* around 2008-06-06 youtube changed their old embed code to this:
*
* old style was:
*
* 12-2010:
*
* 01-2011:
*
*
*
* @param string $content HTML content.
* @return string The content with YouTube embeds replaced with YouTube shortcodes.
*/
function youtube_embed_to_short_code( $content ) {
if ( ! is_string( $content ) || false === strpos( $content, 'youtube.com' ) ) {
return $content;
}
// older codes.
$regexp = '!.*?.*?!i';
$regexp_ent = htmlspecialchars( $regexp, ENT_NOQUOTES );
$old_regexp = '!|>\s*)!';
$old_regexp_ent = str_replace( '�*58;', '�*58;|�*58;', htmlspecialchars( $old_regexp, ENT_NOQUOTES ) );
// new code.
$ifr_regexp = '!!i';
$ifr_regexp_ent = str_replace( '�*58;', '�*58;|�*58;', htmlspecialchars( $ifr_regexp, ENT_NOQUOTES ) );
foreach ( compact( 'regexp', 'regexp_ent', 'old_regexp', 'old_regexp_ent', 'ifr_regexp', 'ifr_regexp_ent' ) as $reg => $regexp ) {
if ( ! preg_match_all( $regexp, $content, $matches, PREG_SET_ORDER ) ) {
continue;
}
foreach ( $matches as $match ) {
/*
* Hack, but '?' should only ever appear once, and
* it should be for the 1st field-value pair in query string,
* if it is present
* YouTube changed their embed code.
* Example of how it is now:
*
* As shown at the start of function, previous YouTube didn't '?'
* the 1st field-value pair.
*/
if ( in_array( $reg, array( 'ifr_regexp', 'ifr_regexp_ent', 'regexp', 'regexp_ent' ), true ) ) {
$params = $match[1];
if ( in_array( $reg, array( 'ifr_regexp_ent', 'regexp_ent' ), true ) ) {
$params = html_entity_decode( $params );
}
$params = wp_kses_hair( $params, array( 'http' ) );
$width = isset( $params['width'] ) ? (int) $params['width']['value'] : 0;
$height = isset( $params['height'] ) ? (int) $params['height']['value'] : 0;
$wh = '';
if ( $width && $height ) {
$wh = "&w=$width&h=$height";
}
$url = esc_url_raw( "https://www.youtube.com/watch?v={$match[3]}{$wh}" );
} else {
$match[1] = str_replace( '?', '&', $match[1] );
$url = esc_url_raw( 'https://www.youtube.com/watch?v=' . html_entity_decode( $match[1] ) );
}
$content = str_replace( $match[0], "[youtube $url]", $content );
/**
* Fires before the YouTube embed is transformed into a shortcode.
*
* @module shortcodes
*
* @since 1.2.0
*
* @param string youtube Shortcode name.
* @param string $url YouTube video URL.
*/
do_action( 'jetpack_embed_to_shortcode', 'youtube', $url );
}
}
return $content;
}
add_filter( 'pre_kses', 'youtube_embed_to_short_code' );
/**
* Replaces plain-text links to YouTube videos with YouTube embeds.
*
* @param string $content HTML content.
*
* @return string The content with embeds instead of URLs
*/
function youtube_link( $content ) {
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/' );
}
/**
* Callback function for the regex that replaces YouTube URLs with
* YouTube embeds.
*
* @param array $matches An array containing a YouTube URL.
*/
function youtube_link_callback( $matches ) {
return "\n" . youtube_id( $matches[0] ) . "\n";
}
/**
* Normalizes a YouTube URL to include a v= parameter and a query string free of encoded ampersands.
*
* @param string $url
* @return string The normalized URL
*/
if ( ! function_exists( 'youtube_sanitize_url' ) ) :
/**
* Clean up Youtube URL to match a single format.
*
* @param string $url Youtube URL.
*/
function youtube_sanitize_url( $url ) {
$url = trim( $url, ' "' );
$url = trim( $url );
$url = str_replace( array( 'youtu.be/', '/v/', '#!v=', '&', '&', 'playlist' ), array( 'youtu.be/?v=', '/?v=', '?v=', '&', '&', 'videoseries' ), $url );
// 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.
