Directive.php

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<?php
namespace Magento\Cms\Controller\Adminhtml\Wysiwyg;

use Magento\Backend\App\Action;

class Directive extends \Magento\Backend\App\Action
{

    const ADMIN_RESOURCE = 'Magento_Cms::media_gallery';

    protected $urlDecoder;

    protected $resultRawFactory;

    public function __construct(
        Action\Context $context,
        \Magento\Framework\Url\DecoderInterface $urlDecoder,
        \Magento\Framework\Controller\Result\RawFactory $resultRawFactory
    ) {
        parent::__construct($context);
        $this->urlDecoder = $urlDecoder;
        $this->resultRawFactory = $resultRawFactory;
    }

    public function execute()
    {
        $directive = $this->getRequest()->getParam('___directive');
        $directive = $this->urlDecoder->decode($directive);
        $imagePath = $this->_objectManager->create(\Magento\Cms\Model\Template\Filter::class)->filter($directive);
        $image = $this->_objectManager->get(\Magento\Framework\Image\AdapterFactory::class)->create();
        $resultRaw = $this->resultRawFactory->create();
        try {
            $image->open($imagePath);
            $resultRaw->setHeader('Content-Type', $image->getMimeType());
            $resultRaw->setContents($image->getImage());
        } catch (\Exception $e) {
            $imagePath = $this->_objectManager->get(
                \Magento\Cms\Model\Wysiwyg\Config::class
            )->getSkinImagePlaceholderPath();
            $image->open($imagePath);
            $resultRaw->setHeader('Content-Type', $image->getMimeType());
            $resultRaw->setContents($image->getImage());
            $this->_objectManager->get(\Psr\Log\LoggerInterface::class)->critical($e);
        }
        return $resultRaw;
    }
}