133 lines
3.9 KiB
PHP
133 lines
3.9 KiB
PHP
<?php
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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 <bartv@thisnet.nl>
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* @author Christian Oliff <christianoliff@yahoo.com>
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* @author Christoph Wurst <christoph@winzerhof-wurst.at>
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* @author Felix Moeller <mail@felixmoeller.de>
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* @author Lukas Reschke <lukas@statuscode.ch>
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* @author Morris Jobke <hey@morrisjobke.de>
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* @author Robin Appelman <robin@icewind.nl>
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* @author Thomas Müller <thomas.mueller@tmit.eu>
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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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/**
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* wrapper for server side events (https://en.wikipedia.org/wiki/Server-sent_events)
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* includes a fallback for older browsers and IE
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*
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* use server side events with caution, to many open requests can hang the server
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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 $started = false;
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protected function init() {
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if ($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 (!\OC::$server->getRequest()->passesStrictCookieCheck()) {
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header('Location: '.\OC::$WEBROOT);
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exit();
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}
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if (!\OC::$server->getRequest()->passesCSRFCheck()) {
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$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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