initial version

Change-Id: I699e0ab082657880998d8618fe29eb7f56c6c661

watcher/api/middleware/auth_token.py

@@ -0,0 +1,61 @@
+# -*- encoding: utf-8 -*-
+#
+# 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 re
+
+from keystonemiddleware import auth_token
+
+from watcher.common import exception
+from watcher.common.i18n import _
+from watcher.common import utils
+from watcher.openstack.common import log
+
+LOG = log.getLogger(__name__)
+
+
+class AuthTokenMiddleware(auth_token.AuthProtocol):
+    """A wrapper on Keystone auth_token middleware.
+
+    Does not perform verification of authentication tokens
+    for public routes in the API.
+
+    """
+    def __init__(self, app, conf, public_api_routes=[]):
+        route_pattern_tpl = '%s(\.json|\.xml)?$'
+
+        try:
+            self.public_api_routes = [re.compile(route_pattern_tpl % route_tpl)
+                                      for route_tpl in public_api_routes]
+        except re.error as e:
+            msg = _('Cannot compile public API routes: %s') % e
+
+            LOG.error(msg)
+            raise exception.ConfigInvalid(error_msg=msg)
+
+        super(AuthTokenMiddleware, self).__init__(app, conf)
+
+    def __call__(self, env, start_response):
+        path = utils.safe_rstrip(env.get('PATH_INFO'), '/')
+
+        # The information whether the API call is being performed against the
+        # public API is required for some other components. Saving it to the
+        # WSGI environment is reasonable thereby.
+        env['is_public_api'] = any(map(lambda pattern: re.match(pattern, path),
+                                       self.public_api_routes))
+
+        if env['is_public_api']:
+            return self._app(env, start_response)
+
+        return super(AuthTokenMiddleware, self).__call__(env, start_response)