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<?php |
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/** |
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* @author Noveen Sachdeva <[email protected]> |
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* |
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* @copyright Copyright (c) 2018, ownCloud GmbH |
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* @license AGPL-3.0 |
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* |
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* This code is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU Affero General Public License, version 3, |
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* as published by the Free Software Foundation. |
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* |
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* This program 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 License, version 3, |
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* along with this program. If not, see <http://www.gnu.org/licenses/> |
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* |
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*/ |
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namespace OCA\DAV\Connector\Sabre; |
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use OCP\IUserSession; |
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use OCP\Util; |
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use Sabre\DAV\ServerPlugin; |
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use Sabre\HTTP\RequestInterface; |
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use Sabre\HTTP\ResponseInterface; |
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/** |
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* Class CorsPlugin is a plugin which adds CORS headers to the responses |
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*/ |
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class CorsPlugin extends ServerPlugin { |
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/** |
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* Reference to main server object |
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* |
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* @var \Sabre\DAV\Server |
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*/ |
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private $server; |
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/** |
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* Reference to logged in user's session |
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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 string[] |
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*/ |
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private $extraHeaders; |
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/** |
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* @param IUserSession $userSession |
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*/ |
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public function __construct(IUserSession $userSession) { |
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$this->userSession = $userSession; |
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} |
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private function getExtraHeaders(RequestInterface $request) { |
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if ($this->extraHeaders === null) { |
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// TODO: design a way to have plugins provide these |
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$this->extraHeaders['Access-Control-Allow-Headers'] = ['X-OC-Mtime', 'OC-Checksum', 'OC-Total-Length', 'Depth', 'Destination', 'Overwrite']; |
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if ($this->userSession->getUser() === null) { |
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$this->extraHeaders['Access-Control-Allow-Methods'] = [ |
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'OPTIONS', |
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'GET', |
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'HEAD', |
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'DELETE', |
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'PROPFIND', |
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'PUT', |
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'PROPPATCH', |
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'COPY', |
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'MOVE', |
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'REPORT' |
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]; |
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} else { |
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$this->extraHeaders['Access-Control-Allow-Methods'] = $this->server->getAllowedMethods($request->getPath()); |
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} |
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} |
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return $this->extraHeaders; |
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} |
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/** |
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* This initializes the plugin. |
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* |
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* This function is called by \Sabre\DAV\Server, after |
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* addPlugin is called. |
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* |
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* This method should set up the required event subscriptions. |
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* |
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* @param \Sabre\DAV\Server $server |
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* @return void |
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*/ |
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public function initialize(\Sabre\DAV\Server $server) { |
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$this->server = $server; |
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$request = $this->server->httpRequest; |
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if (!$request->hasHeader('Origin')) { |
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return; |
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} |
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$originHeader = $request->getHeader('Origin'); |
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if ($this->ignoreOriginHeader($originHeader)) { |
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return; |
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} |
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if (Util::isSameDomain($originHeader, $request->getAbsoluteUrl())) { |
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return; |
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} |
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$this->server->on('beforeMethod', [$this, 'setCorsHeaders']); |
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$this->server->on('beforeMethod:OPTIONS', [$this, 'setOptionsRequestHeaders']); |
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} |
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/** |
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* This method sets the cors headers for all requests |
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* |
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* @param RequestInterface $request |
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* @param ResponseInterface $response |
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* @return void |
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*/ |
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public function setCorsHeaders(RequestInterface $request, ResponseInterface $response) { |
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if ($request->getHeader('origin') !== null && $this->userSession->getUser() !== null) { |
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$requesterDomain = $request->getHeader('origin'); |
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$userId = $this->userSession->getUser()->getUID(); |
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$headers = \OC_Response::setCorsHeaders($userId, $requesterDomain, null, $this->getExtraHeaders($request)); |
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foreach ($headers as $key => $value) { |
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$response->addHeader($key, \implode(',', $value)); |
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} |
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} |
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} |
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/** |
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* Handles the OPTIONS request |
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* |
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* @param RequestInterface $request |
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* @param ResponseInterface $response |
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* |
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* @return false |
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* @throws \InvalidArgumentException |
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*/ |
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public function setOptionsRequestHeaders(RequestInterface $request, ResponseInterface $response) { |
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$authorization = $request->getHeader('Authorization'); |
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if ($authorization === null || $authorization === '') { |
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// Set the proper response |
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$response->setStatus(200); |
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$response = \OC_Response::setOptionsRequestHeaders($response, $this->getExtraHeaders($request)); |
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// Since All OPTIONS requests are unauthorized, we will have to return false from here |
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// If we don't return false, due to no authorization, a 401-Unauthorized will be thrown |
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// Which we don't want here |
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// Hence this sendResponse |
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$this->server->sapi->sendResponse($response); |
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return false; |
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} |
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} |
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/** |
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* in addition to schemas used by extensions we ignore empty origin header |
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* values as well as 'null' which is not valid by the specification but used |
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* by some clients. |
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* @link https://github.com/owncloud/core/pull/32120#issuecomment-407008243 |
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* |
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* @param string $originHeader |
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* @return bool |
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*/ |
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public function ignoreOriginHeader($originHeader) { |
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if (\in_array($originHeader, ['', null, 'null'], true)) { |
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return true; |
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} |
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$schema = \parse_url($originHeader, PHP_URL_SCHEME); |
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return \in_array(\strtolower($schema), ['moz-extension', 'chrome-extension']); |
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} |
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} |
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owncloud /
core
