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 https://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         /**
  23          * @static
  24          * @var array
  25          */
  26         public static $early_providers = array();
  27
  28         private $compat_methods = array( '_fetch_with_format', '_parse_json', '_parse_xml', '_parse_body' );
  29
  30         /**
  31          * Constructor
  32          *
  33          * @since 2.9.0
  34          */
  35         public function __construct() {
  36                 $host = urlencode( home_url() );
  37                 $providers = array(
  38                         '#http://((m|www)\.)?youtube\.com/watch.*#i'          => array( 'http://www.youtube.com/oembed',                             true  ),
  39                         '#https://((m|www)\.)?youtube\.com/watch.*#i'         => array( 'http://www.youtube.com/oembed?scheme=https',                true  ),
  40                         '#http://((m|www)\.)?youtube\.com/playlist.*#i'       => array( 'http://www.youtube.com/oembed',                             true  ),
  41                         '#https://((m|www)\.)?youtube\.com/playlist.*#i'      => array( 'http://www.youtube.com/oembed?scheme=https',                true  ),
  42                         '#http://youtu\.be/.*#i'                              => array( 'http://www.youtube.com/oembed',                             true  ),
  43                         '#https://youtu\.be/.*#i'                             => array( 'http://www.youtube.com/oembed?scheme=https',                true  ),
  44                         '#https?://(.+\.)?vimeo\.com/.*#i'                    => array( 'http://vimeo.com/api/oembed.{format}',                      true  ),
  45                         '#https?://(www\.)?dailymotion\.com/.*#i'             => array( 'https://www.dailymotion.com/services/oembed',               true  ),
  46                         'http://dai.ly/*'                                     => array( 'https://www.dailymotion.com/services/oembed',               false ),
  47                         '#https?://(www\.)?flickr\.com/.*#i'                  => array( 'https://www.flickr.com/services/oembed/',                   true  ),
  48                         '#https?://flic\.kr/.*#i'                             => array( 'https://www.flickr.com/services/oembed/',                   true  ),
  49                         '#https?://(.+\.)?smugmug\.com/.*#i'                  => array( 'http://api.smugmug.com/services/oembed/',                   true  ),
  50                         '#https?://(www\.)?hulu\.com/watch/.*#i'              => array( 'http://www.hulu.com/api/oembed.{format}',                   true  ),
  51                         'http://i*.photobucket.com/albums/*'                  => array( 'http://api.photobucket.com/oembed',                         false ),
  52                         'http://gi*.photobucket.com/groups/*'                 => array( 'http://api.photobucket.com/oembed',                         false ),
  53                         '#https?://(www\.)?scribd\.com/doc/.*#i'              => array( 'http://www.scribd.com/services/oembed',                     true  ),
  54                         '#https?://wordpress.tv/.*#i'                         => array( 'http://wordpress.tv/oembed/',                               true  ),
  55                         '#https?://(.+\.)?polldaddy\.com/.*#i'                => array( 'https://polldaddy.com/oembed/',                             true  ),
  56                         '#https?://poll\.fm/.*#i'                             => array( 'https://polldaddy.com/oembed/',                             true  ),
  57                         '#https?://(www\.)?funnyordie\.com/videos/.*#i'       => array( 'http://www.funnyordie.com/oembed',                          true  ),
  58                         '#https?://(www\.)?twitter\.com/.+?/status(es)?/.*#i' => array( 'https://api.twitter.com/1/statuses/oembed.{format}',        true  ),
  59                         '#https?://vine.co/v/.*#i'                            => array( 'https://vine.co/oembed.{format}',                           true  ),
