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/**
* 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 );