wp-includes/class-oembed.php

   1 <?php
   2 /**
   3  * API for fetching the HTML to embed remote content based on a provided URL
   4  *
   5  * Used internally by the WP_Embed class, but is designed to be generic.
   6  *
   7  * @link https://codex.wordpress.org/oEmbed oEmbed Codex Article
   8  * @link http://oembed.com/ oEmbed Homepage
   9  *
  10  * @package WordPress
  11  * @subpackage oEmbed
  12  */
  13
  14 /**
  15  * Core class used to implement oEmbed functionality.
  16  *
  17  * @since 2.9.0
  18  */
  19 class WP_oEmbed {
  20
  21         /**
  22          * A list of oEmbed providers.
  23          *
  24          * @since 2.9.0
  25          * @access public
  26          * @var array
  27          */
  28         public $providers = array();
  29
  30         /**
  31          * A list of an early oEmbed providers.
  32          *
  33          * @since 4.0.0
  34          * @access public
  35          * @static
  36          * @var array
  37          */
  38         public static $early_providers = array();
  39
  40         /**
  41          * A list of private/protected methods, used for backward compatibility.
  42          *
  43          * @since 4.2.0
  44          * @access private
  45          * @var array
  46          */
  47         private $compat_methods = array( '_fetch_with_format', '_parse_json', '_parse_xml', '_parse_body' );
  48
  49         /**
  50          * Constructor.
  51          *
  52          * @since 2.9.0
  53          * @access public
  54          */
  55         public function __construct() {
  56                 $host = urlencode( home_url() );
  57                 $providers = array(
  58                         '#https?://((m|www)\.)?youtube\.com/watch.*#i'             => array( 'https://www.youtube.com/oembed',                            true  ),
  59                         '#https?://((m|www)\.)?youtube\.com/playlist.*#i'          => array( 'https://www.youtube.com/oembed',                            true  ),
  60                         '#https?://youtu\.be/.*#i'                                 => array( 'https://www.youtube.com/oembed',                            true  ),
  61                         '#https?://(.+\.)?vimeo\.com/.*#i'                         => array( 'https://vimeo.com/api/oembed.{format}',                     true  ),
  62                         '#https?://(www\.)?dailymotion\.com/.*#i'                  => array( 'https://www.dailymotion.com/services/oembed',               true  ),
  63                         '#https?://dai\.ly/.*#i'                                   => array( 'https://www.dailymotion.com/services/oembed',               true  ),
  64                         '#https?://(www\.)?flickr\.com/.*#i'                       => array( 'https://www.flickr.com/services/oembed/',                   true  ),
  65                         '#https?://flic\.kr/.*#i'                                  => array( 'https://www.flickr.com/services/oembed/',                   true  ),
  66                         '#https?://(.+\.)?smugmug\.com/.*#i'                       => array( 'https://api.smugmug.com/services/oembed/',                  true  ),
  67                         '#https?://(www\.)?hulu\.com/watch/.*#i'                   => array( 'http://www.hulu.com/api/oembed.{format}',                   true  ),
  68                         'http://i*.photobucket.com/albums/*'                       => array( 'http://api.photobucket.com/oembed',                         false ),
  69                         'http://gi*.photobucket.com/groups/*'                      => array( 'http://api.photobucket.com/oembed',                         false ),
  70                         '#https?://(www\.)?scribd\.com/doc/.*#i'                   => array( 'https://www.scribd.com/services/oembed',                    true  ),
  71                         '#https?://wordpress\.tv/.*#i'                             => array( 'https://wordpress.tv/oembed/',                              true  ),
  72                         '#https?://(.+\.)?polldaddy\.com/.*#i'                     => array( 'https://polldaddy.com/oembed/',                             true  ),
  73                         '#https?://poll\.fm/.*#i'                                  => array( 'https://polldaddy.com/oembed/',                             true  ),
  74                         '#https?://(www\.)?funnyordie\.com/videos/.*#i'            => array( 'http://www.funnyordie.com/oembed',                          true  ),
  75                         '#https?://(www\.)?twitter\.com/\w{1,15}/status(es)?/.*#i' => array( 'https://publish.twitter.com/oembed',                        true  ),
