jetpack / modules / shortcodes / youtube.php

youtube.php in Jetpack – WP Security, Backup, Speed, & Growth 14.8, at modules/shortcodes/youtube.php

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1	<?php
2	/**
3	* Youtube shortcode
4	*
5	* Contains shortcode + some improvements over the Core Embeds syntax (see http://codex.wordpress.org/Embeds )
6	*
7	* Examples:
8	* [youtube https://www.youtube.com/watch?v=WVbQ-oro7FQ]
9	* [youtube=http://www.youtube.com/watch?v=wq0rXGLs0YM&fs=1&hl=bg_BG&autohide=1&rel=0]
10	* http://www.youtube.com/watch?v=H2Ncxw1xfck&w=320&h=240&fmt=1&rel=0&showsearch=1&hd=0
11	* http://www.youtube.com/v/9FhMMmqzbD8?fs=1&hl=en_US
12	* https://www.youtube.com/playlist?list=PLP7HaNDU4Cifov7C2fQM8Ij6Ew_uPHEXW
13	*
14	* @package automattic/jetpack
15	*/
16
17	/**
18	* Replaces YouTube embeds with YouTube shortcodes.
19	*
20	* Covers the following formats:
21	* 2008-07-15:
22	* <object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/bZBHZT3a-FA&hl=en&fs=1"></param><param name="allowFullScreen" value="true"></param><embed src="http://www.youtube.com/v/bZBHZT3a-FA&hl=en&fs=1" type="application/x-shockwave-flash" allowfullscreen="true" width="425" height="344"></embed></object>
23	* around 2008-06-06 youtube changed their old embed code to this:
24	* <object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/M1D30gS7Z8U&hl=en"></param><embed src="http://www.youtube.com/v/M1D30gS7Z8U&hl=en" type="application/x-shockwave-flash" width="425" height="344"></embed></object>
25	* old style was:
26	* <object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/dGY28Qbj76A&rel=0"></param><param name="wmode" value="transparent"></param><embed src="http://www.youtube.com/v/dGY28Qbj76A&rel=0" type="application/x-shockwave-flash" wmode="transparent" width="425" height="344"></embed></object>
27	* 12-2010:
28	* <object width="640" height="385"><param name="movie" value="http://www.youtube.com/v/3H8bnKdf654?fs=1&hl=en_GB"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/3H8bnKdf654?fs=1&hl=en_GB" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="640" height="385"></embed></object>
29	* 01-2011:
30	* <iframe title="YouTube video player" class="youtube-player" width="640" height="390" src="http://www.youtube.com/embed/Qq9El3ki0_g" frameborder="0" allowFullScreen></iframe>
31	* <iframe class="youtube-player" width="640" height="385" src="http://www.youtube.com/embed/VIDEO_ID" frameborder="0"></iframe>
32	*
33	* @param string $content HTML content.
34	* @return string The content with YouTube embeds replaced with YouTube shortcodes.
35	*/
36	function jetpack_youtube_embed_to_short_code( $content ) {
37	if ( ! is_string( $content ) \|\| ! str_contains( $content, 'youtube.com' ) ) {
38	return $content;
39	}
40
41	// older codes.
42	$regexp = '!<object(.?)>.?<param\s+name=[\'"]movie[\'"]\s+value=[\'"](https?:)?//www\.youtube\.com/v/([^\'"]+)[\'"].?>.?</object>!i';
43	$regexp_ent = htmlspecialchars( $regexp, ENT_NOQUOTES );
44	$old_regexp = '!<embed(?:\s+\w+="[^"]")\s+src="https?(?:\:\|&#058;)//www\.youtube\.com/v/([^"]+)"(?:\s+\w+="[^"]")\s(?:/>\|>\s*</embed>)!';
45	$old_regexp_ent = str_replace( '&#058;', '&#058;\|&#0*58;', htmlspecialchars( $old_regexp, ENT_NOQUOTES ) );
46
47	// new code.
