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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) 2004-2012, 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 * @version 1.3.1 37 * @copyright 2004-2012 Ryan Parman, Geoffrey Sneddon, Ryan McCue 38 * @author Ryan Parman 39 * @author Geoffrey Sneddon 40 * @author Ryan McCue 41 * @link http://simplepie.org/ SimplePie 42 * @license http://www.opensource.org/licenses/bsd-license.php BSD License 43 */ 44 45 /** 46 * Used for data cleanup and post-processing 47 * 48 * 49 * This class can be overloaded with {@see SimplePie::set_sanitize_class()} 50 * 51 * @package SimplePie 52 * @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 53 */ 54 class SimplePie_Sanitize 55 { 56 // Private vars 57 var $base; 58 59 // Options 60 var $remove_div = true; 61 var $image_handler = ''; 62 var $strip_htmltags = array('base', 'blink', 'body', 'doctype', 'embed', 'font', 'form', 'frame', 'frameset', 'html', 'iframe', 'input', 'marquee', 'meta', 'noscript', 'object', 'param', 'script', 'style'); 63 var $encode_instead_of_strip = false; 64 var $strip_attributes = array('bgsound', 'class', 'expr', 'id', 'style', 'onclick', 'onerror', 'onfinish', 'onmouseover', 'onmouseout', 'onfocus', 'onblur', 'lowsrc', 'dynsrc'); 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', 'class', '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 $this->strip_attributes = false; 179 } 180 } 181 182 public function strip_comments($strip = false) 183 { 184 $this->strip_comments = (bool) $strip; 185 } 186 187 public function set_output_encoding($encoding = 'UTF-8') 188 { 189 $this->output_encoding = (string) $encoding; 190 } 191 192 /** 193 * Set element/attribute key/value pairs of HTML attributes 194 * containing URLs that need to be resolved relative to the feed 195 * 196 * Defaults to |a|@href, |area|@href, |blockquote|@cite, |del|@cite, 197 * |form|@action, |img|@longdesc, |img|@src, |input|@src, |ins|@cite, 198 * |q|@cite 199 * 200 * @since 1.0 201 * @param array|null $element_attribute Element/attribute key/value pairs, null for default 202 */ 203 public function set_url_replacements($element_attribute = null) 204 { 205 if ($element_attribute === null) 206 { 207 $element_attribute = array( 208 'a' => 'href', 209 'area' => 'href', 210 'blockquote' => 'cite', 211 'del' => 'cite', 212 'form' => 'action', 213 'img' => array( 214 'longdesc', 215 'src' 216 ), 217 'input' => 'src', 218 'ins' => 'cite', 219 'q' => 'cite' 220 ); 221 } 222 $this->replace_url_attributes = (array) $element_attribute; 223 } 224 225 public function sanitize($data, $type, $base = '') 226 { 227 $data = trim($data); 228 if ($data !== '' || $type & SIMPLEPIE_CONSTRUCT_IRI) 229 { 230 if ($type & SIMPLEPIE_CONSTRUCT_MAYBE_HTML) 231 { 232 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)) 233 { 234 $type |= SIMPLEPIE_CONSTRUCT_HTML; 235 } 236 else 237 { 238 $type |= SIMPLEPIE_CONSTRUCT_TEXT; 239 } 240 } 241 242 if ($type & SIMPLEPIE_CONSTRUCT_BASE64) 243 { 244 $data = base64_decode($data); 245 } 246 247 if ($type & (SIMPLEPIE_CONSTRUCT_HTML | SIMPLEPIE_CONSTRUCT_XHTML)) 248 { 249 250 if (!class_exists('DOMDocument')) 251 { 252 $this->registry->call('Misc', 'error', array('DOMDocument not found, unable to use sanitizer', E_USER_WARNING, __FILE__, __LINE__)); 253 return ''; 254 } 255 $document = new DOMDocument(); 256 $document->encoding = 'UTF-8'; 257 $data = $this->preprocess($data, $type); 258 259 set_error_handler(array('SimplePie_Misc', 'silence_errors')); 260 $document->loadHTML($data); 261 restore_error_handler(); 262 263 // Strip comments 264 if ($this->strip_comments) 265 { 266 $xpath = new DOMXPath($document); 267 $comments = $xpath->query('//comment()'); 268 269 foreach ($comments as $comment) 270 { 271 $comment->parentNode->removeChild($comment); 272 } 273 } 274 275 // Strip out HTML tags and attributes that might cause various security problems. 