  76                         '#https?://(www\.)?twitter\.com/\w{1,15}$#i'               => array( 'https://publish.twitter.com/oembed',                        true  ),
  77                         '#https?://(www\.)?twitter\.com/\w{1,15}/likes$#i'         => array( 'https://publish.twitter.com/oembed',                        true  ),
  78                         '#https?://(www\.)?twitter\.com/\w{1,15}/lists/.*#i'       => array( 'https://publish.twitter.com/oembed',                        true  ),
  79                         '#https?://(www\.)?twitter\.com/\w{1,15}/timelines/.*#i'   => array( 'https://publish.twitter.com/oembed',                        true  ),
  80                         '#https?://(www\.)?twitter\.com/i/moments/.*#i'            => array( 'https://publish.twitter.com/oembed',                        true  ),
  81                         '#https?://vine\.co/v/.*#i'                                => array( 'https://vine.co/oembed.{format}',                           true  ),
  82                         '#https?://(www\.)?soundcloud\.com/.*#i'                   => array( 'https://soundcloud.com/oembed',                             true  ),
  83                         '#https?://(.+?\.)?slideshare\.net/.*#i'                   => array( 'https://www.slideshare.net/api/oembed/2',                   true  ),
  84                         '#https?://(www\.)?instagr(\.am|am\.com)/p/.*#i'           => array( 'https://api.instagram.com/oembed',                          true  ),
  85                         '#https?://(open|play)\.spotify\.com/.*#i'                 => array( 'https://embed.spotify.com/oembed/',                         true  ),
  86                         '#https?://(.+\.)?imgur\.com/.*#i'                         => array( 'http://api.imgur.com/oembed',                               true  ),
  87                         '#https?://(www\.)?meetu(\.ps|p\.com)/.*#i'                => array( 'https://api.meetup.com/oembed',                             true  ),
  88                         '#https?://(www\.)?issuu\.com/.+/docs/.+#i'                => array( 'https://issuu.com/oembed_wp',                               true  ),
  89                         '#https?://(www\.)?collegehumor\.com/video/.*#i'           => array( 'http://www.collegehumor.com/oembed.{format}',               true  ),
  90                         '#https?://(www\.)?mixcloud\.com/.*#i'                     => array( 'https://www.mixcloud.com/oembed',                           true  ),
  91                         '#https?://(www\.|embed\.)?ted\.com/talks/.*#i'            => array( 'https://www.ted.com/services/v1/oembed.{format}',           true  ),
  92                         '#https?://(www\.)?(animoto|video214)\.com/play/.*#i'      => array( 'https://animoto.com/oembeds/create',                        true  ),
  93                         '#https?://(.+)\.tumblr\.com/post/.*#i'                    => array( 'https://www.tumblr.com/oembed/1.0',                         true  ),
  94                         '#https?://(www\.)?kickstarter\.com/projects/.*#i'         => array( 'https://www.kickstarter.com/services/oembed',               true  ),
  95                         '#https?://kck\.st/.*#i'                                   => array( 'https://www.kickstarter.com/services/oembed',               true  ),
  96                         '#https?://cloudup\.com/.*#i'                              => array( 'https://cloudup.com/oembed',                                true  ),
  97                         '#https?://(www\.)?reverbnation\.com/.*#i'                 => array( 'https://www.reverbnation.com/oembed',                       true  ),
  98                         '#https?://videopress\.com/v/.*#'                          => array( 'https://public-api.wordpress.com/oembed/1.0/?for=' . $host, true  ),
  99                         '#https?://(www\.)?reddit\.com/r/[^/]+/comments/.*#i'      => array( 'https://www.reddit.com/oembed',                             true  ),
 100                         '#https?://(www\.)?speakerdeck\.com/.*#i'                  => array( 'https://speakerdeck.com/oembed.{format}',                   true  ),
 101                         '#https?://www\.facebook\.com/.*/posts/.*#i'               => array( 'https://www.facebook.com/plugins/post/oembed.json/',        true  ),
 102                         '#https?://www\.facebook\.com/.*/activity/.*#i'            => array( 'https://www.facebook.com/plugins/post/oembed.json/',        true  ),
 103                         '#https?://www\.facebook\.com/.*/photos/.*#i'              => array( 'https://www.facebook.com/plugins/post/oembed.json/',        true  ),
 104                         '#https?://www\.facebook\.com/photo(s/|\.php).*#i'         => array( 'https://www.facebook.com/plugins/post/oembed.json/',        true  ),
