137 lines
3.7 KiB
PHP
137 lines
3.7 KiB
PHP
<?php
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/**
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* @author Lukas Reschke <lukas@owncloud.com>
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*
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* @copyright Copyright (c) 2016, ownCloud, Inc.
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* @license AGPL-3.0
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*
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* This code 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, version 3,
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* as published by the Free Software Foundation.
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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, version 3,
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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 OCA\FederatedFileSharing;
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use GuzzleHttp\Exception\ClientException;
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use GuzzleHttp\Exception\ConnectException;
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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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/**
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* Class DiscoveryManager handles the discovery of endpoints used by Federated
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* Cloud Sharing.
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*
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* @package OCA\FederatedFileSharing
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*/
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class DiscoveryManager {
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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 $clientService) {
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$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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* 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 $url
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* @return bool
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*/
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private function isSafeUrl($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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* Discover the actual data and do some naive caching to ensure that the data
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* is not requested multiple times.
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*
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* If no valid discovery data is found the ownCloud defaults are returned.
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*
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* @param string $remote
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* @return array
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*/
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private function discover($remote) {
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// Check if something is in the cache
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if($cacheData = $this->cache->get($remote)) {
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return json_decode($cacheData, true);
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}
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// Default response body
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$discoveredServices = [
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'webdav' => '/public.php/webdav',
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'share' => '/ocs/v1.php/cloud/shares',
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];
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// Read the data from the response body
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try {
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$response = $this->client->get($remote . '/ocs-provider/');
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if($response->getStatusCode() === 200) {
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$decodedService = json_decode($response->getBody(), true);
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if(is_array($decodedService)) {
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$endpoints = [
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'webdav',
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'share',
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];
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foreach($endpoints as $endpoint) {
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if(isset($decodedService['services']['FEDERATED_SHARING']['endpoints'][$endpoint])) {
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$endpointUrl = (string)$decodedService['services']['FEDERATED_SHARING']['endpoints'][$endpoint];
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if($this->isSafeUrl($endpointUrl)) {
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$discoveredServices[$endpoint] = $endpointUrl;
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}
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}
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}
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}
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}
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} catch (ClientException $e) {
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// Don't throw any exception since exceptions are handled before
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} catch (ConnectException $e) {
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// Don't throw any exception since exceptions are handled before
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}
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// Write into cache
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$this->cache->set($remote, json_encode($discoveredServices));
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return $discoveredServices;
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}
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/**
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* Return the public WebDAV endpoint used by the specified remote
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*
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* @param string $host
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* @return string
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*/
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public function getWebDavEndpoint($host) {
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return $this->discover($host)['webdav'];
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}
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/**
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* Return the sharing endpoint used by the specified remote
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*
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* @param string $host
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* @return string
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*/
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public function getShareEndpoint($host) {
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return $this->discover($host)['share'];
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}
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}
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