WordPress 4.0
[autoinstalls/wordpress.git] / wp-includes / class-oembed.php
1 <?php
2 /**
3  * API for fetching the HTML to embed remote content based on a provided URL.
4  * Used internally by the {@link WP_Embed} class, but is designed to be generic.
5  *
6  * @link http://codex.wordpress.org/oEmbed oEmbed Codex Article
7  * @link http://oembed.com/ oEmbed Homepage
8  *
9  * @package WordPress
10  * @subpackage oEmbed
11  */
12
13 /**
14  * oEmbed class.
15  *
16  * @package WordPress
17  * @subpackage oEmbed
18  * @since 2.9.0
19  */
20 class WP_oEmbed {
21         public $providers = array();
22         public static $early_providers = array();
23
24         /**
25          * Constructor
26          *
27          * @since 2.9.0
28          */
29         public function __construct() {
30                 $providers = array(
31                         '#http://(www\.)?youtube\.com/watch.*#i'              => array( 'http://www.youtube.com/oembed',                      true  ),
32                         '#https://(www\.)?youtube\.com/watch.*#i'             => array( 'http://www.youtube.com/oembed?scheme=https',         true  ),
33                         '#http://(www\.)?youtube\.com/playlist.*#i'           => array( 'http://www.youtube.com/oembed',                      true  ),
34                         '#https://(www\.)?youtube\.com/playlist.*#i'          => array( 'http://www.youtube.com/oembed?scheme=https',         true  ),
35                         '#http://youtu\.be/.*#i'                              => array( 'http://www.youtube.com/oembed',                      true  ),
36                         '#https://youtu\.be/.*#i'                             => array( 'http://www.youtube.com/oembed?scheme=https',         true  ),
37                         'http://blip.tv/*'                                    => array( 'http://blip.tv/oembed/',                             false ),
38                         '#https?://(.+\.)?vimeo\.com/.*#i'                    => array( 'http://vimeo.com/api/oembed.{format}',               true  ),
39                         '#https?://(www\.)?dailymotion\.com/.*#i'             => array( 'http://www.dailymotion.com/services/oembed',         true  ),
40                         'http://dai.ly/*'                                     => array( 'http://www.dailymotion.com/services/oembed',         false ),
41                         '#https?://(www\.)?flickr\.com/.*#i'                  => array( 'https://www.flickr.com/services/oembed/',            true  ),
42                         '#https?://flic\.kr/.*#i'                             => array( 'https://www.flickr.com/services/oembed/',            true  ),
43                         '#https?://(.+\.)?smugmug\.com/.*#i'                  => array( 'http://api.smugmug.com/services/oembed/',            true  ),
44                         '#https?://(www\.)?hulu\.com/watch/.*#i'              => array( 'http://www.hulu.com/api/oembed.{format}',            true  ),
45                         'http://revision3.com/*'                              => array( 'http://revision3.com/api/oembed/',                   false ),
46                         'http://i*.photobucket.com/albums/*'                  => array( 'http://photobucket.com/oembed',                      false ),
47                         'http://gi*.photobucket.com/groups/*'                 => array( 'http://photobucket.com/oembed',                      false ),
48                         '#https?://(www\.)?scribd\.com/doc/.*#i'              => array( 'http://www.scribd.com/services/oembed',              true  ),
49                         '#https?://wordpress.tv/.*#i'                         => array( 'http://wordpress.tv/oembed/',                        true ),
50                         '#https?://(.+\.)?polldaddy\.com/.*#i'                => array( 'https://polldaddy.com/oembed/',                      true  ),
51                         '#https?://poll\.fm/.*#i'                             => array( 'https://polldaddy.com/oembed/',                      true  ),
52                         '#https?://(www\.)?funnyordie\.com/videos/.*#i'       => array( 'http://www.funnyordie.com/oembed',                   true  ),
53                         '#https?://(www\.)?twitter\.com/.+?/status(es)?/.*#i' => array( 'https://api.twitter.com/1/statuses/oembed.{format}', true  ),
54                         '#https?://(www\.)?soundcloud\.com/.*#i'              => array( 'http://soundcloud.com/oembed',                       true  ),
55                         '#https?://(www\.)?slideshare\.net/.*#i'              => array( 'https://www.slideshare.net/api/oembed/2',            true  ),
56                         '#http://instagr(\.am|am\.com)/p/.*#i'                => array( 'http://api.instagram.com/oembed',                    true  ),
57                         '#https?://(www\.)?rdio\.com/.*#i'                    => array( 'http://www.rdio.com/api/oembed/',                    true  ),
