WordPress/wp-includes/block-patterns.php

<?php
/**
 * Register the block patterns and block patterns categories
 *
 * @package WordPress
 * @since 5.5.0
 */

add_theme_support( 'core-block-patterns' );

/**
 * Registers the core block patterns and categories.
 *
 * @since 5.5.0
 * @private
 */
function _register_core_block_patterns_and_categories() {
	$should_register_core_patterns = get_theme_support( 'core-block-patterns' );

	if ( $should_register_core_patterns ) {
		$core_block_patterns = array(
			'query-standard-posts',
			'query-medium-posts',
			'query-small-posts',
			'query-grid-posts',
			'query-large-title-posts',
			'query-offset-posts',
			'social-links-shared-background-color',
		);

		foreach ( $core_block_patterns as $core_block_pattern ) {
			register_block_pattern(
				'core/' . $core_block_pattern,
				require __DIR__ . '/block-patterns/' . $core_block_pattern . '.php'
			);
		}
	}

	register_block_pattern_category( 'buttons', array( 'label' => _x( 'Buttons', 'Block pattern category' ) ) );
	register_block_pattern_category( 'columns', array( 'label' => _x( 'Columns', 'Block pattern category' ) ) );
	register_block_pattern_category( 'gallery', array( 'label' => _x( 'Gallery', 'Block pattern category' ) ) );
	register_block_pattern_category( 'header', array( 'label' => _x( 'Headers', 'Block pattern category' ) ) );
	register_block_pattern_category( 'text', array( 'label' => _x( 'Text', 'Block pattern category' ) ) );
	register_block_pattern_category( 'query', array( 'label' => __( 'Query', 'Block pattern category' ) ) );
}

/**
 * Import patterns from wordpress.org/patterns.
 */
function _load_remote_block_patterns( $current_screen ) {
	if ( ! $current_screen->is_block_editor ) {
		return;
	}

	$supports_core_patterns = get_theme_support( 'core-block-patterns' );

	/**
	 * Filter to disable remote block patterns.
	 *
	 * @since 5.8.0
	 *
	 * @param bool $should_load_remote
	 */
	$should_load_remote = apply_filters( 'should_load_remote_block_patterns', true );

	if ( $supports_core_patterns && $should_load_remote ) {
		$patterns = get_transient( 'wp_remote_block_patterns' );
		if ( ! $patterns ) {
			$request         = new WP_REST_Request( 'GET', '/wp/v2/pattern-directory/patterns' );
			$core_keyword_id = 11; // 11 is the ID for "core".
			$request->set_param( 'keyword', $core_keyword_id );
			$response = rest_do_request( $request );
			if ( $response->is_error() ) {
				return;
			}
			$patterns = $response->get_data();
			set_transient( 'wp_remote_block_patterns', $patterns, HOUR_IN_SECONDS );
		}

		foreach ( $patterns as $settings ) {
			$pattern_name = 'core/' . sanitize_title( $settings['title'] );
			register_block_pattern( $pattern_name, (array) $settings );
		}
	}
}