meteor login with pincode

pincode.js

Accounts.registerLoginHandler("pincode", function(loginRequest) {

	if (!loginRequest.pincode) {
		return undefined;
	}

	//FETCH USERID from collection 'Pincodes'
	var user = var user = Pincodes.findOne({
			pincode: loginRequest.pincode
		});;

	if (!user) {
		return {
			userId: null,
			error: "no user found"
		}
	} else {
		var userId = user._id;

		// Create hashed token so user stays logged in
		var stampedToken = Accounts._generateStampedLoginToken();
		var hashStampedToken = Accounts._hashStampedToken(stampedToken);
		// Update the user's token in mongo
		Meteor.users.update(userId, {
			$push: {
				'services.resume.loginTokens': hashStampedToken
			}
		});

		
		return {
			userId: userId,
			token: stampedToken.token
		};
	}

});

where this file should be placed, under libs, client or server?

Further more you can login via token on client side like this :
Meteor.loginWithToken(response.token);