magento2/app/code/Magento/ImportExport/Helper/Data.php

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */

namespace Magento\ImportExport\Helper;

/**
 * ImportExport data helper
 *
 * @api
 * @since 100.0.2
 */
class Data extends \Magento\Framework\App\Helper\AbstractHelper
{
    /**#@+
     * XML path for config data
     */
    const XML_PATH_EXPORT_LOCAL_VALID_PATH = 'general/file/importexport_local_valid_paths';

    const XML_PATH_BUNCH_SIZE = 'general/file/bunch_size';

    /**#@-*/

    /**#@-*/
    protected $_fileSize;

    /**
     * @param \Magento\Framework\App\Helper\Context $context
     * @param \Magento\Framework\File\Size $fileSize
     */
    public function __construct(
        \Magento\Framework\App\Helper\Context $context,
        \Magento\Framework\File\Size $fileSize
    ) {
        $this->_fileSize = $fileSize;
        parent::__construct(
            $context
        );
    }

    /**
     * Get maximum upload size message
     *
     * @return \Magento\Framework\Phrase
     */
    public function getMaxUploadSizeMessage()
    {
        $maxImageSize = $this->_fileSize->getMaxFileSizeInMb();
        if ($maxImageSize) {
            $message = __('Make sure your file isn\'t more than %1M.', $maxImageSize);
        } else {
            $message = __('We can\'t provide the upload settings right now.');
        }
        return $message;
    }

    /**
     * Get valid path masks to files for importing/exporting
     *
     * @return string[]
     */
    public function getLocalValidPaths()
    {
        $paths = $this->scopeConfig->getValue(
            self::XML_PATH_EXPORT_LOCAL_VALID_PATH,
            \Magento\Store\Model\ScopeInterface::SCOPE_STORE
        );
        return $paths;
    }

    /**
     * Retrieve size of bunch (how many entities should be involved in one import iteration)
     *
     * @return int
     */
    public function getBunchSize()
    {
        return (int)$this->scopeConfig->getValue(
            self::XML_PATH_BUNCH_SIZE,
            \Magento\Store\Model\ScopeInterface::SCOPE_STORE
        );
    }
}