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sources/core/js/eventsource.js 3.49 KB
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  /**
   * ownCloud
   *
   * @author Robin Appelman
   * @copyright 2012 Robin Appelman icewind1991@gmail.com
   *
   * This library is free software; you can redistribute it and/or
   * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
   * License as published by the Free Software Foundation; either
   * version 3 of the License, or any later version.
   *
   * This library is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU AFFERO GENERAL PUBLIC LICENSE for more details.
   *
   * You should have received a copy of the GNU Affero General Public
   * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
   *
   */
  
  /**
   * wrapper for server side events (http://en.wikipedia.org/wiki/Server-sent_events)
   * includes a fallback for older browsers and IE
   *
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   * use server side events with causion, to many open requests can hang the server
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   */
  
  /**
   * create a new event source
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   * @param string src
   * @param object data to be send as GET
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   */
  OC.EventSource=function(src,data){
  	var dataStr='';
  	this.typelessListeners=[];
  	this.listeners={};
  	if(data){
  		for(name in data){
  			dataStr+=name+'='+encodeURIComponent(data[name])+'&';
  		}
  	}
  	dataStr+='requesttoken='+oc_requesttoken;
  	if(!this.useFallBack && typeof EventSource !='undefined'){
  		var joinChar = '&';
  		if(src.indexOf('?') == -1) {
  			joinChar = '?';
  		}
  		this.source=new EventSource(src+joinChar+dataStr);
  		this.source.onmessage=function(e){
  			for(var i=0;i<this.typelessListeners.length;i++){
  				this.typelessListeners[i](JSON.parse(e.data));
  			}
  		}.bind(this);
  	}else{
  		iframeId='oc_eventsource_iframe_'+OC.EventSource.iframeCount;
  		OC.EventSource.fallBackSources[OC.EventSource.iframeCount]=this;
  		this.iframe=$('<iframe/>');
  		this.iframe.attr('id',iframeId);
  		this.iframe.hide();
  
  		var joinChar = '&';
  		if(src.indexOf('?') == -1) {
  			joinChar = '?';
  		}
  		this.iframe.attr('src',src+joinChar+'fallback=true&fallback_id='+OC.EventSource.iframeCount+'&'+dataStr);
  		$('body').append(this.iframe);
  		this.useFallBack=true;
  		OC.EventSource.iframeCount++
  	}
  	//add close listener
  	this.listen('__internal__',function(data){
  		if(data=='close'){
  			this.close();
  		}
  	}.bind(this));
  }
  OC.EventSource.fallBackSources=[];
  OC.EventSource.iframeCount=0;//number of fallback iframes
  OC.EventSource.fallBackCallBack=function(id,type,data){
  	OC.EventSource.fallBackSources[id].fallBackCallBack(type,data);
  }
  OC.EventSource.prototype={
  	typelessListeners:[],
  	iframe:null,
  	listeners:{},//only for fallback
  	useFallBack:false,
  	fallBackCallBack:function(type,data){
  		if(type){
  			if (typeof this.listeners['done'] != 'undefined') {
  				for(var i=0;i<this.listeners[type].length;i++){
  					this.listeners[type][i](data);
  				}
  			}
  		}else{
  			for(var i=0;i<this.typelessListeners.length;i++){
  				this.typelessListeners[i](data);
  			}
  		}
  	},
  	lastLength:0,//for fallback
  	listen:function(type,callback){
  		if(callback && callback.call){
  
  			if(type){
  				if(this.useFallBack){
  					if(!this.listeners[type]){
  						this.listeners[type]=[];
  					}
  					this.listeners[type].push(callback);
  				}else{
  					this.source.addEventListener(type,function(e){
  						if (typeof e.data != 'undefined') {
  							callback(JSON.parse(e.data));
  						} else {
  							callback('');
  						}
  					},false);
  				}
  			}else{
  				typelessListeners.push(callback);
  			}
  		}
  	},
  	close:function(){
  		if (typeof this.source !='undefined') {
  			this.source.close();
  		}
  	}
  }