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/wp-includes/SimplePie/Locator.php

https://bitbucket.org/theshipswakecreative/psw
PHP | 372 lines | 292 code | 30 blank | 50 comment | 69 complexity | 8073a4c6da1bb33b877576665ef5eab5 MD5 | raw file
Possible License(s): LGPL-3.0, Apache-2.0
  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. * Used for feed auto-discovery
  46. *
  47. *
  48. * This class can be overloaded with {@see SimplePie::set_locator_class()}
  49. *
  50. * @package SimplePie
  51. */
  52. class SimplePie_Locator
  53. {
  54. var $useragent;
  55. var $timeout;
  56. var $file;
  57. var $local = array();
  58. var $elsewhere = array();
  59. var $cached_entities = array();
  60. var $http_base;
  61. var $base;
  62. var $base_location = 0;
  63. var $checked_feeds = 0;
  64. var $max_checked_feeds = 10;
  65. protected $registry;
  66. public function __construct(SimplePie_File $file, $timeout = 10, $useragent = null, $max_checked_feeds = 10)
  67. {
  68. $this->file = $file;
  69. $this->useragent = $useragent;
  70. $this->timeout = $timeout;
  71. $this->max_checked_feeds = $max_checked_feeds;
  72. if (class_exists('DOMDocument'))
  73. {
  74. $this->dom = new DOMDocument();
  75. set_error_handler(array('SimplePie_Misc', 'silence_errors'));
  76. $this->dom->loadHTML($this->file->body);
  77. restore_error_handler();
  78. }
  79. else
  80. {
  81. $this->dom = null;
  82. }
  83. }
  84. public function set_registry(SimplePie_Registry $registry)
  85. {
  86. $this->registry = $registry;
  87. }
  88. public function find($type = SIMPLEPIE_LOCATOR_ALL, &$working)
  89. {
  90. if ($this->is_feed($this->file))
  91. {
  92. return $this->file;
  93. }
  94. if ($this->file->method & SIMPLEPIE_FILE_SOURCE_REMOTE)
  95. {
  96. $sniffer = $this->registry->create('Content_Type_Sniffer', array($this->file));
  97. if ($sniffer->get_type() !== 'text/html')
  98. {
  99. return null;
  100. }
  101. }
  102. if ($type & ~SIMPLEPIE_LOCATOR_NONE)
  103. {
  104. $this->get_base();
  105. }
  106. if ($type & SIMPLEPIE_LOCATOR_AUTODISCOVERY && $working = $this->autodiscovery())
  107. {
  108. return $working[0];
  109. }
  110. if ($type & (SIMPLEPIE_LOCATOR_LOCAL_EXTENSION | SIMPLEPIE_LOCATOR_LOCAL_BODY | SIMPLEPIE_LOCATOR_REMOTE_EXTENSION | SIMPLEPIE_LOCATOR_REMOTE_BODY) && $this->get_links())
  111. {
  112. if ($type & SIMPLEPIE_LOCATOR_LOCAL_EXTENSION && $working = $this->extension($this->local))
  113. {
  114. return $working;
  115. }
  116. if ($type & SIMPLEPIE_LOCATOR_LOCAL_BODY && $working = $this->body($this->local))
  117. {
  118. return $working;
  119. }
  120. if ($type & SIMPLEPIE_LOCATOR_REMOTE_EXTENSION && $working = $this->extension($this->elsewhere))
  121. {
  122. return $working;
  123. }
  124. if ($type & SIMPLEPIE_LOCATOR_REMOTE_BODY && $working = $this->body($this->elsewhere))
  125. {
  126. return $working;
  127. }
  128. }
  129. return null;
  130. }
  131. public function is_feed($file)
  132. {
  133. if ($file->method & SIMPLEPIE_FILE_SOURCE_REMOTE)
  134. {
  135. $sniffer = $this->registry->create('Content_Type_Sniffer', array($file));
  136. $sniffed = $sniffer->get_type();
  137. if (in_array($sniffed, array('application/rss+xml', 'application/rdf+xml', 'text/rdf', 'application/atom+xml', 'text/xml', 'application/xml')))
  138. {
  139. return true;
  140. }
  141. else
  142. {
  143. return false;
  144. }
  145. }
  146. elseif ($file->method & SIMPLEPIE_FILE_SOURCE_LOCAL)
  147. {
  148. return true;
