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Differences Between: [Versions 39 and 311] [Versions 39 and 400] [Versions 39 and 401] [Versions 39 and 402] [Versions 39 and 403]

   1  <?php
   2  /**
   3   * SimplePie
   4   *
   5   * A PHP-Based RSS and Atom Feed Framework.
   6   * Takes the hard work out of managing a complete RSS/Atom solution.
   7   *
   8   * Copyright (c) 2004-2016, Ryan Parman, Geoffrey Sneddon, Ryan McCue, and contributors
   9   * All rights reserved.
  10   *
  11   * Redistribution and use in source and binary forms, with or without modification, are
  12   * permitted provided that the following conditions are met:
  13   *
  14   * 	 * Redistributions of source code must retain the above copyright notice, this list of
  15   * 	   conditions and the following disclaimer.
  16   *
  17   * 	 * Redistributions in binary form must reproduce the above copyright notice, this list
  18   * 	   of conditions and the following disclaimer in the documentation and/or other materials
  19   * 	   provided with the distribution.
  20   *
  21   * 	 * Neither the name of the SimplePie Team nor the names of its contributors may be used
  22   * 	   to endorse or promote products derived from this software without specific prior
  23   * 	   written permission.
  24   *
  25   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
  26   * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
  27   * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS
  28   * AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  29   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  30   * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  31   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  32   * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  33   * POSSIBILITY OF SUCH DAMAGE.
  34   *
  35   * @package SimplePie
  36   * @copyright 2004-2016 Ryan Parman, Geoffrey Sneddon, Ryan McCue
  37   * @author Ryan Parman
  38   * @author Geoffrey Sneddon
  39   * @author Ryan McCue
  40   * @link http://simplepie.org/ SimplePie
  41   * @license http://www.opensource.org/licenses/bsd-license.php BSD License
  42   */
  43  
  44  /**
  45   * Used for data cleanup and post-processing
  46   *
  47   *
  48   * This class can be overloaded with {@see SimplePie::set_sanitize_class()}
  49   *
  50   * @package SimplePie
  51   * @todo Move to using an actual HTML parser (this will allow tags to be properly stripped, and to switch between HTML and XHTML), this will also make it easier to shorten a string while preserving HTML tags
  52   */
  53  class SimplePie_Sanitize
  54  {
  55  	 // Private vars
  56  	 var $base;
  57  
  58  	 // Options
  59  	 var $remove_div = true;
  60  	 var $image_handler = '';
  61  	 var $strip_htmltags = array('base', 'blink', 'body', 'doctype', 'embed', 'font', 'form', 'frame', 'frameset', 'html', 'iframe', 'input', 'marquee', 'meta', 'noscript', 'object', 'param', 'script', 'style');
  62  	 var $encode_instead_of_strip = false;
  63  	 var $strip_attributes = array('bgsound', 'expr', 'id', 'style', 'onclick', 'onerror', 'onfinish', 'onmouseover', 'onmouseout', 'onfocus', 'onblur', 'lowsrc', 'dynsrc');
  64  	 var $add_attributes = array('audio' => array('preload' => 'none'), 'iframe' => array('sandbox' => 'allow-scripts allow-same-origin'), 'video' => array('preload' => 'none'));
  65  	 var $strip_comments = false;
  66  	 var $output_encoding = 'UTF-8';
  67  	 var $enable_cache = true;
