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://developer.wordpress.org/advanced-administration/wordpress/oembed/
  8 * @link http://oembed.com/
  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#[AllowDynamicProperties]
 20class WP_oEmbed {
 21
 22	/**
 23	 * A list of oEmbed providers.
 24	 *
 25	 * @since 2.9.0
 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	 * @var array
 35	 */
 36	public static $early_providers = array();
 37
 38	/**
 39	 * A list of private/protected methods, used for backward compatibility.
 40	 *
 41	 * @since 4.2.0
 42	 * @var array
 43	 */
 44	private $compat_methods = array( '_fetch_with_format', '_parse_json', '_parse_xml', '_parse_xml_body' );
 45
 46	/**
 47	 * Constructor.
 48	 *
 49	 * @since 2.9.0
 50	 */
 51	public function __construct() {
 52		$host      = urlencode( home_url() );
 53		$providers = array(
 54			'#https?://((m|www)\.)?youtube\.com/watch.*#i' => array( 'https://www.youtube.com/oembed', true ),
 55			'#https?://((m|www)\.)?youtube\.com/playlist.*#i' => array( 'https://www.youtube.com/oembed', true ),
 56			'#https?://((m|www)\.)?youtube\.com/shorts/*#i' => array( 'https://www.youtube.com/oembed', true ),
 57			'#https?://((m|www)\.)?youtube\.com/live/*#i'  => array( 'https://www.youtube.com/oembed', true ),
 58			'#https?://youtu\.be/.*#i'                     => array( 'https://www.youtube.com/oembed', true ),
 59			'#https?://(.+\.)?vimeo\.com/.*#i'             => array( 'https://vimeo.com/api/oembed.{format}', true ),
 60			'#https?://(www\.)?dailymotion\.com/.*#i'      => array( 'https://www.dailymotion.com/services/oembed', true ),
 61			'#https?://dai\.ly/.*#i'                       => array( 'https://www.dailymotion.com/services/oembed', true ),
 62			'#https?://(www\.)?flickr\.com/.*#i'           => array( 'https://www.flickr.com/services/oembed/', true ),
 63			'#https?://flic\.kr/.*#i'                      => array( 'https://www.flickr.com/services/oembed/', true ),
 64			'#https?://(.+\.)?smugmug\.com/.*#i'           => array( 'https://api.smugmug.com/services/oembed/', true ),
 65			'#https?://(www\.)?scribd\.com/(doc|document)/.*#i' => array( 'https://www.scribd.com/services/oembed', true ),
 66			'#https?://wordpress\.tv/.*#i'                 => array( 'https://wordpress.tv/oembed/', true ),
 67			'#https?://(.+\.)?crowdsignal\.net/.*#i'       => array( 'https://api.crowdsignal.com/oembed', true ),
 68			'#https?://(.+\.)?polldaddy\.com/.*#i'         => array( 'https://api.crowdsignal.com/oembed', true ),
 69			'#https?://poll\.fm/.*#i'                      => array( 'https://api.crowdsignal.com/oembed', true ),
 70			'#https?://(.+\.)?survey\.fm/.*#i'             => array( 'https://api.crowdsignal.com/oembed', true ),
 71			'#https?://(www\.)?twitter\.com/\w{1,15}/status(es)?/.*#i' => array( 'https://publish.twitter.com/oembed', true ),
 72			'#https?://(www\.)?twitter\.com/\w{1,15}$#i'   => array( 'https://publish.twitter.com/oembed', true ),
 73			'#https?://(www\.)?twitter\.com/\w{1,15}/likes$#i' => array( 'https://publish.twitter.com/oembed', true ),
 74			'#https?://(www\.)?twitter\.com/\w{1,15}/lists/.*#i' => array( 'https://publish.twitter.com/oembed', true ),
 75			'#https?://(www\.)?twitter\.com/\w{1,15}/timelines/.*#i' => array( 'https://publish.twitter.com/oembed', true ),
 76			'#https?://(www\.)?twitter\.com/i/moments/.*#i' => array( 'https://publish.twitter.com/oembed', true ),
 77			'#https?://(www\.)?soundcloud\.com/.*#i'       => array( 'https://soundcloud.com/oembed', true ),
 78			'#https?://(open|play)\.spotify\.com/.*#i'     => array( 'https://embed.spotify.com/oembed/', true ),
 79			'#https?://(.+\.)?imgur\.com/.*#i'             => array( 'https://api.imgur.com/oembed', true ),
 80			'#https?://(www\.)?issuu\.com/.+/docs/.+#i'    => array( 'https://issuu.com/oembed_wp', true ),
 81			'#https?://(www\.)?mixcloud\.com/.*#i'         => array( 'https://app.mixcloud.com/oembed/', true ),
