Add test for HEAD queries on Swift tempurl MW

Last version of Swift tempurl MW allow HEAD request
even if PUT or GET are not allowed. This patch
tests that feature.
Related Swift commit: d18b6d8d5d6ca8c0adf3b98b488042c49394a072

This patch also provides some code refactoring to the
middleware.

Change-Id: I33a3f73cf61a0c044428f885154feccb93c672ac
diff --git a/tempest/api/object_storage/test_object_temp_url.py b/tempest/api/object_storage/test_object_temp_url.py
index 9d5a1c0..d0e5353 100644
--- a/tempest/api/object_storage/test_object_temp_url.py
+++ b/tempest/api/object_storage/test_object_temp_url.py
@@ -39,27 +39,36 @@
     def setUpClass(cls):
         super(ObjectTempUrlTest, cls).setUpClass()
 
-        # skip this test if CORS isn't enabled in the conf file.
+        # skip this test if TempUrl isn't enabled in the conf file.
         if not cls.tempurl_available:
             skip_msg = ("%s skipped as TempUrl middleware not available"
                         % cls.__name__)
             raise cls.skipException(skip_msg)
 
+        # create a container
         cls.container_name = data_utils.rand_name(name='TestContainer')
         cls.container_client.create_container(cls.container_name)
         cls.containers = [cls.container_name]
 
         # update account metadata
         cls.key = 'Meta'
+        cls.metadatas = []
         cls.metadata = {'Temp-URL-Key': cls.key}
+        cls.metadatas.append(cls.metadata)
         cls.account_client.create_account_metadata(metadata=cls.metadata)
-        cls.account_client_metadata, _ = \
-            cls.account_client.list_account_metadata()
+
+        # create an object
+        cls.object_name = data_utils.rand_name(name='ObjectTemp')
+        cls.content = data_utils.arbitrary_string(size=len(cls.object_name),
+                                                  base_text=cls.object_name)
+        cls.object_client.create_object(cls.container_name,
+                                        cls.object_name, cls.content)
 
     @classmethod
     def tearDownClass(cls):
-        resp, _ = cls.account_client.delete_account_metadata(
-            metadata=cls.metadata)
+        for metadata in cls.metadata:
+            cls.account_client.delete_account_metadata(
+                metadata=metadata)
 
         cls.delete_containers(cls.containers)
 
@@ -69,21 +78,16 @@
 
     def setUp(self):
         super(ObjectTempUrlTest, self).setUp()
+
         # make sure the metadata has been set
+        account_client_metadata, _ = \
+            self.account_client.list_account_metadata()
         self.assertIn('x-account-meta-temp-url-key',
-                      self.account_client_metadata)
-
+                      account_client_metadata)
         self.assertEqual(
-            self.account_client_metadata['x-account-meta-temp-url-key'],
+            account_client_metadata['x-account-meta-temp-url-key'],
             self.key)
 
-        # create object
-        self.object_name = data_utils.rand_name(name='ObjectTemp')
-        self.data = data_utils.arbitrary_string(size=len(self.object_name),
-                                                base_text=self.object_name)
-        self.object_client.create_object(self.container_name,
-                                         self.object_name, self.data)
-
     def _get_expiry_date(self, expiration_time=1000):
         return int(time.time() + expiration_time)
 
@@ -114,10 +118,10 @@
                                  expires, self.key)
 
         # trying to get object using temp url within expiry time
-        resp, body = self.object_client.get_object_using_temp_url(url)
+        resp, body = self.object_client.get(url)
         self.assertIn(int(resp['status']), HTTP_SUCCESS)
         self.assertHeaders(resp, 'Object', 'GET')
-        self.assertEqual(body, self.data)
+        self.assertEqual(body, self.content)
 
         # Testing a HEAD on this Temp URL
         resp, body = self.object_client.head(url)
@@ -129,23 +133,27 @@
         key2 = 'Meta2-'
         metadata = {'Temp-URL-Key-2': key2}
         self.account_client.create_account_metadata(metadata=metadata)
+        self.metadatas.append(metadata)
 
-        self.account_client_metadata, _ = \
+        # make sure the metadata has been set
+        account_client_metadata, _ = \
             self.account_client.list_account_metadata()
         self.assertIn('x-account-meta-temp-url-key-2',
-                      self.account_client_metadata)
+                      account_client_metadata)
+        self.assertEqual(
+            account_client_metadata['x-account-meta-temp-url-key-2'],
+            key2)
 
         expires = self._get_expiry_date()
         url = self._get_temp_url(self.container_name,
                                  self.object_name, "GET",
                                  expires, key2)
-        resp, body = self.object_client.get_object_using_temp_url(url)
+        resp, body = self.object_client.get(url)
         self.assertIn(int(resp['status']), HTTP_SUCCESS)
-        self.assertEqual(body, self.data)
+        self.assertEqual(body, self.content)
 
     @attr(type='gate')
     def test_put_object_using_temp_url(self):
-        # make sure the metadata has been set
         new_data = data_utils.arbitrary_string(
             size=len(self.object_name),
             base_text=data_utils.rand_name(name="random"))
@@ -156,9 +164,7 @@
                                  expires, self.key)
 
         # trying to put random data in the object using temp url
-        resp, body = self.object_client.put_object_using_temp_url(
-            url, new_data)
-
+        resp, body = self.object_client.put(url, new_data, None)
         self.assertIn(int(resp['status']), HTTP_SUCCESS)
         self.assertHeaders(resp, 'Object', 'PUT')
 
@@ -172,9 +178,23 @@
                                  self.object_name, "GET",
                                  expires, self.key)
 
-        _, body = self.object_client.get_object_using_temp_url(url)
+        _, body = self.object_client.get(url)
         self.assertEqual(body, new_data)
 
+    @attr(type='gate')
+    def test_head_object_using_temp_url(self):
+        expires = self._get_expiry_date()
+
+        # get a temp URL for the created object
+        url = self._get_temp_url(self.container_name,
+                                 self.object_name, "HEAD",
+                                 expires, self.key)
+
+        # Testing a HEAD on this Temp URL
+        resp, body = self.object_client.head(url)
+        self.assertIn(int(resp['status']), HTTP_SUCCESS)
+        self.assertHeaders(resp, 'Object', 'HEAD')
+
     @attr(type=['gate', 'negative'])
     def test_get_object_after_expiration_time(self):
 
@@ -188,5 +208,4 @@
         time.sleep(2)
 
         self.assertRaises(exceptions.Unauthorized,
-                          self.object_client.get_object_using_temp_url,
-                          url)
+                          self.object_client.get, url)
diff --git a/tempest/services/object_storage/object_client.py b/tempest/services/object_storage/object_client.py
index 9e0adff..5c86d1f 100644
--- a/tempest/services/object_storage/object_client.py
+++ b/tempest/services/object_storage/object_client.py
@@ -134,14 +134,6 @@
         resp, body = self.put(url, data, self.headers)
         return resp, body
 
-    def get_object_using_temp_url(self, url):
-        """Retrieve object's data using temp URL."""
-        return self.get(url)
-
-    def put_object_using_temp_url(self, url, data):
-        """Put data in an object using temp URL."""
-        return self.put(url, data, None)
-
 
 class ObjectClientCustomizedHeader(RestClient):