diff --git a/packages/hydrooj/src/model/document.ts b/packages/hydrooj/src/model/document.ts
index 5f5c3870a..0e566d0d0 100644
--- a/packages/hydrooj/src/model/document.ts
+++ b/packages/hydrooj/src/model/document.ts
@@ -5,7 +5,7 @@ import {
 } from 'mongodb';
 import {
     Pdoc, Ddoc, Drdoc, Tdoc, TrainingDoc,
-    ProblemStatusDoc, User, Content,
+    ProblemStatusDoc, Content,
 } from '../interface';
 import { buildProjection } from '../utils';
 import { NumberKeys, ArrayKeys, Projection, MaybeArray } from '../typeutils';
@@ -44,11 +44,6 @@ export interface DocStatusType {
     [key: number]: any
 }
 
-export async function canView<T extends keyof DocType>(doc: DocType[T], user: User): Promise<boolean> {
-    if (doc.owner === user._id || doc.maintainers.includes(user._id) || doc.participants.includes(user._id)) return true;
-    if ()
-}
-
 export async function add<T extends keyof DocType, K extends DocType[T]['docId']>(
     domainId: string, content: Content, owner: number,
     docType: T, docId: K,
diff --git a/packages/hydrooj/src/model/system.ts b/packages/hydrooj/src/model/system.ts
index 4efb0bfb3..9c1a41327 100644
--- a/packages/hydrooj/src/model/system.ts
+++ b/packages/hydrooj/src/model/system.ts
@@ -15,22 +15,22 @@ export function get(key: string): any {
 
 export function getMany<
     A extends keyof SystemKeys, B extends keyof SystemKeys,
-    >(keys: [A, B]): [SystemKeys[A], SystemKeys[B]];
+>(keys: [A, B]): [SystemKeys[A], SystemKeys[B]];
 export function getMany<
     A extends keyof SystemKeys, B extends keyof SystemKeys, C extends keyof SystemKeys,
-    >(keys: [A, B, C]): [SystemKeys[A], SystemKeys[B], SystemKeys[C]];
+>(keys: [A, B, C]): [SystemKeys[A], SystemKeys[B], SystemKeys[C]];
 export function getMany<
     A extends keyof SystemKeys, B extends keyof SystemKeys, C extends keyof SystemKeys,
     D extends keyof SystemKeys,
-    >(keys: [A, B, C, D]): [SystemKeys[A], SystemKeys[B], SystemKeys[C], SystemKeys[D]];
+>(keys: [A, B, C, D]): [SystemKeys[A], SystemKeys[B], SystemKeys[C], SystemKeys[D]];
 export function getMany<
     A extends keyof SystemKeys, B extends keyof SystemKeys, C extends keyof SystemKeys,
     D extends keyof SystemKeys, E extends keyof SystemKeys,
-    >(keys: [A, B, C, D, E]): [SystemKeys[A], SystemKeys[B], SystemKeys[C], SystemKeys[D], SystemKeys[E]];
+>(keys: [A, B, C, D, E]): [SystemKeys[A], SystemKeys[B], SystemKeys[C], SystemKeys[D], SystemKeys[E]];
 export function getMany<
     A extends keyof SystemKeys, B extends keyof SystemKeys, C extends keyof SystemKeys,
     D extends keyof SystemKeys, E extends keyof SystemKeys, F extends keyof SystemKeys,
-    >(keys: [A, B, C, D, E, F]): [SystemKeys[A], SystemKeys[B], SystemKeys[C], SystemKeys[D], SystemKeys[E], SystemKeys[F]];
+>(keys: [A, B, C, D, E, F]): [SystemKeys[A], SystemKeys[B], SystemKeys[C], SystemKeys[D], SystemKeys[E], SystemKeys[F]];
 export function getMany(keys: (keyof SystemKeys)[]): any[];
 export function getMany(keys: string[]): any[] {
     return keys.map((key) => cache[key]);