wp-includes/class-oembed.php

   1 <?php
   2 /**
   3  * API for fetching the HTML to embed remote content based on a provided URL.
   4  * Used internally by the {@link WP_Embed} class, but is designed to be generic.
   5  *
   6  * @link http://codex.wordpress.org/oEmbed oEmbed Codex Article
   7  * @link http://oembed.com/ oEmbed Homepage
   8  *
   9  * @package WordPress
  10  * @subpackage oEmbed
  11  */
  12
  13 /**
  14  * oEmbed class.
  15  *
  16  * @package WordPress
  17  * @subpackage oEmbed
  18  * @since 2.9.0
  19  */
  20 class WP_oEmbed {
  21         public $providers = array();
  22         public static $early_providers = array();
  23
  24         /**
  25          * Constructor
  26          *
  27          * @since 2.9.0
  28          */
  29         public function __construct() {
  30                 $providers = array(
  31                         '#http://(www\.)?youtube\.com/watch.*#i'              => array( 'http://www.youtube.com/oembed',                      true  ),
  32                         '#https://(www\.)?youtube\.com/watch.*#i'             => array( 'http://www.youtube.com/oembed?scheme=https',         true  ),
  33                         '#http://(www\.)?youtube\.com/playlist.*#i'           => array( 'http://www.youtube.com/oembed',                      true  ),
  34                         '#https://(www\.)?youtube\.com/playlist.*#i'          => array( 'http://www.youtube.com/oembed?scheme=https',         true  ),
  35                         '#http://youtu\.be/.*#i'                              => array( 'http://www.youtube.com/oembed',                      true  ),
  36                         '#https://youtu\.be/.*#i'                             => array( 'http://www.youtube.com/oembed?scheme=https',         true  ),
  37                         'http://blip.tv/*'                                    => array( 'http://blip.tv/oembed/',                             false ),
  38                         '#https?://(.+\.)?vimeo\.com/.*#i'                    => array( 'http://vimeo.com/api/oembed.{format}',               true  ),
  39                         '#https?://(www\.)?dailymotion\.com/.*#i'             => array( 'http://www.dailymotion.com/services/oembed',         true  ),
  40                         'http://dai.ly/*'                                     => array( 'http://www.dailymotion.com/services/oembed',         false ),
  41                         '#https?://(www\.)?flickr\.com/.*#i'                  => array( 'https://www.flickr.com/services/oembed/',            true  ),
  42                         '#https?://flic\.kr/.*#i'                             => array( 'https://www.flickr.com/services/oembed/',            true  ),
  43                         '#https?://(.+\.)?smugmug\.com/.*#i'                  => array( 'http://api.smugmug.com/services/oembed/',            true  ),
  44                         '#https?://(www\.)?hulu\.com/watch/.*#i'              => array( 'http://www.hulu.com/api/oembed.{format}',            true  ),
  45                         'http://revision3.com/*'                              => array( 'http://revision3.com/api/oembed/',                   false ),
  46                         'http://i*.photobucket.com/albums/*'                  => array( 'http://photobucket.com/oembed',                      false ),
  47                         'http://gi*.photobucket.com/groups/*'                 => array( 'http://photobucket.com/oembed',                      false ),
  48                         '#https?://(www\.)?scribd\.com/doc/.*#i'              => array( 'http://www.scribd.com/services/oembed',              true  ),
  49                         '#https?://wordpress.tv/.*#i'                         => array( 'http://wordpress.tv/oembed/',                        true ),
