1: <?php
2: /**
3: * XML handling for Cake.
4: *
5: * The methods in these classes enable the datasources that use XML to work.
6: *
7: * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
8: * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
9: *
10: * Licensed under The MIT License
11: * For full copyright and license information, please see the LICENSE.txt
12: * Redistributions of files must retain the above copyright notice.
13: *
14: * @copyright Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
15: * @link http://cakephp.org CakePHP(tm) Project
16: * @package Cake.Utility
17: * @since CakePHP v .0.10.3.1400
18: * @license http://www.opensource.org/licenses/mit-license.php MIT License
19: */
20:
21: App::uses('HttpSocket', 'Network/Http');
22:
23: /**
24: * XML handling for CakePHP.
25: *
26: * The methods in these classes enable the datasources that use XML to work.
27: *
28: * @package Cake.Utility
29: */
30: class Xml {
31:
32: /**
33: * Initialize SimpleXMLElement or DOMDocument from a given XML string, file path, URL or array.
34: *
35: * ### Usage:
36: *
37: * Building XML from a string:
38: *
39: * `$xml = Xml::build('<example>text</example>');`
40: *
41: * Building XML from string (output DOMDocument):
42: *
43: * `$xml = Xml::build('<example>text</example>', array('return' => 'domdocument'));`
44: *
45: * Building XML from a file path:
46: *
47: * `$xml = Xml::build('/path/to/an/xml/file.xml');`
48: *
49: * Building from a remote URL:
50: *
51: * `$xml = Xml::build('http://example.com/example.xml');`
52: *
53: * Building from an array:
54: *
55: * {{{
56: * $value = array(
57: * 'tags' => array(
58: * 'tag' => array(
59: * array(
60: * 'id' => '1',
61: * 'name' => 'defect'
62: * ),
63: * array(
64: * 'id' => '2',
65: * 'name' => 'enhancement'
66: * )
67: * )
68: * )
69: * );
70: * $xml = Xml::build($value);
71: * }}}
72: *
73: * When building XML from an array ensure that there is only one top level element.
74: *
75: * ### Options
76: *
77: * - `return` Can be 'simplexml' to return object of SimpleXMLElement or 'domdocument' to return DOMDocument.
78: * - `loadEntities` Defaults to false. Set to true to enable loading of `<!ENTITY` definitions. This
79: * is disabled by default for security reasons.
80: * - If using array as input, you can pass `options` from Xml::fromArray.
81: *
82: * @param string|array $input XML string, a path to a file, a URL or an array
83: * @param array $options The options to use
84: * @return SimpleXMLElement|DOMDocument SimpleXMLElement or DOMDocument
85: * @throws XmlException
86: */
87: public static function build($input, $options = array()) {
88: if (!is_array($options)) {
89: $options = array('return' => (string)$options);
90: }
91: $defaults = array(
92: 'return' => 'simplexml',
93: 'loadEntities' => false,
94: );
95: $options += $defaults;
96:
97: if (is_array($input) || is_object($input)) {
98: return self::fromArray((array)$input, $options);
99: } elseif (strpos($input, '<') !== false) {
100: return self::_loadXml($input, $options);
101: } elseif (file_exists($input)) {
102: return self::_loadXml(file_get_contents($input), $options);
103: } elseif (strpos($input, 'http://') === 0 || strpos($input, 'https://') === 0) {
104: try {
105: $socket = new HttpSocket(array('request' => array('redirect' => 10)));
106: $response = $socket->get($input);
107: if (!$response->isOk()) {
108: throw new XmlException(__d('cake_dev', 'XML cannot be read.'));
109: }
110: return self::_loadXml($response->body, $options);
111: } catch (SocketException $e) {
112: throw new XmlException(__d('cake_dev', 'XML cannot be read.'));
113: }
114: } elseif (!is_string($input)) {
115: throw new XmlException(__d('cake_dev', 'Invalid input.'));
116: }
117: throw new XmlException(__d('cake_dev', 'XML cannot be read.'));
118: }
119:
120: /**
121: * Parse the input data and create either a SimpleXmlElement object or a DOMDocument.
122: *
123: * @param string $input The input to load.
