inner_blocks ) ) {
foreach ( $block->inner_blocks as $inner_block ) {
if ( 'core/playlist-track' === $inner_block->name ) {
$inner_block->context['playlistId'] = $playlist_id;
$track_attributes = $inner_block->attributes;
$unique_id = $track_attributes['uniqueId'] ?? wp_unique_id( 'playlist-track-' );
$playlist_tracks[] = $unique_id;
$inner_block->attributes['uniqueId'] = $unique_id;
// Extract track metadata from block attributes.
$title = isset( $track_attributes['title'] ) && ! empty( $track_attributes['title'] ) ? $track_attributes['title'] : __( 'Unknown title' );
$artist = $track_attributes['artist'] ?? '';
$album = $track_attributes['album'] ?? '';
$image = $track_attributes['image'] ?? '';
$url = $track_attributes['src'] ?? '';
$aria_label = $title;
if ( $title && $artist && $album ) {
$aria_label = sprintf(
/* translators: %1$s: track title, %2$s artist name, %3$s: album name. */
_x( '%1$s by %2$s from the album %3$s', 'track title, artist name, album name' ),
$title,
$artist,
$album
);
}
// Data is passed to wp_interactivity_state() which JSON-encodes it,
// so we use wp_strip_all_tags() instead of esc_html() to prevent
// HTML injection without double-encoding. URLs still use esc_url().
$tracks_data[ $unique_id ] = array(
'url' => esc_url( $url ),
'title' => wp_strip_all_tags( $title ),
'artist' => wp_strip_all_tags( $artist ),
'album' => wp_strip_all_tags( $album ),
'image' => esc_url( $image ),
'ariaLabel' => wp_strip_all_tags( $aria_label ),
);
if ( $unique_id === $current_media_id ) {
$current_unique_id = $unique_id;
}
}
}
}
// If there are no tracks but there is a currentTrack set, do not render the block.
// This can happen for example if the currentTrack was not deleted correctly
// or if the block is manually edited in the code editor mode.
if ( empty( $playlist_tracks ) || ! in_array( $current_media_id, $playlist_tracks, true ) ) {
return '';
}
wp_enqueue_script_module( '@wordpress/block-library/playlist/view' );
// Add the playlist tracks to the global state,
// but keep them isolated from other playlists with the help of playlistId.
wp_interactivity_state(
'core/playlist',
array(
'playlists' => array(
$playlist_id => array(
'tracks' => $tracks_data,
),
),
)
);
// Add waveform player container with translated button labels.
$label_play = esc_attr__( 'Play' );
$label_pause = esc_attr__( 'Pause' );
$html = '';
// Add the HTML for the current track inside the figure.
$figure = null;
preg_match( '/]*>/', $content, $figure );
if ( ! empty( $figure[0] ) ) {
$content = preg_replace( '/(]*>)/', '$1' . $html, $content, 1 );
}
$processor = new WP_HTML_Tag_Processor( $content );
$processor->next_tag( 'figure' );
$processor->set_attribute( 'data-wp-interactive', 'core/playlist' );
$processor->set_attribute(
'data-wp-context',
json_encode(
array(
'playlistId' => $playlist_id,
'currentId' => $current_unique_id,
'tracks' => $playlist_tracks,
)
)
);
return $processor->get_updated_html();
}
/**
* Registers the `core/playlist` block on server.
*
* @since 6.9.0
*/
function register_block_core_playlist() {
register_block_type_from_metadata(
__DIR__ . '/playlist',
array(
'render_callback' => 'render_block_core_playlist',
)
);
}
add_action( 'init', 'register_block_core_playlist' );