forked from projectmoon/tenebrous-dicebot
446 lines
13 KiB
JavaScript
446 lines
13 KiB
JavaScript
var original = require('original')
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var parse = require('url').parse
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var events = require('events')
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var https = require('https')
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var http = require('http')
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var util = require('util')
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var httpsOptions = [
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'pfx', 'key', 'passphrase', 'cert', 'ca', 'ciphers',
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'rejectUnauthorized', 'secureProtocol', 'servername', 'checkServerIdentity'
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]
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var bom = [239, 187, 191]
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var colon = 58
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var space = 32
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var lineFeed = 10
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var carriageReturn = 13
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function hasBom (buf) {
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return bom.every(function (charCode, index) {
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return buf[index] === charCode
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})
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}
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/**
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* Creates a new EventSource object
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*
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* @param {String} url the URL to which to connect
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* @param {Object} [eventSourceInitDict] extra init params. See README for details.
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* @api public
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**/
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function EventSource (url, eventSourceInitDict) {
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var readyState = EventSource.CONNECTING
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Object.defineProperty(this, 'readyState', {
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get: function () {
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return readyState
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}
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})
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Object.defineProperty(this, 'url', {
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get: function () {
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return url
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}
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})
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var self = this
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self.reconnectInterval = 1000
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self.connectionInProgress = false
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function onConnectionClosed (message) {
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if (readyState === EventSource.CLOSED) return
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readyState = EventSource.CONNECTING
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_emit('error', new Event('error', {message: message}))
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// The url may have been changed by a temporary
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// redirect. If that's the case, revert it now.
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if (reconnectUrl) {
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url = reconnectUrl
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reconnectUrl = null
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}
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setTimeout(function () {
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if (readyState !== EventSource.CONNECTING || self.connectionInProgress) {
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return
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}
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self.connectionInProgress = true
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connect()
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}, self.reconnectInterval)
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}
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var req
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var lastEventId = ''
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if (eventSourceInitDict && eventSourceInitDict.headers && eventSourceInitDict.headers['Last-Event-ID']) {
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lastEventId = eventSourceInitDict.headers['Last-Event-ID']
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delete eventSourceInitDict.headers['Last-Event-ID']
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}
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var discardTrailingNewline = false
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var data = ''
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var eventName = ''
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var reconnectUrl = null
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function connect () {
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var options = parse(url)
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var isSecure = options.protocol === 'https:'
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options.headers = { 'Cache-Control': 'no-cache', 'Accept': 'text/event-stream' }
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if (lastEventId) options.headers['Last-Event-ID'] = lastEventId
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if (eventSourceInitDict && eventSourceInitDict.headers) {
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for (var i in eventSourceInitDict.headers) {
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var header = eventSourceInitDict.headers[i]
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if (header) {
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options.headers[i] = header
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}
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}
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}
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// Legacy: this should be specified as `eventSourceInitDict.https.rejectUnauthorized`,
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// but for now exists as a backwards-compatibility layer
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options.rejectUnauthorized = !(eventSourceInitDict && !eventSourceInitDict.rejectUnauthorized)
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if (eventSourceInitDict && eventSourceInitDict.createConnection !== undefined) {
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options.createConnection = eventSourceInitDict.createConnection
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}
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// If specify http proxy, make the request to sent to the proxy server,
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// and include the original url in path and Host headers
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var useProxy = eventSourceInitDict && eventSourceInitDict.proxy
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if (useProxy) {
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var proxy = parse(eventSourceInitDict.proxy)
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isSecure = proxy.protocol === 'https:'
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options.protocol = isSecure ? 'https:' : 'http:'
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options.path = url
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options.headers.Host = options.host
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options.hostname = proxy.hostname
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options.host = proxy.host
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options.port = proxy.port
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}
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// If https options are specified, merge them into the request options
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if (eventSourceInitDict && eventSourceInitDict.https) {
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for (var optName in eventSourceInitDict.https) {
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if (httpsOptions.indexOf(optName) === -1) {
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continue
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}
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var option = eventSourceInitDict.https[optName]
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if (option !== undefined) {
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options[optName] = option
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}
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}
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}
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// Pass this on to the XHR
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if (eventSourceInitDict && eventSourceInitDict.withCredentials !== undefined) {
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options.withCredentials = eventSourceInitDict.withCredentials
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}
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req = (isSecure ? https : http).request(options, function (res) {
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self.connectionInProgress = false
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// Handle HTTP errors
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if (res.statusCode === 500 || res.statusCode === 502 || res.statusCode === 503 || res.statusCode === 504) {
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_emit('error', new Event('error', {status: res.statusCode, message: res.statusMessage}))
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onConnectionClosed()
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return
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}
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// Handle HTTP redirects
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if (res.statusCode === 301 || res.statusCode === 302 || res.statusCode === 307) {
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if (!res.headers.location) {
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// Server sent redirect response without Location header.
