Register default message policies in code

This commit uses the existing policy-in-code module to move all
default policies for messages into code. This commit also adds
helpful documetation about each API those policies protect, which
will be generated in sample policy files.

bp policy-and-docs-in-code

Change-Id: Id60872e1e2fc89b658cc16f3212d71733b4537bd

etc/policy.json.sample

@@ -1,12 +1,6 @@
 {
     "default": "rule:admin_or_owner",
 
-    "messages:get_all": "",
-    "messages:create": "",
-    "messages:get": "",
-    "messages:delete": "",
-    "messages:delete_all": "",
-
     "claims:get_all": "",
     "claims:create": "",
     "claims:get": "",

zaqar/common/policies/__init__.py

@@ -13,11 +13,13 @@
 import itertools
 
 from zaqar.common.policies import base
+from zaqar.common.policies import messages
 from zaqar.common.policies import queues
 
 
 def list_rules():
     return itertools.chain(
         base.list_rules(),
+        messages.list_rules(),
         queues.list_rules()
     )

zaqar/common/policies/messages.py

@@ -0,0 +1,80 @@
+# 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_policy import policy
+
+from zaqar.common.policies import base
+
+MESSAGES = 'messages:%s'
+
+
+rules = [
+    policy.DocumentedRuleDefault(
+        name=MESSAGES % 'get_all',
+        check_str=base.UNPROTECTED,
+        description='List all message in a message queue.',
+        operations=[
+            {
+                'path': '/v2/queues/{queue_name}/messages',
+                'method': 'GET'
+            }
+        ]
+    ),
+    policy.DocumentedRuleDefault(
+        name=MESSAGES % 'create',
+        check_str=base.UNPROTECTED,
+        description='Create a message in a message queue.',
+        operations=[
+            {
+                'path': '/v2/queues/{queue_name}/messages',
+                'method': 'POST'
+            }
+        ]
+    ),
+    policy.DocumentedRuleDefault(
+        name=MESSAGES % 'get',
+        check_str=base.UNPROTECTED,
+        description='Retrieve a specific message from a message queue.',
+        operations=[
+            {
+                'path': '/v2/queues/{queue_name}/messages/{message_id}',
+                'method': 'GET'
+            }
+        ]
+    ),
+    policy.DocumentedRuleDefault(
+        name=MESSAGES % 'delete',
+        check_str=base.UNPROTECTED,
+        description='Delete a specific message from a message queue.',
+        operations=[
+            {
+                'path': '/v2/queues/{queue_name}/messages/{message_id}',
+                'method': 'DELETE'
+            }
+        ]
+    ),
+    policy.DocumentedRuleDefault(
+        name=MESSAGES % 'delete_all',
+        check_str=base.UNPROTECTED,
+        description='Delete all messages from a message queue.',
+        operations=[
+            {
+                'path': '/v2/queues/{queue_name}/messages',
+                'method': 'DELETE'
+            }
+        ]
+    )
+]
+
+
+def list_rules():
+    return rules

zaqar/tests/etc/policy.json

@@ -1,12 +1,6 @@
 {
     "default": "rule:admin_or_owner",
 
-    "messages:get_all": "",
-    "messages:create": "",
-    "messages:get": "",
-    "messages:delete": "",
-    "messages:delete_all": "",
-
     "claims:get_all": "",
     "claims:create": "",
     "claims:get": "",