Ticket #44610: nocookie2-header.patch

src/js/_enqueues/wp/custom-header.js

@@ -390 +390 @@
                                 height: this.settings.height,
                                 width: this.settings.width,
                                 videoId: this.settings.videoUrl.match( VIDEO_ID_REGEX )[1],
+                                host: location.protocol + ( ( this.settings.videoUrl.indexOf( 'youtube-nocookie' ) !== -1 ) ? '//www.youtube-nocookie.com' : '//www.youtube.com' ),
                                 events: {
                                         onReady: function( e ) {
                                                 e.target.mute();

src/wp-includes/class-wp-customize-manager.php

@@ -6081 +6081 @@
         public function _validate_external_header_video( $validity, $value ) {
                 $video = sanitize_url( $value );
                 if ( $video ) {
-                        if ( ! preg_match( '#^https?://(?:www\.)?(?:youtube\.com/watch|youtu\.be/)#', $video ) ) {
+                        if ( ! preg_match( '#^https?://(?:www\.)?(?:youtube(?:-nocookie)?\.com/(?:watch|embed)|youtu\.be/)#', $video ) ) {
                                 $validity->add( 'invalid_url', __( 'Please enter a valid YouTube URL.' ) );
                         }
                 }

src/wp-includes/theme.php

@@ -1647 +1647 @@
                 ),
         );
 
-        if ( preg_match( '#^https?://(?:www\.)?(?:youtube\.com/watch|youtu\.be/)#', $video_url ) ) {
+        if ( preg_match( '#^https?://(?:www\.)?(?:youtube(?:-nocookie)?\.com/(?:watch|embed)|youtu\.be/)#', $video_url ) ) {
                 $settings['mimeType'] = 'video/x-youtube';
         } elseif ( ! empty( $video_type['type'] ) ) {
                 $settings['mimeType'] = $video_type['type'];