  68  	 var $cache_location = './cache';
  69  	 var $cache_name_function = 'md5';
  70  	 var $timeout = 10;
  71  	 var $useragent = '';
  72  	 var $force_fsockopen = false;
  73  	 var $replace_url_attributes = null;
  74  
  75  	public function __construct()
  76  	 {
  77  	 	 // Set defaults
  78  	 	 $this->set_url_replacements(null);
  79  	 }
  80  
  81  	public function remove_div($enable = true)
  82  	 {
  83  	 	 $this->remove_div = (bool) $enable;
  84  	 }
  85  
  86  	public function set_image_handler($page = false)
  87  	 {
  88  	 	 if ($page)
  89  	 	 {
  90  	 	 	 $this->image_handler = (string) $page;
  91  	 	 }
  92  	 	 else
  93  	 	 {
  94  	 	 	 $this->image_handler = false;
  95  	 	 }
  96  	 }
  97  
  98  	public function set_registry(SimplePie_Registry $registry)
  99  	 {
 100  	 	 $this->registry = $registry;
 101  	 }
 102  
 103  	public function pass_cache_data($enable_cache = true, $cache_location = './cache', $cache_name_function = 'md5', $cache_class = 'SimplePie_Cache')
 104  	 {
 105  	 	 if (isset($enable_cache))
 106  	 	 {
 107  	 	 	 $this->enable_cache = (bool) $enable_cache;
 108  	 	 }
 109  
 110  	 	 if ($cache_location)
 111  	 	 {
 112  	 	 	 $this->cache_location = (string) $cache_location;
 113  	 	 }
 114  
 115  	 	 if ($cache_name_function)
 116  	 	 {
 117  	 	 	 $this->cache_name_function = (string) $cache_name_function;
 118  	 	 }
 119  	 }
 120  
 121  	public function pass_file_data($file_class = 'SimplePie_File', $timeout = 10, $useragent = '', $force_fsockopen = false)
 122  	 {
 123  	 	 if ($timeout)
 124  	 	 {
 125  	 	 	 $this->timeout = (string) $timeout;
 126  	 	 }
 127  
 128  	 	 if ($useragent)
 129  	 	 {
 130  	 	 	 $this->useragent = (string) $useragent;
 131  	 	 }
 132  
 133  	 	 if ($force_fsockopen)
 134  	 	 {
 135  	 	 	 $this->force_fsockopen = (string) $force_fsockopen;
 136  	 	 }
 137  	 }
 138  
 139  	public function strip_htmltags($tags = array('base', 'blink', 'body', 'doctype', 'embed', 'font', 'form', 'frame', 'frameset', 'html', 'iframe', 'input', 'marquee', 'meta', 'noscript', 'object', 'param', 'script', 'style'))
 140  	 {
 141  	 	 if ($tags)
 142  	 	 {
 143  	 	 	 if (is_array($tags))
 144  	 	 	 {
 145  	 	 	 	 $this->strip_htmltags = $tags;
 146  	 	 	 }
 147  	 	 	 else
 148  	 	 	 {
 149  	 	 	 	 $this->strip_htmltags = explode(',', $tags);
 150  	 	 	 }
 151  	 	 }
 152  	 	 else
 153  	 	 {
 154  	 	 	 $this->strip_htmltags = false;
 155  	 	 }
 156  	 }
 157  
 158  	public function encode_instead_of_strip($encode = false)
 159  	 {
 160  	 	 $this->encode_instead_of_strip = (bool) $encode;
 161  	 }
 162  
 163  	public function strip_attributes($attribs = array('bgsound', 'expr', 'id', 'style', 'onclick', 'onerror', 'onfinish', 'onmouseover', 'onmouseout', 'onfocus', 'onblur', 'lowsrc', 'dynsrc'))
 164  	 {
 165  	 	 if ($attribs)
 166  	 	 {
 167  	 	 	 if (is_array($attribs))
 168  	 	 	 {
 169  	 	 	 	 $this->strip_attributes = $attribs;
 170  	 	 	 }
 171  	 	 	 else
 172  	 	 	 {
 173  	 	 	 	 $this->strip_attributes = explode(',', $attribs);
 174  	 	 	 }
 175  	 	 }
 176  	 	 else
 177  	 	 {
 178  	 	 	 $this->strip_attributes = false;
 179  	 	 }
 180  	 }
 181  
 182  	public function add_attributes($attribs = array('audio' => array('preload' => 'none'), 'iframe' => array('sandbox' => 'allow-scripts allow-same-origin'), 'video' => array('preload' => 'none')))
 183  	 {
 184  	 	 if ($attribs)
 185  	 	 {
 186  	 	 	 if (is_array($attribs))
