jetpack / modules / shortcodes / youtube.php

youtube.php in Jetpack – WP Security, Backup, Speed, & Growth 12.4, 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 youtube_embed_to_short_code( $content ) {
37	if ( ! is_string( $content ) \|\| false === strpos( $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', '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 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', '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 youtube_link_callback( $matches ) {
129	return "\n" . 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 $url
136	* @return string The normalized URL
137	*/
138	if ( ! function_exists( 'youtube_sanitize_url' ) ) :
139	/**
140	* Clean up Youtube URL to match a single format.
141	*
142	* @param string $url Youtube URL.
143	*/
144	function youtube_sanitize_url( $url ) {
145	$url = trim( $url, ' "' );
146	$url = trim( $url );
147	$url = str_replace( array( 'youtu.be/', '/v/', '#!v=', '&', '&', 'playlist' ), array( 'youtu.be/?v=', '/?v=', '?v=', '&', '&', 'videoseries' ), $url );
148
149	// Replace any extra question marks with ampersands - the result of a URL like "http://www.youtube.com/v/9FhMMmqzbD8?fs=1&hl=en_US" being passed in.
150	$query_string_start = strpos( $url, '?' );
151
152	if ( false !== $query_string_start ) {
153	$url = substr( $url, 0, $query_string_start + 1 ) . str_replace( '?', '&', substr( $url, $query_string_start + 1 ) );
154	}
155
156	return $url;
157	}
158	endif;
159
160	/**
161	* Converts a YouTube URL into an embedded YouTube video.
162	*
163	* URL can be:
164	* http://www.youtube.com/embed/videoseries?list=PL94269DA08231042B&hl=en_US
165	* http://www.youtube.com/watch#!v=H2Ncxw1xfck
166	* http://www.youtube.com/watch?v=H2Ncxw1xfck
167	* http://www.youtube.com/watch?v=H2Ncxw1xfck&w=320&h=240&fmt=1&rel=0&showsearch=1&hd=0
168	* http://www.youtube.com/v/jF-kELmmvgA
169	* http://www.youtube.com/v/9FhMMmqzbD8?fs=1&hl=en_US
170	* http://youtu.be/Rrohlqeir5E
171	* https://www.youtube.com/watch?v=GJNxoe-iSb4&list=PLAVZ4NFtZX0fE54mDSqNKym-o_rz-8xmk
172	*
173	* @param string $url Youtube URL.
174	*/
175	function youtube_id( $url ) {
176	$id = jetpack_get_youtube_id( $url );
177
178	if ( ! $id ) {
179	return sprintf( '<!--%s-->', esc_html__( 'YouTube Error: bad URL entered', 'jetpack' ) );
180	}
181
182	$url = youtube_sanitize_url( $url );
183	$url = wp_parse_url( $url );
184
185	$thumbnail = "https://i.ytimg.com/vi/$id/hqdefault.jpg";
186	$video_url = add_query_arg( 'v', $id, 'https://www.youtube.com/watch' );
187
188	$args = jetpack_shortcode_youtube_args( $url );
189	if ( empty( $args ) ) {
190	return sprintf( '<!--%s-->', esc_html__( 'YouTube Error: empty URL args', 'jetpack' ) );
191	}
192
193	// Account for URL having both v and list, where jetpack_get_youtube_id() only accounts for one or the other.
194	if ( isset( $args['list'] ) && $args['list'] === $id ) {
195	$id = null;
196	}
197	if ( isset( $args['v'] ) ) {
198	$id = $args['v'];
199	}
200	if ( ! $id && empty( $args['list'] ) ) {
201	return sprintf( '<!--%s-->', esc_html__( 'YouTube Error: missing id and/or list', 'jetpack' ) );
202	}
203
204	list( $w, $h ) = jetpack_shortcode_youtube_dimensions( $args );
205
206	$params = array(
207	'rel' => ( isset( $args['rel'] ) && '0' === $args['rel'] ) ? 0 : 1,
208	'showsearch' => ( isset( $args['showsearch'] ) && '1' === $args['showsearch'] ) ? 1 : 0, // Now deprecated. See https://developers.google.com/youtube/player_parameters#march-29,-2012.
209	'showinfo' => ( isset( $args['showinfo'] ) && '0' === $args['showinfo'] ) ? 0 : 1, // Now obsolete. See https://developers.google.com/youtube/player_parameters#showinfo.
210	'iv_load_policy' => ( isset( $args['iv_load_policy'] ) && '3' === $args['iv_load_policy'] ) ? 3 : 1,
211	'fs' => 1,
212	'hl' => str_replace( '_', '-', get_locale() ),
213	);
214	if ( isset( $args['fmt'] ) && (int) $args['fmt'] ) {
215	$params['fmt'] = (int) $args['fmt']; // Apparently an obsolete parameter. Not referenced on https://developers.google.com/youtube/player_parameters.
