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<?php |
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/** |
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* ownCloud - Calendar App |
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* |
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* @author Georg Ehrke |
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* @copyright 2016 Georg Ehrke <[email protected]> |
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* |
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* This library is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE |
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* License as published by the Free Software Foundation; either |
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* version 3 of the License, or any later version. |
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* |
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* This library 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 |
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* License along with this library. If not, see <http://www.gnu.org/licenses/>. |
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* |
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*/ |
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namespace OCA\Calendar\Controller; |
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use GuzzleHttp\Exception\RequestException; |
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use GuzzleHttp\Exception\ClientException; |
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use GuzzleHttp\Exception\ConnectException; |
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use OCP\AppFramework\Http; |
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use OCP\AppFramework\Http\JSONResponse; |
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use OCP\AppFramework\Http\DataDisplayResponse; |
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use OCP\AppFramework\Controller; |
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use OCP\Http\Client\IClientService; |
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use OCP\IL10N; |
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use OCP\ILogger; |
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use OCP\IRequest; |
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use Sabre\VObject\Reader; |
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class ProxyController extends Controller { |
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/** |
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* @var IClientService |
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*/ |
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protected $client; |
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/** |
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* @var IL10N |
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*/ |
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protected $l10n; |
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/** |
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* @var ILogger |
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*/ |
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protected $logger; |
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/** |
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* @param string $appName |
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* @param IRequest $request an instance of the request |
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* @param IClientService $client |
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* @param IL10N $l10n |
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* @param ILogger $logger |
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*/ |
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10 |
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public function __construct($appName, IRequest $request, |
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IClientService $client, |
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IL10N $l10n, ILogger $logger) { |
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parent::__construct($appName, $request); |
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$this->client = $client; |
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$this->l10n = $l10n; |
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$this->logger = $logger; |
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} |
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/** |
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* @NoAdminRequired |
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* |
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* @param $url |
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* @return DataDisplayResponse|JSONResponse |
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*/ |
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public function proxy($url) { |
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$client = $this->client->newClient(); |
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try { |
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$queryUrl = $url; |
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$allow_redirects = false; // try to handle redirects manually at first |
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$redirect_count = 0; |
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$max_redirects = 5; |
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$done = false; |
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// try to find a chain of 301s |
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do { |
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$clientResponse = $client->get($queryUrl, [ |
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'allow_redirects' => $allow_redirects, |
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]); |
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$statusCode = $clientResponse->getStatusCode(); |
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if ($statusCode === 301) { // 400+ goes straight to catch |
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$redirect_count++; |
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$queryUrl = $clientResponse->getHeader('Location'); |
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} elseif ($statusCode >= 300) { |
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if ($redirect_count > 0) { |
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// $redirect_count > 0 => There have been 301s before, |
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// break and return Location from last 301 |
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1 |
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break; |
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} else { |
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// this is the very first request |
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// it's being redirected, but the redirection is not |
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// permanently, just let Guzzle take care |
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$allow_redirects = [ |
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'max' => $max_redirects |
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]; |
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} |
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} else { |
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$done = true; |
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} |
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} while(!$done && $redirect_count <= $max_redirects); |
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if ($redirect_count > 0 && $redirect_count <= $max_redirects) { |
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$response = new JSONResponse([ |
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'proxy_code' => -4, |
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'new_url' => $queryUrl, |
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], Http::STATUS_BAD_REQUEST); |
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3 |
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} elseif ($done) { |
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2 |
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$icsData = $clientResponse->getBody(); |
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try { |
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Reader::read($icsData, Reader::OPTION_FORGIVING); |
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} catch(\Exception $ex) { |
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$response = new JSONResponse([ |
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'message' => $this->l10n->t('The remote server did not give us access to the calendar (HTTP 404 error)'), |
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'proxy_code' => 404 |
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], Http::STATUS_UNPROCESSABLE_ENTITY); |
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return $response; |
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} |
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$response = new DataDisplayResponse($icsData, 200); |
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$response->setHeaders([ |
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'Content-Type' => 'text/calendar', |
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]); |
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} else { |
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$response = new JSONResponse([ |
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'message' => $this->l10n->t('Too many redirects. Aborting ...'), |
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'proxy_code' => -3 |
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], Http::STATUS_UNPROCESSABLE_ENTITY); |
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} |
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} catch (ClientException $e) { |
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$error_code = $e->getResponse()->getStatusCode(); |
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$message = $e->getMessage(); |
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$this->logger->debug($message); |
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$response = new JSONResponse([ |
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'message' => $this->l10n->t('The remote server did not give us access to the calendar (HTTP {%s} error)', [ |
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(string) $error_code |
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]), |
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'proxy_code' => $error_code |
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], Http::STATUS_UNPROCESSABLE_ENTITY); |
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} catch (ConnectException $e) { |
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$this->logger->debug($e->getMessage()); |
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$response = new JSONResponse([ |
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'message' => $this->l10n->t('Error connecting to remote server'), |
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'proxy_code' => -1 |
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], Http::STATUS_UNPROCESSABLE_ENTITY); |
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} catch (RequestException $e) { |
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$this->logger->debug($e->getMessage()); |
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if (substr($url, 0, 8) === 'https://') { |
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$message = $this->l10n->t('Error requesting resource on remote server. This could possible be related to a certificate mismatch'); |
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} else { |
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1 |
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$message = $this->l10n->t('Error requesting resource on remote server'); |
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} |
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$response = new JSONResponse([ |
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'message' => $message, |
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'proxy_code' => -2, |
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], Http::STATUS_UNPROCESSABLE_ENTITY); |
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} |
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return $response; |
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} |
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} |
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nextcloud /
calendar
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