fanger

fanger is an npm package for defang and refang IoC.

What are defang and refang

Defang means to change a part of IoC to make inaccessible or unclickable. (e.g. example.com => example[.]com)

Refang means to revert a defanged IoC to the original one. (e.g. example[.]com => example.com)

Installation

npm install fanger -g

Usage

As a CLI

$ echo "example.com" | defang
example[.]com

$ echo "test@example.com" | defang
test@example[.]com

$ echo "https://example.com" | defang
hxxps://example[.]com

$ echo "example[.]com" | refang
example.com

$ echo "test@example[.]com" | refang
test@example.com

$ echo "hxxps://example[.]com" | refang
https://example.com

As a library

import { defang, refang } from "fanger";

const text = "example.com";
console.log(defang(text));
// example[.]com

const defangedText = "example[.]com";
console.log(refang(defangedText));
// example.com

Supported defang/refang techniques

Defang

The following defang techniques are supported.

IPv4

• 1.1.1.1 => 1[.]1.1.1

The first dot of an IPv4 will be replaced with [.].

Domain

• example.com => example[.]com
• test.com.example.com => test[.]com.example[.]com

A dot before a label which is registered as a TLD will be replaced with [.].

HTTP scheme

• http => hxxp
• https => hxxps

Supported refang techniques

The following refang techniques are supported.

Techniques	Defanged	Refanged
Remove spaces	1.1.1 . 1	1.1.1.1
[.] => .	1.1.1[.]1	1.1.1.1
(.) => .	1.1.1(.)1	1.1.1.1
{.} => .	1.1.1{.}1	1.1.1.1
\. => .	example\.com	example.com
[/] => /	http://example.com[/]path	http://example.com/path
[:] => :	http[:]//example.com	http://example.com
hxxp => http	hxxps://google.com	https://google.com
[at] => @	test[at]example.com	test@example.com
[@] => @	test[@]example.com	test@example.com
(@) => @	test(@)example.com	test@example.com
[dot] => .	test@example[dot]com	test@example.com
(dot) => .	test@example(dot)com	test@example.com
{dot} => .	test@example{dot}com	test@example.com
Partial	1.1.1[.1	1.1.1.1
Any combination	hxxps[:]//test\.example[.)com[/]path	https://test.example.com/path