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| var original = require('original')
var parse = require('url').parse
var events = require('events')
var https = require('https')
var http = require('http')
var util = require('util')
var httpsOptions = [
'pfx', 'key', 'passphrase', 'cert', 'ca', 'ciphers',
'rejectUnauthorized', 'secureProtocol', 'servername'
]
/**
* Creates a new EventSource object
*
* @param {String} url the URL to which to connect
* @param {Object} [eventSourceInitDict] extra init params. See README for details.
* @api public
**/
function EventSource (url, eventSourceInitDict) {
var readyState = EventSource.CONNECTING
Object.defineProperty(this, 'readyState', {
get: function () {
return readyState
}
})
Object.defineProperty(this, 'url', {
get: function () {
return url
}
})
var self = this
self.reconnectInterval = 1000
function onConnectionClosed () {
if (readyState === EventSource.CLOSED) return
readyState = EventSource.CONNECTING
_emit('error', new Event('error'))
// The url may have been changed by a temporary
// redirect. If that's the case, revert it now.
if (reconnectUrl) {
url = reconnectUrl
reconnectUrl = null
}
setTimeout(function () {
if (readyState !== EventSource.CONNECTING) {
return
}
connect()
}, self.reconnectInterval)
}
var req
var lastEventId = ''
if (eventSourceInitDict && eventSourceInitDict.headers && eventSourceInitDict.headers['Last-Event-ID']) {
lastEventId = eventSourceInitDict.headers['Last-Event-ID']
delete eventSourceInitDict.headers['Last-Event-ID']
}
var discardTrailingNewline = false
var data = ''
var eventName = ''
var reconnectUrl = null
function connect () {
var options = parse(url)
var isSecure = options.protocol === 'https:'
options.headers = { 'Cache-Control': 'no-cache', 'Accept': 'text/event-stream' }
if (lastEventId) options.headers['Last-Event-ID'] = lastEventId
if (eventSourceInitDict && eventSourceInitDict.headers) {
for (var i in eventSourceInitDict.headers) {
var header = eventSourceInitDict.headers[i]
if (header) {
options.headers[i] = header
}
}
}
// Legacy: this should be specified as `eventSourceInitDict.https.rejectUnauthorized`,
// but for now exists as a backwards-compatibility layer
options.rejectUnauthorized = !(eventSourceInitDict && !eventSourceInitDict.rejectUnauthorized)
// If specify http proxy, make the request to sent to the proxy server,
// and include the original url in path and Host headers
var useProxy = eventSourceInitDict && eventSourceInitDict.proxy
if (useProxy) {
var proxy = parse(eventSourceInitDict.proxy)
isSecure = proxy.protocol === 'https:'
options.protocol = isSecure ? 'https:' : 'http:'
options.path = url
options.headers.Host = options.host
options.hostname = proxy.hostname
options.host = proxy.host
options.port = proxy.port
}
// If https options are specified, merge them into the request options
if (eventSourceInitDict && eventSourceInitDict.https) {
for (var optName in eventSourceInitDict.https) {
Iif (httpsOptions.indexOf(optName) === -1) {
continue
}
var option = eventSourceInitDict.https[optName]
Eif (option !== undefined) {
options[optName] = option
}
}
}
req = (isSecure ? https : http).request(options, function (res) {
// Handle HTTP errors
if (res.statusCode === 500 || res.statusCode === 502 || res.statusCode === 503 || res.statusCode === 504) {
_emit('error', new Event('error', {status: res.statusCode}))
onConnectionClosed()
return
}
// Handle HTTP redirects
if (res.statusCode === 301 || res.statusCode === 307) {
if (!res.headers.location) {
// Server sent redirect response without Location header.
