Subversion Repositories SmartDukaan

<?php
/**
 * XML handling for Cake.
 *
 * The methods in these classes enable the datasources that use XML to work.
 *
 * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
 * Copyright (c) Cake Software Foundation, Inc. (http://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. (http://cakefoundation.org)
 * @link          http://cakephp.org CakePHP(tm) Project
 * @package       Cake.Utility
 * @since         CakePHP v .0.10.3.1400
 * @license       http://www.opensource.org/licenses/mit-license.php MIT License
 */

App::uses('HttpSocket', 'Network/Http');

/**
 * XML handling for CakePHP.
 *
 * The methods in these classes enable the datasources that use XML to work.
 *
 * @package       Cake.Utility
 */
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>', array('return' => 'domdocument'));`
 *
 * Building XML from a file path:
 *
 * `$xml = Xml::build('/path/to/an/xml/file.xml');`
 *
 * Building from a remote URL:
 *
 * `$xml = Xml::build('http://example.com/example.xml');`
 *
 * Building from an array:
 *
 * {{{
 *      $value = array(
 *              'tags' => array(
 *                      'tag' => array(
 *                              array(
 *                                      'id' => '1',
 *                                      'name' => 'defect'
 *                              ),
 *                              array(
 *                                      '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.
 * - 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 $options The options to use
 * @return SimpleXMLElement|DOMDocument SimpleXMLElement or DOMDocument
 * @throws XmlException
 */
        public static function build($input, $options = array()) {
                if (!is_array($options)) {
                        $options = array('return' => (string)$options);
                }
                $defaults = array(
                        'return' => 'simplexml',
                        'loadEntities' => false,
                );
                $options += $defaults;

                if (is_array($input) || is_object($input)) {
                        return self::fromArray((array)$input, $options);
                } elseif (strpos($input, '<') !== false) {
                        return self::_loadXml($input, $options);
                } elseif (file_exists($input)) {
                        return self::_loadXml(file_get_contents($input), $options);
                } elseif (strpos($input, 'http://') === 0 || strpos($input, 'https://') === 0) {
                        try {
                                $socket = new HttpSocket(array('request' => array('redirect' => 10)));
                                $response = $socket->get($input);
                                if (!$response->isOk()) {
                                        throw new XmlException(__d('cake_dev', 'XML cannot be read.'));
                                }
                                return self::_loadXml($response->body, $options);
                        } catch (SocketException $e) {
                                throw new XmlException(__d('cake_dev', 'XML cannot be read.'));
                        }
                } elseif (!is_string($input)) {
                        throw new XmlException(__d('cake_dev', 'Invalid input.'));
                }
                throw new XmlException(__d('cake_dev', '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 $options The options to use. See Xml::build()
 * @return SimpleXmlElement|DOMDocument
 * @throws XmlException
 */
        protected static function _loadXml($input, $options) {
                $hasDisable = function_exists('libxml_disable_entity_loader');
                $internalErrors = libxml_use_internal_errors(true);
                if ($hasDisable && !$options['loadEntities']) {
                        libxml_disable_entity_loader(true);
                }
                try {
                        if ($options['return'] === 'simplexml' || $options['return'] === 'simplexmlelement') {
                                $xml = new SimpleXMLElement($input, LIBXML_NOCDATA);
                        } else {
                                $xml = new DOMDocument();
                                $xml->loadXML($input);
                        }
                } catch (Exception $e) {
                        $xml = null;
                }
                if ($hasDisable && !$options['loadEntities']) {
                        libxml_disable_entity_loader(false);
                }
                libxml_use_internal_errors($internalErrors);
                if ($xml === null) {
                        throw new XmlException(__d('cake_dev', 'Xml cannot be read.'));
                }
                return $xml;
        }

