interface and _interface moved to action handler

pype/ftrack/lib/ftrack_action_handler.py

@@ -94,6 +94,48 @@ class BaseAction(BaseHandler):
         '''
 
         return False
+
+    def _interface(self, session, entities, event):
+        interface = self.interface(session, entities, event)
+        if not interface:
+            return
+
+        if isinstance(interface, (tuple, list)):
+            return {"items": interface}
+
+        if isinstance(interface, dict):
+            if (
+                "items" in interface
+                or ("success" in interface and "message" in interface)
+            ):
+                return interface
+
+            raise ValueError((
+                "Invalid interface output expected key: \"items\" or keys:"
+                " \"success\" and \"message\". Got: \"{}\""
+            ).format(str(interface)))
+
+        raise ValueError(
+            "Invalid interface output type \"{}\"".format(
+                str(type(interface))
+            )
+        )
+
+    def interface(self, session, entities, event):
+        '''Return a interface if applicable or None
+
+        *session* is a `ftrack_api.Session` instance
+
+        *entities* is a list of tuples each containing the entity type and
+        the entity id. If the entity is a hierarchical you will always get the
+        entity type TypedContext, once retrieved through a get operation you
+        will have the "real" entity type ie. example Shot, Sequence
+        or Asset Build.
+
+        *event* the unmodified original event
+        '''
+        return None
+
     def _launch(self, event):
         entities = self._translate_event(event)
 

pype/ftrack/lib/ftrack_base_handler.py

@@ -318,34 +318,6 @@ class BaseHandler(object):
 
         return False
 
-    def _interface(self, *args):
-        interface = self.interface(*args)
-        if interface:
-            if (
-                'items' in interface or
-                ('success' in interface and 'message' in interface)
-            ):
-                return interface
-
-            return {
-                'items': interface
-            }
-
-    def interface(self, session, entities, event):
-        '''Return a interface if applicable or None
-
-        *session* is a `ftrack_api.Session` instance
-
-        *entities* is a list of tuples each containing the entity type and the entity id.
-        If the entity is a hierarchical you will always get the entity
-        type TypedContext, once retrieved through a get operation you
-        will have the "real" entity type ie. example Shot, Sequence
-        or Asset Build.
-
-        *event* the unmodified original event
-        '''
-        return None
-
     def _handle_result(self, session, result, entities, event):
         '''Validate the returned result from the action callback'''
         if isinstance(result, bool):