499 lines
14 KiB
PHP
499 lines
14 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 a URL cannot be embedded, return false instead of returning a link
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* or the URL.
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*
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* Bypasses the {@see 'embed_maybe_make_link'} filter.
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*
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* @var bool
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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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add_filter( 'widget_text_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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add_filter( 'widget_text_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 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( $_GET['message'] ) ) {
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return;
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}
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?>
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<script type="text/javascript">
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jQuery(document).ready(function($){
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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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* Registers an embed handler.
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*
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* Do not use this function directly, use wp_embed_register_handler() instead.
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*
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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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* Unregisters a previously-registered embed handler.
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*
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* Do not use this function directly, use 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 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
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* the registered embed handlers. If none of the regex matches and it's enabled, then the URL
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* will be given to the 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( $handler['callback'] ) ) {
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$return = call_user_func( $handler['callback'], $matches, $attr, $url, $rawattr );
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if ( false !== $return ) {
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/**
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* Filters the returned embed 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 string|false $return The HTML result of the shortcode, or false on failure.
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* @param string $url The 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, $attr );
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}
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}
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}
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}
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$post_ID = ( ! empty( $post->ID ) ) ? $post->ID : null;
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// Potentially set by WP_Embed::cache_oembed().
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if ( ! empty( $this->post_ID ) ) {
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$post_ID = $this->post_ID;
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}
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// Check for a cached result (stored as custom post or in the post meta).
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$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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* Filters 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 = '';
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$cache_time = 0;
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$cached_post_id = $this->find_oembed_post_id( $key_suffix );
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if ( $post_ID ) {
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$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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} elseif ( $cached_post_id ) {
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$cached_post = get_post( $cached_post_id );
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$cache = $cached_post->post_content;
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$cache_time = strtotime( $cached_post->post_modified_gmt );
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}
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$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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}
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if ( ! empty( $cache ) ) {
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/**
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* Filters 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 string|false $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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* Filters 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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if ( $post_ID ) {
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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, $cachekey, '{{unknown}}' );
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}
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} else {
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$has_kses = false !== has_filter( 'content_save_pre', 'wp_filter_post_kses' );
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if ( $has_kses ) {
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// Prevent KSES from corrupting JSON in post_content.
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kses_remove_filters();
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}
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$insert_post_args = array(
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'post_name' => $key_suffix,
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'post_status' => 'publish',
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'post_type' => 'oembed_cache',
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);
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if ( $html ) {
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if ( $cached_post_id ) {
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wp_update_post(
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wp_slash(
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array(
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'ID' => $cached_post_id,
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'post_content' => $html,
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)
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)
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);
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} else {
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wp_insert_post(
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wp_slash(
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array_merge(
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$insert_post_args,
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array(
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'post_content' => $html,
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)
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)
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)
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);
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}
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} elseif ( ! $cache ) {
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wp_insert_post(
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wp_slash(
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array_merge(
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$insert_post_args,
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array(
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'post_content' => '{{unknown}}',
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)
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)
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)
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);
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}
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if ( $has_kses ) {
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kses_init_filters();
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}
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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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// 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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}
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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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/**
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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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* Filters 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 string[] $post_types Array of post type names 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 WP_Embed::shortcode() for potential embedding.
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*
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* @see 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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if ( preg_match( '#(^|\s|>)https?://#i', $content ) ) {
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// Find URLs on their own line.
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$content = preg_replace_callback( '|^(\s*)(https?://[^\s<>"]+)(\s*)$|im', array( $this, 'autoembed_callback' ), $content );
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// Find URLs in their own paragraph.
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$content = preg_replace_callback( '|(<p(?: [^>]*)?>\s*)(https?://[^\s<>"]+)(\s*<\/p>)|i', array( $this, 'autoembed_callback' ), $content );
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}
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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 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 string|false 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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* Filters 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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* Find the oEmbed cache post ID for a given cache key.
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*
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* @since 4.9.0
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*
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* @param string $cache_key oEmbed cache key.
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* @return int|null Post ID on success, null on failure.
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*/
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public function find_oembed_post_id( $cache_key ) {
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$cache_group = 'oembed_cache_post';
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$oembed_post_id = wp_cache_get( $cache_key, $cache_group );
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if ( $oembed_post_id && 'oembed_cache' === get_post_type( $oembed_post_id ) ) {
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return $oembed_post_id;
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}
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$oembed_post_query = new WP_Query(
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array(
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'post_type' => 'oembed_cache',
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'post_status' => 'publish',
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'name' => $cache_key,
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'posts_per_page' => 1,
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'no_found_rows' => true,
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'cache_results' => true,
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'update_post_meta_cache' => false,
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'update_post_term_cache' => false,
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'lazy_load_term_meta' => false,
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)
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);
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if ( ! empty( $oembed_post_query->posts ) ) {
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// Note: 'fields' => 'ids' is not being used in order to cache the post object as it will be needed.
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$oembed_post_id = $oembed_post_query->posts[0]->ID;
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wp_cache_set( $cache_key, $oembed_post_id, $cache_group );
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return $oembed_post_id;
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}
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return null;
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}
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}
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