clone cms with menus, make menus standalone app

cms/utils/encoder.py

@@ -0,0 +1,27 @@
+from django.core.serializers.json import DjangoJSONEncoder
+from django.utils.encoding import force_str
+from django.utils.functional import Promise
+from django.utils.html import conditional_escape
+
+
+class SafeJSONEncoder(DjangoJSONEncoder):
+    def _recursive_escape(self, o, esc=conditional_escape):
+        if isinstance(o, dict):
+            return type(o)((esc(k), self._recursive_escape(v)) for (k, v) in dict.items(o))
+        if isinstance(o, (list, tuple)):
+            return type(o)(self._recursive_escape(v) for v in o)
+        if isinstance(o, bool):
+            return o
+        try:
+            return type(o)(esc(o))
+        except (ValueError, TypeError):
+            return self.default(o)
+
+    def encode(self, o):
+        value = self._recursive_escape(o)
+        return super().encode(value)
+
+    def default(self, o):
+        if isinstance(o, Promise):
+            return force_str(o)
+        return super().default(o)