<?php
/**
 * XML feed export
 *
 * @license    GPL 2 (http://www.gnu.org/licenses/gpl.html)
 * @author     Andreas Gohr <andi@splitbrain.org>
 * @author     Esther Brunner <wikidesign@gmail.com>
 */

if (!defined('DOKU_INC')) define('DOKU_INC', __DIR__ . '/../../../');
require_once(DOKU_INC . 'inc/init.php');
session_write_close();

$plugin = $INPUT->str('plugin');
$fn = $INPUT->str('fn');
$ns = cleanID($INPUT->str('ns'));
$num = $INPUT->int('num');
$other = $INPUT->str('tag') . $INPUT->str('user');
$title = $INPUT->str('title');
$type = $INPUT->str('type', $conf['rss_type']);

switch ($type) {
    case 'rss':
        $type = 'RSS0.91';
        $mime = 'text/xml';
        break;
    case 'rss2':
        $type = 'RSS2.0';
        $mime = 'text/xml';
        break;
    case 'atom':
        $type = 'ATOM0.3';
        $mime = 'application/xml';
        break;
    case 'atom1':
        $type = 'ATOM1.0';
        $mime = 'application/atom+xml';
        break;
    default:
        $type = 'RSS1.0';
        $mime = 'application/xml';
}

// the feed is dynamic - we need a cache for each combo
// (but most people just use the default feed so it's still effective)
$cache = getCacheName($plugin . $fn . $ns . $num . $other . $type . $INPUT->server->str('REMOTE_USER'), '.feed');
$cmod = @filemtime($cache); // 0 if not exists
if ($cmod && (@filemtime(DOKU_CONF . 'local.php') > $cmod
        || @filemtime(DOKU_CONF . 'dokuwiki.php') > $cmod)
) {
    // ignore cache if feed prefs may have changed
    $cmod = 0;
}

// check cacheage and deliver if nothing has changed since last
// time or the update interval has not passed, also handles conditional requests
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Pragma: public');
header('Content-Type: application/xml; charset=utf-8');

if ($cmod && (
        ($cmod + $conf['rss_update'] > time())
        || (
            ($cmod > @filemtime($conf['changelog']))
            &&
            //discussion has its own changelog
            ($plugin !== 'discussion' || $cmod > @filemtime($conf['metadir'] . '/_comments.changes'))
        )
    )) {
    http_conditionalRequest($cmod);
    if ($conf['allowdebug']) header("X-CacheUsed: $cache");
    print io_readFile($cache);
    exit;
} else {
    http_conditionalRequest(time());
}

// create new feed
$rss = new UniversalFeedCreator();
$rss->title = $title;
if ($ns) {
    $rss->title .= ' ' . ucwords(str_replace(array('_', ':'), array(' ', ': '), $ns));
} elseif ($other) {
    $rss->title .= ' ' . ucwords(str_replace('_', ' ', $other));
}
$rss->title .= ' · ' . $conf['title'];
$rss->link = DOKU_URL;
$rss->syndicationURL = DOKU_PLUGIN . 'feed/feed.php';
$rss->cssStyleSheet = DOKU_URL . 'lib/exe/css.php?s=feed';

$image = new FeedImage();
$image->title = $conf['title'];
$image->url = DOKU_URL . "lib/images/favicon.ico";
$image->link = DOKU_URL;
$rss->image = $image;

if ($po = plugin_load('helper', $plugin)) {
    feed_getPages($rss, $po, $ns, $num, $fn);
}
$feed = $rss->createFeed($type);

// save cachefile
io_saveFile($cache, $feed);

// finally deliver
print $feed;

/* ---------- */

/**
 * Add pages given by plugin to feed object
 *
 * @param UniversalFeedCreator $rss
 * @param \dokuwiki\Extension\PluginInterface $po
 * @param string $ns
 * @param int $num
 * @param string $fn
 * @return bool
 * @author Andreas Gohr <andi@splitbrain.org>
 * @author Esther Brunner <wikidesign@gmail.com>
 *
 */
function feed_getPages($rss, $po, $ns, $num, $fn)
{
    global $conf;

    if ((!$num) || (!is_numeric($num))) $num = $conf['recent'];

    // get the pages for our namespace
    $pages = $po->$fn($ns, $num);
    if (!$pages) return false;

    foreach ($pages as $page) {
        $item = new FeedItem();

        list($id, /* $hash */) = explode('#', $page['id'], 2);
        $meta = p_get_metadata($id);

        // title
        if ($page['title']) {
            $item->title = $page['title'];
        } elseif ($meta['title']) {
            $item->title = $meta['title'];
        } else {
            $item->title = ucwords($id);
        }

        // link
        $item->link = wl($page['id'], '', true, '&') . '#' . $page['anchor'];

        // description
        if ($page['desc']) {
            $description = $page['desc'];
        } else {
            $description = $meta['description']['abstract'];
        }
        if (get_class($po) == 'helper_plugin_discussion') {
            //discussion plugins returns striped parsed text, inclusive encoded chars. Don't double encode.
            $description = htmlspecialchars($description, ENT_COMPAT, 'UTF-8', $double_encode = false);
        } else {
            $description = htmlspecialchars($description);
        }
        $item->description = $description;

        // date
        $item->date = date('r', $page['date']);

        // category
        if ($page['cat']) {
            $item->category = $page['cat'];
        } elseif ($meta['subject']) {
            if (is_array($meta['subject'])) {
                $item->category = $meta['subject'][0];
            } else {
                $item->category = $meta['subject'];
            }
        }

        // creator
        if ($page['user']) {
            $item->author = $page['user'];
        } else {
            $item->author = $meta['creator'];
        }

        $rss->addItem($item);
    }
    return true;
}