Freeshipping.php

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<?php
namespace Magento\OfflineShipping\Model\Carrier;

use Magento\Quote\Model\Quote\Address\RateRequest;

class Freeshipping extends \Magento\Shipping\Model\Carrier\AbstractCarrier implements
    \Magento\Shipping\Model\Carrier\CarrierInterface
{
    protected $_code = 'freeshipping';

    protected $_isFixed = true;

    protected $_rateResultFactory;

    protected $_rateMethodFactory;

    public function __construct(
        \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig,
        \Magento\Quote\Model\Quote\Address\RateResult\ErrorFactory $rateErrorFactory,
        \Psr\Log\LoggerInterface $logger,
        \Magento\Shipping\Model\Rate\ResultFactory $rateResultFactory,
        \Magento\Quote\Model\Quote\Address\RateResult\MethodFactory $rateMethodFactory,
        array $data = []
    ) {
        $this->_rateResultFactory = $rateResultFactory;
        $this->_rateMethodFactory = $rateMethodFactory;
        parent::__construct($scopeConfig, $rateErrorFactory, $logger, $data);
    }

    public function collectRates(RateRequest $request)
    {
        if (!$this->getConfigFlag('active')) {
            return false;
        }

        $result = $this->_rateResultFactory->create();

        $this->_updateFreeMethodQuote($request);

        if ($request->getFreeShipping() || $request->getBaseSubtotalInclTax() >= $this->getConfigData(
            'free_shipping_subtotal'
        )
        ) {
            $method = $this->_rateMethodFactory->create();

            $method->setCarrier('freeshipping');
            $method->setCarrierTitle($this->getConfigData('title'));

            $method->setMethod('freeshipping');
            $method->setMethodTitle($this->getConfigData('name'));

            $method->setPrice('0.00');
            $method->setCost('0.00');

            $result->append($method);
        }

        return $result;
    }

    protected function _updateFreeMethodQuote($request)
    {
        $freeShipping = false;
        $items = $request->getAllItems();
        $c = count($items);
        for ($i = 0; $i < $c; $i++) {
            if ($items[$i]->getProduct() instanceof \Magento\Catalog\Model\Product) {
                if ($items[$i]->getFreeShipping()) {
                    $freeShipping = true;
                } else {
                    return;
                }
            }
        }
        if ($freeShipping) {
            $request->setFreeShipping(true);
        }
    }

    public function getAllowedMethods()
    {
        return ['freeshipping' => $this->getConfigData('name')];
    }
}