143 lines
3.7 KiB
JavaScript
143 lines
3.7 KiB
JavaScript
/**
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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
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* (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 caution, too many open requests can hang the
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* server
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*/
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/* global EventSource */
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/**
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* Create a new event source
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* @param {string} src
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* @param {object} [data] to be send as GET
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*/
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OC.EventSource=function(src,data){
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var dataStr='';
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var name;
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var joinChar;
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this.typelessListeners=[];
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this.closed = false;
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this.listeners={};
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if(data){
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for(name in data){
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dataStr+=name+'='+encodeURIComponent(data[name])+'&';
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}
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}
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dataStr+='requesttoken='+oc_requesttoken;
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if(!this.useFallBack && typeof EventSource !== 'undefined'){
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joinChar = '&';
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if(src.indexOf('?') === -1) {
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joinChar = '?';
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}
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this.source= new EventSource(src+joinChar+dataStr);
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this.source.onmessage=function(e){
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for(var i=0;i<this.typelessListeners.length;i++){
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this.typelessListeners[i](JSON.parse(e.data));
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}
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}.bind(this);
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}else{
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var iframeId='oc_eventsource_iframe_'+OC.EventSource.iframeCount;
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OC.EventSource.fallBackSources[OC.EventSource.iframeCount]=this;
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this.iframe=$('<iframe/>');
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this.iframe.attr('id',iframeId);
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this.iframe.hide();
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joinChar = '&';
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if(src.indexOf('?') === -1) {
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joinChar = '?';
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}
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this.iframe.attr('src',src+joinChar+'fallback=true&fallback_id='+OC.EventSource.iframeCount+'&'+dataStr);
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$('body').append(this.iframe);
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this.useFallBack=true;
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OC.EventSource.iframeCount++;
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}
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//add close listener
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this.listen('__internal__',function(data){
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if(data === 'close'){
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this.close();
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}
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}.bind(this));
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};
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OC.EventSource.fallBackSources=[];
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OC.EventSource.iframeCount=0;//number of fallback iframes
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OC.EventSource.fallBackCallBack=function(id,type,data){
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OC.EventSource.fallBackSources[id].fallBackCallBack(type,data);
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};
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OC.EventSource.prototype={
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typelessListeners:[],
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iframe:null,
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listeners:{},//only for fallback
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useFallBack:false,
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fallBackCallBack:function(type,data){
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var i;
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// ignore messages that might appear after closing
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if (this.closed) {
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return;
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}
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if(type){
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if (typeof this.listeners.done !== 'undefined') {
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for(i=0;i<this.listeners[type].length;i++){
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this.listeners[type][i](data);
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}
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}
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}else{
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for(i=0;i<this.typelessListeners.length;i++){
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this.typelessListeners[i](data);
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}
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}
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},
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lastLength:0,//for fallback
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listen:function(type,callback){
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if(callback && callback.call){
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if(type){
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if(this.useFallBack){
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if(!this.listeners[type]){
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this.listeners[type]=[];
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}
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this.listeners[type].push(callback);
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}else{
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this.source.addEventListener(type,function(e){
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if (typeof e.data !== 'undefined') {
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callback(JSON.parse(e.data));
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} else {
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callback('');
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}
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},false);
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}
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}else{
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this.typelessListeners.push(callback);
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}
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}
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},
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close:function(){
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this.closed = true;
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if (typeof this.source !== 'undefined') {
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this.source.close();
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}
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}
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};
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