48	$ifr_regexp = '!<iframe((?:\s+\w+="[^"]")?)\s+src="(https?:)?//(?:www\.)youtube.com/embed/([^"]+)".?</iframe>!i';
49	$ifr_regexp_ent = str_replace( '&#058;', '&#058;\|&#0*58;', htmlspecialchars( $ifr_regexp, ENT_NOQUOTES ) );
50
51	foreach ( compact( 'regexp', 'regexp_ent', 'old_regexp', 'old_regexp_ent', 'ifr_regexp', 'ifr_regexp_ent' ) as $reg => $regexp ) {
52	if ( ! preg_match_all( $regexp, $content, $matches, PREG_SET_ORDER ) ) {
53	continue;
54	}
55
56	foreach ( $matches as $match ) {
57	/*
58	* Hack, but '?' should only ever appear once, and
59	* it should be for the 1st field-value pair in query string,
60	* if it is present
61	* YouTube changed their embed code.
62	* Example of how it is now:
63	* <object width="640" height="385"><param name="movie" value="http://www.youtube.com/v/aP9AaD4tgBY?fs=1&hl=en_US"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/aP9AaD4tgBY?fs=1&hl=en_US" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="640" height="385"></embed></object>
64	* As shown at the start of function, previous YouTube didn't '?'
65	* the 1st field-value pair.
66	*/
67	if ( in_array( $reg, array( 'ifr_regexp', 'ifr_regexp_ent', 'regexp', 'regexp_ent' ), true ) ) {
68	$params = $match[1];
69
70	if ( in_array( $reg, array( 'ifr_regexp_ent', 'regexp_ent' ), true ) ) {
71	$params = html_entity_decode( $params, ENT_QUOTES \| ENT_SUBSTITUTE \| ENT_HTML401 );
72	}
73
74	$params = wp_kses_hair( $params, array( 'http' ) );
75
76	$width = isset( $params['width'] ) ? (int) $params['width']['value'] : 0;
77	$height = isset( $params['height'] ) ? (int) $params['height']['value'] : 0;
78	$wh = '';
79
80	if ( $width && $height ) {
81	$wh = "&w=$width&h=$height";
82	}
83
84	$url = esc_url_raw( "https://www.youtube.com/watch?v={$match[3]}{$wh}" );
85	} else {
86	$match[1] = str_replace( '?', '&', $match[1] );
87
88	$url = esc_url_raw( 'https://www.youtube.com/watch?v=' . html_entity_decode( $match[1], ENT_QUOTES \| ENT_SUBSTITUTE \| ENT_HTML401 ) );
89	}
90
91	$content = str_replace( $match[0], "[youtube $url]", $content );
92
93	/**
94	* Fires before the YouTube embed is transformed into a shortcode.
95	*
96	* @module shortcodes
97	*
98	* @since 1.2.0
99	*
100	* @param string youtube Shortcode name.
101	* @param string $url YouTube video URL.
102	*/
103	do_action( 'jetpack_embed_to_shortcode', 'youtube', $url );
104	}
105	}
106
107	return $content;
108	}
109	add_filter( 'pre_kses', 'jetpack_youtube_embed_to_short_code' );
110
111	/**
112	* Replaces plain-text links to YouTube videos with YouTube embeds.
113	*
114	* @param string $content HTML content.
115	*
116	* @return string The content with embeds instead of URLs
117	*/
118	function jetpack_youtube_link( $content ) {
119	return jetpack_preg_replace_callback_outside_tags( '!(?:\n\|\A)https?://(?:www\.)?(?:youtube.com/(?:v/\|playlist\|watch[/\#?])\|youtu\.be/)[^\s]+?(?:\n\|\Z)!i', 'jetpack_youtube_link_callback', $content, 'youtube.com/' );
120	}
121
122	/**
123	* Callback function for the regex that replaces YouTube URLs with
124	* YouTube embeds.
125	*
126	* @param array $matches An array containing a YouTube URL.
127	*/
128	function jetpack_youtube_link_callback( $matches ) {
129	return "\n" . jetpack_youtube_id( $matches[0] ) . "\n";
130	}
131
132	/**
133	* Normalizes a YouTube URL to include a v= parameter and a query string free of encoded ampersands.
134	*
135	* @param string\|array $url Youtube URL.
136	* @return string\|false The normalized URL or false if input is invalid.
137	*/
138	if ( ! function_exists( 'jetpack_youtube_sanitize_url' ) ) :
139	/**
140	* Clean up Youtube URL to match a single format.
141	*
142	* @param string\|array $url Youtube URL.
