Rocket.Chat/packages/rocketchat-irc/server/irc-bridge/localHandlers/onCreateUser.js

export default function handleOnCreateUser(newUser) {
	if (!newUser) {
		return this.log('Invalid handleOnCreateUser call');
	}
	if (!newUser.username) {
		return this.log('Invalid handleOnCreateUser call (Missing username)');
	}
	if (this.loggedInUsers.indexOf(newUser._id) !== -1) {
		return this.log('Duplicate handleOnCreateUser call');
	}

	this.loggedInUsers.push(newUser._id);

	Meteor.users.update({ _id: newUser._id }, {
		$set: {
			'profile.irc.fromIRC': false,
			'profile.irc.username': `${ newUser.username }-rkt`,
			'profile.irc.nick': `${ newUser.username }-rkt`,
			'profile.irc.hostname': 'rocket.chat',
		},
	});

	const user = RocketChat.models.Users.findOne({
		_id: newUser._id,
	});

	this.sendCommand('registerUser', user);

	const rooms = RocketChat.models.Rooms.findBySubscriptionUserId(user._id).fetch();

	rooms.forEach((room) => this.sendCommand('joinedChannel', { room, user }));
}