core: support ban user from domain

packages/hydrooj/src/handler/domain.ts

@@ -345,7 +345,8 @@ class DomainJoinHandler extends Handler {
         const roles = r.map((role) => role._id);
         this.joinSettings = domain.getJoinSettings(ddoc, roles);
         if (assignedRole !== 'default') delete this.joinSettings;
-        else if (!this.joinSettings) throw new DomainJoinForbiddenError(target);
+        else if (!this.joinSettings) throw new DomainJoinForbiddenError(target, 'The link is either invalid or expired.');
+        if (assignedRole === 'guest') throw new DomainJoinForbiddenError(target, 'You are banned by the domain moderator.');
     }
 
     @param('code', Types.Content, true)

packages/hydrooj/src/handler/home.ts

@@ -7,7 +7,7 @@ import { Binary, ObjectId } from 'mongodb';
 import { UAParser } from 'ua-parser-js';
 import { Context } from '../context';
 import {
-    AuthOperationError, BlacklistedError, DomainAlreadyExistsError, InvalidTokenError,
+    AuthOperationError, BadRequestError, BlacklistedError, DomainAlreadyExistsError, InvalidTokenError,
     NotFoundError, PermissionError, UserAlreadyExistError,
     UserNotFoundError, ValidationError, VerifyPasswordError,
 } from '../error';
@@ -507,6 +507,7 @@ class HomeDomainHandler extends Handler {
 
     @param('id', Types.String)
     async postLeave({ }, id: string) {
+        if (id === 'system') throw new BadRequestError();
         const ddoc = await domain.get(id);
         if (!ddoc) throw new NotFoundError(id);
         await domain.setJoin(id, this.user._id, false);