Send.php

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<?php
namespace Magento\SendFriend\Controller\Product;

use Magento\Framework\Controller\ResultFactory;

class Send extends \Magento\SendFriend\Controller\Product
{
    protected $catalogSession;

    public function __construct(
        \Magento\Framework\App\Action\Context $context,
        \Magento\Framework\Registry $coreRegistry,
        \Magento\Framework\Data\Form\FormKey\Validator $formKeyValidator,
        \Magento\SendFriend\Model\SendFriend $sendFriend,
        \Magento\Catalog\Api\ProductRepositoryInterface $productRepository,
        \Magento\Catalog\Model\Session $catalogSession
    ) {
        $this->catalogSession = $catalogSession;
        parent::__construct(
            $context,
            $coreRegistry,
            $formKeyValidator,
            $sendFriend,
            $productRepository
        );
    }

    public function execute()
    {
        $product = $this->_initProduct();

        if (!$product) {
            $resultForward = $this->resultFactory->create(ResultFactory::TYPE_FORWARD);
            $resultForward->forward('noroute');
            return $resultForward;
        }

        if ($this->sendFriend->getMaxSendsToFriend() && $this->sendFriend->isExceedLimit()) {
            $this->messageManager->addNotice(
                __('You can\'t send messages more than %1 times an hour.', $this->sendFriend->getMaxSendsToFriend())
            );
        }

        $resultPage = $this->resultFactory->create(ResultFactory::TYPE_PAGE);

        $this->_eventManager->dispatch('sendfriend_product', ['product' => $product]);
        $data = $this->catalogSession->getSendfriendFormData();
        if ($data) {
            $this->catalogSession->setSendfriendFormData(true);
            $block = $resultPage->getLayout()->getBlock('sendfriend.send');
            if ($block) {
                $block->setFormData($data);
            }
        }

        return $resultPage;
    }
}