Feature: #101059 - Allow install tool sessions without shared file system

Description

It is now possible to store Install Tool sessions in Redis or configure the session storage path for file-based Install Tool sessions.

As a shipped session handler, Redis can now be configured via options in $GLOBALS['TYPO3_CONF_VARS'] for host, port, database, and authentication.

Example

To configure an alternative session handler for Install Tool sessions, set the required options in your settings.php or additional.php file:

File-based session handler in config/system/settings.php

use TYPO3\CMS\Core\Core\Environment;
use TYPO3\CMS\Install\Service\Session\FileSessionHandler;

return [
    'BE' => [
        'installToolSessionHandler' => [
            'className' => FileSessionHandler::class,
            'options' => [
                'sessionPath' => Environment::getVarPath() . '/session',
            ],
        ],
    ],
];

Redis session handler in config/system/settings.php

use TYPO3\CMS\Install\Service\Session\RedisSessionHandler;

return [
    'BE' => [
        'installToolSessionHandler' => [
            'className' => RedisSessionHandler::class,
            'options' => [
                'host' => '127.0.0.1',
                'port' => 6379,
                'database' => 0,
                'authentication' => [
                    'user' => 'redis',
                    'pass' => 'redis',
                ],
            ],
        ],
    ],
];

Impact

The default file-based session handling for the Install Tool remains unchanged. If no alternative session handler for the Install Tool is configured, the default behavior is used.

Custom session handlers can be created by implementing PHP's \SessionHandlerInterface.