216	}
217
218	// The autohide parameter has been deprecated since 2015. See https://developers.google.com/youtube/player_parameters#august-19,-2015.
219	if ( ! isset( $args['autohide'] ) \|\| ( $args['autohide'] < 0 \|\| 2 < $args['autohide'] ) ) {
220	$params['autohide'] = 2;
221	} else {
222	$params['autohide'] = (int) $args['autohide'];
223	}
224
225	$start = 0;
226	if ( isset( $args['start'] ) ) {
227	$start = (int) $args['start'];
228	} elseif ( isset( $args['t'] ) ) {
229	if ( is_numeric( $args['t'] ) ) {
230	$start = (int) $args['t'];
231	} else {
232	$time_pieces = preg_split( '/(?<=\D)(?=\d+)/', $args['t'] );
233
234	foreach ( $time_pieces as $time_piece ) {
235	$int = (int) $time_piece;
236	switch ( substr( $time_piece, - 1 ) ) {
237	case 'h':
238	$start += $int * 3600;
239	break;
240	case 'm':
241	$start += $int * 60;
242	break;
243	case 's':
244	$start += $int;
245	break;
246	}
247	}
248	}
249	}
250	if ( $start ) {
251	$params['start'] = (int) $start;
252	}
253
254	if ( isset( $args['end'] ) && (int) $args['end'] ) {
255	$params['end'] = (int) $args['end'];
256	}
257	if ( isset( $args['hd'] ) && (int) $args['hd'] ) {
258	$params['hd'] = (int) $args['hd']; // Now obsolete per https://developers.google.com/youtube/player_parameters#march-29,-2012.
259	}
260	if ( isset( $args['vq'] ) && in_array( $args['vq'], array( 'hd720', 'hd1080' ), true ) ) {
261	$params['vq'] = $args['vq']; // Note, this appears to be obsolete. Not referenced on https://developers.google.com/youtube/player_parameters.
262	}
263	if ( isset( $args['cc_load_policy'] ) ) {
264	$params['cc_load_policy'] = 1;
265	}
266	if ( isset( $args['cc_lang_pref'] ) ) {
267	$params['cc_lang_pref'] = preg_replace( '/[^_a-z0-9-]/i', '', $args['cc_lang_pref'] );
268	}
269
270	// The wmode parameter appears to be obsolete. Not referenced on https://developers.google.com/youtube/player_parameters.
271	if ( isset( $args['wmode'] ) && in_array( strtolower( $args['wmode'] ), array( 'opaque', 'window', 'transparent' ), true ) ) {
272	$params['wmode'] = $args['wmode'];
273	} else {
274	$params['wmode'] = 'transparent';
275	}
276
277	// The theme parameter is obsolete per https://developers.google.com/youtube/player_parameters#august-19,-2015.
278	if ( isset( $args['theme'] ) && in_array( strtolower( $args['theme'] ), array( 'dark', 'light' ), true ) ) {
279	$params['theme'] = $args['theme'];
280	}
281
282	if ( isset( $args['list'] ) ) {
283	$params['listType'] = 'playlist';
284	$params['list'] = preg_replace( '\|[^_a-z0-9-]\|i', '', $args['list'] );
285	}
286
287	/**
288	* Allow YouTube videos to start playing automatically.
289	*
290	* @module shortcodes
291	*
292	* @since 2.2.2
293	*
294	* @param bool false Enable autoplay for YouTube videos.
295	*/
296	if ( apply_filters( 'jetpack_youtube_allow_autoplay', false ) && isset( $args['autoplay'] ) ) {
297	$params['autoplay'] = (int) $args['autoplay'];
298	}
299
300	$is_amp = class_exists( 'Jetpack_AMP_Support' ) && Jetpack_AMP_Support::is_amp_request();
301
302	if ( $is_amp && $id ) {
303	// Note that <amp-youtube> currently is not well suited for playlists that don't have an individual video selected, hence the $id check above.
304	$placeholder = sprintf(
305	'<a href="%1$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>',
306	esc_url( $video_url ),
307	esc_url( $thumbnail ),
308	esc_attr__( 'YouTube Poster', 'jetpack' ) // Would be preferable to provide YouTube video title, but not available in this non-oEmbed context.
309	);
310
311	$html_attributes = array();
312	foreach ( $params as $param_name => $param_value ) {
313	$html_attributes[] = sprintf(
314	'data-param-%s="%s"',
315	sanitize_key( $param_name ),
316	esc_attr( $param_value )
317	);
318	}
319
320	$html = sprintf(
321	'<amp-youtube data-videoid="%s" %s width="%d" height="%d" layout="responsive">%s</amp-youtube>',
322	esc_attr( $id ),
323	implode( ' ', $html_attributes ), // Note: Escaping done above.
