RocketChat/Rocket.Chat

import { api, Message, Team } from '@rocket.chat/core-services';
import type { IRoom, IUser } from '@rocket.chat/core-typings';
import { isRoomFederated } from '@rocket.chat/core-typings';
import type { ServerMethods } from '@rocket.chat/ddp-client';
import { Subscriptions, Rooms, Users } from '@rocket.chat/models';
import { check } from 'meteor/check';
import { Meteor } from 'meteor/meteor';

import { hasPermissionAsync } from '../../app/authorization/server/functions/hasPermission';
import { notifyOnSubscriptionChangedById } from '../../app/lib/server/lib/notifyListener';
import { settings } from '../../app/settings/server';

declare module '@rocket.chat/ddp-client' {
    // eslint-disable-next-line @typescript-eslint/naming-convention
    interface ServerMethods {
        removeRoomModerator(rid: IRoom['_id'], userId: IUser['_id']): boolean;
    }
}

Meteor.methods<ServerMethods>({
    async removeRoomModerator(rid, userId) {
        check(rid, String);
        check(userId, String);

        const uid = Meteor.userId();

        if (!uid) {
            throw new Meteor.Error('error-invalid-user', 'Invalid user', {
                method: 'removeRoomModerator',
            });
        }

        const room = await Rooms.findOneById(rid, { projection: { t: 1, federated: 1 } });
        if (!room) {
            throw new Meteor.Error('error-invalid-room', 'Invalid room', {
                method: 'removeRoomModerator',
            });
        }

        if (!(await hasPermissionAsync(uid, 'set-moderator', rid)) && !isRoomFederated(room)) {
            throw new Meteor.Error('error-not-allowed', 'Not allowed', {
                method: 'removeRoomModerator',
            });
        }

        const user = await Users.findOneById(userId);

        if (!user?.username) {
            throw new Meteor.Error('error-invalid-user', 'Invalid user', {
                method: 'removeRoomModerator',
            });
        }

        const subscription = await Subscriptions.findOneByRoomIdAndUserId(rid, user._id);

        if (!subscription) {
            throw new Meteor.Error('error-invalid-room', 'Invalid room', {
                method: 'removeRoomModerator',
            });
        }

        if (subscription.roles && (!Array.isArray(subscription.roles) || !subscription.roles.includes('moderator'))) {
            throw new Meteor.Error('error-user-not-moderator', 'User is not a moderator', {
                method: 'removeRoomModerator',
            });
        }

        const removeRoleResponse = await Subscriptions.removeRoleById(subscription._id, 'moderator');
        if (removeRoleResponse.modifiedCount) {
            void notifyOnSubscriptionChangedById(subscription._id);
        }

        const fromUser = await Users.findOneById(uid);
        if (!fromUser) {
            throw new Meteor.Error('error-invalid-user', 'Invalid user', {
                method: 'removeRoomModerator',
            });
        }

        await Message.saveSystemMessage('subscription-role-removed', rid, user.username, fromUser, { role: 'moderator' });

        const team = await Team.getOneByMainRoomId(rid);
        if (team) {
            await Team.removeRolesFromMember(team._id, userId, ['moderator']);
        }

        const event = {
            type: 'removed',
            _id: 'moderator',
            u: {
                _id: user._id,
                username: user.username,
                name: user.name,
            },
            scope: rid,
        } as const;
        if (settings.get('UI_DisplayRoles')) {
            void api.broadcast('user.roleUpdate', event);
        }
        void api.broadcast('federation.userRoleChanged', { ...event, givenByUserId: uid });

        return true;
    },
});