FileFactory.php

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<?php
namespace Magento\Backend\App\Response\Http;

use Magento\Framework\App\Filesystem\DirectoryList;

class FileFactory extends \Magento\Framework\App\Response\Http\FileFactory
{
    protected $_auth;

    protected $_backendUrl;

    protected $_response;

    protected $_session;

    protected $_flag;

    protected $_helper;

    public function __construct(
        \Magento\Framework\App\ResponseInterface $response,
        \Magento\Framework\Filesystem $filesystem,
        \Magento\Backend\Model\Auth $auth,
        \Magento\Backend\Model\UrlInterface $backendUrl,
        \Magento\Backend\Model\Session $session,
        \Magento\Framework\App\ActionFlag $flag,
        \Magento\Backend\Helper\Data $helper
    ) {
        $this->_auth = $auth;
        $this->_backendUrl = $backendUrl;
        $this->_session = $session;
        $this->_flag = $flag;
        $this->_helper = $helper;
        parent::__construct($response, $filesystem);
    }

    protected function _redirect($path, $arguments = [])
    {
        $this->_session->setIsUrlNotice(
            $this->_flag->get('', \Magento\Backend\App\AbstractAction::FLAG_IS_URLS_CHECKED)
        );
        $this->_response->setRedirect($this->_helper->getUrl($path, $arguments));
        return $this->_response;
    }

    public function create(
        $fileName,
        $content,
        $baseDir = DirectoryList::ROOT,
        $contentType = 'application/octet-stream',
        $contentLength = null
    ) {
        if ($this->_auth->getAuthStorage()->isFirstPageAfterLogin()) {
            return $this->_redirect($this->_backendUrl->getStartupPageUrl());
        }
        return parent::create($fileName, $content, $baseDir, $contentType, $contentLength);
    }
}