Reduce duplication in federated auth APIs

The GET /v3/OS-FEDERATION/projects and GET /v3/OS-FEDERATION/domains
APIs were introduced to handle tokens from federated users, but now
that GET /v3/auth/projects and GET /v3/auth/domains know how to handle
federated tokens, they're just duplicate APIs.

In the past we deprecated these federated auth APIs, but they still
used separate code paths from GET /v3/auth/projects and GET
/v3/auth/domains. The two code paths are true duplication in that they
don't expect to differ over time and should provide the same user
experience.

Instead of running the risk that comes with two code paths that do the
same thing, we should consolidate them.

Conflicts:
  keystone/federation/controllers.py due to the fact that pre-Queens
  code used a different dependency framework. This was reworked in
  the Queens release, causing a conflict with this patch since it
  touches the same code.
  keystone/tests/unit/test_v3_auth.py due to a couple test with
  similar naming and placement within the same test module.

Co-Authored-By: Kristi Nikolla <kristi@nikolla.me>

Closes-Bug: 1779205
Change-Id: Ib906c42e1dd2c2408ccd2e256ffd876af02af3fe
(cherry picked from commit df5d75571ed274b2964ed52048768c6d9f24d138)

keystone/federation/controllers.py

@@ -447,13 +447,8 @@ class DomainV3(controller.V3Controller):
         :returns: list of accessible domains
 
         """
-        domains = self.assignment_api.list_domains_for_groups(
-            request.auth_context['group_ids'])
-        domains = domains + self.assignment_api.list_domains_for_user(
-            request.auth_context['user_id'])
-        # remove duplicates
-        domains = [dict(t) for t in set([tuple(d.items()) for d in domains])]
-        return DomainV3.wrap_collection(request.context_dict, domains)
+        controller = auth_controllers.Auth()
+        return controller.get_auth_domains(request)
 
 
 @dependency.requires('assignment_api', 'resource_api')
@@ -473,14 +468,8 @@ class ProjectAssignmentV3(controller.V3Controller):
         :returns: list of accessible projects
 
         """
-        projects = self.assignment_api.list_projects_for_groups(
-            request.auth_context['group_ids'])
-        projects = projects + self.assignment_api.list_projects_for_user(
-            request.auth_context['user_id'])
-        # remove duplicates
-        projects = [dict(t) for t in set([tuple(d.items()) for d in projects])]
-        return ProjectAssignmentV3.wrap_collection(request.context_dict,
-                                                   projects)
+        controller = auth_controllers.Auth()
+        return controller.get_auth_projects(request)
 
 
 @dependency.requires('federation_api')

keystone/tests/unit/test_v3_auth.py

@@ -5090,6 +5090,59 @@ class TestAuthSpecificData(test_v3.RestfulTestCase):
         self.assertThat(r.json['domains'], matchers.HasLength(1))
         self.assertValidDomainListResponse(r)
 
+    def test_get_projects_matches_federated_get_projects(self):
+        # create at least one addition project to make sure it doesn't end up
+        # in the response, since the user doesn't have any authorization on it
+        ref = unit.new_project_ref(domain_id=CONF.identity.default_domain_id)
+        r = self.post('/projects', body={'project': ref})
+        unauthorized_project_id = r.json['project']['id']
+
+        r = self.get('/auth/projects', expected_status=http_client.OK)
+        self.assertThat(r.json['projects'], matchers.HasLength(1))
+        for project in r.json['projects']:
+            self.assertNotEqual(unauthorized_project_id, project['id'])
+
+        expected_project_id = r.json['projects'][0]['id']
+
+        # call GET /v3/OS-FEDERATION/projects
+        r = self.get('/OS-FEDERATION/projects', expected_status=http_client.OK)
+
+        # make sure the response is the same
+        self.assertThat(r.json['projects'], matchers.HasLength(1))
+        for project in r.json['projects']:
+            self.assertEqual(expected_project_id, project['id'])
+
+    def test_get_domains_matches_federated_get_domains(self):
+        # create at least one addition domain to make sure it doesn't end up
+        # in the response, since the user doesn't have any authorization on it
+        ref = unit.new_domain_ref()
+        r = self.post('/domains', body={'domain': ref})
+        unauthorized_domain_id = r.json['domain']['id']
+
+        ref = unit.new_domain_ref()
+        r = self.post('/domains', body={'domain': ref})
+        authorized_domain_id = r.json['domain']['id']
+
+        path = '/domains/%(domain_id)s/users/%(user_id)s/roles/%(role_id)s' % {
+            'domain_id': authorized_domain_id,
+            'user_id': self.user_id,
+            'role_id': self.role_id
+        }
+        self.put(path, expected_status=http_client.NO_CONTENT)
+
+        r = self.get('/auth/domains', expected_status=http_client.OK)
+        self.assertThat(r.json['domains'], matchers.HasLength(1))
+        self.assertEqual(authorized_domain_id, r.json['domains'][0]['id'])
+        self.assertNotEqual(unauthorized_domain_id, r.json['domains'][0]['id'])
+
+        # call GET /v3/OS-FEDERATION/domains
+        r = self.get('/OS-FEDERATION/domains', expected_status=http_client.OK)
+
+        # make sure the response is the same
+        self.assertThat(r.json['domains'], matchers.HasLength(1))
+        self.assertEqual(authorized_domain_id, r.json['domains'][0]['id'])
+        self.assertNotEqual(unauthorized_domain_id, r.json['domains'][0]['id'])
+
 
 class TestTrustAuthFernetTokenProvider(TrustAPIBehavior, TestTrustChain):
     def config_overrides(self):