Rocket.Chat/apps/meteor/app/lib/server/methods/addUsersToRoom.ts

import { Meteor } from 'meteor/meteor';
import { Match } from 'meteor/check';
import { api } from '@rocket.chat/core-services';
import type { IUser } from '@rocket.chat/core-typings';
import { isRoomFederated } from '@rocket.chat/core-typings';
import type { ServerMethods } from '@rocket.chat/ui-contexts';
import { Subscriptions, Users, Rooms } from '@rocket.chat/models';

import { hasPermissionAsync } from '../../../authorization/server/functions/hasPermission';
import { addUserToRoom } from '../functions';
import { callbacks } from '../../../../lib/callbacks';
import { Federation } from '../../../../server/services/federation/Federation';
import { i18n } from '../../../../server/lib/i18n';

declare module '@rocket.chat/ui-contexts' {
	// eslint-disable-next-line @typescript-eslint/naming-convention
	interface ServerMethods {
		addUsersToRoom(data: { rid: string; users: string[] }): boolean;
	}
}

export const addUsersToRoomMethod = async (userId: string, data: { rid: string; users: string[] }, user?: IUser): Promise<boolean> => {
	if (!userId) {
		throw new Meteor.Error('error-invalid-user', 'Invalid user', {
			method: 'addUsersToRoom',
		});
	}

	if (!Match.test(data.rid, String)) {
		throw new Meteor.Error('error-invalid-room', 'Invalid room', {
			method: 'addUsersToRoom',
		});
	}

	// Get user and room details
	const room = await Rooms.findOneById(data.rid);
	if (!room) {
		throw new Meteor.Error('error-invalid-room', 'Invalid room', {
			method: 'addUsersToRoom',
		});
	}

	const subscription = await Subscriptions.findOneByRoomIdAndUserId(data.rid, userId, {
		projection: { _id: 1 },
	});
	const userInRoom = subscription != null;

	// Can't add to direct room ever
	if (room.t === 'd') {
		throw new Meteor.Error('error-cant-invite-for-direct-room', "Can't invite user to direct rooms", {
			method: 'addUsersToRoom',
		});
	}

	// Can add to any room you're in, with permission, otherwise need specific room type permission
	let canAddUser = false;
	if (userInRoom && (await hasPermissionAsync(userId, 'add-user-to-joined-room', room._id))) {
		canAddUser = true;
	} else if (room.t === 'c' && (await hasPermissionAsync(userId, 'add-user-to-any-c-room'))) {
		canAddUser = true;
	} else if (room.t === 'p' && (await hasPermissionAsync(userId, 'add-user-to-any-p-room'))) {
		canAddUser = true;
	}

	// Adding wasn't allowed
	if (!canAddUser) {
		throw new Meteor.Error('error-not-allowed', 'Not allowed', {
			method: 'addUsersToRoom',
		});
	}

	// Missing the users to be added
	if (!Array.isArray(data.users)) {
		throw new Meteor.Error('error-invalid-arguments', 'Invalid arguments', {
			method: 'addUsersToRoom',
		});
	}

	// Validate each user, then add to room
	if (isRoomFederated(room)) {
		await callbacks.run('federation.onAddUsersToARoom', { invitees: data.users, inviter: user }, room);
		return true;
	}

	await Promise.all(
		data.users.map(async (username) => {
			const newUser = await Users.findOneByUsernameIgnoringCase(username);
			if (!newUser && !Federation.isAFederatedUsername(username)) {
				throw new Meteor.Error('error-invalid-username', 'Invalid username', {
					method: 'addUsersToRoom',
				});
			}
			const subscription = newUser && (await Subscriptions.findOneByRoomIdAndUserId(data.rid, newUser._id));
			if (!subscription) {
				await addUserToRoom(data.rid, newUser || username, user);
			} else {
				if (!newUser.username) {
					return;
				}
				void api.broadcast('notify.ephemeralMessage', userId, data.rid, {
					msg: i18n.t(
						'Username_is_already_in_here',
						{
							postProcess: 'sprintf',
							sprintf: [newUser.username],
						},
						user?.language,
					),
				});
			}
		}),
	);

	return true;
};

Meteor.methods<ServerMethods>({
	async addUsersToRoom(data) {
		const uid = Meteor.userId();
		// Validate user and room
		if (!uid) {
			throw new Meteor.Error('error-invalid-user', 'Invalid user', {
				method: 'addUsersToRoom',
			});
		}

		return addUsersToRoomMethod(uid, data, ((await Meteor.userAsync()) as IUser | null) ?? undefined);
	},
});