550 lines
15 KiB
PHP
550 lines
15 KiB
PHP
<?php
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/**
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* WordPress Feed API
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*
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* Many of the functions used in here belong in The Loop, or The Loop for the
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* Feeds.
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*
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* @package WordPress
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* @subpackage Feed
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*/
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/**
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* RSS container for the bloginfo function.
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*
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* You can retrieve anything that you can using the get_bloginfo() function.
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* Everything will be stripped of tags and characters converted, when the values
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* are retrieved for use in the feeds.
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*
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* @package WordPress
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* @subpackage Feed
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* @since 1.5.1
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* @uses apply_filters() Calls 'get_bloginfo_rss' hook with two parameters.
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* @see get_bloginfo() For the list of possible values to display.
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*
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* @param string $show See get_bloginfo() for possible values.
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* @return string
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*/
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function get_bloginfo_rss($show = '') {
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$info = strip_tags(get_bloginfo($show));
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return apply_filters('get_bloginfo_rss', convert_chars($info), $show);
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}
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/**
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* Display RSS container for the bloginfo function.
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*
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* You can retrieve anything that you can using the get_bloginfo() function.
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* Everything will be stripped of tags and characters converted, when the values
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* are retrieved for use in the feeds.
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*
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* @package WordPress
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* @subpackage Feed
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* @since 0.71
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* @uses apply_filters() Calls 'bloginfo_rss' hook with two parameters.
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* @see get_bloginfo() For the list of possible values to display.
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*
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* @param string $show See get_bloginfo() for possible values.
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*/
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function bloginfo_rss($show = '') {
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echo apply_filters('bloginfo_rss', get_bloginfo_rss($show), $show);
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}
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/**
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* Retrieve the default feed.
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*
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* The default feed is 'rss2', unless a plugin changes it through the
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* 'default_feed' filter.
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*
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* @package WordPress
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* @subpackage Feed
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* @since 2.5
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* @uses apply_filters() Calls 'default_feed' hook on the default feed string.
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*
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* @return string Default feed, or for example 'rss2', 'atom', etc.
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*/
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function get_default_feed() {
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$default_feed = apply_filters('default_feed', 'rss2');
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return 'rss' == $default_feed ? 'rss2' : $default_feed;
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}
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/**
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* Retrieve the blog title for the feed title.
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*
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* @package WordPress
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* @subpackage Feed
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* @since 2.2.0
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* @uses apply_filters() Calls 'get_wp_title_rss' hook on title.
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* @uses wp_title() See function for $sep parameter usage.
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*
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* @param string $sep Optional.How to separate the title. See wp_title() for more info.
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* @return string Error message on failure or blog title on success.
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*/
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function get_wp_title_rss($sep = '»') {
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$title = wp_title($sep, false);
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if ( is_wp_error( $title ) )
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return $title->get_error_message();
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$title = apply_filters('get_wp_title_rss', $title);
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return $title;
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}
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/**
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* Display the blog title for display of the feed title.
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*
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* @package WordPress
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* @subpackage Feed
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* @since 2.2.0
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* @uses apply_filters() Calls 'wp_title_rss' on the blog title.
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* @see wp_title() $sep parameter usage.
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*
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* @param string $sep Optional.
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*/
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function wp_title_rss($sep = '»') {
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echo apply_filters('wp_title_rss', get_wp_title_rss($sep));
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}
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/**
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* Retrieve the current post title for the feed.
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*
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* @package WordPress
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* @subpackage Feed
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* @since 2.0.0
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* @uses apply_filters() Calls 'the_title_rss' on the post title.
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*
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* @return string Current post title.
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*/
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function get_the_title_rss() {
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$title = get_the_title();
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$title = apply_filters('the_title_rss', $title);
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return $title;
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}
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/**
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* Display the post title in the feed.
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*
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* @package WordPress
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* @subpackage Feed
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* @since 0.71
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* @uses get_the_title_rss() Used to retrieve current post title.
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*/
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function the_title_rss() {
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echo get_the_title_rss();
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}
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/**
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* Retrieve the post content for feeds.
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*
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* @package WordPress
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* @subpackage Feed
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* @since 2.9.0
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* @uses apply_filters() Calls 'the_content_feed' on the content before processing.
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* @see get_the_content()
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*
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* @param string $feed_type The type of feed. rss2 | atom | rss | rdf
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* @return string The filtered content.
