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/*
* SPDX-FileCopyrightText: syuilo and misskey-project
* SPDX-License-Identifier: AGPL-3.0-only
*/
import { parseBigInt16 } from '@/misc/bigint.js';
const CHARS = '0123456789abcdef';
// 4bit Fixed hex value 'g'
// 44bit UNIX Time ms in Hex
// 48bit Random value in Hex
export const meidgRegExp = /^g[0-9a-f]{23}$/;
function getTime(time: number) {
if (time < 0) time = 0;
if (time === 0) {
return CHARS[0];
}
return time.toString(16).padStart(11, CHARS[0]);
}
function getRandom() {
let str = '';
for (let i = 0; i < 12; i++) {
str += CHARS[Math.floor(Math.random() * CHARS.length)];
}
return str;
}
export function genMeidg(t: number): string {
return 'g' + getTime(t) + getRandom();
}
export function parseMeidg(id: string): { date: Date; } {
return {
date: new Date(parseInt(id.slice(1, 12), 16)),
};
}
export function parseMeidgFull(id: string): { date: number; additional: bigint; } {
return {
date: parseInt(id.slice(1, 12), 16),
additional: parseBigInt16(id.slice(12, 24)),
};
}
export function isSafeMeidgT(t: number): boolean {
return t > 0;
}
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