698 lines
18 KiB
PHP
698 lines
18 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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* @since 1.5.1
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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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/**
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* Filter the bloginfo for use in RSS feeds.
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*
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* @since 2.2.0
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*
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* @see convert_chars()
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* @see get_bloginfo()
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*
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* @param string $info Converted string value of the blog information.
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* @param string $show The type of blog information to retrieve.
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*/
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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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* @since 0.71
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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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/**
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* Filter the bloginfo for display in RSS feeds.
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*
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* @since 2.1.0
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*
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* @see get_bloginfo()
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*
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* @param string $rss_container RSS container for the blog information.
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* @param string $show The type of blog information to retrieve.
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*/
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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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* @since 2.5.0
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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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/**
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* Filter the default feed type.
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*
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* @since 2.5.0
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*
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* @param string $feed_type Type of default feed. Possible values include 'rss2', 'atom'.
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* Default 'rss2'.
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*/
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$default_feed = apply_filters( 'default_feed', 'rss2' );
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return 'rss' == $default_feed ? 'rss2' : $default_feed;
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}
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/**
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* Retrieve the blog title for the feed title.
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*
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* @since 2.2.0
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* @since 4.4.0 The optional `$sep` parameter was deprecated and renamed to `$deprecated`.
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*
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* @param string $deprecated Unused..
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* @return string The document title.
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*/
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function get_wp_title_rss( $deprecated = '–' ) {
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if ( '–' !== $deprecated ) {
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/* translators: %s: 'document_title_separator' filter name */
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_deprecated_argument( __FUNCTION__, '4.4.0', sprintf( __( 'Use the %s filter instead.' ), '<code>document_title_separator</code>' ) );
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}
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/**
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* Filter the blog title for use as the feed title.
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*
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* @since 2.2.0
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* @since 4.4.0 The `$sep` parameter was deprecated and renamed to `$deprecated`.
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*
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* @param string $title The current blog title.
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* @param string $deprecated Unused.
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*/
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return apply_filters( 'get_wp_title_rss', wp_get_document_title(), $deprecated );
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}
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/**
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* Display the blog title for display of the feed title.
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*
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* @since 2.2.0
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* @since 4.4.0 The optional `$sep` parameter was deprecated and renamed to `$deprecated`.
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*
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* @param string $deprecated Unused.
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*/
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function wp_title_rss( $deprecated = '–' ) {
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if ( '–' !== $deprecated ) {
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/* translators: %s: 'document_title_separator' filter name */
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_deprecated_argument( __FUNCTION__, '4.4.0', sprintf( __( 'Use the %s filter instead.' ), '<code>document_title_separator</code>' ) );
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}
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/**
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* Filter the blog title for display of the feed title.
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*
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* @since 2.2.0
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* @since 4.4.0 The `$sep` parameter was deprecated and renamed to `$deprecated`.
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*
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* @see get_wp_title_rss()
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*
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* @param string $wp_title_rss The current blog title.
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* @param string $deprecated Unused.
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*/
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echo apply_filters( 'wp_title_rss', get_wp_title_rss(), $deprecated );
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}
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/**
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* Retrieve the current post title for the feed.
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*
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* @since 2.0.0
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*
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* @return string Current post title.
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*/
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function get_the_title_rss() {
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$title = get_the_title();
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/**
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* Filter the post title for use in a feed.
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*
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* @since 1.2.0
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*
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* @param string $title The current post title.
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*/
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$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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* @since 0.71
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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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* @since 2.9.0
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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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/** This filter is documented in wp-includes/post-template.php */
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$content = apply_filters( 'the_content', get_the_content() );
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$content = str_replace(']]>', ']]>', $content);
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/**
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* Filter the post content for use in feeds.
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*
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* @since 2.9.0
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*
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* @param string $content The current post content.
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* @param string $feed_type Type of feed. Possible values include 'rss2', 'atom'.
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* Default 'rss2'.
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*/
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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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* @since 2.9.0
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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($feed_type);
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}
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/**
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* Display the post excerpt for the feed.
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*
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* @since 0.71
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*/
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function the_excerpt_rss() {
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$output = get_the_excerpt();
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/**
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* Filter the post excerpt for a feed.
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*
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* @since 1.2.0
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*
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* @param string $output The current post excerpt.
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*/
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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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* @since 2.3.0
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*/
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function the_permalink_rss() {
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/**
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* Filter the permalink to the post for use in feeds.
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*
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* @since 2.3.0
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*
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* @param string $post_permalink The current post permalink.
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*/
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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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/**
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* Filter the comments permalink for the current post.
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*
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* @since 3.6.0
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*
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* @param string $comment_permalink The current comment permalink with
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* '#comments' appended.
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*/
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echo esc_url( apply_filters( 'comments_link_feed', 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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* @since 2.5.0
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*
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* @param int|WP_Comment $comment_id Optional comment object or id. Defaults to global comment object.
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*/
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function comment_guid($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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* @since 2.5.0
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*
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* @param int|WP_Comment $comment_id Optional comment object or id. Defaults to global comment object.
