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                 $providers = array(
  37                         '#http://((m|www)\.)?youtube\.com/watch.*#i'          => array( 'http://www.youtube.com/oembed',                      true  ),
  38                         '#https://((m|www)\.)?youtube\.com/watch.*#i'         => array( 'http://www.youtube.com/oembed?scheme=https',         true  ),
  39                         '#http://((m|www)\.)?youtube\.com/playlist.*#i'       => array( 'http://www.youtube.com/oembed',                      true  ),
  40                         '#https://((m|www)\.)?youtube\.com/playlist.*#i'      => array( 'http://www.youtube.com/oembed?scheme=https',         true  ),
  41                         '#http://youtu\.be/.*#i'                              => array( 'http://www.youtube.com/oembed',                      true  ),
  42                         '#https://youtu\.be/.*#i'                             => array( 'http://www.youtube.com/oembed?scheme=https',         true  ),
  43                         'http://blip.tv/*'                                    => array( 'http://blip.tv/oembed/',                             false ),
  44                         '#https?://(.+\.)?vimeo\.com/.*#i'                    => array( 'http://vimeo.com/api/oembed.{format}',               true  ),
  45                         '#https?://(www\.)?dailymotion\.com/.*#i'             => array( 'http://www.dailymotion.com/services/oembed',         true  ),
  46                         'http://dai.ly/*'                                     => array( 'http://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://photobucket.com/oembed',                      false ),
  52                         'http://gi*.photobucket.com/groups/*'                 => array( 'http://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?://instagr(\.am|am\.com)/p/.*#i'              => array( 'https://api.instagram.com/oembed',                   true  ),
  63                         '#https?://(www\.)?rdio\.com/.*#i'                    => array( 'http://www.rdio.com/api/oembed/',                    true  ),
  64                         '#https?://rd\.io/x/.*#i'                             => array( 'http://www.rdio.com/api/oembed/',                    true  ),
  65                         '#https?://(open|play)\.spotify\.com/.*#i'            => array( 'https://embed.spotify.com/oembed/',                  true  ),
  66                         '#https?://(.+\.)?imgur\.com/.*#i'                    => array( 'http://api.imgur.com/oembed',                        true  ),
  67                         '#https?://(www\.)?meetu(\.ps|p\.com)/.*#i'           => array( 'http://api.meetup.com/oembed',                       true  ),
  68                         '#https?://(www\.)?issuu\.com/.+/docs/.+#i'           => array( 'http://issuu.com/oembed_wp',                         true  ),
  69                         '#https?://(www\.)?collegehumor\.com/video/.*#i'      => array( 'http://www.collegehumor.com/oembed.{format}',        true  ),
  70                         '#https?://(www\.)?mixcloud\.com/.*#i'                => array( 'http://www.mixcloud.com/oembed',                     true  ),
  71                         '#https?://(www\.|embed\.)?ted\.com/talks/.*#i'       => array( 'http://www.ted.com/talks/oembed.{format}',           true  ),
  72                         '#https?://(www\.)?(animoto|video214)\.com/play/.*#i' => array( 'http://animoto.com/oembeds/create',                  true  ),
  73                         '#https?://(.+)\.tumblr\.com/post/.*#i'               => array( 'https://www.tumblr.com/oembed/1.0',                  true  ),
  74                         '#https?://(www\.)?kickstarter\.com/projects/.*#i'    => array( 'https://www.kickstarter.com/services/oembed',        true  ),
  75                         '#https?://kck\.st/.*#i'                              => array( 'https://www.kickstarter.com/services/oembed',        true  ),
  76                         '#https?://cloudup\.com/.*#i'                         => array( 'https://cloudup.com/oembed', true ),
  77                 );
  78
  79                 if ( ! empty( self::$early_providers['add'] ) ) {
  80                         foreach ( self::$early_providers['add'] as $format => $data ) {
  81                                 $providers[ $format ] = $data;
  82                         }
  83                 }
  84
  85                 if ( ! empty( self::$early_providers['remove'] ) ) {
  86                         foreach ( self::$early_providers['remove'] as $format ) {
  87                                 unset( $providers[ $format ] );
  88                         }
  89                 }
  90
  91                 self::$early_providers = array();
  92
  93                 /**
  94                  * Filter the list of oEmbed providers.