 82			'#https?://(www\.|embed\.)?ted\.com/talks/.*#i' => array( 'https://www.ted.com/services/v1/oembed.{format}', true ),
 83			'#https?://(www\.)?(animoto|video214)\.com/play/.*#i' => array( 'https://animoto.com/oembeds/create', true ),
 84			'#https?://(.+)\.tumblr\.com/.*#i'             => array( 'https://www.tumblr.com/oembed/1.0', true ),
 85			'#https?://(www\.)?kickstarter\.com/projects/.*#i' => array( 'https://www.kickstarter.com/services/oembed', true ),
 86			'#https?://kck\.st/.*#i'                       => array( 'https://www.kickstarter.com/services/oembed', true ),
 87			'#https?://cloudup\.com/.*#i'                  => array( 'https://cloudup.com/oembed', true ),
 88			'#https?://(www\.)?reverbnation\.com/.*#i'     => array( 'https://www.reverbnation.com/oembed', true ),
 89			'#https?://videopress\.com/v/.*#'              => array( 'https://public-api.wordpress.com/oembed/?for=' . $host, true ),
 90			'#https?://(www\.)?reddit\.com/r/[^/]+/comments/.*#i' => array( 'https://www.reddit.com/oembed', true ),
 91			'#https?://(www\.)?speakerdeck\.com/.*#i'      => array( 'https://speakerdeck.com/oembed.{format}', true ),
 92			'#https?://([a-z0-9-]+\.)?amazon\.(com|com\.mx|com\.br|ca)/.*#i' => array( 'https://read.amazon.com/kp/api/oembed', true ),
 93			'#https?://([a-z0-9-]+\.)?amazon\.(co\.uk|de|fr|it|es|in|nl|ru)/.*#i' => array( 'https://read.amazon.co.uk/kp/api/oembed', true ),
 94			'#https?://([a-z0-9-]+\.)?amazon\.(co\.jp|com\.au)/.*#i' => array( 'https://read.amazon.com.au/kp/api/oembed', true ),
 95			'#https?://([a-z0-9-]+\.)?amazon\.cn/.*#i'     => array( 'https://read.amazon.cn/kp/api/oembed', true ),
 96			'#https?://(www\.)?a\.co/.*#i'                 => array( 'https://read.amazon.com/kp/api/oembed', true ),
 97			'#https?://(www\.)?amzn\.to/.*#i'              => array( 'https://read.amazon.com/kp/api/oembed', true ),
 98			'#https?://(www\.)?amzn\.eu/.*#i'              => array( 'https://read.amazon.co.uk/kp/api/oembed', true ),
 99			'#https?://(www\.)?amzn\.in/.*#i'              => array( 'https://read.amazon.in/kp/api/oembed', true ),
100			'#https?://(www\.)?amzn\.asia/.*#i'            => array( 'https://read.amazon.com.au/kp/api/oembed', true ),
101			'#https?://(www\.)?z\.cn/.*#i'                 => array( 'https://read.amazon.cn/kp/api/oembed', true ),
102			'#https?://www\.someecards\.com/.+-cards/.+#i' => array( 'https://www.someecards.com/v2/oembed/', true ),
103			'#https?://www\.someecards\.com/usercards/viewcard/.+#i' => array( 'https://www.someecards.com/v2/oembed/', true ),
104			'#https?://some\.ly\/.+#i'                     => array( 'https://www.someecards.com/v2/oembed/', true ),
105			'#https?://(www\.)?tiktok\.com/.*/video/.*#i'  => array( 'https://www.tiktok.com/oembed', true ),
106			'#https?://(www\.)?tiktok\.com/@.*#i'          => array( 'https://www.tiktok.com/oembed', true ),
107			'#https?://([a-z]{2}|www)\.pinterest\.com(\.(au|mx))?/.*#i' => array( 'https://www.pinterest.com/oembed.json', true ),
108			'#https?://(www\.)?wolframcloud\.com/obj/.+#i' => array( 'https://www.wolframcloud.com/oembed', true ),
109			'#https?://pca\.st/.+#i'                       => array( 'https://pca.st/oembed.json', true ),
110			'#https?://((play|www)\.)?anghami\.com/.*#i'   => array( 'https://api.anghami.com/rest/v1/oembed.view', true ),
111			'#https?://bsky.app/profile/.*/post/.*#i'      => array( 'https://embed.bsky.app/oembed', true ),
112			'#https?://(www\.)?canva\.com/design/.*/view.*#i' => array( 'https://canva.com/_oembed', true ),
113		);
114
115		if ( ! empty( self::$early_providers['add'] ) ) {
116			foreach ( self::$early_providers['add'] as $format => $data ) {
117				$providers[ $format ] = $data;
118			}
119		}
120
121		if ( ! empty( self::$early_providers['remove'] ) ) {
122			foreach ( self::$early_providers['remove'] as $format ) {
123				unset( $providers[ $format ] );
124			}
125		}
126
127		self::$early_providers = array();
128
129		/**
130		 * Filters the list of sanctioned oEmbed providers.