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* @return false|string false on failure or guid for comment on success.
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*/
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function get_comment_guid($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-' . $comment->comment_ID;
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}
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/**
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* Display the link to the comments.
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*
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* @since 1.5.0
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* @since 4.4.0 Introduced the `$comment` argument.
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*
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* @param int|WP_Comment $comment Optional. Comment object or id. Defaults to global comment object.
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*/
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function comment_link( $comment = null ) {
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/**
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* Filter the current comment's permalink.
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*
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* @since 3.6.0
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*
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* @see get_comment_link()
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*
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* @param string $comment_permalink The current comment permalink.
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*/
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echo esc_url( apply_filters( 'comment_link', get_comment_link( $comment ) ) );
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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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* @since 2.0.0
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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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/**
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* Filter the current comment author for use in a feed.
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*
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* @since 1.5.0
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*
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* @see get_comment_author()
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*
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* @param string $comment_author The current comment author.
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*/
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return apply_filters( 'comment_author_rss', get_comment_author() );
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}
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/**
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* Display the current comment author in the feed.
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*
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* @since 1.0.0
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*/
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function comment_author_rss() {
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echo get_comment_author_rss();
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}
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/**
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* Display the current comment content for use in the feeds.
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*
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* @since 1.0.0
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*/
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function comment_text_rss() {
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$comment_text = get_comment_text();
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/**
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* Filter the current comment content for use in a feed.
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*
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* @since 1.5.0
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*
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* @param string $comment_text The content of the current comment.
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*/
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$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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* @since 2.1.0
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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( get_bloginfo_rss( '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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/**
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* Filter all of the post categories for display in a feed.
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*
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* @since 1.2.0
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*
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* @param string $the_list All of the RSS post categories.
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* @param string $type Type of feed. Possible values include 'rss2', 'atom'.
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* Default 'rss2'.
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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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* @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($type);
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}
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/**
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* Display the HTML type based on the blog setting.
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*
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* The two possible values are either 'xhtml' or 'html'.
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*
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* @since 2.2.0
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*/
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function html_type_rss() {
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$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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* @since 1.5.0
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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", $enc);
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// only get the first element, e.g. audio/mpeg from 'audio/mpeg mpga mp2 mp3'
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$t = preg_split('/[ \t]/', trim($enclosure[2]) );
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$type = $t[0];
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/**
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* Filter the RSS enclosure HTML link tag for the current post.
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*
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* @since 2.2.0
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*
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* @param string $html_link_tag The HTML link tag with a URI and other attributes.
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*/
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echo apply_filters( 'rss_enclosure', '<enclosure url="' . esc_url( trim( $enclosure[0] ) ) . '" length="' . absint( trim( $enclosure[1] ) ) . '" type="' . esc_attr( $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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* @since 2.2.0
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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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/**
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* Filter the atom enclosure HTML link tag for the current post.
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*
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* @since 2.2.0
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*
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* @param string $html_link_tag The HTML link tag with a URI and other attributes.
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*/
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echo apply_filters( 'atom_enclosure', '<link href="' . esc_url( trim( $enclosure[0] ) ) . '" rel="enclosure" length="' . absint( trim( $enclosure[1] ) ) . '" type="' . esc_attr( 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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*
|
||
* @link http://www.atomenabled.org/developers/syndication/atom-format-spec.php#rfc.section.3.1
|
||
*
|
||
* @since 2.5.0
|
||
*
|
||
* @param string $data Input string
|
||
* @return array array(type, value)
|
||
*/
|
||
function prep_atom_text_construct($data) {
|
||
if (strpos($data, '<') === false && strpos($data, '&') === false) {
|
||
return array('text', $data);
|
||
}
|
||
|
||
$parser = xml_parser_create();
|
||
xml_parse($parser, '<div>' . $data . '</div>', true);
|
||
$code = xml_get_error_code($parser);
|
||
xml_parser_free($parser);
|
||
|
||
if (!$code) {
|
||
if (strpos($data, '<') === false) {
|
||
return array('text', $data);
|
||
} else {
|
||
$data = "<div xmlns='http://www.w3.org/1999/xhtml'>$data</div>";
|
||
return array('xhtml', $data);
|
||
}
|
||
}
|
||
|
||
if (strpos($data, ']]>') === false) {
|
||
return array('html', "<![CDATA[$data]]>");
|
||
} else {
|
||
return array('html', htmlspecialchars($data));
|
||
}
|
||
}
|
||
|
||
/**
|
||
* Displays Site Icon in atom feeds.
|
||
*
|
||
* @since 4.3.0
|
||
*
|
||
* @see get_site_icon_url()
|
||
*/
|
||
function atom_site_icon() {
|
||
$url = get_site_icon_url( 32 );
|
||
if ( $url ) {
|
||
echo "<icon>$url</icon>\n";
|
||
}
|
||
}
|
||
|
||
/**
|
||
* Displays Site Icon in RSS2.
