[+] add function GetSubscriberByUser for the agenda-widget

handlers/events.go

@@ -100,3 +100,14 @@ func (h AgendaHandler) UpdateEvent(event storage.Event) (*storage.Event, error)
 
 	return &event, nil
 }
+
+func (h AgendaHandler) GetSubscriptionByUser(subscriber string) (results []storage.Subscription, err error) {
+	if subscriber == "" {
+		return nil, errors.New("missing subscriber")
+	}
+	results, err = h.storage.GetSubscriptionByUser(subscriber)
+	if err != nil {
+		return nil, err
+	}
+	return results, nil
+}