FileRecorder.php

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<?php
namespace Magento\Analytics\Model;

use Magento\Framework\App\Filesystem\DirectoryList;
use Magento\Framework\Filesystem;
use Magento\Framework\Filesystem\Directory\WriteInterface;

class FileRecorder
{
    private $fileInfoManager;

    private $fileInfoFactory;

    private $fileSubdirectoryPath = 'analytics/';

    private $encodedFileName = 'data.tgz';

    private $filesystem;

    public function __construct(
        FileInfoManager $fileInfoManager,
        FileInfoFactory $fileInfoFactory,
        Filesystem $filesystem
    ) {
        $this->fileInfoManager = $fileInfoManager;
        $this->fileInfoFactory = $fileInfoFactory;
        $this->filesystem = $filesystem;
    }

    public function recordNewFile(EncodedContext $encodedContext)
    {
        $directory = $this->filesystem->getDirectoryWrite(DirectoryList::MEDIA);

        $fileRelativePath = $this->getFileRelativePath();
        $directory->writeFile($fileRelativePath, $encodedContext->getContent());

        $fileInfo = $this->fileInfoManager->load();
        $this->registerFile($encodedContext, $fileRelativePath);
        $this->removeOldFile($fileInfo, $directory);

        return true;
    }

    private function getFileRelativePath()
    {
        return $this->fileSubdirectoryPath . hash('sha256', time())
            . '/' . $this->encodedFileName;
    }

    private function registerFile(EncodedContext $encodedContext, $fileRelativePath)
    {
        $newFileInfo = $this->fileInfoFactory->create(
            [
                'path' => $fileRelativePath,
                'initializationVector' => $encodedContext->getInitializationVector(),
            ]
        );
        $this->fileInfoManager->save($newFileInfo);

        return true;
    }

    private function removeOldFile(FileInfo $fileInfo, WriteInterface $directory)
    {
        if (!$fileInfo->getPath()) {
            return true;
        }

        $directory->delete($fileInfo->getPath());

        $directoryName = dirname($fileInfo->getPath());
        if ($directoryName !== '.') {
            $directory->delete($directoryName);
        }

        return true;
    }
}