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<?php
/**
* @copyright Copyright (c) 2019 Julius Härtl <jus@bitgrid.net>
*
* @author Julius Härtl <jus@bitgrid.net>
*
* @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 OCA\Richdocuments\Service;
use OCA\Federation\TrustedServers;
use OCA\Files_Sharing\External\Storage as SharingExternalStorage;
use OCA\Richdocuments\TokenManager;
use OCP\AppFramework\Http\RedirectResponse;
use OCP\AppFramework\QueryException;
use OCP\Files\File;
use OCP\Files\InvalidPathException;
use OCP\Files\NotFoundException;
use OCP\Http\Client\IClientService;
use OCP\ICache;
use OCP\ICacheFactory;
use OCP\IConfig;
use OCP\ILogger;
class FederationService {
/** @var ICache */
private $cache;
/** @var IClientService */
private $clientService;
/** @var ILogger */
private $logger;
/** @var TrustedServers */
private $trustedServers;
/** @var IConfig */
private $config;
/** @var TokenManager */
private $tokenManager;
public function __construct(ICacheFactory $cacheFactory, IClientService $clientService, ILogger $logger, TokenManager $tokenManager, IConfig $config) {
$this->cache = $cacheFactory->createLocal('richdocuments_remote/');
$this->clientService = $clientService;
$this->logger = $logger;
$this->tokenManager = $tokenManager;
$this->config = $config;
try {
$this->trustedServers = \OC::$server->query( \OCA\Federation\TrustedServers::class);
} catch (QueryException $e) {}
}
/**
* @param $remote
* @return string
* @throws \Exception
*/
public function getRemoteCollaboraURL($remote) {
if (!$this->isTrustedRemote($remote)) {
throw new \Exception('Unable to determine collabora URL of remote server ' . $remote . ' - Remote is not a trusted server');
}
if ($remoteCollabora = $this->cache->get('richdocuments_remote/' . $remote)) {
return $remoteCollabora;
}
try {
$client = $this->clientService->newClient();
$response = $client->get($remote . '/ocs/v2.php/apps/richdocuments/api/v1/federation?format=json', ['timeout' => 5]);
$data = \json_decode($response->getBody(), true);
$remoteCollabora = $data['ocs']['data']['wopi_url'];
$this->cache->set('richdocuments_remote/' . $remote, $remoteCollabora, 3600);
return $remoteCollabora;
} catch (\Throwable $e) {
$this->logger->info('Unable to determine collabora URL of remote server ' . $remote);
$this->cache->set('richdocuments_remote/' . $remote, '', 300);
}
return '';
}
public function isTrustedRemote($domainWithPort) {
if (strpos($domainWithPort, 'http://') === 0 || strpos($domainWithPort, 'https://') === 0) {
$port = parse_url($domainWithPort, PHP_URL_PORT);
$domainWithPort = parse_url($domainWithPort, PHP_URL_HOST) . ($port ? ':' . $port : '');
}
if ($this->trustedServers !== null && $this->trustedServers->isTrustedServer($domainWithPort)) {
return true;
}
$domain = $this->getDomainWithoutPort($domainWithPort);
$trustedList = $this->config->getSystemValue('gs.trustedHosts', []);
if (!is_array($trustedList)) {
return false;
}
foreach ($trustedList as $trusted) {
if (!is_string($trusted)) {
break;
}
$regex = '/^' . implode('[-\.a-zA-Z0-9]*', array_map(function ($v) {
return preg_quote($v, '/');
}, explode('*', $trusted))) . '$/i';
if (preg_match($regex, $domain) || preg_match($regex, $domainWithPort)) {
return true;
}
}
return false;
}
/**
* Strips a potential port from a domain (in format domain:port)
* @param string $host
* @return string $host without appended port
*/
private function getDomainWithoutPort($host) {
$pos = strrpos($host, ':');
if ($pos !== false) {
$port = substr($host, $pos + 1);
if (is_numeric($port)) {
$host = substr($host, 0, $pos);
}
}
return $host;
}
public function getRemoteDirectUrl($remote, $shareToken, $filePath) {
if ($this->getRemoteCollaboraURL() === '') {
return '';
}
try {
$client = $this->clientService->newClient();
$response = $client->post($remote . '/ocs/v2.php/apps/richdocuments/api/v1/federation/direct?format=json', [
'timeout' => 5,
'body' => [
'shareToken' => $shareToken,
'filePath' => $filePath
]
]);
$data = \json_decode($response->getBody(), true);
return $data['ocs']['data'];
} catch (\Throwable $e) {
$this->logger->info('Unable to determine collabora URL of remote server ' . $remote);
}
return null;
}
public function getRemoteFileDetails($remote, $remoteToken) {
if (!$this->isTrustedRemote($remote)) {
$this->logger->info('Unable to determine collabora URL of remote server ' . $remote . ' - Remote is not a trusted server');
return null;
}
try {
$client = $this->clientService->newClient();
$response = $client->post($remote . '/ocs/v2.php/apps/richdocuments/api/v1/federation?format=json', [
'timeout' => 5,
'body' => [
'token' => $remoteToken
]
]);
$data = \json_decode($response->getBody(), true);
return $data['ocs']['data'];
} catch (\Throwable $e) {
$this->logger->info('Unable to determine collabora URL of remote server ' . $remote);
}
return null;
}
/**
* @param File $item
* @return string|null
* @throws NotFoundException
* @throws InvalidPathException
*/
public function getRemoteRedirectURL(File $item, $direct = null) {
if ($item->getStorage()->instanceOfStorage(SharingExternalStorage::class)) {
$remote = $item->getStorage()->getRemote();
$remoteCollabora = $this->getRemoteCollaboraURL($remote);
if ($remoteCollabora !== '') {
if ($direct === null) {
$wopi = $this->tokenManager->getRemoteToken($item);
} else {
$wopi = $this->tokenManager->getRemoteTokenFromDirect($item, $direct->getUid());
}
$url = rtrim($remote, '') . '/index.php/apps/richdocuments/remote?shareToken=' . $item->getStorage()->getToken() .
'&remoteServer=' . $wopi->getServerHost() .
'&remoteServerToken=' . $wopi->getToken();
if ($item->getInternalPath() !== '') {
$url .= '&filePath=' . $item->getInternalPath();
}
return $url;
}
throw new NotFoundException('Failed to connect to remote collabora instance for ' . $item->getId());
}
return null;
}
}
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