rbac-example.code.js

var ROLES = {
    PRESIDENT: {
        id: 1,
        actions: []
    }
};

const COUNTRYACTIONS = {
    FIRE_MISSILE: 1,
    VETO_LEGISLATION: 2,
    SIGN_LEGISLATION: 3
};

const COUNTRIES = {
    "USA": 1
};

var users = {
    "DonaldTrump": {},
    "JoeBiden": {}
};

function assignActionsToRoles(action, role) {
    role.actions.push(action);
}

function assignRolesToSubjects(subject, role, object) {
    subject.role = role;
    subject.object = object;
}

function revokeRoles(subject, role, object) {
    if (subject.role == role) {
        subject.role = null;
    }
    if (subject.object == object) {
        subject.object = null;
    }
}

function check(subject, action, object) {
    if (subject.object == object) {
        if (subject.role.actions.includes(action)) {
            return true;
        }
    }

    return false;
}

// long ago
assignActionsToRoles(COUNTRYACTIONS.FIRE_MISSILE, ROLES.PRESIDENT);

// 2016
assignRolesToSubjects(users["DonaldTrump"], ROLES.PRESIDENT, COUNTRIES.USA);
console.log(check(users["DonaldTrump"], COUNTRYACTIONS.FIRE_MISSILE, COUNTRIES.USA));

// 2020
revokeRoles(users["DonaldTrump"], ROLES.PRESIDENT, COUNTRIES.USA);
assignRolesToSubjects(users["JoeBiden"], ROLES.PRESIDENT, COUNTRIES.USA);

// can DonaldTrump still fire nuclear missile?
console.log(check(users["DonaldTrump"], COUNTRYACTIONS.FIRE_MISSILE, COUNTRIES.USA));

// can JoeBiden fire nuclear missile?
console.log(check(users["JoeBiden"], COUNTRYACTIONS.FIRE_MISSILE, COUNTRIES.USA));