Version.php

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<?php
namespace Magento\Framework\App\PageCache;

class Version
{
    const COOKIE_NAME = 'private_content_version';

    const COOKIE_PERIOD = 315360000;

    protected $cookieManager;

    protected $request;

    protected $cookieMetadataFactory;

    public function __construct(
        \Magento\Framework\Stdlib\CookieManagerInterface $cookieManager,
        \Magento\Framework\Stdlib\Cookie\CookieMetadataFactory $cookieMetadataFactory,
        \Magento\Framework\App\Request\Http $request
    ) {
        $this->cookieManager = $cookieManager;
        $this->request = $request;
        $this->cookieMetadataFactory = $cookieMetadataFactory;
    }

    protected function generateValue()
    {
        return md5(rand() . time());
    }

    public function process()
    {
        if ($this->request->isPost()) {
            $publicCookieMetadata = $this->cookieMetadataFactory->createPublicCookieMetadata()
                ->setDuration(self::COOKIE_PERIOD)
                ->setPath('/')
                ->setSecure($this->request->isSecure())
                ->setHttpOnly(false);
            $this->cookieManager->setPublicCookie(self::COOKIE_NAME, $this->generateValue(), $publicCookieMetadata);
        }
    }
}