 105                         '#https?://www\.facebook\.com/permalink\.php.*#i'          => array( 'https://www.facebook.com/plugins/post/oembed.json/',        true  ),
 106                         '#https?://www\.facebook\.com/media/.*#i'                  => array( 'https://www.facebook.com/plugins/post/oembed.json/',        true  ),
 107                         '#https?://www\.facebook\.com/questions/.*#i'              => array( 'https://www.facebook.com/plugins/post/oembed.json/',        true  ),
 108                         '#https?://www\.facebook\.com/notes/.*#i'                  => array( 'https://www.facebook.com/plugins/post/oembed.json/',        true  ),
 109                         '#https?://www\.facebook\.com/.*/videos/.*#i'              => array( 'https://www.facebook.com/plugins/video/oembed.json/',       true  ),
 110                         '#https?://www\.facebook\.com/video\.php.*#i'              => array( 'https://www.facebook.com/plugins/video/oembed.json/',       true  ),
 111                 );
 112
 113                 if ( ! empty( self::$early_providers['add'] ) ) {
 114                         foreach ( self::$early_providers['add'] as $format => $data ) {
 115                                 $providers[ $format ] = $data;
 116                         }
 117                 }
 118
 119                 if ( ! empty( self::$early_providers['remove'] ) ) {
 120                         foreach ( self::$early_providers['remove'] as $format ) {
 121                                 unset( $providers[ $format ] );
 122                         }
 123                 }
 124
 125                 self::$early_providers = array();
 126
 127                 /**
 128                  * Filters the list of whitelisted oEmbed providers.
 129                  *
 130                  * Since WordPress 4.4, oEmbed discovery is enabled for all users and allows embedding of sanitized
 131                  * iframes. The providers in this list are whitelisted, meaning they are trusted and allowed to
 132                  * embed any content, such as iframes, videos, JavaScript, and arbitrary HTML.
 133                  *
 134                  * Supported providers:
 135                  *
 136                  * |   Provider   |        Flavor         | Supports HTTPS |   Since   |
 137                  * | ------------ | --------------------- | :------------: | --------- |
 138                  * | Dailymotion  | dailymotion.com       |      Yes       | 2.9.0     |
 139                  * | Flickr       | flickr.com            |      Yes       | 2.9.0     |
 140                  * | Hulu         | hulu.com              |      Yes       | 2.9.0     |
 141                  * | Photobucket  | photobucket.com       |      No        | 2.9.0     |
 142                  * | Scribd       | scribd.com            |      Yes       | 2.9.0     |
 143                  * | Vimeo        | vimeo.com             |      Yes       | 2.9.0     |
 144                  * | WordPress.tv | wordpress.tv          |      Yes       | 2.9.0     |
 145                  * | YouTube      | youtube.com/watch     |      Yes       | 2.9.0     |
 146                  * | Funny or Die | funnyordie.com        |      Yes       | 3.0.0     |
 147                  * | Polldaddy    | polldaddy.com         |      Yes       | 3.0.0     |
 148                  * | SmugMug      | smugmug.com           |      Yes       | 3.0.0     |
 149                  * | YouTube      | youtu.be              |      Yes       | 3.0.0     |
 150                  * | Twitter      | twitter.com           |      Yes       | 3.4.0     |
 151                  * | Instagram    | instagram.com         |      Yes       | 3.5.0     |
 152                  * | Instagram    | instagr.am            |      Yes       | 3.5.0     |
 153                  * | Slideshare   | slideshare.net        |      Yes       | 3.5.0     |
 154                  * | SoundCloud   | soundcloud.com        |      Yes       | 3.5.0     |
 155                  * | Dailymotion  | dai.ly                |      Yes       | 3.6.0     |
 156                  * | Flickr       | flic.kr               |      Yes       | 3.6.0     |
 157                  * | Spotify      | spotify.com           |      Yes       | 3.6.0     |
 158                  * | Imgur        | imgur.com             |      Yes       | 3.9.0     |
 159                  * | Meetup.com   | meetup.com            |      Yes       | 3.9.0     |
 160                  * | Meetup.com   | meetu.ps              |      Yes       | 3.9.0     |
 161                  * | Animoto      | animoto.com           |      Yes       | 4.0.0     |
 162                  * | Animoto      | video214.com          |      Yes       | 4.0.0     |
