Component.php

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<?php
namespace Magento\Paypal\Block\Express\InContext;

use Magento\Paypal\Model\Config;
use Magento\Paypal\Model\ConfigFactory;
use Magento\Framework\View\Element\Template;
use Magento\Framework\Locale\ResolverInterface;
use Magento\Framework\View\Element\Template\Context;

class Component extends Template
{
    const IS_BUTTON_CONTEXT_INDEX = 'is_button_context';

    private $localeResolver;

    private $config;

    public function __construct(
        Context $context,
        ResolverInterface $localeResolver,
        ConfigFactory $configFactory,
        array $data = []
    ) {
        parent::__construct($context, $data);
        $this->localeResolver = $localeResolver;
        $this->config = $configFactory->create();

        $this->config->setMethod(Config::METHOD_EXPRESS);
    }

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

        return parent::_toHtml();
    }

    private function isInContext()
    {
        return (bool)(int) $this->config->getValue('in_context');
    }

    public function getEnvironment()
    {
        return (int) $this->config->getValue('sandbox_flag') ? 'sandbox' : 'production';
    }

    public function getLocale()
    {
        return $this->localeResolver->getLocale();
    }

    public function getMerchantId()
    {
        return $this->config->getValue('merchant_id');
    }

    public function isButtonContext()
    {
        return (bool) $this->getData(self::IS_BUTTON_CONTEXT_INDEX);
    }
}