add escalator frame

JIRA:ESCALATOR-35

This patch will support escalator service,and there is not real command can use.
With this code, you can test with '/usr/bin/escalator-api' from command line.When
service is up, you can use "curl http://127.0.0.1:19393" for verify the service.

Change-Id: I5154328adf82ec70acb6e0ce12ef4b1701f7b710
Signed-off-by: Jing Sun <sun.jing22@zte.com.cn>

2 files changed, 137 insertions, 0 deletions

diff --git a/api/escalator/api/middleware/__init__.py b/api/escalator/api/middleware/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/api/escalator/api/middleware/__init__.py
diff --git a/api/escalator/api/middleware/context.py b/api/escalator/api/middleware/context.py
new file mode 100644
index 0000000..b921289
--- /dev/null
+++ b/api/escalator/api/middleware/context.py
@@ -0,0 +1,137 @@
+# Copyright 2016 OPNFV Foundation
+# 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.
+
+from oslo_serialization import jsonutils
+from oslo_config import cfg
+from oslo_log import log as logging
+import webob.exc
+
+from escalator.api import policy
+from escalator.common import wsgi
+import escalator.context
+from escalator import i18n
+
+_ = i18n._
+
+context_opts = [
+    cfg.BoolOpt('owner_is_tenant', default=True,
+                help=_('When true, this option sets the owner of an image '
+                       'to be the tenant. Otherwise, the owner of the '
+                       ' image will be the authenticated user issuing the '
+                       'request.')),
+    cfg.StrOpt('admin_role', default='admin',
+               help=_('Role used to identify an authenticated user as '
+                      'administrator.')),
+    cfg.BoolOpt('allow_anonymous_access', default=False,
+                help=_('Allow unauthenticated users to access the API with '
+                       'read-only privileges. This only applies when using '
+                       'ContextMiddleware.')),
+]
+
+CONF = cfg.CONF
+CONF.register_opts(context_opts)
+
+LOG = logging.getLogger(__name__)
+
+
+class BaseContextMiddleware(wsgi.Middleware):
+    def process_response(self, resp):
+        try:
+            request_id = resp.request.context.request_id
+        except AttributeError:
+            LOG.warn(_('Unable to retrieve request id from context'))
+        else:
+            resp.headers['x-openstack-request-id'] = 'req-%s' % request_id
+        return resp
+
+
+class ContextMiddleware(BaseContextMiddleware):
+    def __init__(self, app):
+        self.policy_enforcer = policy.Enforcer()
+        super(ContextMiddleware, self).__init__(app)
+
+    def process_request(self, req):
+        """Convert authentication information into a request context
+
+        Generate a escalator.context.RequestContext object from the available
+        authentication headers and store on the 'context' attribute
+        of the req object.
+
+        :param req: wsgi request object that will be given the context object
+        :raises webob.exc.HTTPUnauthorized: when value of the X-Identity-Status
+                                            header is not 'Confirmed' and
+                                            anonymous access is disallowed
+        """
+        if req.headers.get('X-Identity-Status') == 'Confirmed':
+            req.context = self._get_authenticated_context(req)
+        elif CONF.allow_anonymous_access:
+            req.context = self._get_anonymous_context()
+        else:
+            raise webob.exc.HTTPUnauthorized()
+
+    def _get_anonymous_context(self):
+        kwargs = {
+            'user': None,
+            'tenant': None,
+            'roles': [],
+            'is_admin': False,
+            'read_only': True,
+            'policy_enforcer': self.policy_enforcer,
+        }
+        return escalator.context.RequestContext(**kwargs)
+
+    def _get_authenticated_context(self, req):
+        # NOTE(bcwaldon): X-Roles is a csv string, but we need to parse
+        # it into a list to be useful
+        roles_header = req.headers.get('X-Roles', '')
+        roles = [r.strip().lower() for r in roles_header.split(',')]
+
+        # NOTE(bcwaldon): This header is deprecated in favor of X-Auth-Token
+        deprecated_token = req.headers.get('X-Storage-Token')
+
+        service_catalog = None
+        if req.headers.get('X-Service-Catalog') is not None:
+            try:
+                catalog_header = req.headers.get('X-Service-Catalog')
+                service_catalog = jsonutils.loads(catalog_header)
+            except ValueError:
+                raise webob.exc.HTTPInternalServerError(
+                    _('Invalid service catalog json.'))
+
+        kwargs = {
+            'user': req.headers.get('X-User-Id'),
+            'tenant': req.headers.get('X-Tenant-Id'),
+            'roles': roles,
+            'is_admin': CONF.admin_role.strip().lower() in roles,
+            'auth_token': req.headers.get('X-Auth-Token', deprecated_token),
+            'owner_is_tenant': CONF.owner_is_tenant,
+            'service_catalog': service_catalog,
+            'policy_enforcer': self.policy_enforcer,
+        }
+
+        return escalator.context.RequestContext(**kwargs)
+
+
+class UnauthenticatedContextMiddleware(BaseContextMiddleware):
+    def process_request(self, req):
+        """Create a context without an authorized user."""
+        kwargs = {
+            'user': None,
+            'tenant': None,
+            'roles': [],
+            'is_admin': True,
+        }
+
+        req.context = escalator.context.RequestContext(**kwargs)