 187  	 	 	 {
 188  	 	 	 	 $this->add_attributes = $attribs;
 189  	 	 	 }
 190  	 	 	 else
 191  	 	 	 {
 192  	 	 	 	 $this->add_attributes = explode(',', $attribs);
 193  	 	 	 }
 194  	 	 }
 195  	 	 else
 196  	 	 {
 197  	 	 	 $this->add_attributes = false;
 198  	 	 }
 199  	 }
 200  
 201  	public function strip_comments($strip = false)
 202  	 {
 203  	 	 $this->strip_comments = (bool) $strip;
 204  	 }
 205  
 206  	public function set_output_encoding($encoding = 'UTF-8')
 207  	 {
 208  	 	 $this->output_encoding = (string) $encoding;
 209  	 }
 210  
 211  	 /**
 212  	  * Set element/attribute key/value pairs of HTML attributes
 213  	  * containing URLs that need to be resolved relative to the feed
 214  	  *
 215  	  * Defaults to |a|@href, |area|@href, |blockquote|@cite, |del|@cite,
 216  	  * |form|@action, |img|@longdesc, |img|@src, |input|@src, |ins|@cite,
 217  	  * |q|@cite
 218  	  *
 219  	  * @since 1.0
 220  	  * @param array|null $element_attribute Element/attribute key/value pairs, null for default
 221  	  */
 222  	public function set_url_replacements($element_attribute = null)
 223  	 {
 224  	 	 if ($element_attribute === null)
 225  	 	 {
 226  	 	 	 $element_attribute = array(
 227  	 	 	 	 'a' => 'href',
 228  	 	 	 	 'area' => 'href',
 229  	 	 	 	 'blockquote' => 'cite',
 230  	 	 	 	 'del' => 'cite',
 231  	 	 	 	 'form' => 'action',
 232  	 	 	 	 'img' => array(
 233  	 	 	 	 	 'longdesc',
 234  	 	 	 	 	 'src'
 235  	 	 	 	 ),
 236  	 	 	 	 'input' => 'src',
 237  	 	 	 	 'ins' => 'cite',
 238  	 	 	 	 'q' => 'cite'
 239  	 	 	 );
 240  	 	 }
 241  	 	 $this->replace_url_attributes = (array) $element_attribute;
 242  	 }
 243  
 244  	public function sanitize($data, $type, $base = '')
 245  	 {
 246  	 	 $data = trim($data);
 247  	 	 if ($data !== '' || $type & SIMPLEPIE_CONSTRUCT_IRI)
 248  	 	 {
 249  	 	 	 if ($type & SIMPLEPIE_CONSTRUCT_MAYBE_HTML)
 250  	 	 	 {
 251  	 	 	 	 if (preg_match('/(&(#(x[0-9a-fA-F]+|[0-9]+)|[a-zA-Z0-9]+)|<\/[A-Za-z][^\x09\x0A\x0B\x0C\x0D\x20\x2F\x3E]*' . SIMPLEPIE_PCRE_HTML_ATTRIBUTE . '>)/', $data))
 252  	 	 	 	 {
 253  	 	 	 	 	 $type |= SIMPLEPIE_CONSTRUCT_HTML;
 254  	 	 	 	 }
 255  	 	 	 	 else
 256  	 	 	 	 {
 257  	 	 	 	 	 $type |= SIMPLEPIE_CONSTRUCT_TEXT;
 258  	 	 	 	 }
 259  	 	 	 }
 260  
 261  	 	 	 if ($type & SIMPLEPIE_CONSTRUCT_BASE64)
 262  	 	 	 {
 263  	 	 	 	 $data = base64_decode($data);
 264  	 	 	 }
 265  
 266  	 	 	 if ($type & (SIMPLEPIE_CONSTRUCT_HTML | SIMPLEPIE_CONSTRUCT_XHTML))
 267  	 	 	 {
 268  
 269  	 	 	 	 if (!class_exists('DOMDocument'))
 270  	 	 	 	 {
 271  	 	 	 	 	 throw new SimplePie_Exception('DOMDocument not found, unable to use sanitizer');
 272  	 	 	 	 }
 273  	 	 	 	 $document = new DOMDocument();
 274  	 	 	 	 $document->encoding = 'UTF-8';
 275  
 276  	 	 	 	 $data = $this->preprocess($data, $type);
 277  
 278  	 	 	 	 set_error_handler(array('SimplePie_Misc', 'silence_errors'));
 279  	 	 	 	 $document->loadHTML($data);
 280  	 	 	 	 restore_error_handler();
 281  
 282  	 	 	 	 $xpath = new DOMXPath($document);
 283  
 284  	 	 	 	 // Strip comments
 285  	 	 	 	 if ($this->strip_comments)
 286  	 	 	 	 {
 287  	 	 	 	 	 $comments = $xpath->query('//comment()');
 288  
 289  	 	 	 	 	 foreach ($comments as $comment)
 290  	 	 	 	 	 {
 291  	 	 	 	 	 	 $comment->parentNode->removeChild($comment);
 292  	 	 	 	 	 }
 293  	 	 	 	 }
 294  
 295  	 	 	 	 // Strip out HTML tags and attributes that might cause various security problems.
