Deprecation: #107802 - Deprecate usage of array in password for authentication in Redis session backend 

See forge#107802

Description 

Since Redis 6.0 it is possible to authenticate against Redis using both a username and a password. Prior to this version, authentication was only possible via password. With this patch, you can configure the TYPO3 Redis session backend as follows:

config/system/additional.php 
use TYPO3\CMS\Core\Session\Backend\RedisSessionBackend;

$GLOBALS['TYPO3_CONF_VARS']['SYS']['session']['BE'] = [
    'backend' => RedisSessionBackend::class,
    'options' => [
        'database' => 0,
        'hostname' => 'redis',
        'port' => 6379,
        'username' => 'redis',
        'password' => 'redis',
    ]
];
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Impact 

The "password" configuration option of the Redis session backend is now typed as array|string. Setting this configuration option with an array is deprecated and will be removed in 15.0.

Affected installations 

All installations using a Redis session backend and using the password configuration option to pass an array with a username and password to it.

Migration 

Use the configuration options username and password.

Before:

config/system/additional.php 
use TYPO3\CMS\Core\Session\Backend\RedisSessionBackend;

$GLOBALS['TYPO3_CONF_VARS']['SYS']['session']['BE'] = [
    'backend' => RedisSessionBackend::class,
    'options' => [
        'database' => 0,
        'hostname' => 'redis',
        'port' => 6379,
        'username' => 'redis',
        'password' =>[
            'user' => 'redis',
            'pass' => 'redis'
        ]
    ]
];
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After:

config/system/additional.php 
use TYPO3\CMS\Core\Session\Backend\RedisSessionBackend;

$GLOBALS['TYPO3_CONF_VARS']['SYS']['session']['BE'] = [
    'backend' => RedisSessionBackend::class,
    'options' => [
        'database' => 0,
        'hostname' => 'redis',
        'port' => 6379,
        'username' => 'redis',
        'password' => 'redis',
    ]
];
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