 163                  * | CollegeHumor | collegehumor.com      |      Yes       | 4.0.0     |
 164                  * | Issuu        | issuu.com             |      Yes       | 4.0.0     |
 165                  * | Mixcloud     | mixcloud.com          |      Yes       | 4.0.0     |
 166                  * | Polldaddy    | poll.fm               |      Yes       | 4.0.0     |
 167                  * | TED          | ted.com               |      Yes       | 4.0.0     |
 168                  * | YouTube      | youtube.com/playlist  |      Yes       | 4.0.0     |
 169                  * | Vine         | vine.co               |      Yes       | 4.1.0     |
 170                  * | Tumblr       | tumblr.com            |      Yes       | 4.2.0     |
 171                  * | Kickstarter  | kickstarter.com       |      Yes       | 4.2.0     |
 172                  * | Kickstarter  | kck.st                |      Yes       | 4.2.0     |
 173                  * | Cloudup      | cloudup.com           |      Yes       | 4.3.0     |
 174                  * | ReverbNation | reverbnation.com      |      Yes       | 4.4.0     |
 175                  * | VideoPress   | videopress.com        |      Yes       | 4.4.0     |
 176                  * | Reddit       | reddit.com            |      Yes       | 4.4.0     |
 177                  * | Speaker Deck | speakerdeck.com       |      Yes       | 4.4.0     |
 178                  * | Twitter      | twitter.com/timelines |      Yes       | 4.5.0     |
 179                  * | Twitter      | twitter.com/moments   |      Yes       | 4.5.0     |
 180                  * | Facebook     | facebook.com          |      Yes       | 4.7.0     |
 181                  * | Twitter      | twitter.com/user      |      Yes       | 4.7.0     |
 182                  * | Twitter      | twitter.com/likes     |      Yes       | 4.7.0     |
 183                  * | Twitter      | twitter.com/lists     |      Yes       | 4.7.0     |
 184                  *
 185                  * No longer supported providers:
 186                  *
 187                  * |   Provider   |        Flavor        | Supports HTTPS |   Since   |  Removed  |
 188                  * | ------------ | -------------------- | :------------: | --------- | --------- |
 189                  * | Qik          | qik.com              |      Yes       | 2.9.0     | 3.9.0     |
 190                  * | Viddler      | viddler.com          |      Yes       | 2.9.0     | 4.0.0     |
 191                  * | Revision3    | revision3.com        |      No        | 2.9.0     | 4.2.0     |
 192                  * | Blip         | blip.tv              |      No        | 2.9.0     | 4.4.0     |
 193                  * | Rdio         | rdio.com             |      Yes       | 3.6.0     | 4.4.1     |
 194                  * | Rdio         | rd.io                |      Yes       | 3.6.0     | 4.4.1     |
 195                  *
 196                  * @see wp_oembed_add_provider()
 197                  *
 198                  * @since 2.9.0
 199                  *
 200                  * @param array $providers An array of popular oEmbed providers.
 201                  */
 202                 $this->providers = apply_filters( 'oembed_providers', $providers );
 203
 204                 // Fix any embeds that contain new lines in the middle of the HTML which breaks wpautop().
 205                 add_filter( 'oembed_dataparse', array($this, '_strip_newlines'), 10, 3 );
 206         }
 207
 208         /**
 209          * Exposes private/protected methods for backward compatibility.
 210          *
 211          * @since 4.0.0
 212          * @access public
 213          *
 214          * @param callable $name      Method to call.
 215          * @param array    $arguments Arguments to pass when calling.
 216          * @return mixed|bool Return value of the callback, false otherwise.
 217          */
 218         public function __call( $name, $arguments ) {
 219                 if ( in_array( $name, $this->compat_methods ) ) {
 220                         return call_user_func_array( array( $this, $name ), $arguments );
 221                 }
 222                 return false;
 223         }
 224
 225         /**
 226          * Takes a URL and returns the corresponding oEmbed provider's URL, if there is one.
 227          *
 228          * @since 4.0.0
 229          * @access public
 230          *
 231          * @see WP_oEmbed::discover()
 232          *
 233          * @param string        $url  The URL to the content.
 234          * @param string|array  $args Optional provider arguments.
 235          * @return false|string False on failure, otherwise the oEmbed provider URL.
