Install

npm install proxy-addr

yarn add proxy-addr

proxy-addr

Determine address of proxied request

Install

This is a Node.js module available through the
npm registry. Installation is done using the
npm install command:

 $ npm install proxy-addr

API

 var proxyaddr = require('proxy-addr')

proxyaddr(req, trust)

Return the address of the request, using the given trust parameter.

The trust argument is a function that returns true if you trust
the address, false if you don't. The closest untrusted address is
returned.

 proxyaddr(req, function (addr) { return addr === '127.0.0.1' })
proxyaddr(req, function (addr, i) { return i < 1 })

The trust arugment may also be a single IP address string or an
array of trusted addresses, as plain IP addresses, CIDR-formatted
strings, or IP/netmask strings.

 proxyaddr(req, '127.0.0.1')
proxyaddr(req, ['127.0.0.0/8', '10.0.0.0/8'])
proxyaddr(req, ['127.0.0.0/255.0.0.0', '192.168.0.0/255.255.0.0'])

This module also supports IPv6. Your IPv6 addresses will be normalized
automatically (i.e. fe80::00ed:1 equals fe80:0:0:0:0:0:ed:1).

 proxyaddr(req, '::1')
proxyaddr(req, ['::1/128', 'fe80::/10'])

This module will automatically work with IPv4-mapped IPv6 addresses
as well to support node.js in IPv6-only mode. This means that you do
not have to specify both ::ffff:a00:1 and 10.0.0.1.

As a convenience, this module also takes certain pre-defined names
in addition to IP addresses, which expand into IP addresses:

 proxyaddr(req, 'loopback')
proxyaddr(req, ['loopback', 'fc00:ac:1ab5:fff::1/64'])

loopback: IPv4 and IPv6 loopback addresses (like ::1 and
127.0.0.1).
linklocal: IPv4 and IPv6 link-local addresses (like
fe80::1:1:1:1 and 169.254.0.1).
uniquelocal: IPv4 private addresses and IPv6 unique-local
addresses (like fc00:ac:1ab5:fff::1 and 192.168.0.1).

When trust is specified as a function, it will be called for each
address to determine if it is a trusted address. The function is
given two arguments: addr and i, where addr is a string of
the address to check and i is a number that represents the distance
from the socket address.

proxyaddr.all(req, [trust])

Return all the addresses of the request, optionally stopping at the
first untrusted. This array is ordered from closest to furthest
(i.e. arr[0] === req.connection.remoteAddress).

 proxyaddr.all(req)

The optional trust argument takes the same arguments as trust
does in proxyaddr(req, trust).

 proxyaddr.all(req, 'loopback')

proxyaddr.compile(val)

Compiles argument val into a trust function. This function takes
the same arguments as trust does in proxyaddr(req, trust) and
returns a function suitable for proxyaddr(req, trust).

 var trust = proxyaddr.compile('loopback')
var addr = proxyaddr(req, trust)

This function is meant to be optimized for use against every request.
It is recommend to compile a trust function up-front for the trusted
configuration and pass that to proxyaddr(req, trust) for each request.