  149. }
  150. else
  151. {
  152. return false;
  153. }
  154. }
  155. public function get_base()
  156. {
  157. if ($this->dom === null)
  158. {
  159. throw new SimplePie_Exception('DOMDocument not found, unable to use locator');
  160. }
  161. $this->http_base = $this->file->url;
  162. $this->base = $this->http_base;
  163. $elements = $this->dom->getElementsByTagName('base');
  164. foreach ($elements as $element)
  165. {
  166. if ($element->hasAttribute('href'))
  167. {
  168. $base = $this->registry->call('Misc', 'absolutize_url', array(trim($element->getAttribute('href')), $this->http_base));
  169. if ($base === false)
  170. {
  171. continue;
  172. }
  173. $this->base = $base;
  174. $this->base_location = method_exists($element, 'getLineNo') ? $element->getLineNo() : 0;
  175. break;
  176. }
  177. }
  178. }
  179. public function autodiscovery()
  180. {
  181. $done = array();
  182. $feeds = array();
  183. $feeds = array_merge($feeds, $this->search_elements_by_tag('link', $done, $feeds));
  184. $feeds = array_merge($feeds, $this->search_elements_by_tag('a', $done, $feeds));
  185. $feeds = array_merge($feeds, $this->search_elements_by_tag('area', $done, $feeds));
  186. if (!empty($feeds))
  187. {
  188. return array_values($feeds);
  189. }
  190. else
  191. {
  192. return null;
  193. }
  194. }
  195. protected function search_elements_by_tag($name, &$done, $feeds)
  196. {
  197. if ($this->dom === null)
  198. {
  199. throw new SimplePie_Exception('DOMDocument not found, unable to use locator');
  200. }
  201. $links = $this->dom->getElementsByTagName($name);
  202. foreach ($links as $link)
  203. {
  204. if ($this->checked_feeds === $this->max_checked_feeds)
  205. {
  206. break;
  207. }
  208. if ($link->hasAttribute('href') && $link->hasAttribute('rel'))
  209. {
  210. $rel = array_unique($this->registry->call('Misc', 'space_seperated_tokens', array(strtolower($link->getAttribute('rel')))));
  211. $line = method_exists($link, 'getLineNo') ? $link->getLineNo() : 1;
  212. if ($this->base_location < $line)
  213. {
  214. $href = $this->registry->call('Misc', 'absolutize_url', array(trim($link->getAttribute('href')), $this->base));
  215. }
  216. else
  217. {
  218. $href = $this->registry->call('Misc', 'absolutize_url', array(trim($link->getAttribute('href')), $this->http_base));
  219. }
  220. if ($href === false)
  221. {
  222. continue;
  223. }
  224. if (!in_array($href, $done) && in_array('feed', $rel) || (in_array('alternate', $rel) && !in_array('stylesheet', $rel) && $link->hasAttribute('type') && in_array(strtolower($this->registry->call('Misc', 'parse_mime', array($link->getAttribute('type')))), array('application/rss+xml', 'application/atom+xml'))) && !isset($feeds[$href]))
  225. {
  226. $this->checked_feeds++;
  227. $headers = array(
  228. 'Accept' => 'application/atom+xml, application/rss+xml, application/rdf+xml;q=0.9, application/xml;q=0.8, text/xml;q=0.8, text/html;q=0.7, unknown/unknown;q=0.1, application/unknown;q=0.1, */*;q=0.1',
  229. );
  230. $feed = $this->registry->create('File', array($href, $this->timeout, 5, $headers, $this->useragent));
  231. if ($feed->success && ($feed->method & SIMPLEPIE_FILE_SOURCE_REMOTE === 0 || ($feed->status_code === 200 || $feed->status_code > 206 && $feed->status_code < 300)) && $this->is_feed($feed))
  232. {
  233. $feeds[$href] = $feed;
  234. }
  235. }
  236. $done[] = $href;
  237. }
  238. }
  239. return $feeds;
  240. }
  241. public function get_links()