143	*/
144	function jetpack_youtube_sanitize_url( $url ) {
145	if ( is_array( $url ) && isset( $url['url'] ) ) {
146	$url = $url['url'];
147	}
148	if ( ! is_string( $url ) ) {
149	return false;
150	}
151
152	$url = trim( $url, ' "' );
153	$url = trim( $url );
154	$url = str_replace( array( 'youtu.be/', '/v/', '#!v=', '&', '&', 'playlist' ), array( 'youtu.be/?v=', '/?v=', '?v=', '&', '&', 'videoseries' ), $url );
155
156	// Replace any extra question marks with ampersands - the result of a URL like "https://www.youtube.com/v/dQw4w9WgXcQ?fs=1&hl=en_US" being passed in.
157	$query_string_start = strpos( $url, '?' );
158
159	if ( false !== $query_string_start ) {
160	$url = substr( $url, 0, $query_string_start + 1 ) . str_replace( '?', '&', substr( $url, $query_string_start + 1 ) );
161	}
162
163	return $url;
164	}
165	endif;
166
167	/**
168	* Converts a YouTube URL into an embedded YouTube video.
169	*
170	* URL can be:
171	* http://www.youtube.com/embed/videoseries?list=PL94269DA08231042B&hl=en_US
172	* http://www.youtube.com/watch#!v=H2Ncxw1xfck
173	* http://www.youtube.com/watch?v=H2Ncxw1xfck
174	* http://www.youtube.com/watch?v=H2Ncxw1xfck&w=320&h=240&fmt=1&rel=0&showsearch=1&hd=0
175	* http://www.youtube.com/v/jF-kELmmvgA
176	* http://www.youtube.com/v/9FhMMmqzbD8?fs=1&hl=en_US
177	* http://youtu.be/Rrohlqeir5E
178	* https://www.youtube.com/watch?v=GJNxoe-iSb4&list=PLAVZ4NFtZX0fE54mDSqNKym-o_rz-8xmk
179	*
180	* @param string $url Youtube URL.
181	*/
182	function jetpack_youtube_id( $url ) {
183	$id = jetpack_get_youtube_id( $url );
184
185	if ( ! $id ) {
186	return sprintf( '<!--%s-->', esc_html__( 'YouTube Error: bad URL entered', 'jetpack' ) );
187	}
188
189	$url = jetpack_youtube_sanitize_url( $url );
190	$url = wp_parse_url( $url );
191
192	$thumbnail = "https://i.ytimg.com/vi/$id/hqdefault.jpg";
193	$video_url = add_query_arg( 'v', $id, 'https://www.youtube.com/watch' );
194
195	$args = jetpack_shortcode_youtube_args( $url );
196	if ( empty( $args ) ) {
197	return sprintf( '<!--%s-->', esc_html__( 'YouTube Error: empty URL args', 'jetpack' ) );
198	}
199
200	// Account for URL having both v and list, where jetpack_get_youtube_id() only accounts for one or the other.
201	if ( isset( $args['list'] ) && $args['list'] === $id ) {
202	$id = null;
203	}
204	if ( isset( $args['v'] ) ) {
205	$id = $args['v'];
206	}
207	if ( ! $id && empty( $args['list'] ) ) {
208	return sprintf( '<!--%s-->', esc_html__( 'YouTube Error: missing id and/or list', 'jetpack' ) );
209	}
210
211	list( $w, $h ) = jetpack_shortcode_youtube_dimensions( $args );
212
213	$params = array(
214	'rel' => ( isset( $args['rel'] ) && '0' === $args['rel'] ) ? 0 : 1,
215	'showsearch' => ( isset( $args['showsearch'] ) && '1' === $args['showsearch'] ) ? 1 : 0, // Now deprecated. See https://developers.google.com/youtube/player_parameters#march-29,-2012.
216	'showinfo' => ( isset( $args['showinfo'] ) && '0' === $args['showinfo'] ) ? 0 : 1, // Now obsolete. See https://developers.google.com/youtube/player_parameters#showinfo.
217	'iv_load_policy' => ( isset( $args['iv_load_policy'] ) && '3' === $args['iv_load_policy'] ) ? 3 : 1,
218	'fs' => 1,
219	'hl' => str_replace( '_', '-', get_locale() ),
220	);
221	if ( isset( $args['fmt'] ) && (int) $args['fmt'] ) {
222	$params['fmt'] = (int) $args['fmt']; // Apparently an obsolete parameter. Not referenced on https://developers.google.com/youtube/player_parameters.
223	}
224
225	// The autohide parameter has been deprecated since 2015. See https://developers.google.com/youtube/player_parameters#august-19,-2015.
