Register 'lock' attribute for every block on the server

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

@@ -204,6 +204,16 @@ class WP_Block_Type {
 	 */
 	public $style = null;
 
+	/**
+	 * Attributes supported by every block.
+	 *
+	 * @since 6.0.0
+	 * @var array
+	 */
+	const GLOBAL_ATTRIBUTES = array(
+		'lock' => array( 'type' => 'object' ),
+	);
+
 	/**
 	 * Constructor.
 	 *
@@ -355,6 +365,18 @@ public function set_props( $args ) {
 
 		$args['name'] = $this->name;
 
+		// Setup attributes if needed.
+		if ( ! isset( $args['attributes'] ) || ! is_array( $args['attributes'] ) ) {
+			$args['attributes'] = array();
+		}
+
+		// Register core attributes.
+		foreach ( static::GLOBAL_ATTRIBUTES as $attr_key => $attr_schema ) {
+			if ( ! array_key_exists( $attr_key, $args['attributes'] ) ) {
+				$args['attributes'][ $attr_key ] = $attr_schema;
+			}
+		}
+
 		/**
 		 * Filters the arguments for registering a block type.
 		 *

tests/phpunit/tests/admin/includesPost.php

@@ -844,6 +844,9 @@ public function test_get_block_editor_server_block_settings() {
 				'title'       => '',
 				'description' => '',
 				'icon'        => 'text',
+				'attributes'  => array(
+					'lock' => array( 'type' => 'object' ),
+				),
 				'usesContext' => array(),
 				'category'    => 'common',
 				'styles'      => array(),

tests/phpunit/tests/blocks/register.php

@@ -392,6 +392,7 @@ public function test_block_registers_with_metadata_fixture() {
 					'source'   => 'html',
 					'selector' => '.message',
 				),
+				'lock'    => array( 'type' => 'object' ),
 			),
 			$result->attributes
 		);

tests/phpunit/tests/blocks/wpBlock.php

@@ -82,8 +82,14 @@ public function test_constructor_assigns_block_type_from_registry() {
 		$block        = new WP_Block( $parsed_block, $context, $this->registry );
 
 		$this->assertInstanceOf( WP_Block_Type::class, $block->block_type );
-		$this->assertSame(
-			$block_type_settings['attributes'],
+		$this->assertSameSetsWithIndex(
+			array(
+				'defaulted' => array(
+					'type'    => 'number',
+					'default' => 10,
+				),
+				'lock'      => array( 'type' => 'object' ),
+			),
 			$block->block_type->attributes
 		);
 	}

tests/phpunit/tests/blocks/wpBlockType.php

@@ -84,6 +84,46 @@ public function test_set_props() {
 		$this->assertSame( $args['foo'], $block_type->foo );
 	}
 
+	/*
+	 * @ticket 55567
+	 * @covers WP_Block_Type::set_props
+	 */
+	public function test_core_attributes() {
+		$block_type = new WP_Block_Type( 'core/fake', array() );
+
+		$this->assertSameSetsWithIndex(
+			array(
+				'lock' => array( 'type' => 'object' ),
+			),
+			$block_type->attributes
+		);
+	}
+
+	/*
+	 * @ticket 55567
+	 * @covers WP_Block_Type::set_props
+	 */
+	public function test_core_attributes_matches_custom() {
+		$block_type = new WP_Block_Type(
+			'core/fake',
+			array(
+				'attributes' => array(
+					'lock' => array(
+						'type' => 'string',
+					),
+				),
+			)
+		);
+
+		// Backward compatibility: Don't override attributes with the same name.
+		$this->assertSameSetsWithIndex(
+			array(
+				'lock' => array( 'type' => 'string' ),
+			),
+			$block_type->attributes
+		);
+	}
+
 	/**
 	 * @ticket 45097
 	 */

tests/phpunit/tests/rest-api/rest-block-type-controller.php

@@ -243,7 +243,12 @@ public function test_get_item_invalid() {
 		$this->assertNull( $data['editor_style'] );
 		$this->assertNull( $data['style'] );
 		$this->assertSameSets( array(), $data['provides_context'] );
-		$this->assertSameSets( array(), $data['attributes'] );
+		$this->assertSameSetsWithIndex(
+			array(
+				'lock' => array( 'type' => 'object' ),
+			),
+			$data['attributes']
+		);
 		$this->assertSameSets( array( 'invalid_uses_context' ), $data['uses_context'] );
 		$this->assertSameSets( array( 'invalid_keywords' ), $data['keywords'] );
 		$this->assertSameSets( array( 'invalid_parent' ), $data['parent'] );
@@ -299,7 +304,12 @@ public function test_get_item_defaults() {
 		$this->assertNull( $data['view_script'] );
 		$this->assertNull( $data['editor_style'] );
 		$this->assertNull( $data['style'] );
-		$this->assertSameSets( array(), $data['attributes'] );
+		$this->assertSameSetsWithIndex(
+			array(
+				'lock' => array( 'type' => 'object' ),
+			),
+			$data['attributes']
+		);
 		$this->assertSameSets( array(), $data['provides_context'] );
 		$this->assertSameSets( array(), $data['uses_context'] );
 		$this->assertSameSets( array(), $data['keywords'] );