58                         '#https?://rd\.io/x/.*#i'                             => array( 'http://www.rdio.com/api/oembed/',                    true  ),
59                         '#https?://(open|play)\.spotify\.com/.*#i'            => array( 'https://embed.spotify.com/oembed/',                  true  ),
60                         '#https?://(.+\.)?imgur\.com/.*#i'                    => array( 'http://api.imgur.com/oembed',                        true  ),
61                         '#https?://(www\.)?meetu(\.ps|p\.com)/.*#i'           => array( 'http://api.meetup.com/oembed',                       true  ),
62                         '#https?://(www\.)?issuu\.com/.+/docs/.+#i'           => array( 'http://issuu.com/oembed_wp',                         true  ),
63                         '#https?://(www\.)?collegehumor\.com/video/.*#i'      => array( 'http://www.collegehumor.com/oembed.{format}',        true  ),
64                         '#https?://(www\.)?mixcloud\.com/.*#i'                => array( 'http://www.mixcloud.com/oembed',                     true  ),
65                         '#https?://(www\.|embed\.)?ted\.com/talks/.*#i'       => array( 'http://www.ted.com/talks/oembed.{format}',           true  ),
66                         '#https?://(www\.)?(animoto|video214)\.com/play/.*#i' => array( 'http://animoto.com/oembeds/create',                  true  ),
67                 );
68
69                 if ( ! empty( self::$early_providers['add'] ) ) {
70                         foreach ( self::$early_providers['add'] as $format => $data ) {
71                                 $providers[ $format ] = $data;
72                         }
73                 }
74
75                 if ( ! empty( self::$early_providers['remove'] ) ) {
76                         foreach ( self::$early_providers['remove'] as $format ) {
77                                 unset( $providers[ $format ] );
78                         }
79                 }
80
81                 self::$early_providers = array();
82
83                 /**
84                  * Filter the list of oEmbed providers.
85                  *
86                  * Discovery is disabled for users lacking the unfiltered_html capability.
87                  * Only providers in this array will be used for those users.
88                  *
89                  * Supported providers:
90                  *
91                  * | ------------ | -------------------- | ----- | --------- |
92                  * |   Provider   |        Flavor        |  SSL  |   Since   |
93                  * | ------------ | -------------------- | ----- | --------- |
94                  * | Blip         | blip.tv              |       | 2.9.0     |
95                  * | Dailymotion  | dailymotion.com      |  Yes  | 2.9.0     |
96                  * | Flickr       | flickr.com           |  Yes  | 2.9.0     |
97                  * | Hulu         | hulu.com             |  Yes  | 2.9.0     |
98                  * | Photobucket  | photobucket.com      |       | 2.9.0     |
99                  * | Revision3    | revision3.com        |       | 2.9.0     |
100                  * | Scribd       | scribd.com           |  Yes  | 2.9.0     |
101                  * | Vimeo        | vimeo.com            |  Yes  | 2.9.0     |
102                  * | WordPress.tv | wordpress.tv         |  Yes  | 2.9.0     |
103                  * | YouTube      | youtube.com/watch    |  Yes  | 2.9.0     |
104                  * | ------------ | -------------------- | ----- | --------- |
105                  * | Funny or Die | funnyordie.com       |  Yes  | 3.0.0     |
106                  * | Polldaddy    | polldaddy.com        |  Yes  | 3.0.0     |
107                  * | SmugMug      | smugmug.com          |  Yes  | 3.0.0     |
108                  * | YouTube      | youtu.be             |  Yes  | 3.0.0     |
109                  * | ------------ | -------------------- | ----- | --------- |
110                  * | Twitter      | twitter.com          |  Yes  | 3.4.0     |
111                  * | ------------ | -------------------- | ----- | --------- |
112                  * | Instagram    | instagram.com        |       | 3.5.0     |
113                  * | Instagram    | instagr.am           |       | 3.5.0     |
114                  * | Slideshare   | slideshare.net       |  Yes  | 3.5.0     |
115                  * | SoundCloud   | soundcloud.com       |  Yes  | 3.5.0     |
116                  * | ------------ | -------------------- | ----- | --------- |
117                  * | Dailymotion  | dai.ly               |       | 3.6.0     |
118                  * | Flickr       | flic.kr              |  Yes  | 3.6.0     |
119                  * | Rdio         | rdio.com             |  Yes  | 3.6.0     |
120                  * | Rdio         | rd.io                |  Yes  | 3.6.0     |
121                  * | Spotify      | spotify.com          |  Yes  | 3.6.0     |