226	if ( ! isset( $args['autohide'] ) \|\| ( $args['autohide'] < 0 \|\| 2 < $args['autohide'] ) ) {
227	$params['autohide'] = 2;
228	} else {
229	$params['autohide'] = (int) $args['autohide'];
230	}
231
232	$start = 0;
233	if ( isset( $args['start'] ) ) {
234	$start = (int) $args['start'];
235	} elseif ( isset( $args['t'] ) ) {
236	if ( is_numeric( $args['t'] ) ) {
237	$start = (int) $args['t'];
238	} elseif ( is_string( $args['t'] ) ) {
239	$time_pieces = preg_split( '/(?<=\D)(?=\d+)/', $args['t'] );
240
241	foreach ( $time_pieces as $time_piece ) {
242	$int = (int) $time_piece;
243	switch ( substr( $time_piece, - 1 ) ) {
244	case 'h':
245	$start += $int * 3600;
246	break;
247	case 'm':
248	$start += $int * 60;
249	break;
250	case 's':
251	$start += $int;
252	break;
253	}
254	}
255	}
256	}
257	if ( $start ) {
258	$params['start'] = (int) $start;
259	}
260
261	if ( isset( $args['end'] ) && (int) $args['end'] ) {
262	$params['end'] = (int) $args['end'];
263	}
264	if ( isset( $args['hd'] ) && (int) $args['hd'] ) {
265	$params['hd'] = (int) $args['hd']; // Now obsolete per https://developers.google.com/youtube/player_parameters#march-29,-2012.
266	}
267	if ( isset( $args['vq'] ) && in_array( $args['vq'], array( 'hd720', 'hd1080' ), true ) ) {
268	$params['vq'] = $args['vq']; // Note, this appears to be obsolete. Not referenced on https://developers.google.com/youtube/player_parameters.
269	}
270	if ( isset( $args['cc_load_policy'] ) ) {
271	$params['cc_load_policy'] = 1;
272	}
273	if ( isset( $args['cc_lang_pref'] ) ) {
274	$params['cc_lang_pref'] = preg_replace( '/[^_a-z0-9-]/i', '', $args['cc_lang_pref'] );
275	}
276
277	// The wmode parameter appears to be obsolete. Not referenced on https://developers.google.com/youtube/player_parameters.
278	if ( isset( $args['wmode'] ) && in_array( strtolower( $args['wmode'] ), array( 'opaque', 'window', 'transparent' ), true ) ) {
279	$params['wmode'] = $args['wmode'];
280	} else {
281	$params['wmode'] = 'transparent';
282	}
283
284	// The theme parameter is obsolete per https://developers.google.com/youtube/player_parameters#august-19,-2015.
285	if ( isset( $args['theme'] ) && in_array( strtolower( $args['theme'] ), array( 'dark', 'light' ), true ) ) {
286	$params['theme'] = $args['theme'];
287	}
288
289	if ( isset( $args['list'] ) ) {
290	$params['listType'] = 'playlist';
291	$params['list'] = preg_replace( '\|[^_a-z0-9-]\|i', '', $args['list'] );
292	}
293
294	/**
295	* Allow YouTube videos to start playing automatically.
296	*
297	* @module shortcodes
298	*
299	* @since 2.2.2
300	*
301	* @param bool false Enable autoplay for YouTube videos.
302	*/
303	if ( apply_filters( 'jetpack_youtube_allow_autoplay', false ) && isset( $args['autoplay'] ) ) {
304	$params['autoplay'] = (int) $args['autoplay'];
305	}
306
307	$is_amp = class_exists( 'Jetpack_AMP_Support' ) && Jetpack_AMP_Support::is_amp_request();
308
309	if ( $is_amp && $id ) {
310	// Note that <amp-youtube> currently is not well suited for playlists that don't have an individual video selected, hence the $id check above.
311	$placeholder = sprintf(
312	'<a href="%1$s" placeholder><amp-img src="%2$s" alt="%3$s" layout="fill" object-fit="cover"><noscript><img src="%2$s" loading="lazy" decoding="async" alt="%3$s"></noscript></amp-img></a>',
313	esc_url( $video_url ),
314	esc_url( $thumbnail ),
315	esc_attr__( 'YouTube Poster', 'jetpack' ) // Would be preferable to provide YouTube video title, but not available in this non-oEmbed context.
