RocketChat/Rocket.Chat

import { Users } from '@rocket.chat/models';

export const normalizeExternalInviteeId = (rawInviteeId: string): string => `@${rawInviteeId.replace(/@/g, '')}`;

const validateExternalInviteeIdFormat = async (rawInviteeId: string, inviterId: string): Promise<void> => {
    const inviter = await Users.findOneById(inviterId);
    const isInviterExternal = inviter?.federated === true || inviter?.username?.includes(':');
    const localUserInvitingAnotherLocalUser = !rawInviteeId.includes(':') && !isInviterExternal;
    if (localUserInvitingAnotherLocalUser) {
        throw new Error('Invalid userId format for federation command.');
    }
};

export const executeSlashCommand = async (
    providedCommand: string,
    stringParams: string | undefined,
    item: Record<string, any>,
    commands: Record<string, (currentUserId: string, roomId: string, invitee: string) => Promise<void>>,
    currentUserId?: string | null,
): Promise<void> => {
    if (providedCommand !== 'federation' || !stringParams) {
        return;
    }

    const [command, ...params] = stringParams.trim().split(' ');
    const [rawUserId] = params;
    if (!currentUserId || !commands[command]) {
        return;
    }

    await validateExternalInviteeIdFormat(rawUserId, currentUserId);

    const invitee = normalizeExternalInviteeId(rawUserId);

    const { rid: roomId } = item;

    await commands[command](currentUserId, roomId, invitee);
};