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*/
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function get_the_content_feed($feed_type = null) {
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if ( !$feed_type )
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$feed_type = get_default_feed();
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$content = apply_filters('the_content', get_the_content());
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$content = str_replace(']]>', ']]>', $content);
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return apply_filters('the_content_feed', $content, $feed_type);
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}
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/**
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* Display the post content for feeds.
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*
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* @package WordPress
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* @subpackage Feed
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* @since 2.9.0
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* @uses apply_filters() Calls 'the_content_feed' on the content before processing.
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* @see get_the_content()
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*
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* @param string $feed_type The type of feed. rss2 | atom | rss | rdf
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*/
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function the_content_feed($feed_type = null) {
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echo get_the_content_feed($feed_type);
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}
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/**
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* Display the post excerpt for the feed.
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*
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* @package WordPress
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* @subpackage Feed
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* @since 0.71
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* @uses apply_filters() Calls 'the_excerpt_rss' hook on the excerpt.
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*/
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function the_excerpt_rss() {
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$output = get_the_excerpt();
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echo apply_filters('the_excerpt_rss', $output);
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}
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/**
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* Display the permalink to the post for use in feeds.
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*
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* @package WordPress
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* @subpackage Feed
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* @since 2.3.0
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* @uses apply_filters() Call 'the_permalink_rss' on the post permalink
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*/
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function the_permalink_rss() {
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echo esc_url( apply_filters('the_permalink_rss', get_permalink() ));
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}
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/**
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* Outputs the link to the comments for the current post in an xml safe way
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*
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* @since 3.0.0
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* @return none
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*/
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function comments_link_feed() {
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echo esc_url( get_comments_link() );
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}
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/**
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* Display the feed GUID for the current comment.
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*
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* @package WordPress
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* @subpackage Feed
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* @since 2.5.0
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*
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* @param int|object $comment_id Optional comment object or id. Defaults to global comment object.
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*/
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function comment_guid($comment_id = null) {
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echo esc_url( get_comment_guid($comment_id) );
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}
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/**
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* Retrieve the feed GUID for the current comment.
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*
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* @package WordPress
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* @subpackage Feed
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* @since 2.5.0
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*
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* @param int|object $comment_id Optional comment object or id. Defaults to global comment object.
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* @return bool|string false on failure or guid for comment on success.
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*/
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function get_comment_guid($comment_id = null) {
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$comment = get_comment($comment_id);
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if ( !is_object($comment) )
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return false;
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return get_the_guid($comment->comment_post_ID) . '#comment-' . $comment->comment_ID;
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}
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/**
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* Display the link to the comments.
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*
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* @since 1.5.0
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*/
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function comment_link() {
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echo esc_url( get_comment_link() );
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}
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/**
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* Retrieve the current comment author for use in the feeds.
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*
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* @package WordPress
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* @subpackage Feed
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* @since 2.0.0
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* @uses apply_filters() Calls 'comment_author_rss' hook on comment author.
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* @uses get_comment_author()
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*
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* @return string Comment Author
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*/
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function get_comment_author_rss() {
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return apply_filters('comment_author_rss', get_comment_author() );
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}
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/**
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* Display the current comment author in the feed.
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*
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* @package WordPress
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* @subpackage Feed
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* @since 1.0.0
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*/
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function comment_author_rss() {
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echo get_comment_author_rss();
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}
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/**
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* Display the current comment content for use in the feeds.
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*
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* @package WordPress
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* @subpackage Feed
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* @since 1.0.0
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* @uses apply_filters() Calls 'comment_text_rss' filter on comment content.
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* @uses get_comment_text()
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*/
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function comment_text_rss() {
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$comment_text = get_comment_text();
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$comment_text = apply_filters('comment_text_rss', $comment_text);
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echo $comment_text;
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}
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/**
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* Retrieve all of the post categories, formatted for use in feeds.
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*
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* All of the categories for the current post in the feed loop, will be
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* retrieved and have feed markup added, so that they can easily be added to the
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* RSS2, Atom, or RSS1 and RSS0.91 RDF feeds.
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*
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* @package WordPress
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* @subpackage Feed
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* @since 2.1.0
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* @uses apply_filters()
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*
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* @param string $type Optional, default is the type returned by get_default_feed().
