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/**
* ownCloud - galleryplus
*
* This file is licensed under the Affero General Public License version 3 or
* later. See the COPYING file.
*
* @author Robin Appelman <icewind1991@gmail.com>
* @author Olivier Paroz <owncloud@interfasys.ch>
*
* @copyright Robin Appelman 2012-2015
* @copyright Olivier Paroz 2014-2015
*/
/**
* Wrapper for server side events
* (http://en.wikipedia.org/wiki/Server-sent_events)
*/
/* global EventSource, oc_requesttoken, Gallery */
(function (oc_requesttoken) {
"use strict";
/**
* Create a new event source
*
* Comes from core and is thus not modified too much in order to be able to easily backport
* changes in core
*
* @param {string} src
* @param {object} [data] to be send as GET
*
* @constructs Gallery.EventSource
*/
var CustomEventSource = function (src, data) {
var dataStr = '';
var joinChar;
this.typelessListeners = [];
if (data) {
for (var i = 0, keys = Object.keys(data); i < keys.length; i++) {
dataStr += keys[i] + '=' + encodeURIComponent(data[keys[i]]) + '&';
}
}
/* jshint camelcase: false */
dataStr += 'requesttoken=' + encodeURIComponent(oc_requesttoken);
if (typeof EventSource !== 'undefined') {
joinChar = '&';
if (src.indexOf('?') === -1) {
joinChar = '?';
}
var options = {};
if (EventSource.isPolyfill !== undefined) {
// 10 thumbnails * 200k per thumbnail
options.bufferSizeLimit = 10 * 200 * 1024;
options.silentTimeout = 1000;
//options.loggingEnabled = true;
}
this.source = new EventSource(src + joinChar + dataStr, options);
this.source.onmessage = function (e) {
for (var i = 0; i < this.typelessListeners.length; i++) {
this.typelessListeners[i](JSON.parse(e.data));
}
}.bind(this);
//add close listener
this.listen('__internal__', function (data) {
if (data === 'close') {
this.close();
}
}.bind(this));
}
};
CustomEventSource.prototype = {
typelessListeners: [],
/**
* Listen to a given type of events.
*
* @param {String} type event type
* @param {Function} callback event callback
*/
listen: function (type, callback) {
if (callback && callback.call) {
if (type) {
this.source.addEventListener(type, function (e) {
if (typeof e.data !== 'undefined') {
callback(JSON.parse(e.data));
} else {
callback('');
}
}, false);
} else {
this.typelessListeners.push(callback);
}
}
},
/**
* Closes this event source.
*/
close: function () {
if (typeof this.source !== 'undefined') {
this.source.close();
}
}
};
Gallery.EventSource = CustomEventSource;
})(oc_requesttoken);
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