131		 *
132		 * Since WordPress 4.4, oEmbed discovery is enabled for all users and allows embedding of sanitized
133		 * iframes. The providers in this list are sanctioned, meaning they are trusted and allowed to
134		 * embed any content, such as iframes, videos, JavaScript, and arbitrary HTML.
135		 *
136		 * Supported providers:
137		 *
138		 * |   Provider   |                     Flavor                |  Since  |
139		 * | ------------ | ----------------------------------------- | ------- |
140		 * | Dailymotion  | dailymotion.com                           | 2.9.0   |
141		 * | Flickr       | flickr.com                                | 2.9.0   |
142		 * | Scribd       | scribd.com                                | 2.9.0   |
143		 * | Vimeo        | vimeo.com                                 | 2.9.0   |
144		 * | WordPress.tv | wordpress.tv                              | 2.9.0   |
145		 * | YouTube      | youtube.com/watch                         | 2.9.0   |
146		 * | Crowdsignal  | polldaddy.com                             | 3.0.0   |
147		 * | SmugMug      | smugmug.com                               | 3.0.0   |
148		 * | YouTube      | youtu.be                                  | 3.0.0   |
149		 * | Twitter      | twitter.com                               | 3.4.0   |
150		 * | SoundCloud   | soundcloud.com                            | 3.5.0   |
151		 * | Dailymotion  | dai.ly                                    | 3.6.0   |
152		 * | Flickr       | flic.kr                                   | 3.6.0   |
153		 * | Spotify      | spotify.com                               | 3.6.0   |
154		 * | Imgur        | imgur.com                                 | 3.9.0   |
155		 * | Animoto      | animoto.com                               | 4.0.0   |
156		 * | Animoto      | video214.com                              | 4.0.0   |
157		 * | Issuu        | issuu.com                                 | 4.0.0   |
158		 * | Mixcloud     | mixcloud.com                              | 4.0.0   |
159		 * | Crowdsignal  | poll.fm                                   | 4.0.0   |
160		 * | TED          | ted.com                                   | 4.0.0   |
161		 * | YouTube      | youtube.com/playlist                      | 4.0.0   |
162		 * | Tumblr       | tumblr.com                                | 4.2.0   |
163		 * | Kickstarter  | kickstarter.com                           | 4.2.0   |
164		 * | Kickstarter  | kck.st                                    | 4.2.0   |
165		 * | Cloudup      | cloudup.com                               | 4.3.0   |
166		 * | ReverbNation | reverbnation.com                          | 4.4.0   |
167		 * | VideoPress   | videopress.com                            | 4.4.0   |
168		 * | Reddit       | reddit.com                                | 4.4.0   |
169		 * | Speaker Deck | speakerdeck.com                           | 4.4.0   |
170		 * | Twitter      | twitter.com/timelines                     | 4.5.0   |
171		 * | Twitter      | twitter.com/moments                       | 4.5.0   |
172		 * | Twitter      | twitter.com/user                          | 4.7.0   |
173		 * | Twitter      | twitter.com/likes                         | 4.7.0   |
174		 * | Twitter      | twitter.com/lists                         | 4.7.0   |
175		 * | Screencast   | screencast.com                            | 4.8.0   |
176		 * | Amazon       | amazon.com (com.mx, com.br, ca)           | 4.9.0   |
177		 * | Amazon       | amazon.de (fr, it, es, in, nl, ru, co.uk) | 4.9.0   |
178		 * | Amazon       | amazon.co.jp (com.au)                     | 4.9.0   |
179		 * | Amazon       | amazon.cn                                 | 4.9.0   |
180		 * | Amazon       | a.co                                      | 4.9.0   |
181		 * | Amazon       | amzn.to (eu, in, asia)                    | 4.9.0   |
182		 * | Amazon       | z.cn                                      | 4.9.0   |
183		 * | Someecards   | someecards.com                            | 4.9.0   |
184		 * | Someecards   | some.ly                                   | 4.9.0   |
185		 * | Crowdsignal  | survey.fm                                 | 5.1.0   |
186		 * | TikTok       | tiktok.com                                | 5.4.0   |
