Plugin PHP restrict content block

plugin-restrict-content-block.php

<?php
/**
 * @author      Jesús Olazagoitia (@goiblas)
 * @license     GPL2+
 *
 * @wordpress-plugin
 * Plugin Name: Block Restrict Content
 * Version:     1.0.0
 * Author:      Jesús Olazagoitia
 * Author URI:  https://goiblas.com
 * License:     GPL2+
 * License URI: http://www.gnu.org/licenses/gpl-2.0.html
 */

defined('ABSPATH') || exit;

function block_restrict_content_register_block() {

	wp_register_script(
		'block_restrict_content',
		plugins_url( 'build/index.js', __FILE__ ),
		array( 'wp-blocks', 'wp-element', 'wp-editor', 'wp-components' ),
		filemtime( plugin_dir_path( __FILE__ ) . 'build/index.js' )
	);

global $wp_roles;
$all_roles = array_values($wp_roles->get_names());

register_block_type( 'block-restrict-content/block-restrict-content', array(
	'editor_script' => 'block_restrict_content',
	'render_callback' =>  'block_restrict_content_render',
	'attributes' => [
		'rolesSelected' => [
			'type' => 'array',
			'default' => [ $all_roles[0] ]
		],
		'roles'  => [
			'type'  => 'array',
			'default' => $all_roles
		]
	]
	) );
}

add_action( 'init', 'block_restrict_content_register_block' );

function block_restrict_content_render($attributes, $content) {

	$user = wp_get_current_user();
	$rolesAllowed = array_map('strtolower', $attributes['rolesSelected']);

	if( !empty($user) && in_array( $user->roles[0], $rolesAllowed)) {
		return $content;
	} else {
		return '<div style="background-color: #ddd; text-align: center; padding: 20px;">You need permissions</div>' ;
	}
}