graphQl-352: is email available

app/code/Magento/CustomerGraphQl/Model/Resolver/IsEmailAvailable.php

@@ -0,0 +1,55 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\CustomerGraphQl\Model\Resolver;
+
+use Magento\Customer\Api\AccountManagementInterface;
+use Magento\Framework\GraphQl\Config\Element\Field;
+use Magento\Framework\GraphQl\Exception\GraphQlInputException;
+use Magento\Framework\GraphQl\Query\ResolverInterface;
+use Magento\Framework\GraphQl\Schema\Type\ResolveInfo;
+
+/**
+ * Is Customer Email Available
+ */
+class IsEmailAvailable implements ResolverInterface
+{
+    /**
+     * @var AccountManagementInterface
+     */
+    private $accountManagement;
+
+    /**
+     * @param AccountManagementInterface $accountManagement
+     */
+    public function __construct(
+        AccountManagementInterface $accountManagement
+    ) {
+        $this->accountManagement = $accountManagement;
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function resolve(
+        Field $field,
+        $context,
+        ResolveInfo $info,
+        array $value = null,
+        array $args = null
+    ) {
+        $email = $args['email'] ?? null;
+        if (!$email) {
+            throw new GraphQlInputException(__('"Email should be specified'));
+        }
+        $isEmailAvailable = $this->accountManagement->isEmailAvailable($email);
+
+        return [
+            'is_email_available' => $isEmailAvailable
+        ];
+    }
+}

app/code/Magento/CustomerGraphQl/etc/schema.graphqls

@@ -3,6 +3,9 @@
 
 type Query {
     customer: Customer @resolver(class: "Magento\\CustomerGraphQl\\Model\\Resolver\\Customer") @doc(description: "The customer query returns information about a customer account")
+    isEmailAvailable (
+        email: String! @doc(description: "The new customer email")
+    ): IsEmailAvailableOutput @resolver(class: "Magento\\CustomerGraphQl\\Model\\Resolver\\IsEmailAvailable")
 }
 
 type Mutation {
@@ -126,6 +129,10 @@ type CustomerAddressAttribute {
      value: String  @doc(description: "Attribute value")
 }
 
+type IsEmailAvailableOutput {
+    is_email_available: Boolean @doc(description: "Is email availabel value")
+}
+
 enum CountryCodeEnum @doc(description: "The list of countries codes") {
     AF @doc(description: "Afghanistan")
     AX @doc(description: "Åland Islands")

dev/tests/api-functional/testsuite/Magento/GraphQl/Customer/IsEmailAvailableTest.php

@@ -0,0 +1,50 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\GraphQl\Customer;
+
+use Magento\TestFramework\TestCase\GraphQlAbstract;
+
+class IsEmailAvailableTest extends GraphQlAbstract
+{
+    /**
+     * @magentoApiDataFixture Magento/Customer/_files/customer.php
+     */
+    public function testEmailNotAvailable()
+    {
+        $query =
+            <<<QUERY
+{
+  isEmailAvailable(email: "[email protected]") {
+    is_email_available
+  }
+}
+QUERY;
+        $response = $this->graphQlQuery($query);
+
+        self::assertArrayHasKey('isEmailAvailable', $response);
+        self::assertArrayHasKey('is_email_available', $response['isEmailAvailable']);
+        self::assertFalse($response['isEmailAvailable']['is_email_available']);
+    }
+
+    public function testEmailAvailable()
+    {
+        $query =
+            <<<QUERY
+{
+  isEmailAvailable(email: "[email protected]") {
+    is_email_available
+  }
+}
+QUERY;
+        $response = $this->graphQlQuery($query);
+
+        self::assertArrayHasKey('isEmailAvailable', $response);
+        self::assertArrayHasKey('is_email_available', $response['isEmailAvailable']);
+        self::assertTrue($response['isEmailAvailable']['is_email_available']);
+    }
+}