187		 * | Pinterest    | pinterest.com                             | 5.9.0   |
188		 * | WolframCloud | wolframcloud.com                          | 5.9.0   |
189		 * | Pocket Casts | pocketcasts.com                           | 6.1.0   |
190		 * | Crowdsignal  | crowdsignal.net                           | 6.2.0   |
191		 * | Anghami      | anghami.com                               | 6.3.0   |
192		 * | Bluesky      | bsky.app                                  | 6.6.0   |
193		 * | Canva        | canva.com                                 | 6.8.0   |
194		 *
195		 * No longer supported providers:
196		 *
197		 * |   Provider   |        Flavor        |   Since   |  Removed  |
198		 * | ------------ | -------------------- | --------- | --------- |
199		 * | Qik          | qik.com              | 2.9.0     | 3.9.0     |
200		 * | Viddler      | viddler.com          | 2.9.0     | 4.0.0     |
201		 * | Revision3    | revision3.com        | 2.9.0     | 4.2.0     |
202		 * | Blip         | blip.tv              | 2.9.0     | 4.4.0     |
203		 * | Rdio         | rdio.com             | 3.6.0     | 4.4.1     |
204		 * | Rdio         | rd.io                | 3.6.0     | 4.4.1     |
205		 * | Vine         | vine.co              | 4.1.0     | 4.9.0     |
206		 * | Photobucket  | photobucket.com      | 2.9.0     | 5.1.0     |
207		 * | Funny or Die | funnyordie.com       | 3.0.0     | 5.1.0     |
208		 * | CollegeHumor | collegehumor.com     | 4.0.0     | 5.3.1     |
209		 * | Hulu         | hulu.com             | 2.9.0     | 5.5.0     |
210		 * | Instagram    | instagram.com        | 3.5.0     | 5.5.2     |
211		 * | Instagram    | instagr.am           | 3.5.0     | 5.5.2     |
212		 * | Instagram TV | instagram.com        | 5.1.0     | 5.5.2     |
213		 * | Instagram TV | instagr.am           | 5.1.0     | 5.5.2     |
214		 * | Facebook     | facebook.com         | 4.7.0     | 5.5.2     |
215		 * | Meetup.com   | meetup.com           | 3.9.0     | 6.0.1     |
216		 * | Meetup.com   | meetu.ps             | 3.9.0     | 6.0.1     |
217		 * | SlideShare   | slideshare.net       | 3.5.0     | 6.6.0     |
218		 * | Screencast   | screencast.com       | 4.8.0     | 6.8.2     |
219		 *
220		 * @see wp_oembed_add_provider()
221		 *
222		 * @since 2.9.0
223		 *
224		 * @param array[] $providers An array of arrays containing data about popular oEmbed providers.
225		 */
226		$this->providers = apply_filters( 'oembed_providers', $providers );
227
228		// Fix any embeds that contain new lines in the middle of the HTML which breaks wpautop().
229		add_filter( 'oembed_dataparse', array( $this, '_strip_newlines' ), 10, 3 );
230	}
231
232	/**
233	 * Exposes private/protected methods for backward compatibility.
234	 *
235	 * @since 4.0.0
236	 *
237	 * @param string $name      Method to call.
238	 * @param array  $arguments Arguments to pass when calling.
239	 * @return mixed|false Return value of the callback, false otherwise.
240	 */
241	public function __call( $name, $arguments ) {
242		if ( in_array( $name, $this->compat_methods, true ) ) {
243			return $this->$name( ...$arguments );
244		}
245
246		return false;
247	}
248
249	/**
250	 * Takes a URL and returns the corresponding oEmbed provider's URL, if there is one.
251	 *
252	 * @since 4.0.0
253	 *
254	 * @see WP_oEmbed::discover()
255	 *
256	 * @param string       $url  The URL to the content.
257	 * @param string|array $args {
258	 *     Optional. Additional provider arguments. Default empty.
259	 *
260	 *     @type bool $discover Optional. Determines whether to attempt to discover link tags
261	 *                          at the given URL for an oEmbed provider when the provider URL
262	 *                          is not found in the built-in providers list. Default true.
263	 * }
264	 * @return string|false The oEmbed provider URL on success, false on failure.
265	 */
266	public function get_provider( $url, $args = '' ) {
267		$args = wp_parse_args( $args );
268
269		$provider = false;
270
271		if ( ! isset( $args['discover'] ) ) {
272			$args['discover'] = true;
273		}
274
275		foreach ( $this->providers as $matchmask => $data ) {
276			list( $providerurl, $regex ) = $data;
277
278			// Turn the asterisk-type provider URLs into regex.
