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/** |
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* Nextcloud - Gallery |
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* |
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* This file is licensed under the Affero General Public License version 3 or |
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* later. See the COPYING file. |
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* |
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* @author Robin Appelman <[email protected]> |
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* @author Olivier Paroz <[email protected]> |
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* |
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* @copyright Robin Appelman 2017 |
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* @copyright Olivier Paroz 2017 |
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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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*/ |
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/* global EventSource, oc_requesttoken, Gallery */ |
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(function (oc_requesttoken) { |
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"use strict"; |
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/** |
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* Create a new event source |
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* |
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* Comes from core and is thus not modified too much in order to be able to easily backport |
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* changes in core |
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* |
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* @param {string} src |
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* @param {object} [data] to be send as GET |
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* @constructor |
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*/ |
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var CustomEventSource = function (src, data) { |
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var dataStr = ''; |
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var joinChar; |
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this.typelessListeners = []; |
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if (data) { |
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for (var i = 0, keys = Object.keys(data); i < keys.length; i++) { |
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dataStr += keys[i] + '=' + encodeURIComponent(data[keys[i]]) + '&'; |
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} |
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} |
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/* jshint camelcase: false */ |
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dataStr += 'requesttoken=' + encodeURIComponent(oc_requesttoken); |
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if (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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var options = {}; |
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if (EventSource.isPolyfill !== undefined) { |
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// 10 thumbnails * 200k per thumbnail |
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options.bufferSizeLimit = 10 * 200 * 1024; |
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//options.loggingEnabled = true; |
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} |
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this.source = new EventSource(src + joinChar + dataStr, options); |
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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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//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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}; |
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CustomEventSource.prototype = { |
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typelessListeners: [], |
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/** |
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* Listen to a given type of events. |
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* |
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* @param {String} type event type |
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* @param {Function} callback event callback |
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*/ |
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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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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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} 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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/** |
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* Closes this event source. |
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*/ |
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close: function () { |
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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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Gallery.EventSource = CustomEventSource; |
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})(oc_requesttoken); |
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nextcloud /
gallery
