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<?php
/**
* Copyright © Magento, Inc. All rights reserved.
* See COPYING.txt for license details.
*/
declare(strict_types=1);
namespace Magento\Framework\GraphQl\Query;
use GraphQL\Language\AST\DocumentNode;
use GraphQL\Language\AST\Node;
use GraphQL\Language\AST\NodeKind;
use Magento\Framework\App\ObjectManager;
use Magento\Framework\ObjectManager\ResetAfterRequestInterface;
/**
* This class holds a list of all queried fields and is used to enable performance optimization for schema loading.
*/
class Fields implements ResetAfterRequestInterface
{
/**
* @var string[]
*/
private $fieldsUsedInQuery = [];
/**
* @var QueryParser
*/
private $queryParser;
/**
* @param QueryParser|null $queryParser
*/
public function __construct(QueryParser $queryParser = null)
{
$this->queryParser = $queryParser ?: ObjectManager::getInstance()->get(QueryParser::class);
}
/**
* Set Query for extracting list of fields.
*
* @param DocumentNode|string $query
* @param array|null $variables
*
* @return void
*/
public function setQuery(DocumentNode|string $query, array $variables = null)
{
$queryFields = [];
try {
if (is_string($query)) {
$query = $this->queryParser->parse($query);
}
\GraphQL\Language\Visitor::visit(
$query,
[
'leave' => [
NodeKind::NAME => function (Node $node) use (&$queryFields) {
$queryFields[$node->value] = $node->value;
}
]
]
);
if (isset($variables)) {
$this->extractVariables($queryFields, $variables);
}
// phpcs:ignore Magento2.CodeAnalysis.EmptyBlock
} catch (\Exception $e) {
// If a syntax error is encountered do not collect fields
}
if (isset($queryFields['IntrospectionQuery']) || (isset($queryFields['__schema'])) ||
(isset($queryFields['__type']))) {
// It must be possible to query any fields during introspection query
$queryFields = [];
}
$this->fieldsUsedInQuery = $queryFields;
}
/**
* Get list of fields used in GraphQL query.
*
* This method is stateful and relies on the query being set with setQuery.
*
* @return string[]
*/
public function getFieldsUsedInQuery()
{
return $this->fieldsUsedInQuery;
}
/**
* Extract and return list of all used fields in GraphQL query's variables
*
* @param array $fields
* @param array $variables
*
* @return void
*/
private function extractVariables(array &$fields, array $variables): void
{
foreach ($variables as $key => $value) {
if (is_array($value)) {
$this->extractVariables($fields, $value);
} else {
if (is_string($key)) {
$fields[$key] = $key;
}
}
}
}
/**
* @inheritdoc
*/
public function _resetState(): void
{
$this->fieldsUsedInQuery = [];
}
}