Move OC.EventSource to the server bundle

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

2 files changed, 170 insertions, 0 deletions

diff --git a/core/src/OC/eventsource.js b/core/src/OC/eventsource.js
new file mode 100644
index 00000000000..4851aa3816d
--- /dev/null
+++ b/core/src/OC/eventsource.js
@@ -0,0 +1,168 @@
+/**
+ * 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
+ *
+ * use server side events with caution, too many open requests can hang the
+ * server
+ */
+
+/* global EventSource */
+
+import $ from 'jquery'
+
+/**
+ * Create a new event source
+ * @param {string} src
+ * @param {object} [data] to be send as GET
+ *
+ * @constructs OCEventSource
+ */
+const OCEventSource = function (src, data) {
+	var dataStr = '';
+	var name;
+	var joinChar;
+	this.typelessListeners = [];
+	this.closed = false;
+	this.listeners = {};
+	if (data) {
+		for (name in data) {
+			dataStr += name + '=' + encodeURIComponent(data[name]) + '&';
+		}
+	}
+	dataStr += 'requesttoken=' + encodeURIComponent(oc_requesttoken);
+	if (!this.useFallBack && typeof EventSource !== 'undefined') {
+		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 {
+		var iframeId = 'oc_eventsource_iframe_' + OCEventSource.iframeCount;
+		OCEventSource.fallBackSources[OCEventSource.iframeCount] = this;
+		this.iframe = $('<iframe/>');
+		this.iframe.attr('id', iframeId);
+		this.iframe.hide();
+
+		joinChar = '&';
+		if (src.indexOf('?') === -1) {
+			joinChar = '?';
+		}
+		this.iframe.attr('src', src + joinChar + 'fallback=true&fallback_id=' + OCEventSource.iframeCount + '&' + dataStr);
+		$('body').append(this.iframe);
+		this.useFallBack = true;
+		OCEventSource.iframeCount++;
+	}
+	//add close listener
+	this.listen('__internal__', function (data) {
+		if (data === 'close') {
+			this.close();
+		}
+	}.bind(this));
+};
+OCEventSource.fallBackSources = [];
+OCEventSource.iframeCount = 0;//number of fallback iframes
+OCEventSource.fallBackCallBack = function (id, type, data) {
+	OCEventSource.fallBackSources[id].fallBackCallBack(type, data);
+};
+OCEventSource.prototype = {
+	typelessListeners: [],
+	iframe: null,
+	listeners: {},//only for fallback
+	useFallBack: false,
+	/**
+	 * Fallback callback for browsers that don't have the
+	 * native EventSource object.
+	 *
+	 * Calls the registered listeners.
+	 *
+	 * @private
+	 * @param {String} type event type
+	 * @param {Object} data received data
+	 */
+	fallBackCallBack: function (type, data) {
+		var i;
+		// ignore messages that might appear after closing
+		if (this.closed) {
+			return;
+		}
+		if (type) {
+			if (typeof this.listeners.done !== 'undefined') {
+				for (i = 0; i < this.listeners[type].length; i++) {
+					this.listeners[type][i](data);
+				}
+			}
+		} else {
+			for (i = 0; i < this.typelessListeners.length; i++) {
+				this.typelessListeners[i](data);
+			}
+		}
+	},
+	lastLength: 0,//for fallback
+	/**
+	 * 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) {
+				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 {
+				this.typelessListeners.push(callback);
+			}
+		}
+	},
+	/**
+	 * Closes this event source.
+	 */
+	close: function () {
+		this.closed = true;
+		if (typeof this.source !== 'undefined') {
+			this.source.close();
+		}
+	}
+};
+
+export default OCEventSource;
diff --git a/core/src/OC/index.js b/core/src/OC/index.js
index e7a975e0827..e988a76e273 100644
--- a/core/src/OC/index.js
+++ b/core/src/OC/index.js
@@ -24,6 +24,7 @@ import Backbone from 'backbone';
 import Apps from './apps'
 import AppConfig from './appconfig'
 import ContactsMenu from './contactsmenu';
+import EventSource from './eventsource'
 import {davCall, davSync} from './backbone-webdav';
 
 // Patch Backbone for DAV
@@ -37,5 +38,6 @@ export default {
 	Apps,
 	AppConfig,
 	Backbone,
+	EventSource,
 	ContactsMenu,
 };