woocommerce-paypal-payments/modules/ppcp-api-client/src/Repository/CustomerRepository.php

<?php

/**
 * The customer repository.
 *
 * @package WooCommerce\PayPalCommerce\ApiClient\Repository
 */
declare (strict_types=1);
namespace WooCommerce\PayPalCommerce\ApiClient\Repository;

/**
 * Class CustomerRepository
 */
class CustomerRepository
{
    const CLIENT_ID_MAX_LENGTH = 22;
    /**
     * The prefix.
     *
     * @var string
     */
    protected $prefix;
    /**
     * CustomerRepository constructor.
     *
     * @param string $prefix The prefix.
     */
    public function __construct(string $prefix)
    {
        $this->prefix = $prefix;
    }
    /**
     * Returns the customer ID for the given user ID.
     *
     * @param int $user_id The user ID.
     * @return string
     */
    public function customer_id_for_user(int $user_id): string
    {
        if (0 === $user_id) {
            $guest_customer_id = WC()->session->get('ppcp_guest_customer_id');
            if (is_string($guest_customer_id) && $guest_customer_id) {
                return $guest_customer_id;
            }
            $unique_id = substr($this->prefix . strrev(uniqid()), 0, self::CLIENT_ID_MAX_LENGTH);
            assert(is_string($unique_id));
            WC()->session->set('ppcp_guest_customer_id', $unique_id);
            return $unique_id;
        }
        $guest_customer_id = get_user_meta($user_id, 'ppcp_guest_customer_id', \true);
        if ($guest_customer_id) {
            return $guest_customer_id;
        }
        return get_user_meta($user_id, 'ppcp_customer_id', \true) ?: $this->prefix . (string) $user_id;
    }
}