ExportVarnishConfig.php

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<?php
namespace Magento\PageCache\Controller\Adminhtml\PageCache;

use Magento\Framework\App\Filesystem\DirectoryList;

class ExportVarnishConfig extends \Magento\Backend\App\Action
{
    const ADMIN_RESOURCE = 'Magento_Backend::system';

    protected $fileFactory;

    protected $config;

    public function __construct(
        \Magento\Backend\App\Action\Context $context,
        \Magento\Framework\App\Response\Http\FileFactory $fileFactory,
        \Magento\PageCache\Model\Config $config
    ) {
        parent::__construct($context);
        $this->config = $config;
        $this->fileFactory = $fileFactory;
    }

    public function execute()
    {
        $fileName = 'varnish.vcl';
        $varnishVersion = $this->getRequest()->getParam('varnish');
        switch ($varnishVersion) {
            case 5:
                $content = $this->config->getVclFile(\Magento\PageCache\Model\Config::VARNISH_5_CONFIGURATION_PATH);
                break;
            default:
                $content = $this->config->getVclFile(\Magento\PageCache\Model\Config::VARNISH_4_CONFIGURATION_PATH);
                break;
        }
        return $this->fileFactory->create($fileName, $content, DirectoryList::VAR_DIR);
    }
}