  50                         '#https?://(.+\.)?polldaddy\.com/.*#i'                => array( 'https://polldaddy.com/oembed/',                      true  ),
  51                         '#https?://poll\.fm/.*#i'                             => array( 'https://polldaddy.com/oembed/',                      true  ),
  52                         '#https?://(www\.)?funnyordie\.com/videos/.*#i'       => array( 'http://www.funnyordie.com/oembed',                   true  ),
  53                         '#https?://(www\.)?twitter\.com/.+?/status(es)?/.*#i' => array( 'https://api.twitter.com/1/statuses/oembed.{format}', true  ),
  54                         '#https?://vine.co/v/.*#i'                            => array( 'https://vine.co/oembed.{format}',                    true  ),
  55                         '#https?://(www\.)?soundcloud\.com/.*#i'              => array( 'http://soundcloud.com/oembed',                       true  ),
  56                         '#https?://(.+?\.)?slideshare\.net/.*#i'              => array( 'https://www.slideshare.net/api/oembed/2',            true  ),
  57                         '#http://instagr(\.am|am\.com)/p/.*#i'                => array( 'http://api.instagram.com/oembed',                    true  ),
  58                         '#https?://(www\.)?rdio\.com/.*#i'                    => array( 'http://www.rdio.com/api/oembed/',                    true  ),
  59                         '#https?://rd\.io/x/.*#i'                             => array( 'http://www.rdio.com/api/oembed/',                    true  ),
  60                         '#https?://(open|play)\.spotify\.com/.*#i'            => array( 'https://embed.spotify.com/oembed/',                  true  ),
  61                         '#https?://(.+\.)?imgur\.com/.*#i'                    => array( 'http://api.imgur.com/oembed',                        true  ),
  62                         '#https?://(www\.)?meetu(\.ps|p\.com)/.*#i'           => array( 'http://api.meetup.com/oembed',                       true  ),
  63                         '#https?://(www\.)?issuu\.com/.+/docs/.+#i'           => array( 'http://issuu.com/oembed_wp',                         true  ),
  64                         '#https?://(www\.)?collegehumor\.com/video/.*#i'      => array( 'http://www.collegehumor.com/oembed.{format}',        true  ),
  65                         '#https?://(www\.)?mixcloud\.com/.*#i'                => array( 'http://www.mixcloud.com/oembed',                     true  ),
  66                         '#https?://(www\.|embed\.)?ted\.com/talks/.*#i'       => array( 'http://www.ted.com/talks/oembed.{format}',           true  ),
  67                         '#https?://(www\.)?(animoto|video214)\.com/play/.*#i' => array( 'http://animoto.com/oembeds/create',                  true  ),
  68                 );
  69
  70                 if ( ! empty( self::$early_providers['add'] ) ) {
  71                         foreach ( self::$early_providers['add'] as $format => $data ) {
  72                                 $providers[ $format ] = $data;
  73                         }
  74                 }
  75
  76                 if ( ! empty( self::$early_providers['remove'] ) ) {
  77                         foreach ( self::$early_providers['remove'] as $format ) {
  78                                 unset( $providers[ $format ] );
  79                         }
  80                 }
  81
  82                 self::$early_providers = array();
  83
  84                 /**
  85                  * Filter the list of oEmbed providers.
  86                  *
  87                  * Discovery is disabled for users lacking the unfiltered_html capability.
  88                  * Only providers in this array will be used for those users.
