/**
* EventSource
* https://github.com/Yaffle/EventSource
*
* Released under the MIT License (MIT)
* https://github.com/Yaffle/EventSource/blob/master/LICENSE.md
*/
/*jslint indent: 2, vars: true, plusplus: true */
/*global setTimeout, clearTimeout */
(function (global) {
"use strict";
var setTimeout = global.setTimeout;
var clearTimeout = global.clearTimeout;
var XMLHttpRequest = global.XMLHttpRequest;
var XDomainRequest = global.XDomainRequest;
var NativeEventSource = global.EventSource;
var document = global.document;
if (Object.create == null) {
Object.create = function (C) {
function F(){}
F.prototype = C;
return new F();
};
}
var k = function () {
};
function XHRWrapper(xhr) {
this.withCredentials = false;
this.responseType = "";
this.readyState = 0;
this.status = 0;
this.statusText = "";
this.responseText = "";
this.onprogress = k;
this.onreadystatechange = k;
this._contentType = "";
this._xhr = xhr;
this._sendTimeout = 0;
this._abort = k;
}
XHRWrapper.prototype.open = function (method, url) {
this._abort(true);
var that = this;
var xhr = this._xhr;
var state = 1;
var timeout = 0;
this._abort = function (silent) {
if (that._sendTimeout !== 0) {
clearTimeout(that._sendTimeout);
that._sendTimeout = 0;
}
if (state === 1 || state === 2 || state === 3) {
state = 4;
xhr.onload = k;
xhr.onerror = k;
xhr.onabort = k;
xhr.onprogress = k;
xhr.onreadystatechange = k;
// IE 8 - 9: XDomainRequest#abort() does not fire any event
// Opera < 10: XMLHttpRequest#abort() does not fire any event
xhr.abort();
if (timeout !== 0) {
clearTimeout(timeout);
timeout = 0;
}
if (!silent) {
that.readyState = 4;
that.onreadystatechange();
}
}
state = 0;
};
var onStart = function () {
if (state === 1) {
//state = 2;
var status = 0;
var statusText = "";
var contentType = undefined;
if (!("contentType" in xhr)) {
try {
status = xhr.status;
statusText = xhr.statusText;
contentType = xhr.getResponseHeader("Content-Type");
} catch (error) {
// IE < 10 throws exception for `xhr.status` when xhr.readyState === 2 || xhr.readyState === 3
// Opera < 11 throws exception for `xhr.status` when xhr.readyState === 2
// https://bugs.webkit.org/show_bug.cgi?id=29121
status = 0;
statusText = "";
contentType = undefined;
// Firefox < 14, Chrome ?, Safari ?
// https://bugs.webkit.org/show_bug.cgi?id=29658
// https://bugs.webkit.org/show_bug.cgi?id=77854
}
} else {
status = 200;
statusText = "OK";
contentType = xhr.contentType;
}
if (status !== 0) {
state = 2;
that.readyState = 2;
that.status = status;
that.statusText = statusText;
that._contentType = contentType;
that.onreadystatechange();
}
}
};
var onProgress = function () {
onStart();
if (state === 2 || state === 3) {
state = 3;
var responseText = "";
try {
responseText = xhr.responseText;
} catch (error) {
// IE 8 - 9 with XMLHttpRequest
}
that.readyState = 3;
that.responseText = responseText;
that.onprogress();
}
};
var onFinish = function () {
// Firefox 52 fires "readystatechange" (xhr.readyState === 4) without final "readystatechange" (xhr.readyState === 3)
// IE 8 fires "onload" without "onprogress"
onProgress();
if (state === 1 || state === 2 || state === 3) {
state = 4;
if (timeout !== 0) {
clearTimeout(timeout);
timeout = 0;
}
that.readyState = 4;
that.onreadystatechange();
}
};
var onReadyStateChange = function () {
if (xhr != undefined) { // Opera 12
if (xhr.readyState === 4) {
onFinish();
} else if (xhr.readyState === 3) {
onProgress();
} else if (xhr.readyState === 2) {
onStart();
}
}
};
var onTimeout = function () {
timeout = setTimeout(function () {
onTimeout();
}, 500);
if (xhr.readyState === 3) {
onProgress();
}
};
// XDomainRequest#abort removes onprogress, onerror, onload
xhr.onload = onFinish;
xhr.onerror = onFinish;
// improper fix to match Firefox behaviour, but it is better than just ignore abort
// see https://bugzilla.mozilla.org/show_bug.cgi?id=768596
// https://bugzilla.mozilla.org/show_bug.cgi?id=880200
// https://code.google.com/p/chromium/issues/detail?id=153570
// IE 8 fires "onload" without "onprogress
xhr.onabort = onFinish;
// https://bugzilla.mozilla.org/show_bug.cgi?id=736723