  60                         '#https?://(www\.)?soundcloud\.com/.*#i'              => array( 'http://soundcloud.com/oembed',                              true  ),
  61                         '#https?://(.+?\.)?slideshare\.net/.*#i'              => array( 'https://www.slideshare.net/api/oembed/2',                   true  ),
  62                         '#https?://(www\.)?instagr(\.am|am\.com)/p/.*#i'      => array( 'https://api.instagram.com/oembed',                          true  ),
  63                         '#https?://(open|play)\.spotify\.com/.*#i'            => array( 'https://embed.spotify.com/oembed/',                         true  ),
  64                         '#https?://(.+\.)?imgur\.com/.*#i'                    => array( 'http://api.imgur.com/oembed',                               true  ),
  65                         '#https?://(www\.)?meetu(\.ps|p\.com)/.*#i'           => array( 'http://api.meetup.com/oembed',                              true  ),
  66                         '#https?://(www\.)?issuu\.com/.+/docs/.+#i'           => array( 'http://issuu.com/oembed_wp',                                true  ),
  67                         '#https?://(www\.)?collegehumor\.com/video/.*#i'      => array( 'http://www.collegehumor.com/oembed.{format}',               true  ),
  68                         '#https?://(www\.)?mixcloud\.com/.*#i'                => array( 'http://www.mixcloud.com/oembed',                            true  ),
  69                         '#https?://(www\.|embed\.)?ted\.com/talks/.*#i'       => array( 'http://www.ted.com/talks/oembed.{format}',                  true  ),
  70                         '#https?://(www\.)?(animoto|video214)\.com/play/.*#i' => array( 'https://animoto.com/oembeds/create',                        true  ),
  71                         '#https?://(.+)\.tumblr\.com/post/.*#i'               => array( 'https://www.tumblr.com/oembed/1.0',                         true  ),
  72                         '#https?://(www\.)?kickstarter\.com/projects/.*#i'    => array( 'https://www.kickstarter.com/services/oembed',               true  ),
  73                         '#https?://kck\.st/.*#i'                              => array( 'https://www.kickstarter.com/services/oembed',               true  ),
  74                         '#https?://cloudup\.com/.*#i'                         => array( 'https://cloudup.com/oembed',                                true  ),
  75                         '#https?://(www\.)?reverbnation\.com/.*#i'            => array( 'https://www.reverbnation.com/oembed',                       true  ),
  76                         '#https?://videopress.com/v/.*#'                      => array( 'https://public-api.wordpress.com/oembed/1.0/?for=' . $host, true  ),
  77                         '#https?://(www\.)?reddit\.com/r/[^/]+/comments/.*#i' => array( 'https://www.reddit.com/oembed',                             true  ),
  78                         '#https?://(www\.)?speakerdeck\.com/.*#i'             => array( 'https://speakerdeck.com/oembed.{format}',                   true  ),
  79                 );
  80
  81                 if ( ! empty( self::$early_providers['add'] ) ) {
  82                         foreach ( self::$early_providers['add'] as $format => $data ) {
  83                                 $providers[ $format ] = $data;
  84                         }
  85                 }
  86
  87                 if ( ! empty( self::$early_providers['remove'] ) ) {
  88                         foreach ( self::$early_providers['remove'] as $format ) {
  89                                 unset( $providers[ $format ] );
  90                         }
  91                 }
  92
  93                 self::$early_providers = array();
  94
  95                 /**
  96                  * Filter the list of whitelisted oEmbed providers.
  97                  *
  98                  * Since WordPress 4.4, oEmbed discovery is enabled for all users and allows embedding of sanitized
  99                  * iframes. The providers in this list are whitelisted, meaning they are trusted and allowed to
 100                  * embed any content, such as iframes, videos, JavaScript, and arbitrary HTML.
