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