Add roles to context

Roles are an important part of the user context. They typically don't
need to be serialized for RPC but they are needed for policy. Include
roles onto the context object and make sure it is loaded from the
auth_token middleware environment.

Related-Bug: #1537653
Change-Id: Ia575ba803a0fb70f39146bd75d381ed19414bd23

oslo_context/context.py

@@ -53,7 +53,7 @@ class RequestContext(object):
     def __init__(self, auth_token=None, user=None, tenant=None, domain=None,
                  user_domain=None, project_domain=None, is_admin=False,
                  read_only=False, show_deleted=False, request_id=None,
-                 resource_uuid=None, overwrite=True):
+                 resource_uuid=None, overwrite=True, roles=None):
         """Initialize the RequestContext
 
         :param overwrite: Set to False to ensure that the greenthread local
@@ -69,6 +69,7 @@ class RequestContext(object):
         self.read_only = read_only
         self.show_deleted = show_deleted
         self.resource_uuid = resource_uuid
+        self.roles = roles or []
         if not request_id:
             request_id = generate_request_id()
         self.request_id = request_id
@@ -99,6 +100,7 @@ class RequestContext(object):
                 'auth_token': self.auth_token,
                 'request_id': self.request_id,
                 'resource_uuid': self.resource_uuid,
+                'roles': self.roles,
                 'user_identity': user_idt}
 
     def get_logging_values(self):
@@ -143,6 +145,9 @@ class RequestContext(object):
         kwargs.setdefault('project_domain',
                           environ.get('HTTP_X_PROJECT_DOMAIN_ID'))
 
+        roles = environ.get('HTTP_X_ROLES')
+        kwargs.setdefault('roles', roles.split(',') if roles else [])
+
         return cls(**kwargs)
 
 

oslo_context/tests/test_context.py

@@ -135,12 +135,14 @@ class ContextTest(test_base.BaseTestCase):
         project_id = uuid.uuid4().hex
         user_domain_id = uuid.uuid4().hex
         project_domain_id = uuid.uuid4().hex
+        roles = [uuid.uuid4().hex, uuid.uuid4().hex, uuid.uuid4().hex]
 
         environ = {'HTTP_X_AUTH_TOKEN': auth_token,
                    'HTTP_X_USER_ID': user_id,
                    'HTTP_X_PROJECT_ID': project_id,
                    'HTTP_X_USER_DOMAIN_ID': user_domain_id,
-                   'HTTP_X_PROJECT_DOMAIN_ID': project_domain_id}
+                   'HTTP_X_PROJECT_DOMAIN_ID': project_domain_id,
+                   'HTTP_X_ROLES': ','.join(roles)}
 
         ctx = context.RequestContext.from_environ(environ)
 
@@ -149,6 +151,14 @@ class ContextTest(test_base.BaseTestCase):
         self.assertEqual(project_id, ctx.tenant)
         self.assertEqual(user_domain_id, ctx.user_domain)
         self.assertEqual(project_domain_id, ctx.project_domain)
+        self.assertEqual(roles, ctx.roles)
+
+    def test_from_environ_no_roles(self):
+        ctx = context.RequestContext.from_environ(environ={})
+        self.assertEqual([], ctx.roles)
+
+        ctx = context.RequestContext.from_environ(environ={'HTTP_X_ROLES': ''})
+        self.assertEqual([], ctx.roles)
 
     def test_from_function_and_args(self):
         ctx = context.RequestContext(user="user1")
@@ -214,6 +224,7 @@ class ContextTest(test_base.BaseTestCase):
         self.assertIn('request_id', d)
         self.assertIn('resource_uuid', d)
         self.assertIn('user_identity', d)
+        self.assertIn('roles', d)
 
         self.assertEqual(auth_token, d['auth_token'])
         self.assertEqual(tenant, d['tenant'])
@@ -228,6 +239,7 @@ class ContextTest(test_base.BaseTestCase):
         user_identity = "%s %s %s %s %s" % (user, tenant, domain,
                                             user_domain, project_domain)
         self.assertEqual(user_identity, d['user_identity'])
+        self.assertEqual([], d['roles'])
 
     def test_get_logging_values(self):
         auth_token = "token1"