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index.js
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index.js
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/*
defangjs v1.0.7
@Repository: https://github.com/edoardottt/defangjs
@Author: edoardottt, https://www.edoardoottavianelli.it
@License: https://github.com/edoardottt/defangjs/blob/main/LICENSE
*/
//Regular expression (global) matching a dot.
const reDot = /\./g;
//Regular expression (global) matching a colon.
//This is useful for the port.
const reColon = /\:/g;
//Regular expression (global) matching a defanged double colon.
//This is useful for Ipv6.
const reDoubleColon = /\:\:/g;
/*
* Defang a url.
* For security reasons, if the url is not formatted in
* a proper way the result is an empty string.
* @param {string} input: The url you want to defang.
* @return {string} The input url defanged.
*/
exports.Url = function (input) {
var result = "";
// - http:// --> hxxp[://]
if (input.substring(0, 7) == "http://") {
result = helperHttp(input);
}
// - https:// --> hxxps[://]
if (input.substring(0, 8) == "https://") {
result = helperHttps(input);
}
// - ftp:// --> fxp[://]
if (input.substring(0, 6) == "ftp://") {
result = helperFtp(input);
}
// no protocol
if (result == "") {
result = helperNoProtocol(input);
}
// then check if result is different from "" !
return result;
}
/*
* Defang a HTTP url (internal).
* @param {string} input: The HTTP url you want to defang.
* @return {string} The input HTTP url defanged.
*/
function helperHttp(input) {
var result = "hxxp[://]";
var endDomain = input.indexOf('/', 7);
if (endDomain != -1) {
result += input.substring(7, endDomain).replace(reDot, '[.]').replace(reColon, '[:]');
result += input.substring(endDomain);
} else {
result += input.substring(7).replace(reDot, '[.]').replace(reColon, '[:]');
}
return result;
}
/*
* Defang a HTTPS url (internal).
* @param {string} input: The HTTPS url you want to defang.
* @return {string} The input HTTPS url defanged.
*/
function helperHttps(input) {
var result = "hxxps[://]"
var endDomain = input.indexOf('/', 8)
if (endDomain != -1) {
result += input.substring(8, endDomain).replace(reDot, '[.]').replace(reColon, '[:]');
result += input.substring(endDomain)
} else {
result += input.substring(8).replace(reDot, '[.]').replace(reColon, '[:]');
}
return result
}
/*
* Defang a FTP url (internal).
* @param {string} input: The FTP url you want to defang.
* @return {string} The input FTP url defanged.
*/
function helperFtp(input) {
var result = "fxp[://]";
var endDomain = input.indexOf('/', 6);
if (endDomain != -1) {
result += input.substring(6, endDomain).replace(reDot, '[.]').replace(reColon, '[:]');
result += input.substring(endDomain);
} else {
result += input.substring(6).replace(reDot, '[.]').replace(reColon, '[:]');
}
return result;
}
/*
* Defang a url without protocol (internal).
* @param {string} input: The url you want to defang.
* @return {string} The input url defanged.
*/
function helperNoProtocol(input) {
var result = "";
if (input.substring(0, 3) == "://") {
result += "[://]";
var endDomain = input.indexOf('/', 3);
if (endDomain != -1) {
result += input.substring(3, endDomain).replace(reDot, '[.]').replace(reColon, '[:]');
result += input.substring(endDomain);
} else {
result += input.substring(3).replace(reDot, '[.]').replace(reColon, '[:]');
}
} else if (input.substring(0, 2) == "//") {
result += "[//]";
var endDomain = input.indexOf('/', 2);
if (endDomain != -1) {
result += input.substring(2, endDomain).replace(reDot, '[.]').replace(reColon, '[:]');
result += input.substring(endDomain);
} else {
result += input.substring(2).replace(reDot, '[.]').replace(reColon, '[:]');
}
} else {
var endDomain = input.indexOf('/', 0);
if (endDomain != -1) {
result += input.substring(0, endDomain).replace(reDot, '[.]').replace(reColon, '[:]');
result += input.substring(endDomain);
} else {
result += input.replace(reDot, '[.]').replace(reColon, '[:]');
}
}
return result;
}
/*
* Defang an Ip address.
* Support both IPv4 and IPv6.
* @param {string} input: The ip you want to defang.
* @return {string} The input ip defanged.
*/
exports.Ip = function (input) {
var result = "";
var doubleColonIndex = input.indexOf("::", 0);
if (doubleColonIndex != -1) {
// SHORT IPV6
result += input.substring(0, doubleColonIndex).replace(reColon, '[:]');
result += "[::]"
result += input.substring(doubleColonIndex + 2).replace(reColon, '[:]');
} else {
result += input.replace(reDot, '[.]').replace(reColon, '[:]');
}
return result;
}
/*
* Defang an email address.
* @param {string} input: The email you want to defang.
* @return {string} The input email defanged.
*/
exports.Email = function (input) {
return input.replace(reDot, '[.]').replace(reColon, '[:]');
}