 296  	 	 	 	 // Based on recommendations by Mark Pilgrim at:
 297  	 	 	 	 // http://diveintomark.org/archives/2003/06/12/how_to_consume_rss_safely
 298  	 	 	 	 if ($this->strip_htmltags)
 299  	 	 	 	 {
 300  	 	 	 	 	 foreach ($this->strip_htmltags as $tag)
 301  	 	 	 	 	 {
 302  	 	 	 	 	 	 $this->strip_tag($tag, $document, $xpath, $type);
 303  	 	 	 	 	 }
 304  	 	 	 	 }
 305  
 306  	 	 	 	 if ($this->strip_attributes)
 307  	 	 	 	 {
 308  	 	 	 	 	 foreach ($this->strip_attributes as $attrib)
 309  	 	 	 	 	 {
 310  	 	 	 	 	 	 $this->strip_attr($attrib, $xpath);
 311  	 	 	 	 	 }
 312  	 	 	 	 }
 313  
 314  	 	 	 	 if ($this->add_attributes)
 315  	 	 	 	 {
 316  	 	 	 	 	 foreach ($this->add_attributes as $tag => $valuePairs)
 317  	 	 	 	 	 {
 318  	 	 	 	 	 	 $this->add_attr($tag, $valuePairs, $document);
 319  	 	 	 	 	 }
 320  	 	 	 	 }
 321  
 322  	 	 	 	 // Replace relative URLs
 323  	 	 	 	 $this->base = $base;
 324  	 	 	 	 foreach ($this->replace_url_attributes as $element => $attributes)
 325  	 	 	 	 {
 326  	 	 	 	 	 $this->replace_urls($document, $element, $attributes);
 327  	 	 	 	 }
 328  
 329  	 	 	 	 // If image handling (caching, etc.) is enabled, cache and rewrite all the image tags.
 330  	 	 	 	 if (isset($this->image_handler) && ((string) $this->image_handler) !== '' && $this->enable_cache)
 331  	 	 	 	 {
 332  	 	 	 	 	 $images = $document->getElementsByTagName('img');
 333  	 	 	 	 	 foreach ($images as $img)
 334  	 	 	 	 	 {
 335  	 	 	 	 	 	 if ($img->hasAttribute('src'))
 336  	 	 	 	 	 	 {
 337  	 	 	 	 	 	 	 $image_url = call_user_func($this->cache_name_function, $img->getAttribute('src'));
 338  	 	 	 	 	 	 	 $cache = $this->registry->call('Cache', 'get_handler', array($this->cache_location, $image_url, 'spi'));
 339  
 340  	 	 	 	 	 	 	 if ($cache->load())
 341  	 	 	 	 	 	 	 {
 342  	 	 	 	 	 	 	 	 $img->setAttribute('src', $this->image_handler . $image_url);
 343  	 	 	 	 	 	 	 }
 344  	 	 	 	 	 	 	 else
 345  	 	 	 	 	 	 	 {
 346  	 	 	 	 	 	 	 	 $file = $this->registry->create('File', array($img->getAttribute('src'), $this->timeout, 5, array('X-FORWARDED-FOR' => $_SERVER['REMOTE_ADDR']), $this->useragent, $this->force_fsockopen));
 347  	 	 	 	 	 	 	 	 $headers = $file->headers;
 348  
 349  	 	 	 	 	 	 	 	 if ($file->success && ($file->method & SIMPLEPIE_FILE_SOURCE_REMOTE === 0 || ($file->status_code === 200 || $file->status_code > 206 && $file->status_code < 300)))
 350  	 	 	 	 	 	 	 	 {
