Add support for image show.

Add support for get details of specified image

Change-Id: Idea9298e7a04e8c507b29c7573c4814c74283741
Closes-bug: #1721448

zun/api/controllers/v1/images.py

@@ -30,6 +30,11 @@ from zun import objects
 LOG = logging.getLogger(__name__)
 
 
+def check_policy_on_image(image, action):
+    context = pecan.request.context
+    policy.enforce(context, action, image, action=action)
+
+
 class ImageCollection(collection.Collection):
     """API representation of a collection of images."""
 
@@ -69,6 +74,17 @@ class ImagesController(base.Controller):
                        action="image:get_all")
         return self._get_images_collection(**kwargs)
 
+    @pecan.expose('json')
+    @exception.wrap_pecan_controller_exception
+    def get_one(self, image_id):
+        """Retrieve information about the given image.
+
+        :param image_id: UUID of a image.
+        """
+        image = utils.get_image(image_id)
+        check_policy_on_image(image.as_dict(), "image:get_one")
+        return view.format_image(pecan.request.host_url, image)
+
     def _get_images_collection(self, **kwargs):
         context = pecan.request.context
         limit = api_utils.validate_limit(kwargs.get('limit'))

zun/api/controllers/v1/views/images_view.py

@@ -22,6 +22,7 @@ _basic_keys = (
     'repo',
     'tag',
     'size',
+    'project_id',
     'image_pull_policy'
 )
 

zun/common/policies/image.py

@@ -45,6 +45,17 @@ rules = [
             }
         ]
     ),
+    policy.DocumentedRuleDefault(
+        name=IMAGE % 'get_one',
+        check_str=base.RULE_ADMIN_OR_OWNER,
+        description='Retrieve the details of a specific image.',
+        operations=[
+            {
+                'path': '/v1/images/{image_id}',
+                'method': 'GET'
+            }
+        ]
+    ),
     # FIXME(lbragstad): This API call isn't actually listed in zun's API
     # reference:
     # https://developer.openstack.org/api-ref/application-container/

zun/common/utils.py

@@ -378,6 +378,15 @@ def get_container(container_ident):
     return container
 
 
+def get_image(image_id):
+    image = api_utils.get_resource('Image', image_id)
+    if not image:
+        pecan.abort(404, ('Not found; the image you requested '
+                          'does not exist.'))
+
+    return image
+
+
 def check_for_restart_policy(container_dict):
     """Check for restart policy input
 

zun/tests/unit/api/controllers/v1/test_images.py

@@ -111,6 +111,22 @@ class TestImageController(api_base.FunctionalTest):
         self.assertEqual(test_image['uuid'],
                          actual_images[0].get('uuid'))
 
+    @patch('zun.common.policy.enforce')
+    @patch('zun.objects.Image.get_by_uuid')
+    def test_get_one_image_by_uuid(self, mock_image_get_by_uuid, mock_policy):
+        mock_policy.return_value = True
+        test_image = utils.get_test_image()
+        test_image_obj = objects.Image(self.context, **test_image)
+        mock_image_get_by_uuid.return_value = test_image_obj
+
+        response = self.get('/v1/images/%s/' % test_image['uuid'])
+        mock_image_get_by_uuid.assert_called_once_with(
+            mock.ANY,
+            test_image['uuid'])
+        self.assertEqual(200, response.status_int)
+        self.assertEqual(test_image['uuid'],
+                         response.json['uuid'])
+
     @patch('zun.objects.Image.list')
     def test_get_all_images_with_pagination_marker(self, mock_image_list
                                                    ):

zun/tests/unit/common/test_utils.py

@@ -13,11 +13,14 @@
 #    under the License.
 
 import mock
+from mock import patch
+import pecan
 
 from zun.common import exception
 from zun.common import utils
 from zun.common.utils import check_container_id
 from zun.common.utils import translate_exception
+from zun import objects
 from zun.objects.container import Container
 from zun.tests import base
 from zun.tests.unit.db import utils as db_utils
@@ -175,3 +178,15 @@ class TestUtils(base.TestCase):
                        "spec": {"containers": [{"image": "test1"},
                                 {"environment": {"ROOT_PASSWORD": "foo0"}}]}})
             utils.check_capsule_template(params)
+
+    @patch('zun.objects.Image.get_by_uuid')
+    def test_get_image(self, mock_image_get_by_uuid):
+        test_image = db_utils.get_test_image()
+        test_image_obj = objects.Image(self.context, **test_image)
+        mock_image_get_by_uuid.return_value = test_image_obj
+        with mock.patch.object(pecan, 'request'):
+            image = utils.get_image(test_image['uuid'])
+            mock_image_get_by_uuid.assert_called_once_with(
+                mock.ANY,
+                test_image['uuid'])
+            self.assertEqual(test_image['uuid'], image.uuid)