 101                  *
 102                  * Supported providers:
 103                  *
 104                  * |   Provider   |        Flavor        | HTTPS |   Since   |
 105                  * | ------------ | -------------------- | :---: | --------- |
 106                  * | Dailymotion  | dailymotion.com      |  Yes  | 2.9.0     |
 107                  * | Flickr       | flickr.com           |  Yes  | 2.9.0     |
 108                  * | Hulu         | hulu.com             |  Yes  | 2.9.0     |
 109                  * | Photobucket  | photobucket.com      |  No   | 2.9.0     |
 110                  * | Scribd       | scribd.com           |  Yes  | 2.9.0     |
 111                  * | Vimeo        | vimeo.com            |  Yes  | 2.9.0     |
 112                  * | WordPress.tv | wordpress.tv         |  Yes  | 2.9.0     |
 113                  * | YouTube      | youtube.com/watch    |  Yes  | 2.9.0     |
 114                  * | Funny or Die | funnyordie.com       |  Yes  | 3.0.0     |
 115                  * | Polldaddy    | polldaddy.com        |  Yes  | 3.0.0     |
 116                  * | SmugMug      | smugmug.com          |  Yes  | 3.0.0     |
 117                  * | YouTube      | youtu.be             |  Yes  | 3.0.0     |
 118                  * | Twitter      | twitter.com          |  Yes  | 3.4.0     |
 119                  * | Instagram    | instagram.com        |  Yes  | 3.5.0     |
 120                  * | Instagram    | instagr.am           |  Yes  | 3.5.0     |
 121                  * | Slideshare   | slideshare.net       |  Yes  | 3.5.0     |
 122                  * | SoundCloud   | soundcloud.com       |  Yes  | 3.5.0     |
 123                  * | Dailymotion  | dai.ly               |  No   | 3.6.0     |
 124                  * | Flickr       | flic.kr              |  Yes  | 3.6.0     |
 125                  * | Spotify      | spotify.com          |  Yes  | 3.6.0     |
 126                  * | Imgur        | imgur.com            |  Yes  | 3.9.0     |
 127                  * | Meetup.com   | meetup.com           |  Yes  | 3.9.0     |
 128                  * | Meetup.com   | meetu.ps             |  Yes  | 3.9.0     |
 129                  * | Animoto      | animoto.com          |  Yes  | 4.0.0     |
 130                  * | Animoto      | video214.com         |  Yes  | 4.0.0     |
 131                  * | CollegeHumor | collegehumor.com     |  Yes  | 4.0.0     |
 132                  * | Issuu        | issuu.com            |  Yes  | 4.0.0     |
 133                  * | Mixcloud     | mixcloud.com         |  Yes  | 4.0.0     |
 134                  * | Polldaddy    | poll.fm              |  Yes  | 4.0.0     |
 135                  * | TED          | ted.com              |  Yes  | 4.0.0     |
 136                  * | YouTube      | youtube.com/playlist |  Yes  | 4.0.0     |
 137                  * | Vine         | vine.co              |  Yes  | 4.1.0     |
 138                  * | Tumblr       | tumblr.com           |  Yes  | 4.2.0     |
 139                  * | Kickstarter  | kickstarter.com      |  Yes  | 4.2.0     |
 140                  * | Kickstarter  | kck.st               |  Yes  | 4.2.0     |
 141                  * | Cloudup      | cloudup.com          |  Yes  | 4.4.0     |
 142                  * | ReverbNation | reverbnation.com     |  Yes  | 4.4.0     |
 143                  * | VideoPress   | videopress.com       |  Yes  | 4.4.0     |
 144                  * | Reddit       | reddit.com           |  Yes  | 4.4.0     |
 145                  * | Speaker Deck | speakerdeck.com      |  Yes  | 4.4.0     |
 146                  *
 147                  * No longer supported providers:
 148                  *
 149                  * |   Provider   |        Flavor        | HTTPS |   Since   |  Removed  |
 150                  * | ------------ | -------------------- | :---: | --------- | --------- |
 151                  * | Qik          | qik.com              |  Yes  | 2.9.0     | 3.9.0     |
 152                  * | Viddler      | viddler.com          |  Yes  | 2.9.0     | 4.0.0     |
 153                  * | Revision3    | revision3.com        |  No   | 2.9.0     | 4.2.0     |
 154                  * | Blip         | blip.tv              |  No   | 2.9.0     | 4.4.0     |
 155                  * | Rdio         | rdio.com             |  Yes  | 3.6.0     | 4.4.1     |
 156                  * | Rdio         | rd.io                |  Yes  | 3.6.0     | 4.4.1     |
 157                  *
 158                  * @see wp_oembed_add_provider()
 159                  *
 160                  * @since 2.9.0
 161                  *
 162                  * @param array $providers An array of popular oEmbed providers.
 163                  */
 164                 $this->providers = apply_filters( 'oembed_providers', $providers );
 165
 166                 // Fix any embeds that contain new lines in the middle of the HTML which breaks wpautop().
 167                 add_filter( 'oembed_dataparse', array($this, '_strip_newlines'), 10, 3 );
 168         }
 169
 170         /**
 171          * Make private/protected methods readable for backwards compatibility.
 172          *
 173          * @since 4.0.0
 174          * @access public
 175          *
 176          * @param callable $name      Method to call.
 177          * @param array    $arguments Arguments to pass when calling.
 178          * @return mixed|bool Return value of the callback, false otherwise.
