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/*
* SPDX-FileCopyrightText: syuilo and misskey-project
* SPDX-License-Identifier: AGPL-3.0-only
*/
// AIDX
// 長さ8の[2000年1月1日からの経過ミリ秒をbase36でエンコードしたもの] + 長さ4の[個体ID] + 長さ4の[カウンタ]
// (c) mei23
// https://misskey.m544.net/notes/71899acdcc9859ec5708ac24
import { customAlphabet } from 'nanoid';
export const aidxRegExp = /^[0-9a-z]{16}$/;
const TIME2000 = 946684800000;
const TIME_LENGTH = 8;
const NODE_LENGTH = 4;
const NOISE_LENGTH = 4;
const nodeId = customAlphabet('0123456789abcdefghijklmnopqrstuvwxyz', NODE_LENGTH)();
let counter = 0;
function getTime(time: number): string {
time = time - TIME2000;
if (time < 0) time = 0;
return time.toString(36).padStart(TIME_LENGTH, '0').slice(-TIME_LENGTH);
}
function getNoise(): string {
return counter.toString(36).padStart(NOISE_LENGTH, '0').slice(-NOISE_LENGTH);
}
export function genAidx(t: number): string {
if (isNaN(t)) throw new Error('Failed to create AIDX: Invalid Date');
counter++;
return getTime(t) + nodeId + getNoise();
}
export function parseAidx(id: string): { date: Date; } {
const time = parseInt(id.slice(0, TIME_LENGTH), 36) + TIME2000;
return { date: new Date(time) };
}
export function isSafeAidxT(t: number): boolean {
return t > TIME2000;
}
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