  95                  *
  96                  * Discovery is disabled for users lacking the unfiltered_html capability.
  97                  * Only providers in this array will be used for those users.
  98                  *
  99                  * Supported providers:
 100                  *
 101                  * | ------------ | -------------------- | ----- | --------- |
 102                  * |   Provider   |        Flavor        |  SSL  |   Since   |
 103                  * | ------------ | -------------------- | ----- | --------- |
 104                  * | Blip         | blip.tv              |   !   | 2.9.0     |
 105                  * | Dailymotion  | dailymotion.com      |  Yes  | 2.9.0     |
 106                  * | Flickr       | flickr.com           |  Yes  | 2.9.0     |
 107                  * | Hulu         | hulu.com             |  Yes  | 2.9.0     |
 108                  * | Photobucket  | photobucket.com      |   !   | 2.9.0     |
 109                  * | Scribd       | scribd.com           |  Yes  | 2.9.0     |
 110                  * | Vimeo        | vimeo.com            |  Yes  | 2.9.0     |
 111                  * | WordPress.tv | wordpress.tv         |  Yes  | 2.9.0     |
 112                  * | YouTube      | youtube.com/watch    |  Yes  | 2.9.0     |
 113                  * | ------------ | -------------------- | ----- | --------- |
 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                  * | ------------ | -------------------- | ----- | --------- |
 119                  * | Twitter      | twitter.com          |  Yes  | 3.4.0     |
 120                  * | ------------ | -------------------- | ----- | --------- |
 121                  * | Instagram    | instagram.com        |  Yes  | 3.5.0     |
 122                  * | Instagram    | instagr.am           |  Yes  | 3.5.0     |
 123                  * | Slideshare   | slideshare.net       |  Yes  | 3.5.0     |
 124                  * | SoundCloud   | soundcloud.com       |  Yes  | 3.5.0     |
 125                  * | ------------ | -------------------- | ----- | --------- |
 126                  * | Dailymotion  | dai.ly               |   !   | 3.6.0     |
 127                  * | Flickr       | flic.kr              |  Yes  | 3.6.0     |
 128                  * | Rdio         | rdio.com             |  Yes  | 3.6.0     |
 129                  * | Rdio         | rd.io                |  Yes  | 3.6.0     |
 130                  * | Spotify      | spotify.com          |  Yes  | 3.6.0     |
 131                  * | ------------ | -------------------- | ----- | --------- |
 132                  * | Imgur        | imgur.com            |  Yes  | 3.9.0     |
 133                  * | Meetup.com   | meetup.com           |  Yes  | 3.9.0     |
 134                  * | Meetup.com   | meetu.ps             |  Yes  | 3.9.0     |
 135                  * | ------------ | -------------------- | ----- | --------- |
 136                  * | Animoto      | animoto.com          |  Yes  | 4.0.0     |
 137                  * | Animoto      | video214.com         |  Yes  | 4.0.0     |
 138                  * | CollegeHumor | collegehumor.com     |  Yes  | 4.0.0     |
 139                  * | Issuu        | issuu.com            |  Yes  | 4.0.0     |
 140                  * | Mixcloud     | mixcloud.com         |  Yes  | 4.0.0     |
 141                  * | Polldaddy    | poll.fm              |  Yes  | 4.0.0     |
 142                  * | TED          | ted.com              |  Yes  | 4.0.0     |
 143                  * | YouTube      | youtube.com/playlist |  Yes  | 4.0.0     |
 144                  * | ------------ | -------------------- | ----- | --------- |
 145                  * | Vine         | vine.co              |  Yes  | 4.1.0     |
 146                  * | ------------ | -------------------- | ----- | --------- |
 147                  * | Tumblr       | tumblr.com           |  Yes  | 4.2.0     |
 148                  * | Kickstarter  | kickstarter.com      |  Yes  | 4.2.0     |
 149                  * | Kickstarter  | kck.st               |  Yes  | 4.2.0     |
 150                  * | ------------ | -------------------- | ----- | --------- |
 151                  *