 351  	 	 	 	 	 	 	 	 	 if ($cache->save(array('headers' => $file->headers, 'body' => $file->body)))
 352  	 	 	 	 	 	 	 	 	 {
 353  	 	 	 	 	 	 	 	 	 	 $img->setAttribute('src', $this->image_handler . $image_url);
 354  	 	 	 	 	 	 	 	 	 }
 355  	 	 	 	 	 	 	 	 	 else
 356  	 	 	 	 	 	 	 	 	 {
 357  	 	 	 	 	 	 	 	 	 	 trigger_error("$this->cache_location is not writable. Make sure you've set the correct relative or absolute path, and that the location is server-writable.", E_USER_WARNING);
 358  	 	 	 	 	 	 	 	 	 }
 359  	 	 	 	 	 	 	 	 }
 360  	 	 	 	 	 	 	 }
 361  	 	 	 	 	 	 }
 362  	 	 	 	 	 }
 363  	 	 	 	 }
 364  
 365  	 	 	 	 // Get content node
 366  	 	 	 	 $div = $document->getElementsByTagName('body')->item(0)->firstChild;
 367  	 	 	 	 // Finally, convert to a HTML string
 368  	 	 	 	 if (version_compare(PHP_VERSION, '5.3.6', '>='))
 369  	 	 	 	 {
 370  	 	 	 	 	 $data = trim($document->saveHTML($div));
 371  	 	 	 	 }
 372  	 	 	 	 else
 373  	 	 	 	 {
 374  	 	 	 	 	 $data = trim($document->saveXML($div));
 375  	 	 	 	 }
 376  
 377  	 	 	 	 if ($this->remove_div)
 378  	 	 	 	 {
 379  	 	 	 	 	 $data = preg_replace('/^<div' . SIMPLEPIE_PCRE_XML_ATTRIBUTE . '>/', '', $data);
 380  	 	 	 	 	 $data = preg_replace('/<\/div>$/', '', $data);
 381  	 	 	 	 }
 382  	 	 	 	 else
 383  	 	 	 	 {
 384  	 	 	 	 	 $data = preg_replace('/^<div' . SIMPLEPIE_PCRE_XML_ATTRIBUTE . '>/', '<div>', $data);
 385  	 	 	 	 }
 386  	 	 	 }
 387  
 388  	 	 	 if ($type & SIMPLEPIE_CONSTRUCT_IRI)
 389  	 	 	 {
 390  	 	 	 	 $absolute = $this->registry->call('Misc', 'absolutize_url', array($data, $base));
 391  	 	 	 	 if ($absolute !== false)
 392  	 	 	 	 {
 393  	 	 	 	 	 $data = $absolute;
 394  	 	 	 	 }
 395  	 	 	 }
 396  
 397  	 	 	 if ($type & (SIMPLEPIE_CONSTRUCT_TEXT | SIMPLEPIE_CONSTRUCT_IRI))
 398  	 	 	 {
 399  	 	 	 	 $data = htmlspecialchars($data, ENT_COMPAT, 'UTF-8');
 400  	 	 	 }
 401  
 402  	 	 	 if ($this->output_encoding !== 'UTF-8')
 403  	 	 	 {
 404  	 	 	 	 $data = $this->registry->call('Misc', 'change_encoding', array($data, 'UTF-8', $this->output_encoding));
 405  	 	 	 }
 406  	 	 }
 407  	 	 return $data;
 408  	 }
 409  
 410  	protected function preprocess($html, $type)
 411  	 {
 412  	 	 $ret = '';
 413  	 	 $html = preg_replace('%</?(?:html|body)[^>]*?'.'>%is', '', $html);
 414  	 	 if ($type & ~SIMPLEPIE_CONSTRUCT_XHTML)
 415  	 	 {
 416  	 	 	 // Atom XHTML constructs are wrapped with a div by default
 417  	 	 	 // Note: No protection if $html contains a stray </div>!
