85 lines
2.3 KiB
PHP
85 lines
2.3 KiB
PHP
<?php
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/**
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* ownCloud
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*
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* @author Robin Appelman
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* @copyright 2012 Robin Appelman icewind1991@gmail.com
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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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/**
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* wrapper for server side events (http://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 causion, to many open requests can hang the server
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*/
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class OC_EventSource{
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private $fallback;
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private $fallBackId=0;
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public function __construct() {
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OC_Util::obEnd();
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header('Cache-Control: no-cache');
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$this->fallback=isset($_GET['fallback']) and $_GET['fallback']=='true';
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if($this->fallback) {
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$this->fallBackId=$_GET['fallback_id'];
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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_Util::isCallRegistered()) {
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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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* @param string type
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* @param object data
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*
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* if only one paramater is given, a typeless message will be send with that paramater as data
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*/
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public function send($type, $data=null) {
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if(is_null($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.',"'.$type.'",'.json_encode($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: '.$type.PHP_EOL;
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}
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echo 'data: '.json_encode($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 even 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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