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