--- /dev/null
+<?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 {
+ var $handlers = array();
+ var $post_ID;
+ var $usecache = true;
+ var $linkifunknown = true;
+
+ /**
+ * Constructor
+ */
+ function __construct() {
+ // Hack to get the [embed] shortcode to run before wpautop()
+ add_filter( 'the_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 );
+
+ // When a post is saved, invalidate the oEmbed cache
+ add_action( 'pre_post_update', array( $this, 'delete_oembed_caches' ) );
+
+ // After a post is saved, cache oEmbed items via AJAX
+ add_action( 'edit_form_advanced', 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 {@link do_shortcode()}, and then re-registers the old shortcodes.
+ *
+ * @uses $shortcode_tags
+ * @uses remove_all_shortcodes()
+ * @uses add_shortcode()
+ * @uses do_shortcode()
+ *
+ * @param string $content Content to parse
+ * @return string Content with shortcode parsed
+ */
+ 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 );
+
+ // 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().
+ */
+ function maybe_run_ajax_cache() {
+ $post = get_post();
+
+ if ( ! $post || empty($_GET['message']) || 1 != $_GET['message'] )
+ return;
+
+?>
+<script type="text/javascript">
+/* <![CDATA[ */
+ jQuery(document).ready(function($){
+ $.get("<?php echo admin_url( 'admin-ajax.php?action=oembed-cache&post=' . $post->ID, 'relative' ); ?>");
+ });
+/* ]]> */
+</script>
+<?php
+ }
+
+ /**
+ * Register an embed handler. Do not use this function directly, use {@link 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 callback $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.
+ */
+ function register_handler( $id, $regex, $callback, $priority = 10 ) {
+ $this->handlers[$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 = ( $this->linkifunknown ) ? '<a href="' . esc_attr($url) . '">' . esc_html($url) . '</a>' : $url;
+ return apply_filters( 'embed_maybe_make_link', $output, $url );
+ }
+}
+$GLOBALS['wp_embed'] = new WP_Embed();
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