feed.php

   1 <?php
   2
   3 /**
   4  * XML feed export
   5  *
   6  * @license    GPL 2 (http://www.gnu.org/licenses/gpl.html)
   7  * @author     Andreas Gohr <andi@splitbrain.org>
   8  *
   9  * @global array $conf
  10  * @global Input $INPUT
  11  */
  12
  13 use dokuwiki\Feed\FeedCreator;
  14 use dokuwiki\Feed\FeedCreatorOptions;
  15 use dokuwiki\Cache\Cache;
  16 use dokuwiki\ChangeLog\MediaChangeLog;
  17 use dokuwiki\ChangeLog\PageChangeLog;
  18 use dokuwiki\Extension\AuthPlugin;
  19 use dokuwiki\Extension\Event;
  20
  21 if (!defined('DOKU_INC')) define('DOKU_INC', __DIR__ . '/');
  22 require_once(DOKU_INC . 'inc/init.php');
  23
  24 //close session
  25 session_write_close();
  26
  27 //feed disabled?
  28 if (!actionOK('rss')) {
  29     http_status(404);
  30     echo '<error>RSS feed is disabled.</error>';
  31     exit;
  32 }
  33
  34 $options = new FeedCreatorOptions();
  35
  36 // the feed is dynamic - we need a cache for each combo
  37 // (but most people just use the default feed so it's still effective)
  38 $key = implode('$', [
  39     $options->getCacheKey(),
  40     $INPUT->server->str('REMOTE_USER'),
  41     $INPUT->server->str('HTTP_HOST'),
  42     $INPUT->server->str('SERVER_PORT')
  43 ]);
  44 $cache = new Cache($key, '.feed');
  45
  46 // prepare cache depends
  47 $depends['files'] = getConfigFiles('main');
  48 $depends['age'] = $conf['rss_update'];
  49 $depends['purge'] = $INPUT->bool('purge');
  50
  51 // check cacheage and deliver if nothing has changed since last
  52 // time or the update interval has not passed, also handles conditional requests
  53 header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
  54 header('Pragma: public');
  55 header('Content-Type: ' . $options->getMimeType());
  56 header('X-Robots-Tag: noindex');
  57 if ($cache->useCache($depends)) {
  58     http_conditionalRequest($cache->getTime());
  59     if ($conf['allowdebug']) header("X-CacheUsed: $cache->cache");
  60     echo $cache->retrieveCache();
  61     exit;
  62 } else {
  63     http_conditionalRequest(time());
  64 }
  65
  66 // create new feed
  67 try {
  68     $feed = (new FeedCreator($options))->build();
  69     $cache->storeCache($feed);
  70     echo $feed;
  71 } catch (Exception $e) {
  72     http_status(500);
  73     echo '<error>' . hsc($e->getMessage()) . '</error>';
  74     exit;
  75 }