2009-10-13 13:04:22 -04:00
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<?php
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/**
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* API for fetching the HTML to embed remote content based on a provided URL.
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* Used internally by the {@link WP_Embed} class, but is designed to be generic.
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*
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* @link http://codex.wordpress.org/oEmbed oEmbed Codex Article
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* @link http://oembed.com/ oEmbed Homepage
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*
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* @package WordPress
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* @subpackage oEmbed
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*/
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/**
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* oEmbed class.
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*
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* @package WordPress
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* @subpackage oEmbed
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* @since 2.9.0
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*/
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class WP_oEmbed {
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var $providers = array();
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/**
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* PHP4 constructor
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*/
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function WP_oEmbed() {
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return $this->__construct();
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}
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/**
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* PHP5 constructor
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*
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* @uses apply_filters() Filters a list of pre-defined oEmbed providers.
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*/
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function __construct() {
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// List out some popular sites, mainly ones that don't have discovery tags in their <head>
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// The WP_Embed class disables discovery for non-unfiltered_html users,
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// so only providers in this array will be used for them.
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$this->providers = apply_filters( 'oembed_providers', array(
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2009-10-13 18:36:24 -04:00
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'http://*.youtube.com/watch*' => 'http://www.youtube.com/oembed',
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'http://youtube.com/watch*' => 'http://www.youtube.com/oembed',
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2009-10-13 13:04:22 -04:00
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'http://blip.tv/file/*' => 'http://blip.tv/oembed/',
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'http://*.flickr.com/*' => 'http://www.flickr.com/services/oembed/',
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2009-10-13 18:36:24 -04:00
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'http://www.hulu.com/watch/*' => 'http://www.hulu.com/api/oembed.{format}',
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2009-10-13 13:04:22 -04:00
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'http://*.viddler.com/*' => 'http://lab.viddler.com/services/oembed/',
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'http://qik.com/*' => 'http://qik.com/api/oembed.{format}',
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'http://*.revision3.com/*' => 'http://revision3.com/api/oembed/',
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// Vimeo uses the discovery <link>, so leave this commented to use it as a discovery test
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//'http://www.vimeo.com/*' => 'http://www.vimeo.com/api/oembed.{format}',
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) );
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}
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/**
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* The do-it-all function that takes a URL and attempts to return the HTML.
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*
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* @see WP_oEmbed::discover()
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* @see WP_oEmbed::fetch()
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* @see WP_oEmbed::data2html()
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*
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* @param string $url The URL to the content that should be attempted to be embedded.
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* @param array $args Optional arguments. Usually passed from a shortcode.
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* @return bool|string False on failure, otherwise the UNSANITIZED (and potentially unsafe) HTML that should be used to embed.
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*/
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function get_html( $url, $args = '' ) {
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$provider = false;
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if ( !isset($args['discover']) )
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$args['discover'] = true;
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foreach ( $this->providers as $matchmask => $providerurl ) {
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// Turn the asterisk-type provider URLs into regex
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$regex = '#' . str_replace( '___wildcard___', '(.+)', preg_quote( str_replace( '*', '___wildcard___', $matchmask ), '#' ) ) . '#i';
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if ( preg_match( $regex, $url ) ) {
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$provider = str_replace( '{format}', 'json', $providerurl ); // JSON is easier to deal with than XML
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break;
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}
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}
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if ( !$provider && $args['discover'] )
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$provider = $this->discover( $url );
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if ( !$provider || false === $data = $this->fetch( $provider, $url, $args ) )
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return false;
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return apply_filters( 'oembed_output', $this->data2html( $data, $url ), $url, $args );
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}
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/**
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* Attempts to find oEmbed provider discovery <link> tags at the given URL.
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*
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* @param string $url The URL that should be inspected for discovery <link> tags.
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* @return bool|string False on failure, otherwise the oEmbed provider URL.