279			if ( ! $regex ) {
280				$matchmask = '#' . str_replace( '___wildcard___', '(.+)', preg_quote( str_replace( '*', '___wildcard___', $matchmask ), '#' ) ) . '#i';
281				$matchmask = preg_replace( '|^#http\\\://|', '#https?\://', $matchmask );
282			}
283
284			if ( preg_match( $matchmask, $url ) ) {
285				$provider = str_replace( '{format}', 'json', $providerurl ); // JSON is easier to deal with than XML.
286				break;
287			}
288		}
289
290		if ( ! $provider && $args['discover'] ) {
291			$provider = $this->discover( $url );
292		}
293
294		return $provider;
295	}
296
297	/**
298	 * Adds an oEmbed provider.
299	 *
300	 * The provider is added just-in-time when wp_oembed_add_provider() is called before
301	 * the {@see 'plugins_loaded'} hook.
302	 *
303	 * The just-in-time addition is for the benefit of the {@see 'oembed_providers'} filter.
304	 *
305	 * @since 4.0.0
306	 *
307	 * @see wp_oembed_add_provider()
308	 *
309	 * @param string $format   Format of URL that this provider can handle. You can use
310	 *                         asterisks as wildcards.
311	 * @param string $provider The URL to the oEmbed provider..
312	 * @param bool   $regex    Optional. Whether the $format parameter is in a regex format.
313	 *                         Default false.
314	 */
315	public static function _add_provider_early( $format, $provider, $regex = false ) {
316		if ( empty( self::$early_providers['add'] ) ) {
317			self::$early_providers['add'] = array();
318		}
319
320		self::$early_providers['add'][ $format ] = array( $provider, $regex );
321	}
322
323	/**
324	 * Removes an oEmbed provider.
325	 *
326	 * The provider is removed just-in-time when wp_oembed_remove_provider() is called before
327	 * the {@see 'plugins_loaded'} hook.
328	 *
329	 * The just-in-time removal is for the benefit of the {@see 'oembed_providers'} filter.
330	 *
331	 * @since 4.0.0
332	 *
333	 * @see wp_oembed_remove_provider()
334	 *
335	 * @param string $format The format of URL that this provider can handle. You can use
336	 *                       asterisks as wildcards.
337	 */
338	public static function _remove_provider_early( $format ) {
339		if ( empty( self::$early_providers['remove'] ) ) {
340			self::$early_providers['remove'] = array();
341		}
342
343		self::$early_providers['remove'][] = $format;
344	}
345
346	/**
347	 * Takes a URL and attempts to return the oEmbed data.
348	 *
349	 * @see WP_oEmbed::fetch()
350	 *
351	 * @since 4.8.0
352	 *
353	 * @param string       $url  The URL to the content that should be attempted to be embedded.
354	 * @param string|array $args Optional. Additional arguments for retrieving embed HTML.
355	 *                           See wp_oembed_get() for accepted arguments. Default empty.
356	 * @return object|false The result in the form of an object on success, false on failure.
357	 */
358	public function get_data( $url, $args = '' ) {
359		$args = wp_parse_args( $args );
360
361		$provider = $this->get_provider( $url, $args );
362
363		if ( ! $provider ) {
364			return false;
365		}
366
367		$data = $this->fetch( $provider, $url, $args );
368
369		if ( false === $data ) {
370			return false;
371		}
372
373		return $data;
374	}
375
376	/**
377	 * The do-it-all function that takes a URL and attempts to return the HTML.
378	 *
379	 * @see WP_oEmbed::fetch()
380	 * @see WP_oEmbed::data2html()
381	 *
382	 * @since 2.9.0
383	 *
384	 * @param string       $url  The URL to the content that should be attempted to be embedded.
385	 * @param string|array $args Optional. Additional arguments for retrieving embed HTML.
386	 *                           See wp_oembed_get() for accepted arguments. Default empty.
387	 * @return string|false The UNSANITIZED (and potentially unsafe) HTML that should be used to embed
388	 *                      on success, false on failure.
389	 */
390	public function get_html( $url, $args = '' ) {
391		/**
392		 * Filters the oEmbed result before any HTTP requests are made.
393		 *
394		 * This allows one to short-circuit the default logic, perhaps by
395		 * replacing it with a routine that is more optimal for your setup.
396		 *
397		 * Returning a non-null value from the filter will effectively short-circuit retrieval
398		 * and return the passed value instead.
