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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;
private array $supportedAPIVersion =
[
'1.0-proposal1',
'1.0',
'1.1'
];
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 (!$skipCache) {
try {
$this->provider->import(json_decode($this->cache->get($remote) ?? '', true, 8, JSON_THROW_ON_ERROR) ?? []);
if ($this->supportedAPIVersion($this->provider->getApiVersion())) {
return $this->provider; // if cache looks valid, we use it
}
} 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 $e) {
throw new OCMProviderException('data returned by remote seems invalid - ' . ($body ?? ''));
} catch (\Exception $e) {
$this->logger->warning('error while discovering ocm provider', [
'exception' => $e,
'remote' => $remote
]);
throw new OCMProviderException('error while requesting remote ocm provider');
}
if (!$this->supportedAPIVersion($this->provider->getApiVersion())) {
throw new OCMProviderException('API version not supported');
}
return $this->provider;
}
/**
* Check the version from remote is supported.
* The minor version of the API will be ignored:
* 1.0.1 is identified as 1.0
*
* @param string $version
*
* @return bool
*/
private function supportedAPIVersion(string $version): bool {
$dot1 = strpos($version, '.');
$dot2 = strpos($version, '.', $dot1 + 1);
if ($dot2 > 0) {
$version = substr($version, 0, $dot2);
}
return (in_array($version, $this->supportedAPIVersion));
}
}
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