AuthorizationLink.php

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

use Magento\Customer\Model\Context;
use Magento\Customer\Block\Account\SortLinkInterface;

class AuthorizationLink extends \Magento\Framework\View\Element\Html\Link implements SortLinkInterface
{
    protected $httpContext;

    protected $_customerUrl;

    protected $_postDataHelper;

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

    public function getHref()
    {
        return $this->isLoggedIn()
            ? $this->_customerUrl->getLogoutUrl()
            : $this->_customerUrl->getLoginUrl();
    }

    public function getLabel()
    {
        return $this->isLoggedIn() ? __('Sign Out') : __('Sign In');
    }

    public function getPostParams()
    {
        return $this->_postDataHelper->getPostData($this->getHref());
    }

    public function isLoggedIn()
    {
        return $this->httpContext->getValue(Context::CONTEXT_AUTH);
    }

    public function getSortOrder()
    {
        return $this->getData(self::SORT_ORDER);
    }
}