Admin: Add configuration setting 'notifications_extended_footer_message' to add optional (extra) footer in emails

Author: @juan-cortizas-ponte

main/inc/lib/api.lib.php

@@ -9480,6 +9480,16 @@ function api_mail_html(
         }
     }
 
+    $extendedFooterMessageConfig = api_get_configuration_value('notifications_extended_footer_message');
+    if ($extendedFooterMessageConfig) {
+        $platformLanguage = api_get_interface_language();
+        $extendedFooterMessage = api_get_configuration_value('notifications_extended_footer_message')[$platformLanguage];
+
+        if ($extendedFooterMessage) {
+            $message .= '<br /><hr><i>'.'<p>'.implode('<br/><br/>', $extendedFooterMessage['paragraphs']).'</p>';
+        }
+    }
+
     $mailView = new Template(null, false, false, false, false, false, false);
 
     $noReply = api_get_setting('noreply_email_address');

main/install/configuration.dist.php

@@ -2327,6 +2327,12 @@ INSERT INTO `extra_field` (`extra_field_type`, `field_type`, `variable`, `displa
 // Add the "remember password" link to the "subscription to session" confirmation email
 //$_configuration['email_template_subscription_to_session_confirmation_lost_password'] = false;
 
+// Add a custom extra footer for notificacions emails for a specific language, for example for
+// privacy policy notices. Multiple languages and paragraphs can be added.
+/*$_configuration['notifications_extended_footer_message'] = ['english' => ['paragraphs' => [
+    'Change or delete this paragraph or add another one'
+]]];*/
+
 // KEEP THIS AT THE END
 // -------- Custom DB changes
 // Add user activation by confirmation email