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XmlUtils.php
001 <?php
002
003 /*
004 * This file is part of the Symfony package.
005 *
006 * (c) Fabien Potencier <fabien@symfony.com>
007 *
008 * For the full copyright and license information, please view the LICENSE
009 * file that was distributed with this source code.
010 */
011
012 namespace Symfony\Component\Config\Util;
013
014 /**
015 * XMLUtils is a bunch of utility methods to XML operations.
016 *
017 * This class contains static methods only and is not meant to be instantiated.
018 *
019 * @author Fabien Potencier <fabien@symfony.com>
020 * @author Martin Hasoň <martin.hason@gmail.com>
021 */
022 class XmlUtils
023 {
024 /**
025 * This class should not be instantiated.
026 */
027 private function __construct()
028 {
029 }
030
031 /**
032 * Loads an XML file.
033 *
034 * @param string $file An XML file path
035 * @param string|callable|null $schemaOrCallable An XSD schema file path, a callable, or null to disable validation
036 *
037 * @return \DOMDocument
038 *
039 * @throws \InvalidArgumentException When loading of XML file returns error
040 */
041 public static function loadFile($file, $schemaOrCallable = null)
042 {
043 $content = @file_get_contents($file);
044 if ('' === trim($content)) {
045 throw new \InvalidArgumentException(sprintf('File %s does not contain valid XML, it is empty.', $file));
046 }
047
048 $internalErrors = libxml_use_internal_errors(true);
049 $disableEntities = libxml_disable_entity_loader(true);
050 libxml_clear_errors();
051
052 $dom = new \DOMDocument();
053 $dom->validateOnParse = true;
054 if (!$dom->loadXML($content, LIBXML_NONET | (defined('LIBXML_COMPACT') ? LIBXML_COMPACT : 0))) {
055 libxml_disable_entity_loader($disableEntities);
056
057 throw new \InvalidArgumentException(implode("\n", static::getXmlErrors($internalErrors)));
058 }
059
060 $dom->normalizeDocument();
061
062 libxml_use_internal_errors($internalErrors);
063 libxml_disable_entity_loader($disableEntities);
064
065 foreach ($dom->childNodes as $child) {
066 if ($child->nodeType === XML_DOCUMENT_TYPE_NODE) {
067 throw new \InvalidArgumentException('Document types are not allowed.');
068 }
069 }
070
071 if (null !== $schemaOrCallable) {
072 $internalErrors = libxml_use_internal_errors(true);
073 libxml_clear_errors();
074
075 $e = null;
076 if (is_callable($schemaOrCallable)) {
077 try {
078 $valid = call_user_func($schemaOrCallable, $dom, $internalErrors);
079 } catch (\Exception $e) {
080 $valid = false;
081 }
082 } elseif (!is_array($schemaOrCallable) && is_file((string) $schemaOrCallable)) {
083 $schemaSource = file_get_contents((string) $schemaOrCallable);
084 $valid = @$dom->schemaValidateSource($schemaSource);
085 } else {
086 libxml_use_internal_errors($internalErrors);
087
088 throw new \InvalidArgumentException('The schemaOrCallable argument has to be a valid path to XSD file or callable.');
089 }
090
091 if (!$valid) {
092 $messages = static::getXmlErrors($internalErrors);
093 if (empty($messages)) {
094 $messages = array(sprintf('The XML file "%s" is not valid.', $file));
095 }
096 throw new \InvalidArgumentException(implode("\n", $messages), 0, $e);
097 }
098 }
099
100 libxml_clear_errors();
101 libxml_use_internal_errors($internalErrors);
102
103 return $dom;
104 }
105
106 /**
107 * Converts a \DomElement object to a PHP array.