399		 *
400		 * @since 4.5.3
401		 *
402		 * @param null|string  $result The UNSANITIZED (and potentially unsafe) HTML that should be used to embed.
403		 *                             Default null to continue retrieving the result.
404		 * @param string       $url    The URL to the content that should be attempted to be embedded.
405		 * @param string|array $args   Optional. Additional arguments for retrieving embed HTML.
406		 *                             See wp_oembed_get() for accepted arguments. Default empty.
407		 */
408		$pre = apply_filters( 'pre_oembed_result', null, $url, $args );
409
410		if ( null !== $pre ) {
411			return $pre;
412		}
413
414		$data = $this->get_data( $url, $args );
415
416		if ( false === $data ) {
417			return false;
418		}
419
420		/**
421		 * Filters the HTML returned by the oEmbed provider.
422		 *
423		 * @since 2.9.0
424		 *
425		 * @param string|false $data The returned oEmbed HTML (false if unsafe).
426		 * @param string       $url  URL of the content to be embedded.
427		 * @param string|array $args Optional. Additional arguments for retrieving embed HTML.
428		 *                           See wp_oembed_get() for accepted arguments. Default empty.
429		 */
430		return apply_filters( 'oembed_result', $this->data2html( $data, $url ), $url, $args );
431	}
432
433	/**
434	 * Attempts to discover link tags at the given URL for an oEmbed provider.
435	 *
436	 * @since 2.9.0
437	 *
438	 * @param string $url The URL that should be inspected for discovery `<link>` tags.
439	 * @return string|false The oEmbed provider URL on success, false on failure.
440	 */
441	public function discover( $url ) {
442		$providers = array();
443		$args      = array(
444			'limit_response_size' => 153600, // 150 KB
445		);
446
447		/**
448		 * Filters oEmbed remote get arguments.
449		 *
450		 * @since 4.0.0
451		 *
452		 * @see WP_Http::request()
453		 *
454		 * @param array  $args oEmbed remote get arguments.
455		 * @param string $url  URL to be inspected.
456		 */
457		$args = apply_filters( 'oembed_remote_get_args', $args, $url );
458
459		// Fetch URL content.
460		$request = wp_safe_remote_get( $url, $args );
461		$html    = wp_remote_retrieve_body( $request );
462		if ( $html ) {
463
464			/**
465			 * Filters the link types that contain oEmbed provider URLs.
466			 *
467			 * @since 2.9.0
468			 *
469			 * @param string[] $format Array of oEmbed link types. Accepts 'application/json+oembed',
470			 *                         'text/xml+oembed', and 'application/xml+oembed' (incorrect,
471			 *                         used by at least Vimeo).
472			 */
473			$linktypes = apply_filters(
474				'oembed_linktypes',
475				array(
476					'application/json+oembed' => 'json',
477					'text/xml+oembed'         => 'xml',
478					'application/xml+oembed'  => 'xml',
479				)
480			);
481
482			// Strip <body>.
483			$html_head_end = stripos( $html, '</head>' );
484			if ( $html_head_end ) {
485				$html = substr( $html, 0, $html_head_end );
486			}
487
488			// Do a quick check.
489			$tagfound = false;
490			foreach ( $linktypes as $linktype => $format ) {
491				if ( stripos( $html, $linktype ) ) {
492					$tagfound = true;
493					break;
494				}
495			}
496
497			if ( $tagfound && preg_match_all( '#<link([^<>]+)/?>#iU', $html, $links ) ) {
498				foreach ( $links[1] as $link ) {
499					$atts = shortcode_parse_atts( $link );
500
501					if ( ! empty( $atts['type'] ) && ! empty( $linktypes[ $atts['type'] ] ) && ! empty( $atts['href'] ) ) {
502						$providers[ $linktypes[ $atts['type'] ] ] = htmlspecialchars_decode( $atts['href'] );
503
504						// Stop here if it's JSON (that's all we need).
505						if ( 'json' === $linktypes[ $atts['type'] ] ) {
506							break;
507						}
508					}
509				}
510			}
511		}
512
513		// JSON is preferred to XML.
514		if ( ! empty( $providers['json'] ) ) {
515			return $providers['json'];
516		} elseif ( ! empty( $providers['xml'] ) ) {
517			return $providers['xml'];
518		} else {
519			return false;
520		}
521	}
522
523	/**
524	 * Connects to an oEmbed provider and returns the result.
525	 *
526	 * @since 2.9.0
527	 *
528	 * @param string       $provider The URL to the oEmbed provider.
529	 * @param string       $url      The URL to the content that is desired to be embedded.
