Add new filter to abort/prevent notification based on notification or…

… post id/data #1723

modules/async-notifications/async-notifications.php

@@ -132,10 +132,18 @@ public function upgrade($previous_version)
          */
         public function send_notification($params)
         {
+            if (!is_array($params)) {
+                return;
+            }
+
             // Work the notification
             $workflow = Workflow::load_by_id((int)$params['workflow_id']);
             $workflow->event_args = $params['event_args'];
 
+            if (!apply_filters('publishpress_notifications_send_notification', true, $workflow)) {
+                return;
+            }
+
             do_action('publishpress_notifications_send_notifications_action', $workflow, true);
 
             do_action('publishpress_notifications_async_notification_sent', $params);
@@ -194,6 +202,10 @@ public function filterDebugInformation($debugInfo)
 
         public function schedule_notifications($workflow)
         {
+            if (!apply_filters('publishpress_notifications_schedule_notification', true, $workflow)) {
+                return;
+            }
+
             $scheduler = $this->get_service('notification_scheduler');
 
             $scheduler->scheduleNotification($workflow->workflow_post->ID, $workflow->event_args);