Storage.php

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<?php
namespace Magento\MediaStorage\Helper\File;

class Storage extends \Magento\Framework\App\Helper\AbstractHelper
{
    protected $_currentStorage = null;

    protected $_internalStorageList = [\Magento\MediaStorage\Model\File\Storage::STORAGE_MEDIA_FILE_SYSTEM];

    protected $_coreFileStorageDb = null;

    protected $_storage;

    protected $_filesystemStorage;

    public function __construct(
        \Magento\Framework\App\Helper\Context $context,
        \Magento\MediaStorage\Helper\File\Storage\Database $coreFileStorageDb,
        \Magento\MediaStorage\Model\File\Storage $storage,
        \Magento\MediaStorage\Model\File\Storage\File $filesystemStorage
    ) {
        $this->_filesystemStorage = $filesystemStorage;
        $this->_coreFileStorageDb = $coreFileStorageDb;
        $this->_storage = $storage;
        parent::__construct($context);
    }

    public function getCurrentStorageCode()
    {
        if ($this->_currentStorage === null) {
            $this->_currentStorage = (int)$this->scopeConfig->getValue(
                \Magento\MediaStorage\Model\File\Storage::XML_PATH_STORAGE_MEDIA,
                'default'
            );
        }

        return $this->_currentStorage;
    }

    public function getStorageFileModel()
    {
        return $this->_filesystemStorage;
    }

    public function isInternalStorage($storage = null)
    {
        $storage = $storage !== null ? (int)$storage : $this->getCurrentStorageCode();

        return in_array($storage, $this->_internalStorageList);
    }

    public function getStorageModel($storage = null, $params = [])
    {
        return $this->_storage->getStorageModel($storage, $params);
    }

    public function processStorageFile($filename)
    {
        if ($this->isInternalStorage()) {
            return false;
        }

        $dbHelper = $this->_coreFileStorageDb;

        $relativePath = $dbHelper->getMediaRelativePath($filename);
        $file = $this->getStorageModel()->loadByFilename($relativePath);

        if (!$file->getId()) {
            return false;
        }

        return $this->saveFileToFileSystem($file);
    }

    public function saveFileToFileSystem($file)
    {
        return $this->getStorageFileModel()->saveFile($file, true);
    }
}