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<?php
declare(strict_types=1);
/**
* SPDX-FileCopyrightText: 2023 Nextcloud GmbH and Nextcloud contributors
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
namespace OC\OCM;
use JsonException;
use OCP\AppFramework\Http;
use OCP\Http\Client\IClientService;
use OCP\ICache;
use OCP\ICacheFactory;
use OCP\IConfig;
use OCP\OCM\Exceptions\OCMProviderException;
use OCP\OCM\IOCMDiscoveryService;
use OCP\OCM\IOCMProvider;
use Psr\Log\LoggerInterface;
/**
* @since 28.0.0
*/
class OCMDiscoveryService implements IOCMDiscoveryService {
private ICache $cache;
public function __construct(
ICacheFactory $cacheFactory,
private IClientService $clientService,
private IConfig $config,
private IOCMProvider $provider,
private LoggerInterface $logger,
) {
$this->cache = $cacheFactory->createDistributed('ocm-discovery');
}
/**
* @param string $remote
* @param bool $skipCache
*
* @return IOCMProvider
* @throws OCMProviderException
*/
public function discover(string $remote, bool $skipCache = false): IOCMProvider {
$remote = rtrim($remote, '/');
if (!str_starts_with($remote, 'http://') && !str_starts_with($remote, 'https://')) {
// if scheme not specified, we test both;
try {
return $this->discover('https://' . $remote, $skipCache);
} catch (OCMProviderException) {
return $this->discover('http://' . $remote, $skipCache);
}
}
if (!$skipCache) {
try {
$cached = $this->cache->get($remote);
if ($cached === false) {
throw new OCMProviderException('Previous discovery failed.');
}
$this->provider->import(json_decode($cached ?? '', true, 8, JSON_THROW_ON_ERROR) ?? []);
return $this->provider;
} catch (JsonException|OCMProviderException $e) {
// we ignore cache on issues
}
}
$client = $this->clientService->newClient();
try {
$options = [
'timeout' => 10,
'connect_timeout' => 10,
];
if ($this->config->getSystemValueBool('sharing.federation.allowSelfSignedCertificates') === true) {
$options['verify'] = false;
}
$response = $client->get($remote . '/ocm-provider/', $options);
if ($response->getStatusCode() === Http::STATUS_OK) {
$body = $response->getBody();
// update provider with data returned by the request
$this->provider->import(json_decode($body, true, 8, JSON_THROW_ON_ERROR) ?? []);
$this->cache->set($remote, $body, 60 * 60 * 24);
}
} catch (JsonException|OCMProviderException $e) {
$this->cache->set($remote, false, 5 * 60);
throw new OCMProviderException('data returned by remote seems invalid - ' . ($body ?? ''));
} catch (\Exception $e) {
$this->cache->set($remote, false, 5 * 60);
$this->logger->warning('error while discovering ocm provider', [
'exception' => $e,
'remote' => $remote
]);
throw new OCMProviderException('error while requesting remote ocm provider');
}
return $this->provider;
}
}
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