316	);
317
318	$html_attributes = array();
319	foreach ( $params as $param_name => $param_value ) {
320	$html_attributes[] = sprintf(
321	'data-param-%s="%s"',
322	sanitize_key( $param_name ),
323	esc_attr( $param_value )
324	);
325	}
326
327	$html = sprintf(
328	'<amp-youtube data-videoid="%s" %s width="%d" height="%d" layout="responsive">%s</amp-youtube>',
329	esc_attr( $id ),
330	implode( ' ', $html_attributes ), // Note: Escaping done above.
331	esc_attr( $w ),
332	esc_attr( $h ),
333	$placeholder
334	);
335	} else {
336	// In AMP, the AMP_Iframe_Sanitizer will convert into <amp-iframe> as required.
337	$src = 'https://www.youtube.com/embed';
338	if ( $id ) {
339	$src .= "/$id";
340	}
341	$src = add_query_arg(
342	array_merge(
343	array( 'version' => 3 ),
344	$params
345	),
346	$src
347	);
348
349	$layout = $is_amp ? 'layout="responsive" ' : '';
350
351	$html = sprintf(
352	'<iframe class="youtube-player" width="%s" height="%s" %ssrc="%s" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe>',
353	esc_attr( $w ),
354	esc_attr( $h ),
355	$layout,
356	esc_url( $src )
357	);
358	}
359
360	// Let's do some alignment wonder in a span, unless we're producing a feed.
361	if ( ! is_feed() ) {
362	$alignmentcss = 'text-align:center;';
363	if ( isset( $args['align'] ) ) {
364	switch ( $args['align'] ) {
365	case 'left':
366	$alignmentcss = "float:left; width:{$w}px; height:{$h}px; margin-right:10px; margin-bottom: 10px;";
367	break;
368	case 'right':
369	$alignmentcss = "float:right; width:{$w}px; height:{$h}px; margin-left:10px; margin-bottom: 10px;";
370	break;
371	}
372	}
373
374	$html = sprintf(
375	'<span class="embed-youtube" style="%s display: block;">%s</span>',
376	esc_attr( $alignmentcss ),
377	$html
378	);
379
380	}
381
382	/**
383	* Format output for Calypso Reader/Notifications/Comments
384	*/
385	if ( defined( 'IS_WPCOM' ) && IS_WPCOM ) {
386	require_once WP_CONTENT_DIR . '/lib/display-context.php';
387	$context = A8C\Display_Context\get_current_context();
388	if ( A8C\Display_Context\NOTIFICATIONS === $context ) {
389	return sprintf(
390	'<a href="%1$s" target="_blank" rel="noopener noreferrer"><img src="%2$s" alt="%3$s" /></a>',
391	esc_url( $video_url ),
392	esc_url( $thumbnail ),
393	esc_html__( 'YouTube video', 'jetpack' )
394	);
395	}
396	}
397
398	/**
399	* Filter the YouTube video HTML output.
400	*
401	* @module shortcodes
402	*
403	* @since 1.2.3
404	*
405	* @param string $html YouTube video HTML output.
406	*/
407	$html = apply_filters( 'video_embed_html', $html );
408
409	return $html;
410	}
411
412	/**
413	* Gets the args present in the YouTube shortcode URL.
414	*
415	* @since 8.0.0
416	*
417	* @param array $url The parsed URL of the shortcode.
418	*
419	* @return array\|false The query args of the URL, or false.
420	*/
421	function jetpack_shortcode_youtube_args( $url ) {
422	$qargs = array();
423	if ( ! empty( $url['query'] ) ) {
424	wp_parse_str( $url['query'], $qargs );
425	} else {
426	return false;
427	}
428
429	$fargs = array();
430	if ( ! empty( $url['fragment'] ) ) {
431	wp_parse_str( $url['fragment'], $fargs );
432	}
433
434	return array_merge( $fargs, $qargs );
435	}
436
437	/**
438	* Display the Youtube shortcode.
439	*
440	* @param array $atts Shortcode attributes.
441	*
442	* @return string The rendered shortcode.
443	*/
444	function jetpack_youtube_shortcode( $atts ) {
445	$url = ( isset( $atts[0] ) ) ? ltrim( $atts[0], '=' ) : shortcode_new_to_old_params( $atts );
446	return jetpack_youtube_id( $url );
447	}
448	add_shortcode( 'youtube', 'jetpack_youtube_shortcode' );
449
450	/**
451	* Gets the dimensions of the [youtube] shortcode.
