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I'm trying to change cookie_lifetime dynamically in my D8 project, to set cookie_lifetime to 0 or to some value(for example 24 hours). I know that this can be partially acomplished by changing cookie_lifetime variable in sites/default/services.yml, but this is not my case.

I've tried to use this answer but looks like it works only when I use start() method of the session manager.

So how do I change dynamically cookie_lifetime for existing session? Any answers appreciated, thanks in advance!

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You can override SessionConfiguration::getOptions to set the cookie lifetime dynamically:

/mymodule/src/MySessionConfiguration.php:

<?php

namespace Drupal\mymodule;

use Drupal\Core\Session\SessionConfiguration;
use Symfony\Component\HttpFoundation\Request;

/**
 * Sets session cookie lifetime dynamically.
 */
class MySessionConfiguration extends SessionConfiguration {

  /**
   * {@inheritdoc}
   */
  public function getOptions(Request $request) {
    $options = parent::getOptions($request);

    // Set the cookie lifetime dynamically depending on the request.
    $options['cookie_lifetime'] = 30;

    return $options;
  }

}

Swap the service class in the container:

/mymodule/src/MymoduleServiceProvider.php:

<?php

namespace Drupal\mymodule;

use Drupal\Core\DependencyInjection\ContainerBuilder;
use Drupal\Core\DependencyInjection\ServiceProviderBase;

/**
 * Modifies the service.
 */
class MymoduleServiceProvider extends ServiceProviderBase {

  /**
   * {@inheritdoc}
   */
  public function alter(ContainerBuilder $container) {
    $definition = $container->getDefinition('session_configuration');
    $definition->setClass('Drupal\mymodule\MySessionConfiguration');
  }

}

See Altering existing services, providing dynamic services.

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