[API] Fix bug and extract validator

src/api/endpoints/i/update.js

@@ -5,7 +5,7 @@
  */
 import * as mongo from 'mongodb';
 import User from '../../models/user';
-import { isValidBirthday } from '../../models/user';
+import { isValidName, isValidBirthday } from '../../models/user';
 import serialize from '../../serializers/user';
 import event from '../../event';
 import config from '../../../conf';
@@ -25,8 +25,8 @@ module.exports = async (params, user, _, isSecure) =>
 	// Get 'name' parameter
 	const name = params.name;
 	if (name !== undefined && name !== null) {
-		if (name.length > 50) {
-			return rej('too long name');
+		if (!isValidName(name)) {
+			return rej('invalid name');
 		}
 
 		user.name = name;

src/api/models/user.ts

@@ -15,6 +15,10 @@ export function validatePassword(password: string): boolean {
 	return typeof password == 'string' && password != '';
 }
 
+export function isValidName(name: string): boolean {
+	return typeof name == 'string' && name.length > 50 && name.trim() != '';
+}
+
 export function isValidBirthday(birthday: string): boolean {
 	return typeof birthday == 'string' && /^([0-9]{4})\-([0-9]{2})-([0-9]{2})$/.test(birthday);
 }