AutoSubscribeHandler.php

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<?php

namespace Elgg\Comments;

class AutoSubscribeHandler {
    
    public function __invoke(\Elgg\Event $event): void {
        $object = $event->getObject();
        if (!$object instanceof \ElggComment) {
            return;
        }
        
        $owner = $object->getOwnerEntity();
        $container = $object->getContainerEntity();
        if (!$owner instanceof \ElggUser || !$container instanceof \ElggEntity) {
            return;
        }
        
        if ($container->hasMutedNotifications($owner->guid)) {
            // user already said to not receive notifications, so don't force it
            return;
        }
        
        $comment_preferences = $owner->getNotificationSettings('create_comment');
        $enabled_methods = array_keys(array_filter($comment_preferences));
        if (empty($enabled_methods)) {
            return;
        }
        
        $container->addSubscription($owner->guid, $enabled_methods);
    }
}