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Upload File : current_dir [ Writeable ] document_root [ Writeable ]

<?php
/**
 * @author Amasty Team
 * @copyright Copyright (c) Amasty (https://www.amasty.com)
 * @package Product Attachments Base for Magento 2
 */

namespace Amasty\ProductAttachment\Controller\Adminhtml\File;

use Amasty\ProductAttachment\Controller\Adminhtml\File;
use Amasty\ProductAttachment\Model\Icon\GetIconForFile;
use Amasty\ProductAttachment\Model\Icon\ResourceModel\Icon;
use Magento\Backend\App\Action;
use Magento\Framework\Controller\ResultFactory;
use Magento\Downloadable\Helper\Download as DownloadHelper;

class Checker extends File
{
    /**
     * @var DownloadHelper
     */
    private $downloadHelper;

    /**
     * @var Icon
     */
    private $iconResource;

    /**
     * @var GetIconForFile
     */
    private $getIconForFile;

    public function __construct(
        Action\Context $context,
        DownloadHelper $downloadHelper,
        Icon $iconResource,
        GetIconForFile $getIconForFile
    ) {
        parent::__construct($context);
        $this->downloadHelper = $downloadHelper;
        $this->iconResource = $iconResource;
        $this->getIconForFile = $getIconForFile;
    }

    public function execute()
    {
        /** @var \Magento\Framework\Controller\Result\Json $resultJson */
        $resultJson = $this->resultFactory->create(ResultFactory::TYPE_JSON);

        if ($url = $this->getRequest()->getParam('url')) {
            $this->downloadHelper->setResource($url, DownloadHelper::LINK_TYPE_URL);
            try {
                $fileName = trim($this->downloadHelper->getFilename(), '"');
                $file = [];
                /** @codingStandardsIgnoreStart */
                $file['filename'] = pathinfo($fileName, PATHINFO_FILENAME);
                $file['file_extension'] = pathinfo($fileName, PATHINFO_EXTENSION);
                /** @codingStandardsIgnoreEnd */
                $allowedExtensions = $this->iconResource->getAllowedExtensions();
                if (in_array($file['file_extension'], $allowedExtensions)) {
                    $file['previewUrl'] = $this->getIconForFile->byFileExtension($file['file_extension']) ?: false;
                    $jsonData = [
                        'status' => 'success',
                        'message' => __('Success'),
                        'file' => $file
                    ];
                } else {
                    $jsonData = ['status' => 'error', 'message' => 'Disallowed Extension'];
                }
            } catch (\Exception $e) {
                $jsonData = ['status' => 'error', 'message' => $e->getMessage()];
            }
        } else {
            $jsonData = ['status' => 'error', 'message' => __('Empty Url')];
        }

        return $resultJson->setData($jsonData);
    }
}