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Editing: README.md

# proxy-addr

[![NPM Version][npm-version-image]][npm-url]
[![NPM Downloads][npm-downloads-image]][npm-url]
[![Node.js Version][node-image]][node-url]
[![Build Status][ci-image]][ci-url]
[![Test Coverage][coveralls-image]][coveralls-url]

Determine address of proxied request

## Install

This is a [Node.js](https://nodejs.org/en/) module available through the
[npm registry](https://www.npmjs.com/). Installation is done using the
[`npm install` command](https://docs.npmjs.com/getting-started/installing-npm-packages-locally):

```sh
$ npm install proxy-addr
```

## API

```js
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.

```js
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.

```js
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`).

```js
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:

```js
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`).

```js
proxyaddr.all(req)
```

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

```js
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)`.

```js
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.

## Testing

```sh
$ npm test
```

## Benchmarks

```sh
$ npm run-script bench
```

## License

[MIT](LICENSE)

[ci-image]: https://badgen.net/github/checks/jshttp/proxy-addr/master?label=ci
[ci-url]: https://github.com/jshttp/proxy-addr/actions?query=workflow%3Aci
[coveralls-image]: https://badgen.net/coveralls/c/github/jshttp/proxy-addr/master
[coveralls-url]: https://coveralls.io/r/jshttp/proxy-addr?branch=master
[node-image]: https://badgen.net/npm/node/proxy-addr
[node-url]: https://nodejs.org/en/download
[npm-downloads-image]: https://badgen.net/npm/dm/proxy-addr
[npm-url]: https://npmjs.org/package/proxy-addr
[npm-version-image]: https://badgen.net/npm/v/proxy-addr

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