 236          */
 237         public function get_provider( $url, $args = '' ) {
 238                 $args = wp_parse_args( $args );
 239
 240                 $provider = false;
 241
 242                 if ( !isset($args['discover']) )
 243                         $args['discover'] = true;
 244
 245                 foreach ( $this->providers as $matchmask => $data ) {
 246                         list( $providerurl, $regex ) = $data;
 247
 248                         // Turn the asterisk-type provider URLs into regex
 249                         if ( !$regex ) {
 250                                 $matchmask = '#' . str_replace( '___wildcard___', '(.+)', preg_quote( str_replace( '*', '___wildcard___', $matchmask ), '#' ) ) . '#i';
 251                                 $matchmask = preg_replace( '|^#http\\\://|', '#https?\://', $matchmask );
 252                         }
 253
 254                         if ( preg_match( $matchmask, $url ) ) {
 255                                 $provider = str_replace( '{format}', 'json', $providerurl ); // JSON is easier to deal with than XML
 256                                 break;
 257                         }
 258                 }
 259
 260                 if ( !$provider && $args['discover'] )
 261                         $provider = $this->discover( $url );
 262
 263                 return $provider;
 264         }
 265
 266         /**
 267          * Adds an oEmbed provider.
 268          *
 269          * The provider is added just-in-time when wp_oembed_add_provider() is called before
 270          * the {@see 'plugins_loaded'} hook.
 271          *
 272          * The just-in-time addition is for the benefit of the {@see 'oembed_providers'} filter.
 273          *
 274          * @static
 275          * @since 4.0.0
 276          * @access public
 277          *
 278          * @see wp_oembed_add_provider()
 279          *
 280          * @param string $format   Format of URL that this provider can handle. You can use
 281          *                         asterisks as wildcards.
 282          * @param string $provider The URL to the oEmbed provider..
 283          * @param bool   $regex    Optional. Whether the $format parameter is in a regex format.
 284          *                         Default false.
 285          */
 286         public static function _add_provider_early( $format, $provider, $regex = false ) {
 287                 if ( empty( self::$early_providers['add'] ) ) {
 288                         self::$early_providers['add'] = array();
 289                 }
 290
 291                 self::$early_providers['add'][ $format ] = array( $provider, $regex );
 292         }
 293
 294         /**
 295          * Removes an oEmbed provider.
 296          *
 297          * The provider is removed just-in-time when wp_oembed_remove_provider() is called before
 298          * the {@see 'plugins_loaded'} hook.
 299          *
 300          * The just-in-time removal is for the benefit of the {@see 'oembed_providers'} filter.
 301          *
 302          * @since 4.0.0
 303          * @access public
 304          * @static
 305          *
 306          * @see wp_oembed_remove_provider()
 307          *
 308          * @param string $format The format of URL that this provider can handle. You can use
 309          *                       asterisks as wildcards.
 310          */
 311         public static function _remove_provider_early( $format ) {
 312                 if ( empty( self::$early_providers['remove'] ) ) {
 313                         self::$early_providers['remove'] = array();
 314                 }
 315
 316                 self::$early_providers['remove'][] = $format;
 317         }
 318
 319         /**
 320          * The do-it-all function that takes a URL and attempts to return the HTML.
 321          *
 322          * @see WP_oEmbed::fetch()
 323          * @see WP_oEmbed::data2html()
 324          *
 325          * @since 2.9.0
 326          * @access public
 327          *
 328          * @param string       $url  The URL to the content that should be attempted to be embedded.
 329          * @param array|string $args Optional. Arguments, usually passed from a shortcode. Default empty.
 330          * @return false|string False on failure, otherwise the UNSANITIZED (and potentially unsafe) HTML that should be used to embed.
 331          */
 332         public function get_html( $url, $args = '' ) {
 333                 $args = wp_parse_args( $args );
 334
 335                 /**
 336                  * Filters the oEmbed result before any HTTP requests are made.
 337                  *
 338                  * This allows one to short-circuit the default logic, perhaps by
 339                  * replacing it with a routine that is more optimal for your setup.
 340                  *
 341                  * Passing a non-null value to the filter will effectively short-circuit retrieval,
 342                  * returning the passed value instead.
 343                  *
 344                  * @since 4.5.3
 345                  *
 346                  * @param null|string $result The UNSANITIZED (and potentially unsafe) HTML that should be used to embed. Default null.
 347                  * @param string      $url    The URL to the content that should be attempted to be embedded.
 348                  * @param array       $args   Optional. Arguments, usually passed from a shortcode. Default empty.
