koa-ip-geo

IP and GeoLocation filter middleware for koa, support allow lists and block lists.

News and Changes

Major (breaking) Changes - Version 2

• This new version 2.x.x is adapted for Koa2
• as it uses the async/await pattern this new version works only with node.js v7.6.0 and above.

Quick Start

Installation

$ npm install koa-ip-geo --save

You also need the Maxmind GeoLite2 Free Database (city or country). We recommend the 'country' version, because it is smaller. Check their website to get the database.

Alternatively you can now also use ip2location Databases (city or country). We recommend the 'country' version, because it is smaller. Check their website to get the database.

Basic Usage

This example has a allow for local IP addresses and a allow for Austrian IP addresses:

const Koa = require('koa');
const ipGeo = require('koa-ip-geo');

const app = new Koa();

// if you are using maxminds geo ip database
app.use(ipGeo({
  geoDB: 'path/to/geodb.mmdb',
  getDBtype: 'maxmind',
  allowIP: '192.168.0.*',
  allowCountry: ['AT']
}));

app.use(...);
app.listen(3000);

If you waht to use the ip2location database instead, please change the config to:

// using ip2location database
app.use(ipGeo({
  geoDB: 'path/to/ip2location.bin',
  getDBtype: 'ip2location',
  allowIP: '192.168.0.*',
  allowCountry: ['AT']
}));

app.use(...);
app.listen(3000);

Advanced Options

Allow IP address

Very basic IP filtering:

app.use(ipGeo('192.168.0.*'));

Filtering more than one IP address range:

app.use(ipGeo('192.168.0.* 8.8.8.[0-3]'));

or

app.use(ipGeo(['192.168.0.*', '8.8.8.[0-3]']));

Notes: In the previous examples you saw just a single string or an array as a parameter passed to the middleware. For simplicity, in this case this will be interpreted as a 'allowIP'-parameter. Explicitly specifying a 'allowIP'-parameter would be the 'correct' and more readable way:

app.use(ipGeo({
  allowIP: ['192.168.0.*', '8.8.8.*']
}));

Block IP adresses example

app.use(ipGeo({
  blockIP: ['8.8.8.*', '1.80.*'],
}));

Allow countries

In order to determine country origin, we need also to specify the geoDB database:

app.use(ipGeo({
  geoDB: 'path/to/geodb.mmdb',
  allowCountry: ['US', 'UK', 'DE', 'AT']
}));

Notes: The geoDB database will only be loaded if necessary. So if you specify a database but do not filter by country or continent, the database will not be loaded.

Block countries

app.use(ipGeo({
  geoDB: 'path/to/geodb.mmdb',
  blockCountry: ['CN', 'RU']
}));

Allow continents

app.use(ipGeo({
  geoDB: 'path/to/geodb.mmdb',
  allowContinent: ['NA', 'EU']
}));

Block continents

app.use(ipGeo({
  geoDB: 'path/to/geodb.mmdb',
  blockContinent: ['AS']
}));

Pass Geo-IP data into context ...

If you need Geo-IP data later in your koa context (ctx. ...), just set the 'context' option to true.

app.use(ipGeo({
  geoDB: 'path/to/geodb.mmdb',
  allowCountry: ['US', 'UK', 'DE', 'AT'],
  context: true
}));

// you can and then later access geo-ip data in the context of your request:

...
  let city = ctx.geoCity;                    // city name
  let country = ctx.geoCountry;              // country name
  let continent = ctx.geoContinent;          // continent name
  let countrycode = ctx.geoCountryCode       // country code (ISO_3166-2)
  let continentCode = ctx.geoContinentCode;  // continent code
  let latitude = ctx.geoLatitude;            // latitude
  let longitude = ctx.geoLongitude;          // longitude
...