|
||
*
|
||
* @since 4.3.0
|
||
*/
|
||
function rss2_site_icon() {
|
||
$rss_title = get_wp_title_rss();
|
||
if ( empty( $rss_title ) ) {
|
||
$rss_title = get_bloginfo_rss( 'name' );
|
||
}
|
||
|
||
$url = get_site_icon_url( 32 );
|
||
if ( $url ) {
|
||
echo '
|
||
<image>
|
||
<url>' . convert_chars( $url ) . '</url>
|
||
<title>' . $rss_title . '</title>
|
||
<link>' . get_bloginfo_rss( 'url' ) . '</link>
|
||
<width>32</width>
|
||
<height>32</height>
|
||
</image> ' . "\n";
|
||
}
|
||
}
|
||
|
||
/**
|
||
* Display the link for the currently displayed feed in a XSS safe way.
|
||
*
|
||
* Generate a correct link for the atom:self element.
|
||
*
|
||
* @since 2.5.0
|
||
*/
|
||
function self_link() {
|
||
$host = @parse_url(home_url());
|
||
/**
|
||
* Filter the current feed URL.
|
||
*
|
||
* @since 3.6.0
|
||
*
|
||
* @see set_url_scheme()
|
||
* @see wp_unslash()
|
||
*
|
||
* @param string $feed_link The link for the feed with set URL scheme.
|
||
*/
|
||
echo esc_url( apply_filters( 'self_link', set_url_scheme( 'http://' . $host['host'] . wp_unslash( $_SERVER['REQUEST_URI'] ) ) ) );
|
||
}
|
||
|
||
/**
|
||
* Return the content type for specified feed type.
|
||
*
|
||
* @since 2.8.0
|
||
*
|
||
* @param string $type Type of feed. Possible values include 'rss', rss2', 'atom', and 'rdf'.
|
||
*/
|
||
function feed_content_type( $type = '' ) {
|
||
if ( empty($type) )
|
||
$type = get_default_feed();
|
||
|
||
$types = array(
|
||
'rss' => 'application/rss+xml',
|
||
'rss2' => 'application/rss+xml',
|
||
'rss-http' => 'text/xml',
|
||
'atom' => 'application/atom+xml',
|
||
'rdf' => 'application/rdf+xml'
|
||
);
|
||
|
||
$content_type = ( !empty($types[$type]) ) ? $types[$type] : 'application/octet-stream';
|
||
|
||
/**
|
||
* Filter the content type for a specific feed type.
|
||
*
|
||
* @since 2.8.0
|
||
*
|
||
* @param string $content_type Content type indicating the type of data that a feed contains.
|
||
* @param string $type Type of feed. Possible values include 'rss', rss2', 'atom', and 'rdf'.
|
||
*/
|
||
return apply_filters( 'feed_content_type', $content_type, $type );
|
||
}
|
||
|
||
/**
|
||
* Build SimplePie object based on RSS or Atom feed from URL.
|
||
*
|
||
* @since 2.8.0
|
||
*
|
||
* @param mixed $url URL of feed to retrieve. If an array of URLs, the feeds are merged
|
||
* using SimplePie's multifeed feature.
|
||
* See also {@link http://simplepie.org/wiki/faq/typical_multifeed_gotchas}
|
||
*
|
||
* @return WP_Error|SimplePie WP_Error object on failure or SimplePie object on success
|
||
*/
|
||
function fetch_feed( $url ) {
|
||
require_once( ABSPATH . WPINC . '/class-feed.php' );
|
||
|
||
$feed = new SimplePie();
|
||
|
||
$feed->set_sanitize_class( 'WP_SimplePie_Sanitize_KSES' );
|
||
// We must manually overwrite $feed->sanitize because SimplePie's
|
||
// constructor sets it before we have a chance to set the sanitization class
|
||
$feed->sanitize = new WP_SimplePie_Sanitize_KSES();
|
||
|
||
$feed->set_cache_class( 'WP_Feed_Cache' );
|
||
$feed->set_file_class( 'WP_SimplePie_File' );
|
||
|
||
$feed->set_feed_url( $url );
|
||
/** This filter is documented in wp-includes/class-feed.php */
|
||
$feed->set_cache_duration( apply_filters( 'wp_feed_cache_transient_lifetime', 12 * HOUR_IN_SECONDS, $url ) );
|
||
/**
|
||
* Fires just before processing the SimplePie feed object.
|
||
*
|
||
* @since 3.0.0
|
||
*
|
||
* @param object &$feed SimplePie feed object, passed by reference.
|
||
* @param mixed $url URL of feed to retrieve. If an array of URLs, the feeds are merged.
|
||
*/
|
||
do_action_ref_array( 'wp_feed_options', array( &$feed, $url ) );
|
||
$feed->init();
|
||
$feed->set_output_encoding( get_option( 'blog_charset' ) );
|
||
$feed->handle_content_type();
|
||
|
||
if ( $feed->error() )
|
||
return new WP_Error( 'simplepie-error', $feed->error() );
|
||
|
||
return $feed;
|
||
}
|