Shortcut.php

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<?php
namespace Magento\Paypal\Block\Bml;

use Magento\Catalog\Block as CatalogBlock;
use Magento\Paypal\Helper\Shortcut\ValidatorInterface;

class Shortcut extends \Magento\Framework\View\Element\Template implements CatalogBlock\ShortcutInterface
{
    protected $_shouldRender = true;

    private $_paymentMethodCode = '';

    private $_alias = '';

    private $_startAction = '';

    private $_paymentData;

    private $_mathRandom;

    private $_bmlMethodCode = '';

    const SHORTCUT_IMAGE = 'https://www.paypalobjects.com/webstatic/en_US/i/buttons/ppcredit-logo-medium.png';

    private $_shortcutValidator;

    public function __construct(
        \Magento\Framework\View\Element\Template\Context $context,
        \Magento\Payment\Helper\Data $paymentData,
        \Magento\Framework\Math\Random $mathRandom,
        ValidatorInterface $shortcutValidator,
        $paymentMethodCode,
        $startAction,
        $alias,
        $bmlMethodCode,
        $shortcutTemplate,
        array $data = []
    ) {
        $this->_paymentData = $paymentData;
        $this->_mathRandom = $mathRandom;
        $this->_shortcutValidator = $shortcutValidator;

        $this->_paymentMethodCode = $paymentMethodCode;
        $this->_startAction = $startAction;
        $this->_alias = $alias;
        $this->setTemplate($shortcutTemplate);
        $this->_bmlMethodCode = $bmlMethodCode;
        parent::__construct($context, $data);
    }

    protected function _beforeToHtml()
    {
        $result = parent::_beforeToHtml();
        $isInCatalog = $this->getIsInCatalogProduct();
        if (!$this->_shortcutValidator->validate($this->_paymentMethodCode, $isInCatalog)) {
            $this->_shouldRender = false;
            return $result;
        }

        $method = $this->_paymentData->getMethodInstance($this->_bmlMethodCode);
        if (!$method->isAvailable()) {
            $this->_shouldRender = false;
            return $result;
        }

        $this->setShortcutHtmlId($this->_mathRandom->getUniqueHash('ec_shortcut_bml_'))
            ->setCheckoutUrl($this->getUrl($this->_startAction))
            ->setImageUrl(self::SHORTCUT_IMAGE)
            ->setAdditionalLinkImage(
                [
                    'href' => 'https://www.securecheckout.billmelater.com/paycapture-content/'
                    . 'fetch?hash=AU826TU8&content=/bmlweb/ppwpsiw.html',
                    'src' => 'https://www.paypalobjects.com/webstatic/en_US/btn/btn_bml_text.png',
                ]
            );

        return $result;
    }

    protected function _toHtml()
    {
        if (!$this->_shouldRender) {
            return '';
        }
        return parent::_toHtml();
    }

    public function isOrPositionBefore()
    {
        return $this->getShowOrPosition() == CatalogBlock\ShortcutButtons::POSITION_BEFORE;
    }

    public function isOrPositionAfter()
    {
        return $this->getShowOrPosition() == CatalogBlock\ShortcutButtons::POSITION_AFTER;
    }

    public function getAlias()
    {
        return $this->_alias;
    }
}