[API] Implement users/relation

src/server/api/endpoints/users/relation.ts

@@ -0,0 +1,28 @@
+import $ from 'cafy'; import ID from '../../../../misc/cafy-id';
+import { ILocalUser, getRelation } from '../../../../models/user';
+import getParams from '../../get-params';
+
+export const meta = {
+	desc: {
+		'ja-JP': 'ユーザー間のリレーションを取得します。'
+	},
+
+	params: {
+		userId: $.or($.type(ID), $.arr($.type(ID)).unique()).note({
+			desc: {
+				'ja-JP': 'ユーザーID (配列でも可)'
+			}
+		})
+	}
+};
+
+export default (params: any, me: ILocalUser) => new Promise(async (res, rej) => {
+	const [ps, psErr] = getParams(meta, params);
+	if (psErr) return rej(psErr);
+
+	const ids = Array.isArray(ps.userId) ? ps.userId : [ps.userId];
+
+	const relations = await Promise.all(ids.map(id => getRelation(me._id, id)));
+
+	res(Array.isArray(ps.userId) ? relations : relations[0]);
+});