expiration.js

'use strict'

const isValidMonth = require('is-valid-month')
const parseIntStrict = require('parse-int')
const parseYear = require('parse-year')

module.exports = {
  isPast: isPast,
  month: {
    parse: parseMonth,
    isValid: isValidMonth
  },
  year: {
    parse: parseYear,
    format: formatExpYear,
    isValid: isExpYearValid,
    isPast: isExpYearPast
  }
}

function isPast (month, year) {
  return Date.now() >= new Date(year, month)
}

function parseMonth (month) {
  return parseIntStrict(month)
}

function formatExpYear (year, strip) {
  year = year.toString()
  return strip ? year.substr(2, 4) : year
}

function isExpYearValid (year) {
  if (typeof year !== 'number') return false
  year = parseIntStrict(year)
  return year > 0
}

function isExpYearPast (year) {
  return new Date().getFullYear() > year
}