Register default image policies in code

This commit uses the existing policy-in-code module to move all
default policies for images 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: I019d6b6c975f796b4384e4d5b27a28b6da8478f4

etc/zun/policy.json

@@ -1,11 +1,6 @@
 {
     "default": "rule:admin_or_owner",
 
-    "image:pull": "rule:default",
-    "image:get_all": "rule:default",
-    "image:search": "rule:default",
-
-
     "zun-service:delete": "rule:admin_api",
     "zun-service:disable": "rule:admin_api",
     "zun-service:enable": "rule:admin_api",

zun/common/policies/__init__.py

@@ -14,10 +14,12 @@ import itertools
 
 from zun.common.policies import base
 from zun.common.policies import container
+from zun.common.policies import image
 
 
 def list_rules():
     return itertools.chain(
         base.list_rules(),
-        container.list_rules()
+        container.list_rules(),
+        image.list_rules()
     )

zun/common/policies/image.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.
+
+from oslo_policy import policy
+
+from zun.common.policies import base
+
+IMAGE = 'image:%s'
+
+rules = [
+    # FIXME(lbragstad): This API call isn't actually listed in zun's API
+    # reference:
+    # https://developer.openstack.org/api-ref/application-container/
+    policy.DocumentedRuleDefault(
+        name=IMAGE % 'pull',
+        check_str=base.RULE_ADMIN_OR_OWNER,
+        description='Pull an image.',
+        operations=[
+            {
+                'path': '/v1/images',
+                'method': 'POST'
+            }
+        ]
+    ),
+    # FIXME(lbragstad): This API call isn't actually listed in zun's API
+    # reference:
+    # https://developer.openstack.org/api-ref/application-container/
+    policy.DocumentedRuleDefault(
+        name=IMAGE % 'get_all',
+        check_str=base.RULE_ADMIN_OR_OWNER,
+        description='Print a list of available images.',
+        operations=[
+            {
+                'path': '/v1/images',
+                'method': 'GET'
+            }
+        ]
+    ),
+    # FIXME(lbragstad): This API call isn't actually listed in zun's API
+    # reference:
+    # https://developer.openstack.org/api-ref/application-container/
+    policy.DocumentedRuleDefault(
+        name=IMAGE % 'search',
+        check_str=base.RULE_ADMIN_OR_OWNER,
+        description='Search an image.',
+        operations=[
+            {
+                'path': '/v1/images/{image_ident}/search',
+                'method': 'GET'
+            }
+        ]
+    )
+]
+
+
+def list_rules():
+    return rules