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485 lines
16 KiB
485 lines
16 KiB
<?php
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/**
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* CakePHP(tm) : Rapid Development Framework (https://cakephp.org)
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* Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
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*
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* Licensed under The MIT License
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* For full copyright and license information, please see the LICENSE.txt
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* Redistributions of files must retain the above copyright notice.
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*
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* @copyright Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
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* @link https://cakephp.org CakePHP(tm) Project
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* @since 0.10.3
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* @license https://opensource.org/licenses/mit-license.php MIT License
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*/
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namespace Cake\Utility;
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use Cake\Utility\Exception\XmlException;
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use DOMDocument;
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use DOMNode;
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use DOMText;
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use Exception;
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use SimpleXMLElement;
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/**
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* XML handling for CakePHP.
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*
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* The methods in these classes enable the datasources that use XML to work.
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*/
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class Xml
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{
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/**
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* Initialize SimpleXMLElement or DOMDocument from a given XML string, file path, URL or array.
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*
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* ### Usage:
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*
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* Building XML from a string:
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*
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* ```
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* $xml = Xml::build('<example>text</example>');
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* ```
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*
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* Building XML from string (output DOMDocument):
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*
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* ```
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* $xml = Xml::build('<example>text</example>', ['return' => 'domdocument']);
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* ```
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*
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* Building XML from a file path:
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*
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* ```
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* $xml = Xml::build('/path/to/an/xml/file.xml');
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* ```
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*
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* Building XML from a remote URL:
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*
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* ```
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* use Cake\Http\Client;
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*
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* $http = new Client();
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* $response = $http->get('http://example.com/example.xml');
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* $xml = Xml::build($response->body());
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* ```
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*
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* Building from an array:
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*
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* ```
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* $value = [
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* 'tags' => [
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* 'tag' => [
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* [
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* 'id' => '1',
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* 'name' => 'defect'
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* ],
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* [
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* 'id' => '2',
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* 'name' => 'enhancement'
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* ]
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* ]
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* ]
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* ];
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* $xml = Xml::build($value);
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* ```
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*
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* When building XML from an array ensure that there is only one top level element.
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*
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* ### Options
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*
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* - `return` Can be 'simplexml' to return object of SimpleXMLElement or 'domdocument' to return DOMDocument.
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* - `loadEntities` Defaults to false. Set to true to enable loading of `<!ENTITY` definitions. This
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* is disabled by default for security reasons.
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* - `readFile` Set to false to disable file reading. This is important to disable when
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* putting user data into Xml::build(). If enabled local files will be read if they exist.
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* Defaults to true for backwards compatibility reasons.
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* - `parseHuge` Enable the `LIBXML_PARSEHUGE` flag.
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*
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* If using array as input, you can pass `options` from Xml::fromArray.
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*
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* @param string|array $input XML string, a path to a file, a URL or an array
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* @param array $options The options to use
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* @return \SimpleXMLElement|\DOMDocument SimpleXMLElement or DOMDocument
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* @throws \Cake\Utility\Exception\XmlException
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*/
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public static function build($input, array $options = [])
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{
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$defaults = [
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'return' => 'simplexml',
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'loadEntities' => false,
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'readFile' => true,
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'parseHuge' => false,
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];
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$options += $defaults;
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if (is_array($input) || is_object($input)) {
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return static::fromArray($input, $options);
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}
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if (strpos($input, '<') !== false) {
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return static::_loadXml($input, $options);
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}
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if ($options['readFile'] && file_exists($input)) {
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return static::_loadXml(file_get_contents($input), $options);
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}
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if (!is_string($input)) {
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throw new XmlException('Invalid input.');
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}
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throw new XmlException('XML cannot be read.');
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}
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/**
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* Parse the input data and create either a SimpleXmlElement object or a DOMDocument.
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*
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* @param string $input The input to load.
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* @param array $options The options to use. See Xml::build()
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* @return \SimpleXMLElement|\DOMDocument
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* @throws \Cake\Utility\Exception\XmlException
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*/
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protected static function _loadXml($input, $options)
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{
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$hasDisable = function_exists('libxml_disable_entity_loader');
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$internalErrors = libxml_use_internal_errors(true);
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if ($hasDisable && !$options['loadEntities']) {
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libxml_disable_entity_loader(true);
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}
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$flags = 0;
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if (!empty($options['parseHuge'])) {
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$flags |= LIBXML_PARSEHUGE;
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}
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try {
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if ($options['return'] === 'simplexml' || $options['return'] === 'simplexmlelement') {
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$flags |= LIBXML_NOCDATA;
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$xml = new SimpleXMLElement($input, $flags);
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} else {
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$xml = new DOMDocument();
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$xml->loadXML($input, $flags);
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}
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return $xml;
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} catch (Exception $e) {
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throw new XmlException('Xml cannot be read. ' . $e->getMessage(), null, $e);
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} finally {
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if ($hasDisable && !$options['loadEntities']) {
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libxml_disable_entity_loader(false);
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}
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libxml_use_internal_errors($internalErrors);
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}
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}
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/**
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* Parse the input html string and create either a SimpleXmlElement object or a DOMDocument.