122                  * | ------------ | -------------------- | ----- | --------- |
123                  * | Imgur        | imgur.com            |  Yes  | 3.9.0     |
124                  * | Meetup.com   | meetup.com           |  Yes  | 3.9.0     |
125                  * | Meetup.com   | meetu.ps             |  Yes  | 3.9.0     |
126                  * | ------------ | -------------------- | ----- | --------- |
127                  * | Animoto      | animoto.com          |  Yes  | 4.0.0     |
128                  * | Animoto      | video214.com         |  Yes  | 4.0.0     |
129                  * | CollegeHumor | collegehumor.com     |  Yes  | 4.0.0     |
130                  * | Issuu        | issuu.com            |  Yes  | 4.0.0     |
131                  * | Mixcloud     | mixcloud.com         |  Yes  | 4.0.0     |
132                  * | Polldaddy    | poll.fm              |  Yes  | 4.0.0     |
133                  * | TED          | ted.com              |  Yes  | 4.0.0     |
134                  * | YouTube      | youtube.com/playlist |  Yes  | 4.0.0     |
135                  * | ------------ | -------------------- | ----- | --------- |
136                  *
137                  * No longer supported providers:
138                  *
139                  * | ------------ | -------------------- | ----- | --------- | --------- |
140                  * |   Provider   |        Flavor        |  SSL  |   Since   |  Removed  |
141                  * | ------------ | -------------------- | ----- | --------- | --------- |
142                  * | Qik          | qik.com              |  Yes  | 2.9.0     | 3.9.0     |
143                  * | ------------ | -------------------- | ----- | --------- | --------- |
144                  * | Viddler      | viddler.com          |  Yes  | 2.9.0     | 4.0.0     |
145                  * | ------------ | -------------------- | ----- | --------- | --------- |
146                  *
147                  * @see wp_oembed_add_provider()
148                  *
149                  * @since 2.9.0
150                  *
151                  * @param array $providers An array of popular oEmbed providers.
152                  */
153                 $this->providers = apply_filters( 'oembed_providers', $providers );
154
155                 // Fix any embeds that contain new lines in the middle of the HTML which breaks wpautop().
156                 add_filter( 'oembed_dataparse', array($this, '_strip_newlines'), 10, 3 );
157         }
158
159         /**
160          * Make private/protected methods readable for backwards compatibility.
161          *
162          * @since 4.0.0
163          * @access public
164          *
165          * @param callable $name      Method to call.
166          * @param array    $arguments Arguments to pass when calling.
167          * @return mixed|bool Return value of the callback, false otherwise.
168          */
169         public function __call( $name, $arguments ) {
170                 return call_user_func_array( array( $this, $name ), $arguments );
171         }
172
173         /**
174          * Takes a URL and returns the corresponding oEmbed provider's URL, if there is one.
175          *
176          * @since 4.0.0
177          * @access public
178          *
179          * @see WP_oEmbed::discover()
180          *
181          * @param string        $url  The URL to the content.
182          * @param string|array  $args Optional provider arguments.
183          * @return bool|string False on failure, otherwise the oEmbed provider URL.
184          */
185         public function get_provider( $url, $args = '' ) {
186
187                 $provider = false;
188
189                 if ( !isset($args['discover']) )
190                         $args['discover'] = true;
191
192                 foreach ( $this->providers as $matchmask => $data ) {
193                         list( $providerurl, $regex ) = $data;
194
195                         // Turn the asterisk-type provider URLs into regex
196                         if ( !$regex ) {
197                                 $matchmask = '#' . str_replace( '___wildcard___', '(.+)', preg_quote( str_replace( '*', '___wildcard___', $matchmask ), '#' ) ) . '#i';
198                                 $matchmask = preg_replace( '|^#http\\\://|', '#https?\://', $matchmask );
199                         }
200
201                         if ( preg_match( $matchmask, $url ) ) {
202                                 $provider = str_replace( '{format}', 'json', $providerurl ); // JSON is easier to deal with than XML
203                                 break;
204                         }
205                 }
206
207                 if ( !$provider && $args['discover'] )
208                         $provider = $this->discover( $url );
209
210                 return $provider;
211         }
212
213         /**
214          * Add an oEmbed provider just-in-time when wp_oembed_add_provider() is called
215          * before the 'plugins_loaded' hook.
