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/**
* SPDX-FileCopyrightText: 2019 Nextcloud GmbH and Nextcloud contributors
* SPDX-FileCopyrightText: 2015 ownCloud, Inc.
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
/* eslint-disable */
import $ from 'jquery'
import { getToken } from './requesttoken.js'
/**
* 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(getToken())
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></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
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