  89                  *
  90                  * Supported providers:
  91                  *
  92                  * | ------------ | -------------------- | ----- | --------- |
  93                  * |   Provider   |        Flavor        |  SSL  |   Since   |
  94                  * | ------------ | -------------------- | ----- | --------- |
  95                  * | Blip         | blip.tv              |       | 2.9.0     |
  96                  * | Dailymotion  | dailymotion.com      |  Yes  | 2.9.0     |
  97                  * | Flickr       | flickr.com           |  Yes  | 2.9.0     |
  98                  * | Hulu         | hulu.com             |  Yes  | 2.9.0     |
  99                  * | Photobucket  | photobucket.com      |       | 2.9.0     |
 100                  * | Revision3    | revision3.com        |       | 2.9.0     |
 101                  * | Scribd       | scribd.com           |  Yes  | 2.9.0     |
 102                  * | Vimeo        | vimeo.com            |  Yes  | 2.9.0     |
 103                  * | WordPress.tv | wordpress.tv         |  Yes  | 2.9.0     |
 104                  * | YouTube      | youtube.com/watch    |  Yes  | 2.9.0     |
 105                  * | ------------ | -------------------- | ----- | --------- |
 106                  * | Funny or Die | funnyordie.com       |  Yes  | 3.0.0     |
 107                  * | Polldaddy    | polldaddy.com        |  Yes  | 3.0.0     |
 108                  * | SmugMug      | smugmug.com          |  Yes  | 3.0.0     |
 109                  * | YouTube      | youtu.be             |  Yes  | 3.0.0     |
 110                  * | ------------ | -------------------- | ----- | --------- |
 111                  * | Twitter      | twitter.com          |  Yes  | 3.4.0     |
 112                  * | ------------ | -------------------- | ----- | --------- |
 113                  * | Instagram    | instagram.com        |       | 3.5.0     |
 114                  * | Instagram    | instagr.am           |       | 3.5.0     |
 115                  * | Slideshare   | slideshare.net       |  Yes  | 3.5.0     |
 116                  * | SoundCloud   | soundcloud.com       |  Yes  | 3.5.0     |
 117                  * | ------------ | -------------------- | ----- | --------- |
 118                  * | Dailymotion  | dai.ly               |       | 3.6.0     |
 119                  * | Flickr       | flic.kr              |  Yes  | 3.6.0     |
 120                  * | Rdio         | rdio.com             |  Yes  | 3.6.0     |
 121                  * | Rdio         | rd.io                |  Yes  | 3.6.0     |
 122                  * | Spotify      | spotify.com          |  Yes  | 3.6.0     |
 123                  * | ------------ | -------------------- | ----- | --------- |
 124                  * | Imgur        | imgur.com            |  Yes  | 3.9.0     |
 125                  * | Meetup.com   | meetup.com           |  Yes  | 3.9.0     |
 126                  * | Meetup.com   | meetu.ps             |  Yes  | 3.9.0     |
 127                  * | ------------ | -------------------- | ----- | --------- |
 128                  * | Animoto      | animoto.com          |  Yes  | 4.0.0     |
 129                  * | Animoto      | video214.com         |  Yes  | 4.0.0     |
 130                  * | CollegeHumor | collegehumor.com     |  Yes  | 4.0.0     |
 131                  * | Issuu        | issuu.com            |  Yes  | 4.0.0     |
 132                  * | Mixcloud     | mixcloud.com         |  Yes  | 4.0.0     |
 133                  * | Polldaddy    | poll.fm              |  Yes  | 4.0.0     |
 134                  * | TED          | ted.com              |  Yes  | 4.0.0     |
 135                  * | YouTube      | youtube.com/playlist |  Yes  | 4.0.0     |
 136                  * | ------------ | -------------------- | ----- | --------- |
 137                  * | Vine         | vine.co              |  Yes  | 4.1.0     |
 138                  * | ------------ | -------------------- | ----- | --------- |
 139                  *
 140                  * No longer supported providers:
 141                  *
 142                  * | ------------ | -------------------- | ----- | --------- | --------- |
 143                  * |   Provider   |        Flavor        |  SSL  |   Since   |  Removed  |
 144                  * | ------------ | -------------------- | ----- | --------- | --------- |
 145                  * | Qik          | qik.com              |  Yes  | 2.9.0     | 3.9.0     |
 146                  * | ------------ | -------------------- | ----- | --------- | --------- |
 147                  * | Viddler      | viddler.com          |  Yes  | 2.9.0     | 4.0.0     |
 148                  * | ------------ | -------------------- | ----- | --------- | --------- |
 149                  *
 150                  * @see wp_oembed_add_provider()
 151                  *
 152                  * @since 2.9.0
 153                  *
 154                  * @param array $providers An array of popular oEmbed providers.
 155                  */
 156                 $this->providers = apply_filters( 'oembed_providers', $providers );
 157
 158                 // Fix any embeds that contain new lines in the middle of the HTML which breaks wpautop().
 159                 add_filter( 'oembed_dataparse', array($this, '_strip_newlines'), 10, 3 );
 160         }
 161
 162         /**
 163          * Make private/protected methods readable for backwards compatibility.
