- Capture previous version of event pre-overwrite for use in notification hooks

- Use previous version of event in email hooks to determine added/deleted/updated email type

radicale/app/delete.py

@@ -24,7 +24,7 @@ from typing import Optional
 
 from radicale import httputils, storage, types, xmlutils
 from radicale.app.base import Access, ApplicationBase
-from radicale.hook import DeleteHookNotificationItem
+from radicale.hook import HookNotificationItem, HookNotificationItemTypes
 from radicale.log import logger
 
 
@@ -82,10 +82,12 @@ class ApplicationPartDelete(ApplicationBase):
                         return httputils.NOT_ALLOWED
                 for i in item.get_all():
                     hook_notification_item_list.append(
-                        DeleteHookNotificationItem(
-                            access.path,
-                            i.uid,
-                            old_content=item.serialize()  # type: ignore
+                        HookNotificationItem(
+                            notification_item_type=HookNotificationItemTypes.DELETE,
+                            path=access.path,
+                            uid=i.uid,
+                            old_content=item.serialize(),  # type: ignore
+                            new_content=None
                         )
                     )
                 xml_answer = xml_delete(base_prefix, path, item)
@@ -93,10 +95,12 @@ class ApplicationPartDelete(ApplicationBase):
                 assert item.collection is not None
                 assert item.href is not None
                 hook_notification_item_list.append(
-                    DeleteHookNotificationItem(
-                        access.path,
-                        item.uid,
-                        old_content=item.serialize()  # type: ignore
+                    HookNotificationItem(
+                        notification_item_type=HookNotificationItemTypes.DELETE,
+                        path=access.path,
+                        uid=item.uid,
+                        old_content=item.serialize(),  # type: ignore
+                        new_content=None,
                     )
                 )
                 xml_answer = xml_delete(