extensions
+ @property
+ def extensions(self):
+ return None
+
+ def get_extensions_info(self, context):
+ return {'extensions': {'values': self.extensions.values()}}
+
+ def get_extension_info(self, context, extension_alias):
+ try:
+ return {'extension': self.extensions[extension_alias]}
+ except KeyError:
+ raise exception.NotFound(target=extension_alias)
+
+
+class AdminExtensions(Extensions):
+ @property
+ def extensions(self):
+ return extension.ADMIN_EXTENSIONS
+
+
+class PublicExtensions(Extensions):
+ @property
+ def extensions(self):
+ return extension.PUBLIC_EXTENSIONS
+
+
+def register_version(version):
+ _VERSIONS.append(version)
+
+
+class MimeTypes(object):
+ JSON = 'application/json'
+ JSON_HOME = 'application/json-home'
+
+
+def v3_mime_type_best_match(context):
+
+ # accept_header is a WebOb MIMEAccept object so supports best_match.
+ accept_header = context['accept_header']
+
+ if not accept_header:
+ return MimeTypes.JSON
+
+ SUPPORTED_TYPES = [MimeTypes.JSON, MimeTypes.JSON_HOME]
+ return accept_header.best_match(SUPPORTED_TYPES)
+
+
+class Version(wsgi.Application):
+
+ def __init__(self, version_type, routers=None):
+ self.endpoint_url_type = version_type
+ self._routers = routers
+
+ super(Version, self).__init__()
+
+ def _get_identity_url(self, context, version):
+ """Returns a URL to keystone's own endpoint."""
+ url = self.base_url(context, self.endpoint_url_type)
+ return '%s/%s/' % (url, version)
+
+ def _get_versions_list(self, context):
+ """The list of versions is dependent on the context."""
+ versions = {}
+ if 'v2.0' in _VERSIONS:
+ versions['v2.0'] = {
+ 'id': 'v2.0',
+ 'status': 'stable',
+ 'updated': '2014-04-17T00:00:00Z',
+ 'links': [
+ {
+ 'rel': 'self',
+ 'href': self._get_identity_url(context, 'v2.0'),
+ }, {
+ 'rel': 'describedby',
+ 'type': 'text/html',
+ 'href': 'http://docs.openstack.org/'
+ }
+ ],
+ 'media-types': [
+ {
+ 'base': 'application/json',
+ 'type': MEDIA_TYPE_JSON % 'v2.0'
+ }
+ ]
+ }
+
+ if 'v3' in _VERSIONS:
+ versions['v3'] = {
+ 'id': 'v3.0',
+ 'status': 'stable',
+ 'updated': '2013-03-06T00:00:00Z',
+ 'links': [
+ {
+ 'rel': 'self',
+ 'href': self._get_identity_url(context, 'v3'),
+ }
+ ],
+ 'media-types': [
+ {
+ 'base': 'application/json',
+ 'type': MEDIA_TYPE_JSON % 'v3'
+ }
+ ]
+ }
+
+ return versions
+
+ def get_versions(self, context):
+
+ req_mime_type = v3_mime_type_best_match(context)
+ if req_mime_type == MimeTypes.JSON_HOME:
+ v3_json_home = request_v3_json_home('/v3')
+ return wsgi.render_response(
+ body=v3_json_home,
+ headers=(('Content-Type', MimeTypes.JSON_HOME),))
+
+ versions = self._get_versions_list(context)
+ return wsgi.render_response(status=(300, 'Multiple Choices'), body={
+ 'versions': {
+ 'values': versions.values()
+ }
+ })
+
+ def get_version_v2(self, context):
+ versions = self._get_versions_list(context)
+ if 'v2.0' in _VERSIONS:
+ return wsgi.render_response(body={
+ 'version': versions['v2.0']
+ })
+ else:
+ raise exception.VersionNotFound(version='v2.0')
+
+ def _get_json_home_v3(self):
+
+ def all_resources():
+ for router in self._routers:
+ for resource in router.v3_resources:
+ yield resource
+
+ return {
+ 'resources': dict(all_resources())
+ }
+
+ def get_version_v3(self, context):
+ versions = self._get_versions_list(context)
+ if 'v3' in _VERSIONS:
+ req_mime_type = v3_mime_type_best_match(context)
+
+ if req_mime_type == MimeTypes.JSON_HOME:
+ return wsgi.render_response(
+ body=self._get_json_home_v3(),
+ headers=(('Content-Type', MimeTypes.JSON_HOME),))
+
+ return wsgi.render_response(body={
+ 'version': versions['v3']
+ })
+ else:
+ raise exception.VersionNotFound(version='v3')