 349                  */
 350                 $pre = apply_filters( 'pre_oembed_result', null, $url, $args );
 351
 352                 if ( null !== $pre ) {
 353                         return $pre;
 354                 }
 355
 356                 $provider = $this->get_provider( $url, $args );
 357
 358                 if ( ! $provider || false === $data = $this->fetch( $provider, $url, $args ) ) {
 359                         return false;
 360                 }
 361
 362                 /**
 363                  * Filters the HTML returned by the oEmbed provider.
 364                  *
 365                  * @since 2.9.0
 366                  *
 367                  * @param string $data The returned oEmbed HTML.
 368                  * @param string $url  URL of the content to be embedded.
 369                  * @param array  $args Optional arguments, usually passed from a shortcode.
 370                  */
 371                 return apply_filters( 'oembed_result', $this->data2html( $data, $url ), $url, $args );
 372         }
 373
 374         /**
 375          * Attempts to discover link tags at the given URL for an oEmbed provider.
 376          *
 377          * @since 2.9.0
 378          * @access public
 379          *
 380          * @param string $url The URL that should be inspected for discovery `<link>` tags.
 381          * @return false|string False on failure, otherwise the oEmbed provider URL.
 382          */
 383         public function discover( $url ) {
 384                 $providers = array();
 385                 $args = array(
 386                         'limit_response_size' => 153600, // 150 KB
 387                 );
 388
 389                 /**
 390                  * Filters oEmbed remote get arguments.
 391                  *
 392                  * @since 4.0.0
 393                  *
 394                  * @see WP_Http::request()
 395                  *
 396                  * @param array  $args oEmbed remote get arguments.
 397                  * @param string $url  URL to be inspected.
 398                  */
 399                 $args = apply_filters( 'oembed_remote_get_args', $args, $url );
 400
 401                 // Fetch URL content
 402                 $request = wp_safe_remote_get( $url, $args );
 403                 if ( $html = wp_remote_retrieve_body( $request ) ) {
 404
 405                         /**
 406                          * Filters the link types that contain oEmbed provider URLs.
 407                          *
 408                          * @since 2.9.0
 409                          *
 410                          * @param array $format Array of oEmbed link types. Accepts 'application/json+oembed',
 411                          *                      'text/xml+oembed', and 'application/xml+oembed' (incorrect,
 412                          *                      used by at least Vimeo).
 413                          */
 414                         $linktypes = apply_filters( 'oembed_linktypes', array(
 415                                 'application/json+oembed' => 'json',
 416                                 'text/xml+oembed' => 'xml',
 417                                 'application/xml+oembed' => 'xml',
 418                         ) );
 419
 420                         // Strip <body>
 421                         if ( $html_head_end = stripos( $html, '</head>' ) ) {
 422                                 $html = substr( $html, 0, $html_head_end );
 423                         }
 424
 425                         // Do a quick check
 426                         $tagfound = false;
 427                         foreach ( $linktypes as $linktype => $format ) {
 428                                 if ( stripos($html, $linktype) ) {
 429                                         $tagfound = true;
 430                                         break;
 431                                 }
 432                         }
 433
 434                         if ( $tagfound && preg_match_all( '#<link([^<>]+)/?>#iU', $html, $links ) ) {
 435                                 foreach ( $links[1] as $link ) {
 436                                         $atts = shortcode_parse_atts( $link );
 437
 438                                         if ( !empty($atts['type']) && !empty($linktypes[$atts['type']]) && !empty($atts['href']) ) {
 439                                                 $providers[$linktypes[$atts['type']]] = htmlspecialchars_decode( $atts['href'] );
 440
 441                                                 // Stop here if it's JSON (that's all we need)
 442                                                 if ( 'json' == $linktypes[$atts['type']] )
 443                                                         break;
 444                                         }
 445                                 }
 446                         }
 447                 }
 448
 449                 // JSON is preferred to XML
 450                 if ( !empty($providers['json']) )
 451                         return $providers['json'];
 452                 elseif ( !empty($providers['xml']) )
 453                         return $providers['xml'];
 454                 else
 455                         return false;
 456         }
 457
 458         /**
 459          * Connects to a oEmbed provider and returns the result.
 460          *
 461          * @since 2.9.0
 462          * @access public
 463          *
 464          * @param string       $provider The URL to the oEmbed provider.
 465          * @param string       $url      The URL to the content that is desired to be embedded.