 164          *
 165          * @since 4.0.0
 166          * @access public
 167          *
 168          * @param callable $name      Method to call.
 169          * @param array    $arguments Arguments to pass when calling.
 170          * @return mixed|bool Return value of the callback, false otherwise.
 171          */
 172         public function __call( $name, $arguments ) {
 173                 return call_user_func_array( array( $this, $name ), $arguments );
 174         }
 175
 176         /**
 177          * Takes a URL and returns the corresponding oEmbed provider's URL, if there is one.
 178          *
 179          * @since 4.0.0
 180          * @access public
 181          *
 182          * @see WP_oEmbed::discover()
 183          *
 184          * @param string        $url  The URL to the content.
 185          * @param string|array  $args Optional provider arguments.
 186          * @return bool|string False on failure, otherwise the oEmbed provider URL.
 187          */
 188         public function get_provider( $url, $args = '' ) {
 189
 190                 $provider = false;
 191
 192                 if ( !isset($args['discover']) )
 193                         $args['discover'] = true;
 194
 195                 foreach ( $this->providers as $matchmask => $data ) {
 196                         list( $providerurl, $regex ) = $data;
 197
 198                         // Turn the asterisk-type provider URLs into regex
 199                         if ( !$regex ) {
 200                                 $matchmask = '#' . str_replace( '___wildcard___', '(.+)', preg_quote( str_replace( '*', '___wildcard___', $matchmask ), '#' ) ) . '#i';
 201                                 $matchmask = preg_replace( '|^#http\\\://|', '#https?\://', $matchmask );
 202                         }
 203
 204                         if ( preg_match( $matchmask, $url ) ) {
 205                                 $provider = str_replace( '{format}', 'json', $providerurl ); // JSON is easier to deal with than XML
 206                                 break;
 207                         }
 208                 }
 209
 210                 if ( !$provider && $args['discover'] )
 211                         $provider = $this->discover( $url );
 212
 213                 return $provider;
 214         }
 215
 216         /**
 217          * Add an oEmbed provider just-in-time when wp_oembed_add_provider() is called
 218          * before the 'plugins_loaded' hook.
 219          *
 220          * The just-in-time addition is for the benefit of the 'oembed_providers' filter.
 221          *
 222          * @since 4.0.0
 223          * @access public
 224          * @static
 225          *
 226          * @see wp_oembed_add_provider()
 227          *
 228          * @param string $format   Format of URL that this provider can handle. You can use
 229          *                         asterisks as wildcards.
 230          * @param string $provider The URL to the oEmbed provider..
 231          * @param bool   $regex    Optional. Whether the $format parameter is in a regex format.
 232          *                         Default false.
 233          */
 234         public static function _add_provider_early( $format, $provider, $regex = false ) {
 235                 if ( empty( self::$early_providers['add'] ) ) {
 236                         self::$early_providers['add'] = array();
 237                 }
 238
 239                 self::$early_providers['add'][ $format ] = array( $provider, $regex );
 240         }
 241
 242         /**
 243          * Remove an oEmbed provider just-in-time when wp_oembed_remove_provider() is called
 244          * before the 'plugins_loaded' hook.
 245          *
 246          * The just-in-time removal is for the benefit of the 'oembed_providers' filter.
 247          *
 248          * @since 4.0.0
 249          * @access public
 250          * @static
 251          *
 252          * @see wp_oembed_remove_provider()
 253          *
 254          * @param string $format The format of URL that this provider can handle. You can use
 255          *                       asterisks as wildcards.
 256          */
 257         public static function _remove_provider_early( $format ) {
 258                 if ( empty( self::$early_providers['remove'] ) ) {
 259                         self::$early_providers['remove'] = array();
 260                 }
 261
 262                 self::$early_providers['remove'][] = $format;
 263         }
 264
 265         /**
 266          * The do-it-all function that takes a URL and attempts to return the HTML.
