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 patch, you can now configure the TYPO3 Redis cache backend as follows:

config/system/additional.php 
$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['pages']['backend']
    = \TYPO3\CMS\Core\Cache\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 a array|string. Setting this configuration option with an array is deprecated and will be removed in 15.0.

Affected installations 

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

Migration 

Use the configuration options username and password.

Before:

config/system/additional.php 
$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['pages']['backend']
    = \TYPO3\CMS\Core\Cache\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:

config/system/additional.php 
$GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['pages']['backend']
    = \TYPO3\CMS\Core\Cache\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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