452	*
453	* Calculates the width and height, taking $content_width into consideration.
454	*
455	* @since 8.0.0
456	*
457	* @param array $query_args The query args of the URL.
458	*
459	* @return array The width and height of the shortcode.
460	*/
461	function jetpack_shortcode_youtube_dimensions( $query_args ) {
462	$h = null;
463	global $content_width;
464
465	$input_w = ( isset( $query_args['w'] ) && (int) $query_args['w'] ) ? (int) $query_args['w'] : 0;
466	$input_h = ( isset( $query_args['h'] ) && (int) $query_args['h'] ) ? (int) $query_args['h'] : 0;
467
468	// If we have $content_width, use it.
469	if ( ! empty( $content_width ) ) {
470	$default_width = $content_width;
471	} else {
472	// Otherwise get default width from the old, now deprecated embed_size_w option.
473	$default_width = get_option( 'embed_size_w' );
474	}
475
476	// If we don't know those 2 values use a hardcoded width.
477	if ( empty( $default_width ) ) {
478	$default_width = 640;
479	}
480
481	if ( $input_w > 0 && $input_h > 0 ) {
482	$w = $input_w;
483	$h = $input_h;
484	} elseif ( 0 === $input_w && 0 === $input_h ) {
485	if ( isset( $query_args['fmt'] ) && (int) $query_args['fmt'] ) {
486	$w = ( ! empty( $content_width ) ? min( $content_width, 480 ) : 480 );
487	} else {
488	$w = ( ! empty( $content_width ) ? min( $content_width, $default_width ) : $default_width );
489	$h = ceil( ( $w / 16 ) * 9 );
490	}
491	} elseif ( $input_w > 0 ) {
492	$w = $input_w;
493	$h = ceil( ( $w / 16 ) * 9 );
494	} elseif ( isset( $query_args['fmt'] ) && (int) $query_args['fmt'] ) {
495	$w = ( ! empty( $content_width ) ? min( $content_width, 480 ) : 480 );
496	} else {
497	$w = ( ! empty( $content_width ) ? min( $content_width, $default_width ) : $default_width );
498	$h = $input_h;
499	}
500
501	/**
502	* Filter the YouTube player width.
503	*
504	* @module shortcodes
505	*
506	* @since 1.1.0
507	*
508	* @param int $w Width of the YouTube player in pixels.
509	*/
510	$w = (int) apply_filters( 'youtube_width', $w );
511
512	/**
513	* Filter the YouTube player height.
514	*
515	* @module shortcodes
516	*
517	* @since 1.1.0
518	*
519	* @param int $h Height of the YouTube player in pixels.
520	*/
521	$h = (int) apply_filters( 'youtube_height', $h );
522
523	return array( $w, $h );
524	}
525
526	/**
527	* For bare URLs on their own line of the form
528	* http://www.youtube.com/v/9FhMMmqzbD8?fs=1&hl=en_US
529	*
530	* @param array $matches Regex partial matches against the URL passed.
531	* @param array $attr Attributes received in embed response.
532	* @param string $url Requested URL to be embedded.
533	*/
534	function wpcom_youtube_embed_crazy_url( $matches, $attr, $url ) {
535	return jetpack_youtube_id( $url );
536	}
537
538	/**
539	* Get the regex for Youtube URLs.
540	*/
541	function wpcom_youtube_get_regex() {
542	return '#https?://(?:www\.)?(?:youtube.com/(?:v/\|playlist\|watch[/\#?])\|youtu\.be/).*#i';
543	}
544
545	/**
546	* Add a new handler to automatically transform custom Youtube URLs (like playlists) into embeds.
547	*/
548	function wpcom_youtube_embed_crazy_url_init() {
549	if ( ! defined( 'REST_API_REQUEST' ) ) {
550	return;
551	}
552
553	// Register the custom handler to provide the better support for the private video.
554	wp_embed_register_handler( 'wpcom_youtube_embed_crazy_url', wpcom_youtube_get_regex(), 'wpcom_youtube_embed_crazy_url' );
555	}
556	add_action( 'init', 'wpcom_youtube_embed_crazy_url_init' );
557
558	/**
559	* Filters the oEmbed result before any HTTP requests are made for YouTube.
560	*
561	* @since 13.9
562	*
563	* @param null\|string $result The UNSANITIZED (and potentially unsafe) HTML that should be used to embed. Default null.
