maileventhandler.php

<?php
namespace Bitrix\Sender;
 
use Bitrix\Main\EventManager;
use Bitrix\Main\Event;
use Bitrix\Main\EventResult;
 
class MailEventHandler
{
    private static $list = array();
 
    public static function handleEvent(Event $event)
    {
        $eventData = $event->getParameters();
        $eventData = $eventData[0];
 
        $eventName = $eventData['EVENT_NAME'];
        $fields = is_array($eventData['C_FIELDS']) ? $eventData['C_FIELDS'] : array();
 
        if(static::isPreventable($eventName, $fields))
        {
            // error
            $result = new EventResult(EventResult::ERROR);
        }
        else
        {
            // success
            $result = new EventResult(EventResult::SUCCESS);
        }
 
        return $result;
    }
 
    public static function prevent($eventName, array $filter)
    {
        if(empty(static::$list[$eventName]))
        {
            EventManager::getInstance()->addEventHandler('main', 'OnBeforeMailEventAdd', array(__CLASS__, 'handleEvent'), false, 1);
        }
 
        static::$list[$eventName][] = $filter;
    }
 
    public static function isPreventable($eventName, array $fields)
    {
        if(empty(static::$list[$eventName]))
            return false;
 
        $prevent = false;
 
        // check each filter
        foreach(static::$list[$eventName] as $filter)
        {
            foreach($filter as $key => $value)
            {
                $prevent = true;
                if(!isset($fields[$key]) || $fields[$key] != $value)
                {
                    $prevent = false;
                    break;
                }
            }
 
            if($prevent)
                break;
        }
 
        return $prevent;
    }
}