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; if ( ! empty( $this->post_ID ) ) // Potentially set by WP_Embed::cache_oembed() $post_ID = $this->post_ID; // Unknown URL format. Let oEmbed have a go. if ( $post_ID ) { // Check for a cached result (stored 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 = get_post_meta( $post_ID, $cachekey, true ); $cache_time = get_post_meta( $post_ID, $cachekey_time, true ); if ( ! $cache_time ) { $cache_time = 0; } $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 `` tag discovery. Default true. */ $attr['discover'] = ( apply_filters( 'embed_oembed_discover', true ) ); // Use oEmbed to get the HTML $html = wp_oembed_get( $url, $attr ); // Maybe cache the result 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}}' ); } // 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" => '' ) ); 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( '|(]*)?>\s*)(https?://[^\s<>"]+)(\s*<\/p>)|i', array( $this, 'autoembed_callback' ), $content ); } // Put the line breaks back. return str_replace( '', "\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 = ( $this->linkifunknown ) ? '' . esc_html($url) . '' : $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 ); } } $GLOBALS['wp_embed'] = new WP_Embed();