/**
 * Transform an array into a SimpleXMLElement
 *
 * ### Options
 *
 * - `format` If create childs ('tags') or attributes ('attribute').
 * - `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:
 *
 * {{{
 * $value = array(
 *    'root' => array(
 *        'tag' => array(
 *            'id' => 1,
 *            'value' => 'defect',
 *            '@' => 'description'
 *         )
 *     )
 * );
 * }}}
 *
 * Calling `Xml::fromArray($value, 'tags');`  Will generate:
 *
 * `<root><tag><id>1</id><value>defect</value>description</tag></root>`
 *
 * And calling `Xml::fromArray($value, 'attribute');` Will generate:
 *
 * `<root><tag id="1" value="defect">description</tag></root>`
 *
 * @param array $input Array with data
 * @param array $options The options to use
 * @return SimpleXMLElement|DOMDocument SimpleXMLElement or DOMDocument
 * @throws XmlException
 */
        public static function fromArray($input, $options = array()) {
                if (!is_array($input) || count($input) !== 1) {
                        throw new XmlException(__d('cake_dev', 'Invalid input.'));
                }
                $key = key($input);
                if (is_int($key)) {
                        throw new XmlException(__d('cake_dev', 'The key of input must be alphanumeric'));
                }

                if (!is_array($options)) {
                        $options = array('format' => (string)$options);
                }
                $defaults = array(
                        'format' => 'tags',
                        'version' => '1.0',
                        'encoding' => Configure::read('App.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 $format Either 'attribute' or 'tags'. This determines where nested keys go.
 * @return void
 * @throws XmlException
 */
        protected static function _fromArray($dom, $node, &$data, $format) {
                if (empty($data) || !is_array($data)) {
                        return;
                }
                foreach ($data as $key => $value) {
                        if (is_string($key)) {
                                if (!is_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, $value);
                                                continue;
                                        }
                                        if ($key[0] !== '@' && $format === 'tags') {
                                                $child = null;
                                                if (!is_numeric($value)) {
                                                        // Escape special characters
                                                        // http://www.w3.org/TR/REC-xml/#syntax
                                                        // https://bugs.php.net/bug.php?id=36795
                                                        $child = $dom->createElement($key, '');
                                                        $child->appendChild(new DOMText($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 ($key[0] === '@') {
                                                throw new XmlException(__d('cake_dev', 'Invalid array'));
                                        }
                                        if (is_numeric(implode('', array_keys($value)))) { // List
                                                foreach ($value as $item) {
                                                        $itemData = compact('dom', 'node', 'key', 'format');
                                                        $itemData['value'] = $item;
                                                        self::_createChild($itemData);
                                                }
                                        } else { // Struct
                                                self::_createChild(compact('dom', 'node', 'key', 'value', 'format'));
                                        }
                                }
                        } else {
                                throw new XmlException(__d('cake_dev', 'Invalid array'));
                        }
                }
        }

/**
 * Helper to _fromArray(). It will create childs of arrays
 *
 * @param array $data Array with informations to create childs
 * @return void
 */
        protected static function _createChild($data) {
                extract($data);
                $childNS = $childValue = null;
                if (is_array($value)) {
                        if (isset($value['@'])) {
                                $childValue = (string)$value['@'];
                                unset($value['@']);
                        }
                        if (isset($value['xmlns:'])) {
                                $childNS = $value['xmlns:'];
                                unset($value['xmlns:']);
                        }
                } elseif (!empty($value) || $value === 0) {
                        $childValue = (string)$value;
                }

                $child = $dom->createElement($key);
                if ($childValue !== null) {
                        $child->appendChild($dom->createTextNode($childValue));
                }
                if ($childNS) {
                        $child->setAttribute('xmlns', $childNS);
                }

                self::_fromArray($dom, $child, $value, $format);
                $node->appendChild($child);
        }

/**
 * Returns this XML structure as a array.
 *
 * @param SimpleXMLElement|DOMDocument|DOMNode $obj SimpleXMLElement, DOMDocument or DOMNode instance
 * @return array Array representation of the XML structure.
 * @throws XmlException
 */
        public static function toArray($obj) {
                if ($obj instanceof DOMNode) {
                        $obj = simplexml_import_dom($obj);
                }
                if (!($obj instanceof SimpleXMLElement)) {
                        throw new XmlException(__d('cake_dev', 'The input is not instance of SimpleXMLElement, DOMDocument or DOMNode.'));
                }
                $result = array();
                $namespaces = array_merge(array('' => ''), $obj->getNamespaces(true));
                self::_toArray($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 array $namespaces List of namespaces in XML
 * @return void
 */
        protected static function _toArray($xml, &$parentData, $ns, $namespaces) {
                $data = array();

                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 $child) {
                                self::_toArray($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] = array($parentData[$name]);
                        }
                        $parentData[$name][] = $data;
                } else {
                        $parentData[$name] = $data;
                }
        }

}