530	 * @param string|array $args     Optional. Additional arguments for retrieving embed HTML.
531	 *                               See wp_oembed_get() for accepted arguments. Default empty.
532	 * @return object|false The result in the form of an object on success, false on failure.
533	 */
534	public function fetch( $provider, $url, $args = '' ) {
535		$args = wp_parse_args( $args, wp_embed_defaults( $url ) );
536
537		$provider = add_query_arg( 'maxwidth', (int) $args['width'], $provider );
538		$provider = add_query_arg( 'maxheight', (int) $args['height'], $provider );
539		$provider = add_query_arg( 'url', urlencode( $url ), $provider );
540		$provider = add_query_arg( 'dnt', 1, $provider );
541
542		/**
543		 * Filters the oEmbed URL to be fetched.
544		 *
545		 * @since 2.9.0
546		 * @since 4.9.0 The `dnt` (Do Not Track) query parameter was added to all oEmbed provider URLs.
547		 *
548		 * @param string $provider URL of the oEmbed provider.
549		 * @param string $url      URL of the content to be embedded.
550		 * @param array  $args     Optional. Additional arguments for retrieving embed HTML.
551		 *                         See wp_oembed_get() for accepted arguments. Default empty.
552		 */
553		$provider = apply_filters( 'oembed_fetch_url', $provider, $url, $args );
554
555		foreach ( array( 'json', 'xml' ) as $format ) {
556			$result = $this->_fetch_with_format( $provider, $format );
557			if ( is_wp_error( $result ) && 'not-implemented' === $result->get_error_code() ) {
558				continue;
559			}
560
561			return ( $result && ! is_wp_error( $result ) ) ? $result : false;
562		}
563
564		return false;
565	}
566
567	/**
568	 * Fetches result from an oEmbed provider for a specific format and complete provider URL
569	 *
570	 * @since 3.0.0
571	 *
572	 * @param string $provider_url_with_args URL to the provider with full arguments list (url, maxheight, etc.)
573	 * @param string $format                 Format to use.
574	 * @return object|false|WP_Error The result in the form of an object on success, false on failure.
575	 */
576	private function _fetch_with_format( $provider_url_with_args, $format ) {
577		$provider_url_with_args = add_query_arg( 'format', $format, $provider_url_with_args );
578
579		/** This filter is documented in wp-includes/class-wp-oembed.php */
580		$args = apply_filters( 'oembed_remote_get_args', array(), $provider_url_with_args );
581
582		$response = wp_safe_remote_get( $provider_url_with_args, $args );
583
584		if ( 501 === wp_remote_retrieve_response_code( $response ) ) {
585			return new WP_Error( 'not-implemented' );
586		}
587
588		$body = wp_remote_retrieve_body( $response );
589		if ( ! $body ) {
590			return false;
591		}
592
593		$parse_method = "_parse_$format";
594
595		return $this->$parse_method( $body );
596	}
597
598	/**
599	 * Parses a json response body.
600	 *
601	 * @since 3.0.0
602	 *
603	 * @param string $response_body
604	 * @return object|false
605	 */
606	private function _parse_json( $response_body ) {
607		$data = json_decode( trim( $response_body ) );
608
609		return ( $data && is_object( $data ) ) ? $data : false;
610	}
611
612	/**
613	 * Parses an XML response body.
614	 *
615	 * @since 3.0.0
616	 *
617	 * @param string $response_body
618	 * @return object|false
619	 */
620	private function _parse_xml( $response_body ) {
621		if ( ! function_exists( 'libxml_disable_entity_loader' ) ) {
622			return false;
623		}
624
625		if ( PHP_VERSION_ID < 80000 ) {
626			/*
627			 * This function has been deprecated in PHP 8.0 because in libxml 2.9.0, external entity loading
628			 * is disabled by default, so this function is no longer needed to protect against XXE attacks.
629			 */
630			$loader = libxml_disable_entity_loader( true );
631		}
632
633		$errors = libxml_use_internal_errors( true );
634
635		$return = $this->_parse_xml_body( $response_body );
636
637		libxml_use_internal_errors( $errors );
638
639		if ( PHP_VERSION_ID < 80000 && isset( $loader ) ) {
640			// phpcs:ignore PHPCompatibility.FunctionUse.RemovedFunctions.libxml_disable_entity_loaderDeprecated
641			libxml_disable_entity_loader( $loader );
642		}
643
644		return $return;
645	}
646
647	/**
648	 * Serves as a helper function for parsing an XML response body.
