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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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* @author Raghu Nayyar |
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* @copyright 2016 Raghu Nayyar <[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 OC\AppFramework\Http; |
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use OCP\AppFramework\Controller; |
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use OCP\AppFramework\Http\DataDisplayResponse; |
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use OCP\Files\File; |
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use OCP\Files\IRootFolder; |
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use OCP\Files\NotFoundException; |
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use OCP\IRequest; |
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use OCP\IUserSession; |
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class SubscriptionsProxyController extends Controller { |
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/** |
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* @var IUserSession |
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*/ |
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private $userSession; |
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/** |
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* @var \OCP\Files\IRootFolder |
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*/ |
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private $storage; |
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/** |
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* @var string |
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*/ |
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private $content; |
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/** |
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* @var int |
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*/ |
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private $responseStatusCode; |
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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 IUserSession $userSession |
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* @param IRootFolder $storage |
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*/ |
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public function __construct($appName, IRequest $request, |
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IUserSession $userSession, IRootFolder $storage) { |
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parent::__construct($appName, $request); |
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$this->userSession = $userSession; |
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$this->storage = $storage; |
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$this->content = ''; |
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$this->responseStatusCode = HTTP::STATUS_OK; |
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} |
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/** |
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* @NoAdminRequired |
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* @NoCSRFRequired |
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* |
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* @param string $icsurl |
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* @return DataDisplayResponse |
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*/ |
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public function getIcsFile($icsurl) { |
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try { |
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$file = $this->storage->get('/' . basename($icsurl)); |
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if ($file instanceof File) { |
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$date = new \DateTime(); |
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if ($date->getTimestamp() - $file->getMtime() > 3600) { |
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$this->fetchFile($file, $icsurl); |
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} else { |
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$this->content = $file->getContent(); |
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} |
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} |
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} catch (NotFoundException $e) { |
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$file = $this->createFile($this->userSession->getUser()->getUID(), $icsurl); |
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$this->fetchFile($file, $icsurl); |
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} |
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return new DataDisplayResponse($this->content, $this->responseStatusCode, [ |
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'content-type' => 'text/calendar', |
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'Etag' => '"' . md5($this->content) . '"' |
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]); |
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} |
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/** |
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* @param string $url |
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* @return boolean |
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* @throws \Exception |
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*/ |
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private function checkHeaders($url) { |
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stream_context_set_default( |
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array( |
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'http' => array( |
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'method' => 'HEAD', |
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'ignore_errors'=> true |
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) |
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) |
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); |
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$headers = array_change_key_case(get_headers($url, 1)); |
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if (isset($headers['content-length']) && $headers['content-length'] > 5242880) // 5 MB |
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throw new \Exception("Calendar subscription file is bigger than the maximum file size. Aborting download."); |
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} |
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/** |
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* @param File $file |
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* @param $icsurl |
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* @return null|string |
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*/ |
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private function fetchFile(File $file, $icsurl) { |
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try { |
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$this->checkHeaders($icsurl); |
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$opts = array('http' => array('method' => 'GET', 'header' => "Content-Type: text/calendar\r\n", 'timeout' => 60)); |
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$context = stream_context_create($opts); |
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$content = file_get_contents($icsurl, false, $context, 0, 5242880); |
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// check if contents starts as a calendar file : it's something ¯\_(ツ)_/¯ |
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if (substr($content, 0, 15) === 'BEGIN:VCALENDAR' || substr($content, 0, 12) === 'BEGIN:VEVENT') { |
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$this->content = $content; |
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$file->putContent($this->content); |
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} |
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} catch (\Exception $e) { |
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$this->responseStatusCode = HTTP::STATUS_REQUEST_ENTITY_TOO_LARGE; |
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} |
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} |
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/** |
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* @param int $userId |
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* @param string $url |
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* @return File |
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*/ |
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private function createFile($userId, $url) { |
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$folder = $this->getFolder($userId); |
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$file = $folder->newFile(basename($url)); |
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return $file; |
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} |
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/** |
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* @param $userId |
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* @return IRootFolder |
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*/ |
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private function getFolder() { |
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$path = '/CalendarSubscriptions'; |
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if ($this->storage->nodeExists($path)) { |
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$folder = $this->storage->get($path); |
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} else { |
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$folder = $this->storage->newFolder($path); |
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} |
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return $folder; |
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} |
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} |
owncloud /
calendar
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