 466          * @param array|string $args     Optional. Arguments, usually passed from a shortcode. Default empty.
 467          * @return false|object False on failure, otherwise the result in the form of an object.
 468          */
 469         public function fetch( $provider, $url, $args = '' ) {
 470                 $args = wp_parse_args( $args, wp_embed_defaults( $url ) );
 471
 472                 $provider = add_query_arg( 'maxwidth', (int) $args['width'], $provider );
 473                 $provider = add_query_arg( 'maxheight', (int) $args['height'], $provider );
 474                 $provider = add_query_arg( 'url', urlencode($url), $provider );
 475
 476                 /**
 477                  * Filters the oEmbed URL to be fetched.
 478                  *
 479                  * @since 2.9.0
 480                  *
 481                  * @param string $provider URL of the oEmbed provider.
 482                  * @param string $url      URL of the content to be embedded.
 483                  * @param array  $args     Optional arguments, usually passed from a shortcode.
 484                  */
 485                 $provider = apply_filters( 'oembed_fetch_url', $provider, $url, $args );
 486
 487                 foreach ( array( 'json', 'xml' ) as $format ) {
 488                         $result = $this->_fetch_with_format( $provider, $format );
 489                         if ( is_wp_error( $result ) && 'not-implemented' == $result->get_error_code() )
 490                                 continue;
 491                         return ( $result && ! is_wp_error( $result ) ) ? $result : false;
 492                 }
 493                 return false;
 494         }
 495
 496         /**
 497          * Fetches result from an oEmbed provider for a specific format and complete provider URL
 498          *
 499          * @since 3.0.0
 500          * @access private
 501          *
 502          * @param string $provider_url_with_args URL to the provider with full arguments list (url, maxheight, etc.)
 503          * @param string $format Format to use
 504          * @return false|object|WP_Error False on failure, otherwise the result in the form of an object.
 505          */
 506         private function _fetch_with_format( $provider_url_with_args, $format ) {
 507                 $provider_url_with_args = add_query_arg( 'format', $format, $provider_url_with_args );
 508
 509                 /** This filter is documented in wp-includes/class-oembed.php */
 510                 $args = apply_filters( 'oembed_remote_get_args', array(), $provider_url_with_args );
 511
 512                 $response = wp_safe_remote_get( $provider_url_with_args, $args );
 513                 if ( 501 == wp_remote_retrieve_response_code( $response ) )
 514                         return new WP_Error( 'not-implemented' );
 515                 if ( ! $body = wp_remote_retrieve_body( $response ) )
 516                         return false;
 517                 $parse_method = "_parse_$format";
 518                 return $this->$parse_method( $body );
 519         }
 520
 521         /**
 522          * Parses a json response body.
 523          *
 524          * @since 3.0.0
 525          * @access private
 526          *
 527          * @param string $response_body
 528          * @return object|false
 529          */
 530         private function _parse_json( $response_body ) {
 531                 $data = json_decode( trim( $response_body ) );
 532                 return ( $data && is_object( $data ) ) ? $data : false;
 533         }
 534
 535         /**
 536          * Parses an XML response body.
 537          *
 538          * @since 3.0.0
 539          * @access private
 540          *
 541          * @param string $response_body
 542          * @return object|false
 543          */
 544         private function _parse_xml( $response_body ) {
 545                 if ( ! function_exists( 'libxml_disable_entity_loader' ) )
 546                         return false;
 547
 548                 $loader = libxml_disable_entity_loader( true );
 549                 $errors = libxml_use_internal_errors( true );
 550
 551                 $return = $this->_parse_xml_body( $response_body );
 552
 553                 libxml_use_internal_errors( $errors );
 554                 libxml_disable_entity_loader( $loader );
 555
 556                 return $return;
 557         }
 558
 559         /**
 560          * Serves as a helper function for parsing an XML response body.