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* @return string All of the post categories for displaying in the feed.
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*/
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function get_the_category_rss($type = null) {
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if ( empty($type) )
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$type = get_default_feed();
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$categories = get_the_category();
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$tags = get_the_tags();
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$the_list = '';
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$cat_names = array();
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$filter = 'rss';
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if ( 'atom' == $type )
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$filter = 'raw';
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if ( !empty($categories) ) foreach ( (array) $categories as $category ) {
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$cat_names[] = sanitize_term_field('name', $category->name, $category->term_id, 'category', $filter);
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}
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if ( !empty($tags) ) foreach ( (array) $tags as $tag ) {
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$cat_names[] = sanitize_term_field('name', $tag->name, $tag->term_id, 'post_tag', $filter);
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}
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$cat_names = array_unique($cat_names);
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foreach ( $cat_names as $cat_name ) {
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if ( 'rdf' == $type )
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$the_list .= "\t\t<dc:subject><![CDATA[$cat_name]]></dc:subject>\n";
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elseif ( 'atom' == $type )
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$the_list .= sprintf( '<category scheme="%1$s" term="%2$s" />', esc_attr( apply_filters( 'get_bloginfo_rss', get_bloginfo( 'url' ) ) ), esc_attr( $cat_name ) );
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else
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$the_list .= "\t\t<category><![CDATA[" . @html_entity_decode( $cat_name, ENT_COMPAT, get_option('blog_charset') ) . "]]></category>\n";
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}
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return apply_filters('the_category_rss', $the_list, $type);
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}
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/**
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* Display the post categories in the feed.
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*
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* @package WordPress
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* @subpackage Feed
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* @since 0.71
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* @see get_the_category_rss() For better explanation.
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*
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* @param string $type Optional, default is the type returned by get_default_feed().
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*/
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function the_category_rss($type = null) {
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echo get_the_category_rss($type);
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}
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/**
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* Display the HTML type based on the blog setting.
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*
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* The two possible values are either 'xhtml' or 'html'.
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*
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* @package WordPress
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* @subpackage Feed
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* @since 2.2.0
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*/
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function html_type_rss() {
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$type = get_bloginfo('html_type');
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if (strpos($type, 'xhtml') !== false)
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$type = 'xhtml';
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else
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$type = 'html';
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echo $type;
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}
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/**
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* Display the rss enclosure for the current post.
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*
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* Uses the global $post to check whether the post requires a password and if
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* the user has the password for the post. If not then it will return before
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* displaying.
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*
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* Also uses the function get_post_custom() to get the post's 'enclosure'
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* metadata field and parses the value to display the enclosure(s). The
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* enclosure(s) consist of enclosure HTML tag(s) with a URI and other
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* attributes.
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*
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* @package WordPress
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* @subpackage Template
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* @since 1.5.0
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* @uses apply_filters() Calls 'rss_enclosure' hook on rss enclosure.
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* @uses get_post_custom() To get the current post enclosure metadata.
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*/
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function rss_enclosure() {
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if ( post_password_required() )
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return;
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foreach ( (array) get_post_custom() as $key => $val) {
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if ($key == 'enclosure') {
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foreach ( (array) $val as $enc ) {
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$enclosure = explode("\n", $enc);
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//only get the the first element eg, audio/mpeg from 'audio/mpeg mpga mp2 mp3'
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$t = preg_split('/[ \t]/', trim($enclosure[2]) );
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$type = $t[0];
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echo apply_filters('rss_enclosure', '<enclosure url="' . trim(htmlspecialchars($enclosure[0])) . '" length="' . trim($enclosure[1]) . '" type="' . $type . '" />' . "\n");
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}
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}
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}
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}
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/**
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* Display the atom enclosure for the current post.
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*
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* Uses the global $post to check whether the post requires a password and if
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* the user has the password for the post. If not then it will return before
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* displaying.
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*
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* Also uses the function get_post_custom() to get the post's 'enclosure'
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* metadata field and parses the value to display the enclosure(s). The
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* enclosure(s) consist of link HTML tag(s) with a URI and other attributes.
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*
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* @package WordPress
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* @subpackage Template
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* @since 2.2.0
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* @uses apply_filters() Calls 'atom_enclosure' hook on atom enclosure.
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* @uses get_post_custom() To get the current post enclosure metadata.
