Request.php

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<?php
namespace Magento\Authorizenet\Model\Directpost;

use Magento\Authorizenet\Model\Request as AuthorizenetRequest;

class Request extends AuthorizenetRequest
{
    protected $_transKey = null;

    protected function _getTransactionKey()
    {
        return $this->_transKey;
    }

    protected function _setTransactionKey($transKey)
    {
        $this->_transKey = $transKey;
        return $this;
    }

    public function generateRequestSign(
        $merchantApiLoginId,
        $merchantTransactionKey,
        $amount,
        $currencyCode,
        $fpSequence,
        $fpTimestamp
    ) {
        return hash_hmac(
            "md5",
            $merchantApiLoginId . "^" . $fpSequence . "^" . $fpTimestamp . "^" . $amount . "^" . $currencyCode,
            $merchantTransactionKey
        );
    }

    public function setConstantData(\Magento\Authorizenet\Model\Directpost $paymentMethod)
    {
        $this->setXVersion('3.1')->setXDelimData('FALSE')->setXRelayResponse('TRUE');

        $this->setXTestRequest($paymentMethod->getConfigData('test') ? 'TRUE' : 'FALSE');

        $this->setXLogin($paymentMethod->getConfigData('login'))
            ->setXMethod(\Magento\Authorizenet\Model\Authorizenet::REQUEST_METHOD_CC)
            ->setXRelayUrl($paymentMethod->getRelayUrl());

        $this->_setTransactionKey($paymentMethod->getConfigData('trans_key'));
        return $this;
    }

    public function setDataFromOrder(
        \Magento\Sales\Model\Order $order,
        \Magento\Authorizenet\Model\Directpost $paymentMethod
    ) {
        $payment = $order->getPayment();

        $this->setXType($payment->getAnetTransType());
        $this->setXFpSequence($order->getQuoteId());
        $this->setXInvoiceNum($order->getIncrementId());
        $this->setXAmount($payment->getBaseAmountAuthorized());
        $this->setXCurrencyCode($order->getBaseCurrencyCode());
        $this->setXTax(
            sprintf('%.2F', $order->getBaseTaxAmount())
        )->setXFreight(
            sprintf('%.2F', $order->getBaseShippingAmount())
        );

        //need to use (string) because NULL values IE6-8 decodes as "null" in JSON in JavaScript,
        //but we need "" for null values.
        $billing = $order->getBillingAddress();
        if (!empty($billing)) {
            $this->setXFirstName((string)$billing->getFirstname())
                ->setXLastName((string)$billing->getLastname())
                ->setXCompany((string)$billing->getCompany())
                ->setXAddress((string)$billing->getStreetLine(1))
                ->setXCity((string)$billing->getCity())
                ->setXState((string)$billing->getRegion())
                ->setXZip((string)$billing->getPostcode())
                ->setXCountry((string)$billing->getCountryId())
                ->setXPhone((string)$billing->getTelephone())
                ->setXFax((string)$billing->getFax())
                ->setXCustId((string)$billing->getCustomerId())
                ->setXCustomerIp((string)$order->getRemoteIp())
                ->setXCustomerTaxId((string)$billing->getTaxId())
                ->setXEmail((string)$order->getCustomerEmail())
                ->setXEmailCustomer((string)$paymentMethod->getConfigData('email_customer'))
                ->setXMerchantEmail((string)$paymentMethod->getConfigData('merchant_email'));
        }

        $shipping = $order->getShippingAddress();
        if (!empty($shipping)) {
            $this->setXShipToFirstName(
                (string)$shipping->getFirstname()
            )->setXShipToLastName(
                (string)$shipping->getLastname()
            )->setXShipToCompany(
                (string)$shipping->getCompany()
            )->setXShipToAddress(
                (string)$shipping->getStreetLine(1)
            )->setXShipToCity(
                (string)$shipping->getCity()
            )->setXShipToState(
                (string)$shipping->getRegion()
            )->setXShipToZip(
                (string)$shipping->getPostcode()
            )->setXShipToCountry(
                (string)$shipping->getCountryId()
            );
        }

        $this->setXPoNum((string)$payment->getPoNumber());

        return $this;
    }

    public function signRequestData()
    {
        $fpTimestamp = time();
        $hash = $this->generateRequestSign(
            $this->getXLogin(),
            $this->_getTransactionKey(),
            $this->getXAmount(),
            $this->getXCurrencyCode(),
            $this->getXFpSequence(),
            $fpTimestamp
        );
        $this->setXFpTimestamp($fpTimestamp);
        $this->setXFpHash($hash);
        return $this;
    }
}