$query_string_start = strpos( $url, '?' );
if ( false !== $query_string_start ) {
$url = substr( $url, 0, $query_string_start + 1 ) . str_replace( '?', '&', substr( $url, $query_string_start + 1 ) );
}
return $url;
}
endif;
/**
* Converts a YouTube URL into an embedded YouTube video.
*
* URL can be:
* http://www.youtube.com/embed/videoseries?list=PL94269DA08231042B&hl=en_US
* http://www.youtube.com/watch#!v=H2Ncxw1xfck
* http://www.youtube.com/watch?v=H2Ncxw1xfck
* http://www.youtube.com/watch?v=H2Ncxw1xfck&w=320&h=240&fmt=1&rel=0&showsearch=1&hd=0
* http://www.youtube.com/v/jF-kELmmvgA
* http://www.youtube.com/v/9FhMMmqzbD8?fs=1&hl=en_US
* http://youtu.be/Rrohlqeir5E
*
* @param string $url Youtube URL.
*/
function youtube_id( $url ) {
$id = jetpack_get_youtube_id( $url );
if ( ! $id ) {
return sprintf( '', esc_html__( 'YouTube Error: bad URL entered', 'jetpack' ) );
}
$url = youtube_sanitize_url( $url );
$url = wp_parse_url( $url );
$args = jetpack_shortcode_youtube_args( $url );
if ( empty( $args ) ) {
return sprintf( '', esc_html__( 'YouTube Error: empty URL args', 'jetpack' ) );
}
list( $w, $h ) = jetpack_shortcode_youtube_dimensions( $args );
$rel = ( isset( $args['rel'] ) && '0' === $args['rel'] ) ? 0 : 1;
$search = ( isset( $args['showsearch'] ) && '1' === $args['showsearch'] ) ? 1 : 0;
$info = ( isset( $args['showinfo'] ) && '0' === $args['showinfo'] ) ? 0 : 1;
$iv = ( isset( $args['iv_load_policy'] ) && '3' === $args['iv_load_policy'] ) ? 3 : 1;
$fmt = ( isset( $args['fmt'] ) && intval( $args['fmt'] ) ) ? '&fmt=' . (int) $args['fmt'] : '';
if ( ! isset( $args['autohide'] ) || ( $args['autohide'] < 0 || 2 < $args['autohide'] ) ) {
$autohide = '&autohide=2';
} else {
$autohide = '&autohide=' . absint( $args['autohide'] );
}
$start = 0;
if ( isset( $args['start'] ) ) {
$start = intval( $args['start'] );
} elseif ( isset( $args['t'] ) ) {
$time_pieces = preg_split( '/(?<=\D)(?=\d+)/', $args['t'] );
foreach ( $time_pieces as $time_piece ) {
$int = (int) $time_piece;
switch ( substr( $time_piece, -1 ) ) {
case 'h':
$start += $int * 3600;
break;
case 'm':
$start += $int * 60;
break;
case 's':
$start += $int;
break;
}
}
}
$start = $start ? '&start=' . $start : '';
$end = ( isset( $args['end'] ) && intval( $args['end'] ) ) ? '&end=' . (int) $args['end'] : '';
$hd = ( isset( $args['hd'] ) && intval( $args['hd'] ) ) ? '&hd=' . (int) $args['hd'] : '';
$vq = ( isset( $args['vq'] ) && in_array( $args['vq'], array( 'hd720', 'hd1080' ), true ) ) ? '&vq=' . $args['vq'] : '';
$cc = ( isset( $args['cc_load_policy'] ) ) ? '&cc_load_policy=1' : '';
$cc_lang = ( isset( $args['cc_lang_pref'] ) ) ? '&cc_lang_pref=' . preg_replace( '/[^_a-z0-9-]/i', '', $args['cc_lang_pref'] ) : '';
$wmode = ( isset( $args['wmode'] ) && in_array( strtolower( $args['wmode'] ), array( 'opaque', 'window', 'transparent' ), true ) ) ? $args['wmode'] : 'transparent';
$theme = ( isset( $args['theme'] ) && in_array( strtolower( $args['theme'] ), array( 'dark', 'light' ), true ) ) ? '&theme=' . $args['theme'] : '';
$autoplay = '';
/**
* Allow YouTube videos to start playing automatically.
