331 lines
10 KiB
PHP
331 lines
10 KiB
PHP
<?php
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/**
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* API for easily embedding rich media such as videos and images into content.
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*
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* @package WordPress
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* @subpackage Embed
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* @since 2.9.0
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*/
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class WP_Embed {
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var $handlers = array();
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var $post_ID;
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var $usecache = true;
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var $linkifunknown = true;
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/**
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* Constructor
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*/
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function __construct() {
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// Hack to get the [embed] shortcode to run before wpautop()
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add_filter( 'the_content', array( $this, 'run_shortcode' ), 8 );
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// Shortcode placeholder for strip_shortcodes()
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add_shortcode( 'embed', '__return_false' );
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// Attempts to embed all URLs in a post
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add_filter( 'the_content', array( $this, 'autoembed' ), 8 );
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// When a post is saved, invalidate the oEmbed cache
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add_action( 'pre_post_update', array( $this, 'delete_oembed_caches' ) );
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// After a post is saved, cache oEmbed items via AJAX
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add_action( 'edit_form_advanced', array( $this, 'maybe_run_ajax_cache' ) );
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}
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/**
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* Process the [embed] shortcode.
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*
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* Since the [embed] shortcode needs to be run earlier than other shortcodes,
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* this function removes all existing shortcodes, registers the [embed] shortcode,
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* calls {@link do_shortcode()}, and then re-registers the old shortcodes.
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*
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* @uses $shortcode_tags
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* @uses remove_all_shortcodes()
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* @uses add_shortcode()
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* @uses do_shortcode()
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*
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* @param string $content Content to parse
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* @return string Content with shortcode parsed
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*/
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function run_shortcode( $content ) {
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global $shortcode_tags;
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// Back up current registered shortcodes and clear them all out
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$orig_shortcode_tags = $shortcode_tags;
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remove_all_shortcodes();
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add_shortcode( 'embed', array( $this, 'shortcode' ) );
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// Do the shortcode (only the [embed] one is registered)
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$content = do_shortcode( $content, true );
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// Put the original shortcodes back
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$shortcode_tags = $orig_shortcode_tags;
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return $content;
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}
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/**
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* If a post/page was saved, then output JavaScript to make
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* an AJAX request that will call WP_Embed::cache_oembed().
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*/
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function maybe_run_ajax_cache() {
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$post = get_post();
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if ( ! $post || empty($_GET['message']) || 1 != $_GET['message'] )
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return;
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?>
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<script type="text/javascript">
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/* <![CDATA[ */
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jQuery(document).ready(function($){
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$.get("<?php echo admin_url( 'admin-ajax.php?action=oembed-cache&post=' . $post->ID, 'relative' ); ?>");
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});
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/* ]]> */
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</script>
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<?php
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}
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/**
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* Register an embed handler. Do not use this function directly, use {@link wp_embed_register_handler()} instead.
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* This function should probably also only be used for sites that do not support oEmbed.
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*
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* @param string $id An internal ID/name for the handler. Needs to be unique.
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* @param string $regex The regex that will be used to see if this handler should be used for a URL.
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* @param callback $callback The callback function that will be called if the regex is matched.
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* @param int $priority Optional. Used to specify the order in which the registered handlers will be tested (default: 10). Lower numbers correspond with earlier testing, and handlers with the same priority are tested in the order in which they were added to the action.
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*/
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function register_handler( $id, $regex, $callback, $priority = 10 ) {
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$this->handlers[$priority][$id] = array(
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'regex' => $regex,
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'callback' => $callback,
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);
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}
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/**
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* Unregister a previously registered embed handler. Do not use this function directly, use {@link wp_embed_unregister_handler()} instead.
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*
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* @param string $id The handler ID that should be removed.
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* @param int $priority Optional. The priority of the handler to be removed (default: 10).
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*/
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function unregister_handler( $id, $priority = 10 ) {
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if ( isset($this->handlers[$priority][$id]) )
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unset($this->handlers[$priority][$id]);
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}
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/**
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* The {@link do_shortcode()} callback function.
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*
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* Attempts to convert a URL into embed HTML. Starts by checking the URL against the regex of the registered embed handlers.
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* If none of the regex matches and it's enabled, then the URL will be given to the {@link WP_oEmbed} class.
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*
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* @uses wp_oembed_get()
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* @uses wp_parse_args()
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* @uses wp_embed_defaults()
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* @uses WP_Embed::maybe_make_link()
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* @uses get_option()
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* @uses author_can()
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* @uses wp_cache_get()
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* @uses wp_cache_set()
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* @uses get_post_meta()
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* @uses update_post_meta()
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*
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* @param array $attr Shortcode attributes.
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* @param string $url The URL attempting to be embedded.
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* @return string The embed HTML on success, otherwise the original URL.
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*/
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function shortcode( $attr, $url = '' ) {
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$post = get_post();
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if ( empty( $url ) )
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return '';
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$rawattr = $attr;
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$attr = wp_parse_args( $attr, wp_embed_defaults() );
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// kses converts & into & and we need to undo this
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// See http://core.trac.wordpress.org/ticket/11311
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$url = str_replace( '&', '&', $url );
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// Look for known internal handlers
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ksort( $this->handlers );
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foreach ( $this->handlers as $priority => $handlers ) {
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foreach ( $handlers as $id => $handler ) {
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if ( preg_match( $handler['regex'], $url, $matches ) && is_callable( $handler['callback'] ) ) {
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if ( false !== $return = call_user_func( $handler['callback'], $matches, $attr, $url, $rawattr ) )
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/**
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* Filter the returned embed handler.