 267          *
 268          * @see WP_oEmbed::fetch()
 269          * @see WP_oEmbed::data2html()
 270          *
 271          * @param string $url The URL to the content that should be attempted to be embedded.
 272          * @param array $args Optional arguments. Usually passed from a shortcode.
 273          * @return false|string False on failure, otherwise the UNSANITIZED (and potentially unsafe) HTML that should be used to embed.
 274          */
 275         function get_html( $url, $args = '' ) {
 276                 $provider = $this->get_provider( $url, $args );
 277
 278                 if ( !$provider || false === $data = $this->fetch( $provider, $url, $args ) )
 279                         return false;
 280
 281                 /**
 282                  * Filter the HTML returned by the oEmbed provider.
 283                  *
 284                  * @since 2.9.0
 285                  *
 286                  * @param string $data The returned oEmbed HTML.
 287                  * @param string $url  URL of the content to be embedded.
 288                  * @param array  $args Optional arguments, usually passed from a shortcode.
 289                  */
 290                 return apply_filters( 'oembed_result', $this->data2html( $data, $url ), $url, $args );
 291         }
 292
 293         /**
 294          * Attempts to discover link tags at the given URL for an oEmbed provider.
 295          *
 296          * @param string $url The URL that should be inspected for discovery `<link>` tags.
 297          * @return bool|string False on failure, otherwise the oEmbed provider URL.
 298          */
 299         public function discover( $url ) {
 300                 $providers = array();
 301
 302                 /**
 303                  * Filter oEmbed remote get arguments.
 304                  *
 305                  * @since 4.0.0
 306                  *
 307                  * @see WP_Http::request()
 308                  *
 309                  * @param array  $args oEmbed remote get arguments.
 310                  * @param string $url  URL to be inspected.
 311                  */
 312                 $args = apply_filters( 'oembed_remote_get_args', array(), $url );
 313
 314                 // Fetch URL content
 315                 $request = wp_safe_remote_get( $url, $args );
 316                 if ( $html = wp_remote_retrieve_body( $request ) ) {
 317
 318                         /**
 319                          * Filter the link types that contain oEmbed provider URLs.
 320                          *
 321                          * @since 2.9.0
 322                          *
 323                          * @param array $format Array of oEmbed link types. Accepts 'application/json+oembed',
 324                          *                      'text/xml+oembed', and 'application/xml+oembed' (incorrect,
 325                          *                      used by at least Vimeo).
 326                          */
 327                         $linktypes = apply_filters( 'oembed_linktypes', array(
 328                                 'application/json+oembed' => 'json',
 329                                 'text/xml+oembed' => 'xml',
 330                                 'application/xml+oembed' => 'xml',
 331                         ) );
 332
 333                         // Strip <body>
 334                         $html = substr( $html, 0, stripos( $html, '</head>' ) );
 335
 336                         // Do a quick check
 337                         $tagfound = false;
 338                         foreach ( $linktypes as $linktype => $format ) {
 339                                 if ( stripos($html, $linktype) ) {
 340                                         $tagfound = true;
 341                                         break;
 342                                 }
 343                         }
 344
 345                         if ( $tagfound && preg_match_all( '/<link([^<>]+)>/i', $html, $links ) ) {
 346                                 foreach ( $links[1] as $link ) {
 347                                         $atts = shortcode_parse_atts( $link );
 348
 349                                         if ( !empty($atts['type']) && !empty($linktypes[$atts['type']]) && !empty($atts['href']) ) {
 350                                                 $providers[$linktypes[$atts['type']]] = $atts['href'];
 351
 352                                                 // Stop here if it's JSON (that's all we need)
 353                                                 if ( 'json' == $linktypes[$atts['type']] )
 354                                                         break;
 355                                         }
 356                                 }
 357                         }
 358                 }
 359
 360                 // JSON is preferred to XML
 361                 if ( !empty($providers['json']) )
 362                         return $providers['json'];
 363                 elseif ( !empty($providers['xml']) )
 364                         return $providers['xml'];
 365                 else
 366                         return false;
 367         }
 368
 369         /**
 370          * Connects to a oEmbed provider and returns the result.