276 // Based on recommendations by Mark Pilgrim at: 277 // http://diveintomark.org/archives/2003/06/12/how_to_consume_rss_safely 278 if ($this->strip_htmltags) 279 { 280 foreach ($this->strip_htmltags as $tag) 281 { 282 $this->strip_tag($tag, $document, $type); 283 } 284 } 285 286 if ($this->strip_attributes) 287 { 288 foreach ($this->strip_attributes as $attrib) 289 { 290 $this->strip_attr($attrib, $document); 291 } 292 } 293 294 // Replace relative URLs 295 $this->base = $base; 296 foreach ($this->replace_url_attributes as $element => $attributes) 297 { 298 $this->replace_urls($document, $element, $attributes); 299 } 300 301 // If image handling (caching, etc.) is enabled, cache and rewrite all the image tags. 302 if (isset($this->image_handler) && ((string) $this->image_handler) !== '' && $this->enable_cache) 303 { 304 $images = $document->getElementsByTagName('img'); 305 foreach ($images as $img) 306 { 307 if ($img->hasAttribute('src')) 308 { 309 $image_url = call_user_func($this->cache_name_function, $img->getAttribute('src')); 310 $cache = $this->registry->call('Cache', 'get_handler', array($this->cache_location, $image_url, 'spi')); 311 312 if ($cache->load()) 313 { 314 $img->setAttribute('src', $this->image_handler . $image_url); 315 } 316 else 317 { 318 $file = $this->registry->create('File', array($img->getAttribute('src'), $this->timeout, 5, array('X-FORWARDED-FOR' => $_SERVER['REMOTE_ADDR']), $this->useragent, $this->force_fsockopen)); 319 $headers = $file->headers; 320 321 if ($file->success && ($file->method & SIMPLEPIE_FILE_SOURCE_REMOTE === 0 || ($file->status_code === 200 || $file->status_code > 206 && $file->status_code < 300))) 322 { 323 if ($cache->save(array('headers' => $file->headers, 'body' => $file->body))) 324 { 325 $img->setAttribute('src', $this->image_handler . $image_url); 326 } 327 else 328 { 329 trigger_error("$this->cache_location is not writeable. Make sure you've set the correct relative or absolute path, and that the location is server-writable.", E_USER_WARNING); 330 } 331 } 332 } 333 } 334 } 335 } 336 337 // Remove the DOCTYPE 338 // Seems to cause segfaulting if we don't do this 339 if ($document->firstChild instanceof DOMDocumentType) 340 { 341 $document->removeChild($document->firstChild); 342 } 343 344 // Move everything from the body to the root 345 $real_body = $document->getElementsByTagName('body')->item(0)->childNodes->item(0); 346 $document->replaceChild($real_body, $document->firstChild); 347 348 // Finally, convert to a HTML string 349 $data = trim($document->saveHTML()); 350 351 if ($this->remove_div) 352 { 353 $data = preg_replace('/^<div' . SIMPLEPIE_PCRE_XML_ATTRIBUTE . '>/', '', $data); 354 $data = preg_replace('/<\/div>$/', '', $data); 355 } 356 else 357 { 358 $data = preg_replace('/^<div' . SIMPLEPIE_PCRE_XML_ATTRIBUTE . '>/', '<div>', $data); 359 } 360 } 361 362 if ($type & SIMPLEPIE_CONSTRUCT_IRI) 363 { 364 $absolute = $this->registry->call('Misc', 'absolutize_url', array($data, $base)); 365 if ($absolute !== false) 366 { 367 $data = $absolute; 368 } 369 } 370 371 if ($type & (SIMPLEPIE_CONSTRUCT_TEXT | SIMPLEPIE_CONSTRUCT_IRI)) 372 { 373 $data = htmlspecialchars($data, ENT_COMPAT, 'UTF-8'); 374 } 375 376 if ($this->output_encoding !== 'UTF-8') 377 { 378 $data = $this->registry->call('Misc', 'change_encoding', array($data, 'UTF-8', $this->output_encoding)); 379 } 380 } 381 return $data; 382 } 383 384 protected function preprocess($html, $type) 385 { 386 $ret = ''; 387 if ($type & ~SIMPLEPIE_CONSTRUCT_XHTML) 388 { 389 // Atom XHTML constructs are wrapped with a div by default 390 // Note: No protection if $html contains a stray </div>! 391 $html = '<div>' . $html . '</div>'; 392 $ret .= '<!DOCTYPE html>'; 393 $content_type = 'text/html'; 394 } 395 else 396 { 397 $ret .= '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">'; 398 $content_type = 'application/xhtml+xml'; 399 } 400 401 $ret .= '<html><head>'; 402 $ret .