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_emit('error', new Event('error', {status: res.statusCode, message: res.statusMessage}))
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return
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}
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if (res.statusCode === 307) reconnectUrl = url
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url = res.headers.location
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process.nextTick(connect)
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return
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}
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if (res.statusCode !== 200) {
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_emit('error', new Event('error', {status: res.statusCode, message: res.statusMessage}))
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return self.close()
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}
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readyState = EventSource.OPEN
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res.on('close', function () {
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res.removeAllListeners('close')
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res.removeAllListeners('end')
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onConnectionClosed()
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})
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res.on('end', function () {
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res.removeAllListeners('close')
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res.removeAllListeners('end')
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onConnectionClosed()
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})
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_emit('open', new Event('open'))
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// text/event-stream parser adapted from webkit's
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// Source/WebCore/page/EventSource.cpp
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var isFirst = true
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var buf
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var startingPos = 0
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var startingFieldLength = -1
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res.on('data', function (chunk) {
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buf = buf ? Buffer.concat([buf, chunk]) : chunk
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if (isFirst && hasBom(buf)) {
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buf = buf.slice(bom.length)
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}
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isFirst = false
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var pos = 0
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var length = buf.length
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while (pos < length) {
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if (discardTrailingNewline) {
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if (buf[pos] === lineFeed) {
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++pos
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}
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discardTrailingNewline = false
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}
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var lineLength = -1
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var fieldLength = startingFieldLength
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var c
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for (var i = startingPos; lineLength < 0 && i < length; ++i) {
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c = buf[i]
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if (c === colon) {
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if (fieldLength < 0) {
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fieldLength = i - pos
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}
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} else if (c === carriageReturn) {
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discardTrailingNewline = true
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lineLength = i - pos
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} else if (c === lineFeed) {
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lineLength = i - pos
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}
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}
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if (lineLength < 0) {
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startingPos = length - pos
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startingFieldLength = fieldLength
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break
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} else {
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startingPos = 0
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startingFieldLength = -1
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}
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parseEventStreamLine(buf, pos, fieldLength, lineLength)
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pos += lineLength + 1
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}
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if (pos === length) {
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buf = void 0
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} else if (pos > 0) {
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buf = buf.slice(pos)
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}
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})
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})
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req.on('error', function (err) {
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self.connectionInProgress = false
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onConnectionClosed(err.message)
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})
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if (req.setNoDelay) req.setNoDelay(true)
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req.end()
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}
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connect()
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function _emit () {
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if (self.listeners(arguments[0]).length > 0) {
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self.emit.apply(self, arguments)
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}
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}
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this._close = function () {
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if (readyState === EventSource.CLOSED) return
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readyState = EventSource.CLOSED
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if (req.abort) req.abort()
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if (req.xhr && req.xhr.abort) req.xhr.abort()
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}
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function parseEventStreamLine (buf, pos, fieldLength, lineLength) {
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if (lineLength === 0) {
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if (data.length > 0) {
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var type = eventName || 'message'
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_emit(type, new MessageEvent(type, {
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data: data.slice(0, -1), // remove trailing newline
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lastEventId: lastEventId,
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origin: original(url)
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}))
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data = ''
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}
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eventName = void 0
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} else if (fieldLength > 0) {
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var noValue = fieldLength < 0
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var step = 0
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var field = buf.slice(pos, pos + (noValue ? lineLength : fieldLength)).toString()
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if (noValue) {
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step = lineLength
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} else if (buf[pos + fieldLength + 1] !== space) {
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step = fieldLength + 1
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} else {
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step = fieldLength + 2
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}
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pos += step
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var valueLength = lineLength - step
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var value = buf.slice(pos, pos + valueLength).toString()
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if (field === 'data') {
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data += value + '\n'
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} else if (field === 'event') {
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eventName = value
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} else if (field === 'id') {
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lastEventId = value
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} else if (field === 'retry') {
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var retry = parseInt(value, 10)
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if (!Number.isNaN(retry)) {
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self.reconnectInterval = retry
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}
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}
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}
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}
