default.php

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<?php
use Elgg\Exceptions\Http\PageNotFoundException;

// Don't show RSS if disabled
if (elgg()->config->disable_rss) {
    throw new PageNotFoundException();
}

// Set title
if (empty($vars['title'])) {
    $title = elgg_get_site_entity()->getDisplayName();
} else {
    $title = elgg_get_site_entity()->getDisplayName() . ": " . $vars['title'];
}

// Remove RSS from URL
$url = elgg_http_remove_url_query_element(elgg_get_current_url(), 'view');

$rssurl = htmlspecialchars($url, ENT_NOQUOTES, 'UTF-8');
$url = htmlspecialchars($url, ENT_NOQUOTES, 'UTF-8');

$body = elgg_extract('body', $vars, '');
$description = elgg_extract('description', $vars, '');

$namespaces = elgg_view('extensions/xmlns');
$extensions = elgg_view('extensions/channel');


// allow caching as required by stupid MS products for https feeds.
elgg_set_http_header('Pragma: public');
elgg_set_http_header("Content-Type: text/xml;charset=utf-8");

echo "<?xml version='1.0'?>";
echo <<<END
<rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:georss="http://www.georss.org/georss" xmlns:atom="http://www.w3.org/2005/Atom" $namespaces>
<channel>
    <title><![CDATA[$title]]></title>
    <link>$url</link>
    <atom:link href="$rssurl" rel="self" type="application/rss+xml" />
    <description><![CDATA[$description]]></description>
    $extensions
    $body
</channel>
</rss>
END;