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Use safe random generation

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Bart Coppens 2026-06-05 20:28:58 +02:00
parent 3e537a7e2f
commit 1bfb217feb
1 changed files with 8 additions and 11 deletions
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19
src/tools/national-id-generator/strategies/be.ts
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@ -1,4 +1,5 @@
import type { Gender, GenerateOptions, GeneratedId, IdNumberStrategy } from '../national-id-generator.types';
import { randIntFromInterval } from '@/utils/random';
// ─── types re-exported for backwards compatibility ────────────────────────────
@ -21,10 +22,6 @@ export interface BelgianSSIN extends GeneratedId {
// ─── internal helpers ─────────────────────────────────────────────────────────
function randomInt(min: number, max: number): number {
return Math.floor(Math.random() * (max - min + 1)) + min;
}
function daysInMonth(year: number, month: number): number {
// month is 1-indexed (1–12); new Date(year, month, 0) gives the last day of that month
return new Date(year, month, 0).getDate();
@ -41,7 +38,7 @@ function randomLeapYear(min: number, max: number): number {
leapYears.push(y);
}
}
return leapYears[Math.floor(Math.random() * leapYears.length)]!;
return leapYears[randIntFromInterval(0, 0.999) * leapYears.length]!;
}
function computeChecksum(yymmdd: string, serial: string, bornAfter2000: boolean): string {
@ -54,14 +51,14 @@ function computeChecksum(yymmdd: string, serial: string, bornAfter2000: boolean)
// ─── public API ───────────────────────────────────────────────────────────────
export function generateBelgianSSIN(opts: GenerateBelgianSSINOptions = {}): BelgianSSIN {
const gender: Gender = opts.gender ?? (Math.random() < 0.5 ? 'male' : 'female');
const gender: Gender = opts.gender ?? (randIntFromInterval(0, 0.9) < 0.5 ? 'male' : 'female');
const fictitious = opts.fictitious ?? false;
const currentYear = new Date().getFullYear();
const needsLeapYear = opts.birthDay === 29 && opts.birthMonth === 2 && opts.birthYear === undefined;
const fullYear = opts.birthYear ?? (needsLeapYear ? randomLeapYear(1900, currentYear) : randomInt(1900, currentYear));
const month = opts.birthMonth ?? randomInt(1, 12);
const day = opts.birthDay ?? randomInt(1, daysInMonth(fullYear, month));
const fullYear = opts.birthYear ?? (needsLeapYear ? randomLeapYear(1900, currentYear) : randIntFromInterval(1900, currentYear));
const month = opts.birthMonth ?? randIntFromInterval(1, 12);
const day = opts.birthDay ?? randIntFromInterval(1, daysInMonth(fullYear, month));
const birthDate = new Date(fullYear, month - 1, day);
const yy = fullYear.toString().slice(-2).padStart(2, '0');
@ -74,14 +71,14 @@ export function generateBelgianSSIN(opts: GenerateBelgianSSINOptions = {}): Belg
if (gender === 'male') {
const minOdd = fictitious ? 901 : 1;
const maxOdd = fictitious ? 999 : 899;
const oddNum = randomInt(minOdd, maxOdd);
const oddNum = randIntFromInterval(minOdd, maxOdd);
const oddValue = oddNum % 2 === 0 ? oddNum + 1 : oddNum;
serial = oddValue.toString().padStart(3, '0');
}
else {
const minEven = fictitious ? 900 : 2;
const maxEven = fictitious ? 998 : 898;
const evenNum = randomInt(minEven / 2, maxEven / 2);
const evenNum = randIntFromInterval(minEven / 2, maxEven / 2);
serial = (evenNum * 2).toString().padStart(3, '0');
}