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<?php
declare(strict_types=1);
/**
* @copyright Copyright (c) 2022 Julius Härtl <jus@bitgrid.net>
*
* @author Julius Härtl <jus@bitgrid.net>
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* 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
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
namespace OC\Collaboration\Reference;
use OCP\Collaboration\Reference\IReference;
use OCP\Collaboration\Reference\IReferenceManager;
use OCP\Collaboration\Reference\IReferenceProvider;
use OCP\ICache;
use OCP\ICacheFactory;
class ReferenceManager implements IReferenceManager {
public const URL_PATTERN = '/(\s|\n|^)(https?:\/\/)?((?:[-A-Z0-9+_]+\.)+[-A-Z]+(?:\/[-A-Z0-9+&@#%?=~_|!:,.;()]*)*)(\s|\n|$)/mi';
public const CACHE_TTL = 60;
/** @var IReferenceProvider[] */
private array $providers = [];
private ICache $cache;
private LinkReferenceProvider $linkReferenceProvider;
public function __construct(LinkReferenceProvider $linkReferenceProvider, FileReferenceProvider $fileReferenceProvider, ICacheFactory $cacheFactory) {
$this->registerReferenceProvider($fileReferenceProvider);
$this->linkReferenceProvider = $linkReferenceProvider;
$this->cache = $cacheFactory->createDistributed('reference');
}
public function extractReferences(string $text): array {
preg_match_all(self::URL_PATTERN, $text, $matches);
$references = $matches[0] ?? [];
return array_map(function ($reference) {
return trim($reference);
}, $references);
}
public function resolveReference(string $referenceId): ?IReference {
$matchedProvider = $this->getMatchedProvider($referenceId);
if ($matchedProvider === null) {
return null;
}
$cacheKey = $this->getCacheKey($matchedProvider, $referenceId);
$cached = $this->cache->get($cacheKey);
if ($cached) {
return Reference::fromCache($cached);
}
$reference = $matchedProvider->resolveReference($referenceId);
if ($reference) {
$this->cache->set($cacheKey, Reference::toCache($reference), self::CACHE_TTL);
return $reference;
}
return null;
}
private function getMatchedProvider(string $referenceId): ?IReferenceProvider {
$matchedProvider = null;
foreach ($this->providers as $provider) {
$matchedProvider = $provider->matchReference($referenceId) ? $provider : null;
}
if ($matchedProvider === null && $this->linkReferenceProvider->matchReference($referenceId)) {
$matchedProvider = $this->linkReferenceProvider;
}
return $matchedProvider;
}
private function getCacheKey(IReferenceProvider $provider, string $referenceId): string {
return md5($referenceId) . (
$provider->isGloballyCachable()
? ''
: '-' . md5($provider->getCacheKey($referenceId))
);
}
public function invalidateCache(string $referenceId, ?string $providerCacheKey = null): void {
$matchedProvider = $this->getMatchedProvider($referenceId);
if ($matchedProvider === null) {
return;
}
if ($providerCacheKey === null) {
$this->cache->clear(md5($referenceId));
return;
}
$this->cache->remove($this->getCacheKey($matchedProvider, $referenceId));
}
public function registerReferenceProvider(IReferenceProvider $provider): void {
$this->providers[] = $provider;
}
}
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