 152                  * No longer supported providers:
 153                  *
 154                  * | ------------ | -------------------- | ----- | --------- | --------- |
 155                  * |   Provider   |        Flavor        |  SSL  |   Since   |  Removed  |
 156                  * | ------------ | -------------------- | ----- | --------- | --------- |
 157                  * | Qik          | qik.com              |  Yes  | 2.9.0     | 3.9.0     |
 158                  * | ------------ | -------------------- | ----- | --------- | --------- |
 159                  * | Viddler      | viddler.com          |  Yes  | 2.9.0     | 4.0.0     |
 160                  * | ------------ | -------------------- | ----- | --------- | --------- |
 161                  * | Revision3    | revision3.com        |   !   | 2.9.0     | 4.2.0     |
 162                  * | ------------ | -------------------- | ----- | --------- | --------- |
 163                  *
 164                  * @see wp_oembed_add_provider()
 165                  *
 166                  * @since 2.9.0
 167                  *
 168                  * @param array $providers An array of popular oEmbed providers.
 169                  */
 170                 $this->providers = apply_filters( 'oembed_providers', $providers );
 171
 172                 // Fix any embeds that contain new lines in the middle of the HTML which breaks wpautop().
 173                 add_filter( 'oembed_dataparse', array($this, '_strip_newlines'), 10, 3 );
 174         }
 175
 176         /**
 177          * Make private/protected methods readable for backwards compatibility.
 178          *
 179          * @since 4.0.0
 180          * @access public
 181          *
 182          * @param callable $name      Method to call.
 183          * @param array    $arguments Arguments to pass when calling.
 184          * @return mixed|bool Return value of the callback, false otherwise.
 185          */
 186         public function __call( $name, $arguments ) {
 187                 if ( in_array( $name, $this->compat_methods ) ) {
 188                         return call_user_func_array( array( $this, $name ), $arguments );
 189                 }
 190                 return false;
 191         }
 192
 193         /**
 194          * Takes a URL and returns the corresponding oEmbed provider's URL, if there is one.
 195          *
 196          * @since 4.0.0
 197          * @access public
 198          *
 199          * @see WP_oEmbed::discover()
 200          *
 201          * @param string        $url  The URL to the content.
 202          * @param string|array  $args Optional provider arguments.
 203          * @return false|string False on failure, otherwise the oEmbed provider URL.
 204          */
 205         public function get_provider( $url, $args = '' ) {
 206
 207                 $provider = false;
 208
 209                 if ( !isset($args['discover']) )
 210                         $args['discover'] = true;
 211
 212                 foreach ( $this->providers as $matchmask => $data ) {
 213                         list( $providerurl, $regex ) = $data;
 214
 215                         // Turn the asterisk-type provider URLs into regex
 216                         if ( !$regex ) {
 217                                 $matchmask = '#' . str_replace( '___wildcard___', '(.+)', preg_quote( str_replace( '*', '___wildcard___', $matchmask ), '#' ) ) . '#i';
 218                                 $matchmask = preg_replace( '|^#http\\\://|', '#https?\://', $matchmask );
 219                         }
 220
 221                         if ( preg_match( $matchmask, $url ) ) {
 222                                 $provider = str_replace( '{format}', 'json', $providerurl ); // JSON is easier to deal with than XML
 223                                 break;
 224                         }
 225                 }
 226
 227                 if ( !$provider && $args['discover'] )
 228                         $provider = $this->discover( $url );
 229
 230                 return $provider;
 231         }
 232
 233         /**
 234          * Add an oEmbed provider just-in-time when wp_oembed_add_provider() is called
 235          * before the 'plugins_loaded' hook.
