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For the past 6 years, WordPress has operated as an oEmbed consumer, allowing users to easily embed content from other sites. By adding oEmbed provider support, this allows any oEmbed consumer to embed posts from WordPress sites. In addition to creating an oEmbed provider, WordPress' oEmbed consumer code has been enhanced to work with any site that provides oEmbed data (as long as it matches some strict security rules), and provides a preview from within the post editor. For security, embeds appear within a sandboxed iframe - the iframe content is a template that can be styled or replaced entirely by the theme on the provider site. Props swissspidy, pento, melchoyce, netweb, pfefferle, johnbillion, extendwings, davidbinda, danielbachhuber, SergeyBiryukov, afercia Fixes #32522. Built from https://develop.svn.wordpress.org/trunk@34903 git-svn-id: http://core.svn.wordpress.org/trunk@34868 1a063a9b-81f0-0310-95a4-ce76da25c4cd
373 lines
12 KiB
PHP
373 lines
12 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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public $handlers = array();
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public $post_ID;
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public $usecache = true;
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public $linkifunknown = true;
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public $last_attr = array();
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public $last_url = '';
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/**
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* When an URL cannot be embedded, return false instead of returning a link
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* or the URL. Bypasses the 'embed_maybe_make_link' filter.
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*/
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public $return_false_on_fail = false;
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/**
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* Constructor
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*/
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public 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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// 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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add_action( 'edit_page_form', 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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* @global array $shortcode_tags
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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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public 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 $content;
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}
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/**
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* If a post/page was saved, then output JavaScript to make
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* an AJAX request that will call WP_Embed::cache_oembed().
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*/
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public function maybe_run_ajax_cache() {
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$post = get_post();
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if ( ! $post || empty( $_GET['message'] ) )
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return;
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?>
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<script type="text/javascript">
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jQuery(document).ready(function($){
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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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</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 callable $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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public 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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public function unregister_handler( $id, $priority = 10 ) {
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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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* @param array $attr {
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* Shortcode attributes. Optional.
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*
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* @type int $width Width of the embed in pixels.
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* @type int $height Height of the embed in pixels.
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* }
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* @param string $url The URL attempting to be embedded.
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* @return string|false The embed HTML on success, otherwise the original URL.
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* `->maybe_make_link()` can return false on failure.
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*/
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public function shortcode( $attr, $url = '' ) {
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$post = get_post();
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if ( empty( $url ) && ! empty( $attr['src'] ) ) {
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$url = $attr['src'];
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}
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$this->last_url = $url;
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if ( empty( $url ) ) {
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$this->last_attr = $attr;
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return '';
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}
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$rawattr = $attr;
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$attr = wp_parse_args( $attr, wp_embed_defaults( $url ) );
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$this->last_attr = $attr;
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// kses converts & into & and we need to undo this
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// See https://core.trac.wordpress.org/ticket/11311
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$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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* @see WP_Embed::shortcode()
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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 ( $post_ID ) {
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// Check for a cached result (stored in the post meta)
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$key_suffix = md5( $url . serialize( $attr ) );
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$cachekey = '_oembed_' . $key_suffix;
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$cachekey_time = '_oembed_time_' . $key_suffix;
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/**
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* Filter the oEmbed TTL value (time to live).
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*
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* @since 4.0.0
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*
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* @param int $time Time to live (in seconds).
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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 $post_ID Post ID.
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*/
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$ttl = apply_filters( 'oembed_ttl', DAY_IN_SECONDS, $url, $attr, $post_ID );
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$cache = get_post_meta( $post_ID, $cachekey, true );
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$cache_time = get_post_meta( $post_ID, $cachekey_time, true );
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if ( ! $cache_time ) {
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$cache_time = 0;
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}
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$cached_recently = ( time() - $cache_time ) < $ttl;
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if ( $this->usecache || $cached_recently ) {
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// Failures are cached. Serve one if we're using the cache.
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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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* @see WP_Embed::shortcode()
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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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/**
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* Filter whether to inspect the given URL for discoverable link tags.
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*
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* @since 2.9.0
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* @since 4.4.0 The default value changed to true.
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*
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* @see WP_oEmbed::discover()
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*
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* @param bool $enable Whether to enable `<link>` tag discovery. Default true.
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*/
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$attr['discover'] = ( apply_filters( 'embed_oembed_discover', true ) );
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// Use oEmbed to get the HTML
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$html = wp_oembed_get( $url, $attr );
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// Maybe cache the result
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if ( $html ) {
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update_post_meta( $post_ID, $cachekey, $html );
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update_post_meta( $post_ID, $cachekey_time, time() );
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} elseif ( ! $cache ) {
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update_post_meta( $post_ID, $cachekey, '{{unknown}}' );
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}
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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. Unused by core as of 4.0.0.
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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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public 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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public function cache_oembed( $post_ID ) {
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$post = get_post( $post_ID );
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$post_types = get_post_types( array( 'show_ui' => true ) );
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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. Defaults to post types with `show_ui` set to true.
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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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}
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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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public 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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* @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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public 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(), $match[2] );
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$this->linkifunknown = $oldval;
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return $match[1] . $return . $match[3];
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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 false|string Linked URL or the original URL. False if 'return_false_on_fail' is true.
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*/
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public function maybe_make_link( $url ) {
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if ( $this->return_false_on_fail ) {
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return false;
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}
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$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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