File OpenSearch/Serializers/SmartSerializer.php

1:	<?php
2:
3:	declare(strict_types=1);
4:
5:	/**
6:	* Copyright OpenSearch Contributors
7:	* SPDX-License-Identifier: Apache-2.0
8:	*
9:	* OpenSearch PHP client
10:	*
11:	* @link https://github.com/opensearch-project/opensearch-php/
12:	* @copyright Copyright (c) Elasticsearch B.V (https://www.elastic.co)
13:	* @license http://www.apache.org/licenses/LICENSE-2.0 Apache License, Version 2.0
14:	* @license https://www.gnu.org/licenses/lgpl-2.1.html GNU Lesser General Public License, Version 2.1
15:	*
16:	* Licensed to Elasticsearch B.V under one or more agreements.
17:	* Elasticsearch B.V licenses this file to you under the Apache 2.0 License or
18:	* the GNU Lesser General Public License, Version 2.1, at your option.
19:	* See the LICENSE file in the project root for more information.
20:	*/
21:
22:	namespace OpenSearch\Serializers;
23:
24:	use OpenSearch\Exception\JsonException;
25:	use OpenSearch\Exception\RuntimeException;
26:
27:	if (!defined('JSON_INVALID_UTF8_SUBSTITUTE')) {
28:	//PHP < 7.2 Define it as 0 so it does nothing
29:	define('JSON_INVALID_UTF8_SUBSTITUTE', 0);
30:	}
31:
32:	class SmartSerializer implements SerializerInterface
33:	{
34:	/**
35:	* {@inheritdoc}
36:	*/
37:	public function serialize($data): string
38:	{
39:	if (is_string($data) === true) {
40:	return $data;
41:	} else {
42:	$data = json_encode($data, JSON_PRESERVE_ZERO_FRACTION + JSON_INVALID_UTF8_SUBSTITUTE);
43:	if ($data === false) {
44:	throw new RuntimeException("Failed to JSON encode: ".json_last_error_msg());
45:	}
46:	if ($data === '[]') {
47:	return '{}';
48:	} else {
49:	return $data;
50:	}
51:	}
52:	}
53:
54:	/**
55:	* {@inheritdoc}
56:	*/
57:	public function deserialize(?string $data, array $headers)
58:	{
59:	if ($this->isJson($headers)) {
60:	return $this->decode($data);
61:	}
62:	return $data;
63:	}
64:
65:	/**
66:	* Decode JSON data.
67:	*
68:	* @throws \OpenSearch\Exception\JsonException
69:	*/
70:	private function decode(?string $data): array
71:	{
72:	if ($data === null \|\| strlen($data) === 0) {
73:	return [];
74:	}
75:
76:	try {
77:	return json_decode($data, true, 512, JSON_THROW_ON_ERROR);
78:	} catch (\JsonException $e) {
79:	throw new JsonException($e->getCode(), $data, $e);
80:	}
81:	}
82:
83:	/**
84:	* Check the response content type to see if it is JSON.
85:	*
86:	* @param array<string,mixed> $headers
87:	*/
88:	private function isJson(array $headers): bool
89:	{
90:	// Legacy support for 'transfer_stats'.
91:	if (!empty($headers['content_type'])) {
92:	return str_contains($headers['content_type'], 'json');
93:	}
94:
95:	// Check PSR-7 headers.
96:	$lowercaseHeaders = array_change_key_case($headers, CASE_LOWER);
97:	if (array_key_exists('content-type', $lowercaseHeaders)) {
98:	foreach ($lowercaseHeaders['content-type'] as $type) {
99:	if (str_contains($type, 'json')) {
100:	return true;
101:	}
102:	}
103:	return false;
104:	}
105:
106:	// No content type header, so assume it is JSON.
107:	return true;
108:	}
109:	}
110:

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