 236          *
 237          * The just-in-time addition is for the benefit of the 'oembed_providers' filter.
 238          *
 239          * @since 4.0.0
 240          * @access public
 241          * @static
 242          *
 243          * @see wp_oembed_add_provider()
 244          *
 245          * @param string $format   Format of URL that this provider can handle. You can use
 246          *                         asterisks as wildcards.
 247          * @param string $provider The URL to the oEmbed provider..
 248          * @param bool   $regex    Optional. Whether the $format parameter is in a regex format.
 249          *                         Default false.
 250          */
 251         public static function _add_provider_early( $format, $provider, $regex = false ) {
 252                 if ( empty( self::$early_providers['add'] ) ) {
 253                         self::$early_providers['add'] = array();
 254                 }
 255
 256                 self::$early_providers['add'][ $format ] = array( $provider, $regex );
 257         }
 258
 259         /**
 260          * Remove an oEmbed provider just-in-time when wp_oembed_remove_provider() is called
 261          * before the 'plugins_loaded' hook.
 262          *
 263          * The just-in-time removal is for the benefit of the 'oembed_providers' filter.
 264          *
 265          * @since 4.0.0
 266          * @access public
 267          * @static
 268          *
 269          * @see wp_oembed_remove_provider()
 270          *
 271          * @param string $format The format of URL that this provider can handle. You can use
 272          *                       asterisks as wildcards.
 273          */
 274         public static function _remove_provider_early( $format ) {
 275                 if ( empty( self::$early_providers['remove'] ) ) {
 276                         self::$early_providers['remove'] = array();
 277                 }
 278
 279                 self::$early_providers['remove'][] = $format;
 280         }
 281
 282         /**
 283          * The do-it-all function that takes a URL and attempts to return the HTML.
 284          *
 285          * @see WP_oEmbed::fetch()
 286          * @see WP_oEmbed::data2html()
 287          *
 288          * @param string $url The URL to the content that should be attempted to be embedded.
 289          * @param array $args Optional arguments. Usually passed from a shortcode.
 290          * @return false|string False on failure, otherwise the UNSANITIZED (and potentially unsafe) HTML that should be used to embed.
 291          */
 292         public function get_html( $url, $args = '' ) {
 293                 $provider = $this->get_provider( $url, $args );
 294
 295                 if ( !$provider || false === $data = $this->fetch( $provider, $url, $args ) )
 296                         return false;
 297
 298                 /**
 299                  * Filter the HTML returned by the oEmbed provider.
 300                  *
 301                  * @since 2.9.0
 302                  *
 303                  * @param string $data The returned oEmbed HTML.
 304                  * @param string $url  URL of the content to be embedded.
 305                  * @param array  $args Optional arguments, usually passed from a shortcode.
 306                  */
 307                 return apply_filters( 'oembed_result', $this->data2html( $data, $url ), $url, $args );
 308         }
 309
 310         /**
 311          * Attempts to discover link tags at the given URL for an oEmbed provider.
 312          *
 313          * @param string $url The URL that should be inspected for discovery `<link>` tags.
 314          * @return false|string False on failure, otherwise the oEmbed provider URL.
 315          */
 316         public function discover( $url ) {
 317                 $providers = array();
 318
 319                 /**
 320                  * Filter oEmbed remote get arguments.
 321                  *
 322                  * @since 4.0.0
 323                  *
 324                  * @see WP_Http::request()
 325                  *
 326                  * @param array  $args oEmbed remote get arguments.
 327                  * @param string $url  URL to be inspected.
