SetCanApplyMsrpObserver.php

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<?php
namespace Magento\Msrp\Observer\Frontend\Quote;

use Magento\Framework\Event\ObserverInterface;

class SetCanApplyMsrpObserver implements ObserverInterface
{
    protected $config;

    protected $canApplyMsrp;

    protected $msrp;

    public function __construct(
        \Magento\Msrp\Model\Config $config,
        \Magento\Msrp\Model\Quote\Address\CanApplyMsrp $canApplyMsrp,
        \Magento\Msrp\Model\Quote\Msrp $msrp
    ) {
        $this->config = $config;
        $this->canApplyMsrp = $canApplyMsrp;
        $this->msrp = $msrp;
    }

    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        $quote = $observer->getEvent()->getQuote();

        $canApplyMsrp = false;
        if ($this->config->isEnabled()) {
            foreach ($quote->getAllAddresses() as $address) {
                if ($this->canApplyMsrp->isCanApplyMsrp($address)) {
                    $canApplyMsrp = true;
                    break;
                }
            }
        }
        $this->msrp->setCanApplyMsrp($quote->getId(), $canApplyMsrp);
    }
}