handlers[$priority][$id] = array( 'regex' => $regex, 'callback' => $callback, ); } /** * Unregister a previously registered embed handler. Do not use this function directly, use {@link 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). */ function unregister_handler( $id, $priority = 10 ) { if ( isset($this->handlers[$priority][$id]) ) unset($this->handlers[$priority][$id]); } /** * The {@link 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 {@link WP_oEmbed} class. * * @uses wp_oembed_get() * @uses wp_parse_args() * @uses wp_embed_defaults() * @uses WP_Embed::maybe_make_link() * @uses get_option() * @uses author_can() * @uses wp_cache_get() * @uses wp_cache_set() * @uses get_post_meta() * @uses update_post_meta() * * @param array $attr Shortcode attributes. * @param string $url The URL attempting to be embedded. * @return string The embed HTML on success, otherwise the original URL. */ function shortcode( $attr, $url = '' ) { $post = get_post(); if ( empty( $url ) ) return ''; $rawattr = $attr; $attr = wp_parse_args( $attr, wp_embed_defaults() ); // kses converts & into & and we need to undo this // See http://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 ) ) 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) $cachekey = '_oembed_' . md5( $url . serialize( $attr ) ); if ( $this->usecache ) { $cache = get_post_meta( $post_ID, $cachekey, true ); // Failures are cached if ( '{{unknown}}' === $cache ) return $this->maybe_make_link( $url ); if ( ! empty( $cache ) ) return apply_filters( 'embed_oembed_html', $cache, $url, $attr, $post_ID ); } // Use oEmbed to get the HTML $attr['discover'] = ( apply_filters('embed_oembed_discover', false) && author_can( $post_ID, 'unfiltered_html' ) ); $html = wp_oembed_get( $url, $attr ); // Cache the result $cache = ( $html ) ? $html : '{{unknown}}'; update_post_meta( $post_ID, $cachekey, $cache ); // If there was a result, return it if ( $html ) return apply_filters( 'embed_oembed_html', $html, $url, $attr, $post_ID ); } // Still unknown return $this->maybe_make_link( $url ); } /** * Delete all oEmbed caches. * * @param int $post_ID Post ID to delete the caches for. */ 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. */ function cache_oembed( $post_ID ) { $post = get_post( $post_ID ); if ( empty($post->ID) || !in_array( $post->post_type, apply_filters( 'embed_cache_oembed_types', array( 'post', 'page' ) ) ) ) return; // Trigger a caching if ( !empty($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 {@link WP_Embed::shortcode()} for potential embedding. * * @uses WP_Embed::autoembed_callback() * * @param string $content The content to be searched. * @return string Potentially modified $content. */ function autoembed( $content ) { return preg_replace_callback( '|^\s*(https?://[^\s"]+)\s*$|im', array( $this, 'autoembed_callback' ), $content ); } /** * Callback function for {@link WP_Embed::autoembed()}. * * @uses WP_Embed::shortcode() * * @param array $match A regex match array. * @return string The embed HTML on success, otherwise the original URL. */ function autoembed_callback( $match ) { $oldval = $this->linkifunknown; $this->linkifunknown = false; $return = $this->shortcode( array(), $match[1] ); $this->linkifunknown = $oldval; return "\n$return\n"; } /** * Conditionally makes a hyperlink based on an internal class variable. * * @param string $url URL to potentially be linked. * @return string Linked URL or the original URL. */ function maybe_make_link( $url ) { $output = ( $this->linkifunknown ) ? '' . esc_html($url) . '' : $url; return apply_filters( 'embed_maybe_make_link', $output, $url ); } } $GLOBALS['wp_embed'] = new WP_Embed();