initial version

Change-Id: I699e0ab082657880998d8618fe29eb7f56c6c661

watcher/api/controllers/v1/utils.py

@@ -0,0 +1,52 @@
+# Copyright 2013 Red Hat, Inc.
+# All Rights Reserved.
+#
+#    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 jsonpatch
+from oslo_config import cfg
+import wsme
+
+from watcher.common.i18n import _
+
+CONF = cfg.CONF
+
+
+JSONPATCH_EXCEPTIONS = (jsonpatch.JsonPatchException,
+                        jsonpatch.JsonPointerException,
+                        KeyError)
+
+
+def validate_limit(limit):
+    if limit is not None and limit <= 0:
+        raise wsme.exc.ClientSideError(_("Limit must be positive"))
+
+    return min(CONF.api.max_limit, limit) or CONF.api.max_limit
+
+
+def validate_sort_dir(sort_dir):
+    if sort_dir not in ['asc', 'desc']:
+        raise wsme.exc.ClientSideError(_("Invalid sort direction: %s. "
+                                         "Acceptable values are "
+                                         "'asc' or 'desc'") % sort_dir)
+    return sort_dir
+
+
+def apply_jsonpatch(doc, patch):
+    for p in patch:
+        if p['op'] == 'add' and p['path'].count('/') == 1:
+            if p['path'].lstrip('/') not in doc:
+                msg = _('Adding a new attribute (%s) to the root of '
+                        ' the resource is not allowed')
+                raise wsme.exc.ClientSideError(msg % p['path'])
+    return jsonpatch.apply_patch(doc, jsonpatch.JsonPatch(patch))