324	esc_attr( $w ),
325	esc_attr( $h ),
326	$placeholder
327	);
328	} else {
329	// In AMP, the AMP_Iframe_Sanitizer will convert into <amp-iframe> as required.
330	$src = 'https://www.youtube.com/embed';
331	if ( $id ) {
332	$src .= "/$id";
333	}
334	$src = add_query_arg(
335	array_merge(
336	array( 'version' => 3 ),
337	$params
338	),
339	$src
340	);
341
342	$layout = $is_amp ? 'layout="responsive" ' : '';
343
344	$html = sprintf(
345	'<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"></iframe>',
346	esc_attr( $w ),
347	esc_attr( $h ),
348	$layout,
349	esc_url( $src )
350	);
351	}
352
353	// Let's do some alignment wonder in a span, unless we're producing a feed.
354	if ( ! is_feed() ) {
355	$alignmentcss = 'text-align:center;';
356	if ( isset( $args['align'] ) ) {
357	switch ( $args['align'] ) {
358	case 'left':
359	$alignmentcss = "float:left; width:{$w}px; height:{$h}px; margin-right:10px; margin-bottom: 10px;";
360	break;
361	case 'right':
362	$alignmentcss = "float:right; width:{$w}px; height:{$h}px; margin-left:10px; margin-bottom: 10px;";
363	break;
364	}
365	}
366
367	$html = sprintf(
368	'<span class="embed-youtube" style="%s display: block;">%s</span>',
369	esc_attr( $alignmentcss ),
370	$html
371	);
372
373	}
374
375	/**
376	* Format output for Calypso Reader/Notifications/Comments
377	*/
378	if ( defined( 'IS_WPCOM' ) && IS_WPCOM ) {
379	require_once WP_CONTENT_DIR . '/lib/display-context.php';
380	$context = A8C\Display_Context\get_current_context();
381	if ( A8C\Display_Context\NOTIFICATIONS === $context ) {
382	return sprintf(
383	'<a href="%1$s" target="_blank" rel="noopener noreferrer"><img src="%2$s" alt="%3$s" /></a>',
384	esc_url( $video_url ),
385	esc_url( $thumbnail ),
386	esc_html__( 'YouTube video', 'jetpack' )
387	);
388	}
389	}
390
391	/**
392	* Filter the YouTube video HTML output.
393	*
394	* @module shortcodes
395	*
396	* @since 1.2.3
397	*
398	* @param string $html YouTube video HTML output.
399	*/
400	$html = apply_filters( 'video_embed_html', $html );
401
402	return $html;
403	}
404
405	/**
406	* Gets the args present in the YouTube shortcode URL.
407	*
408	* @since 8.0.0
409	*
410	* @param array $url The parsed URL of the shortcode.
411	*
412	* @return array\|false The query args of the URL, or false.
413	*/
414	function jetpack_shortcode_youtube_args( $url ) {
415	$qargs = array();
416	if ( ! empty( $url['query'] ) ) {
417	wp_parse_str( $url['query'], $qargs );
418	} else {
419	return false;
420	}
421
422	$fargs = array();
423	if ( ! empty( $url['fragment'] ) ) {
424	wp_parse_str( $url['fragment'], $fargs );
425	}
426
427	return array_merge( $fargs, $qargs );
428	}
429
430	/**
431	* Display the Youtube shortcode.
432	*
433	* @param array $atts Shortcode attributes.
434	*
435	* @return string The rendered shortcode.
436	*/
437	function youtube_shortcode( $atts ) {
438	$url = ( isset( $atts[0] ) ) ? ltrim( $atts[0], '=' ) : shortcode_new_to_old_params( $atts );
439	return youtube_id( $url );
440	}
441	add_shortcode( 'youtube', 'youtube_shortcode' );
442
443	/**
444	* Gets the dimensions of the [youtube] shortcode.
445	*
446	* Calculates the width and height, taking $content_width into consideration.
447	*
448	* @since 8.0.0
449	*
450	* @param array $query_args The query args of the URL.
451	*
452	* @return array The width and height of the shortcode.
453	*/
454	function jetpack_shortcode_youtube_dimensions( $query_args ) {
455	$h = null;
456	global $content_width;
457
458	$input_w = ( isset( $query_args['w'] ) && (int) $query_args['w'] ) ? (int) $query_args['w'] : 0;
459	$input_h = ( isset( $query_args['h'] ) && (int) $query_args['h'] ) ? (int) $query_args['h'] : 0;
460
461	// If we have $content_width, use it.
