Add meid

src/misc/gen-id.ts

@@ -1,5 +1,6 @@
 import { ulid } from 'ulid';
 import { genAid } from './id/aid';
+import { genMeid } from './id/meid';
 import { genObjectId } from './id/object-id';
 import config from '../config';
 
@@ -10,6 +11,7 @@ export function genId(date?: Date): string {
 
 	switch (metohd) {
 		case 'aid': return genAid(date);
+		case 'meid': return genMeid(date);
 		case 'ulid': return ulid(date.getTime());
 		case 'objectid': return genObjectId(date);
 		default: throw 'unknown id generation method';

src/misc/id/meid.ts

@@ -0,0 +1,24 @@
+const CHARS = '0123456789abcdef';
+
+function getTime(time: number) {
+	if (time < 0) time = 0;
+	if (time === 0) {
+		return CHARS[0];
+	}
+
+	return time.toString(16).padStart(16, CHARS[0]);
+}
+
+function getRandom() {
+	let str = '';
+
+	for (let i = 0; i < 7; i++) {
+		str += CHARS[Math.floor(Math.random() * CHARS.length)];
+	}
+
+	return str;
+}
+
+export function genMeid(date: Date): string {
+	return 'f' + getTime(date.getTime()) + getRandom();
+}