564	* @param string $url The URL that should be inspected for discovery `<link>` tags.
565	* @param array $args oEmbed remote get arguments.
566	* @return null\|string The UNSANITIZED (and potentially unsafe) HTML that should be used to embed.
567	* Null if the URL does not belong to the current site.
568	*/
569	function wpcom_youtube_filter_pre_oembed_result( $result, $url, $args ) {
570	// Return early if it's not a YouTube URL.
571	if ( ! preg_match( wpcom_youtube_get_regex(), $url, $matches ) ) {
572	return $result;
573	}
574
575	// Try to get the oembed data by the Core's approach.
576	$wp_oembed = _wp_oembed_get_object();
577	$data = $wp_oembed->get_data( $url, $args );
578	if ( $data ) {
579	/** This filter is documented in wp-includes/class-wp-oembed.php */
580	return apply_filters( 'oembed_result', $wp_oembed->data2html( $data, $url ), $url, $args );
581	}
582
583	// Fallback to the custom handler if the oembed result is not found, especially for the private video.
584	return jetpack_youtube_id( $url );
585	}
586	add_filter( 'pre_oembed_result', 'wpcom_youtube_filter_pre_oembed_result', 10, 3 );
587
588	/**
589	* Remove the ending question mark from the video id of the YouTube URL.
590	*
591	* Example: https://www.youtube.com/watch?v=AVAWwXeOyyQ?
592	*
593	* @since 13.9
594	*
595	* @param string $provider URL of the oEmbed provider.
596	* @param string $url URL of the content to be embedded.
597	*
598	* @return string
599	*/
600	function wpcom_youtube_oembed_fetch_url( $provider, $url ) {
601	if ( ! wp_startswith( $provider, 'https://www.youtube.com/oembed' ) ) {
602	return $provider;
603	}
604
605	$parsed = wp_parse_url( $url );
606	if ( ! isset( $parsed['query'] ) ) {
607	return $provider;
608	}
609
610	$query_vars = array();
611	wp_parse_str( $parsed['query'], $query_vars );
612	if ( isset( $query_vars['v'] ) && wp_endswith( $query_vars['v'], '?' ) ) {
613	$url = remove_query_arg( array( 'v' ), $url );
614	$url = add_query_arg( 'v', preg_replace( '/\?$/', '', $query_vars['v'] ), $url );
615	}
616
617	$provider = remove_query_arg( array( 'url' ), $provider );
618	$provider = add_query_arg( 'url', rawurlencode( $url ), $provider );
619
620	return $provider;
621	}
622	add_filter( 'oembed_fetch_url', 'wpcom_youtube_oembed_fetch_url', 10, 2 );
623
624	if (
625	! is_admin()
626	&&
627	/**
628	* Allow oEmbeds in Jetpack's Comment form.
629	*
630	* @module shortcodes
631	*
632	* @since 2.8.0
633	*
634	* @param int $allow_oembed Option to automatically embed all plain text URLs.
635	*/
636	apply_filters( 'jetpack_comments_allow_oembed', true )
637	// No need for this on WordPress.com, this is done for multiple shortcodes at a time there.
638	&& ( ! defined( 'IS_WPCOM' ) \|\| ! IS_WPCOM )
639	) {
640	/*
641	* We attach wp_kses_post to comment_text in default-filters.php with priority of 10 anyway,
642	* so the iframe gets filtered out.
643	* Higher priority because we need it before auto-link and autop get to it.
644	*/
645	add_filter( 'comment_text', 'jetpack_youtube_link', 1 );
646	}
647
648	/**
649	* Core changes to do_shortcode (https://core.trac.wordpress.org/changeset/34747) broke "improper" shortcodes
650	* with the format [shortcode=http://url.com].
651	*
652	* This removes the "=" from the shortcode so it can be parsed.
653	*
654	* @see https://github.com/Automattic/jetpack/issues/3121
655	*
656	* @param string $content HTML content.
657	*/
658	function jetpack_fix_youtube_shortcode_display_filter( $content ) {
659	if ( strpos( $content, '[youtube=' ) !== false ) {
660	$content = preg_replace( '@\[youtube=(.*?)\]@', '[youtube $1]', $content );
661	}
662
663	return $content;
664	}
665	add_filter( 'the_content', 'jetpack_fix_youtube_shortcode_display_filter', 7 );
666