DeleteExpiredImages.php

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<?php
namespace Magento\Captcha\Cron;

use Magento\Framework\App\Filesystem\DirectoryList;

class DeleteExpiredImages
{
    protected $_helper;

    protected $_adminHelper;

    protected $_mediaDirectory;

    protected $_storeManager;

    public function __construct(
        \Magento\Captcha\Helper\Data $helper,
        \Magento\Captcha\Helper\Adminhtml\Data $adminHelper,
        \Magento\Framework\Filesystem $filesystem,
        \Magento\Store\Model\StoreManager $storeManager
    ) {
        $this->_helper = $helper;
        $this->_adminHelper = $adminHelper;
        $this->_mediaDirectory = $filesystem->getDirectoryWrite(DirectoryList::MEDIA);
        $this->_storeManager = $storeManager;
    }

    public function execute()
    {
        foreach ($this->_storeManager->getWebsites() as $website) {
            $this->_deleteExpiredImagesForWebsite($this->_helper, $website, $website->getDefaultStore());
        }
        $this->_deleteExpiredImagesForWebsite($this->_adminHelper);

        return $this;
    }

    protected function _deleteExpiredImagesForWebsite(
        \Magento\Captcha\Helper\Data $helper,
        \Magento\Store\Model\Website $website = null,
        \Magento\Store\Model\Store $store = null
    ) {
        $expire = time() - $helper->getConfig('timeout', $store) * 60;
        $imageDirectory = $this->_mediaDirectory->getRelativePath($helper->getImgDir($website));
        foreach ($this->_mediaDirectory->read($imageDirectory) as $filePath) {
            if ($this->_mediaDirectory->isFile($filePath)
                && pathinfo($filePath, PATHINFO_EXTENSION) == 'png'
                && $this->_mediaDirectory->stat($filePath)['mtime'] < $expire
            ) {
                $this->_mediaDirectory->delete($filePath);
            }
        }
    }
}