proxy & cookie storage experiments (use https://github.com/franciscop/cookies.js)

storage.js

cookies({ token: '42' , guestHash: 'sdjskdljskdjlkjsdUHYIUYHKJH', accountType: 'BUYER'})

var encapsulatedData = val => ({ value: val, lastAccess: new Date()})
var target = { 'token': null , 'guestHash': null, 'accountType': null }
//var authorizedKeys = Object.keys(target)
for (key in target) {
	//we encapsulate the data with Date of its last access
  target[key] = encapsulatedData(cookies(key))
}
var handler = {
	get (target, propKey, receiver) {
  	//console.log(`getting ${propKey} on target. Value = ${target[propKey]}`)
    //restoring the default behavior since data are encapsulated
    if (!(propKey in target)) {
    	return undefined
     }
    let propData = target[propKey]
    //if data was accessed more than 2 minutes ago,
    //we have to refetch it from the cookie (e.g. data might have changed)
    let now = new Date()
    if ( Math.floor( (now -  propData.lastAccess) / 60000 ) >= 2 ) {
    	console.log(`refetching ${propKey} cookie`)
    	propData.value = cookies(propKey)
      propData.lastAccess = now
    } else {
    	console.log(`reusing data for ${propKey}`)
    	//do nothing
    }
    	
    return propData.value
  },
  set (target, propKey, value, receiver) {
    if (!(propKey in target)) {
    	return false
    }
    target[propKey].value = cookies({ [propKey]: value })(propKey)
    target[propKey].lastAccess = new Date()
    return true
  },  
  defineProperty (target, propKey, descriptor) {
  	//console.log('forbidden fruit my son!')
  	return false
  }
}
//proxified storage
var proxy = new Proxy(target, handler)
console.log(target, proxy.token)
proxy.accountType = 'TEST BRUH!'
proxy.accountType = 'BUYER'
//cannot define a new property nor set a new one
proxy.toto = 'Test'
console.log(proxy.toto, proxy.accountType)
//access the data every 2 minute (proxy should perform a cookie refetching)
//then retry to access the refreshed data (proxy should reuse those refetched data)
window.setInterval(_ => console.log(proxy.toto, proxy.accountType, proxy.accountType), 120000)