 179          */
 180         public function __call( $name, $arguments ) {
 181                 if ( in_array( $name, $this->compat_methods ) ) {
 182                         return call_user_func_array( array( $this, $name ), $arguments );
 183                 }
 184                 return false;
 185         }
 186
 187         /**
 188          * Takes a URL and returns the corresponding oEmbed provider's URL, if there is one.
 189          *
 190          * @since 4.0.0
 191          * @access public
 192          *
 193          * @see WP_oEmbed::discover()
 194          *
 195          * @param string        $url  The URL to the content.
 196          * @param string|array  $args Optional provider arguments.
 197          * @return false|string False on failure, otherwise the oEmbed provider URL.
 198          */
 199         public function get_provider( $url, $args = '' ) {
 200
 201                 $provider = false;
 202
 203                 if ( !isset($args['discover']) )
 204                         $args['discover'] = true;
 205
 206                 foreach ( $this->providers as $matchmask => $data ) {
 207                         list( $providerurl, $regex ) = $data;
 208
 209                         // Turn the asterisk-type provider URLs into regex
 210                         if ( !$regex ) {
 211                                 $matchmask = '#' . str_replace( '___wildcard___', '(.+)', preg_quote( str_replace( '*', '___wildcard___', $matchmask ), '#' ) ) . '#i';
 212                                 $matchmask = preg_replace( '|^#http\\\://|', '#https?\://', $matchmask );
 213                         }
 214
 215                         if ( preg_match( $matchmask, $url ) ) {
 216                                 $provider = str_replace( '{format}', 'json', $providerurl ); // JSON is easier to deal with than XML
 217                                 break;
 218                         }
 219                 }
 220
 221                 if ( !$provider && $args['discover'] )
 222                         $provider = $this->discover( $url );
 223
 224                 return $provider;
 225         }
 226
 227         /**
 228          * Add an oEmbed provider just-in-time when wp_oembed_add_provider() is called
 229          * before the 'plugins_loaded' hook.
 230          *
 231          * The just-in-time addition is for the benefit of the 'oembed_providers' filter.
 232          *
 233          * @since 4.0.0
 234          * @access public
 235          * @static
 236          *
 237          * @see wp_oembed_add_provider()
 238          *
 239          * @param string $format   Format of URL that this provider can handle. You can use
 240          *                         asterisks as wildcards.
 241          * @param string $provider The URL to the oEmbed provider..
 242          * @param bool   $regex    Optional. Whether the $format parameter is in a regex format.
 243          *                         Default false.
 244          */
 245         public static function _add_provider_early( $format, $provider, $regex = false ) {
 246                 if ( empty( self::$early_providers['add'] ) ) {
 247                         self::$early_providers['add'] = array();
 248                 }
 249
 250                 self::$early_providers['add'][ $format ] = array( $provider, $regex );
 251         }
 252
 253         /**
 254          * Remove an oEmbed provider just-in-time when wp_oembed_remove_provider() is called
 255          * before the 'plugins_loaded' hook.
 256          *
 257          * The just-in-time removal is for the benefit of the 'oembed_providers' filter.
 258          *
 259          * @since 4.0.0
 260          * @access public
 261          * @static
 262          *
 263          * @see wp_oembed_remove_provider()
 264          *
 265          * @param string $format The format of URL that this provider can handle. You can use
 266          *                       asterisks as wildcards.
 267          */
 268         public static function _remove_provider_early( $format ) {
 269                 if ( empty( self::$early_providers['remove'] ) ) {
 270                         self::$early_providers['remove'] = array();
 271                 }
 272
 273                 self::$early_providers['remove'][] = $format;
 274         }
 275
 276         /**
 277          * The do-it-all function that takes a URL and attempts to return the HTML.
 278          *
 279          * @see WP_oEmbed::fetch()
 280          * @see WP_oEmbed::data2html()
 281          *
 282          * @param string $url The URL to the content that should be attempted to be embedded.
 283          * @param array $args Optional arguments. Usually passed from a shortcode.
 284          * @return false|string False on failure, otherwise the UNSANITIZED (and potentially unsafe) HTML that should be used to embed.
 285          */
 286         public function get_html( $url, $args = '' ) {
 287                 $provider = $this->get_provider( $url, $args );
 288
 289                 if ( !$provider || false === $data = $this->fetch( $provider, $url, $args ) )
 290                         return false;
 291
 292                 /**
 293                  * Filter the HTML returned by the oEmbed provider.