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*
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* @param string $input The input html string to load.
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* @param array $options The options to use. See Xml::build()
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* @return \SimpleXMLElement|\DOMDocument
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* @throws \Cake\Utility\Exception\XmlException
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*/
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public static function loadHtml($input, $options = [])
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{
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$defaults = [
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'return' => 'simplexml',
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'loadEntities' => false,
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];
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$options += $defaults;
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$hasDisable = function_exists('libxml_disable_entity_loader');
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$internalErrors = libxml_use_internal_errors(true);
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if ($hasDisable && !$options['loadEntities']) {
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libxml_disable_entity_loader(true);
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}
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$flags = 0;
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if (!empty($options['parseHuge'])) {
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$flags |= LIBXML_PARSEHUGE;
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}
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try {
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$xml = new DOMDocument();
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$xml->loadHTML($input, $flags);
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if ($options['return'] === 'simplexml' || $options['return'] === 'simplexmlelement') {
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$flags |= LIBXML_NOCDATA;
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$xml = simplexml_import_dom($xml);
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}
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return $xml;
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} catch (Exception $e) {
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throw new XmlException('Xml cannot be read. ' . $e->getMessage(), null, $e);
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} finally {
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if ($hasDisable && !$options['loadEntities']) {
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libxml_disable_entity_loader(false);
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}
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libxml_use_internal_errors($internalErrors);
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}
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}
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/**
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* Transform an array into a SimpleXMLElement
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*
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* ### Options
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*
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* - `format` If create childs ('tags') or attributes ('attributes').
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* - `pretty` Returns formatted Xml when set to `true`. Defaults to `false`
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* - `version` Version of XML document. Default is 1.0.
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* - `encoding` Encoding of XML document. If null remove from XML header. Default is the some of application.
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* - `return` If return object of SimpleXMLElement ('simplexml') or DOMDocument ('domdocument'). Default is SimpleXMLElement.
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*
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* Using the following data:
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*
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* ```
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* $value = [
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* 'root' => [
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* 'tag' => [
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* 'id' => 1,
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* 'value' => 'defect',
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* '@' => 'description'
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* ]
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* ]
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* ];
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* ```
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*
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* Calling `Xml::fromArray($value, 'tags');` Will generate:
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*
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* `<root><tag><id>1</id><value>defect</value>description</tag></root>`
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*
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* And calling `Xml::fromArray($value, 'attributes');` Will generate:
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*
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* `<root><tag id="1" value="defect">description</tag></root>`
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*
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* @param array|\Cake\Collection\Collection $input Array with data or a collection instance.
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* @param string|array $options The options to use or a string to use as format.
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* @return \SimpleXMLElement|\DOMDocument SimpleXMLElement or DOMDocument
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* @throws \Cake\Utility\Exception\XmlException
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*/
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public static function fromArray($input, $options = [])
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{
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if (is_object($input) && method_exists($input, 'toArray') && is_callable([$input, 'toArray'])) {
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$input = call_user_func([$input, 'toArray']);
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}
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if (!is_array($input) || count($input) !== 1) {
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throw new XmlException('Invalid input.');
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}
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$key = key($input);
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if (is_int($key)) {
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throw new XmlException('The key of input must be alphanumeric');
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}
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if (!is_array($options)) {
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$options = ['format' => (string)$options];
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}
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$defaults = [
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'format' => 'tags',
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'version' => '1.0',
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'encoding' => mb_internal_encoding(),
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'return' => 'simplexml',
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'pretty' => false,
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];
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$options += $defaults;
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$dom = new DOMDocument($options['version'], $options['encoding']);
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if ($options['pretty']) {
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$dom->formatOutput = true;
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}
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self::_fromArray($dom, $dom, $input, $options['format']);
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$options['return'] = strtolower($options['return']);
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if ($options['return'] === 'simplexml' || $options['return'] === 'simplexmlelement') {
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return new SimpleXMLElement($dom->saveXML());
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}
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return $dom;
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}
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/**
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* Recursive method to create childs from array
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*
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* @param \DOMDocument $dom Handler to DOMDocument
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* @param \DOMElement $node Handler to DOMElement (child)
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* @param array $data Array of data to append to the $node.
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* @param string $format Either 'attributes' or 'tags'. This determines where nested keys go.
