GraphQl-416: graphql-input provides to Customer as many errors as appeared instead of last one like on Magento Storefront

app/code/Magento/Catalog/Model/Product/Type/AbstractType.php

@@ -9,6 +9,7 @@
 use Magento\Catalog\Api\ProductRepositoryInterface;
 use Magento\Framework\App\Filesystem\DirectoryList;
 use Magento\Framework\Exception\LocalizedException;
+use Magento\Framework\Exception\InvalidOptionInput;
 
 /**
  * @api
@@ -572,6 +573,7 @@ public function getSpecifyOptionMessage()
      * @param string $processMode
      * @return array
      * @throws LocalizedException
+     * @throws InvalidOptionInput
      */
     protected function _prepareOptions(\Magento\Framework\DataObject $buyRequest, $product, $processMode)
     {
@@ -583,6 +585,7 @@ protected function _prepareOptions(\Magento\Framework\DataObject $buyRequest, $p
         }
         if ($options !== null) {
             $results = [];
+            $extendedData = [];
             foreach ($options as $option) {
                 /* @var $option \Magento\Catalog\Model\Product\Option */
                 try {
@@ -594,6 +597,7 @@ protected function _prepareOptions(\Magento\Framework\DataObject $buyRequest, $p
                         ->validateUserValue($buyRequest->getOptions());
                 } catch (LocalizedException $e) {
                     $results[] = $e->getMessage();
+                    $extendedData[] = ['sku' => $product->getSku(), 'optionId' => $option->getId()];
                     continue;
                 }
 
@@ -603,7 +607,7 @@ protected function _prepareOptions(\Magento\Framework\DataObject $buyRequest, $p
                 }
             }
             if (count($results) > 0) {
-                throw new LocalizedException(__(implode("\n", $results)));
+                throw InvalidOptionInput::getExtendedMessage($results, $extendedData);
             }
         }
 

lib/internal/Magento/Framework/Exception/InvalidOptionInput.php

@@ -0,0 +1,61 @@
+<?php
+/**
+ * InvalidOptionInput Exception
+ *
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\Framework\Exception;
+
+use Magento\Framework\Phrase;
+
+/**
+ * InvalidOptionInput exception
+ *
+ * @api
+ */
+class InvalidOptionInput extends AbstractAggregateException implements AggregateExceptionInterface
+{
+    /**
+     * InvalidOptionInput constructor.
+     *
+     * @param \Magento\Framework\Phrase $phrase
+     * @param \Exception|null $cause
+     * @param int $code
+     */
+    public function __construct(Phrase $phrase = null, \Exception $cause = null, int $code = 0)
+    {
+        if ($phrase === null) {
+            $phrase = new Phrase(
+                'The product\'s required option(s) weren\'t entered. Make sure the options are entered and try again.'
+            );
+        }
+        parent::__construct($phrase, $cause, $code);
+    }
+
+    /**
+     * Get extended message
+     *
+     * @param array $messages
+     * @param array $extendedData
+     * @param \Exception|null $cause
+     *
+     * @return \Magento\Framework\Exception\InvalidOptionInput
+     */
+    public static function getExtendedMessage(array $messages, array $extendedData, \Exception $cause = null)
+    {
+        foreach ($messages as $key => &$value) {
+            // @codingStandardsIgnoreLine
+            $value .= " Please check input data: Product SKU - '{$extendedData[$key]['sku']}', Option ID - '{$extendedData[$key]['optionId']}'";
+        }
+
+        return new self(
+            new Phrase(
+                __(implode("\n", $messages))
+            ),
+            $cause
+        );
+    }
+}