 561          *
 562          * @since 3.6.0
 563          * @access private
 564          *
 565          * @param string $response_body
 566          * @return stdClass|false
 567          */
 568         private function _parse_xml_body( $response_body ) {
 569                 if ( ! function_exists( 'simplexml_import_dom' ) || ! class_exists( 'DOMDocument', false ) )
 570                         return false;
 571
 572                 $dom = new DOMDocument;
 573                 $success = $dom->loadXML( $response_body );
 574                 if ( ! $success )
 575                         return false;
 576
 577                 if ( isset( $dom->doctype ) )
 578                         return false;
 579
 580                 foreach ( $dom->childNodes as $child ) {
 581                         if ( XML_DOCUMENT_TYPE_NODE === $child->nodeType )
 582                                 return false;
 583                 }
 584
 585                 $xml = simplexml_import_dom( $dom );
 586                 if ( ! $xml )
 587                         return false;
 588
 589                 $return = new stdClass;
 590                 foreach ( $xml as $key => $value ) {
 591                         $return->$key = (string) $value;
 592                 }
 593
 594                 return $return;
 595         }
 596
 597         /**
 598          * Converts a data object from WP_oEmbed::fetch() and returns the HTML.
 599          *
 600          * @since 2.9.0
 601          * @access public
 602          *
 603          * @param object $data A data object result from an oEmbed provider.
 604          * @param string $url The URL to the content that is desired to be embedded.
 605          * @return false|string False on error, otherwise the HTML needed to embed.
 606          */
 607         public function data2html( $data, $url ) {
 608                 if ( ! is_object( $data ) || empty( $data->type ) )
 609                         return false;
 610
 611                 $return = false;
 612
 613                 switch ( $data->type ) {
 614                         case 'photo':
 615                                 if ( empty( $data->url ) || empty( $data->width ) || empty( $data->height ) )
 616                                         break;
 617                                 if ( ! is_string( $data->url ) || ! is_numeric( $data->width ) || ! is_numeric( $data->height ) )
 618                                         break;
 619
 620                                 $title = ! empty( $data->title ) && is_string( $data->title ) ? $data->title : '';
 621                                 $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>';
 622                                 break;
 623
 624                         case 'video':
 625                         case 'rich':
 626                                 if ( ! empty( $data->html ) && is_string( $data->html ) )
 627                                         $return = $data->html;
 628                                 break;
 629
 630                         case 'link':
 631                                 if ( ! empty( $data->title ) && is_string( $data->title ) )
 632                                         $return = '<a href="' . esc_url( $url ) . '">' . esc_html( $data->title ) . '</a>';
 633                                 break;
 634
 635                         default:
 636                                 $return = false;
 637                 }
 638
 639                 /**
 640                  * Filters the returned oEmbed HTML.
 641                  *
 642                  * Use this filter to add support for custom data types, or to filter the result.
 643                  *
 644                  * @since 2.9.0
 645                  *
 646                  * @param string $return The returned oEmbed HTML.
 647                  * @param object $data   A data object result from an oEmbed provider.
 648                  * @param string $url    The URL of the content to be embedded.
 649                  */
 650                 return apply_filters( 'oembed_dataparse', $return, $data, $url );
 651         }
 652
 653         /**
 654          * Strips any new lines from the HTML.
 655          *
 656          * @since 2.9.0 as strip_scribd_newlines()
 657          * @since 3.0.0
 658          * @access public
 659          *
 660          * @param string $html Existing HTML.
 661          * @param object $data Data object from WP_oEmbed::data2html()
 662          * @param string $url The original URL passed to oEmbed.
 663          * @return string Possibly modified $html
 664          */
 665         public function _strip_newlines( $html, $data, $url ) {
 666                 if ( false === strpos( $html, "\n" ) ) {
 667                         return $html;
 668                 }
 669
 670                 $count = 1;
 671                 $found = array();
 672                 $token = '__PRE__';
 673                 $search = array( "\t", "\n", "\r", ' ' );
 674                 $replace = array( '__TAB__', '__NL__', '__CR__', '__SPACE__' );
 675                 $tokenized = str_replace( $search, $replace, $html );
 676
 677                 preg_match_all( '#(<pre[^>]*>.+?</pre>)#i', $tokenized, $matches, PREG_SET_ORDER );
 678                 foreach ( $matches as $i => $match ) {
 679                         $tag_html = str_replace( $replace, $search, $match[0] );
 680                         $tag_token = $token . $i;
 681
 682                         $found[ $tag_token ] = $tag_html;
 683                         $html = str_replace( $tag_html, $tag_token, $html, $count );
 684                 }
 685
 686                 $replaced = str_replace( $replace, $search, $html );
 687                 $stripped = str_replace( array( "\r\n", "\n" ), '', $replaced );
 688                 $pre = array_values( $found );
 689                 $tokens = array_keys( $found );
 690
 691                 return str_replace( $tokens, $pre, $stripped );
 692         }
 693 }