 294                  *
 295                  * @since 2.9.0
 296                  *
 297                  * @param string $data The returned oEmbed HTML.
 298                  * @param string $url  URL of the content to be embedded.
 299                  * @param array  $args Optional arguments, usually passed from a shortcode.
 300                  */
 301                 return apply_filters( 'oembed_result', $this->data2html( $data, $url ), $url, $args );
 302         }
 303
 304         /**
 305          * Attempts to discover link tags at the given URL for an oEmbed provider.
 306          *
 307          * @param string $url The URL that should be inspected for discovery `<link>` tags.
 308          * @return false|string False on failure, otherwise the oEmbed provider URL.
 309          */
 310         public function discover( $url ) {
 311                 $providers = array();
 312
 313                 /**
 314                  * Filter oEmbed remote get arguments.
 315                  *
 316                  * @since 4.0.0
 317                  *
 318                  * @see WP_Http::request()
 319                  *
 320                  * @param array  $args oEmbed remote get arguments.
 321                  * @param string $url  URL to be inspected.
 322                  */
 323                 $args = apply_filters( 'oembed_remote_get_args', array(), $url );
 324
 325                 // Fetch URL content
 326                 $request = wp_safe_remote_get( $url, $args );
 327                 if ( $html = wp_remote_retrieve_body( $request ) ) {
 328
 329                         /**
 330                          * Filter the link types that contain oEmbed provider URLs.
 331                          *
 332                          * @since 2.9.0
 333                          *
 334                          * @param array $format Array of oEmbed link types. Accepts 'application/json+oembed',
 335                          *                      'text/xml+oembed', and 'application/xml+oembed' (incorrect,
 336                          *                      used by at least Vimeo).
 337                          */
 338                         $linktypes = apply_filters( 'oembed_linktypes', array(
 339                                 'application/json+oembed' => 'json',
 340                                 'text/xml+oembed' => 'xml',
 341                                 'application/xml+oembed' => 'xml',
 342                         ) );
 343
 344                         // Strip <body>
 345                         $html = substr( $html, 0, stripos( $html, '</head>' ) );
 346
 347                         // Do a quick check
 348                         $tagfound = false;
 349                         foreach ( $linktypes as $linktype => $format ) {
 350                                 if ( stripos($html, $linktype) ) {
 351                                         $tagfound = true;
 352                                         break;
 353                                 }
 354                         }
 355
 356                         if ( $tagfound && preg_match_all( '#<link([^<>]+)/?>#iU', $html, $links ) ) {
 357                                 foreach ( $links[1] as $link ) {
 358                                         $atts = shortcode_parse_atts( $link );
 359
 360                                         if ( !empty($atts['type']) && !empty($linktypes[$atts['type']]) && !empty($atts['href']) ) {
 361                                                 $providers[$linktypes[$atts['type']]] = htmlspecialchars_decode( $atts['href'] );
 362
 363                                                 // Stop here if it's JSON (that's all we need)
 364                                                 if ( 'json' == $linktypes[$atts['type']] )
 365                                                         break;
 366                                         }
 367                                 }
 368                         }
 369                 }
 370
 371                 // JSON is preferred to XML
 372                 if ( !empty($providers['json']) )
 373                         return $providers['json'];
 374                 elseif ( !empty($providers['xml']) )
 375                         return $providers['xml'];
 376                 else
 377                         return false;
 378         }
 379
 380         /**
 381          * Connects to a oEmbed provider and returns the result.
 382          *
 383          * @param string $provider The URL to the oEmbed provider.
 384          * @param string $url The URL to the content that is desired to be embedded.
 385          * @param array $args Optional arguments. Usually passed from a shortcode.
 386          * @return false|object False on failure, otherwise the result in the form of an object.
 387          */
 388         public function fetch( $provider, $url, $args = '' ) {
 389                 $args = wp_parse_args( $args, wp_embed_defaults( $url ) );
 390
 391                 $provider = add_query_arg( 'maxwidth', (int) $args['width'], $provider );
 392                 $provider = add_query_arg( 'maxheight', (int) $args['height'], $provider );
 393                 $provider = add_query_arg( 'url', urlencode($url), $provider );
 394
 395                 /**
 396                  * Filter the oEmbed URL to be fetched.
