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<?php
/**
* @copyright Copyright (c) 2017 Bjoern Schiessle <bjoern@schiessle.org>
*
* @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\OCS;
use OCP\AppFramework\Http;
use OCP\Http\Client\IClient;
use OCP\Http\Client\IClientService;
use OCP\ICache;
use OCP\ICacheFactory;
use OCP\OCS\IDiscoveryService;
class DiscoveryService implements IDiscoveryService {
/** @var ICache */
private $cache;
/** @var IClient */
private $client;
/**
* @param ICacheFactory $cacheFactory
* @param IClientService $clientService
*/
public function __construct(ICacheFactory $cacheFactory,
IClientService $clientService
) {
$this->cache = $cacheFactory->create('ocs-discovery');
$this->client = $clientService->newClient();
}
/**
* Discover OCS end-points
*
* If no valid discovery data is found the defaults are returned
*
* @param string $remote
* @param string $service the service you want to discover
* @return array
*/
public function discover($remote, $service) {
// Check the cache first
$cacheData = $this->cache->get($remote . '#' . $service);
if($cacheData) {
return json_decode($cacheData, true);
}
$discoveredServices = [];
// query the remote server for available services
try {
$response = $this->client->get($remote . '/ocs-provider/', [
'timeout' => 10,
'connect_timeout' => 10,
]);
if($response->getStatusCode() === Http::STATUS_OK) {
$decodedServices = json_decode($response->getBody(), true);
$discoveredServices = $this->getEndpoints($decodedServices, $service);
}
} catch (\Exception $e) {
// if we couldn't discover the service or any end-points we return a empty array
return [];
}
// Write into cache
$this->cache->set($remote . '#' . $service, json_encode($discoveredServices));
return $discoveredServices;
}
/**
* get requested end-points from the requested service
*
* @param $decodedServices
* @param $service
* @return array
*/
protected function getEndpoints($decodedServices, $service) {
$discoveredServices = [];
if(is_array($decodedServices) &&
isset($decodedServices['services'][$service]['endpoints'])
) {
foreach ($decodedServices['services'][$service]['endpoints'] as $endpoint => $url) {
if($this->isSafeUrl($url)) {
$discoveredServices[$endpoint] = $url;
}
}
}
return $discoveredServices;
}
/**
* Returns whether the specified URL includes only safe characters, if not
* returns false
*
* @param string $url
* @return bool
*/
protected function isSafeUrl($url) {
return (bool)preg_match('/^[\/\.\-A-Za-z0-9]+$/', $url);
}
}
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