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*/
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function discover( $url ) {
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$providers = array();
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// Fetch URL content
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if ( $html = wp_remote_retrieve_body( wp_remote_get( $url ) ) ) {
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// <link> types that contain oEmbed provider URLs
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$linktypes = apply_filters( 'oembed_linktypes', array(
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'application/json+oembed' => 'json',
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'text/xml+oembed' => 'xml',
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'application/xml+oembed' => 'xml', // Incorrect, but used by at least Vimeo
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) );
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// Strip <body>
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$html = substr( $html, 0, stripos( $html, '</head>' ) );
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// Do a quick check
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$tagfound = false;
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foreach ( $linktypes as $linktype => $format ) {
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if ( stripos($html, $linktype) ) {
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$tagfound = true;
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break;
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}
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}
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if ( $tagfound && preg_match_all( '/<link([^<>]+)>/i', $html, $links ) ) {
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foreach ( $links[1] as $link ) {
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$atts = shortcode_parse_atts( $link );
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if ( !empty($atts['type']) && !empty($linktypes[$atts['type']]) && !empty($atts['href']) ) {
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$providers[$linktypes[$atts['type']]] = $atts['href'];
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// Stop here if it's JSON (that's all we need)
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if ( 'json' == $linktypes[$atts['type']] )
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break;
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}
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}
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}
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}
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// JSON is preferred to XML
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if ( !empty($providers['json']) )
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return $providers['json'];
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elseif ( !empty($providers['xml']) )
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return $providers['xml'];
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else
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return false;
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}
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/**
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* Connects to a oEmbed provider and returns the result.
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*
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* @param string $provider The URL to the oEmbed provider.
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* @param string $url The URL to the content that is desired to be embedded.
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* @param array $args Optional arguments. Usually passed from a shortcode.
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* @return bool|object False on failure, otherwise the result in the form of an object.
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*/
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function fetch( $provider, $url, $args = '' ) {
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$args = wp_parse_args( $args, wp_embed_defaults() );
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$provider = add_query_arg( 'format', 'json', $provider ); // JSON is easier to deal with than XML
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$provider = add_query_arg( 'maxwidth', $args['width'], $provider );
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$provider = add_query_arg( 'maxheight', $args['height'], $provider );
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$provider = add_query_arg( 'url', urlencode($url), $provider );
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if ( !$result = wp_remote_retrieve_body( wp_remote_get( $provider ) ) )
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return false;
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$result = trim( $result );
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// JSON?
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// Example content: http://vimeo.com/api/oembed.json?url=http%3A%2F%2Fvimeo.com%2F240975
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if ( $data = json_decode($result) ) {
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return $data;
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}
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// Must be XML. Only parse it if PHP5 is installed. (PHP4 isn't worth the trouble.)
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// Example content: http://vimeo.com/api/oembed.xml?url=http%3A%2F%2Fvimeo.com%2F240975
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elseif ( function_exists('simplexml_load_string') ) {
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$errors = libxml_use_internal_errors( 'true' );
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$data = simplexml_load_string( $result );
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libxml_use_internal_errors( $errors );
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if ( is_object($data) )
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return $data;
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}
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return false;
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}
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/**
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* Converts a data object from {@link WP_oEmbed::fetch()} and returns the HTML.
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*
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* @param object $data A data object result from an oEmbed provider.
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* @param string $url The URL to the content that is desired to be embedded.
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* @return bool|string False on error, otherwise the HTML needed to embed.
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*/
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function data2html( $data, $url ) {
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if ( !is_object($data) || empty($data->type) )
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return false;
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switch ( $data->type ) {
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case 'photo':
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if ( empty($data->url) || empty($data->width) || empty($data->height) )
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return false;
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$title = ( !empty($data->title) ) ? $data->title : '';
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return '<img src="' . esc_attr( clean_url( $data->url ) ) . '" alt="' . esc_attr($title) . '" width="' . esc_attr($data->width) . '" height="' . esc_attr($data->height) . '" />';
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case 'video':
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case 'rich':
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return ( !empty($data->html) ) ? $data->html : false;
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case 'link':
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return ( !empty($data->title) ) ? '<a href="' . clean_url($url) . '">' . esc_html($data->title) . '</a>' : false;
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}
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return false;
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}
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}
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/**
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* Returns the initialized {@link WP_oEmbed} object
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*
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* @since 2.9.0
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* @access private
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*
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* @see WP_oEmbed
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* @uses WP_oEmbed
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*
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* @return WP_oEmbed object.
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*/
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function &_wp_oembed_get_object() {
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static $wp_oembed;
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if ( is_null($wp_oembed) )
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$wp_oembed = new WP_oEmbed();
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return $wp_oembed;
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}
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