 397                  *
 398                  * @since 2.9.0
 399                  *
 400                  * @param string $provider URL of the oEmbed provider.
 401                  * @param string $url      URL of the content to be embedded.
 402                  * @param array  $args     Optional arguments, usually passed from a shortcode.
 403                  */
 404                 $provider = apply_filters( 'oembed_fetch_url', $provider, $url, $args );
 405
 406                 foreach ( array( 'json', 'xml' ) as $format ) {
 407                         $result = $this->_fetch_with_format( $provider, $format );
 408                         if ( is_wp_error( $result ) && 'not-implemented' == $result->get_error_code() )
 409                                 continue;
 410                         return ( $result && ! is_wp_error( $result ) ) ? $result : false;
 411                 }
 412                 return false;
 413         }
 414
 415         /**
 416          * Fetches result from an oEmbed provider for a specific format and complete provider URL
 417          *
 418          * @since 3.0.0
 419          * @access private
 420          * @param string $provider_url_with_args URL to the provider with full arguments list (url, maxheight, etc.)
 421          * @param string $format Format to use
 422          * @return false|object|WP_Error False on failure, otherwise the result in the form of an object.
 423          */
 424         private function _fetch_with_format( $provider_url_with_args, $format ) {
 425                 $provider_url_with_args = add_query_arg( 'format', $format, $provider_url_with_args );
 426
 427                 /** This filter is documented in wp-includes/class-oembed.php */
 428                 $args = apply_filters( 'oembed_remote_get_args', array(), $provider_url_with_args );
 429
 430                 $response = wp_safe_remote_get( $provider_url_with_args, $args );
 431                 if ( 501 == wp_remote_retrieve_response_code( $response ) )
 432                         return new WP_Error( 'not-implemented' );
 433                 if ( ! $body = wp_remote_retrieve_body( $response ) )
 434                         return false;
 435                 $parse_method = "_parse_$format";
 436                 return $this->$parse_method( $body );
 437         }
 438
 439         /**
 440          * Parses a json response body.
 441          *
 442          * @since 3.0.0
 443          * @access private
 444          *
 445          * @param string $response_body
 446          * @return object|false
 447          */
 448         private function _parse_json( $response_body ) {
 449                 $data = json_decode( trim( $response_body ) );
 450                 return ( $data && is_object( $data ) ) ? $data : false;
 451         }
 452
 453         /**
 454          * Parses an XML response body.
 455          *
 456          * @since 3.0.0
 457          * @access private
 458          *
 459          * @param string $response_body
 460          * @return object|false
 461          */
 462         private function _parse_xml( $response_body ) {
 463                 if ( ! function_exists( 'libxml_disable_entity_loader' ) )
 464                         return false;
 465
 466                 $loader = libxml_disable_entity_loader( true );
 467                 $errors = libxml_use_internal_errors( true );
 468
 469                 $return = $this->_parse_xml_body( $response_body );
 470
 471                 libxml_use_internal_errors( $errors );
 472                 libxml_disable_entity_loader( $loader );
 473
 474                 return $return;
 475         }
 476
 477         /**
 478          * Helper function for parsing an XML response body.
 479          *
 480          * @since 3.6.0
 481          * @access private
 482          *
 483          * @param string $response_body
 484          * @return object|false
 485          */
 486         private function _parse_xml_body( $response_body ) {
 487                 if ( ! function_exists( 'simplexml_import_dom' ) || ! class_exists( 'DOMDocument', false ) )
 488                         return false;
 489
 490                 $dom = new DOMDocument;
 491                 $success = $dom->loadXML( $response_body );
 492                 if ( ! $success )
 493                         return false;
 494
 495                 if ( isset( $dom->doctype ) )
 496                         return false;
 497
 498                 foreach ( $dom->childNodes as $child ) {
 499                         if ( XML_DOCUMENT_TYPE_NODE === $child->nodeType )
 500                                 return false;
 501                 }
 502
 503                 $xml = simplexml_import_dom( $dom );
 504                 if ( ! $xml )
 505                         return false;
 506
 507                 $return = new stdClass;
 508                 foreach ( $xml as $key => $value ) {
 509                         $return->$key = (string) $value;
 510                 }
 511
 512                 return $return;
 513         }
 514
 515         /**
 516          * Converts a data object from {@link WP_oEmbed::fetch()} and returns the HTML.
