/wp-includes/class-oembed.php
PHP | 295 lines | 149 code | 39 blank | 107 comment | 35 complexity | 978a3a75f24ade91344be2ae3d912079 MD5 | raw file
Possible License(s): AGPL-1.0, GPL-2.0, LGPL-2.1, GPL-3.0, LGPL-2.0, AGPL-3.0
- <?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();
-
- /**
- * Constructor
- *
- * @uses apply_filters() Filters a list of pre-defined oEmbed providers.
- */
- function __construct() {
- // List out some popular sites that support oEmbed.
- // The WP_Embed class disables discovery for non-unfiltered_html users, so only providers in this array will be used for them.
- // Add to this list using the wp_oembed_add_provider() function (see it's PHPDoc for details).
- $this->providers = apply_filters( 'oembed_providers', array(
- '#http://(www\.)?youtube.com/watch.*#i' => array( 'http://www.youtube.com/oembed', true ),
- 'http://youtu.be/*' => array( 'http://www.youtube.com/oembed', false ),
- 'http://blip.tv/*' => array( 'http://blip.tv/oembed/', false ),
- '#http://(www\.)?vimeo\.com/.*#i' => array( 'http://www.vimeo.com/api/oembed.{format}', true ),
- '#http://(www\.)?dailymotion\.com/.*#i' => array( 'http://www.dailymotion.com/api/oembed', true ),
- '#http://(www\.)?flickr\.com/.*#i' => array( 'http://www.flickr.com/services/oembed/', true ),
- '#http://(.+)?smugmug\.com/.*#i' => array( 'http://api.smugmug.com/services/oembed/', true ),
- '#http://(www\.)?hulu\.com/watch/.*#i' => array( 'http://www.hulu.com/api/oembed.{format}', true ),
- '#http://(www\.)?viddler\.com/.*#i' => array( 'http://lab.viddler.com/services/oembed/', true ),
- 'http://qik.com/*' => array( 'http://qik.com/api/oembed.{format}', false ),
- 'http://revision3.com/*' => array( 'http://revision3.com/api/oembed/', false ),
- 'http://i*.photobucket.com/albums/*' => array( 'http://photobucket.com/oembed', false ),
- 'http://gi*.photobucket.com/groups/*' => array( 'http://photobucket.com/oembed', false ),
- '#http://(www\.)?scribd\.com/.*#i' => array( 'http://www.scribd.com/services/oembed', true ),
- 'http://wordpress.tv/*' => array( 'http://wordpress.tv/oembed/', false ),
- '#http://(answers|surveys)\.polldaddy.com/.*#i' => array( 'http://polldaddy.com/oembed/', true ),
- '#http://(www\.)?funnyordie\.com/videos/.*#i' => array( 'http://www.funnyordie.com/oembed', true ),
- ) );
-
- // Fix any embeds that contain new lines in the middle of the HTML which breaks wpautop().
- add_filter( 'oembed_dataparse', array(&$this, '_strip_newlines'), 10, 3 );
- }
-
- /**
- * 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 => $data ) {
- list( $providerurl, $regex ) = $data;
-
- // Turn the asterisk-type provider URLs into regex
- if ( !$regex )
- $matchmask = '#' . str_replace( '___wildcard___', '(.+)', preg_quote( str_replace( '*', '___wildcard___', $matchmask ), '#' ) ) . '#i';
-
- if ( preg_match( $matchmask, $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_result', $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( 'maxwidth', (int) $args['width'], $provider );
- $provider = add_query_arg( 'maxheight', (int) $args['height'], $provider );
- $provider = add_query_arg( 'url', urlencode($url), $provider );
-
- foreach( array( 'json', 'xml' ) as $format ) {
- $result = $this->_fetch_with_format( $provider, $format );
- if ( is_wp_error( $result ) && 'not-implemented' == $result->get_error_code() )
- continue;
- return ( $result && ! is_wp_error( $result ) ) ? $result : false;
- }
- return false;
- }
-
- /**
- * Fetches result from an oEmbed provider for a specific format and complete provider URL
- *
- * @since 3.0.0
- * @access private
- * @param string $provider_url_with_args URL to the provider with full arguments list (url, maxheight, etc.)
- * @param string $format Format to use
- * @return bool|object False on failure, otherwise the result in the form of an object.
- */
- function _fetch_with_format( $provider_url_with_args, $format ) {
- $provider_url_with_args = add_query_arg( 'format', $format, $provider_url_with_args );
- $response = wp_remote_get( $provider_url_with_args );
- if ( 501 == wp_remote_retrieve_response_code( $response ) )
- return new WP_Error( 'not-implemented' );
- if ( ! $body = wp_remote_retrieve_body( $response ) )
- return false;
- $parse_method = "_parse_$format";
- return $this->$parse_method( $body );
- }
-
- /**
- * Parses a json response body.
- *
- * @since 3.0.0
- * @access private
- */
- function _parse_json( $response_body ) {
- return ( ( $data = json_decode( trim( $response_body ) ) ) && is_object( $data ) ) ? $data : false;
- }
-
- /**
- * Parses an XML response body.
- *
- * @since 3.0.0
- * @access private
- */
- function _parse_xml( $response_body ) {
- if ( function_exists('simplexml_load_string') ) {
- $errors = libxml_use_internal_errors( 'true' );
- $data = simplexml_load_string( $response_body );
- 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 = '<a href="' . esc_url( $url ) . '"><img src="' . esc_url( $data->url ) . '" alt="' . esc_attr($title) . '" width="' . esc_attr($data->width) . '" height="' . esc_attr($data->height) . '" /></a>';
- break;
-
- case 'video':
- case 'rich':
- $return = ( !empty($data->html) ) ? $data->html : false;
- break;
-
- case 'link':
- $return = ( !empty($data->title) ) ? '<a href="' . esc_url($url) . '">' . esc_html($data->title) . '</a>' : false;
- break;
-
- default;
- $return = false;
- }
-
- // You can use this filter to add support for custom data types or to filter the result
- return apply_filters( 'oembed_dataparse', $return, $data, $url );
- }
-
- /**
- * Strip any new lines from the HTML.
- *
- * @access private
- * @param string $html Existing HTML.
- * @param object $data Data object from WP_oEmbed::data2html()
- * @param string $url The original URL passed to oEmbed.
- * @return string Possibly modified $html
- */
- function _strip_newlines( $html, $data, $url ) {
- if ( false !== strpos( $html, "\n" ) )
- $html = str_replace( array( "\r\n", "\n" ), '', $html );
-
- return $html;
- }
- }
-
- /**
- * 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;
- }
-
- ?>