upload.php

См. документацию.

<?
define("STOP_STATISTICS", true);
define("PUBLIC_AJAX_MODE", true);
define("NO_KEEP_STATISTIC", "Y");
define("NO_AGENT_STATISTIC","Y");
define("DisableEventsCheck", true);
 
require_once($_SERVER["DOCUMENT_ROOT"]."/bitrix/modules/main/include/prolog_admin_before.php");
if (isset($_REQUEST["action"]) && $_REQUEST["action"] == "uncloud")
{
    $loader = new \Bitrix\Main\UI\FileInputUnclouder();
    $loader
        ->setValue($_REQUEST["file"] ?? 0)
        ->setSignature($_REQUEST["signature"] ?? '')
        ->exec(
            $_REQUEST["mode"] ?? '',
            [
                "width" => $_REQUEST["width"] ?? 0,
                "height" => $_REQUEST["height"] ?? 0,
            ]
        )
    ;
}
else if (isset($_REQUEST["action"]) && $_REQUEST["action"] == "error")
{
    $errorCatcher = new \Bitrix\Main\UI\Uploader\ErrorCatcher();
    $errorCatcher->log($_REQUEST["path"], $_REQUEST["data"]);
}
else if ($_SERVER["REQUEST_METHOD"] == "GET")
{
    $uploader = new \Bitrix\Main\UI\Uploader\Uploader($_GET);
    $uploader->checkPost(false);
}
else
{
    $receiver = new \Bitrix\Main\UI\FileInputReceiver($_POST["signature"] ?? '');
    $receiver->exec();
}