 371          *
 372          * @param string $provider The URL to the oEmbed provider.
 373          * @param string $url The URL to the content that is desired to be embedded.
 374          * @param array $args Optional arguments. Usually passed from a shortcode.
 375          * @return bool|object False on failure, otherwise the result in the form of an object.
 376          */
 377         public function fetch( $provider, $url, $args = '' ) {
 378                 $args = wp_parse_args( $args, wp_embed_defaults( $url ) );
 379
 380                 $provider = add_query_arg( 'maxwidth', (int) $args['width'], $provider );
 381                 $provider = add_query_arg( 'maxheight', (int) $args['height'], $provider );
 382                 $provider = add_query_arg( 'url', urlencode($url), $provider );
 383
 384                 /**
 385                  * Filter the oEmbed URL to be fetched.
 386                  *
 387                  * @since 2.9.0
 388                  *
 389                  * @param string $provider URL of the oEmbed provider.
 390                  * @param string $url      URL of the content to be embedded.
 391                  * @param array  $args     Optional arguments, usually passed from a shortcode.
 392                  */
 393                 $provider = apply_filters( 'oembed_fetch_url', $provider, $url, $args );
 394
 395                 foreach( array( 'json', 'xml' ) as $format ) {
 396                         $result = $this->_fetch_with_format( $provider, $format );
 397                         if ( is_wp_error( $result ) && 'not-implemented' == $result->get_error_code() )
 398                                 continue;
 399                         return ( $result && ! is_wp_error( $result ) ) ? $result : false;
 400                 }
 401                 return false;
 402         }
 403
 404         /**
 405          * Fetches result from an oEmbed provider for a specific format and complete provider URL
 406          *
 407          * @since 3.0.0
 408          * @access private
 409          * @param string $provider_url_with_args URL to the provider with full arguments list (url, maxheight, etc.)
 410          * @param string $format Format to use
 411          * @return bool|object False on failure, otherwise the result in the form of an object.
 412          */
 413         private function _fetch_with_format( $provider_url_with_args, $format ) {
 414                 $provider_url_with_args = add_query_arg( 'format', $format, $provider_url_with_args );
 415
 416                 /** This filter is documented in wp-includes/class-oembed.php */
 417                 $args = apply_filters( 'oembed_remote_get_args', array(), $provider_url_with_args );
 418
 419                 $response = wp_safe_remote_get( $provider_url_with_args, $args );
 420                 if ( 501 == wp_remote_retrieve_response_code( $response ) )
 421                         return new WP_Error( 'not-implemented' );
 422                 if ( ! $body = wp_remote_retrieve_body( $response ) )
 423                         return false;
 424                 $parse_method = "_parse_$format";
 425                 return $this->$parse_method( $body );
 426         }
 427
 428         /**
 429          * Parses a json response body.
 430          *
 431          * @since 3.0.0
 432          * @access private
 433          */
 434         private function _parse_json( $response_body ) {
 435                 return ( ( $data = json_decode( trim( $response_body ) ) ) && is_object( $data ) ) ? $data : false;
 436         }
 437
 438         /**
 439          * Parses an XML response body.
 440          *
 441          * @since 3.0.0
 442          * @access private
 443          */
 444         private function _parse_xml( $response_body ) {
 445                 if ( ! function_exists( 'libxml_disable_entity_loader' ) )
 446                         return false;
 447
 448                 $loader = libxml_disable_entity_loader( true );
 449                 $errors = libxml_use_internal_errors( true );
 450
 451                 $return = $this->_parse_xml_body( $response_body );
 452
 453                 libxml_use_internal_errors( $errors );
 454                 libxml_disable_entity_loader( $loader );
 455
 456                 return $return;
 457         }
 458
 459         /**
 460          * Helper function for parsing an XML response body.