 418  	 	 	 $html = '<div>' . $html . '</div>';
 419  	 	 	 $ret .= '<!DOCTYPE html>';
 420  	 	 	 $content_type = 'text/html';
 421  	 	 }
 422  	 	 else
 423  	 	 {
 424  	 	 	 $ret .= '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">';
 425  	 	 	 $content_type = 'application/xhtml+xml';
 426  	 	 }
 427  
 428  	 	 $ret .= '<html><head>';
 429  	 	 $ret .= '<meta http-equiv="Content-Type" content="' . $content_type . '; charset=utf-8" />';
 430  	 	 $ret .= '</head><body>' . $html . '</body></html>';
 431  	 	 return $ret;
 432  	 }
 433  
 434  	public function replace_urls($document, $tag, $attributes)
 435  	 {
 436  	 	 if (!is_array($attributes))
 437  	 	 {
 438  	 	 	 $attributes = array($attributes);
 439  	 	 }
 440  
 441  	 	 if (!is_array($this->strip_htmltags) || !in_array($tag, $this->strip_htmltags))
 442  	 	 {
 443  	 	 	 $elements = $document->getElementsByTagName($tag);
 444  	 	 	 foreach ($elements as $element)
 445  	 	 	 {
 446  	 	 	 	 foreach ($attributes as $attribute)
 447  	 	 	 	 {
 448  	 	 	 	 	 if ($element->hasAttribute($attribute))
 449  	 	 	 	 	 {
 450  	 	 	 	 	 	 $value = $this->registry->call('Misc', 'absolutize_url', array($element->getAttribute($attribute), $this->base));
 451  	 	 	 	 	 	 if ($value !== false)
 452  	 	 	 	 	 	 {
 453  	 	 	 	 	 	 	 $element->setAttribute($attribute, $value);
 454  	 	 	 	 	 	 }
 455  	 	 	 	 	 }
 456  	 	 	 	 }
 457  	 	 	 }
 458  	 	 }
 459  	 }
 460  
 461  	public function do_strip_htmltags($match)
 462  	 {
 463  	 	 if ($this->encode_instead_of_strip)
 464  	 	 {
 465  	 	 	 if (isset($match[4]) && !in_array(strtolower($match[1]), array('script', 'style')))
 466  	 	 	 {
 467  	 	 	 	 $match[1] = htmlspecialchars($match[1], ENT_COMPAT, 'UTF-8');
 468  	 	 	 	 $match[2] = htmlspecialchars($match[2], ENT_COMPAT, 'UTF-8');
 469  	 	 	 	 return "&lt;$match[1]$match[2]&gt;$match[3]&lt;/$match[1]&gt;";
 470  	 	 	 }
 471  	 	 	 else
 472  	 	 	 {
 473  	 	 	 	 return htmlspecialchars($match[0], ENT_COMPAT, 'UTF-8');
 474  	 	 	 }
 475  	 	 }
 476  	 	 elseif (isset($match[4]) && !in_array(strtolower($match[1]), array('script', 'style')))
 477  	 	 {
 478  	 	 	 return $match[4];
 479  	 	 }
 480  	 	 else
 481  	 	 {
 482  	 	 	 return '';
 483  	 	 }
 484  	 }
 485  
 486  	protected function strip_tag($tag, $document, $xpath, $type)
 487  	 {
 488  	 	 $elements = $xpath->query('body//' . $tag);
 489  	 	 if ($this->encode_instead_of_strip)
 490  	 	 {
 491  	 	 	 foreach ($elements as $element)
 492  	 	 	 {
 493  	 	 	 	 $fragment = $document->createDocumentFragment();
 494  
 495  	 	 	 	 // For elements which aren't script or style, include the tag itself
 496  	 	 	 	 if (!in_array($tag, array('script', 'style')))
 497  	 	 	 	 {
 498  	 	 	 	 	 $text = '<' . $tag;
 499  	 	 	 	 	 if ($element->hasAttributes())
 500  	 	 	 	 	 {
