ProductTokenizer.php

<?php
 
namespace Bitrix\Catalog\v2\Integration\Landing;
 
use Bitrix\Main\Request;
use Bitrix\Main\Web\Uri;
 
final class ProductTokenizer
{
    private const PRODUCT_TOKEN = 'productToken';
 
    public static function encode(array $productIds): string
    {
        $productIds = array_unique(array_filter(array_map('intval', $productIds)));
        if (empty($productIds))
        {
            return '';
        }
 
        return self::encodeBase64Url(implode(',', $productIds));
    }
 
    public static function mixIntoUri(Uri $uri, array $productIds): Uri
    {
        $token = self::encode($productIds);
        if ($token === '')
        {
            return $uri;
        }
 
        return $uri->addParams([
            self::PRODUCT_TOKEN => self::encode($productIds),
        ]);
    }
 
    public static function decode(string $token): array
    {
        if ($token === '')
        {
            return [];
        }
 
        $productIds = explode(',', self::decodeBase64Url($token));
        if (!is_array($productIds) || empty($productIds))
        {
            return [];
        }
 
        return array_unique(array_filter(array_map('intval', $productIds)));
    }
 
    public static function decodeFromRequest(Request $request): ?array
    {
        $token = $request->get(self::PRODUCT_TOKEN);
        if ($token !== null && is_string($token))
        {
            return self::decode($token);
        }
 
        return null;
    }
 
    public static function encodeBase64Url(string $data): string
    {
        return rtrim(strtr(base64_encode($data), '+/', '-_'), '=');
    }
 
    public static function decodeBase64Url(string $data): string
    {
        return base64_decode(str_pad(strtr($data, '-_', '+/'), strlen($data) % 4, '=', STR_PAD_RIGHT));
    }
}