Creates a JavaScript object with Firebase like '.read'/'.write' properties from a given object

ObjectWithACL.js

function withACL(obj) {
  const __properties__ = {};
  
  if (typeof(obj) === 'object') {
    Object.keys(obj)
	  .forEach((key) => {
	     Object.defineProperty(this, key, {
		   get() {
		     if (!!__properties__[key].value) {
			   return __properties__[key].value;
			 } else {
			   return __properties__[key];
			 }
		   },
		   set(newValue) {
		     __properties__[key] = new withACL(newValue);
		   },
		 });
		 this[key] = obj[key];
	  });
  } else {
    this.value = obj;
	
	this['.read'] = {
	  users: {},
	  groups: {},
    };
	this.grantRead = function (entity) {
	  // check if array or string
	  // check each if user or group
	  this['.read'].users[entity] = true;
    };
	this.hasReadAccess = function () {
	  // return an array of all users (decompose groups into users) with 'true'
	  return this['.read'];
	};
	
    this['.write'] = {
	  users: {},
	  groups: {},
    };
    this.grantWrite = function (entity) {
	  // check if array or string
	  // check each if user or group
	  this['.write'].users[entity] = true;
	}
	this.hasWriteAccess = function () {
	  // return an array of all users (decompose groups into users) with 'true'
	  return this['.write'];
	};
  }
}