*
* @module shortcodes
*
* @since 2.2.2
*
* @param bool false Enable autoplay for YouTube videos.
*/
if ( apply_filters( 'jetpack_youtube_allow_autoplay', false ) && isset( $args['autoplay'] ) ) {
$autoplay = '&autoplay=' . (int) $args['autoplay'];
}
if (
( isset( $url['path'] ) && '/videoseries' === $url['path'] )
|| isset( $args['list'] )
) {
$html = "";
} else {
$html = "";
}
// Let's do some alignment wonder in a span, unless we're producing a feed.
if ( ! is_feed() ) {
$alignmentcss = 'text-align:center;';
if ( isset( $args['align'] ) ) {
switch ( $args['align'] ) {
case 'left':
$alignmentcss = "float:left; width:{$w}px; height:{$h}px; margin-right:10px; margin-bottom: 10px;";
break;
case 'right':
$alignmentcss = "float:right; width:{$w}px; height:{$h}px; margin-left:10px; margin-bottom: 10px;";
break;
}
}
$html = sprintf(
'%s',
esc_attr( $alignmentcss ),
$html
);
}
/**
* Filter the YouTube video HTML output.
*
* @module shortcodes
*
* @since 1.2.3
*
* @param string $html YouTube video HTML output.
*/
$html = apply_filters( 'video_embed_html', $html );
return $html;
}
/**
* Gets the args present in the YouTube shortcode URL.
*
* @since 8.0.0
*
* @param string $url The URL of the shortcode.
*
* @return array|false The query args of the URL, or false.
*/
function jetpack_shortcode_youtube_args( $url ) {
$qargs = array();
if ( ! empty( $url['query'] ) ) {
wp_parse_str( $url['query'], $qargs );
} else {
return false;
}
$fargs = array();
if ( ! empty( $url['fragment'] ) ) {
wp_parse_str( $url['fragment'], $fargs );
}
return array_merge( $fargs, $qargs );
}
/**
* Display the Youtube shortcode.
*
* @param array $atts Shortcode attributes.
*
* @return string The rendered shortcode.
*/
function youtube_shortcode( $atts ) {
$url = ( isset( $atts[0] ) ) ? ltrim( $atts[0], '=' ) : shortcode_new_to_old_params( $atts );
if (
class_exists( 'Jetpack_AMP_Support' )
&& Jetpack_AMP_Support::is_amp_request()
) {
return jetpack_amp_youtube_shortcode( $url );
} else {
return youtube_id( $url );
}
}
add_shortcode( 'youtube', 'youtube_shortcode' );
/**
* Renders the [youtube] shortcode as an AMP component.
*
* @since 8.0.0
*
* @param string $url The YouTube URL.
*
* @return string The AMP-compatible rendered shortcode.
*/
function jetpack_amp_youtube_shortcode( $url ) {
$video_id = jetpack_get_youtube_id( $url );
if ( empty( $video_id ) ) {
return sprintf(
'%1$s',
esc_url( $url )
);
}
$sanitized_url = youtube_sanitize_url( $url );
$parsed_url = wp_parse_url( $sanitized_url );
$args = jetpack_shortcode_youtube_args( $parsed_url );
list( $width, $height ) = jetpack_shortcode_youtube_dimensions( $args );
return sprintf(
'',
esc_attr( $video_id ),
absint( $width ),
absint( $height )
);
}
/**
* Gets the dimensions of the [youtube] shortcode.
*
* Calculates the width and height, taking $content_width into consideration.
*
* @since 8.0.0
*
* @param array $query_args The query args of the URL.
*
* @return array The width and height of the shortcode.
*/
function jetpack_shortcode_youtube_dimensions( $query_args ) {
global $content_width;
$input_w = ( isset( $query_args['w'] ) && intval( $query_args['w'] ) ) ? intval( $query_args['w'] ) : 0;
$input_h = ( isset( $query_args['h'] ) && intval( $query_args['h'] ) ) ? intval( $query_args['h'] ) : 0;
// If we have $content_width, use it.
if ( ! empty( $content_width ) ) {
$default_width = $content_width;
} else {
// Otherwise get default width from the old, now deprecated embed_size_w option.
