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<?php /** * API for easily embedding rich media such as videos and images into content. * * @package WordPress * @subpackage Embed * @since 2.9.0 */ class WP_Embed { public $handlers = array(); public $post_ID; public $usecache = true; public $linkifunknown = true; public $last_attr = array(); public $last_url = ''; /** * When a URL cannot be embedded, return false instead of returning a link * or the URL. * * Bypasses the {@see 'embed_maybe_make_link'} filter. * * @var bool */ public $return_false_on_fail = false; /** * Constructor */ public function __construct() { // Hack to get the [embed] shortcode to run before wpautop() add_filter( 'the_content', array( $this, 'run_shortcode' ), 8 ); add_filter( 'widget_text_content', array( $this, 'run_shortcode' ), 8 ); // Shortcode placeholder for strip_shortcodes() add_shortcode( 'embed', '__return_false' ); // Attempts to embed all URLs in a post add_filter( 'the_content', array( $this, 'autoembed' ), 8 ); add_filter( 'widget_text_content', array( $this, 'autoembed' ), 8 ); // After a post is saved, cache oEmbed items via Ajax add_action( 'edit_form_advanced', array( $this, 'maybe_run_ajax_cache' ) ); add_action( 'edit_page_form', array( $this, 'maybe_run_ajax_cache' ) ); } /** * Process the [embed] shortcode. * * Since the [embed] shortcode needs to be run earlier than other shortcodes, * this function removes all existing shortcodes, registers the [embed] shortcode, * calls do_shortcode(), and then re-registers the old shortcodes. * * @global array $shortcode_tags * * @param string $content Content to parse * @return string Content with shortcode parsed */ public function run_shortcode( $content ) { global $shortcode_tags; // Back up current registered shortcodes and clear them all out $orig_shortcode_tags = $shortcode_tags; remove_all_shortcodes(); add_shortcode( 'embed', array( $this, 'shortcode' ) ); // Do the shortcode (only the [embed] one is registered) $content = do_shortcode( $content, true ); // Put the original shortcodes back $shortcode_tags = $orig_shortcode_tags; return $content; } /** * If a post/page was saved, then output JavaScript to make * an Ajax request that will call WP_Embed::cache_oembed(). */ public function maybe_run_ajax_cache() { $post = get_post(); if ( ! $post || empty( $_GET['message'] ) ) return; ?> <script type="text/javascript"> jQuery(document).ready(function($){ $.get("<?php echo admin_url( 'admin-ajax.php?action=oembed-cache&post=' . $post->ID, 'relative' ); ?>"); }); </script> <?php } /** * Registers an embed handler. * * Do not use this function directly, use wp_embed_register_handler() instead. * * This function should probably also only be used for sites that do not support oEmbed. * * @param string $id An internal ID/name for the handler. Needs to be unique. * @param string $regex The regex that will be used to see if this handler should be used for a URL. * @param callable $callback The callback function that will be called if the regex is matched. * @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. */ public function register_handler( $id, $regex, $callback, $priority = 10 ) { $this->handlers[$priority][$id] = array( 'regex' => $regex, 'callback' => $callback, ); } /** * Unregisters a previously-registered embed handler. * * Do not use this function directly, use wp_embed_unregister_handler() instead. * * @param string $id The handler ID that should be removed. * @param int $priority Optional. The priority of the handler to be removed (default: 10). */ public function unregister_handler( $id, $priority = 10 ) { unset( $this->handlers[ $priority ][ $id ] ); } /** * The do_shortcode() callback function. * * Attempts to convert a URL into embed HTML. Starts by checking the URL against the regex of * the registered embed handlers. If none of the regex matches and it's enabled, then the URL * will be given to the WP_oEmbed class. * * @param array $attr { * Shortcode attributes. Optional. * * @type int $width Width of the embed in pixels. * @type int $height Height of the embed in pixels. * } * @param string $url The URL attempting to be embedded. * @return string|false The embed HTML on success, otherwise the original URL. * `->maybe_make_link()` can return false on failure. */ public function shortcode( $attr, $url = '' ) { $post = get_post(); if ( empty( $url ) && ! empty( $attr['src'] ) ) { $url = $attr['src']; } $this->last_url = $url; if ( empty( $url ) ) { $this->last_attr = $attr; return ''; } $rawattr = $attr; $attr = wp_parse_args( $attr, wp_embed_defaults( $url ) ); $this->last_attr = $attr; // kses converts & into & and we need to undo this // See https://core.trac.wordpress.org/ticket/11311 $url = str_replace( '&', '&', $url ); // Look for known internal handlers ksort( $this->handlers ); foreach ( $this->handlers as $priority => $handlers ) { foreach ( $handlers as $id => $handler ) { if ( preg_match( $handler['regex'], $url, $matches ) && is_callable( $handler['callback'] ) ) { if ( false !== $return = call_user_func( $handler['callback'], $matches, $attr, $url, $rawattr ) ) /** * Filters the returned embed handler. * * @since 2.9.0 * * @see WP_Embed::shortcode() * * @param mixed $return The shortcode callback function to call. * @param string $url The attempted embed URL. * @param array $attr An array of shortcode attributes. */ return apply_filters( 'embed_handler_html', $return, $url, $attr ); } } } $post_ID = ( ! empty( $post->ID ) ) ? $post->ID : null; // Potentially set by WP_Embed::cache_oembed(). if ( ! empty( $this->post_ID ) ) { $post_ID = $this->post_ID; } // Check for a cached result (stored as custom post or in the post meta). $key_suffix = md5( $url . serialize( $attr ) ); $cachekey = '_oembed_' . $key_suffix; $cachekey_time = '_oembed_time_' . $key_suffix; /** * Filters the oEmbed TTL value (time to live). * * @since 4.0.0 * * @param int $time Time to live (in seconds). * @param string $url The attempted embed URL. * @param array $attr An array of shortcode attributes. * @param int $post_ID Post ID. */ $ttl = apply_filters( 'oembed_ttl', DAY_IN_SECONDS, $url, $attr, $post_ID ); $cache = ''; $cache_time = 0; $cached_post_id = $this->find_oembed_post_id( $key_suffix ); if ( $post_ID ) { $cache = get_post_meta( $post_ID, $cachekey, true ); $cache_time = get_post_meta( $post_ID, $cachekey_time, true ); if ( ! $cache_time ) { $cache_time = 0; } } elseif ( $cached_post_id ) { $cached_post = get_post( $cached_post_id ); $cache = $cached_post->post_content; $cache_time = strtotime( $cached_post->post_modified_gmt ); } $cached_recently = ( time() - $cache_time ) < $ttl; if ( $this->usecache || $cached_recently ) { // Failures are cached. Serve one if we're using the cache. if ( '{{unknown}}' === $cache ) { return $this->maybe_make_link( $url ); } if ( ! empty( $cache ) ) { /** * Filters the cached oEmbed HTML. * * @since 2.9.0 * * @see WP_Embed::shortcode() * * @param mixed $cache The cached HTML result, stored in post meta. * @param string $url The attempted embed URL. * @param array $attr An array of shortcode attributes. * @param int $post_ID Post ID. */ return apply_filters( 'embed_oembed_html', $cache, $url, $attr, $post_ID ); } } /** * Filters whether to inspect the given URL for discoverable link tags. * * @since 2.9.0 * @since 4.4.0 The default value changed to true. * * @see WP_oEmbed::discover() * * @param bool $enable Whether to enable `<link>` tag discovery. Default true. */ $attr['discover'] = apply_filters( 'embed_oembed_discover', true ); // Use oEmbed to get the HTML. $html = wp_oembed_get( $url, $attr ); if ( $post_ID ) { if ( $html ) { update_post_meta( $post_ID, $cachekey, $html ); update_post_meta( $post_ID, $cachekey_time, time() ); } elseif ( ! $cache ) { update_post_meta( $post_ID, $cachekey, '{{unknown}}' ); } } else { $has_kses = false !== has_filter( 'content_save_pre', 'wp_filter_post_kses' ); if ( $has_kses ) { // Prevent KSES from corrupting JSON in post_content. kses_remove_filters(); } $insert_post_args = array( 'post_name' => $key_suffix, 'post_status' => 'publish', 'post_type' => 'oembed_cache', ); if ( $html ) { if ( $cached_post_id ) { wp_update_post( wp_slash( array( 'ID' => $cached_post_id, 'post_content' => $html, ) ) ); } else { wp_insert_post( wp_slash( array_merge( $insert_post_args, array( 'post_content' => $html, ) ) ) ); } } elseif ( ! $cache ) { wp_insert_post( wp_slash( array_merge( $insert_post_args, array( 'post_content' => '{{unknown}}', ) ) ) ); } if ( $has_kses ) { kses_init_filters(); } } // If there was a result, return it. if ( $html ) { /** This filter is documented in wp-includes/class-wp-embed.php */ return apply_filters( 