mirror of
https://github.com/WordPress/WordPress.git
synced 2024-12-25 02:27:50 +01:00
18f11f1fbc
git-svn-id: http://svn.automattic.com/wordpress/trunk@12027 1a063a9b-81f0-0310-95a4-ce76da25c4cd
239 lines
7.3 KiB
PHP
239 lines
7.3 KiB
PHP
<?php
|
|
/**
|
|
* API for fetching the HTML to embed remote content based on a provided URL.
|
|
* Used internally by the {@link WP_Embed} class, but is designed to be generic.
|
|
*
|
|
* @link http://codex.wordpress.org/oEmbed oEmbed Codex Article
|
|
* @link http://oembed.com/ oEmbed Homepage
|
|
*
|
|
* @package WordPress
|
|
* @subpackage oEmbed
|
|
*/
|
|
|
|
/**
|
|
* oEmbed class.
|
|
*
|
|
* @package WordPress
|
|
* @subpackage oEmbed
|
|
* @since 2.9.0
|
|
*/
|
|
class WP_oEmbed {
|
|
var $providers = array();
|
|
|
|
/**
|
|
* PHP4 constructor
|
|
*/
|
|
function WP_oEmbed() {
|
|
return $this->__construct();
|
|
}
|
|
|
|
/**
|
|
* PHP5 constructor
|
|
*
|
|
* @uses apply_filters() Filters a list of pre-defined oEmbed providers.
|
|
*/
|
|
function __construct() {
|
|
// List out some popular sites, mainly ones that don't have discovery tags in their <head>
|
|
// The WP_Embed class disables discovery for non-unfiltered_html users,
|
|
// so only providers in this array will be used for them.
|
|
$this->providers = apply_filters( 'oembed_providers', array(
|
|
'http://*.youtube.com/watch*' => 'http://www.youtube.com/oembed',
|
|
'http://youtube.com/watch*' => 'http://www.youtube.com/oembed',
|
|
'http://blip.tv/file/*' => 'http://blip.tv/oembed/',
|
|
'http://*.flickr.com/*' => 'http://www.flickr.com/services/oembed/',
|
|
'http://www.hulu.com/watch/*' => 'http://www.hulu.com/api/oembed.{format}',
|
|
'http://*.viddler.com/*' => 'http://lab.viddler.com/services/oembed/',
|
|
'http://qik.com/*' => 'http://qik.com/api/oembed.{format}',
|
|
'http://*.revision3.com/*' => 'http://revision3.com/api/oembed/',
|
|
|
|
// Vimeo uses the discovery <link>, so leave this commented to use it as a discovery test
|
|
//'http://www.vimeo.com/*' => 'http://www.vimeo.com/api/oembed.{format}',
|
|
) );
|
|
}
|
|
|
|
/**
|
|
* The do-it-all function that takes a URL and attempts to return the HTML.
|
|
*
|
|
* @see WP_oEmbed::discover()
|
|
* @see WP_oEmbed::fetch()
|
|
* @see WP_oEmbed::data2html()
|
|
*
|
|
* @param string $url The URL to the content that should be attempted to be embedded.
|
|
* @param array $args Optional arguments. Usually passed from a shortcode.
|
|
* @return bool|string False on failure, otherwise the UNSANITIZED (and potentially unsafe) HTML that should be used to embed.
|
|
*/
|
|
function get_html( $url, $args = '' ) {
|
|
$provider = false;
|
|
|
|
if ( !isset($args['discover']) )
|
|
$args['discover'] = true;
|
|
|
|
foreach ( $this->providers as $matchmask => $providerurl ) {
|
|
// Turn the asterisk-type provider URLs into regex
|
|
$regex = '#' . str_replace( '___wildcard___', '(.+)', preg_quote( str_replace( '*', '___wildcard___', $matchmask ), '#' ) ) . '#i';
|
|
|
|
if ( preg_match( $regex, $url ) ) {
|
|
$provider = str_replace( '{format}', 'json', $providerurl ); // JSON is easier to deal with than XML
|
|
break;
|
|
}
|
|
}
|
|
|
|
if ( !$provider && $args['discover'] )
|
|
$provider = $this->discover( $url );
|
|
|
|
if ( !$provider || false === $data = $this->fetch( $provider, $url, $args ) )
|
|
return false;
|
|
|
|
return apply_filters( 'oembed_output', $this->data2html( $data, $url ), $url, $args );
|
|
}
|
|
|
|
/**
|
|
* Attempts to find oEmbed provider discovery <link> tags at the given URL.
|
|
*
|
|
* @param string $url The URL that should be inspected for discovery <link> tags.
|
|
* @return bool|string False on failure, otherwise the oEmbed provider URL.
