dynatrace-cordova-outsystems-plugin/node_modules/request/lib/tunnel.js

This plugin gives you the ability to use the Dynatrace instrumentation in your hybrid application (Cordova, Ionic, ..). It uses the Mobile Agent, the JavaScript Agent and the Javascript Bridge. The Mobile Agent will give you all device specific values con

'use strict'

var url = require('url')
  , tunnel = require('tunnel-agent')

var defaultProxyHeaderWhiteList = [
  'accept',
  'accept-charset',
  'accept-encoding',
  'accept-language',
  'accept-ranges',
  'cache-control',
  'content-encoding',
  'content-language',
  'content-location',
  'content-md5',
  'content-range',
  'content-type',
  'connection',
  'date',
  'expect',
  'max-forwards',
  'pragma',
  'referer',
  'te',
  'user-agent',
  'via'
]

var defaultProxyHeaderExclusiveList = [
  'proxy-authorization'
]

function constructProxyHost(uriObject) {
  var port = uriObject.port
    , protocol = uriObject.protocol
    , proxyHost = uriObject.hostname + ':'

  if (port) {
    proxyHost += port
  } else if (protocol === 'https:') {
    proxyHost += '443'
  } else {
    proxyHost += '80'
  }

  return proxyHost
}

function constructProxyHeaderWhiteList(headers, proxyHeaderWhiteList) {
  var whiteList = proxyHeaderWhiteList
    .reduce(function (set, header) {
      set[header.toLowerCase()] = true
      return set
    }, {})

  return Object.keys(headers)
    .filter(function (header) {
      return whiteList[header.toLowerCase()]
    })
    .reduce(function (set, header) {
      set[header] = headers[header]
      return set
    }, {})
}

function constructTunnelOptions (request, proxyHeaders) {
  var proxy = request.proxy

  var tunnelOptions = {
    proxy : {
      host      : proxy.hostname,
      port      : +proxy.port,
      proxyAuth : proxy.auth,
      headers   : proxyHeaders
    },
    headers            : request.headers,
    ca                 : request.ca,
    cert               : request.cert,
    key                : request.key,
    passphrase         : request.passphrase,
    pfx                : request.pfx,
    ciphers            : request.ciphers,
    rejectUnauthorized : request.rejectUnauthorized,
    secureOptions      : request.secureOptions,
    secureProtocol     : request.secureProtocol
  }

  return tunnelOptions
}

function constructTunnelFnName(uri, proxy) {
  var uriProtocol = (uri.protocol === 'https:' ? 'https' : 'http')
  var proxyProtocol = (proxy.protocol === 'https:' ? 'Https' : 'Http')
  return [uriProtocol, proxyProtocol].join('Over')
}

function getTunnelFn(request) {
  var uri = request.uri
  var proxy = request.proxy
  var tunnelFnName = constructTunnelFnName(uri, proxy)
  return tunnel[tunnelFnName]
}


function Tunnel (request) {
  this.request = request
  this.proxyHeaderWhiteList = defaultProxyHeaderWhiteList
  this.proxyHeaderExclusiveList = []
  if (typeof request.tunnel !== 'undefined') {
    this.tunnelOverride = request.tunnel
  }
}

Tunnel.prototype.isEnabled = function () {
  var self = this
    , request = self.request
  // Tunnel HTTPS by default. Allow the user to override this setting.

  // If self.tunnelOverride is set (the user specified a value), use it.
  if (typeof self.tunnelOverride !== 'undefined') {
    return self.tunnelOverride
  }

  // If the destination is HTTPS, tunnel.
  if (request.uri.protocol === 'https:') {
    return true
  }

  // Otherwise, do not use tunnel.
  return false
}

Tunnel.prototype.setup = function (options) {
  var self = this
    , request = self.request

  options = options || {}

  if (typeof request.proxy === 'string') {
    request.proxy = url.parse(request.proxy)
  }

  if (!request.proxy || !request.tunnel) {
    return false
  }

  // Setup Proxy Header Exclusive List and White List
  if (options.proxyHeaderWhiteList) {
    self.proxyHeaderWhiteList = options.proxyHeaderWhiteList
  }
  if (options.proxyHeaderExclusiveList) {
    self.proxyHeaderExclusiveList = options.proxyHeaderExclusiveList
  }

  var proxyHeaderExclusiveList = self.proxyHeaderExclusiveList.concat(defaultProxyHeaderExclusiveList)
  var proxyHeaderWhiteList = self.proxyHeaderWhiteList.concat(proxyHeaderExclusiveList)

  // Setup Proxy Headers and Proxy Headers Host
  // Only send the Proxy White Listed Header names
  var proxyHeaders = constructProxyHeaderWhiteList(request.headers, proxyHeaderWhiteList)
  proxyHeaders.host = constructProxyHost(request.uri)

  proxyHeaderExclusiveList.forEach(request.removeHeader, request)

  // Set Agent from Tunnel Data
  var tunnelFn = getTunnelFn(request)
  var tunnelOptions = constructTunnelOptions(request, proxyHeaders)
  request.agent = tunnelFn(tunnelOptions)

  return true
}

Tunnel.defaultProxyHeaderWhiteList = defaultProxyHeaderWhiteList
Tunnel.defaultProxyHeaderExclusiveList = defaultProxyHeaderExclusiveList
exports.Tunnel = Tunnel