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}
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module.exports = EventSource
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util.inherits(EventSource, events.EventEmitter)
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EventSource.prototype.constructor = EventSource; // make stacktraces readable
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['open', 'error', 'message'].forEach(function (method) {
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Object.defineProperty(EventSource.prototype, 'on' + method, {
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/**
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* Returns the current listener
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*
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* @return {Mixed} the set function or undefined
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* @api private
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*/
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get: function get () {
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var listener = this.listeners(method)[0]
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return listener ? (listener._listener ? listener._listener : listener) : undefined
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},
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/**
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* Start listening for events
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*
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* @param {Function} listener the listener
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* @return {Mixed} the set function or undefined
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* @api private
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*/
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set: function set (listener) {
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this.removeAllListeners(method)
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this.addEventListener(method, listener)
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}
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})
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})
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/**
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* Ready states
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*/
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Object.defineProperty(EventSource, 'CONNECTING', {enumerable: true, value: 0})
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Object.defineProperty(EventSource, 'OPEN', {enumerable: true, value: 1})
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Object.defineProperty(EventSource, 'CLOSED', {enumerable: true, value: 2})
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EventSource.prototype.CONNECTING = 0
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EventSource.prototype.OPEN = 1
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EventSource.prototype.CLOSED = 2
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/**
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* Closes the connection, if one is made, and sets the readyState attribute to 2 (closed)
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*
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* @see https://developer.mozilla.org/en-US/docs/Web/API/EventSource/close
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* @api public
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*/
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EventSource.prototype.close = function () {
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this._close()
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}
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/**
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* Emulates the W3C Browser based WebSocket interface using addEventListener.
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*
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* @param {String} type A string representing the event type to listen out for
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* @param {Function} listener callback
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* @see https://developer.mozilla.org/en/DOM/element.addEventListener
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* @see http://dev.w3.org/html5/websockets/#the-websocket-interface
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* @api public
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*/
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EventSource.prototype.addEventListener = function addEventListener (type, listener) {
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if (typeof listener === 'function') {
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// store a reference so we can return the original function again
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listener._listener = listener
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this.on(type, listener)
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}
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}
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/**
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* Emulates the W3C Browser based WebSocket interface using dispatchEvent.
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*
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* @param {Event} event An event to be dispatched
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* @see https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/dispatchEvent
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* @api public
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*/
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EventSource.prototype.dispatchEvent = function dispatchEvent (event) {
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if (!event.type) {
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throw new Error('UNSPECIFIED_EVENT_TYPE_ERR')
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}
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// if event is instance of an CustomEvent (or has 'details' property),
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// send the detail object as the payload for the event
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this.emit(event.type, event.detail)
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}
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/**
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* Emulates the W3C Browser based WebSocket interface using removeEventListener.
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*
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* @param {String} type A string representing the event type to remove
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* @param {Function} listener callback
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* @see https://developer.mozilla.org/en/DOM/element.removeEventListener
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* @see http://dev.w3.org/html5/websockets/#the-websocket-interface
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* @api public
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*/
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EventSource.prototype.removeEventListener = function removeEventListener (type, listener) {
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if (typeof listener === 'function') {
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listener._listener = undefined
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this.removeListener(type, listener)
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}
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}
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/**
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* W3C Event
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*
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* @see http://www.w3.org/TR/DOM-Level-3-Events/#interface-Event
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* @api private
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*/
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function Event (type, optionalProperties) {
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Object.defineProperty(this, 'type', { writable: false, value: type, enumerable: true })
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if (optionalProperties) {
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for (var f in optionalProperties) {
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if (optionalProperties.hasOwnProperty(f)) {
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Object.defineProperty(this, f, { writable: false, value: optionalProperties[f], enumerable: true })
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}
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}
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}
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}
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/**
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* W3C MessageEvent
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*
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* @see http://www.w3.org/TR/webmessaging/#event-definitions
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* @api private
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*/
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function MessageEvent (type, eventInitDict) {
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Object.defineProperty(this, 'type', { writable: false, value: type, enumerable: true })
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for (var f in eventInitDict) {
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if (eventInitDict.hasOwnProperty(f)) {
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Object.defineProperty(this, f, { writable: false, value: eventInitDict[f], enumerable: true })
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}
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}
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}
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