RegisterLink.php

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<?php
namespace Magento\Customer\Block\Account;

use Magento\Customer\Model\Context;

class RegisterLink extends \Magento\Framework\View\Element\Html\Link
{
    protected $httpContext;

    protected $_registration;

    protected $_customerUrl;

    public function __construct(
        \Magento\Framework\View\Element\Template\Context $context,
        \Magento\Framework\App\Http\Context $httpContext,
        \Magento\Customer\Model\Registration $registration,
        \Magento\Customer\Model\Url $customerUrl,
        array $data = []
    ) {
        parent::__construct($context, $data);
        $this->httpContext = $httpContext;
        $this->_registration = $registration;
        $this->_customerUrl = $customerUrl;
    }

    public function getHref()
    {
        return $this->_customerUrl->getRegisterUrl();
    }

    protected function _toHtml()
    {
        if (!$this->_registration->isAllowed()
            || $this->httpContext->getValue(Context::CONTEXT_AUTH)
        ) {
            return '';
        }
        return parent::_toHtml();
    }
}