 328                  */
 329                 $args = apply_filters( 'oembed_remote_get_args', array(), $url );
 330
 331                 // Fetch URL content
 332                 $request = wp_safe_remote_get( $url, $args );
 333                 if ( $html = wp_remote_retrieve_body( $request ) ) {
 334
 335                         /**
 336                          * Filter the link types that contain oEmbed provider URLs.
 337                          *
 338                          * @since 2.9.0
 339                          *
 340                          * @param array $format Array of oEmbed link types. Accepts 'application/json+oembed',
 341                          *                      'text/xml+oembed', and 'application/xml+oembed' (incorrect,
 342                          *                      used by at least Vimeo).
 343                          */
 344                         $linktypes = apply_filters( 'oembed_linktypes', array(
 345                                 'application/json+oembed' => 'json',
 346                                 'text/xml+oembed' => 'xml',
 347                                 'application/xml+oembed' => 'xml',
 348                         ) );
 349
 350                         // Strip <body>
 351                         $html = substr( $html, 0, stripos( $html, '</head>' ) );
 352
 353                         // Do a quick check
 354                         $tagfound = false;
 355                         foreach ( $linktypes as $linktype => $format ) {
 356                                 if ( stripos($html, $linktype) ) {
 357                                         $tagfound = true;
 358                                         break;
 359                                 }
 360                         }
 361
 362                         if ( $tagfound && preg_match_all( '#<link([^<>]+)/?>#iU', $html, $links ) ) {
 363                                 foreach ( $links[1] as $link ) {
 364                                         $atts = shortcode_parse_atts( $link );
 365
 366                                         if ( !empty($atts['type']) && !empty($linktypes[$atts['type']]) && !empty($atts['href']) ) {
 367                                                 $providers[$linktypes[$atts['type']]] = htmlspecialchars_decode( $atts['href'] );
 368
 369                                                 // Stop here if it's JSON (that's all we need)
 370                                                 if ( 'json' == $linktypes[$atts['type']] )
 371                                                         break;
 372                                         }
 373                                 }
 374                         }
 375                 }
 376
 377                 // JSON is preferred to XML
 378                 if ( !empty($providers['json']) )
 379                         return $providers['json'];
 380                 elseif ( !empty($providers['xml']) )
 381                         return $providers['xml'];
 382                 else
 383                         return false;
 384         }
 385
 386         /**
 387          * Connects to a oEmbed provider and returns the result.
 388          *
 389          * @param string $provider The URL to the oEmbed provider.
 390          * @param string $url The URL to the content that is desired to be embedded.
 391          * @param array $args Optional arguments. Usually passed from a shortcode.
 392          * @return false|object False on failure, otherwise the result in the form of an object.
 393          */
 394         public function fetch( $provider, $url, $args = '' ) {
 395                 $args = wp_parse_args( $args, wp_embed_defaults( $url ) );
 396
 397                 $provider = add_query_arg( 'maxwidth', (int) $args['width'], $provider );
 398                 $provider = add_query_arg( 'maxheight', (int) $args['height'], $provider );
 399                 $provider = add_query_arg( 'url', urlencode($url), $provider );
 400
 401                 /**
 402                  * Filter the oEmbed URL to be fetched.
 403                  *
 404                  * @since 2.9.0
 405                  *
 406                  * @param string $provider URL of the oEmbed provider.
 407                  * @param string $url      URL of the content to be embedded.
 408                  * @param array  $args     Optional arguments, usually passed from a shortcode.
 409                  */
 410                 $provider = apply_filters( 'oembed_fetch_url', $provider, $url, $args );
 411
 412                 foreach( array( 'json', 'xml' ) as $format ) {
 413                         $result = $this->_fetch_with_format( $provider, $format );
 414                         if ( is_wp_error( $result ) && 'not-implemented' == $result->get_error_code() )
 415                                 continue;
 416                         return ( $result && ! is_wp_error( $result ) ) ? $result : false;
 417                 }
 418                 return false;
 419         }
 420
 421         /**
 422          * Fetches result from an oEmbed provider for a specific format and complete provider URL
 423          *
 424          * @since 3.0.0
 425          * @access private
 426          * @param string $provider_url_with_args URL to the provider with full arguments list (url, maxheight, etc.)
