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<?php |
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use OCP\IRequest; |
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/** |
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* @copyright Copyright (c) 2016, ownCloud, Inc. |
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* |
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* @author Bart Visscher <[email protected]> |
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* @author Christian Oliff <[email protected]> |
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* @author Christoph Wurst <[email protected]> |
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* @author Felix Moeller <[email protected]> |
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* @author Lukas Reschke <[email protected]> |
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* @author Morris Jobke <[email protected]> |
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* @author Robin Appelman <[email protected]> |
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* @author Thomas Müller <[email protected]> |
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* |
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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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class OC_EventSource implements \OCP\IEventSource { |
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/** |
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* @var bool |
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*/ |
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private $fallback; |
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/** |
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* @var int |
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*/ |
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private $fallBackId = 0; |
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/** |
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* @var bool |
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*/ |
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private $started = false; |
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private IRequest $request; |
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public function __construct(IRequest $request) { |
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$this->request = $request; |
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} |
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protected function init() { |
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if ($this->started) { |
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return; |
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} |
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$this->started = true; |
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// prevent php output buffering, caching and nginx buffering |
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OC_Util::obEnd(); |
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header('Cache-Control: no-cache'); |
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header('X-Accel-Buffering: no'); |
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$this->fallback = isset($_GET['fallback']) and $_GET['fallback'] == 'true'; |
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if ($this->fallback) { |
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$this->fallBackId = (int)$_GET['fallback_id']; |
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/** |
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* FIXME: The default content-security-policy of ownCloud forbids inline |
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* JavaScript for security reasons. IE starting on Windows 10 will |
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* however also obey the CSP which will break the event source fallback. |
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* |
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* As a workaround thus we set a custom policy which allows the execution |
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* of inline JavaScript. |
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* |
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* @link https://github.com/owncloud/core/issues/14286 |
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*/ |
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header("Content-Security-Policy: default-src 'none'; script-src 'unsafe-inline'"); |
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header("Content-Type: text/html"); |
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echo str_repeat('<span></span>' . PHP_EOL, 10); //dummy data to keep IE happy |
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} else { |
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header("Content-Type: text/event-stream"); |
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} |
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if (!$this->request->passesStrictCookieCheck()) { |
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header('Location: '.\OC::$WEBROOT); |
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exit(); |
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} |
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if (!$this->request->passesCSRFCheck()) { |
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$this->send('error', 'Possible CSRF attack. Connection will be closed.'); |
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$this->close(); |
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exit(); |
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} |
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flush(); |
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} |
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/** |
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* send a message to the client |
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* |
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* @param string $type |
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* @param mixed $data |
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* |
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* @throws \BadMethodCallException |
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* if only one parameter is given, a typeless message will be send with that parameter as data |
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* @suppress PhanDeprecatedFunction |
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*/ |
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public function send($type, $data = null) { |
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if ($data and !preg_match('/^[A-Za-z0-9_]+$/', $type)) { |
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throw new BadMethodCallException('Type needs to be alphanumeric ('. $type .')'); |
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} |
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$this->init(); |
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if (is_null($data)) { |
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$data = $type; |
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$type = null; |
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} |
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if ($this->fallback) { |
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$response = '<script type="text/javascript">window.parent.OC.EventSource.fallBackCallBack(' |
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. $this->fallBackId . ',"' . $type . '",' . OC_JSON::encode($data) . ')</script>' . PHP_EOL; |
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echo $response; |
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} else { |
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if ($type) { |
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echo 'event: ' . $type . PHP_EOL; |
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} |
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echo 'data: ' . OC_JSON::encode($data) . PHP_EOL; |
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} |
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echo PHP_EOL; |
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flush(); |
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} |
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/** |
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* close the connection of the event source |
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*/ |
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public function close() { |
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$this->send('__internal__', 'close'); //server side closing can be an issue, let the client do it |
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} |
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} |
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nextcloud /
server
In general, usage of exit should be done with care and only when running in a scripting context like a CLI script.