 461          *
 462          * @since 3.6.0
 463          * @access private
 464          */
 465         private function _parse_xml_body( $response_body ) {
 466                 if ( ! function_exists( 'simplexml_import_dom' ) || ! class_exists( 'DOMDocument' ) )
 467                         return false;
 468
 469                 $dom = new DOMDocument;
 470                 $success = $dom->loadXML( $response_body );
 471                 if ( ! $success )
 472                         return false;
 473
 474                 if ( isset( $dom->doctype ) )
 475                         return false;
 476
 477                 foreach ( $dom->childNodes as $child ) {
 478                         if ( XML_DOCUMENT_TYPE_NODE === $child->nodeType )
 479                                 return false;
 480                 }
 481
 482                 $xml = simplexml_import_dom( $dom );
 483                 if ( ! $xml )
 484                         return false;
 485
 486                 $return = new stdClass;
 487                 foreach ( $xml as $key => $value ) {
 488                         $return->$key = (string) $value;
 489                 }
 490
 491                 return $return;
 492         }
 493
 494         /**
 495          * Converts a data object from {@link WP_oEmbed::fetch()} and returns the HTML.
 496          *
 497          * @param object $data A data object result from an oEmbed provider.
 498          * @param string $url The URL to the content that is desired to be embedded.
 499          * @return false|string False on error, otherwise the HTML needed to embed.
 500          */
 501         public function data2html( $data, $url ) {
 502                 if ( ! is_object( $data ) || empty( $data->type ) )
 503                         return false;
 504
 505                 $return = false;
 506
 507                 switch ( $data->type ) {
 508                         case 'photo':
 509                                 if ( empty( $data->url ) || empty( $data->width ) || empty( $data->height ) )
 510                                         break;
 511                                 if ( ! is_string( $data->url ) || ! is_numeric( $data->width ) || ! is_numeric( $data->height ) )
 512                                         break;
 513
 514                                 $title = ! empty( $data->title ) && is_string( $data->title ) ? $data->title : '';
 515                                 $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>';
 516                                 break;
 517
 518                         case 'video':
 519                         case 'rich':
 520                                 if ( ! empty( $data->html ) && is_string( $data->html ) )
 521                                         $return = $data->html;
 522                                 break;
 523
 524                         case 'link':
 525                                 if ( ! empty( $data->title ) && is_string( $data->title ) )
 526                                         $return = '<a href="' . esc_url( $url ) . '">' . esc_html( $data->title ) . '</a>';
 527                                 break;
 528
 529                         default:
 530                                 $return = false;
 531                 }
 532
 533                 /**
 534                  * Filter the returned oEmbed HTML.
 535                  *
 536                  * Use this filter to add support for custom data types, or to filter the result.
 537                  *
 538                  * @since 2.9.0
 539                  *
 540                  * @param string $return The returned oEmbed HTML.
 541                  * @param object $data   A data object result from an oEmbed provider.
 542                  * @param string $url    The URL of the content to be embedded.
 543                  */
 544                 return apply_filters( 'oembed_dataparse', $return, $data, $url );
 545         }
 546
 547         /**
 548          * Strip any new lines from the HTML.
 549          *
 550          * @access public
 551          * @param string $html Existing HTML.
 552          * @param object $data Data object from WP_oEmbed::data2html()
 553          * @param string $url The original URL passed to oEmbed.
 554          * @return string Possibly modified $html
 555          */
 556         public function _strip_newlines( $html, $data, $url ) {
 557                 if ( false !== strpos( $html, "\n" ) )
 558                         $html = str_replace( array( "\r\n", "\n" ), '', $html );
 559
 560                 return $html;
 561         }
 562 }
 563
 564 /**
 565  * Returns the initialized {@link WP_oEmbed} object
 566  *
 567  * @since 2.9.0
 568  * @access private
 569  *
 570  * @see WP_oEmbed
 571  *
 572  * @return WP_oEmbed object.
 573  */
 574 function _wp_oembed_get_object() {
 575         static $wp_oembed;
 576
 577         if ( is_null($wp_oembed) )
 578                 $wp_oembed = new WP_oEmbed();
 579
 580         return $wp_oembed;
 581 }