_emit('error', new Event('error', {status: res.statusCode}))
return
}
if (res.statusCode === 307) reconnectUrl = url
url = res.headers.location
process.nextTick(connect)
return
}
if (res.statusCode !== 200) {
_emit('error', new Event('error', {status: res.statusCode}))
return self.close()
}
readyState = EventSource.OPEN
res.on('close', function () {
res.removeAllListeners('close')
res.removeAllListeners('end')
onConnectionClosed()
})
res.on('end', function () {
res.removeAllListeners('close')
res.removeAllListeners('end')
onConnectionClosed()
})
_emit('open', new Event('open'))
// text/event-stream parser adapted from webkit's
// Source/WebCore/page/EventSource.cpp
var buf = ''
res.on('data', function (chunk) {
buf += chunk
var pos = 0
var length = buf.length
while (pos < length) {
if (discardTrailingNewline) {
if (buf[pos] === '\n') {
++pos
}
discardTrailingNewline = false
}
var lineLength = -1
var fieldLength = -1
var c
for (var i = pos; lineLength < 0 && i < length; ++i) {
c = buf[i]
if (c === ':') {
Eif (fieldLength < 0) {
fieldLength = i - pos
}
} else if (c === '\r') {
discardTrailingNewline = true
lineLength = i - pos
} else if (c === '\n') {
lineLength = i - pos
}
}
if (lineLength < 0) {
break
}
parseEventStreamLine(buf, pos, fieldLength, lineLength)
pos += lineLength + 1
}
if (pos === length) {
buf = ''
} else Iif (pos > 0) {
buf = buf.slice(pos)
}
})
})
req.on('error', onConnectionClosed)
Eif (req.setNoDelay) req.setNoDelay(true)
req.end()
}
connect()
function _emit () {
if (self.listeners(arguments[0]).length > 0) {
self.emit.apply(self, arguments)
}
}
this._close = function () {
Iif (readyState === EventSource.CLOSED) return
readyState = EventSource.CLOSED
Eif (req.abort) req.abort()
Iif (req.xhr && req.xhr.abort) req.xhr.abort()
}
function parseEventStreamLine (buf, pos, fieldLength, lineLength) {
if (lineLength === 0) {
if (data.length > 0) {
var type = eventName || 'message'
_emit(type, new MessageEvent(type, {
data: data.slice(0, -1), // remove trailing newline
lastEventId: lastEventId,
origin: original(url)
}))
data = ''
}
eventName = void 0
} else if (fieldLength > 0) {
var noValue = fieldLength < 0
var step = 0
var field = buf.slice(pos, pos + (noValue ? lineLength : fieldLength))
Iif (noValue) {
step = lineLength
} else if (buf[pos + fieldLength + 1] !== ' ') {
step = fieldLength + 1
} else {
step = fieldLength + 2
}
pos += step
var valueLength = lineLength - step
var value = buf.slice(pos, pos + valueLength)
if (field === 'data') {
data += value + '\n'
} else if (field === 'event') {
eventName = value
} else Eif (field === 'id') {
lastEventId = value
} else if (field === 'retry') {
var retry = parseInt(value, 10)
if (!Number.isNaN(retry)) {
self.reconnectInterval = retry
}
}
}
}
}
module.exports = EventSource
util.inherits(EventSource, events.EventEmitter)
EventSource.prototype.constructor = EventSource; // make stacktraces readable
['open', 'error', 'message'].forEach(function (method) {
Object.defineProperty(EventSource.prototype, 'on' + method, {
/**
* Returns the current listener
*
* @return {Mixed} the set function or undefined
* @api private
*/
get: function get () {
var listener = this.listeners(method)[0]
return listener ? (listener._listener ? listener._listener : listener) : undefined
},
/**
* Start listening for events
*
* @param {Function} listener the listener
* @return {Mixed} the set function or undefined
* @api private
*/
set: function set (listener) {
this.removeAllListeners(method)
this.addEventListener(method, listener)
}
})
})
/**
* Ready states
*/
Object.defineProperty(EventSource, 'CONNECTING', {enumerable: true, value: 0})
Object.defineProperty(EventSource, 'OPEN', {enumerable: true, value: 1})
Object.defineProperty(EventSource, 'CLOSED', {enumerable: true, value: 2})
EventSource.prototype.CONNECTING = 0
EventSource.prototype.OPEN = 1
EventSource.prototype.CLOSED = 2
/**
* Closes the connection, if one is made, and sets the readyState attribute to 2 (closed)
*
* @see https://developer.mozilla.org/en-US/docs/Web/API/EventSource/close
* @api public
*/
EventSource.prototype.close = function () {
this._close()
}
/**
* Emulates the W3C Browser based WebSocket interface using addEventListener.
*
* @param {String} type A string representing the event type to listen out for
* @param {Function} listener callback
* @see https://developer.mozilla.org/en/DOM/element.addEventListener
* @see http://dev.w3.org/html5/websockets/#the-websocket-interface
* @api public
*/
EventSource.prototype.addEventListener = function addEventListener (type, listener) {
if (typeof listener === 'function') {
// store a reference so we can return the original function again
listener._listener = listener
this.on(type, listener)
}
}
/**
* Emulates the W3C Browser based WebSocket interface using removeEventListener.
*
* @param {String} type A string representing the event type to remove
* @param {Function} listener callback
* @see https://developer.mozilla.org/en/DOM/element.removeEventListener
* @see http://dev.w3.org/html5/websockets/#the-websocket-interface
* @api public
*/
EventSource.prototype.removeEventListener = function removeEventListener (type, listener) {
Eif (typeof listener === 'function') {
listener._listener = undefined
this.removeListener(type, listener)
}
}
/**
* W3C Event
*
* @see http://www.w3.org/TR/DOM-Level-3-Events/#interface-Event
* @api private
*/
function Event (type, optionalProperties) {
Object.defineProperty(this, 'type', { writable: false, value: type, enumerable: true })
if (optionalProperties) {
for (var f in optionalProperties) {
Eif (optionalProperties.hasOwnProperty(f)) {
Object.defineProperty(this, f, { writable: false, value: optionalProperties[f], enumerable: true })
}
}
}
}
/**
* W3C MessageEvent
*
* @see http://www.w3.org/TR/webmessaging/#event-definitions
* @api private
*/
function MessageEvent (type, eventInitDict) {
Object.defineProperty(this, 'type', { writable: false, value: type, enumerable: true })
for (var f in eventInitDict) {
Eif (eventInitDict.hasOwnProperty(f)) {
Object.defineProperty(this, f, { writable: false, value: eventInitDict[f], enumerable: true })
}
}
}
|