Custom REST API Endpoint: Search Snippets

/**
 * Register a search endpoint for snippets.
 */
add_action( 'rest_api_init', function(): void {
    register_rest_route( 'ifcodif/v1', '/search', array(
        'methods'             => WP_REST_Server::READABLE,
        'callback'            => 'ifci_rest_search_snippets',
        'permission_callback' => '__return_true',
        'args'                => array(
            'q' => array(
                'required'          => true,
                'sanitize_callback' => 'sanitize_text_field',
                'validate_callback' => function( $value ) {
                    return is_string( $value ) && strlen( $value ) >= 2;
                },
            ),
        ),
    ) );
} );

function ifci_rest_search_snippets( WP_REST_Request $request ): WP_REST_Response {
    $query = new WP_Query( array(
        'post_type'      => 'ifci_snippet',
        'posts_per_page' => 10,
        's'              => $request->get_param( 'q' ),
        'no_found_rows'  => true,
    ) );

    $results = array_map( function( WP_Post $post ): array {
        return array(
            'id'      => $post->ID,
            'title'   => $post->post_title,
            'excerpt' => get_the_excerpt( $post ),
            'url'     => get_permalink( $post ),
        );
    }, $query->posts );

    return new WP_REST_Response( $results, 200 );
}