DefaultAvatarProvider.php

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<?php
namespace TYPO3\CMS\Backend\Backend\Avatar;

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

use TYPO3\CMS\Core\Database\ConnectionPool;
use TYPO3\CMS\Core\Resource\Exception\FileDoesNotExistException;
use TYPO3\CMS\Core\Resource\ProcessedFile;
use TYPO3\CMS\Core\Resource\ResourceFactory;
use TYPO3\CMS\Core\Utility\GeneralUtility;

class DefaultAvatarProvider implements AvatarProviderInterface
{
    public function getImage(array $backendUser, $size)
    {
        $fileUid = $this->getAvatarFileUid($backendUser['uid']);

        // Get file object
        try {
            $file = ResourceFactory::getInstance()->getFileObject($fileUid);
            $processedImage = $file->process(
                ProcessedFile::CONTEXT_IMAGECROPSCALEMASK,
                ['width' => $size . 'c', 'height' => $size . 'c']
            );

            $image = GeneralUtility::makeInstance(
                Image::class,
                $processedImage->getPublicUrl(),
                $processedImage->getProperty('width'),
                $processedImage->getProperty('height')
            );
        } catch (FileDoesNotExistException $e) {
            // No image found
            $image = null;
        }

        return $image;
    }

    protected function getAvatarFileUid($backendUserId)
    {
        $queryBuilder = GeneralUtility::makeInstance(ConnectionPool::class)->getQueryBuilderForTable('sys_file_reference');
        $fileUid = $queryBuilder
            ->select('uid_local')
            ->from('sys_file_reference')
            ->where(
                $queryBuilder->expr()->eq(
                    'tablenames',
                    $queryBuilder->createNamedParameter('be_users', \PDO::PARAM_STR)
                ),
                $queryBuilder->expr()->eq(
                    'fieldname',
                    $queryBuilder->createNamedParameter('avatar', \PDO::PARAM_STR)
                ),
                $queryBuilder->expr()->eq(
                    'table_local',
                    $queryBuilder->createNamedParameter('sys_file', \PDO::PARAM_STR)
                ),
                $queryBuilder->expr()->eq(
                    'uid_foreign',
                    $queryBuilder->createNamedParameter((int)$backendUserId, \PDO::PARAM_INT)
                )
            )
            ->execute()
            ->fetchColumn();

        return (int)$fileUid;
    }
}