 427          * @param string $format Format to use
 428          * @return false|object|WP_Error False on failure, otherwise the result in the form of an object.
 429          */
 430         private function _fetch_with_format( $provider_url_with_args, $format ) {
 431                 $provider_url_with_args = add_query_arg( 'format', $format, $provider_url_with_args );
 432
 433                 /** This filter is documented in wp-includes/class-oembed.php */
 434                 $args = apply_filters( 'oembed_remote_get_args', array(), $provider_url_with_args );
 435
 436                 $response = wp_safe_remote_get( $provider_url_with_args, $args );
 437                 if ( 501 == wp_remote_retrieve_response_code( $response ) )
 438                         return new WP_Error( 'not-implemented' );
 439                 if ( ! $body = wp_remote_retrieve_body( $response ) )
 440                         return false;
 441                 $parse_method = "_parse_$format";
 442                 return $this->$parse_method( $body );
 443         }
 444
 445         /**
 446          * Parses a json response body.
 447          *
 448          * @since 3.0.0
 449          * @access private
 450          *
 451          * @param string $response_body
 452          * @return object|false
 453          */
 454         private function _parse_json( $response_body ) {
 455                 $data = json_decode( trim( $response_body ) );
 456                 return ( $data && is_object( $data ) ) ? $data : false;
 457         }
 458
 459         /**
 460          * Parses an XML response body.
 461          *
 462          * @since 3.0.0
 463          * @access private
 464          *
 465          * @param string $response_body
 466          * @return object|false
 467          */
 468         private function _parse_xml( $response_body ) {
 469                 if ( ! function_exists( 'libxml_disable_entity_loader' ) )
 470                         return false;
 471
 472                 $loader = libxml_disable_entity_loader( true );
 473                 $errors = libxml_use_internal_errors( true );
 474
 475                 $return = $this->_parse_xml_body( $response_body );
 476
 477                 libxml_use_internal_errors( $errors );
 478                 libxml_disable_entity_loader( $loader );
 479
 480                 return $return;
 481         }
 482
 483         /**
 484          * Helper function for parsing an XML response body.
 485          *
 486          * @since 3.6.0
 487          * @access private
 488          *
 489          * @param string $response_body
 490          * @return object|false
 491          */
 492         private function _parse_xml_body( $response_body ) {
 493                 if ( ! function_exists( 'simplexml_import_dom' ) || ! class_exists( 'DOMDocument' ) )
 494                         return false;
 495
 496                 $dom = new DOMDocument;
 497                 $success = $dom->loadXML( $response_body );
 498                 if ( ! $success )
 499                         return false;
 500
 501                 if ( isset( $dom->doctype ) )
 502                         return false;
 503
 504                 foreach ( $dom->childNodes as $child ) {
 505                         if ( XML_DOCUMENT_TYPE_NODE === $child->nodeType )
 506                                 return false;
 507                 }
 508
 509                 $xml = simplexml_import_dom( $dom );
 510                 if ( ! $xml )
 511                         return false;
 512
 513                 $return = new stdClass;
 514                 foreach ( $xml as $key => $value ) {
 515                         $return->$key = (string) $value;
 516                 }
 517
 518                 return $return;
 519         }
 520
 521         /**
 522          * Converts a data object from {@link WP_oEmbed::fetch()} and returns the HTML.
 523          *
 524          * @param object $data A data object result from an oEmbed provider.
 525          * @param string $url The URL to the content that is desired to be embedded.
 526          * @return false|string False on error, otherwise the HTML needed to embed.