if (!("sendAsBinary" in XMLHttpRequest.prototype) && !("mozAnon" in XMLHttpRequest.prototype)) {
xhr.onprogress = onProgress;
}
// IE 8 - 9 (XMLHTTPRequest)
// Opera < 12
// Firefox < 3.5
// Firefox 3.5 - 3.6 - ? < 9.0
// onprogress is not fired sometimes or delayed
// see also #64
xhr.onreadystatechange = onReadyStateChange;
if ("contentType" in xhr) {
url += (url.indexOf("?", 0) === -1 ? "?" : "&") + "padding=true";
}
xhr.open(method, url, true);
if ("readyState" in xhr) {
// workaround for Opera 12 issue with "progress" events
// #91
timeout = setTimeout(function () {
onTimeout();
}, 0);
}
};
XHRWrapper.prototype.abort = function () {
this._abort(false);
};
XHRWrapper.prototype.getResponseHeader = function (name) {
return this._contentType;
};
XHRWrapper.prototype.setRequestHeader = function (name, value) {
var xhr = this._xhr;
if ("setRequestHeader" in xhr) {
xhr.setRequestHeader(name, value);
}
};
XHRWrapper.prototype.send = function () {
// loading indicator in Safari < ? (6), Chrome < 14, Firefox
if (!("ontimeout" in XMLHttpRequest.prototype) &&
document != undefined &&
document.readyState != undefined &&
document.readyState !== "complete") {
var that = this;
that._sendTimeout = setTimeout(function () {
that._sendTimeout = 0;
that.send();
}, 4);
return;
}
var xhr = this._xhr;
// withCredentials should be set after "open" for Safari and Chrome (< 19 ?)
xhr.withCredentials = this.withCredentials;
xhr.responseType = this.responseType;
try {
// xhr.send(); throws "Not enough arguments" in Firefox 3.0
xhr.send(undefined);
} catch (error1) {
// Safari 5.1.7, Opera 12
throw error1;
}
};
function XHRTransport(xhr) {
this._xhr = new XHRWrapper(xhr);
}
XHRTransport.prototype.open = function (onStartCallback, onProgressCallback, onFinishCallback, url, withCredentials, headers) {
var xhr = this._xhr;
xhr.open("GET", url);
var offset = 0;
xhr.onprogress = function () {
var responseText = xhr.responseText;
var chunk = responseText.slice(offset);
offset += chunk.length;
onProgressCallback(chunk);
};
xhr.onreadystatechange = function () {
if (xhr.readyState === 2) {
var status = xhr.status;
var statusText = xhr.statusText;
var contentType = xhr.getResponseHeader("Content-Type");
onStartCallback(status, statusText, contentType);
} else if (xhr.readyState === 4) {
onFinishCallback();
}
};
xhr.withCredentials = withCredentials;
xhr.responseType = "text";
for (var name in headers) {
if (Object.prototype.hasOwnProperty.call(headers, name)) {
xhr.setRequestHeader(name, headers[name]);
}
}
xhr.send();
};
XHRTransport.prototype.cancel = function () {
var xhr = this._xhr;
xhr.abort();
};
function EventTarget() {
this._listeners = Object.create(null);
}
function throwError(e) {
setTimeout(function () {
throw e;
}, 0);
}
EventTarget.prototype.dispatchEvent = function (event) {
event.target = this;
var typeListeners = this._listeners[event.type];
if (typeListeners != undefined) {
var length = typeListeners.length;
for (var i = 0; i < length; i += 1) {
var listener = typeListeners[i];
try {
if (typeof listener.handleEvent === "function") {
listener.handleEvent(event);
} else {
listener.call(this, event);
}
} catch (e) {
throwError(e);
}
}
}
};
EventTarget.prototype.addEventListener = function (type, listener) {
type = String(type);
var listeners = this._listeners;
var typeListeners = listeners[type];
if (typeListeners == undefined) {
typeListeners = [];
listeners[type] = typeListeners;
}
var found = false;
for (var i = 0; i < typeListeners.length; i += 1) {
if (typeListeners[i] === listener) {
found = true;
}
}
if (!found) {
typeListeners.push(listener);
}
};
EventTarget.prototype.removeEventListener = function (type, listener) {
type = String(type);
var listeners = this._listeners;
var typeListeners = listeners[type];
if (typeListeners != undefined) {
var filtered = [];
for (var i = 0; i < typeListeners.length; i += 1) {
if (typeListeners[i] !== listener) {
filtered.push(typeListeners[i]);
}
}
if (filtered.length === 0) {
delete listeners[type];
} else {
listeners[type] = filtered;
}
}
};
function Event(type) {
this.type = type;