462	if ( ! empty( $content_width ) ) {
463	$default_width = $content_width;
464	} else {
465	// Otherwise get default width from the old, now deprecated embed_size_w option.
466	$default_width = get_option( 'embed_size_w' );
467	}
468
469	// If we don't know those 2 values use a hardcoded width.
470	if ( empty( $default_width ) ) {
471	$default_width = 640;
472	}
473
474	if ( $input_w > 0 && $input_h > 0 ) {
475	$w = $input_w;
476	$h = $input_h;
477	} elseif ( 0 === $input_w && 0 === $input_h ) {
478	if ( isset( $query_args['fmt'] ) && (int) $query_args['fmt'] ) {
479	$w = ( ! empty( $content_width ) ? min( $content_width, 480 ) : 480 );
480	} else {
481	$w = ( ! empty( $content_width ) ? min( $content_width, $default_width ) : $default_width );
482	$h = ceil( ( $w / 16 ) * 9 );
483	}
484	} elseif ( $input_w > 0 ) {
485	$w = $input_w;
486	$h = ceil( ( $w / 16 ) * 9 );
487	} elseif ( isset( $query_args['fmt'] ) && (int) $query_args['fmt'] ) {
488	$w = ( ! empty( $content_width ) ? min( $content_width, 480 ) : 480 );
489	} else {
490	$w = ( ! empty( $content_width ) ? min( $content_width, $default_width ) : $default_width );
491	$h = $input_h;
492	}
493
494	/**
495	* Filter the YouTube player width.
496	*
497	* @module shortcodes
498	*
499	* @since 1.1.0
500	*
501	* @param int $w Width of the YouTube player in pixels.
502	*/
503	$w = (int) apply_filters( 'youtube_width', $w );
504
505	/**
506	* Filter the YouTube player height.
507	*
508	* @module shortcodes
509	*
510	* @since 1.1.0
511	*
512	* @param int $h Height of the YouTube player in pixels.
513	*/
514	$h = (int) apply_filters( 'youtube_height', $h );
515
516	return array( $w, $h );
517	}
518
519	/**
520	* For bare URLs on their own line of the form
521	* http://www.youtube.com/v/9FhMMmqzbD8?fs=1&hl=en_US
522	*
523	* @param array $matches Regex partial matches against the URL passed.
524	* @param array $attr Attributes received in embed response.
525	* @param array $url Requested URL to be embedded.
526	*/
527	function wpcom_youtube_embed_crazy_url( $matches, $attr, $url ) {
528	return youtube_id( $url );
529	}
530
531	/**
532	* Add a new handler to automatically transform custom Youtube URLs (like playlists) into embeds.
533	*/
534	function wpcom_youtube_embed_crazy_url_init() {
535	wp_embed_register_handler( 'wpcom_youtube_embed_crazy_url', '#https?://(?:www\.)?(?:youtube.com/(?:v/\|playlist\|watch[/\#?])\|youtu\.be/).*#i', 'wpcom_youtube_embed_crazy_url' );
536	}
537	add_action( 'init', 'wpcom_youtube_embed_crazy_url_init' );
538
539	if (
540	! is_admin()
541	/**
542	* Allow oEmbeds in Jetpack's Comment form.
543	*
544	* @module shortcodes
545	*
546	* @since 2.8.0
547	*
548	* @param int $allow_oembed Option to automatically embed all plain text URLs.
549	*/
550	&& apply_filters( 'jetpack_comments_allow_oembed', true )
551	// No need for this on WordPress.com, this is done for multiple shortcodes at a time there.
552	&& ( ! defined( 'IS_WPCOM' ) \|\| ! IS_WPCOM )
553	) {
554	/*
555	* We attach wp_kses_post to comment_text in default-filters.php with priority of 10 anyway,
556	* so the iframe gets filtered out.
557	* Higher priority because we need it before auto-link and autop get to it.
558	*/
559	add_filter( 'comment_text', 'youtube_link', 1 );
560	}
561
562	/**
563	* Core changes to do_shortcode (https://core.trac.wordpress.org/changeset/34747) broke "improper" shortcodes
564	* with the format [shortcode=http://url.com].
565	*
566	* This removes the "=" from the shortcode so it can be parsed.
567	*
568	* @see https://github.com/Automattic/jetpack/issues/3121
569	*
570	* @param string $content HTML content.
571	*/
572	function jetpack_fix_youtube_shortcode_display_filter( $content ) {
573	if ( strpos( $content, '[youtube=' ) !== false ) {
574	$content = preg_replace( '@\[youtube=(.*?)\]@', '[youtube $1]', $content );
575	}
576
577	return $content;
578	}
579	add_filter( 'the_content', 'jetpack_fix_youtube_shortcode_display_filter', 7 );
580