|
|
*/
|
|
function discover( $url ) {
|
|
$providers = array();
|
|
|
|
// Fetch URL content
|
|
if ( $html = wp_remote_retrieve_body( wp_remote_get( $url ) ) ) {
|
|
|
|
// <link> types that contain oEmbed provider URLs
|
|
$linktypes = apply_filters( 'oembed_linktypes', array(
|
|
'application/json+oembed' => 'json',
|
|
'text/xml+oembed' => 'xml',
|
|
'application/xml+oembed' => 'xml', // Incorrect, but used by at least Vimeo
|
|
) );
|
|
|
|
// Strip <body>
|
|
$html = substr( $html, 0, stripos( $html, '</head>' ) );
|
|
|
|
// Do a quick check
|
|
$tagfound = false;
|
|
foreach ( $linktypes as $linktype => $format ) {
|
|
if ( stripos($html, $linktype) ) {
|
|
$tagfound = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if ( $tagfound && preg_match_all( '/<link([^<>]+)>/i', $html, $links ) ) {
|
|
foreach ( $links[1] as $link ) {
|
|
$atts = shortcode_parse_atts( $link );
|
|
|
|
if ( !empty($atts['type']) && !empty($linktypes[$atts['type']]) && !empty($atts['href']) ) {
|
|
$providers[$linktypes[$atts['type']]] = $atts['href'];
|
|
|
|
// Stop here if it's JSON (that's all we need)
|
|
if ( 'json' == $linktypes[$atts['type']] )
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// JSON is preferred to XML
|
|
if ( !empty($providers['json']) )
|
|
return $providers['json'];
|
|
elseif ( !empty($providers['xml']) )
|
|
return $providers['xml'];
|
|
else
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Connects to a oEmbed provider and returns the result.
|
|
*
|
|
* @param string $provider The URL to the oEmbed provider.
|
|
* @param string $url The URL to the content that is desired to be embedded.
|
|
* @param array $args Optional arguments. Usually passed from a shortcode.
|
|
* @return bool|object False on failure, otherwise the result in the form of an object.
|
|
*/
|
|
function fetch( $provider, $url, $args = '' ) {
|
|
$args = wp_parse_args( $args, wp_embed_defaults() );
|
|
|
|
$provider = add_query_arg( 'format', 'json', $provider ); // JSON is easier to deal with than XML
|
|
|
|
$provider = add_query_arg( 'maxwidth', $args['width'], $provider );
|
|
$provider = add_query_arg( 'maxheight', $args['height'], $provider );
|
|
$provider = add_query_arg( 'url', urlencode($url), $provider );
|
|
|
|
if ( !$result = wp_remote_retrieve_body( wp_remote_get( $provider ) ) )
|
|
return false;
|
|
|
|
$result = trim( $result );
|
|
|
|
// JSON?
|
|
// Example content: http://vimeo.com/api/oembed.json?url=http%3A%2F%2Fvimeo.com%2F240975
|
|
if ( $data = json_decode($result) ) {
|
|
return $data;
|
|
}
|
|
|
|
// Must be XML. Only parse it if PHP5 is installed. (PHP4 isn't worth the trouble.)
|
|
// Example content: http://vimeo.com/api/oembed.xml?url=http%3A%2F%2Fvimeo.com%2F240975
|
|
elseif ( function_exists('simplexml_load_string') ) {
|
|
$errors = libxml_use_internal_errors( 'true' );
|
|
|
|
$data = simplexml_load_string( $result );
|
|
|
|
libxml_use_internal_errors( $errors );
|
|
|
|
if ( is_object($data) )
|
|
return $data;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Converts a data object from {@link WP_oEmbed::fetch()} and returns the HTML.
|
|
*
|
|
* @param object $data A data object result from an oEmbed provider.
|
|
* @param string $url The URL to the content that is desired to be embedded.
|
|
* @return bool|string False on error, otherwise the HTML needed to embed.
|
|
*/
|
|
function data2html( $data, $url ) {
|
|
if ( !is_object($data) || empty($data->type) )
|
|
return false;
|
|
|
|
switch ( $data->type ) {
|
|
case 'photo':
|
|
if ( empty($data->url) || empty($data->width) || empty($data->height) )
|
|
return false;
|
|
|
|
$title = ( !empty($data->title) ) ? $data->title : '';
|
|
return '<img src="' . esc_attr( clean_url( $data->url ) ) . '" alt="' . esc_attr($title) . '" width="' . esc_attr($data->width) . '" height="' . esc_attr($data->height) . '" />';
|
|
|
|
case 'video':
|
|
case 'rich':
|
|
return ( !empty($data->html) ) ? $data->html : false;
|
|
|
|
case 'link':
|
|
return ( !empty($data->title) ) ? '<a href="' . clean_url($url) . '">' . esc_html($data->title) . '</a>' : false;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns the initialized {@link WP_oEmbed} object
|
|
*
|
|
* @since 2.9.0
|
|
* @access private
|
|
*
|
|
* @see WP_oEmbed
|
|
* @uses WP_oEmbed
|
|
*
|
|
* @return WP_oEmbed object.
|
|
*/
|
|
function &_wp_oembed_get_object() {
|
|
static $wp_oembed;
|
|
|
|
if ( is_null($wp_oembed) )
|
|
$wp_oembed = new WP_oEmbed();
|
|
|
|
return $wp_oembed;
|
|
}
|