misskey/packages/backend/src/misc/id/ulid.ts

/*
 * SPDX-FileCopyrightText: syuilo and other misskey contributors
 * SPDX-License-Identifier: AGPL-3.0-only
 */

// Crockford's Base32
// https://github.com/ulid/spec#encoding
const CHARS = '0123456789ABCDEFGHJKMNPQRSTVWXYZ';

export const ulidRegExp = /^[0123456789ABCDEFGHJKMNPQRSTVWXYZ]{26}$/;

export function parseUlid(id: string): { date: Date; } {
	const timestamp = id.slice(0, 10);
	let time = 0;
	for (let i = 0; i < 10; i++) {
		time = time * 32 + CHARS.indexOf(timestamp[i]);
	}
	return { date: new Date(time) };
}