Links.php

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<?php
namespace Magento\Downloadable\Block\Catalog\Product;

use Magento\Catalog\Pricing\Price\FinalPrice;
use Magento\Downloadable\Model\Link;
use Magento\Downloadable\Pricing\Price\LinkPrice;
use Magento\Framework\Json\EncoderInterface;

class Links extends \Magento\Catalog\Block\Product\AbstractProduct
{
    protected $pricingHelper;

    protected $encoder;

    public function __construct(
        \Magento\Catalog\Block\Product\Context $context,
        \Magento\Framework\Pricing\Helper\Data $pricingHelper,
        EncoderInterface $encoder,
        array $data = []
    ) {
        $this->pricingHelper = $pricingHelper;
        $this->encoder = $encoder;
        parent::__construct($context, $data);
    }

    public function getLinksPurchasedSeparately()
    {
        return $this->getProduct()->getLinksPurchasedSeparately();
    }

    public function getLinkSelectionRequired()
    {
        return $this->getProduct()->getTypeInstance()->getLinkSelectionRequired($this->getProduct());
    }

    public function hasLinks()
    {
        return $this->getProduct()->getTypeInstance()->hasLinks($this->getProduct());
    }

    public function getLinks()
    {
        return $this->getProduct()->getTypeInstance()->getLinks($this->getProduct());
    }

    public function getCurrencyPrice($price)
    {
        $store = $this->getProduct()->getStore();
        return $this->pricingHelper->currencyByStore($price, $store, false);
    }

    public function getJsonConfig()
    {
        $finalPrice = $this->getProduct()->getPriceInfo()
            ->getPrice(FinalPrice::PRICE_CODE);

        $linksConfig = [];
        foreach ($this->getLinks() as $link) {
            $amount = $finalPrice->getCustomAmount($link->getPrice());
            $linksConfig[$link->getId()] = [
                'finalPrice' => $amount->getValue(),
                'basePrice' => $amount->getBaseAmount()
            ];
        }

        return $this->encoder->encode(['links' => $linksConfig]);
    }

    public function getLinkSampleUrl($link)
    {
        $store = $this->getProduct()->getStore();
        return $store->getUrl('downloadable/download/linkSample', ['link_id' => $link->getId()]);
    }

    public function getLinksTitle()
    {
        if ($this->getProduct()->getLinksTitle()) {
            return $this->getProduct()->getLinksTitle();
        }
        return $this->_scopeConfig->getValue(
            \Magento\Downloadable\Model\Link::XML_PATH_LINKS_TITLE,
            \Magento\Store\Model\ScopeInterface::SCOPE_STORE
        );
    }

    public function getIsOpenInNewWindow()
    {
        return $this->_scopeConfig->isSetFlag(
            \Magento\Downloadable\Model\Link::XML_PATH_TARGET_NEW_WINDOW,
            \Magento\Store\Model\ScopeInterface::SCOPE_STORE
        );
    }

    public function getIsLinkChecked($link)
    {
        $configValue = $this->getProduct()->getPreconfiguredValues()->getLinks();
        if (!$configValue || !is_array($configValue)) {
            return false;
        }

        return $configValue && in_array($link->getId(), $configValue);
    }

    public function getLinkCheckedValue($link)
    {
        return $this->getIsLinkChecked($link) ? 'checked' : '';
    }

    protected function getLinkAmount($link)
    {
        return $this->getPriceType()->getLinkAmount($link);
    }

    public function getLinkPrice(Link $link)
    {
        return $this->getLayout()->getBlock('product.price.render.default')->renderAmount(
            $this->getLinkAmount($link),
            $this->getPriceType(),
            $this->getProduct()
        );
    }

    protected function getPriceType()
    {
        return $this->getProduct()->getPriceInfo()->getPrice(LinkPrice::PRICE_CODE);
    }
}