View.php

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<?php
namespace Magento\ProductAlert\Block\Product;

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

    protected $_helper;

    protected $coreHelper;

    public function __construct(
        \Magento\Framework\View\Element\Template\Context $context,
        \Magento\ProductAlert\Helper\Data $helper,
        \Magento\Framework\Registry $registry,
        \Magento\Framework\Data\Helper\PostHelper $coreHelper,
        array $data = []
    ) {
        parent::__construct($context, $data);
        $this->_registry = $registry;
        $this->_helper = $helper;
        $this->coreHelper = $coreHelper;
    }

    protected function getProduct()
    {
        $product = $this->_registry->registry('current_product');
        if ($product && $product->getId()) {
            return $product;
        }
        return false;
    }

    public function getPostAction()
    {
        return $this->coreHelper->getPostData($this->getSignupUrl());
    }
}