216          *
217          * The just-in-time addition is for the benefit of the 'oembed_providers' filter.
218          *
219          * @since 4.0.0
220          * @access public
221          * @static
222          *
223          * @see wp_oembed_add_provider()
224          *
225          * @param string $format   Format of URL that this provider can handle. You can use
226          *                         asterisks as wildcards.
227          * @param string $provider The URL to the oEmbed provider..
228          * @param bool   $regex    Optional. Whether the $format parameter is in a regex format.
229          *                         Default false.
230          */
231         public static function _add_provider_early( $format, $provider, $regex = false ) {
232                 if ( empty( self::$early_providers['add'] ) ) {
233                         self::$early_providers['add'] = array();
234                 }
235
236                 self::$early_providers['add'][ $format ] = array( $provider, $regex );
237         }
238
239         /**
240          * Remove an oEmbed provider just-in-time when wp_oembed_remove_provider() is called
241          * before the 'plugins_loaded' hook.
242          *
243          * The just-in-time removal is for the benefit of the 'oembed_providers' filter.
244          *
245          * @since 4.0.0
246          * @access public
247          * @static
248          *
249          * @see wp_oembed_remove_provider()
250          *
251          * @param string $format The format of URL that this provider can handle. You can use
252          *                       asterisks as wildcards.
253          */
254         public static function _remove_provider_early( $format ) {
255                 if ( empty( self::$early_providers['remove'] ) ) {
256                         self::$early_providers['remove'] = array();
257                 }
258
259                 self::$early_providers['remove'][] = $format;
260         }
261
262         /**
263          * The do-it-all function that takes a URL and attempts to return the HTML.
264          *
265          * @see WP_oEmbed::fetch()
266          * @see WP_oEmbed::data2html()
267          *
268          * @param string $url The URL to the content that should be attempted to be embedded.
269          * @param array $args Optional arguments. Usually passed from a shortcode.
270          * @return bool|string False on failure, otherwise the UNSANITIZED (and potentially unsafe) HTML that should be used to embed.
271          */
272         function get_html( $url, $args = '' ) {
273                 $provider = $this->get_provider( $url, $args );
274
275                 if ( !$provider || false === $data = $this->fetch( $provider, $url, $args ) )
276                         return false;
277
278                 /**
279                  * Filter the HTML returned by the oEmbed provider.
280                  *
281                  * @since 2.9.0
282                  *
283                  * @param string $data The returned oEmbed HTML.
284                  * @param string $url  URL of the content to be embedded.
285                  * @param array  $args Optional arguments, usually passed from a shortcode.
286                  */
287                 return apply_filters( 'oembed_result', $this->data2html( $data, $url ), $url, $args );
288         }
289
290         /**
291          * Attempts to find oEmbed provider discovery <link> tags at the given URL.
292          *
293          * @param string $url The URL that should be inspected for discovery <link> tags.
294          * @return bool|string False on failure, otherwise the oEmbed provider URL.
295          */
296         public function discover( $url ) {
297                 $providers = array();
298
299                 /**
300                  * Filter oEmbed remote get arguments.
301                  *
302                  * @since 4.0.0
303                  *
304                  * @see WP_Http::request()
305                  *
306                  * @param array  $args oEmbed remote get arguments.
307                  * @param string $url  URL to be inspected.
308                  */
309                 $args = apply_filters( 'oembed_remote_get_args', array(), $url );
310
311                 // Fetch URL content
312                 $request = wp_safe_remote_get( $url, $args );
313                 if ( $html = wp_remote_retrieve_body( $request ) ) {
314
315                         /**
316                          * Filter the link types that contain oEmbed provider URLs.
317                          *
318                          * @since 2.9.0
319                          *
320                          * @param array $format Array of oEmbed link types. Accepts 'application/json+oembed',
321                          *                      'text/xml+oembed', and 'application/xml+oembed' (incorrect,
322                          *                      used by at least Vimeo).
