Collection.php

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<?php
namespace Magento\Backup\Model\Fs;

use Magento\Framework\App\Filesystem\DirectoryList;

class Collection extends \Magento\Framework\Data\Collection\Filesystem
{
    protected $_varDirectory;

    protected $_path = 'backups';

    protected $_backupData = null;

    protected $_backup = null;

    public function __construct(
        \Magento\Framework\Data\Collection\EntityFactory $entityFactory,
        \Magento\Backup\Helper\Data $backupData,
        \Magento\Framework\Filesystem $filesystem,
        \Magento\Backup\Model\Backup $backup
    ) {
        $this->_backupData = $backupData;
        parent::__construct($entityFactory);

        $this->_filesystem = $filesystem;
        $this->_backup = $backup;
        $this->_varDirectory = $filesystem->getDirectoryWrite(DirectoryList::VAR_DIR);

        $this->_hideBackupsForApache();

        // set collection specific params
        $extensions = $this->_backupData->getExtensions();

        foreach ($extensions as $value) {
            $extensions[] = '(' . preg_quote($value, '/') . ')';
        }
        $extensions = implode('|', $extensions);

        $this->_varDirectory->create($this->_path);
        $path = rtrim($this->_varDirectory->getAbsolutePath($this->_path), '/') . '/';
        $this->setOrder(
            'time',
            self::SORT_ORDER_DESC
        )->addTargetDir(
            $path
        )->setFilesFilter(
            '/^[a-z0-9\-\_]+\.' . $extensions . '$/'
        )->setCollectRecursively(
            false
        );
    }

    protected function _hideBackupsForApache()
    {
        $filename = '.htaccess';
        if (!$this->_varDirectory->isFile($filename)) {
            $this->_varDirectory->writeFile($filename, 'deny from all');
        }
    }

    protected function _generateRow($filename)
    {
        $row = parent::_generateRow($filename);
        foreach ($this->_backup->load(
            $row['basename'],
            $this->_varDirectory->getAbsolutePath($this->_path)
        )->getData() as $key => $value) {
            $row[$key] = $value;
        }
        $row['size'] = $this->_varDirectory->stat($this->_varDirectory->getRelativePath($filename))['size'];
        if (isset($row['display_name']) && $row['display_name'] == '') {
            $row['display_name'] = 'WebSetupWizard';
        }
        $row['id'] = $row['time'] . '_' . $row['type']
            . (isset($row['display_name']) ? '_' . $row['display_name'] : '');
        return $row;
    }
}