refactoring

Resolve #7779

4 files changed, 105 insertions, 0 deletions

diff --git a/packages/backend/src/misc/id/aid.ts b/packages/backend/src/misc/id/aid.ts
new file mode 100644
index 0000000000..2bcde90bff
--- /dev/null
+++ b/packages/backend/src/misc/id/aid.ts
@@ -0,0 +1,25 @@
+// AID
+// 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2の[ノイズ文字列]
+
+import * as crypto from 'crypto';
+
+const TIME2000 = 946684800000;
+let counter = crypto.randomBytes(2).readUInt16LE(0);
+
+function getTime(time: number) {
+	time = time - TIME2000;
+	if (time < 0) time = 0;
+
+	return time.toString(36).padStart(8, '0');
+}
+
+function getNoise() {
+	return counter.toString(36).padStart(2, '0').slice(-2);
+}
+
+export function genAid(date: Date): string {
+	const t = date.getTime();
+	if (isNaN(t)) throw 'Failed to create AID: Invalid Date';
+	counter++;
+	return getTime(t) + getNoise();
+}
diff --git a/packages/backend/src/misc/id/meid.ts b/packages/backend/src/misc/id/meid.ts
new file mode 100644
index 0000000000..30bbdf1698
--- /dev/null
+++ b/packages/backend/src/misc/id/meid.ts
@@ -0,0 +1,26 @@
+const CHARS = '0123456789abcdef';
+
+function getTime(time: number) {
+	if (time < 0) time = 0;
+	if (time === 0) {
+		return CHARS[0];
+	}
+
+	time += 0x800000000000;
+
+	return time.toString(16).padStart(12, 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 genMeid(date: Date): string {
+	return getTime(date.getTime()) + getRandom();
+}
diff --git a/packages/backend/src/misc/id/meidg.ts b/packages/backend/src/misc/id/meidg.ts
new file mode 100644
index 0000000000..d4aaaea1ba
--- /dev/null
+++ b/packages/backend/src/misc/id/meidg.ts
@@ -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();
+}
diff --git a/packages/backend/src/misc/id/object-id.ts b/packages/backend/src/misc/id/object-id.ts
new file mode 100644
index 0000000000..392ea43301
--- /dev/null
+++ b/packages/backend/src/misc/id/object-id.ts
@@ -0,0 +1,26 @@
+const CHARS = '0123456789abcdef';
+
+function getTime(time: number) {
+	if (time < 0) time = 0;
+	if (time === 0) {
+		return CHARS[0];
+	}
+
+	time = Math.floor(time / 1000);
+
+	return time.toString(16).padStart(8, CHARS[0]);
+}
+
+function getRandom() {
+	let str = '';
+
+	for (let i = 0; i < 16; i++) {
+		str += CHARS[Math.floor(Math.random() * CHARS.length)];
+	}
+
+	return str;
+}
+
+export function genObjectId(date: Date): string {
+	return getTime(date.getTime()) + getRandom();
+}