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* @return void
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* @throws \Cake\Utility\Exception\XmlException
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*/
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protected static function _fromArray($dom, $node, &$data, $format)
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{
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if (empty($data) || !is_array($data)) {
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return;
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}
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foreach ($data as $key => $value) {
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if (is_string($key)) {
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if (is_object($value) && method_exists($value, 'toArray') && is_callable([$value, 'toArray'])) {
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$value = call_user_func([$value, 'toArray']);
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}
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if (!is_array($value)) {
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if (is_bool($value)) {
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$value = (int)$value;
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} elseif ($value === null) {
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$value = '';
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}
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$isNamespace = strpos($key, 'xmlns:');
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if ($isNamespace !== false) {
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$node->setAttributeNS('http://www.w3.org/2000/xmlns/', $key, $value);
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continue;
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}
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if ($key[0] !== '@' && $format === 'tags') {
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if (!is_numeric($value)) {
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// Escape special characters
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// https://www.w3.org/TR/REC-xml/#syntax
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// https://bugs.php.net/bug.php?id=36795
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$child = $dom->createElement($key, '');
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$child->appendChild(new DOMText($value));
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} else {
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$child = $dom->createElement($key, $value);
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}
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$node->appendChild($child);
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} else {
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if ($key[0] === '@') {
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$key = substr($key, 1);
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}
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$attribute = $dom->createAttribute($key);
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$attribute->appendChild($dom->createTextNode($value));
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$node->appendChild($attribute);
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}
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} else {
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if ($key[0] === '@') {
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throw new XmlException('Invalid array');
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}
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if (is_numeric(implode('', array_keys($value)))) {
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// List
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foreach ($value as $item) {
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$itemData = compact('dom', 'node', 'key', 'format');
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$itemData['value'] = $item;
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static::_createChild($itemData);
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}
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} else {
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// Struct
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static::_createChild(compact('dom', 'node', 'key', 'value', 'format'));
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}
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}
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} else {
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throw new XmlException('Invalid array');
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}
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}
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}
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/**
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* Helper to _fromArray(). It will create childs of arrays
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*
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* @param array $data Array with information to create childs
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* @return void
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*/
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protected static function _createChild($data)
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{
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$data += [
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'dom' => null,
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'node' => null,
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'key' => null,
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'value' => null,
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'format' => null,
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];
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$value = $data['value'];
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$dom = $data['dom'];
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$key = $data['key'];
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$format = $data['format'];
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$node = $data['node'];
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$childNS = $childValue = null;
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if (is_object($value) && method_exists($value, 'toArray') && is_callable([$value, 'toArray'])) {
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$value = call_user_func([$value, 'toArray']);
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}
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if (is_array($value)) {
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if (isset($value['@'])) {
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$childValue = (string)$value['@'];
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unset($value['@']);
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}
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if (isset($value['xmlns:'])) {
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$childNS = $value['xmlns:'];
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unset($value['xmlns:']);
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}
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} elseif (!empty($value) || $value === 0 || $value === '0') {
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$childValue = (string)$value;
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}
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$child = $dom->createElement($key);
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if ($childValue !== null) {
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$child->appendChild($dom->createTextNode($childValue));
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}
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if ($childNS) {
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$child->setAttribute('xmlns', $childNS);
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}
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static::_fromArray($dom, $child, $value, $format);
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$node->appendChild($child);
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}
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/**
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* Returns this XML structure as an array.
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*
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* @param \SimpleXMLElement|\DOMDocument|\DOMNode $obj SimpleXMLElement, DOMDocument or DOMNode instance
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* @return array Array representation of the XML structure.
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* @throws \Cake\Utility\Exception\XmlException
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*/
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public static function toArray($obj)
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{
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if ($obj instanceof DOMNode) {
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$obj = simplexml_import_dom($obj);
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}
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if (!($obj instanceof SimpleXMLElement)) {
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throw new XmlException('The input is not instance of SimpleXMLElement, DOMDocument or DOMNode.');
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}
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$result = [];
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$namespaces = array_merge(['' => ''], $obj->getNamespaces(true));
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static::_toArray($obj, $result, '', array_keys($namespaces));
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return $result;
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}
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/**
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* Recursive method to toArray
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*
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* @param \SimpleXMLElement $xml SimpleXMLElement object
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* @param array $parentData Parent array with data
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* @param string $ns Namespace of current child
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* @param string[] $namespaces List of namespaces in XML
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* @return void
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*/
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protected static function _toArray($xml, &$parentData, $ns, $namespaces)
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{
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$data = [];
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foreach ($namespaces as $namespace) {
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foreach ($xml->attributes($namespace, true) as $key => $value) {
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if (!empty($namespace)) {
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$key = $namespace . ':' . $key;
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}
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$data['@' . $key] = (string)$value;
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}
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foreach ($xml->children($namespace, true) as $child) {
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static::_toArray($child, $data, $namespace, $namespaces);
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}
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}
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$asString = trim((string)$xml);
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if (empty($data)) {
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$data = $asString;
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} elseif (strlen($asString) > 0) {
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$data['@'] = $asString;
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}
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if (!empty($ns)) {
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$ns .= ':';
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}
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$name = $ns . $xml->getName();
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if (isset($parentData[$name])) {
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if (!is_array($parentData[$name]) || !isset($parentData[$name][0])) {
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$parentData[$name] = [$parentData[$name]];
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}
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$parentData[$name][] = $data;
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} else {
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$parentData[$name] = $data;
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}
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}
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}
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