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<?php
declare(strict_types=1);
/**
* SPDX-FileCopyrightText: 2017 Nextcloud GmbH and Nextcloud contributors
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
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 ICache $cache;
/** @var IClient */
private IClient $client;
/**
* @param ICacheFactory $cacheFactory
* @param IClientService $clientService
*/
public function __construct(ICacheFactory $cacheFactory,
IClientService $clientService
) {
$this->cache = $cacheFactory->createDistributed('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
* @param bool $skipCache We won't check if the data is in the cache. This is useful if a background job is updating the status
* @return array
*/
public function discover(string $remote, string $service, bool $skipCache = false): array {
// Check the cache first
if ($skipCache === false) {
$cacheData = $this->cache->get($remote . '#' . $service);
if ($cacheData) {
$data = json_decode($cacheData, true);
if (\is_array($data)) {
return $data;
}
}
}
$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);
if (\is_array($decodedServices)) {
$discoveredServices = $this->getEndpoints($decodedServices, $service);
}
}
} catch (\Exception $e) {
// if we couldn't discover the service or any end-points we return a empty array
}
// Write into cache
$this->cache->set($remote . '#' . $service, json_encode($discoveredServices), 60 * 60 * 24);
return $discoveredServices;
}
/**
* get requested end-points from the requested service
*
* @param array $decodedServices
* @param string $service
* @return array
*/
protected function getEndpoints(array $decodedServices, string $service): array {
$discoveredServices = [];
if (isset($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(string $url): bool {
return (bool)preg_match('/^[\/\.\-A-Za-z0-9]+$/', $url);
}
}
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