649	 *
650	 * @since 3.6.0
651	 *
652	 * @param string $response_body
653	 * @return stdClass|false
654	 */
655	private function _parse_xml_body( $response_body ) {
656		if ( ! function_exists( 'simplexml_import_dom' ) || ! class_exists( 'DOMDocument', false ) ) {
657			return false;
658		}
659
660		$dom     = new DOMDocument();
661		$success = $dom->loadXML( $response_body );
662		if ( ! $success ) {
663			return false;
664		}
665
666		if ( isset( $dom->doctype ) ) {
667			return false;
668		}
669
670		foreach ( $dom->childNodes as $child ) {
671			if ( XML_DOCUMENT_TYPE_NODE === $child->nodeType ) {
672				return false;
673			}
674		}
675
676		$xml = simplexml_import_dom( $dom );
677		if ( ! $xml ) {
678			return false;
679		}
680
681		$return = new stdClass();
682		foreach ( $xml as $key => $value ) {
683			$return->$key = (string) $value;
684		}
685
686		return $return;
687	}
688
689	/**
690	 * Converts a data object from WP_oEmbed::fetch() and returns the HTML.
691	 *
692	 * @since 2.9.0
693	 *
694	 * @param object $data A data object result from an oEmbed provider.
695	 * @param string $url  The URL to the content that is desired to be embedded.
696	 * @return string|false The HTML needed to embed on success, false on failure.
697	 */
698	public function data2html( $data, $url ) {
699		if ( ! is_object( $data ) || empty( $data->type ) ) {
700			return false;
701		}
702
703		$return = false;
704
705		switch ( $data->type ) {
706			case 'photo':
707				if ( empty( $data->url ) || empty( $data->width ) || empty( $data->height ) ) {
708					break;
709				}
710				if ( ! is_string( $data->url ) || ! is_numeric( $data->width ) || ! is_numeric( $data->height ) ) {
711					break;
712				}
713
714				$title  = ! empty( $data->title ) && is_string( $data->title ) ? $data->title : '';
715				$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>';
716				break;
717
718			case 'video':
719			case 'rich':
720				if ( ! empty( $data->html ) && is_string( $data->html ) ) {
721					$return = $data->html;
722				}
723				break;
724
725			case 'link':
726				if ( ! empty( $data->title ) && is_string( $data->title ) ) {
727					$return = '<a href="' . esc_url( $url ) . '">' . esc_html( $data->title ) . '</a>';
728				}
729				break;
730
731			default:
732				$return = false;
733		}
734
735		/**
736		 * Filters the returned oEmbed HTML.
737		 *
738		 * Use this filter to add support for custom data types, or to filter the result.
739		 *
740		 * @since 2.9.0
741		 *
742		 * @param string|false $return The returned oEmbed HTML, or false on failure.
743		 * @param object       $data   A data object result from an oEmbed provider.
744		 * @param string       $url    The URL of the content to be embedded.
745		 */
746		return apply_filters( 'oembed_dataparse', $return, $data, $url );
747	}
748
749	/**
750	 * Strips any new lines from the HTML.
751	 *
752	 * @since 2.9.0 as strip_scribd_newlines()
753	 * @since 3.0.0
754	 *
755	 * @param string|false $html Existing HTML.
756	 * @param object       $data Data object from WP_oEmbed::data2html()
757	 * @param string       $url The original URL passed to oEmbed.
758	 * @return string|false Possibly modified $html.
759	 */
760	public function _strip_newlines( $html, $data, $url ) {
761		if ( ! str_contains( $html, "\n" ) ) {
762			return $html;
763		}
764
765		$count     = 1;
766		$found     = array();
767		$token     = '__PRE__';
768		$search    = array( "\t", "\n", "\r", ' ' );
769		$replace   = array( '__TAB__', '__NL__', '__CR__', '__SPACE__' );
770		$tokenized = str_replace( $search, $replace, $html );
771
772		preg_match_all( '#(<pre[^>]*>.+?</pre>)#i', $tokenized, $matches, PREG_SET_ORDER );
773		foreach ( $matches as $i => $match ) {
774			$tag_html  = str_replace( $replace, $search, $match[0] );
775			$tag_token = $token . $i;
776
777			$found[ $tag_token ] = $tag_html;
778			$html                = str_replace( $tag_html, $tag_token, $html, $count );
779		}
780
781		$replaced = str_replace( $replace, $search, $html );
782		$stripped = str_replace( array( "\r\n", "\n" ), '', $replaced );
783		$pre      = array_values( $found );
784		$tokens   = array_keys( $found );
785
786		return str_replace( $tokens, $pre, $stripped );
787	}
788}
789