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<?php
declare(strict_types=1);
/**
* @copyright Copyright 2022 Carl Schwan <carl@carlschwan.eu>
* @license AGPL-3.0-or-later
*
* This code is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License, version 3,
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
namespace OC\User;
use OCP\EventDispatcher\Event;
use OCP\EventDispatcher\IEventListener;
use OCP\ICache;
use OCP\ICacheFactory;
use OCP\IUserManager;
use OCP\User\Events\UserChangedEvent;
/**
* Class that cache the relation UserId -> Display name
*
* This saves fetching the user from a user backend and later on fetching
* their preferences. It's generally not an issue if this data is slightly
* outdated.
*/
class DisplayNameCache implements IEventListener {
private ICache $internalCache;
private IUserManager $userManager;
public function __construct(ICacheFactory $cacheFactory, IUserManager $userManager) {
$this->internalCache = $cacheFactory->createDistributed('displayNameMappingCache');
$this->userManager = $userManager;
}
public function getDisplayName(string $userId) {
$displayName = $this->internalCache->get($userId);
if ($displayName) {
return $displayName;
}
$user = $this->userManager->get($userId);
if ($user) {
$displayName = $user->getDisplayName();
} else {
$displayName = $userId;
}
$this->internalCache->set($userId, $displayName, 60 * 10); // 10 minutes
return $displayName;
}
public function clear(): void {
$this->internalCache->clear();
}
public function handle(Event $event): void {
if ($event instanceof UserChangedEvent && $event->getFeature() === 'displayName') {
$userId = $event->getUser()->getUID();
$newDisplayName = $event->getValue();
$this->internalCache->set($userId, $newDisplayName, 60 * 10); // 10 minutes
}
}
}
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