$default_width = get_option( 'embed_size_w' );
}
// If we don't know those 2 values use a hardcoded width.
if ( empty( $default_width ) ) {
$default_width = 640;
}
if ( $input_w > 0 && $input_h > 0 ) {
$w = $input_w;
$h = $input_h;
} elseif ( 0 === $input_w && 0 === $input_h ) {
if ( isset( $query_args['fmt'] ) && intval( $query_args['fmt'] ) ) {
$w = ( ! empty( $content_width ) ? min( $content_width, 480 ) : 480 );
} else {
$w = ( ! empty( $content_width ) ? min( $content_width, $default_width ) : $default_width );
$h = ceil( ( $w / 16 ) * 9 );
}
} elseif ( $input_w > 0 ) {
$w = $input_w;
$h = ceil( ( $w / 16 ) * 9 );
} else {
if ( isset( $query_args['fmt'] ) && intval( $query_args['fmt'] ) ) {
$w = ( ! empty( $content_width ) ? min( $content_width, 480 ) : 480 );
} else {
$w = ( ! empty( $content_width ) ? min( $content_width, $default_width ) : $default_width );
$h = $input_h;
}
}
/**
* Filter the YouTube player width.
*
* @module shortcodes
*
* @since 1.1.0
*
* @param int $w Width of the YouTube player in pixels.
*/
$w = (int) apply_filters( 'youtube_width', $w );
/**
* Filter the YouTube player height.
*
* @module shortcodes
*
* @since 1.1.0
*
* @param int $h Height of the YouTube player in pixels.
*/
$h = (int) apply_filters( 'youtube_height', $h );
return array( $w, $h );
}
/**
* For bare URLs on their own line of the form
* http://www.youtube.com/v/9FhMMmqzbD8?fs=1&hl=en_US
*
* @param array $matches Regex partial matches against the URL passed.
* @param array $attr Attributes received in embed response.
* @param array $url Requested URL to be embedded.
*/
function wpcom_youtube_embed_crazy_url( $matches, $attr, $url ) {
return youtube_id( $url );
}
/**
* Add a new handler to automatically transform custom Youtube URLs (like playlists) into embeds.
*/
function wpcom_youtube_embed_crazy_url_init() {
wp_embed_register_handler( 'wpcom_youtube_embed_crazy_url', '#https?://(?:www\.)?(?:youtube.com/(?:v/|playlist|watch[/\#?])|youtu\.be/).*#i', 'wpcom_youtube_embed_crazy_url' );
}
add_action( 'init', 'wpcom_youtube_embed_crazy_url_init' );
/**
* Allow oEmbeds in Jetpack's Comment form.
*
* @module shortcodes
*
* @since 2.8.0
*
* @param int get_option('embed_autourls') Option to automatically embed all plain text URLs.
*/
if ( ! is_admin() && apply_filters( 'jetpack_comments_allow_oembed', true ) ) {
/*
* We attach wp_kses_post to comment_text in default-filters.php with priority of 10 anyway,
* so the iframe gets filtered out.
* Higher priority because we need it before auto-link and autop get to it.
*/
add_filter( 'comment_text', 'youtube_link', 1 );
}
/**
* Core changes to do_shortcode (https://core.trac.wordpress.org/changeset/34747) broke "improper" shortcodes
* with the format [shortcode=http://url.com].
*
* This removes the "=" from the shortcode so it can be parsed.
*
* @see https://github.com/Automattic/jetpack/issues/3121
*
* @param string $content HTML content.
*/
function jetpack_fix_youtube_shortcode_display_filter( $content ) {
if ( strpos( $content, '[youtube=' ) !== false ) {
$content = preg_replace( '@\[youtube=(.*?)\]@', '[youtube $1]', $content );
}
return $content;
}
add_filter( 'the_content', 'jetpack_fix_youtube_shortcode_display_filter', 7 );