AC-1271: Add rate limiting for payment information endpoint and mutation

Author: arhiopterecs

app/code/Magento/GraphQl/Model/Backpressure/BackpressureFieldValidator.php

@@ -11,7 +11,6 @@
 use Magento\Framework\App\Backpressure\BackpressureExceededException;
 use Magento\Framework\App\BackpressureEnforcerInterface;
 use Magento\Framework\GraphQl\Config\Element\Field;
-use Magento\Framework\GraphQl\Exception\GraphQlInputException;
 use Magento\Framework\GraphQl\Query\Resolver\Argument\ValidatorInterface;
 
 /**
@@ -42,7 +41,10 @@ public function __construct(
     }
 
     /**
-     * @inheritDoc
+     * @param Field $field
+     * @param $args
+     * @return void
+     * @throws GraphQlTooManyRequestsException
      */
     public function validate(Field $field, $args): void
     {
@@ -54,9 +56,7 @@ public function validate(Field $field, $args): void
         try {
             $this->backpressureEnforcer->enforce($context);
         } catch (BackpressureExceededException $exception) {
-            throw new GraphQlInputException(
-                __('Something went wrong while processing the request. Try again later')
-            );
+            throw new GraphQlTooManyRequestsException(__('Too Many Requests'));
         }
     }
 }

app/code/Magento/GraphQl/Model/Backpressure/GraphQlTooManyRequestsException.php

@@ -0,0 +1,54 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\GraphQl\Model\Backpressure;
+
+use Exception;
+use GraphQL\Error\ClientAware;
+use Magento\Framework\Exception\LocalizedException;
+use Magento\Framework\Phrase;
+
+/**
+ * Exception to GraphQL that is thrown when the user submits too many requests
+ */
+class GraphQlTooManyRequestsException extends LocalizedException implements ClientAware
+{
+    const EXCEPTION_CATEGORY = 'graphql-too-many-requests';
+
+    /**
+     * @var boolean
+     */
+    private $isSafe;
+
+    /**
+     * @param Phrase $phrase
+     * @param Exception|null $cause
+     * @param $code
+     * @param $isSafe
+     */
+    public function __construct(Phrase $phrase, Exception $cause = null, $code = 0, $isSafe = true)
+    {
+        $this->isSafe = $isSafe;
+        parent::__construct($phrase, $cause, $code);
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function isClientSafe(): bool
+    {
+        return $this->isSafe;
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function getCategory(): string
+    {
+        return self::EXCEPTION_CATEGORY;
+    }
+}