All files eventsource.js

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79.13% Branches 91/115
90% Functions 18/20
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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
    Iif (eventSourceInitDict && eventSourceInitDict.proxy) {
      var proxy = parse(eventSourceInitDict.proxy)
      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 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
 
/**
 * 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 })
    }
  }
}