261 alert functionality

app/code/Magento/InventorySalesAlert/Api/ProductIsSalableInterface.php

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+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\InventorySalesAlert\Api;
+
+use Magento\Catalog\Api\Data\ProductInterface;
+use Magento\InventorySalesApi\Api\Data\SalesChannelInterface;
+
+/**
+ * Is product salable
+ *
+ * Used fully qualified namespaces in annotations for proper work of WebApi request parser
+ *
+ * @api
+ */
+interface ProductIsSalableInterface
+{
+    /**
+     * @param ProductInterface $product
+     * @param string           $websiteCode
+     * @param string           $salesChannel
+     *
+     * @return bool
+     */
+    public function isSalable(
+        ProductInterface $product,
+        string $websiteCode,
+        string $salesChannel = SalesChannelInterface::TYPE_WEBSITE
+    ): bool;
+}

app/code/Magento/InventorySalesAlert/Model/ProductIsSalable.php

@@ -0,0 +1,63 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\InventorySalesAlert\Model;
+
+use Magento\Catalog\Api\Data\ProductInterface;
+use Magento\InventorySalesAlert\Api\ProductIsSalableInterface;
+use Magento\InventorySales\Model\StockResolver;
+use Magento\InventoryApi\Api\IsProductInStockInterface;
+use Magento\Framework\App\ObjectManager;
+use Magento\InventorySalesApi\Api\Data\SalesChannelInterface;
+use Magento\Inventory\Model\IsProductInStock;
+
+class ProductIsSalable implements ProductIsSalableInterface
+{
+
+    /**
+     * @var \Magento\InventoryApi\Api\IsProductInStockInterface
+     */
+    private $stockItem;
+
+    /**
+     * @var \Magento\InventorySales\Model\StockResolver
+     */
+    private $stockResolver;
+
+    /**
+     * ProductIsSalable constructor.
+     *
+     * @param \Magento\InventorySales\Model\StockResolver         $stockResolver
+     * @param \Magento\InventoryApi\Api\IsProductInStockInterface $stockItem
+     */
+    public function __construct(
+        StockResolver $stockResolver = null,
+        IsProductInStockInterface $stockItem = null
+    ) {
+        $this->stockItem     = $stockItem ?: ObjectManager::getInstance()->get(IsProductInStock::class);
+        $this->stockResolver = $stockResolver ?: ObjectManager::getInstance()->get(StockResolver::class);
+    }
+
+
+    /**
+     * @param ProductInterface $product
+     *
+     * @return bool
+     */
+    public function isSalable(
+        ProductInterface $product,
+        string $websiteCode,
+        string $salesChannel = SalesChannelInterface::TYPE_WEBSITE
+    ): bool
+    {
+        $stock = $this->stockResolver->get($salesChannel, $websiteCode);
+        if ($stock->getId()) {
+            return $this->stockItem->execute($product->getSku(), (int) $stock->getStockId());
+        }
+        return false;
+    }
+}

app/code/Magento/InventorySalesAlert/composer.json

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+{
+    "name": "magento/module-inventory-sales-alert",
+    "description": "",
+    "require": {
+        "php": "7.0.2|7.0.4|~7.0.6|~7.1.0",
+        "magento/framework": "100.3.*",
+        "magento/module-backend": "100.0.*",
+        "magento/module-catalog": "100.0.*",
+        "magento/module-catalog-inventory": "100.0.*",
+        "magento/module-inventory": "100.0.*",
+        "magento/module-inventory-api": "100.0.*",
+        "magento/module-inventory-catalog": "100.0.*",
+        "magento/module-inventory-sales-api": "100.0.*",
+        "magento/module-store": "100.3.*",
+        "magento/module-ui": "100.3.*",
+        "magento/magento-composer-installer": "*"
+    },
+    "suggest": {
+
+    },
+    "type": "magento2-module",
+    "version": "0.1.0",
+    "license": [
+
+    ],
+    "autoload": {
+        "files": [
+            "registration.php"
+        ],
+        "psr-4": {
+            "Magento\\InventorySalesAlert\\": ""
+        }
+    },
+    "extra": {
+        "map": [
+            [
+                "*",
+                "Magento/InventorySalesAlert"
+            ]
+        ]
+    }
+}

app/code/Magento/InventorySalesAlert/etc/di.xml

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+<?xml version="1.0"?>
+<!--
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+-->
+<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
+    <preference for="Magento\InventorySalesAlert\Api\ProductIsSalableInterface" type="Magento\InventorySalesAlert\Model\ProductIsSalable"/>
+</config>

app/code/Magento/InventorySalesAlert/etc/module.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0"?>
+<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
+    <module name="Magento_InventorySalesAlert" setup_version="0.1.0">
+    </module>
+</config>

app/code/Magento/InventorySalesAlert/registration.php

@@ -0,0 +1,7 @@
+<?php
+
+\Magento\Framework\Component\ComponentRegistrar::register(
+    \Magento\Framework\Component\ComponentRegistrar::MODULE,
+    'Magento_InventorySalesAlert',
+    __DIR__
+);