1 files changed, 51 insertions, 0 deletions
diff --git a/synapse/util/frozenutils.py b/synapse/util/frozenutils.py
new file mode 100644
index 00000000..9e10d37a
--- /dev/null
+++ b/synapse/util/frozenutils.py
@@ -0,0 +1,51 @@
+# -*- coding: utf-8 -*-
+# Copyright 2014, 2015 OpenMarket Ltd
+#
+# 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 frozendict import frozendict
+
+
+def freeze(o):
+    t = type(o)
+    if t is dict:
+        return frozendict({k: freeze(v) for k, v in o.items()})
+
+    if t is frozendict:
+        return o
+
+    if t is str or t is unicode:
+        return o
+
+    try:
+        return tuple([freeze(i) for i in o])
+    except TypeError:
+        pass
+
+    return o
+
+
+def unfreeze(o):
+    t = type(o)
+    if t is dict or t is frozendict:
+        return dict({k: unfreeze(v) for k, v in o.items()})
+
+    if t is str or t is unicode:
+        return o
+
+    try:
+        return [unfreeze(i) for i in o]
+    except TypeError:
+        pass
+
+    return o