incoming UNDO for follows now working

internal/federation/util.go

@@ -243,3 +243,23 @@ func (f *federator) GetTransportForUser(username string) (transport.Transport, e
 	}
 	return transport, nil
 }
+
+func sameActor(activityActor vocab.ActivityStreamsActorProperty, followActor vocab.ActivityStreamsActorProperty) bool {
+	if activityActor == nil || followActor == nil {
+		return false
+	}
+	for aIter := activityActor.Begin(); aIter != activityActor.End(); aIter = aIter.Next() {
+		for fIter := followActor.Begin(); fIter != followActor.End(); fIter = fIter.Next() {
+			if aIter.GetIRI() == nil {
+				return false
+			}
+			if fIter.GetIRI() == nil {
+				return false
+			}
+			if aIter.GetIRI().String() == fIter.GetIRI().String() {
+				return true
+			}
+		}
+	}
+	return false
+}