Editor: Add allowed_blocks field to block registration and REST API

There is a new block.json field called allowedBlocks, added in Gutenberg in https://github.com/WordPress/gutenberg/pull/58262. This adds support for this new field also on the server. 

Props: gziolo, jsnajdr.
Fixes #60403.



Built from https://develop.svn.wordpress.org/trunk@57521


git-svn-id: http://core.svn.wordpress.org/trunk@57022 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/post.php

@@ -2303,6 +2303,7 @@ function get_block_editor_server_block_settings() {
 		'keywords'         => 'keywords',
 		'example'          => 'example',
 		'variations'       => 'variations',
+		'allowed_blocks'   => 'allowedBlocks',
 	);
 
 	foreach ( $block_registry->get_all_registered() as $block_name => $block_type ) {

wp-includes/blocks.php

@@ -327,7 +327,7 @@ function get_block_metadata_i18n_schema() {
  * @since 6.1.0 Added support for `render` field.
  * @since 6.3.0 Added `selectors` field.
  * @since 6.4.0 Added support for `blockHooks` field.
- * @since 6.5.0 Added support for `viewStyle` field.
+ * @since 6.5.0 Added support for `allowedBlocks` and `viewStyle` fields.
  *
  * @param string $file_or_folder Path to the JSON file with metadata definition for
  *                               the block or path to the folder where the `block.json` file is located.
@@ -424,6 +424,7 @@ function register_block_type_from_metadata( $file_or_folder, $args = array() ) {
 		'styles'          => 'styles',
 		'variations'      => 'variations',
 		'example'         => 'example',
+		'allowedBlocks'   => 'allowed_blocks',
 	);
 	$textdomain        = ! empty( $metadata['textdomain'] ) ? $metadata['textdomain'] : null;
 	$i18n_schema       = get_block_metadata_i18n_schema();

wp-includes/class-wp-block-type.php

@@ -68,6 +68,14 @@ class WP_Block_Type {
 	 */
 	public $ancestor = null;
 
+	/**
+	 * Limits which block types can be inserted as children of this block type.
+	 *
+	 * @since 6.5.0
+	 * @var string[]|null
+	 */
+	public $allowed_blocks = null;
+
 	/**
 	 * Block type icon.
 	 *
@@ -303,6 +311,7 @@ class WP_Block_Type {
 	 *                                                   available when nested within the specified blocks.
 	 *     @type string[]|null $ancestor                 Setting ancestor makes a block available only inside the specified
 	 *                                                   block types at any position of the ancestor's block subtree.
+	 *     @type string[]|null $allowed_blocks           Limits which block types can be inserted as children of this block type.
 	 *     @type string|null   $icon                     Block type icon.
 	 *     @type string        $description              A detailed block type description.
 	 *     @type string[]      $keywords                 Additional keywords to produce block type as

wp-includes/rest-api/endpoints/class-wp-rest-block-types-controller.php

@@ -280,6 +280,7 @@ class WP_REST_Block_Types_Controller extends WP_REST_Controller {
 				'keywords',
 				'parent',
 				'ancestor',
+				'allowed_blocks',
 				'provides_context',
 				'uses_context',
 				'selectors',
@@ -723,6 +724,17 @@ class WP_REST_Block_Types_Controller extends WP_REST_Controller {
 					'context'     => array( 'embed', 'view', 'edit' ),
 					'readonly'    => true,
 				),
+				'allowed_blocks'        => array(
+					'description' => __( 'Allowed child block types.' ),
+					'type'        => array( 'array', 'null' ),
+					'items'       => array(
+						'type'    => 'string',
+						'pattern' => self::NAME_PATTERN,
+					),
+					'default'     => null,
+					'context'     => array( 'embed', 'view', 'edit' ),
+					'readonly'    => true,
+				),
 				'keywords'              => $keywords_definition,
 				'example'               => $example_definition,
 				'block_hooks'           => array(

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.5-alpha-57520';
+$wp_version = '6.5-alpha-57521';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.