this.target = undefined;
}
function MessageEvent(type, options) {
Event.call(this, type);
this.data = options.data;
this.lastEventId = options.lastEventId;
}
MessageEvent.prototype = Object.create(Event.prototype);
var WAITING = -1;
var CONNECTING = 0;
var OPEN = 1;
var CLOSED = 2;
var AFTER_CR = -1;
var FIELD_START = 0;
var FIELD = 1;
var VALUE_START = 2;
var VALUE = 3;
var contentTypeRegExp = /^text\/event\-stream;?(\s*charset\=utf\-8)?$/i;
var MINIMUM_DURATION = 1000;
var MAXIMUM_DURATION = 18000000;
var parseDuration = function (value, def) {
var n = parseInt(value, 10);
if (n !== n) {
n = def;
}
return clampDuration(n);
};
var clampDuration = function (n) {
return Math.min(Math.max(n, MINIMUM_DURATION), MAXIMUM_DURATION);
};
var fire = function (that, f, event) {
try {
if (typeof f === "function") {
f.call(that, event);
}
} catch (e) {
throwError(e);
}
};
function EventSourcePolyfill(url, options) {
EventTarget.call(this);
this.onopen = undefined;
this.onmessage = undefined;
this.onerror = undefined;
this.url = undefined;
this.readyState = undefined;
this.withCredentials = undefined;
this._close = undefined;
start(this, url, options);
}
function start(es, url, options) {
url = String(url);
var withCredentials = options != undefined && Boolean(options.withCredentials);
var initialRetry = clampDuration(1000);
var heartbeatTimeout = clampDuration(45000);
var lastEventId = "";
var retry = initialRetry;
var wasActivity = false;
var headers = options != undefined && options.headers != undefined ? JSON.parse(JSON.stringify(options.headers)) : undefined;
var CurrentTransport = options != undefined && options.Transport != undefined ? options.Transport : (XDomainRequest != undefined ? XDomainRequest : XMLHttpRequest);
var transport = new XHRTransport(new CurrentTransport());
var timeout = 0;
var currentState = WAITING;
var dataBuffer = "";
var lastEventIdBuffer = "";
var eventTypeBuffer = "";
var textBuffer = "";
var state = FIELD_START;
var fieldStart = 0;
var valueStart = 0;
var onStart = function (status, statusText, contentType) {
if (currentState === CONNECTING) {
if (status === 200 && contentType != undefined && contentTypeRegExp.test(contentType)) {
currentState = OPEN;
wasActivity = true;
retry = initialRetry;
es.readyState = OPEN;
var event = new Event("open");
es.dispatchEvent(event);
fire(es, es.onopen, event);
} else {
var message = "";
if (status !== 200) {
if (statusText) {
statusText = statusText.replace(/\s+/g, " ");
}
message = "EventSource's response has a status " + status + " " + statusText + " that is not 200. Aborting the connection.";
} else {
message = "EventSource's response has a Content-Type specifying an unsupported type: " + (contentType == undefined ? "-" : contentType.replace(/\s+/g, " ")) + ". Aborting the connection.";
}
throwError(new Error(message));
close();
var event = new Event("error");
es.dispatchEvent(event);
fire(es, es.onerror, event);
}
}
};
var onProgress = function (textChunk) {
if (currentState === OPEN) {
var n = -1;
for (var i = 0; i < textChunk.length; i += 1) {
var c = textChunk.charCodeAt(i);
if (c === "\n".charCodeAt(0) || c === "\r".charCodeAt(0)) {
n = i;
}
}
var chunk = (n !== -1 ? textBuffer : "") + textChunk.slice(0, n + 1);
textBuffer = (n === -1 ? textBuffer : "") + textChunk.slice(n + 1);
if (chunk !== "") {
wasActivity = true;
}
for (var position = 0; position < chunk.length; position += 1) {
var c = chunk.charCodeAt(position);
if (state === AFTER_CR && c === "\n".charCodeAt(0)) {
state = FIELD_START;
} else {
if (state === AFTER_CR) {
state = FIELD_START;
}
if (c === "\r".charCodeAt(0) || c === "\n".charCodeAt(0)) {
if (state !== FIELD_START) {
if (state === FIELD) {
valueStart = position + 1;
}
var field = chunk.slice(fieldStart, valueStart - 1);
var value = chunk.slice(valueStart + (valueStart < position && chunk.charCodeAt(valueStart) === " ".charCodeAt(0) ? 1 : 0), position);
if (field === "data") {
dataBuffer += "\n";
dataBuffer += value;
} else if (field === "id") {
lastEventIdBuffer = value;
} else if (field === "event") {
eventTypeBuffer = value;