 517          *
 518          * @param object $data A data object result from an oEmbed provider.
 519          * @param string $url The URL to the content that is desired to be embedded.
 520          * @return false|string False on error, otherwise the HTML needed to embed.
 521          */
 522         public function data2html( $data, $url ) {
 523                 if ( ! is_object( $data ) || empty( $data->type ) )
 524                         return false;
 525
 526                 $return = false;
 527
 528                 switch ( $data->type ) {
 529                         case 'photo':
 530                                 if ( empty( $data->url ) || empty( $data->width ) || empty( $data->height ) )
 531                                         break;
 532                                 if ( ! is_string( $data->url ) || ! is_numeric( $data->width ) || ! is_numeric( $data->height ) )
 533                                         break;
 534
 535                                 $title = ! empty( $data->title ) && is_string( $data->title ) ? $data->title : '';
 536                                 $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>';
 537                                 break;
 538
 539                         case 'video':
 540                         case 'rich':
 541                                 if ( ! empty( $data->html ) && is_string( $data->html ) )
 542                                         $return = $data->html;
 543                                 break;
 544
 545                         case 'link':
 546                                 if ( ! empty( $data->title ) && is_string( $data->title ) )
 547                                         $return = '<a href="' . esc_url( $url ) . '">' . esc_html( $data->title ) . '</a>';
 548                                 break;
 549
 550                         default:
 551                                 $return = false;
 552                 }
 553
 554                 /**
 555                  * Filter the returned oEmbed HTML.
 556                  *
 557                  * Use this filter to add support for custom data types, or to filter the result.
 558                  *
 559                  * @since 2.9.0
 560                  *
 561                  * @param string $return The returned oEmbed HTML.
 562                  * @param object $data   A data object result from an oEmbed provider.
 563                  * @param string $url    The URL of the content to be embedded.
 564                  */
 565                 return apply_filters( 'oembed_dataparse', $return, $data, $url );
 566         }
 567
 568         /**
 569          * Strip any new lines from the HTML.
 570          *
 571          * @access public
 572          * @param string $html Existing HTML.
 573          * @param object $data Data object from WP_oEmbed::data2html()
 574          * @param string $url The original URL passed to oEmbed.
 575          * @return string Possibly modified $html
 576          */
 577         public function _strip_newlines( $html, $data, $url ) {
 578                 if ( false === strpos( $html, "\n" ) ) {
 579                         return $html;
 580                 }
 581
 582                 $count = 1;
 583                 $found = array();
 584                 $token = '__PRE__';
 585                 $search = array( "\t", "\n", "\r", ' ' );
 586                 $replace = array( '__TAB__', '__NL__', '__CR__', '__SPACE__' );
 587                 $tokenized = str_replace( $search, $replace, $html );
 588
 589                 preg_match_all( '#(<pre[^>]*>.+?</pre>)#i', $tokenized, $matches, PREG_SET_ORDER );
 590                 foreach ( $matches as $i => $match ) {
 591                         $tag_html = str_replace( $replace, $search, $match[0] );
 592                         $tag_token = $token . $i;
 593
 594                         $found[ $tag_token ] = $tag_html;
 595                         $html = str_replace( $tag_html, $tag_token, $html, $count );
 596                 }
 597
 598                 $replaced = str_replace( $replace, $search, $html );
 599                 $stripped = str_replace( array( "\r\n", "\n" ), '', $replaced );
 600                 $pre = array_values( $found );
 601                 $tokens = array_keys( $found );
 602
 603                 return str_replace( $tokens, $pre, $stripped );
 604         }
 605 }
 606
 607 /**
 608  * Returns the initialized {@link WP_oEmbed} object
 609  *
 610  * @since 2.9.0
 611  * @access private
 612  *
 613  * @staticvar WP_oEmbed $wp_oembed
 614  *
 615  * @return WP_oEmbed object.
 616  */
 617 function _wp_oembed_get_object() {
 618         static $wp_oembed = null;
 619
 620         if ( is_null( $wp_oembed ) ) {
 621                 $wp_oembed = new WP_oEmbed();
 622         }
 623         return $wp_oembed;
 624 }