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<?php /** * ownCloud - Calendar App * * @author Georg Ehrke * @copyright 2016 Georg Ehrke <oc.list@georgehrke.com> * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE * License as published by the Free Software Foundation; either * version 3 of the License, or any later version. * * This library 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 library. If not, see <http://www.gnu.org/licenses/>. * / namespace OCA\Calendar\Controller; use GuzzleHttp\Exception\RequestException; use GuzzleHttp\Exception\ClientException; use GuzzleHttp\Exception\ConnectException; use OCA\Calendar\Http\StreamResponse; use OCP\AppFramework\Http; use OCP\AppFramework\Http\JSONResponse; use OCP\AppFramework\Controller; use OCP\Http\Client\IClientService; use OCP\IL10N; use OCP\ILogger; use OCP\IRequest; class ProxyController extends Controller { /* * @var IClientService / protected $client; /* * @var IL10N / protected $l10n; /* * @var ILogger / protected $logger; /* * @param string $appName * @param IRequest $request an instance of the request * @param IClientService $client * @param IL10N $l10n * @param ILogger $logger / public function __construct($appName, IRequest $request, IClientService $client, IL10N $l10n, ILogger $logger) { parent::__construct($appName, $request); $this->client = $client; $this->l10n = $l10n; $this->logger = $logger; } /* * @NoAdminRequired * * @param $url * @return StreamResponse\|JSONResponse */ public function proxy($url) { $client = $this->client->newClient(); try { $queryUrl = $url; $allow_redirects = false; // try to handle redirects manually at first $redirect_count = 0; $max_redirects = 5; $done = false; // try to find a chain of 301s do { $clientResponse = $client->get($queryUrl, [ 'stream' => true, 'allow_redirects' => $allow_redirects, ]); $statusCode = $clientResponse->getStatusCode(); if ($statusCode === 301) { // 400+ goes straight to catch $redirect_count++; $queryUrl = $clientResponse->getHeader('Location'); } elseif ($statusCode >= 300) { if ($redirect_count > 0) { // $redirect_count > 0 => There have been 301s before, // break and return Location from last 301 break; } else { // this is the very first request // it's being redirected, but the redirection is not // permanently, just let Guzzle take care $allow_redirects = [ 'max' => $max_redirects ]; } } else { $done = true; } } while(!$done && $redirect_count <= $max_redirects); if ($redirect_count > 0 && $redirect_count <= $max_redirects) { $response = new JSONResponse([ 'proxy_code' => -4, 'new_url' => $queryUrl, ], Http::STATUS_BAD_REQUEST); } elseif ($done) { $response = new StreamResponse($clientResponse->getBody()); $response->setHeaders([ 'Content-Type' => 'text/calendar', ]); } else { $response = new JSONResponse([ 'message' => $this->l10n->t('Too many redirects. Aborting ...'), 'proxy_code' => -3 ], Http::STATUS_UNPROCESSABLE_ENTITY); } } catch (ClientException $e) { $error_code = $e->getResponse()->getStatusCode(); $message = $e->getMessage(); $this->logger->debug($message); $response = new JSONResponse([ 'message' => $this->l10n->t('The remote server did not give us access to the calendar (HTTP {%s} error)', [ (string) $error_code ]), 'proxy_code' => $error_code ], Http::STATUS_UNPROCESSABLE_ENTITY); } catch (ConnectException $e) { $this->logger->debug($e->getMessage()); $response = new JSONResponse([ 'message' => $this->l10n->t('Error connecting to remote server'), 'proxy_code' => -1 ], Http::STATUS_UNPROCESSABLE_ENTITY); } catch (RequestException $e) { $this->logger->debug($e->getMessage()); if (substr($url, 0, 8) === 'https://') { $message = $this->l10n->t('Error requesting resource on remote server. This could possible be related to a certificate mismatch'); } else { $message = $this->l10n->t('Error requesting resource on remote server'); } $response = new JSONResponse([ 'message' => $message, 'proxy_code' => -2, ], Http::STATUS_UNPROCESSABLE_ENTITY); } return $response; } }

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