1 files changed, 13 insertions, 0 deletions

diff --git a/server/helpers/custom-validators/activitypub/undo.ts b/server/helpers/custom-validators/activitypub/undo.ts
new file mode 100644
index 000000000..a9a2a3a41
--- /dev/null
+++ b/server/helpers/custom-validators/activitypub/undo.ts
@@ -0,0 +1,13 @@
+import { isAccountFollowActivityValid } from './account'
+import { isBaseActivityValid } from './misc'
+
+function isUndoValid (activity: any) {
+  return isBaseActivityValid(activity, 'Undo') &&
+    (
+      isAccountFollowActivityValid(activity.object)
+    )
+}
+
+export {
+  isUndoValid
+}