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*
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* @since 2.9.0
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*
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* @param mixed $return The shortcode callback function to call.
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* @param string $url The attempted embed URL.
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* @param array $attr An array of shortcode attributes.
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*/
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return apply_filters( 'embed_handler_html', $return, $url, $attr );
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}
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}
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}
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$post_ID = ( ! empty( $post->ID ) ) ? $post->ID : null;
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if ( ! empty( $this->post_ID ) ) // Potentially set by WP_Embed::cache_oembed()
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$post_ID = $this->post_ID;
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// Unknown URL format. Let oEmbed have a go.
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if ( $post_ID ) {
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// Check for a cached result (stored in the post meta)
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$cachekey = '_oembed_' . md5( $url . serialize( $attr ) );
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if ( $this->usecache ) {
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$cache = get_post_meta( $post_ID, $cachekey, true );
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// Failures are cached
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if ( '{{unknown}}' === $cache )
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return $this->maybe_make_link( $url );
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if ( ! empty( $cache ) )
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/**
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* Filter the cached oEmbed HTML.
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*
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* @since 2.9.0
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*
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* @param mixed $cache The cached HTML result, stored in post meta.
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* @param string $url The attempted embed URL.
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* @param array $attr An array of shortcode attributes.
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* @param int $post_ID Post ID.
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*/
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return apply_filters( 'embed_oembed_html', $cache, $url, $attr, $post_ID );
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}
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/**
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* Filter whether to inspect the given URL for discoverable <link> tags.
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*
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* @see WP_oEmbed::discover()
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*
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* @param bool false Whether to enable <link> tag discovery. Default false.
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*/
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$attr['discover'] = ( apply_filters( 'embed_oembed_discover', false ) && author_can( $post_ID, 'unfiltered_html' ) );
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// Use oEmbed to get the HTML
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$html = wp_oembed_get( $url, $attr );
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// Cache the result
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$cache = ( $html ) ? $html : '{{unknown}}';
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update_post_meta( $post_ID, $cachekey, $cache );
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// If there was a result, return it
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if ( $html ) {
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/** This filter is documented in wp-includes/class-wp-embed.php */
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return apply_filters( 'embed_oembed_html', $html, $url, $attr, $post_ID );
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}
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}
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// Still unknown
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return $this->maybe_make_link( $url );
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}
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/**
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* Delete all oEmbed caches.
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*
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* @param int $post_ID Post ID to delete the caches for.
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*/
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function delete_oembed_caches( $post_ID ) {
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$post_metas = get_post_custom_keys( $post_ID );
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if ( empty($post_metas) )
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return;
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foreach( $post_metas as $post_meta_key ) {
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if ( '_oembed_' == substr( $post_meta_key, 0, 8 ) )
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delete_post_meta( $post_ID, $post_meta_key );
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}
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}
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/**
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* Triggers a caching of all oEmbed results.
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*
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* @param int $post_ID Post ID to do the caching for.
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*/
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function cache_oembed( $post_ID ) {
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$post = get_post( $post_ID );
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$post_types = array( 'post', 'page' );
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/**
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* Filter the array of post types to cache oEmbed results for.
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*
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* @since 2.9.0
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*
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* @param array $post_types Array of post types to cache oEmbed results for. Default 'post', 'page'.
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*/
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if ( empty($post->ID) || !in_array( $post->post_type, apply_filters( 'embed_cache_oembed_types', $post_types ) ) )
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return;
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// Trigger a caching
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if ( !empty($post->post_content) ) {
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$this->post_ID = $post->ID;
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$this->usecache = false;
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$content = $this->run_shortcode( $post->post_content );
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$this->autoembed( $content );
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$this->usecache = true;
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}
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}
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/**
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* Passes any unlinked URLs that are on their own line to {@link WP_Embed::shortcode()} for potential embedding.
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*
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* @uses WP_Embed::autoembed_callback()
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*
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* @param string $content The content to be searched.
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* @return string Potentially modified $content.
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*/
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function autoembed( $content ) {
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// Replace line breaks from all HTML elements with placeholders.
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$content = wp_replace_in_html_tags( $content, array( "\n" => '<!-- wp-line-break -->' ) );
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// Find URLs that are on their own line.
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$content = preg_replace_callback( '|^\s*(https?://[^\s"]+)\s*$|im', array( $this, 'autoembed_callback' ), $content );
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// Put the line breaks back.
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return str_replace( '<!-- wp-line-break -->', "\n", $content );
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}
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/**
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* Callback function for {@link WP_Embed::autoembed()}.
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*
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* @uses WP_Embed::shortcode()
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*
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* @param array $match A regex match array.
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* @return string The embed HTML on success, otherwise the original URL.
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*/
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function autoembed_callback( $match ) {
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$oldval = $this->linkifunknown;
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$this->linkifunknown = false;
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$return = $this->shortcode( array(), $match[1] );
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$this->linkifunknown = $oldval;
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return "\n$return\n";
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}
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/**
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* Conditionally makes a hyperlink based on an internal class variable.
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*
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* @param string $url URL to potentially be linked.
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* @return string Linked URL or the original URL.
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*/
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function maybe_make_link( $url ) {
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$output = ( $this->linkifunknown ) ? '<a href="' . esc_url($url) . '">' . esc_html($url) . '</a>' : $url;
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/**
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* Filter the returned, maybe-linked embed URL.
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*
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* @since 2.9.0
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*
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* @param string $output The linked or original URL.
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* @param string $url The original URL.
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*/
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return apply_filters( 'embed_maybe_make_link', $output, $url );
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}
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}
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$GLOBALS['wp_embed'] = new WP_Embed();
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