From ca00a08e6e8ad8636b2002bf8fabcf66d9566015 Mon Sep 17 00:00:00 2001
From: syuilo <Syuilotan@yahoo.co.jp>
Date: Wed, 6 Sep 2023 18:33:51 +0900
Subject: feat: introduce aidx and make it default

Co-Authored-By: MeiMei <30769358+mei23@users.noreply.github.com>
---
 packages/backend/src/core/IdService.ts |  3 +++
 packages/backend/src/misc/id/aidx.ts   | 44 ++++++++++++++++++++++++++++++++++
 2 files changed, 47 insertions(+)
 create mode 100644 packages/backend/src/misc/id/aidx.ts

(limited to 'packages/backend/src')

diff --git a/packages/backend/src/core/IdService.ts b/packages/backend/src/core/IdService.ts
index 186fd36b42..06c58ad8a1 100644
--- a/packages/backend/src/core/IdService.ts
+++ b/packages/backend/src/core/IdService.ts
@@ -8,6 +8,7 @@ import { ulid } from 'ulid';
 import { DI } from '@/di-symbols.js';
 import type { Config } from '@/config.js';
 import { genAid, parseAid } from '@/misc/id/aid.js';
+import { genAidx, parseAidx } from '@/misc/id/aidx.js';
 import { genMeid, parseMeid } from '@/misc/id/meid.js';
 import { genMeidg, parseMeidg } from '@/misc/id/meidg.js';
 import { genObjectId, parseObjectId } from '@/misc/id/object-id.js';
@@ -31,6 +32,7 @@ export class IdService {
 
 		switch (this.method) {
 			case 'aid': return genAid(date);
+			case 'aidx': return genAidx(date);
 			case 'meid': return genMeid(date);
 			case 'meidg': return genMeidg(date);
 			case 'ulid': return ulid(date.getTime());
@@ -43,6 +45,7 @@ export class IdService {
 	public parse(id: string): { date: Date; } {
 		switch (this.method) {
 			case 'aid': return parseAid(id);
+			case 'aidx': return parseAidx(id);
 			case 'objectid': return parseObjectId(id);
 			case 'meid': return parseMeid(id);
 			case 'meidg': return parseMeidg(id);
diff --git a/packages/backend/src/misc/id/aidx.ts b/packages/backend/src/misc/id/aidx.ts
new file mode 100644
index 0000000000..5b031ea4c0
--- /dev/null
+++ b/packages/backend/src/misc/id/aidx.ts
@@ -0,0 +1,44 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and other misskey contributors
+ * 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(date: Date): string {
+	const t = date.getTime();
+	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) };
+}
-- 
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