= '<meta http-equiv="Content-Type" content="' . $content_type . '; charset=utf-8" />'; 403 $ret .= '</head><body>' . $html . '</body></html>'; 404 return $ret; 405 } 406 407 public function replace_urls($document, $tag, $attributes) 408 { 409 if (!is_array($attributes)) 410 { 411 $attributes = array($attributes); 412 } 413 414 if (!is_array($this->strip_htmltags) || !in_array($tag, $this->strip_htmltags)) 415 { 416 $elements = $document->getElementsByTagName($tag); 417 foreach ($elements as $element) 418 { 419 foreach ($attributes as $attribute) 420 { 421 if ($element->hasAttribute($attribute)) 422 { 423 $value = $this->registry->call('Misc', 'absolutize_url', array($element->getAttribute($attribute), $this->base)); 424 if ($value !== false) 425 { 426 $element->setAttribute($attribute, $value); 427 } 428 } 429 } 430 } 431 } 432 } 433 434 public function do_strip_htmltags($match) 435 { 436 if ($this->encode_instead_of_strip) 437 { 438 if (isset($match[4]) && !in_array(strtolower($match[1]), array('script', 'style'))) 439 { 440 $match[1] = htmlspecialchars($match[1], ENT_COMPAT, 'UTF-8'); 441 $match[2] = htmlspecialchars($match[2], ENT_COMPAT, 'UTF-8'); 442 return "<$match[1]$match[2]>$match[3]</$match[1]>"; 443 } 444 else 445 { 446 return htmlspecialchars($match[0], ENT_COMPAT, 'UTF-8'); 447 } 448 } 449 elseif (isset($match[4]) && !in_array(strtolower($match[1]), array('script', 'style'))) 450 { 451 return $match[4]; 452 } 453 else 454 { 455 return ''; 456 } 457 } 458 459 protected function strip_tag($tag, $document, $type) 460 { 461 $xpath = new DOMXPath($document); 462 $elements = $xpath->query('body//' . $tag); 463 if ($this->encode_instead_of_strip) 464 { 465 foreach ($elements as $element) 466 { 467 $fragment = $document->createDocumentFragment(); 468 469 // For elements which aren't script or style, include the tag itself 470 if (!in_array($tag, array('script', 'style'))) 471 { 472 $text = '<' . $tag; 473 if ($element->hasAttributes()) 474 { 475 $attrs = array(); 476 foreach ($element->attributes as $name => $attr) 477 { 478 $value = $attr->value; 479 480 // In XHTML, empty values should never exist, so we repeat the value 481 if (empty($value) && ($type & SIMPLEPIE_CONSTRUCT_XHTML)) 482 { 483 $value = $name; 484 } 485 // For HTML, empty is fine 486 elseif (empty($value) && ($type & SIMPLEPIE_CONSTRUCT_HTML)) 487 { 488 $attrs[] = $name; 489 continue; 490 } 491 492 // Standard attribute text 493 $attrs[] = $name . '="' . $attr->value . '"'; 494 } 495 $text .= ' ' . implode(' ', $attrs); 496 } 497 $text .= '>'; 498 $fragment->appendChild(new DOMText($text)); 499 } 500 501 $number = $element->childNodes->length; 502 for ($i = $number; $i > 0; $i--) 503 { 504 $child = $element->childNodes->item(0); 505 $fragment->appendChild($child); 506 } 507 508 if (!in_array($tag, array('script', 'style'))) 509 { 510 $fragment->appendChild(new DOMText('</' . $tag . '>')); 511 } 512 513 $element->parentNode->replaceChild($fragment, $element); 514 } 515 516 return; 517 } 518 elseif (in_array($tag, array('script', 'style'))) 519 { 520 foreach ($elements as $element) 521 { 522 $element->parentNode->removeChild($element); 523 } 524 525 return; 526 } 527 else 528 { 529 foreach ($elements as $element) 530 { 531 $fragment = $document->createDocumentFragment(); 532 $number = $element->childNodes->length; 533 for ($i = $number; $i > 0; $i--) 534 { 535 $child = $element->childNodes->item(0); 536 $fragment->appendChild($child); 537 } 538 539 $element->parentNode->replaceChild($fragment, $element); 540 } 541 } 542 } 543 544 protected function strip_attr($attrib, $document) 545 { 546 $xpath = new DOMXPath($document); 547 $elements = $xpath->query('//*[@' . $attrib . ']'); 548 549 foreach ($elements as $element) 550 { 551 $element->removeAttribute($attrib); 552 } 553 } 554 }
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| Generated: Tue Mar 25 01:41:18 2014 | WordPress honlapkészítés: online1.hu |