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