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<?php
declare(strict_types=1);
/**
* @copyright Copyright (c) 2018 Robin Appelman <robin@icewind.nl>
*
* @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\Files\ObjectStore;
use GuzzleHttp\Client;
use GuzzleHttp\Exception\ClientException;
use GuzzleHttp\Exception\ConnectException;
use GuzzleHttp\Exception\RequestException;
use GuzzleHttp\HandlerStack;
use OCP\Files\StorageAuthException;
use OCP\Files\StorageNotAvailableException;
use OCP\ICache;
use OCP\ILogger;
use OpenStack\Common\Error\BadResponseError;
use OpenStack\Common\Auth\Token;
use OpenStack\Identity\v2\Service as IdentityV2Service;
use OpenStack\Identity\v3\Service as IdentityV3Service;
use OpenStack\OpenStack;
use OpenStack\Common\Transport\Utils as TransportUtils;
use Psr\Http\Message\RequestInterface;
use OpenStack\ObjectStore\v1\Models\Container;
class SwiftFactory {
private $cache;
private $params;
/** @var Container|null */
private $container = null;
private $logger;
public function __construct(ICache $cache, array $params, ILogger $logger) {
$this->cache = $cache;
$this->params = $params;
$this->logger = $logger;
}
private function getCachedToken(string $cacheKey) {
$cachedTokenString = $this->cache->get($cacheKey . '/token');
if ($cachedTokenString) {
return json_decode($cachedTokenString);
} else {
return null;
}
}
private function cacheToken(Token $token, string $cacheKey) {
if ($token instanceof \OpenStack\Identity\v3\Models\Token) {
$value = json_encode($token->export());
} else {
$value = json_encode($token);
}
$this->cache->set($cacheKey . '/token', $value);
}
/**
* @return OpenStack
* @throws StorageAuthException
*/
private function getClient() {
if (isset($this->params['bucket'])) {
$this->params['container'] = $this->params['bucket'];
}
if (!isset($this->params['container'])) {
$this->params['container'] = 'nextcloud';
}
if (!isset($this->params['autocreate'])) {
// should only be true for tests
$this->params['autocreate'] = false;
}
if (isset($this->params['user']) && is_array($this->params['user'])) {
$userName = $this->params['user']['name'];
} else {
if (!isset($this->params['username']) && isset($this->params['user'])) {
$this->params['username'] = $this->params['user'];
}
$userName = $this->params['username'];
}
if (!isset($this->params['tenantName']) && isset($this->params['tenant'])) {
$this->params['tenantName'] = $this->params['tenant'];
}
$cacheKey = $userName . '@' . $this->params['url'] . '/' . $this->params['container'];
$token = $this->getCachedToken($cacheKey);
$this->params['cachedToken'] = $token;
$httpClient = new Client([
'base_uri' => TransportUtils::normalizeUrl($this->params['url']),
'handler' => HandlerStack::create()
]);
if (isset($this->params['user']) && isset($this->params['user']['name'])) {
return $this->auth(IdentityV3Service::factory($httpClient), $cacheKey);
} else {
return $this->auth(IdentityV2Service::factory($httpClient), $cacheKey);
}
}
/**
* @param IdentityV2Service|IdentityV3Service $authService
* @param string $cacheKey
* @return OpenStack
* @throws StorageAuthException
*/
private function auth($authService, string $cacheKey) {
$this->params['identityService'] = $authService;
$this->params['authUrl'] = $this->params['url'];
$client = new OpenStack($this->params);
$cachedToken = $this->params['cachedToken'];
$hasValidCachedToken = false;
if (is_array($cachedToken)) {
$token = $authService->generateTokenFromCache($cachedToken);
if (is_null($token->catalog)) {
$this->logger->warning('Invalid cached token for swift, no catalog set: ' . json_encode($cachedToken));
} else if ($token->hasExpired()) {
$this->logger->debug('Cached token for swift expired');
} else {
$hasValidCachedToken = true;
}
}
if (!$hasValidCachedToken) {
try {
$token = $authService->generateToken($this->params);
$this->cacheToken($token, $cacheKey);
} catch (ConnectException $e) {
throw new StorageAuthException('Failed to connect to keystone, verify the keystone url', $e);
} catch (ClientException $e) {
$statusCode = $e->getResponse()->getStatusCode();
if ($statusCode === 404) {
throw new StorageAuthException('Keystone not found, verify the keystone url', $e);
} else if ($statusCode === 412) {
throw new StorageAuthException('Precondition failed, verify the keystone url', $e);
} else if ($statusCode === 401) {
throw new StorageAuthException('Authentication failed, verify the username, password and possibly tenant', $e);
} else {
throw new StorageAuthException('Unknown error', $e);
}
} catch (RequestException $e) {
throw new StorageAuthException('Connection reset while connecting to keystone, verify the keystone url', $e);
}
}
return $client;
}
/**
* @return \OpenStack\ObjectStore\v1\Models\Container
* @throws StorageAuthException
* @throws StorageNotAvailableException
*/
public function getContainer() {
if (is_null($this->container)) {
$this->container = $this->createContainer();
}
return $this->container;
}
/**
* @return \OpenStack\ObjectStore\v1\Models\Container
* @throws StorageAuthException
* @throws StorageNotAvailableException
*/
private function createContainer() {
$client = $this->getClient();
$objectStoreService = $client->objectStoreV1();
$autoCreate = isset($this->params['autocreate']) && $this->params['autocreate'] === true;
try {
$container = $objectStoreService->getContainer($this->params['container']);
if ($autoCreate) {
$container->getMetadata();
}
return $container;
} catch (BadResponseError $ex) {
// if the container does not exist and autocreate is true try to create the container on the fly
if ($ex->getResponse()->getStatusCode() === 404 && $autoCreate) {
return $objectStoreService->createContainer([
'name' => $this->params['container']
]);
} else {
throw new StorageNotAvailableException('Invalid response while trying to get container info', StorageNotAvailableException::STATUS_ERROR, $ex);
}
} catch (ConnectException $e) {
/** @var RequestInterface $request */
$request = $e->getRequest();
$host = $request->getUri()->getHost() . ':' . $request->getUri()->getPort();
\OC::$server->getLogger()->error("Can't connect to object storage server at $host");
throw new StorageNotAvailableException("Can't connect to object storage server at $host", StorageNotAvailableException::STATUS_ERROR, $e);
}
}
}
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