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<?php
declare(strict_types=1);
/**
* SPDX-FileCopyrightText: 2022 Nextcloud GmbH and Nextcloud contributors
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
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;
use OCP\User\Events\UserDeletedEvent;
/**
* 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* outdated.
* @template-implements IEventListener<UserChangedEvent|UserDeletedEvent>
*/
class DisplayNameCache implements IEventListener {
private array $cache = [];
private ICache $memCache;
private IUserManager $userManager;
public function __construct(ICacheFactory $cacheFactory, IUserManager $userManager) {
$this->memCache = $cacheFactory->createDistributed('displayNameMappingCache');
$this->userManager = $userManager;
}
public function getDisplayName(string $userId): ?string {
if (isset($this->cache[$userId])) {
return $this->cache[$userId];
}
$displayName = $this->memCache->get($userId);
if ($displayName) {
$this->cache[$userId] = $displayName;
return $displayName;
}
$user = $this->userManager->get($userId);
if ($user) {
$displayName = $user->getDisplayName();
} else {
$displayName = null;
}
$this->cache[$userId] = $displayName;
$this->memCache->set($userId, $displayName, 60 * 10); // 10 minutes
return $displayName;
}
public function clear(): void {
$this->cache = [];
$this->memCache->clear();
}
public function handle(Event $event): void {
if ($event instanceof UserChangedEvent && $event->getFeature() === 'displayName') {
$userId = $event->getUser()->getUID();
$newDisplayName = $event->getValue();
$this->cache[$userId] = $newDisplayName;
$this->memCache->set($userId, $newDisplayName, 60 * 10); // 10 minutes
}
if ($event instanceof UserDeletedEvent) {
$userId = $event->getUser()->getUID();
unset($this->cache[$userId]);
$this->memCache->remove($userId);
}
}
}
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