Refactor policy: Support precision control of power action

Change-Id: I7dfbbdc69873c72df4a0121cb6764905b669d2c9

etc/mogan/policy.json.sample

@@ -26,7 +26,11 @@
 "mogan:instance:delete": "rule:default"
 # Update Instance records
 "mogan:instance:update": "rule:default"
-# Change Instance power status
-"mogan:instance:set_power_state": "rule:default"
+# Start an instance
+"mogan:instance:set_power_state:on": "rule:default"
+# Stop an instance
+"mogan:instance:set_power_state:off": "rule:default"
+# Reboot an instance
+"mogan:instance:set_power_state:reboot": "rule:default"
 # Get Instance network information
 "mogan:instance:get_networks": "rule:default"

mogan/common/policy.py

@@ -91,14 +91,24 @@ instance_policies = [
     policy.RuleDefault('mogan:instance:update',
                        'rule:default',
                        description='Update Instance records'),
-    policy.RuleDefault('mogan:instance:set_power_state',
+    policy.RuleDefault('mogan:instance:set_power_state:on',
                        'rule:default',
-                       description='Change Instance power status'),
+                       description='Start an instance'),
+    policy.RuleDefault('mogan:instance:set_power_state:off',
+                       'rule:default',
+                       description='Stop an instance'),
+    policy.RuleDefault('mogan:instance:set_power_state:reboot',
+                       'rule:default',
+                       description='Reboot an instance'),
     policy.RuleDefault('mogan:instance:get_networks',
                        'rule:default',
                        description='Get Instance network information'),
 ]
 
+FUNC_PARAMS_INTERESTED = {
+    'power': ['target']
+}
+
 
 def list_policies():
     policies = (default_policies
@@ -168,6 +178,21 @@ def authorize(rule, target, creds, *args, **kwargs):
         raise exception.HTTPForbidden(resource=rule)
 
 
+def _add_action_extra(action, fn, *args, **kwargs):
+    func_name = fn.__name__
+    if func_name in FUNC_PARAMS_INTERESTED:
+        fn_args = fn.__dict__['_pecan']['argspec'][0][1:]
+        for param in FUNC_PARAMS_INTERESTED[func_name]:
+            if param in kwargs:
+                if kwargs[param]:
+                    action = '%s:%s' % (action, kwargs[param])
+            elif param in fn_args:
+                param_value = args[fn_args.index(param)]
+                if param_value:
+                    action = '%s:%s' % (action, param_value)
+    return action
+
+
 # NOTE(Shaohe Feng): This decorator MUST appear first (the outermost
 # decorator) on an API method for it to work correctly
 def authorize_wsgi(api_name, act=None, need_target=True):
@@ -187,7 +212,7 @@ def authorize_wsgi(api_name, act=None, need_target=True):
                    ...
     """
     def wraper(fn):
-        action = "%s:%s" % (api_name, (act or fn.func_name))
+        action = "%s:%s" % (api_name, (act or fn.__name__))
 
         # In this authorize method, we return a dict data when authorization
         # fails or exception comes out. Maybe we can consider to use
@@ -233,8 +258,9 @@ def authorize_wsgi(api_name, act=None, need_target=True):
                 # the credentials with itself.
                 target = {'project_id': context.tenant,
                           'user_id': context.user}
+            action_with_extra = _add_action_extra(action, fn, *args, **kwargs)
             try:
-                authorize(action, target, credentials)
+                authorize(action_with_extra, target, credentials)
             except Exception:
                 return return_error(403)
 

mogan/tests/unit/common/test_policy.py

@@ -0,0 +1,66 @@
+# 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 mock
+from oslo_context import context
+
+from mogan.common import policy
+from mogan.tests import base
+from mogan.tests.unit.objects import utils
+
+
+class TestAuthorizeWsgi(base.TestCase):
+    def setUp(self):
+        super(TestAuthorizeWsgi, self).setUp()
+        self.fake_controller = mock.MagicMock()
+        self.ctxt = context.RequestContext(
+            tenant='c18e8a1a870d4c08a0b51ced6e0b6459',
+            user='cdbf77d47f1d4d04ad9b7ff62b672467')
+        self.test_inst = utils.get_test_instance(self.ctxt)
+        self.fake_controller._get_resource.return_value = self.test_inst
+
+        def power(self, instance_uuid, target):
+            pass
+
+        power.__dict__['_pecan'] = {
+            'argspec': [['self', 'instance_uuid', 'target']]}
+        self.fake_power = power
+
+    @mock.patch('pecan.request')
+    def test_authorize_power_action_owner(self, mocked_pecan_request):
+        mocked_pecan_request.context = self.ctxt
+
+        policy.authorize_wsgi("mogan:instance", "set_power_state")(
+            self.fake_power)(self.fake_controller, 'fake_instance_id', 'off')
+
+    @mock.patch('pecan.request')
+    def test_authorize_power_action_admin(self, mocked_pecan_request):
+        mocked_pecan_request.context = context.get_admin_context()
+
+        policy.authorize_wsgi("mogan:instance", "set_power_state")(
+            self.fake_power)(self.fake_controller, 'fake_instance_id', 'off')
+
+    @mock.patch('pecan.response')
+    @mock.patch('pecan.request')
+    def test_authorize_power_action_failed(self, mocked_pecan_request,
+                                           mocked_pecan_response):
+        mocked_pecan_request.context = context.RequestContext(
+            tenant='non-exist-tenant',
+            user='non-exist-user')
+
+        data = policy.authorize_wsgi("mogan:instance", "set_power_state")(
+            self.fake_power)(self.fake_controller, 'fake_instance_id',
+                             'reboot')
+        self.assertEqual(403, mocked_pecan_response.status)
+        self.assertEqual('Access was denied to the following resource: '
+                         'mogan:instance:set_power_state:reboot',
+                         data['faultstring'])