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Showing content from https://github.com/tunnckoCore/koa-ip-filter below:

tunnckoCore/koa-ip-filter: koa middleware to filter request IPs or custom ID with glob patterns, array, string, regexp or matcher function. Support custom 403 Forbidden message and custom ID.

Middleware for koa that filters IPs against glob patterns, RegExp, string or array of globs. Support custom 403 Forbidden message and custom ID.

npm i koa-ip-filter --save

• custom message when 403 Forbidden response, through opts.forbidden
• custom identifier different than default this.ip, through opts.id
  • you may want to add opts.strict: false if it's not IP
• filter IP using glob patterns, regexp, string, array or function
• blacklist with negative glob patterns, whitelist with positive
• would restrict all to 403 Forbidden that not match to filter

Notice: In the next middleware you will have this.filter method which is ip-filter and this.identifier - the IP/ID that passed the given filter

For more use-cases see the tests

const koaIpFilter = require('koa-ip-filter')

Filtering incoming request with glob patterns array, regexp, string or matcher function

Params

• options {Object}
  • id {Function}: custom identifier, defaults to this.ip
  • strict {Boolean}: to throw when not valid IPv4/IPv6? default true
  • filter {Array|String|RegExp|Function}: black/white list filter
  • forbidden {String|Function}: custom message when 403 Forbidden response
• returns {GeneratorFunction}

Example

'use strict'

var koa = require('koa')
var ipFilter = require('koa-ip-filter')
var helloWorld = require('koa-hello-world')

var app = koa()

app
.use(ipFilter({
  forbidden: '403: Get out of here!',
  filter: ['127.??.6*.12', '!1.2.*.4']
}))
.use(helloWorld())

app.listen(1234)
console.log('koa server start listening on http://localhost:1234')

// if your IP is `127.43.65.12` you will see `Hello World`
// otherwise you will see `403: Get out of here!`

If you want to allow all IPs, but want to restrict only some range

'use strict'

var koa = require('koa')
var ipFilter = require('koa-ip-filter')
var helloWorld = require('koa-hello-world')

var app = koa()

app
.use(ipFilter({
  forbidden: '403: Get out of here!',
  filter: ['*', '!213.15.*']
}))
.use(helloWorld())

app.listen(1234)
console.log('koa server start listening on http://localhost:1234')

// only user with IP starting with `213.15.*` 
// will see the message `403: Get out of here!`

• ip-filter: Filters valid IPv4 or IPv6 against glob pattern, array, string and etc… more | homepage
• is-match-ip: Matching IPs using micromatch and ip-filter - glob patterns, RegExp, string or… more | homepage
• is-match: Create a matching function from a glob pattern, regex, string, array, object… more | homepage
• koa-better-body: Full-featured koa body parser! Support parsing text, buffer, json, json patch, json… more | homepage
• koa-ip-filter: koa middleware to filter request IPs or custom ID with glob patterns… more | homepage
• micromatch: Glob matching for javascript/node.js. A drop-in replacement and faster alternative to minimatch… more | homepage

Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.
But before doing anything, please read the CONTRIBUTING.md guidelines.

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