} else if (field === "retry") {
initialRetry = parseDuration(value, initialRetry);
retry = initialRetry;
} else if (field === "heartbeatTimeout") {
heartbeatTimeout = parseDuration(value, heartbeatTimeout);
if (timeout !== 0) {
clearTimeout(timeout);
timeout = setTimeout(function () {
onTimeout();
}, heartbeatTimeout);
}
}
}
if (state === FIELD_START) {
if (dataBuffer !== "") {
lastEventId = lastEventIdBuffer;
if (eventTypeBuffer === "") {
eventTypeBuffer = "message";
}
var event = new MessageEvent(eventTypeBuffer, {
data: dataBuffer.slice(1),
lastEventId: lastEventIdBuffer
});
es.dispatchEvent(event);
if (eventTypeBuffer === "message") {
fire(es, es.onmessage, event);
}
if (currentState === CLOSED) {
return;
}
}
dataBuffer = "";
eventTypeBuffer = "";
}
state = c === "\r".charCodeAt(0) ? AFTER_CR : FIELD_START;
} else {
if (state === FIELD_START) {
fieldStart = position;
state = FIELD;
}
if (state === FIELD) {
if (c === ":".charCodeAt(0)) {
valueStart = position + 1;
state = VALUE_START;
}
} else if (state === VALUE_START) {
state = VALUE;
}
}
}
}
}
};
var onFinish = function () {
if (currentState === OPEN || currentState === CONNECTING) {
currentState = WAITING;
if (timeout !== 0) {
clearTimeout(timeout);
timeout = 0;
}
timeout = setTimeout(function () {
onTimeout();
}, retry);
retry = clampDuration(Math.min(initialRetry * 16, retry * 2));
es.readyState = CONNECTING;
var event = new Event("error");
es.dispatchEvent(event);
fire(es, es.onerror, event);
}
};
var close = function () {
currentState = CLOSED;
transport.cancel();
if (timeout !== 0) {
clearTimeout(timeout);
timeout = 0;
}
es.readyState = CLOSED;
};
var onTimeout = function () {
timeout = 0;
if (currentState !== WAITING) {
if (!wasActivity) {
throwError(new Error("No activity within " + heartbeatTimeout + " milliseconds. Reconnecting."));
transport.cancel();
} else {
wasActivity = false;
timeout = setTimeout(function () {
onTimeout();
}, heartbeatTimeout);
}
return;
}
wasActivity = false;
timeout = setTimeout(function () {
onTimeout();
}, heartbeatTimeout);
currentState = CONNECTING;
dataBuffer = "";
eventTypeBuffer = "";
lastEventIdBuffer = lastEventId;
textBuffer = "";
fieldStart = 0;
valueStart = 0;
state = FIELD_START;
// https://bugzilla.mozilla.org/show_bug.cgi?id=428916
// Request header field Last-Event-ID is not allowed by Access-Control-Allow-Headers.
var requestURL = url;
if (url.slice(0, 5) !== "data:" &&
url.slice(0, 5) !== "blob:") {
requestURL = url + (url.indexOf("?", 0) === -1 ? "?" : "&") + "lastEventId=" + encodeURIComponent(lastEventId);
}
var requestHeaders = {};
requestHeaders["Accept"] = "text/event-stream";
if (headers != undefined) {
for (var name in headers) {
if (Object.prototype.hasOwnProperty.call(headers, name)) {
requestHeaders[name] = headers[name];
}
}
}
try {
transport.open(onStart, onProgress, onFinish, requestURL, withCredentials, requestHeaders);
} catch (error) {
close();
throw error;
}
};
es.url = url;
es.readyState = CONNECTING;
es.withCredentials = withCredentials;
es._close = close;
onTimeout();
}
EventSourcePolyfill.prototype = Object.create(EventTarget.prototype);
EventSourcePolyfill.prototype.CONNECTING = CONNECTING;
EventSourcePolyfill.prototype.OPEN = OPEN;
EventSourcePolyfill.prototype.CLOSED = CLOSED;
EventSourcePolyfill.prototype.close = function () {
this._close();
};
EventSourcePolyfill.CONNECTING = CONNECTING;
EventSourcePolyfill.OPEN = OPEN;
EventSourcePolyfill.CLOSED = CLOSED;
EventSourcePolyfill.prototype.withCredentials = undefined;
global.EventSourcePolyfill = EventSourcePolyfill;
global.NativeEventSource = NativeEventSource;
if (XMLHttpRequest != undefined && (NativeEventSource == undefined || !("withCredentials" in NativeEventSource.prototype))) {
// Why replace a native EventSource ?
// https://bugzilla.mozilla.org/show_bug.cgi?id=444328
// https://bugzilla.mozilla.org/show_bug.cgi?id=831392
// https://code.google.com/p/chromium/issues/detail?id=260144
// https://code.google.com/p/chromium/issues/detail?id=225654
// ...
global.EventSource = EventSourcePolyfill;
}
}(typeof window !== 'undefined' ? window : this));