Link.php

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<?php
namespace Magento\Wishlist\Block\Rss;

class Link extends \Magento\Framework\View\Element\Template
{
    protected $wishlistHelper;

    protected $rssUrlBuilder;

    protected $urlEncoder;

    public function __construct(
        \Magento\Framework\View\Element\Template\Context $context,
        \Magento\Wishlist\Helper\Data $wishlistHelper,
        \Magento\Framework\App\Rss\UrlBuilderInterface $rssUrlBuilder,
        \Magento\Framework\Url\EncoderInterface $urlEncoder,
        array $data = []
    ) {
        parent::__construct($context, $data);
        $this->wishlistHelper = $wishlistHelper;
        $this->rssUrlBuilder = $rssUrlBuilder;
        $this->urlEncoder = $urlEncoder;
    }

    public function getLink()
    {
        return $this->rssUrlBuilder->getUrl($this->getLinkParams());
    }

    public function isRssAllowed()
    {
        return $this->_scopeConfig->isSetFlag(
            'rss/wishlist/active',
            \Magento\Store\Model\ScopeInterface::SCOPE_STORE
        );
    }

    protected function getLinkParams()
    {
        $params = [];
        $wishlistId = $this->wishlistHelper->getWishlist()->getId();
        $customer = $this->wishlistHelper->getCustomer();
        if ($customer) {
            $key = $customer->getId() . ',' . $customer->getEmail();
            $params = [
                'type' => 'wishlist',
                'data' => $this->urlEncoder->encode($key),
                '_secure' => false
            ];
        }
        if ($wishlistId) {
            $params['wishlist_id'] = $wishlistId;
        }
        return $params;
    }
}