More complex example:

app.use(ipGeo({
  blockIP: ['8.8.8.*'],
  geoDB: 'path/to/geodb.mmdb',
  allowCountry: ['UK', 'US', 'FR', 'DE', 'AT'],
  forbidden: '403 - Custom Forbidden Message',
  development: (process.env.NODE_ENV === 'Development')
}));

Custom messages

Example with custom forbidden (= rejection) message (function):

forbidden = async function (ctx, next) {
  ctx.set('X-Seriously', 'yes');
  return 'Seriously - No Access';
}

app.use(ipGeo({
  allowIP: '192.168.0.*',
  forbidden: forbidden
}))

GeoLite2 Database

This middleware works with Maxmind GeoLite2 Free Database (city or country). We recommend the 'country' version, because it is smaller. Check their website to get the database. Alternatively you now can also use ip2location Lite Databases (city or country). We recommend the 'country' version, because it is smaller. Check their website to get the database.

koa-ip-geo loads the entire database file into memory as a single node Buffer. It also uses an in-memory cache when reading complex data structures out of this buffer in the interests of performance. So very roughly speaking, you should assume this module will consume size_of_mmdb_file * 1.25 of memory.

Option Reference

option	Description	Example
geoDB	path to maxmind or ip2location database	'GeoLite2-City.mmdb'
geoDBtype	'maxmind' or 'ip2location' - defaults to maxmind	'maxmind'
allowIP	Array of IP addresses (or space separated string)	['192.168.0.*', '8.8.8.[0-3]']
blockIP	Array of IP addresses (or space separated string)	['8.8.8.', '1.80.']
allowCountry	Array of ISO 3166-2 country code (or space separated string)	['US', 'AT']
blockCountry	Array of ISO 3166-2 country code (or space separated string)	['CN', 'RU']
allowContinent	Array of continent code (or space separated string)	['EU', 'NA']
blockContinent	Array of continent code (or space separated string)	['AS', 'OC', 'AF']
forbidden	custom 'forbidden' message (string or function)	'403 - Forbidden'
context	set true, if you need geoIP information in the context	defaults to false
development	if true, no filztering is done	defaults to false

Formats

IP Addresses

Possible Formats:

• x.x.x.x for a specific IP address
• x.x.x.* for a IP range
• x.x.. for a IP range
• x.x.* for a IP range also works perfectly
• x.x.x.[0-127] this is also a range of IP addresses.

Notice: CIDR notation (e.g. x.x.x.x/18) is not supported at the moment.

Country Codes

Please use the ISO 3166-2 country code like 'US', 'UK', ....

Continent Codes

• AF - Africa
• AS - Asia
• EU - Europe
• NA - North America
• OC - Oceania
• SA - South America

Version history

Version	Date	Comment
2.3.1	2020-10-04	bugfix ip handling
2.3.0	2020-10-04	now also support for ip2location databases
2.2.0	2020-06-17	interface adaption allow/block (preserving backwards compatibility)
2.1.2	2019-02-23	typescript definitions adapted
2.1.1	2019-02-22	typescript definitions modification
2.1.0	2019-02-22	added typescript definitions
2.0.4	2018-11-03	improved code quality
2.0.3	2018-11-03	dependencies update, updated docs
2.0.2	2017-12-23	removed console.log
2.0.1	2017-11-20	fixed typos README.md
2.0.0	2017-11-20	made for Koa2, version bump, updated dependencies
1.2.1	2015-09-25	udated README, more examples, typos, ...
1.2.0	2015-09-23	now also space separated string possible
1.1.2	2015-09-19	updated DOCs - whiteListIP, examples, typos
1.1.0	2015-09-19	added geoIP data to koa context (as an option)
1.0.0	2015-09-18	initial release

Changes Version 2.0.0

This new version is now for Koa2! So this means, this version is a breaking change! Be sure to also use node.js v7.6.0 or above.

Changes Version 1.2.0

• you can now pass arrays as well as space separated strings to each allow/block:

app.use(ipGeo({
  blockIP: ['192.168.0.*', '8.8.8.*']
}));

is now the same as

app.use(ipGeo({
  blockIP: '192.168.0.* 8.8.8.*'
}));

• added synonym for localhost = IPv4 127.0.0.1 = IPv6 ::1 - all three will be handled the same way, you only have to provide ONE of those addresses. E.g.:

app.use(ipGeo({
  allowIP: 'localhost'
}));

will allow 127.0.0.1 and ::1 and vice versa.

Comments

If you have ideas or comments, please do not hesitate to contact me. Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.

Sincerely,

Sebastian Hildebrandt, +innovations

Credits

Written by Sebastian Hildebrandt sebhildebrandt

This package is heavenly inspired by koa-ip and koa-ip-filter. Check them out also.

License

The MIT License (MIT)

Copyright © 2018-2020 Sebastian Hildebrandt, +innovations.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.