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import { Config } from "@fosscord/util";
import "missing-native-js-functions";
const reNUMBER = /[0-9]/g;
const reUPPERCASELETTER = /[A-Z]/g;
const reSYMBOLS = /[A-Z,a-z,0-9]/g;
const blocklist: string[] = []; // TODO: update ones passwordblocklist is stored in db
/*
* https://en.wikipedia.org/wiki/Password_policy
* password must meet following criteria, to be perfect:
* - min <n> chars
* - min <n> numbers
* - min <n> symbols
* - min <n> uppercase chars
* - shannon entropy folded into [0, 1) interval
*
* Returns: 0 > pw > 1
*/
export function checkPassword(password: string): number {
const { minLength, minNumbers, minUpperCase, minSymbols } = Config.get().register.password;
var strength = 0;
// checks for total password len
if (password.length >= minLength - 1) {
strength += 0.05;
}
// checks for amount of Numbers
if (password.count(reNUMBER) >= minNumbers - 1) {
strength += 0.05;
}
// checks for amount of Uppercase Letters
if (password.count(reUPPERCASELETTER) >= minUpperCase - 1) {
strength += 0.05;
}
// checks for amount of symbols
if (password.replace(reSYMBOLS, "").length >= minSymbols - 1) {
strength += 0.05;
}
// checks if password only consists of numbers or only consists of chars
if (password.length == password.count(reNUMBER) || password.length === password.count(reUPPERCASELETTER)) {
strength = 0;
}
let entropyMap: { [key: string]: number } = {};
for (let i = 0; i < password.length; i++) {
if (entropyMap[password[i]]) entropyMap[password[i]]++;
else entropyMap[password[i]] = 1;
}
let entropies = Object.values(entropyMap);
entropies.map(x => (x / entropyMap.length));
strength += entropies.reduceRight((a: number, x: number) => a - (x * Math.log2(x))) / Math.log2(password.length);
return strength;
}
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