Deprecation: #107725 - Deprecate usage of array in password for authentication in Redis cache backend 

See forge#107725

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 with a password.

With this change, TYPO3's Redis cache backend supports username and password authentication directly. You can now configure the TYPO3 Redis cache backend as follows:

config/system/additional.php 
use TYPO3\CMS\Core\Cache\Backend\RedisBackend;

$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['pages']['backend']
    = RedisBackend::class;

$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['pages']['options']
    = [
        'defaultLifetime' => 86400,
        'database' => 0,
        'hostname' => 'redis',
        'port' => 6379,
        'username' => 'redis',
        'password' => 'redis',
    ];
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Impact 

The password configuration option of the Redis cache backend is now typed as array|string.

Setting this configuration option with an array is deprecated and will be removed in TYPO3 v15.0.

Affected installations 

All installations using the Redis cache backend and configuring the password option as an array containing both username and password values are affected.

Migration 

Use the dedicated configuration options username and password instead of passing an array to password.

Before (deprecated):

config/system/additional.php 
use TYPO3\CMS\Core\Cache\Backend\RedisBackend;

$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['pages']['backend']
    = RedisBackend::class;

$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['pages']['options']
    = [
        'defaultLifetime' => 86400,
        'database' => 0,
        'hostname' => 'redis',
        'port' => 6379,
        'password' => [
            'user' => 'redis',
            'pass' => 'redis',
        ],
    ];
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After (recommended):

config/system/additional.php 
use TYPO3\CMS\Core\Cache\Backend\RedisBackend;

$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['pages']['backend']
    = RedisBackend::class;

$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['pages']['options']
    = [
        'defaultLifetime' => 86400,
        'database' => 0,
        'hostname' => 'redis',
        'port' => 6379,
        'username' => 'redis',
        'password' => 'redis',
    ];
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