refactoring

Resolve #7779

packages/backend/src/server/api/endpoints/username/available.ts

@@ -0,0 +1,40 @@
+import $ from 'cafy';
+import define from '../../define';
+import { Users, UsedUsernames } from '@/models/index';
+
+export const meta = {
+	tags: ['users'],
+
+	requireCredential: false as const,
+
+	params: {
+		username: {
+			validator: $.use(Users.validateLocalUsername)
+		}
+	},
+
+	res: {
+		type: 'object' as const,
+		optional: false as const, nullable: false as const,
+		properties: {
+			available: {
+				type: 'boolean' as const,
+				optional: false as const, nullable: false as const,
+			}
+		}
+	}
+};
+
+export default define(meta, async (ps) => {
+	// Get exist
+	const exist = await Users.count({
+		host: null,
+		usernameLower: ps.username.toLowerCase()
+	});
+
+	const exist2 = await UsedUsernames.count({ username: ps.username.toLowerCase() });
+
+	return {
+		available: exist === 0 && exist2 === 0
+	};
+});