  242. {
  243. if ($this->dom === null)
  244. {
  245. throw new SimplePie_Exception('DOMDocument not found, unable to use locator');
  246. }
  247. $links = $this->dom->getElementsByTagName('a');
  248. foreach ($links as $link)
  249. {
  250. if ($link->hasAttribute('href'))
  251. {
  252. $href = trim($link->getAttribute('href'));
  253. $parsed = $this->registry->call('Misc', 'parse_url', array($href));
  254. if ($parsed['scheme'] === '' || preg_match('/^(http(s)|feed)?$/i', $parsed['scheme']))
  255. {
  256. if (method_exists($link, 'getLineNo') && $this->base_location < $link->getLineNo())
  257. {
  258. $href = $this->registry->call('Misc', 'absolutize_url', array(trim($link->getAttribute('href')), $this->base));
  259. }
  260. else
  261. {
  262. $href = $this->registry->call('Misc', 'absolutize_url', array(trim($link->getAttribute('href')), $this->http_base));
  263. }
  264. if ($href === false)
  265. {
  266. continue;
  267. }
  268. $current = $this->registry->call('Misc', 'parse_url', array($this->file->url));
  269. if ($parsed['authority'] === '' || $parsed['authority'] === $current['authority'])
  270. {
  271. $this->local[] = $href;
  272. }
  273. else
  274. {
  275. $this->elsewhere[] = $href;
  276. }
  277. }
  278. }
  279. }
  280. $this->local = array_unique($this->local);
  281. $this->elsewhere = array_unique($this->elsewhere);
  282. if (!empty($this->local) || !empty($this->elsewhere))
  283. {
  284. return true;
  285. }
  286. return null;
  287. }
  288. public function extension(&$array)
  289. {
  290. foreach ($array as $key => $value)
  291. {
  292. if ($this->checked_feeds === $this->max_checked_feeds)
  293. {
  294. break;
  295. }
  296. if (in_array(strtolower(strrchr($value, '.')), array('.rss', '.rdf', '.atom', '.xml')))
  297. {
  298. $this->checked_feeds++;
  299. $headers = array(
  300. 'Accept' => 'application/atom+xml, application/rss+xml, application/rdf+xml;q=0.9, application/xml;q=0.8, text/xml;q=0.8, text/html;q=0.7, unknown/unknown;q=0.1, application/unknown;q=0.1, */*;q=0.1',
  301. );
  302. $feed = $this->registry->create('File', array($value, $this->timeout, 5, $headers, $this->useragent));
  303. if ($feed->success && ($feed->method & SIMPLEPIE_FILE_SOURCE_REMOTE === 0 || ($feed->status_code === 200 || $feed->status_code > 206 && $feed->status_code < 300)) && $this->is_feed($feed))
  304. {
  305. return $feed;
  306. }
  307. else
  308. {
  309. unset($array[$key]);
  310. }
  311. }
  312. }
  313. return null;
  314. }
  315. public function body(&$array)
  316. {
  317. foreach ($array as $key => $value)
  318. {
  319. if ($this->checked_feeds === $this->max_checked_feeds)
  320. {
  321. break;
  322. }
  323. if (preg_match('/(rss|rdf|atom|xml)/i', $value))
  324. {
  325. $this->checked_feeds++;
  326. $headers = array(
  327. 'Accept' => 'application/atom+xml, application/rss+xml, application/rdf+xml;q=0.9, application/xml;q=0.8, text/xml;q=0.8, text/html;q=0.7, unknown/unknown;q=0.1, application/unknown;q=0.1, */*;q=0.1',
  328. );
  329. $feed = $this->registry->create('File', array($value, $this->timeout, 5, null, $this->useragent));
  330. if ($feed->success && ($feed->method & SIMPLEPIE_FILE_SOURCE_REMOTE === 0 || ($feed->status_code === 200 || $feed->status_code > 206 && $feed->status_code < 300)) && $this->is_feed($feed))
  331. {
  332. return $feed;
  333. }
  334. else
  335. {
  336. unset($array[$key]);
  337. }
  338. }
  339. }
  340. return null;
  341. }
  342. }