Feature: #68429 - Introduced AvatarProvider API

Description

To make providing an avatar image for BE users more flexible an API has been introduced so you can register AvatarProviders. The core provides the DefaultAvatarProvider by default to handle the image defined in the user settings.

When an avatar is rendered in the BE the available AvatarProviders are asked if they can provide an TYPO3\CMS\Backend\Backend\Avatar\Image for the given be_users record in the requested size. The first TYPO3\CMS\Backend\Backend\Avatar\Image that gets returned is used.

Registering an avatar provider

An avatar provider can be registered within your ext_localconf.php file like this:

$GLOBALS['TYPO3_CONF_VARS']['EXTCONF']['backend']['avatarProviders']['myCustomProvider'] = [
	'provider' => \MyVendor\MyExtension\AvatarProvider\CompanyAvatarProvider::class,
	'before' => ['defaultAvatarProvider']
];

The settings are defined as:

provider: The avatar provider class name, which must implement TYPO3\CMS\Backend\Backend\Avatar\AvatarProviderInterface.
before/after: You can define the ordering how providers are executed. This is used to get the order in which the providers are executed.

For a new avatar provider you have to register a new key in $GLOBALS['TYPO3_CONF_VARS']['EXTCONF']['backend']['avatarProviders']. If your avatar provider extends another one, you may only overwrite necessary settings. An example would be to extend an existing provider and replace its registered 'provider' class with your new class name.

$GLOBALS['TYPO3_CONF_VARS']['EXTCONF']['backend']['avatarProviders']['defaultAvatarProvider']['provider'] = \MyVendor\MyExtension\AvatarProvider\CustomAvatarProvider::class;

AvatarProviderInterface

The AvatarProviderInterface contains only one method:

public function getImage(array $backendUser, $size);

The parameters are defined as:

$backendUser: The record from be_users database table.
$size: The requested size of the avatar image.

The return value of the method is expected to be an instance of TYPO3\CMS\Backend\Backend\Avatar\Image or NULL when the provider can not provide an image.

An TYPO3\CMS\Backend\Backend\Image object has 3 properties:

$url: Url of avatar image. Needs to be relative to the website root or an absolute URL.
$width: The width of the image.
$height: The height of the image.