From a897ae65109a3701f981503eb4fa71d0291cb746 Mon Sep 17 00:00:00 2001
From: Justin Freeman <justin@agileware.com.au>
Date: Sat, 2 Oct 2021 09:58:43 +1000
Subject: [PATCH] CIVICRM-1858 CiviCRM APIv3, Improve API Exception error
 message when trying to subscribe to a non-public mailing group

---
 api/v3/MailingEventSubscribe.php | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/api/v3/MailingEventSubscribe.php b/api/v3/MailingEventSubscribe.php
index 7046fe166e..8e64faa365 100644
--- a/api/v3/MailingEventSubscribe.php
+++ b/api/v3/MailingEventSubscribe.php
@@ -38,6 +38,10 @@ function civicrm_api3_mailing_event_subscribe_create($params) {
     throw new API_Exception('Invalid Group id');
   }
 
+  if (substr($group->visibility, 0, 6) != 'Public') {
+    throw new API_Exception('Group is not Public. Contact cannot be subscribed to this Group.');
+  }
+
   $subscribe = CRM_Mailing_Event_BAO_Subscribe::subscribe($group_id, $email, $contact_id);
 
   if ($subscribe !== NULL) {
-- 
2.25.1