RocketChat/Rocket.Chat

import type { IMessage } from '@rocket.chat/core-typings';
import type { ServerMethods } from '@rocket.chat/ddp-client';
import { Messages } from '@rocket.chat/models';
import { check } from 'meteor/check';
import { Meteor } from 'meteor/meteor';

import { canAccessRoomIdAsync } from '../../../authorization/server/functions/canAccessRoom';

declare module '@rocket.chat/ddp-client' {
    // eslint-disable-next-line @typescript-eslint/naming-convention
    interface ServerMethods {
        getMessages(messages: IMessage['_id'][]): Promise<IMessage[]>;
    }
}

Meteor.methods<ServerMethods>({
    async getMessages(messages) {
        check(messages, [String]);
        const uid = Meteor.userId();

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

        const msgs = await Messages.findVisibleByIds(messages).toArray();
        const rids = await Promise.all([...new Set(msgs.map((m) => m.rid))].map((_id) => canAccessRoomIdAsync(_id, uid)));

        if (!rids.every(Boolean)) {
            throw new Meteor.Error('error-not-allowed', 'Not allowed', { method: 'getSingleMessage' });
        }

        return msgs;
    },
});