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*/
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function atom_enclosure() {
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if ( post_password_required() )
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return;
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foreach ( (array) get_post_custom() as $key => $val ) {
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if ($key == 'enclosure') {
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foreach ( (array) $val as $enc ) {
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$enclosure = explode("\n", $enc);
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echo apply_filters('atom_enclosure', '<link href="' . trim(htmlspecialchars($enclosure[0])) . '" rel="enclosure" length="' . trim($enclosure[1]) . '" type="' . trim($enclosure[2]) . '" />' . "\n");
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}
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}
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}
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}
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/**
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* Determine the type of a string of data with the data formatted.
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*
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* Tell whether the type is text, html, or xhtml, per RFC 4287 section 3.1.
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*
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* In the case of WordPress, text is defined as containing no markup,
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* xhtml is defined as "well formed", and html as tag soup (i.e., the rest).
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*
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* Container div tags are added to xhtml values, per section 3.1.1.3.
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*
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* @link http://www.atomenabled.org/developers/syndication/atom-format-spec.php#rfc.section.3.1
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*
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* @package WordPress
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* @subpackage Feed
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* @since 2.5
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*
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* @param string $data Input string
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* @return array array(type, value)
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*/
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function prep_atom_text_construct($data) {
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if (strpos($data, '<') === false && strpos($data, '&') === false) {
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return array('text', $data);
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}
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$parser = xml_parser_create();
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xml_parse($parser, '<div>' . $data . '</div>', true);
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$code = xml_get_error_code($parser);
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xml_parser_free($parser);
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if (!$code) {
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if (strpos($data, '<') === false) {
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return array('text', $data);
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} else {
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$data = "<div xmlns='http://www.w3.org/1999/xhtml'>$data</div>";
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return array('xhtml', $data);
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}
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}
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if (strpos($data, ']]>') == false) {
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return array('html', "<![CDATA[$data]]>");
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} else {
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return array('html', htmlspecialchars($data));
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}
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}
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/**
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* Display the link for the currently displayed feed in a XSS safe way.
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*
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* Generate a correct link for the atom:self element.
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*
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* @package WordPress
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* @subpackage Feed
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* @since 2.5
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*/
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function self_link() {
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$host = @parse_url(home_url());
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echo esc_url( set_url_scheme( 'http://' . $host['host'] . stripslashes($_SERVER['REQUEST_URI']) ) );
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}
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/**
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* Return the content type for specified feed type.
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*
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* @package WordPress
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* @subpackage Feed
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* @since 2.8.0
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*/
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function feed_content_type( $type = '' ) {
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if ( empty($type) )
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$type = get_default_feed();
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$types = array(
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'rss' => 'application/rss+xml',
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'rss2' => 'application/rss+xml',
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'rss-http' => 'text/xml',
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'atom' => 'application/atom+xml',
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'rdf' => 'application/rdf+xml'
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);
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$content_type = ( !empty($types[$type]) ) ? $types[$type] : 'application/octet-stream';
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return apply_filters( 'feed_content_type', $content_type, $type );
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}
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/**
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* Build SimplePie object based on RSS or Atom feed from URL.
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*
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* @since 2.8
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*
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* @param string $url URL to retrieve feed
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* @return WP_Error|SimplePie WP_Error object on failure or SimplePie object on success
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*/
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function fetch_feed($url) {
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require_once (ABSPATH . WPINC . '/class-feed.php');
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$feed = new SimplePie();
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$feed->set_sanitize_class( 'WP_SimplePie_Sanitize_KSES' );
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// We must manually overwrite $feed->sanitize because SimplePie's
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// constructor sets it before we have a chance to set the sanitization class
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$feed->sanitize = new WP_SimplePie_Sanitize_KSES();
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$feed->set_cache_class( 'WP_Feed_Cache' );
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$feed->set_file_class( 'WP_SimplePie_File' );
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$feed->set_feed_url($url);
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$feed->set_cache_duration( apply_filters( 'wp_feed_cache_transient_lifetime', 12 * HOUR_IN_SECONDS, $url ) );
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do_action_ref_array( 'wp_feed_options', array( &$feed, $url ) );
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$feed->init();
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$feed->handle_content_type();
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if ( $feed->error() )
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return new WP_Error('simplepie-error', $feed->error());
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return $feed;
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}
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