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https://github.com/WordPress/WordPress.git
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952b6873e7
SimplePie can set the Content-Type header automatically with the correct charset for convenience, but we already force the charset to match the site's, making it redundant at best. At worst, SimplePie incorrectly overrides the content-type for non-HTML content (such as API requests). Props dlh, stevenkword. Fixes #39066. Built from https://develop.svn.wordpress.org/trunk@39681 git-svn-id: http://core.svn.wordpress.org/trunk@39621 1a063a9b-81f0-0310-95a4-ce76da25c4cd
711 lines
19 KiB
PHP
711 lines
19 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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* @since 2.1.0
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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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* Filters 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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* Filters 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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* {@see '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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* Filters 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 ( '–' !== $deprecated ) {
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/* translators: %s: 'document_title_separator' filter name */
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_deprecated_argument( __FUNCTION__, '4.4.0', sprintf( __( 'Use the %s filter instead.' ), '<code>document_title_separator</code>' ) );
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}
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/**
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* Filters the blog title for use as the feed title.
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*
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* @since 2.2.0
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* @since 4.4.0 The `$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 ( '–' !== $deprecated ) {
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/* translators: %s: 'document_title_separator' filter name */
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_deprecated_argument( __FUNCTION__, '4.4.0', sprintf( __( 'Use the %s filter instead.' ), '<code>document_title_separator</code>' ) );
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}
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/**
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* Filters the blog title for display of the feed title.
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*
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* @since 2.2.0
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* @since 4.4.0 The `$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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* Filters 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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* Filters 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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* Filters 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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* Filters 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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* Filters 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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* Filters 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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* Filters 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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* Filters 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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* Filters 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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* Filters 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="' . 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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* @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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* Filters 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="' . 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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/**
|
||
* Determine the type of a string of data with the data formatted.
|
||
*
|
||
* Tell whether the type is text, html, or xhtml, per RFC 4287 section 3.1.
|
||
*
|
||
* In the case of WordPress, text is defined as containing no markup,
|
||
* xhtml is defined as "well formed", and html as tag soup (i.e., the rest).
|
||
*
|
||
* Container div tags are added to xhtml values, per section 3.1.1.3.
|
||
*
|
||
* @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', $data);
|
||
}
|
||
|
||
if ( ! function_exists( 'xml_parser_create' ) ) {
|
||
trigger_error( __( "PHP's XML extension is not available. Please contact your hosting provider to enable PHP's XML extension." ) );
|
||
|
||
return array( 'html', "<![CDATA[$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());
|
||
/**
|
||
* Filters 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';
|
||
|
||
/**
|
||
* Filters 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 ) {
|
||
if ( ! class_exists( 'SimplePie', false ) ) {
|
||
require_once( ABSPATH . WPINC . '/class-simplepie.php' );
|
||
}
|
||
|
||
require_once( ABSPATH . WPINC . '/class-wp-feed-cache.php' );
|
||
require_once( ABSPATH . WPINC . '/class-wp-feed-cache-transient.php' );
|
||
require_once( ABSPATH . WPINC . '/class-wp-simplepie-file.php' );
|
||
require_once( ABSPATH . WPINC . '/class-wp-simplepie-sanitize-kses.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-wp-feed-cache-transient.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' ) );
|
||
|
||
if ( $feed->error() )
|
||
return new WP_Error( 'simplepie-error', $feed->error() );
|
||
|
||
return $feed;
|
||
}
|