Report.php

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<?php
namespace Magento\ImportExport\Helper;

use Magento\Framework\App\Filesystem\DirectoryList;
use Magento\ImportExport\Model\Import;

class Report extends \Magento\Framework\App\Helper\AbstractHelper
{
    protected $timeZone;

    protected $varDirectory;

    public function __construct(
        \Magento\Framework\App\Helper\Context $context,
        \Magento\Framework\Stdlib\DateTime\Timezone $timeZone,
        \Magento\Framework\Filesystem $filesystem
    ) {
        $this->timeZone = $timeZone;
        $this->varDirectory = $filesystem->getDirectoryWrite(DirectoryList::VAR_DIR);
        parent::__construct($context);
    }

    public function getExecutionTime($time)
    {
        $reportTime = $this->timeZone->date($time);
        $timeDiff = $reportTime->diff($this->timeZone->date());
        return $timeDiff->format('%H:%I:%S');
    }

    public function getSummaryStats(\Magento\ImportExport\Model\Import $import)
    {
        $message = __(
            'Created: %1, Updated: %2, Deleted: %3',
            $import->getCreatedItemsCount(),
            $import->getUpdatedItemsCount(),
            $import->getDeletedItemsCount()
        );
        return $message;
    }

    public function importFileExists($filename)
    {
        return $this->varDirectory->isFile($this->getFilePath($filename));
    }

    public function getReportOutput($filename)
    {
        return $this->varDirectory->readFile($this->getFilePath($filename));
    }

    public function getReportAbsolutePath($fileName)
    {
        return $this->varDirectory->getAbsolutePath(Import::IMPORT_HISTORY_DIR . $fileName);
    }

    public function getReportSize($filename)
    {
        return $this->varDirectory->stat($this->getFilePath($filename))['size'];
    }

    protected function getFilePath($filename)
    {
        if (preg_match('/\.\.(\\\|\/)/', $filename)) {
            throw new \InvalidArgumentException('Filename has not permitted symbols in it');
        }

        return $this->varDirectory->getRelativePath(Import::IMPORT_HISTORY_DIR . $filename);
    }

    public function getDelimiter()
    {
        return $this->_request->getParam(Import::FIELD_FIELD_SEPARATOR, ',');
    }
}