'embed_oembed_html', $html, $url, $attr, $post_ID ); } // Still unknown return $this->maybe_make_link( $url ); } /** * Delete all oEmbed caches. Unused by core as of 4.0.0. * * @param int $post_ID Post ID to delete the caches for. */ public function delete_oembed_caches( $post_ID ) { $post_metas = get_post_custom_keys( $post_ID ); if ( empty($post_metas) ) return; foreach ( $post_metas as $post_meta_key ) { if ( '_oembed_' == substr( $post_meta_key, 0, 8 ) ) delete_post_meta( $post_ID, $post_meta_key ); } } /** * Triggers a caching of all oEmbed results. * * @param int $post_ID Post ID to do the caching for. */ public function cache_oembed( $post_ID ) { $post = get_post( $post_ID ); $post_types = get_post_types( array( 'show_ui' => true ) ); /** * Filters the array of post types to cache oEmbed results for. * * @since 2.9.0 * * @param array $post_types Array of post types to cache oEmbed results for. Defaults to post types with `show_ui` set to true. */ if ( empty( $post->ID ) || ! in_array( $post->post_type, apply_filters( 'embed_cache_oembed_types', $post_types ) ) ){ return; } // Trigger a caching if ( ! empty( $post->post_content ) ) { $this->post_ID = $post->ID; $this->usecache = false; $content = $this->run_shortcode( $post->post_content ); $this->autoembed( $content ); $this->usecache = true; } } /** * Passes any unlinked URLs that are on their own line to WP_Embed::shortcode() for potential embedding. * * @see WP_Embed::autoembed_callback() * * @param string $content The content to be searched. * @return string Potentially modified $content. */ public function autoembed( $content ) { // Replace line breaks from all HTML elements with placeholders. $content = wp_replace_in_html_tags( $content, array( "\n" => '<!-- wp-line-break -->' ) ); if ( preg_match( '#(^|\s|>)https?://#i', $content ) ) { // Find URLs on their own line. $content = preg_replace_callback( '|^(\s*)(https?://[^\s<>"]+)(\s*)$|im', array( $this, 'autoembed_callback' ), $content ); // Find URLs in their own paragraph. $content = preg_replace_callback( '|(<p(?: [^>]*)?>\s*)(https?://[^\s<>"]+)(\s*<\/p>)|i', array( $this, 'autoembed_callback' ), $content ); } // Put the line breaks back. return str_replace( '<!-- wp-line-break -->', "\n", $content ); } /** * Callback function for WP_Embed::autoembed(). * * @param array $match A regex match array. * @return string The embed HTML on success, otherwise the original URL. */ public function autoembed_callback( $match ) { $oldval = $this->linkifunknown; $this->linkifunknown = false; $return = $this->shortcode( array(), $match[2] ); $this->linkifunknown = $oldval; return $match[1] . $return . $match[3]; } /** * Conditionally makes a hyperlink based on an internal class variable. * * @param string $url URL to potentially be linked. * @return false|string Linked URL or the original URL. False if 'return_false_on_fail' is true. */ public function maybe_make_link( $url ) { if ( $this->return_false_on_fail ) { return false; } $output = ( $this->linkifunknown ) ? '<a href="' . esc_url($url) . '">' . esc_html($url) . '</a>' : $url; /** * Filters the returned, maybe-linked embed URL. * * @since 2.9.0 * * @param string $output The linked or original URL. * @param string $url The original URL. */ return apply_filters( 'embed_maybe_make_link', $output, $url ); } /** * Find the oEmbed cache post ID for a given cache key. * * @since 4.9.0 * * @param string $cache_key oEmbed cache key. * @return int|null Post ID on success, null on failure. */ public function find_oembed_post_id( $cache_key ) { $cache_group = 'oembed_cache_post'; $oembed_post_id = wp_cache_get( $cache_key, $cache_group ); if ( $oembed_post_id && 'oembed_cache' === get_post_type( $oembed_post_id ) ) { return $oembed_post_id; } $oembed_post_query = new WP_Query( array( 'post_type' => 'oembed_cache', 'post_status' => 'publish', 'name' => $cache_key, 'posts_per_page' => 1, 'no_found_rows' => true, 'cache_results' => true, 'update_post_meta_cache' => false, 'update_post_term_cache' => false, 'lazy_load_term_meta' => false, ) ); if ( ! empty( $oembed_post_query->posts ) ) { // Note: 'fields'=>'ids' is not being used in order to cache the post object as it will be needed. $oembed_post_id = $oembed_post_query->posts[0]->ID; wp_cache_set( $cache_key, $oembed_post_id, $cache_group ); return $oembed_post_id; } return null; } } 
