1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
|
'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
|
