Web.Admin/2014/wordpress/wp-includes/class-wp-embed.php
<?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. 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 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 ) )
/**
* Filter 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)
$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 ) )
/**
* Filter 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 );
}
/**
* Filter whether to inspect the given URL for discoverable <link> tags.
*
* @since 2.9.0
*
* @see WP_oEmbed::discover()
*
* @param bool false Whether to enable <link> tag discovery. Default false.
*/
$attr['discover'] = ( apply_filters( 'embed_oembed_discover', false ) && author_can( $post_ID, 'unfiltered_html' ) );
// Use oEmbed to get the 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 ) {
/** 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.
*
* @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 );
$post_types = array( 'post', 'page' );
/**
* Filter the array of post types to cache oEmbed results for.
*
* @since 2.9.0
*
* @param array $post_types Array of post types to cache oEmbed results for. Default 'post', 'page'.
*/
if ( empty($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 {@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 = ( $this->linkifunknown ) ? '<a href="' . esc_url($url) . '">' . esc_html($url) . '</a>' : $url;
/**
* Filter 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();