express-ipfilter-req v1.2.0

express-ipfilter: A light-weight IP address based filtering system

This package provides easy IP based access control. This can be achieved either by blacklisting certain IPs and whitelisting all others, or whitelisting certain IPs and blacklisting all others.

Installation

Recommended installation is with npm. To add express-ipfilter to your project, do:

npm install varmil/express-ipfilter

Usage with Express

Blacklisting certain IP addresses, while allowing all other IPs:

// Init dependencies
const express = require('express')
const ipfilter = require('express-ipfilter').IpFilter

// Blacklist the following IPs
const ips = ['127.0.0.1']

// Create the server
app.use(ipfilter(ips))
app.listen(3000)

Whitelisting certain IP addresses, while denying all other IPs:

// Init dependencies
// Init dependencies
const express = require('express')
const ipfilter = require('express-ipfilter').IpFilter

// Whitelist the following IPs
const ips = ['127.0.0.1']

// Create the server
app.use(ipfilter(ips, { mode: 'allow' }))

module.exports = app

Using CIDR subnet masks for ranges:

const ips = ['127.0.0.1/24']

// Create the server
app.use(ipfilter(ips, { mode: 'allow' }))

module.exports = app

Using IP ranges:

const ips = [['127.0.0.1', '127.0.0.10']]

// Create the server
app.use(ipfilter(ips, { mode: 'allow' }))

module.exports = app

Using a function to get Ips:

const ips = function(req) {
  return ['127.0.0.1']
}

// Create the server
app.use(ipfilter(ips, { mode: 'allow' }))

module.exports = app

Error Handling

When an IP is denied, an IpDeniedError will be thrown by the middleware. If you do not handle the error, it will cause your app to crash due to an unhandled exception. Here is an example of how to handle the error, which can also be found in the example app:

if (app.get('env') === 'development') {
  app.use((err, req, res, _next) => {
    console.log('Error handler', err)
    if (err instanceof IpDeniedError) {
      res.status(401)
    } else {
      res.status(err.status || 500)
    }

    res.render('error', {
      message: 'You shall not pass',
      error: err
    })
  })
}

You will need to require the IpDeniedError type in order to handle it.

Options

A note on detectIp

If you need to parse an IP address in a way that is not supported by default, you can write your own parser and pass that to ipfilter.

const customDetection = req => {
  var ipAddress

  ipAddress = req.connection.remoteAddress.replace(/\//g, '.')

  return ipAddress
}

ipfilter(ids, { detectIp: customDetection })

Contributing

See the CONTRIBUTING.MD document for more information on contributing.

Running Tests

Run tests by using npm test

Changelog

Moved to GitHub Releases

Credits

BaM Interactive - code.bamideas.com