Added '@' as a illegal character for usernames

ref #93

src/models/actions/create/CreateUser.ts

@@ -3,7 +3,7 @@ import { IsBoolean, IsEmail, IsNotEmpty, IsOptional, IsPhoneNumber, IsString, Is
 import { getConnectionManager } from 'typeorm';
 import * as uuid from 'uuid';
 import { config } from '../../../config';
-import { UserEmailNeededError } from '../../../errors/UserErrors';
+import { UserEmailNeededError, UsernameContainsIllegalCharacterError } from '../../../errors/UserErrors';
 import { UserGroupNotFoundError } from '../../../errors/UserGroupErrors';
 import { User } from '../../entities/User';
 import { UserGroup } from '../../entities/UserGroup';
@@ -94,6 +94,7 @@ export class CreateUser {
         if (!this.email) {
             throw new UserEmailNeededError();
         }
+        if (this.username.includes("@")) { throw new UsernameContainsIllegalCharacterError(); }
 
         newUser.email = this.email
         newUser.username = this.username