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<?php
/**
* @copyright Copyright (c) 2018 Bjoern Schiessle <bjoern@schiessle.org>
*
* @author Bjoern Schiessle <bjoern@schiessle.org>
* @author Christoph Wurst <christoph@winzerhof-wurst.at>
*
* @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\Federation;
use OC\AppFramework\Http;
use OCP\App\IAppManager;
use OCP\Federation\Exceptions\ProviderDoesNotExistsException;
use OCP\Federation\ICloudFederationNotification;
use OCP\Federation\ICloudFederationProvider;
use OCP\Federation\ICloudFederationProviderManager;
use OCP\Federation\ICloudFederationShare;
use OCP\Federation\ICloudIdManager;
use OCP\Http\Client\IClientService;
use Psr\Log\LoggerInterface;
/**
* Class Manager
*
* Manage Cloud Federation Providers
*
* @package OC\Federation
*/
class CloudFederationProviderManager implements ICloudFederationProviderManager {
/** @var array list of available cloud federation providers */
private $cloudFederationProvider;
/** @var IAppManager */
private $appManager;
/** @var IClientService */
private $httpClientService;
/** @var ICloudIdManager */
private $cloudIdManager;
private LoggerInterface $logger;
/** @var array cache OCM end-points */
private $ocmEndPoints = [];
private $supportedAPIVersion = '1.0-proposal1';
/**
* CloudFederationProviderManager constructor.
*
* @param IAppManager $appManager
* @param IClientService $httpClientService
* @param ICloudIdManager $cloudIdManager
*/
public function __construct(IAppManager $appManager,
IClientService $httpClientService,
ICloudIdManager $cloudIdManager,
LoggerInterface $logger) {
$this->cloudFederationProvider = [];
$this->appManager = $appManager;
$this->httpClientService = $httpClientService;
$this->cloudIdManager = $cloudIdManager;
$this->logger = $logger;
}
/**
* Registers an callback function which must return an cloud federation provider
*
* @param string $resourceType which resource type does the provider handles
* @param string $displayName user facing name of the federated share provider
* @param callable $callback
*/
public function addCloudFederationProvider($resourceType, $displayName, callable $callback) {
$this->cloudFederationProvider[$resourceType] = [
'resourceType' => $resourceType,
'displayName' => $displayName,
'callback' => $callback,
];
}
/**
* remove cloud federation provider
*
* @param string $providerId
*/
public function removeCloudFederationProvider($providerId) {
unset($this->cloudFederationProvider[$providerId]);
}
/**
* get a list of all cloudFederationProviders
*
* @return array [resourceType => ['resourceType' => $resourceType, 'displayName' => $displayName, 'callback' => callback]]
*/
public function getAllCloudFederationProviders() {
return $this->cloudFederationProvider;
}
/**
* get a specific cloud federation provider
*
* @param string $resourceType
* @return ICloudFederationProvider
* @throws ProviderDoesNotExistsException
*/
public function getCloudFederationProvider($resourceType) {
if (isset($this->cloudFederationProvider[$resourceType])) {
return call_user_func($this->cloudFederationProvider[$resourceType]['callback']);
} else {
throw new ProviderDoesNotExistsException($resourceType);
}
}
public function sendShare(ICloudFederationShare $share) {
$cloudID = $this->cloudIdManager->resolveCloudId($share->getShareWith());
$ocmEndPoint = $this->getOCMEndPoint($cloudID->getRemote());
if (empty($ocmEndPoint)) {
return false;
}
$client = $this->httpClientService->newClient();
try {
$response = $client->post($ocmEndPoint . '/shares', [
'body' => json_encode($share->getShare()),
'headers' => ['content-type' => 'application/json'],
'timeout' => 10,
'connect_timeout' => 10,
]);
if ($response->getStatusCode() === Http::STATUS_CREATED) {
$result = json_decode($response->getBody(), true);
return (is_array($result)) ? $result : [];
}
} catch (\Exception $e) {
$this->logger->debug($e->getMessage(), ['exception' => $e]);
// if flat re-sharing is not supported by the remote server
// we re-throw the exception and fall back to the old behaviour.
// (flat re-shares has been introduced in Nextcloud 9.1)
if ($e->getCode() === Http::STATUS_INTERNAL_SERVER_ERROR) {
throw $e;
}
}
return false;
}
/**
* @param string $url
* @param ICloudFederationNotification $notification
* @return array|false
*/
public function sendNotification($url, ICloudFederationNotification $notification) {
$ocmEndPoint = $this->getOCMEndPoint($url);
if (empty($ocmEndPoint)) {
return false;
}
$client = $this->httpClientService->newClient();
try {
$response = $client->post($ocmEndPoint . '/notifications', [
'body' => json_encode($notification->getMessage()),
'headers' => ['content-type' => 'application/json'],
'timeout' => 10,
'connect_timeout' => 10,
]);
if ($response->getStatusCode() === Http::STATUS_CREATED) {
$result = json_decode($response->getBody(), true);
return (is_array($result)) ? $result : [];
}
} catch (\Exception $e) {
// log the error and return false
$this->logger->error('error while sending notification for federated share: ' . $e->getMessage(), ['exception' => $e]);
}
return false;
}
/**
* check if the new cloud federation API is ready to be used
*
* @return bool
*/
public function isReady() {
return $this->appManager->isEnabledForUser('cloud_federation_api');
}
/**
* check if server supports the new OCM api and ask for the correct end-point
*
* @param string $url full base URL of the cloud server
* @return string
*/
protected function getOCMEndPoint($url) {
if (isset($this->ocmEndPoints[$url])) {
return $this->ocmEndPoints[$url];
}
$client = $this->httpClientService->newClient();
try {
$response = $client->get($url . '/ocm-provider/', ['timeout' => 10, 'connect_timeout' => 10]);
} catch (\Exception $e) {
$this->ocmEndPoints[$url] = '';
return '';
}
$result = $response->getBody();
$result = json_decode($result, true);
$supportedVersion = isset($result['apiVersion']) && $result['apiVersion'] === $this->supportedAPIVersion;
if (isset($result['endPoint']) && $supportedVersion) {
$this->ocmEndPoints[$url] = $result['endPoint'];
return $result['endPoint'];
}
$this->ocmEndPoints[$url] = '';
return '';
}
}
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