WordPress/wp-includes/feed-rdf.php
Rachel Baker 2f263fce99 Feeds: Always return a valid timestamp for the Last-Modified header of comment or post feeds.
Fixes bug where an invalid Last-Modified value would be returned in feed requests for sites that had 0 items to return. Comment or post feeds will now return the current timestamp as the Last-Modified header value.  Example: a request for the comments feed for a site without any comments.

Replaced use of the local static variable `$cache_lastcommentmodified` to store the modified date in `get_lastcommentmodified()` with the Object Cache API.  The `get_lastcommentmodified()` function returns early if there is a cached value and returns `false` if there where no comments found. Introduced `_clear_modified_cache_on_transition_comment_status()` to flush the `lastcommentmodified` cache key when a comment enters or leaves approval status. In `get_lastpostmodified()` return early if there is a cached value and return `false` if there are no posts found.

Props swissspidy, rachelbaker, dllh, leobaiano.
Fixes #38027.
Built from https://develop.svn.wordpress.org/trunk@38925


git-svn-id: http://core.svn.wordpress.org/trunk@38868 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-10-25 20:48:29 +00:00

89 lines
2.6 KiB
PHP

<?php
/**
* RSS 1 RDF Feed Template for displaying RSS 1 Posts feed.
*
* @package WordPress
*/
header('Content-Type: ' . feed_content_type('rdf') . '; charset=' . get_option('blog_charset'), true);
$more = 1;
echo '<?xml version="1.0" encoding="'.get_option('blog_charset').'"?'.'>';
/** This action is documented in wp-includes/feed-rss2.php */
do_action( 'rss_tag_pre', 'rdf' );
?>
<rdf:RDF
xmlns="http://purl.org/rss/1.0/"
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:sy="http://purl.org/rss/1.0/modules/syndication/"
xmlns:admin="http://webns.net/mvcb/"
xmlns:content="http://purl.org/rss/1.0/modules/content/"
<?php
/**
* Fires at the end of the feed root to add namespaces.
*
* @since 2.0.0
*/
do_action( 'rdf_ns' );
?>
>
<channel rdf:about="<?php bloginfo_rss("url") ?>">
<title><?php wp_title_rss(); ?></title>
<link><?php bloginfo_rss('url') ?></link>
<description><?php bloginfo_rss('description') ?></description>
<dc:date><?php
$date = get_lastpostmodified( 'GMT' );
echo $date ? mysql2date( 'Y-m-d\TH:i:s\Z', $date ) : date( 'Y-m-d\TH:i:s\Z' );
?></dc:date>
<sy:updatePeriod><?php
/** This filter is documented in wp-includes/feed-rss2.php */
echo apply_filters( 'rss_update_period', 'hourly' );
?></sy:updatePeriod>
<sy:updateFrequency><?php
/** This filter is documented in wp-includes/feed-rss2.php */
echo apply_filters( 'rss_update_frequency', '1' );
?></sy:updateFrequency>
<sy:updateBase>2000-01-01T12:00+00:00</sy:updateBase>
<?php
/**
* Fires at the end of the RDF feed header.
*
* @since 2.0.0
*/
do_action( 'rdf_header' );
?>
<items>
<rdf:Seq>
<?php while (have_posts()): the_post(); ?>
<rdf:li rdf:resource="<?php the_permalink_rss() ?>"/>
<?php endwhile; ?>
</rdf:Seq>
</items>
</channel>
<?php rewind_posts(); while (have_posts()): the_post(); ?>
<item rdf:about="<?php the_permalink_rss() ?>">
<title><?php the_title_rss() ?></title>
<link><?php the_permalink_rss() ?></link>
<dc:date><?php echo mysql2date('Y-m-d\TH:i:s\Z', $post->post_date_gmt, false); ?></dc:date>
<dc:creator><![CDATA[<?php the_author() ?>]]></dc:creator>
<?php the_category_rss('rdf') ?>
<?php if (get_option('rss_use_excerpt')) : ?>
<description><![CDATA[<?php the_excerpt_rss() ?>]]></description>
<?php else : ?>
<description><![CDATA[<?php the_excerpt_rss() ?>]]></description>
<content:encoded><![CDATA[<?php the_content_feed('rdf') ?>]]></content:encoded>
<?php endif; ?>
<?php
/**
* Fires at the end of each RDF feed item.
*
* @since 2.0.0
*/
do_action( 'rdf_item' );
?>
</item>
<?php endwhile; ?>
</rdf:RDF>