Add first release that was presented at Magento Live 2019

.gitignore

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+.idea

Controller/Cart/Totals.php

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+<?php
+
+/**
+ * W3C Payment Request (https://www.w3.org/TR/payment-request/)
+ *
+ * Add the W3C payment request api to Magento 2
+ *
+ * @package     ImaginationMedia\PaymentRequest
+ * @author      Igor Ludgero Miura <[email protected]>
+ * @copyright   Copyright (c) 2019 Imagination Media (https://www.imaginationmedia.com/)
+ * @license     https://opensource.org/licenses/OSL-3.0.php Open Software License 3.0
+ */
+
+declare(strict_types=1);
+
+namespace ImaginationMedia\PaymentRequest\Controller\Cart;
+
+use ImaginationMedia\PaymentRequest\Model\Address;
+use Magento\Customer\Model\Session;
+use Magento\Framework\App\Action\Action;
+use Magento\Framework\App\Action\Context;
+use Magento\Framework\App\ResponseInterface;
+use Magento\Framework\Controller\Result\Json;
+use Magento\Framework\Controller\Result\JsonFactory;
+use Magento\Framework\Controller\ResultInterface;
+use Magento\Framework\Exception\NoSuchEntityException;
+use Magento\Quote\Api\CartRepositoryInterface;
+use Magento\Quote\Model\Quote;
+use Magento\Quote\Model\Quote\Address\Rate as ShippingRate;
+use Magento\Store\Model\StoreManagerInterface;
+
+class Totals extends Action
+{
+    /**
+     * @var StoreManagerInterface
+     */
+    protected $storeManager;
+
+    /**
+     * @var CartRepositoryInterface
+     */
+    protected $cartRepository;
+
+    /**
+     * @var ShippingRate
+     */
+    protected $shippingRate;
+
+    /**
+     * @var Session
+     */
+    protected $session;
+
+    /**
+     * @var JsonFactory
+     */
+    protected $jsonFactory;
+
+    /**
+     * @var Address
+     */
+    protected $address;
+
+    const REQUIRED_FIELDS = [
+        "quoteId",
+        "shippingAddress",
+        "shippingMethod"
+    ];
+
+    /**
+     * Totals constructor.
+     * @param Context $context
+     * @param StoreManagerInterface $storeManager
+     * @param CartRepositoryInterface $cartRepository
+     * @param ShippingRate $shippingRate
+     * @param Session $session
+     * @param JsonFactory $jsonFactory
+     * @param Address $address
+     */
+    public function __construct(
+        Context $context,
+        StoreManagerInterface $storeManager,
+        CartRepositoryInterface $cartRepository,
+        ShippingRate $shippingRate,
+        Session $session,
+        JsonFactory $jsonFactory,
+        Address $address
+    ) {
+        parent::__construct($context);
+        $this->storeManager = $storeManager;
+        $this->cartRepository = $cartRepository;
+        $this->shippingRate = $shippingRate;
+        $this->session = $session;
+        $this->jsonFactory = $jsonFactory;
+        $this->address = $address;
+    }
+
+    /**
+     * Get cart totals
+     * @return bool|ResponseInterface|Json|ResultInterface
+     * @throws NoSuchEntityException
+     */
+    public function execute()
+    {
+        $params = $this->getRequest()->getParams();
+        $error = "";
+        $totals = [];
+        $jsonResult = $this->jsonFactory->create();
+
+        /**
+         * Validate info
+         */
+        foreach (self::REQUIRED_FIELDS as $REQUIRED_FIELD) {
+            if (!isset($params[$REQUIRED_FIELD]) ||
+                in_array($params[$REQUIRED_FIELD], ["undefined", "null"])) {
+                $error = __("Not provided " . $REQUIRED_FIELD . " field.");
+            }
+        }
+
+        if ($error === "") {
+            $quoteId = (int)$params["quoteId"];
+            $store = $this->storeManager->getStore();
+            $cart = $this->cartRepository->get($quoteId);
+            $customerId = $this->session->isLoggedIn() ? (int)$this->session->getCustomerId() : 0;
+
+            /**
+             * Validate if there is an active quote
+             */
+            if (!$cart instanceof Quote || is_null($cart->getData("entity_id"))) {
+                $error = __("Invalid cart");
+            }
+
+            /**
+             * Check if cart is empty
+             */
+            if ((int)$cart->getItemsCount() === 0) {
+                $error = __("Empty cart");
+            }
+
+            $cart->setStore($store);
+            $cart->setCurrency();
+
+            /**
+             * Set shipping addreess
+             */
+            $magentoAddress = $this->address->convertAddressToMagentoAdress(
+                $params["shippingAddress"],
+                [],
+                $customerId
+            );
+            $cart->getShippingAddress()->addData($magentoAddress);
+
+            /**
+             * Set shipping method
+             */
+            $shippingMethod = $params["shippingMethod"]["carrier_code"] . "_" .
+                $params["shippingMethod"]["method_code"];
+            $this->shippingRate
+                ->setCode($shippingMethod)
+                ->getPrice();
+            $shippingAddress = $cart->getShippingAddress();
+            $shippingAddress->setCollectShippingRates(true)
+                ->collectShippingRates()
+                ->setShippingMethod($shippingMethod);
+            $cart->getShippingAddress()->addShippingRate($this->shippingRate);
+
+            /**
+             * Apply all the changes
+             */
+            $cart->collectTotals();
+            $cart->save();
+
+            $magentoTotals = $cart->getTotals();
+
+            foreach ($magentoTotals as $total) {
+                if ($total["value"] > 0) {
+                    $totals[$total["code"]] = $total["value"];
+                }
+            }
+
+            /**
+             * Add discounts by coupon code
+             */
+            $couponCode = (string)$cart->getCouponCode();
+            if ($couponCode !== "") {
+                $totals["discount"] = [
+                    "label" => sprintf(__("Discount (%s)"), $cart->getCouponCode()),
+                    "amount" => -($cart->getSubtotal() - $cart->getSubtotalWithDiscount())
+                ];
+            }
+        }
+
+        if ($error !== "") {
+            $totals = [];
+        }
+
+        $jsonResult->setData([
+            "error" => $error,
+            "totals" => $totals
+        ]);
+
+        return $jsonResult;
+    }
+}