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'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-length',
'content-location',
'content-md5',
'content-range',
'content-type',
'connection',
'date',
'expect',
'max-forwards',
'pragma',
'referer',
'te',
'transfer-encoding',
'user-agent',
'via'
]
var defaultProxyHeaderExclusiveList = [
'proxy-authorization'
]
function constructProxyHost(uriObject) {
var port = uriObject.portA
, 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 = []
}
Tunnel.prototype.isEnabled = function (options) {
var request = this.request
// Tunnel HTTPS by default, or if a previous request in the redirect chain
// was tunneled. Allow the user to override this setting.
// If self.tunnel is already set (because this is a redirect), use the
// existing value.
if (typeof request.tunnel !== 'undefined') {
return request.tunnel
}
// If options.tunnel is set (the user specified a value), use it.
if (typeof options.tunnel !== 'undefined') {
return options.tunnel
}
// If the destination is HTTPS, tunnel.
if (request.uri.protocol === 'https:') {
return true
}
// Otherwise, leave tunnel unset, because if a later request in the redirect
// chain is HTTPS then that request (and any subsequent ones) should be
// tunneled.
return undefined
}
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
|