124: * @param array $options The options to use. See Xml::build()
125: * @return SimpleXmlElement|DOMDocument
126: * @throws XmlException
127: */
128: protected static function _loadXml($input, $options) {
129: $hasDisable = function_exists('libxml_disable_entity_loader');
130: $internalErrors = libxml_use_internal_errors(true);
131: if ($hasDisable && !$options['loadEntities']) {
132: libxml_disable_entity_loader(true);
133: }
134: try {
135: if ($options['return'] === 'simplexml' || $options['return'] === 'simplexmlelement') {
136: $xml = new SimpleXMLElement($input, LIBXML_NOCDATA);
137: } else {
138: $xml = new DOMDocument();
139: $xml->loadXML($input);
140: }
141: } catch (Exception $e) {
142: $xml = null;
143: }
144: if ($hasDisable && !$options['loadEntities']) {
145: libxml_disable_entity_loader(false);
146: }
147: libxml_use_internal_errors($internalErrors);
148: if ($xml === null) {
149: throw new XmlException(__d('cake_dev', 'Xml cannot be read.'));
150: }
151: return $xml;
152: }
153:
154: /**
155: * Transform an array into a SimpleXMLElement
156: *
157: * ### Options
158: *
159: * - `format` If create childs ('tags') or attributes ('attribute').
160: * - `pretty` Returns formatted Xml when set to `true`. Defaults to `false`
161: * - `version` Version of XML document. Default is 1.0.
162: * - `encoding` Encoding of XML document. If null remove from XML header. Default is the some of application.
163: * - `return` If return object of SimpleXMLElement ('simplexml') or DOMDocument ('domdocument'). Default is SimpleXMLElement.
164: *
165: * Using the following data:
166: *
167: * {{{
168: * $value = array(
169: * 'root' => array(
170: * 'tag' => array(
171: * 'id' => 1,
172: * 'value' => 'defect',
173: * '@' => 'description'
174: * )
175: * )
176: * );
177: * }}}
178: *
179: * Calling `Xml::fromArray($value, 'tags');` Will generate:
180: *
181: * `<root><tag><id>1</id><value>defect</value>description</tag></root>`
182: *
183: * And calling `Xml::fromArray($value, 'attribute');` Will generate:
184: *
185: * `<root><tag id="1" value="defect">description</tag></root>`
186: *
187: * @param array $input Array with data
188: * @param array $options The options to use
189: * @return SimpleXMLElement|DOMDocument SimpleXMLElement or DOMDocument
190: * @throws XmlException
191: */
192: public static function fromArray($input, $options = array()) {
193: if (!is_array($input) || count($input) !== 1) {
194: throw new XmlException(__d('cake_dev', 'Invalid input.'));
195: }
196: $key = key($input);
197: if (is_int($key)) {
198: throw new XmlException(__d('cake_dev', 'The key of input must be alphanumeric'));
199: }
200:
201: if (!is_array($options)) {
202: $options = array('format' => (string)$options);
203: }
204: $defaults = array(
205: 'format' => 'tags',
206: 'version' => '1.0',
207: 'encoding' => Configure::read('App.encoding'),
208: 'return' => 'simplexml',
209: 'pretty' => false
210: );
211: $options += $defaults;
212:
213: $dom = new DOMDocument($options['version'], $options['encoding']);
214: if ($options['pretty']) {
215: $dom->formatOutput = true;
216: }
217: self::_fromArray($dom, $dom, $input, $options['format']);
218:
219: $options['return'] = strtolower($options['return']);
220: if ($options['return'] === 'simplexml' || $options['return'] === 'simplexmlelement') {
221: return new SimpleXMLElement($dom->saveXML());
222: }
223: return $dom;
224: }
225:
226: /**
227: * Recursive method to create childs from array
228: *
229: * @param DOMDocument $dom Handler to DOMDocument
230: * @param DOMElement $node Handler to DOMElement (child)
231: * @param array &$data Array of data to append to the $node.
232: * @param string $format Either 'attribute' or 'tags'. This determines where nested keys go.
