WordPress/wp-includes/feed-rss2.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

125 lines
3.7 KiB
PHP

<?php
/**
* RSS2 Feed Template for displaying RSS2 Posts feed.
*
* @package WordPress
*/
header('Content-Type: ' . feed_content_type('rss2') . '; charset=' . get_option('blog_charset'), true);
$more = 1;
echo '<?xml version="1.0" encoding="'.get_option('blog_charset').'"?'.'>';
/**
* Fires between the xml and rss tags in a feed.
*
* @since 4.0.0
*
* @param string $context Type of feed. Possible values include 'rss2', 'rss2-comments',
* 'rdf', 'atom', and 'atom-comments'.
*/
do_action( 'rss_tag_pre', 'rss2' );
?>
<rss version="2.0"
xmlns:content="http://purl.org/rss/1.0/modules/content/"
xmlns:wfw="http://wellformedweb.org/CommentAPI/"
xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:atom="http://www.w3.org/2005/Atom"
xmlns:sy="http://purl.org/rss/1.0/modules/syndication/"
xmlns:slash="http://purl.org/rss/1.0/modules/slash/"
<?php
/**
* Fires at the end of the RSS root to add namespaces.
*
* @since 2.0.0
*/
do_action( 'rss2_ns' );
?>
>
<channel>
<title><?php wp_title_rss(); ?></title>
<atom:link href="<?php self_link(); ?>" rel="self" type="application/rss+xml" />
<link><?php bloginfo_rss('url') ?></link>
<description><?php bloginfo_rss("description") ?></description>
<lastBuildDate><?php
$date = get_lastpostmodified( 'GMT' );
echo $date ? mysql2date( 'D, d M Y H:i:s +0000', $date ) : date( 'D, d M Y H:i:s +0000' );
?></lastBuildDate>
<language><?php bloginfo_rss( 'language' ); ?></language>
<sy:updatePeriod><?php
$duration = 'hourly';
/**
* Filters how often to update the RSS feed.
*
* @since 2.1.0
*
* @param string $duration The update period. Accepts 'hourly', 'daily', 'weekly', 'monthly',
* 'yearly'. Default 'hourly'.
*/
echo apply_filters( 'rss_update_period', $duration );
?></sy:updatePeriod>
<sy:updateFrequency><?php
$frequency = '1';
/**
* Filters the RSS update frequency.
*
* @since 2.1.0
*
* @param string $frequency An integer passed as a string representing the frequency
* of RSS updates within the update period. Default '1'.
*/
echo apply_filters( 'rss_update_frequency', $frequency );
?></sy:updateFrequency>
<?php
/**
* Fires at the end of the RSS2 Feed Header.
*
* @since 2.0.0
*/
do_action( 'rss2_head');
while( have_posts()) : the_post();
?>
<item>
<title><?php the_title_rss() ?></title>
<link><?php the_permalink_rss() ?></link>
<?php if ( get_comments_number() || comments_open() ) : ?>
<comments><?php comments_link_feed(); ?></comments>
<?php endif; ?>
<pubDate><?php echo mysql2date('D, d M Y H:i:s +0000', get_post_time('Y-m-d H:i:s', true), false); ?></pubDate>
<dc:creator><![CDATA[<?php the_author() ?>]]></dc:creator>
<?php the_category_rss('rss2') ?>
<guid isPermaLink="false"><?php the_guid(); ?></guid>
<?php if (get_option('rss_use_excerpt')) : ?>
<description><![CDATA[<?php the_excerpt_rss(); ?>]]></description>
<?php else : ?>
<description><![CDATA[<?php the_excerpt_rss(); ?>]]></description>
<?php $content = get_the_content_feed('rss2'); ?>
<?php if ( strlen( $content ) > 0 ) : ?>
<content:encoded><![CDATA[<?php echo $content; ?>]]></content:encoded>
<?php else : ?>
<content:encoded><![CDATA[<?php the_excerpt_rss(); ?>]]></content:encoded>
<?php endif; ?>
<?php endif; ?>
<?php if ( get_comments_number() || comments_open() ) : ?>
<wfw:commentRss><?php echo esc_url( get_post_comments_feed_link(null, 'rss2') ); ?></wfw:commentRss>
<slash:comments><?php echo get_comments_number(); ?></slash:comments>
<?php endif; ?>
<?php rss_enclosure(); ?>
<?php
/**
* Fires at the end of each RSS2 feed item.
*
* @since 2.0.0
*/
do_action( 'rss2_item' );
?>
</item>
<?php endwhile; ?>
</channel>
</rss>