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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\Db\Direct;
use OCA\Richdocuments\Db\Wopi;
use OCA\Richdocuments\Db\WopiMapper;
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;
use OCP\IRequest;
use OCP\Share\IShare;
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;
/** @var IRequest */
private $request;
public function __construct(ICacheFactory $cacheFactory, IClientService $clientService, ILogger $logger, TokenManager $tokenManager, IConfig $config, IRequest $request) {
$this->cache = $cacheFactory->createDistributed('richdocuments_remote/');
$this->clientService = $clientService;
$this->logger = $logger;
$this->tokenManager = $tokenManager;
$this->config = $config;
$this->request = $request;
try {
$this->trustedServers = \OC::$server->query( \OCA\Federation\TrustedServers::class);
} catch (QueryException $e) {}
}
/**
* @param $remote
* @return string
* @throws \Exception
*/
public function getRemoteCollaboraURL($remote) {
// If no protocol is provided we default to https
if (strpos($remote, 'http://') !== 0 && strpos($remote, 'https://') !== 0) {
$remote = 'https://' . $remote;
}
if (!$this->isTrustedRemote($remote)) {
throw new \Exception('Unable to determine collabora URL of remote server ' . $remote . ' - Remote is not a trusted server');
}
$remoteCollabora = $this->cache->get('richdocuments_remote/' . $remote);
if ($remoteCollabora !== null) {
return $remoteCollabora;
}
try {
$client = $this->clientService->newClient();
$response = $client->get($remote . '/ocs/v2.php/apps/richdocuments/api/v1/federation?format=json', ['timeout' => 30]);
$data = \json_decode($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, ['exception' => $e]);
$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);
$trustedList = array_merge($this->config->getSystemValue('gs.trustedHosts', []), [$this->request->getServerHost()]);
if (!is_array($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;
}
/** @return Wopi|null */
public function getRemoteFileDetails(string $remote, string $remoteToken) {
$cacheKey = md5($remote . $remoteToken);
$remoteWopi = $this->cache->get($cacheKey);
if ($remoteWopi !== null) {
return Wopi::fromParams($remoteWopi);
}
if (!$this->isTrustedRemote($remote)) {
$this->logger->info('COOL-Federation-Source: Unable to determine collabora URL of remote server ' . $remote . ' for token ' . $remoteToken . ' - Remote is not a trusted server');
return null;
}
try {
$this->logger->debug('COOL-Federation-Source: Fetching remote file details from ' . $remote . ' for token ' . $remoteToken);
$client = $this->clientService->newClient();
$response = $client->post($remote . '/ocs/v2.php/apps/richdocuments/api/v1/federation?format=json', [
'timeout' => 30,
'body' => [
'token' => $remoteToken
]
]);
$responseBody = $response->getBody();
$data = \json_decode($responseBody, true, 512);
$this->logger->debug('COOL-Federation-Source: Received remote file details for ' . $remoteToken . ' from ' . $remote . ': ' . json_encode($data['ocs']['data']));
$this->cache->set($cacheKey, $data['ocs']['data']);
return Wopi::fromParams($data['ocs']['data']);
} catch (\Throwable $e) {
$this->logger->logException($e, ['message' => 'COOL-Federation-Source: Unable to fetch remote file details for ' . $remoteToken . ' from ' . $remote ]);
}
return null;
}
/**
* @param File $item
* @return string|null
* @throws NotFoundException
* @throws InvalidPathException
*/
public function getRemoteRedirectURL(File $item, Direct $direct = null, IShare $share = null) {
if (!$item->getStorage()->instanceOfStorage(SharingExternalStorage::class)) {
return null;
}
$remote = $item->getStorage()->getRemote();
$remoteCollabora = $this->getRemoteCollaboraURL($remote);
if ($remoteCollabora !== '') {
$shareToken = $share ? $share->getToken() : null;
$wopi = $this->tokenManager->newInitiatorToken($remote, $item, $shareToken, ($direct !== null), ($direct ? $direct->getUid() : null));
$initiatorServer = $wopi->getServerHost();
$initiatorToken = $wopi->getToken();
/**
* If the request to open a file originates from a direct token we might need to fetch the initiator user details when the initiator wopi token is accessed
* as the user might origin on a 3rd instance
*/
if ($direct && !empty($direct->getInitiatorHost()) && !empty($direct->getInitiatorToken())) {
$this->tokenManager->extendWithInitiatorUserToken($wopi, $direct->getInitiatorHost(), $direct->getInitiatorToken());
}
$url = rtrim($remote, '/') . '/index.php/apps/richdocuments/remote?shareToken=' . $item->getStorage()->getToken() .
'&remoteServer=' . $initiatorServer .
'&remoteServerToken=' . $initiatorToken;
if ($item->getInternalPath() !== '') {
$url .= '&filePath=' . $item->getInternalPath();
}
return $url;
}
throw new NotFoundException('Failed to connect to remote collabora instance for ' . $item->getId());
}
}
|