 501  	 	 	 	 	 	 $attrs = array();
 502  	 	 	 	 	 	 foreach ($element->attributes as $name => $attr)
 503  	 	 	 	 	 	 {
 504  	 	 	 	 	 	 	 $value = $attr->value;
 505  
 506  	 	 	 	 	 	 	 // In XHTML, empty values should never exist, so we repeat the value
 507  	 	 	 	 	 	 	 if (empty($value) && ($type & SIMPLEPIE_CONSTRUCT_XHTML))
 508  	 	 	 	 	 	 	 {
 509  	 	 	 	 	 	 	 	 $value = $name;
 510  	 	 	 	 	 	 	 }
 511  	 	 	 	 	 	 	 // For HTML, empty is fine
 512  	 	 	 	 	 	 	 elseif (empty($value) && ($type & SIMPLEPIE_CONSTRUCT_HTML))
 513  	 	 	 	 	 	 	 {
 514  	 	 	 	 	 	 	 	 $attrs[] = $name;
 515  	 	 	 	 	 	 	 	 continue;
 516  	 	 	 	 	 	 	 }
 517  
 518  	 	 	 	 	 	 	 // Standard attribute text
 519  	 	 	 	 	 	 	 $attrs[] = $name . '="' . $attr->value . '"';
 520  	 	 	 	 	 	 }
 521  	 	 	 	 	 	 $text .= ' ' . implode(' ', $attrs);
 522  	 	 	 	 	 }
 523  	 	 	 	 	 $text .= '>';
 524  	 	 	 	 	 $fragment->appendChild(new DOMText($text));
 525  	 	 	 	 }
 526  
 527  	 	 	 	 $number = $element->childNodes->length;
 528  	 	 	 	 for ($i = $number; $i > 0; $i--)
 529  	 	 	 	 {
 530  	 	 	 	 	 $child = $element->childNodes->item(0);
 531  	 	 	 	 	 $fragment->appendChild($child);
 532  	 	 	 	 }
 533  
 534  	 	 	 	 if (!in_array($tag, array('script', 'style')))
 535  	 	 	 	 {
 536  	 	 	 	 	 $fragment->appendChild(new DOMText('</' . $tag . '>'));
 537  	 	 	 	 }
 538  
 539  	 	 	 	 $element->parentNode->replaceChild($fragment, $element);
 540  	 	 	 }
 541  
 542  	 	 	 return;
 543  	 	 }
 544  	 	 elseif (in_array($tag, array('script', 'style')))
 545  	 	 {
 546  	 	 	 foreach ($elements as $element)
 547  	 	 	 {
 548  	 	 	 	 $element->parentNode->removeChild($element);
 549  	 	 	 }
 550  
 551  	 	 	 return;
 552  	 	 }
 553  	 	 else
 554  	 	 {
 555  	 	 	 foreach ($elements as $element)
 556  	 	 	 {
 557  	 	 	 	 $fragment = $document->createDocumentFragment();
 558  	 	 	 	 $number = $element->childNodes->length;
 559  	 	 	 	 for ($i = $number; $i > 0; $i--)
 560  	 	 	 	 {
 561  	 	 	 	 	 $child = $element->childNodes->item(0);
 562  	 	 	 	 	 $fragment->appendChild($child);
 563  	 	 	 	 }
 564  
 565  	 	 	 	 $element->parentNode->replaceChild($fragment, $element);
 566  	 	 	 }
 567  	 	 }
 568  	 }
 569  
 570  	protected function strip_attr($attrib, $xpath)
 571  	 {
 572  	 	 $elements = $xpath->query('//*[@' . $attrib . ']');
 573  
 574  	 	 foreach ($elements as $element)
 575  	 	 {
 576  	 	 	 $element->removeAttribute($attrib);
 577  	 	 }
 578  	 }
 579  
 580  	 protected function add_attr($tag, $valuePairs, $document)
 581  	 {
 582  	 	 $elements = $document->getElementsByTagName($tag);
 583  	 	 foreach ($elements as $element)
 584  	 	 {
 585  	 	 	 foreach ($valuePairs as $attrib => $value)
 586  	 	 	 {
 587  	 	 	 	 $element->setAttribute($attrib, $value);
 588  	 	 	 }
 589  	 	 }
 590  	 }
 591  }