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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 Fusonic\OpenGraph\Consumer;
use OC\SystemConfig;
use OCP\Collaboration\Reference\IReference;
use OCP\Collaboration\Reference\IReferenceProvider;
use OCP\Http\Client\IClientService;
use Psr\Log\LoggerInterface;
class LinkReferenceProvider implements IReferenceProvider {
public const URL_PATTERN = '/(\s|^)(https?:\/\/)?((?:[-A-Z0-9+_]+\.)+[-A-Z]+(?:\/[-A-Z0-9+&@#%?=~_|!:,.;()]*)*)(\s|$)/i';
private IClientService $clientService;
private LoggerInterface $logger;
private SystemConfig $systemConfig;
public function __construct(IClientService $clientService, LoggerInterface $logger, SystemConfig $systemConfig) {
$this->clientService = $clientService;
$this->logger = $logger;
$this->systemConfig = $systemConfig;
}
public function resolveReference(string $referenceText): ?IReference {
if ($this->systemConfig->getValue('reference_opengraph', true) !== true) {
return null;
}
if (preg_match(self::URL_PATTERN, $referenceText)) {
$reference = new Reference($referenceText);
$this->fetchReference($reference);
return $reference;
}
return null;
}
private function fetchReference(Reference $reference) {
$client = $this->clientService->newClient();
try {
$response = $client->get($reference->getId());
} catch (\Exception $e) {
$this->logger->debug('Failed to fetch link for obtaining open graph data', ['exception' => $e]);
return;
}
$responseBody = (string)$response->getBody();
$reference->setUrl($reference->getId());
// OpenGraph handling
$consumer = new Consumer();
$object = $consumer->loadHtml($responseBody);
if ($object->title) {
$reference->setTitle($object->title);
}
if ($object->description) {
$reference->setDescription($object->description);
}
if ($object->images) {
$reference->setImageUrl($object->images[0]->url);
}
}
}
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