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meidg (#4835)

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MeiMei 2019-05-05 09:29:15 +09:00 committed by syuilo
parent 7d64f8abe4
commit ff4f5fec1d
2 changed files with 30 additions and 0 deletions
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2
src/misc/gen-id.ts
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@ -1,6 +1,7 @@
import { ulid } from 'ulid';
import { genAid } from './id/aid';
import { genMeid } from './id/meid';
import { genMeidg } from './id/meidg';
import { genObjectId } from './id/object-id';
import config from '../config';
@ -12,6 +13,7 @@ export function genId(date?: Date): string {
switch (metohd) {
case 'aid': return genAid(date);
case 'meid': return genMeid(date);
case 'meidg': return genMeidg(date);
case 'ulid': return ulid(date.getTime());
case 'objectid': return genObjectId(date);
default: throw new Error('unknown id generation method');

28
src/misc/id/meidg.ts Normal file
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@ -0,0 +1,28 @@
const CHARS = '0123456789abcdef';
// 4bit Fixed hex value 'g'
// 44bit UNIX Time ms in Hex
// 48bit Random value in Hex
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(date: Date): string {
return 'g' + getTime(date.getTime()) + getRandom();
}