Next round of prep for keystone integration.

* adds middleware for authenticating ec2 signature with keystone
 * adds middleware for converting keystone response into request context
 * gives examples of alternative pipelines for keystone integration

Next steps:
 * provide default config with no keystone integration (perhaps setting every context to admin?)
 * write authmanager to keystone conversion code
 * add api extension to create and destroy access/secret keys
 * deprecate authmanager
 * rename project to tenant

nova/tests/test_api.py

@@ -32,6 +32,7 @@ from nova import context
 from nova import exception
 from nova import test
 from nova import wsgi
+from nova.api import auth
 from nova.api import ec2
 from nova.api.ec2 import apirequest
 from nova.api.ec2 import cloud
@@ -199,7 +200,7 @@ class ApiEc2TestCase(test.TestCase):
         # NOTE(vish): skipping the Authorizer
         roles = ['sysadmin', 'netadmin']
         ctxt = context.RequestContext('fake', 'fake', roles=roles)
-        self.app = wsgi.InjectContext(ctxt,
+        self.app = auth.InjectContext(ctxt,
                 ec2.Requestify(ec2.Authorizer(ec2.Executor()),
                                'nova.api.ec2.cloud.CloudController'))
 

nova/wsgi.py

@@ -271,18 +271,6 @@ class Middleware(Application):
         return self.process_response(response)
 
 
-class InjectContext(Middleware):
-    """Add a 'nova.context' to WSGI environ."""
-    def __init__(self, context, *args, **kwargs):
-        self.context = context
-        super(InjectContext, self).__init__(*args, **kwargs)
-
-    @webob.dec.wsgify(RequestClass=Request)
-    def __call__(self, req):
-        req.environ['nova.context'] = self.context
-        return self.application
-
-
 class Debug(Middleware):
     """Helper class for debugging a WSGI application.