233: * @return void
234: * @throws XmlException
235: */
236: protected static function _fromArray($dom, $node, &$data, $format) {
237: if (empty($data) || !is_array($data)) {
238: return;
239: }
240: foreach ($data as $key => $value) {
241: if (is_string($key)) {
242: if (!is_array($value)) {
243: if (is_bool($value)) {
244: $value = (int)$value;
245: } elseif ($value === null) {
246: $value = '';
247: }
248: $isNamespace = strpos($key, 'xmlns:');
249: if ($isNamespace !== false) {
250: $node->setAttributeNS('http://www.w3.org/2000/xmlns/', $key, $value);
251: continue;
252: }
253: if ($key[0] !== '@' && $format === 'tags') {
254: $child = null;
255: if (!is_numeric($value)) {
256: // Escape special characters
257: // http://www.w3.org/TR/REC-xml/#syntax
258: // https://bugs.php.net/bug.php?id=36795
259: $child = $dom->createElement($key, '');
260: $child->appendChild(new DOMText($value));
261: } else {
262: $child = $dom->createElement($key, $value);
263: }
264: $node->appendChild($child);
265: } else {
266: if ($key[0] === '@') {
267: $key = substr($key, 1);
268: }
269: $attribute = $dom->createAttribute($key);
270: $attribute->appendChild($dom->createTextNode($value));
271: $node->appendChild($attribute);
272: }
273: } else {
274: if ($key[0] === '@') {
275: throw new XmlException(__d('cake_dev', 'Invalid array'));
276: }
277: if (is_numeric(implode('', array_keys($value)))) { // List
278: foreach ($value as $item) {
279: $itemData = compact('dom', 'node', 'key', 'format');
280: $itemData['value'] = $item;
281: self::_createChild($itemData);
282: }
283: } else { // Struct
284: self::_createChild(compact('dom', 'node', 'key', 'value', 'format'));
285: }
286: }
287: } else {
288: throw new XmlException(__d('cake_dev', 'Invalid array'));
289: }
290: }
291: }
292:
293: /**
294: * Helper to _fromArray(). It will create childs of arrays
295: *
296: * @param array $data Array with informations to create childs
297: * @return void
298: */
299: protected static function _createChild($data) {
300: extract($data);
301: $childNS = $childValue = null;
302: if (is_array($value)) {
303: if (isset($value['@'])) {
304: $childValue = (string)$value['@'];
305: unset($value['@']);
306: }
307: if (isset($value['xmlns:'])) {
308: $childNS = $value['xmlns:'];
309: unset($value['xmlns:']);
310: }
311: } elseif (!empty($value) || $value === 0) {
312: $childValue = (string)$value;
313: }
314:
315: $child = $dom->createElement($key);
316: if ($childValue !== null) {
317: $child->appendChild($dom->createTextNode($childValue));
318: }
319: if ($childNS) {
320: $child->setAttribute('xmlns', $childNS);
321: }
322:
323: self::_fromArray($dom, $child, $value, $format);
324: $node->appendChild($child);
325: }
326:
327: /**
328: * Returns this XML structure as an array.
329: *
330: * @param SimpleXMLElement|DOMDocument|DOMNode $obj SimpleXMLElement, DOMDocument or DOMNode instance
331: * @return array Array representation of the XML structure.
332: * @throws XmlException
333: */
334: public static function toArray($obj) {
335: if ($obj instanceof DOMNode) {
336: $obj = simplexml_import_dom($obj);
337: }
338: if (!($obj instanceof SimpleXMLElement)) {
339: throw new XmlException(__d('cake_dev', 'The input is not instance of SimpleXMLElement, DOMDocument or DOMNode.'));
340: }
341: $result = array();
342: $namespaces = array_merge(array('' => ''), $obj->getNamespaces(true));
343: self::_toArray($obj, $result, '', array_keys($namespaces));
344: return $result;
345: }
346:
347: /**
348: * Recursive method to toArray
349: *
350: * @param SimpleXMLElement $xml SimpleXMLElement object
351: * @param array &$parentData Parent array with data
352: * @param string $ns Namespace of current child
353: * @param array $namespaces List of namespaces in XML
354: * @return void
355: */
356: protected static function _toArray($xml, &$parentData, $ns, $namespaces) {
357: $data = array();
358:
359: foreach ($namespaces as $namespace) {
360: foreach ($xml->attributes($namespace, true) as $key => $value) {
361: if (!empty($namespace)) {
362: $key = $namespace . ':' . $key;
363: }
364: $data['@' . $key] = (string)$value;
365: }
366:
367: foreach ($xml->children($namespace, true) as $child) {
368: self::_toArray($child, $data, $namespace, $namespaces);
369: }
370: }
371:
372: $asString = trim((string)$xml);
373: if (empty($data)) {
374: $data = $asString;
375: } elseif (strlen($asString) > 0) {
376: $data['@'] = $asString;
377: }
378:
379: if (!empty($ns)) {
380: $ns .= ':';
381: }
382: $name = $ns . $xml->getName();
383: if (isset($parentData[$name])) {
384: if (!is_array($parentData[$name]) || !isset($parentData[$name][0])) {
385: $parentData[$name] = array($parentData[$name]);
386: }
387: $parentData[$name][] = $data;
388: } else {
389: $parentData[$name] = $data;
390: }
391: }
392:
393: }
394: