Images.php

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

abstract class Images extends \Magento\Backend\App\Action
{
    const ADMIN_RESOURCE = 'Magento_Cms::media_gallery';

    protected $_coreRegistry = null;

    public function __construct(\Magento\Backend\App\Action\Context $context, \Magento\Framework\Registry $coreRegistry)
    {
        $this->_coreRegistry = $coreRegistry;
        parent::__construct($context);
    }

    protected function _initAction()
    {
        $this->getStorage();
        return $this;
    }

    public function getStorage()
    {
        if (!$this->_coreRegistry->registry('storage')) {
            $storage = $this->_objectManager->create(\Magento\Cms\Model\Wysiwyg\Images\Storage::class);
            $this->_coreRegistry->register('storage', $storage);
        }
        return $this->_coreRegistry->registry('storage');
    }
}