nextcloud/apps/federation/lib/BackgroundJob/GetSharedSecret.php

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<?php
/**
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* @copyright Copyright (c) 2016, ownCloud, Inc.
*
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* @author Björn Schießle <bjoern@schiessle.org>
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* @author Joas Schilling <coding@schilljs.com>
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* @author Robin Appelman <robin@icewind.nl>
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* @author Thomas Müller <thomas.mueller@tmit.eu>
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*
* @license AGPL-3.0
*
* This code is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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, version 3,
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
namespace OCA\Federation\BackgroundJob;
use GuzzleHttp\Exception\ClientException;
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use OC\BackgroundJob\JobList;
use OC\BackgroundJob\Job;
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use OCA\Federation\DbHandler;
use OCA\Federation\TrustedServers;
use OCP\AppFramework\Http;
use OCP\AppFramework\Utility\ITimeFactory;
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use OCP\BackgroundJob\IJobList;
use OCP\Http\Client\IClient;
use OCP\Http\Client\IClientService;
use OCP\Http\Client\IResponse;
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use OCP\ILogger;
use OCP\IURLGenerator;
use OCP\OCS\IDiscoveryService;
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/**
* Class GetSharedSecret
*
* request shared secret from remote Nextcloud
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*
* @package OCA\Federation\Backgroundjob
*/
class GetSharedSecret extends Job {
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/** @var IClient */
private $httpClient;
/** @var IJobList */
private $jobList;
/** @var IURLGenerator */
private $urlGenerator;
/** @var TrustedServers */
private $trustedServers;
/** @var DbHandler */
private $dbHandler;
/** @var IDiscoveryService */
private $ocsDiscoveryService;
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/** @var ILogger */
private $logger;
/** @var ITimeFactory */
private $timeFactory;
/** @var bool */
protected $retainJob = false;
private $format = '?format=json';
private $defaultEndPoint = '/ocs/v2.php/apps/federation/api/v1/shared-secret';
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/** @var int 30 day = 2592000sec */
private $maxLifespan = 2592000;
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/**
* RequestSharedSecret constructor.
*
* @param IClientService $httpClientService
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* @param IURLGenerator $urlGenerator
* @param IJobList $jobList
* @param TrustedServers $trustedServers
* @param ILogger $logger
* @param DbHandler $dbHandler
* @param IDiscoveryService $ocsDiscoveryService
* @param ITimeFactory $timeFactory
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*/
public function __construct(
IClientService $httpClientService,
IURLGenerator $urlGenerator,
IJobList $jobList,
TrustedServers $trustedServers,
ILogger $logger,
DbHandler $dbHandler,
IDiscoveryService $ocsDiscoveryService,
ITimeFactory $timeFactory
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) {
$this->logger = $logger;
$this->httpClient = $httpClientService->newClient();
$this->jobList = $jobList;
$this->urlGenerator = $urlGenerator;
$this->dbHandler = $dbHandler;
$this->ocsDiscoveryService = $ocsDiscoveryService;
$this->trustedServers = $trustedServers;
$this->timeFactory = $timeFactory;
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}
/**
* run the job, then remove it from the joblist
*
* @param JobList $jobList
* @param ILogger|null $logger
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*/
public function execute($jobList, ILogger $logger = null) {
$target = $this->argument['url'];
// only execute if target is still in the list of trusted domains
if ($this->trustedServers->isTrustedServer($target)) {
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$this->parentExecute($jobList, $logger);
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}
$jobList->remove($this, $this->argument);
if ($this->retainJob) {
$this->reAddJob($this->argument);
}
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}
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/**
* call execute() method of parent
*
* @param JobList $jobList
* @param ILogger $logger
*/
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protected function parentExecute($jobList, $logger = null) {
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parent::execute($jobList, $logger);
}
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protected function run($argument) {
$target = $argument['url'];
$created = isset($argument['created']) ? (int)$argument['created'] : $this->timeFactory->getTime();
$currentTime = $this->timeFactory->getTime();
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$source = $this->urlGenerator->getAbsoluteURL('/');
$source = rtrim($source, '/');
$token = $argument['token'];
// kill job after 30 days of trying
$deadline = $currentTime - $this->maxLifespan;
if ($created < $deadline) {
$this->retainJob = false;
$this->trustedServers->setServerStatus($target,TrustedServers::STATUS_FAILURE);
return;
}
$endPoints = $this->ocsDiscoveryService->discover($target, 'FEDERATED_SHARING');
$endPoint = isset($endPoints['shared-secret']) ? $endPoints['shared-secret'] : $this->defaultEndPoint;
// make sure that we have a well formatted url
$url = rtrim($target, '/') . '/' . trim($endPoint, '/') . $this->format;
$result = null;
try {
$result = $this->httpClient->get(
$url,
[
'query' =>
[
'url' => $source,
'token' => $token
],
'timeout' => 3,
'connect_timeout' => 3,
]
);
$status = $result->getStatusCode();
} catch (ClientException $e) {
$status = $e->getCode();
if ($status === Http::STATUS_FORBIDDEN) {
$this->logger->info($target . ' refused to exchange a shared secret with you.', ['app' => 'federation']);
} else {
$this->logger->info($target . ' responded with a ' . $status . ' containing: ' . $e->getMessage(), ['app' => 'federation']);
}
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} catch (\Exception $e) {
$status = Http::STATUS_INTERNAL_SERVER_ERROR;
$this->logger->logException($e, ['app' => 'federation']);
}
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// if we received a unexpected response we try again later
if (
$status !== Http::STATUS_OK
&& $status !== Http::STATUS_FORBIDDEN
) {
$this->retainJob = true;
} else {
// reset token if we received a valid response
$this->dbHandler->addToken($target, '');
}
if ($status === Http::STATUS_OK && $result instanceof IResponse) {
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$body = $result->getBody();
$result = json_decode($body, true);
if (isset($result['ocs']['data']['sharedSecret'])) {
$this->trustedServers->addSharedSecret(
$target,
$result['ocs']['data']['sharedSecret']
);
} else {
$this->logger->error(
'remote server "' . $target . '"" does not return a valid shared secret',
['app' => 'federation']
);
$this->trustedServers->setServerStatus($target, TrustedServers::STATUS_FAILURE);
}
}
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}
/**
* re-add background job
*
* @param array $argument
*/
protected function reAddJob(array $argument) {
$url = $argument['url'];
$created = isset($argument['created']) ? (int)$argument['created'] : $this->timeFactory->getTime();
$token = $argument['token'];
$this->jobList->add(
GetSharedSecret::class,
[
'url' => $url,
'token' => $token,
'created' => $created
]
);
}
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}