 527          */
 528         public function data2html( $data, $url ) {
 529                 if ( ! is_object( $data ) || empty( $data->type ) )
 530                         return false;
 531
 532                 $return = false;
 533
 534                 switch ( $data->type ) {
 535                         case 'photo':
 536                                 if ( empty( $data->url ) || empty( $data->width ) || empty( $data->height ) )
 537                                         break;
 538                                 if ( ! is_string( $data->url ) || ! is_numeric( $data->width ) || ! is_numeric( $data->height ) )
 539                                         break;
 540
 541                                 $title = ! empty( $data->title ) && is_string( $data->title ) ? $data->title : '';
 542                                 $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>';
 543                                 break;
 544
 545                         case 'video':
 546                         case 'rich':
 547                                 if ( ! empty( $data->html ) && is_string( $data->html ) )
 548                                         $return = $data->html;
 549                                 break;
 550
 551                         case 'link':
 552                                 if ( ! empty( $data->title ) && is_string( $data->title ) )
 553                                         $return = '<a href="' . esc_url( $url ) . '">' . esc_html( $data->title ) . '</a>';
 554                                 break;
 555
 556                         default:
 557                                 $return = false;
 558                 }
 559
 560                 /**
 561                  * Filter the returned oEmbed HTML.
 562                  *
 563                  * Use this filter to add support for custom data types, or to filter the result.
 564                  *
 565                  * @since 2.9.0
 566                  *
 567                  * @param string $return The returned oEmbed HTML.
 568                  * @param object $data   A data object result from an oEmbed provider.
 569                  * @param string $url    The URL of the content to be embedded.
 570                  */
 571                 return apply_filters( 'oembed_dataparse', $return, $data, $url );
 572         }
 573
 574         /**
 575          * Strip any new lines from the HTML.
 576          *
 577          * @access public
 578          * @param string $html Existing HTML.
 579          * @param object $data Data object from WP_oEmbed::data2html()
 580          * @param string $url The original URL passed to oEmbed.
 581          * @return string Possibly modified $html
 582          */
 583         public function _strip_newlines( $html, $data, $url ) {
 584                 if ( false === strpos( $html, "\n" ) ) {
 585                         return $html;
 586                 }
 587
 588                 $count = 1;
 589                 $found = array();
 590                 $token = '__PRE__';
 591                 $search = array( "\t", "\n", "\r", ' ' );
 592                 $replace = array( '__TAB__', '__NL__', '__CR__', '__SPACE__' );
 593                 $tokenized = str_replace( $search, $replace, $html );
 594
 595                 preg_match_all( '#(<pre[^>]*>.+?</pre>)#i', $tokenized, $matches, PREG_SET_ORDER );
 596                 foreach ( $matches as $i => $match ) {
 597                         $tag_html = str_replace( $replace, $search, $match[0] );
 598                         $tag_token = $token . $i;
 599
 600                         $found[ $tag_token ] = $tag_html;
 601                         $html = str_replace( $tag_html, $tag_token, $html, $count );
 602                 }
 603
 604                 $replaced = str_replace( $replace, $search, $html );
 605                 $stripped = str_replace( array( "\r\n", "\n" ), '', $replaced );
 606                 $pre = array_values( $found );
 607                 $tokens = array_keys( $found );
 608
 609                 return str_replace( $tokens, $pre, $stripped );
 610         }
 611 }
 612
 613 /**
 614  * Returns the initialized {@link WP_oEmbed} object
 615  *
 616  * @since 2.9.0
 617  * @access private
 618  *
 619  * @staticvar WP_oEmbed $wp_oembed
 620  *
 621  * @return WP_oEmbed object.
 622  */
 623 function _wp_oembed_get_object() {
 624         static $wp_oembed = null;
 625
 626         if ( is_null( $wp_oembed ) ) {
 627                 $wp_oembed = new WP_oEmbed();
 628         }
 629         return $wp_oembed;
 630 }