108 *
109 * The following rules applies during the conversion:
110 *
111 * * Each tag is converted to a key value or an array
112 * if there is more than one "value"
113 *
114 * * The content of a tag is set under a "value" key (<foo>bar</foo>)
115 * if the tag also has some nested tags
116 *
117 * * The attributes are converted to keys (<foo foo="bar"/>)
118 *
119 * * The nested-tags are converted to keys (<foo><foo>bar</foo></foo>)
120 *
121 * @param \DomElement $element A \DomElement instance
122 * @param bool $checkPrefix Check prefix in an element or an attribute name
123 *
124 * @return array A PHP array
125 */
126 public static function convertDomElementToArray(\DOMElement $element, $checkPrefix = true)
127 {
128 $prefix = (string) $element->prefix;
129 $empty = true;
130 $config = array();
131 foreach ($element->attributes as $name => $node) {
132 if ($checkPrefix && !in_array((string) $node->prefix, array('', $prefix), true)) {
133 continue;
134 }
135 $config[$name] = static::phpize($node->value);
136 $empty = false;
137 }
138
139 $nodeValue = false;
140 foreach ($element->childNodes as $node) {
141 if ($node instanceof \DOMText) {
142 if ('' !== trim($node->nodeValue)) {
143 $nodeValue = trim($node->nodeValue);
144 $empty = false;
145 }
146 } elseif ($checkPrefix && $prefix != (string) $node->prefix) {
147 continue;
148 } elseif (!$node instanceof \DOMComment) {
149 $value = static::convertDomElementToArray($node, $checkPrefix);
150
151 $key = $node->localName;
152 if (isset($config[$key])) {
153 if (!is_array($config[$key]) || !is_int(key($config[$key]))) {
154 $config[$key] = array($config[$key]);
155 }
156 $config[$key][] = $value;
157 } else {
158 $config[$key] = $value;
159 }
160
161 $empty = false;
162 }
163 }
164
165 if (false !== $nodeValue) {
166 $value = static::phpize($nodeValue);
167 if (count($config)) {
168 $config['value'] = $value;
169 } else {
170 $config = $value;
171 }
172 }
173
174 return !$empty ? $config : null;
175 }
176
177 /**
178 * Converts an xml value to a PHP type.
179 *
180 * @param mixed $value
181 *
182 * @return mixed
183 */
184 public static function phpize($value)
185 {
186 $value = (string) $value;
187 $lowercaseValue = strtolower($value);
188
189 switch (true) {
190 case 'null' === $lowercaseValue:
191 return;
192 case ctype_digit($value):
193 $raw = $value;
194 $cast = (int) $value;
195
196 return '0' == $value[0] ? octdec($value) : (((string) $raw === (string) $cast) ? $cast : $raw);
197 case isset($value[1]) && '-' === $value[0] && ctype_digit(substr($value, 1)):
198 $raw = $value;
199 $cast = (int) $value;
200
201 return '0' == $value[1] ? octdec($value) : (((string) $raw === (string) $cast) ? $cast : $raw);
202 case 'true' === $lowercaseValue:
203 return true;
204 case 'false' === $lowercaseValue:
205 return false;
206 case isset($value[1]) && '0b' == $value[0].$value[1]:
207 return bindec($value);
208 case is_numeric($value):
209 return '0x' === $value[0].$value[1] ? hexdec($value) : (float) $value;
210 case preg_match('/^0x[0-9a-f]++$/i', $value):
211 return hexdec($value);
212 case preg_match('/^(-|\+)?[0-9]+(\.[0-9]+)?$/', $value):
213 return (float) $value;
214 default:
215 return $value;
216 }
217 }
218
219 protected static function getXmlErrors($internalErrors)
220 {
221 $errors = array();
222 foreach (libxml_get_errors() as $error) {
223 $errors[] = sprintf('[%s %s] %s (in %s - line %d, column %d)',
224 LIBXML_ERR_WARNING == $error->level ? 'WARNING' : 'ERROR',
225 $error->code,
226 trim($error->message),
227 $error->file ?: 'n/a',
228 $error->line,
229 $error->column
230 );
231 }
232
233 libxml_clear_errors();
234 libxml_use_internal_errors($internalErrors);
235
236 return $errors;
237 }
238 }
239