323                          */
324                         $linktypes = apply_filters( 'oembed_linktypes', array(
325                                 'application/json+oembed' => 'json',
326                                 'text/xml+oembed' => 'xml',
327                                 'application/xml+oembed' => 'xml',
328                         ) );
329
330                         // Strip <body>
331                         $html = substr( $html, 0, stripos( $html, '</head>' ) );
332
333                         // Do a quick check
334                         $tagfound = false;
335                         foreach ( $linktypes as $linktype => $format ) {
336                                 if ( stripos($html, $linktype) ) {
337                                         $tagfound = true;
338                                         break;
339                                 }
340                         }
341
342                         if ( $tagfound && preg_match_all( '/<link([^<>]+)>/i', $html, $links ) ) {
343                                 foreach ( $links[1] as $link ) {
344                                         $atts = shortcode_parse_atts( $link );
345
346                                         if ( !empty($atts['type']) && !empty($linktypes[$atts['type']]) && !empty($atts['href']) ) {
347                                                 $providers[$linktypes[$atts['type']]] = $atts['href'];
348
349                                                 // Stop here if it's JSON (that's all we need)
350                                                 if ( 'json' == $linktypes[$atts['type']] )
351                                                         break;
352                                         }
353                                 }
354                         }
355                 }
356
357                 // JSON is preferred to XML
358                 if ( !empty($providers['json']) )
359                         return $providers['json'];
360                 elseif ( !empty($providers['xml']) )
361                         return $providers['xml'];
362                 else
363                         return false;
364         }
365
366         /**
367          * Connects to a oEmbed provider and returns the result.
368          *
369          * @param string $provider The URL to the oEmbed provider.
370          * @param string $url The URL to the content that is desired to be embedded.
371          * @param array $args Optional arguments. Usually passed from a shortcode.
372          * @return bool|object False on failure, otherwise the result in the form of an object.
373          */
374         public function fetch( $provider, $url, $args = '' ) {
375                 $args = wp_parse_args( $args, wp_embed_defaults( $url ) );
376
377                 $provider = add_query_arg( 'maxwidth', (int) $args['width'], $provider );
378                 $provider = add_query_arg( 'maxheight', (int) $args['height'], $provider );
379                 $provider = add_query_arg( 'url', urlencode($url), $provider );
380
381                 /**
382                  * Filter the oEmbed URL to be fetched.
383                  *
384                  * @since 2.9.0
385                  *
386                  * @param string $provider URL of the oEmbed provider.
387                  * @param string $url      URL of the content to be embedded.
388                  * @param array  $args     Optional arguments, usually passed from a shortcode.
389                  */
390                 $provider = apply_filters( 'oembed_fetch_url', $provider, $url, $args );
391
392                 foreach( array( 'json', 'xml' ) as $format ) {
393                         $result = $this->_fetch_with_format( $provider, $format );
394                         if ( is_wp_error( $result ) && 'not-implemented' == $result->get_error_code() )
395                                 continue;
396                         return ( $result && ! is_wp_error( $result ) ) ? $result : false;
397                 }
398                 return false;
399         }
400
401         /**
402          * Fetches result from an oEmbed provider for a specific format and complete provider URL
403          *
404          * @since 3.0.0
405          * @access private
406          * @param string $provider_url_with_args URL to the provider with full arguments list (url, maxheight, etc.)
407          * @param string $format Format to use
408          * @return bool|object False on failure, otherwise the result in the form of an object.
409          */
410         private function _fetch_with_format( $provider_url_with_args, $format ) {
411                 $provider_url_with_args = add_query_arg( 'format', $format, $provider_url_with_args );
412
413                 /** This filter is documented in wp-includes/class-oembed.php */
414                 $args = apply_filters( 'oembed_remote_get_args', array(), $provider_url_with_args );
415
416                 $response = wp_safe_remote_get( $provider_url_with_args, $args );
417                 if ( 501 == wp_remote_retrieve_response_code( $response ) )
418                         return new WP_Error( 'not-implemented' );
419                 if ( ! $body = wp_remote_retrieve_body( $response ) )
420                         return false;
421                 $parse_method = "_parse_$format";
422                 return $this->$parse_method( $body );
423         }
424
425         /**
426          * Parses a json response body.
427          *
428          * @since 3.0.0
429          * @access private
430          */
431         private function _parse_json( $response_body ) {
432                 return ( ( $data = json_decode( trim( $response_body ) ) ) && is_object( $data ) ) ? $data : false;
433         }
434
435         /**
436          * Parses an XML response body.
437          *
438          * @since 3.0.0
439          * @access private
440          */
441         private function _parse_xml( $response_body ) {
442                 if ( ! function_exists( 'libxml_disable_entity_loader' ) )
443                         return false;
444
445                 $loader = libxml_disable_entity_loader( true );
446                 $errors = libxml_use_internal_errors( true );
447
448                 $return = $this->_parse_xml_body( $response_body );
449
450                 libxml_use_internal_errors( $errors );
451                 libxml_disable_entity_loader( $loader );
452
453                 return $return;
454         }
455
456         /**
457          * Helper function for parsing an XML response body.
458          *
459          * @since 3.6.0
460          * @access private
461          */
462         private function _parse_xml_body( $response_body ) {
463                 if ( ! function_exists( 'simplexml_import_dom' ) || ! class_exists( 'DOMDocument' ) )
464                         return false;
465
466                 $dom = new DOMDocument;
467                 $success = $dom->loadXML( $response_body );
468                 if ( ! $success )
469                         return false;
470
471                 if ( isset( $dom->doctype ) )
472                         return false;
473
474                 foreach ( $dom->childNodes as $child ) {
475                         if ( XML_DOCUMENT_TYPE_NODE === $child->nodeType )
476                                 return false;
477                 }
478
479                 $xml = simplexml_import_dom( $dom );
480                 if ( ! $xml )
481                         return false;
482
483                 $return = new stdClass;
484                 foreach ( $xml as $key => $value ) {
485                         $return->$key = (string) $value;
486                 }
487
488                 return $return;
489         }
490
491         /**
492          * Converts a data object from {@link WP_oEmbed::fetch()} and returns the HTML.
493          *
494          * @param object $data A data object result from an oEmbed provider.
495          * @param string $url The URL to the content that is desired to be embedded.
496          * @return bool|string False on error, otherwise the HTML needed to embed.
497          */
498         public function data2html( $data, $url ) {
499                 if ( ! is_object( $data ) || empty( $data->type ) )
500                         return false;
501
502                 $return = false;
503
504                 switch ( $data->type ) {
505                         case 'photo':
506                                 if ( empty( $data->url ) || empty( $data->width ) || empty( $data->height ) )
507                                         break;
508                                 if ( ! is_string( $data->url ) || ! is_numeric( $data->width ) || ! is_numeric( $data->height ) )
509                                         break;
510
511                                 $title = ! empty( $data->title ) && is_string( $data->title ) ? $data->title : '';
512                                 $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>';
513                                 break;
514
515                         case 'video':
516                         case 'rich':
517                                 if ( ! empty( $data->html ) && is_string( $data->html ) )
518                                         $return = $data->html;
519                                 break;
520
521                         case 'link':
522                                 if ( ! empty( $data->title ) && is_string( $data->title ) )
523                                         $return = '<a href="' . esc_url( $url ) . '">' . esc_html( $data->title ) . '</a>';
524                                 break;
525
526                         default:
527                                 $return = false;
528                 }
529
530                 /**
531                  * Filter the returned oEmbed HTML.
532                  *
533                  * Use this filter to add support for custom data types, or to filter the result.
534                  *
535                  * @since 2.9.0
536                  *
537                  * @param string $return The returned oEmbed HTML.
538                  * @param object $data   A data object result from an oEmbed provider.
539                  * @param string $url    The URL of the content to be embedded.
540                  */
541                 return apply_filters( 'oembed_dataparse', $return, $data, $url );
542         }
543
544         /**
545          * Strip any new lines from the HTML.
546          *
547          * @access private
548          * @param string $html Existing HTML.
549          * @param object $data Data object from WP_oEmbed::data2html()
550          * @param string $url The original URL passed to oEmbed.
551          * @return string Possibly modified $html
552          */
553         private function _strip_newlines( $html, $data, $url ) {
554                 if ( false !== strpos( $html, "\n" ) )
555                         $html = str_replace( array( "\r\n", "\n" ), '', $html );
556
557                 return $html;
558         }
559 }
560
561 /**
562  * Returns the initialized {@link WP_oEmbed} object
563  *
564  * @since 2.9.0
565  * @access private
566  *
567  * @see WP_oEmbed
568  * @uses WP_oEmbed
569  *
570  * @return WP_oEmbed object.
571  */
572 function _wp_oembed_get_object() {
573         static $wp_oembed;
574
575         if ( is_null($wp_oembed) )
576                 $wp_oembed = new WP_oEmbed();
577
578         return $wp_oembed;
579 }