127 lines
3.3 KiB
PHP
127 lines
3.3 KiB
PHP
<?php
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/**
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* @copyright Copyright (c) 2017 Bjoern Schiessle <bjoern@schiessle.org>
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*
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* @author Bjoern Schiessle <bjoern@schiessle.org>
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*
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* @license GNU AGPL version 3 or any later version
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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namespace OC\OCS;
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use OCP\AppFramework\Http;
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use OCP\Http\Client\IClient;
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use OCP\Http\Client\IClientService;
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use OCP\ICache;
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use OCP\ICacheFactory;
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use OCP\OCS\IDiscoveryService;
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class DiscoveryService implements IDiscoveryService {
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/** @var ICache */
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private $cache;
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/** @var IClient */
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private $client;
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/**
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* @param ICacheFactory $cacheFactory
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* @param IClientService $clientService
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*/
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public function __construct(ICacheFactory $cacheFactory,
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IClientService $clientService
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) {
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$this->cache = $cacheFactory->create('ocs-discovery');
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$this->client = $clientService->newClient();
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}
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/**
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* Discover OCS end-points
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*
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* If no valid discovery data is found the defaults are returned
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*
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* @param string $remote
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* @param string $service the service you want to discover
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* @return array
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*/
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public function discover($remote, $service) {
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// Check the cache first
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$cacheData = $this->cache->get($remote . '#' . $service);
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if($cacheData) {
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return json_decode($cacheData, true);
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}
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$discoveredServices = [];
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// query the remote server for available services
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try {
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$response = $this->client->get($remote . '/ocs-provider/', [
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'timeout' => 10,
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'connect_timeout' => 10,
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]);
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if($response->getStatusCode() === Http::STATUS_OK) {
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$decodedServices = json_decode($response->getBody(), true);
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$discoveredServices = $this->getEndpoints($decodedServices, $service);
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}
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} catch (\Exception $e) {
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// if we couldn't discover the service or any end-points we return a empty array
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return [];
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}
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// Write into cache
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$this->cache->set($remote . '#' . $service, json_encode($discoveredServices));
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return $discoveredServices;
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}
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/**
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* get requested end-points from the requested service
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*
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* @param $decodedServices
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* @param $service
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* @return array
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*/
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protected function getEndpoints($decodedServices, $service) {
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$discoveredServices = [];
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if(is_array($decodedServices) &&
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isset($decodedServices['services'][$service]['endpoints'])
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) {
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foreach ($decodedServices['services'][$service]['endpoints'] as $endpoint => $url) {
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if($this->isSafeUrl($url)) {
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$discoveredServices[$endpoint] = $url;
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}
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}
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}
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return $discoveredServices;
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}
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/**
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* Returns whether the specified URL includes only safe characters, if not
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* returns false
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*
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* @param string $url
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* @return bool
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*/
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protected function isSafeUrl($url) {
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return (bool)preg_match('/^[\/\.\-A-Za-z0-9]+$/', $url);
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}
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}
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