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Viewing file:     validator.js (5.36 KB)      -rw-r--r--

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});

/**
 * Copyright (c) 2017, Dirk-Jan Rutten
 * All rights reserved.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 */

// Check whether a certain year is a leap year.
//
// Every year that is exactly divisible by four
// is a leap year, except for years that are exactly
// divisible by 100, but these centurial years are
// leap years if they are exactly divisible by 400.
// For example, the years 1700, 1800, and 1900 are not leap years,
// but the years 1600 and 2000 are.
//
var leapYear = function leapYear(year) {
  return year % 4 === 0 && year % 100 !== 0 || year % 400 === 0;
};

// Function that checks whether a time-string is RFC 3339 compliant.
//
// It checks whether the time-string is structured in one of the
// following formats:
//
// - hh:mm:ssZ
// - hh:mm:ss±hh:mm
// - hh:mm:ss.*sZ
// - hh:mm:ss.*s±hh:mm
//
// Where *s is a fraction of seconds with at least 1 digit.
//
// Note, this validator assumes that all minutes have
// 59 seconds. This assumption does not follow RFC 3339
// which includes leap seconds (in which case it is possible that
// there are 60 seconds in a minute).
//
// Leap seconds are ignored because it adds complexity in
// the following areas:
// - The native Javascript Date ignores them; i.e. Date.parse('1972-12-31T23:59:60Z')
//   equals NaN.
// - Leap seconds cannot be known in advance.
//
var validateTime = exports.validateTime = function validateTime(time) {
  var TIME_REGEX = /^([01][0-9]|2[0-3]):([0-5][0-9]):([0-5][0-9])(\.\d{1,})?(([Z])|([+|-]([01][0-9]|2[0-3]):[0-5][0-9]))$/;
  return TIME_REGEX.test(time);
};

// Function that checks whether a date-string is RFC 3339 compliant.
//
// It checks whether the date-string is a valid date in the YYYY-MM-DD.
//
// Note, the number of days in each date are determined according to the
// following lookup table:
//
// Month Number  Month/Year           Maximum value of date-mday
// ------------  ----------           --------------------------
// 01            January              31
// 02            February, normal     28
// 02            February, leap year  29
// 03            March                31
// 04            April                30
// 05            May                  31
// 06            June                 30
// 07            July                 31
// 08            August               31
// 09            September            30
// 10            October              31
// 11            November             30
// 12            December             31
//
var validateDate = exports.validateDate = function validateDate(datestring) {
  var RFC_3339_REGEX = /^(\d{4}-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01]))$/;

  if (!RFC_3339_REGEX.test(datestring)) {
    return false;
  }

  // Verify the correct number of days for
  // the month contained in the date-string.
  var year = Number(datestring.substr(0, 4));
  var month = Number(datestring.substr(5, 2));
  var day = Number(datestring.substr(8, 2));

  switch (month) {
    case 2:
      // February
      if (leapYear(year) && day > 29) {
        return false;
      } else if (!leapYear(year) && day > 28) {
        return false;
      }
      return true;
    case 4: // April
    case 6: // June
    case 9: // September
    case 11:
      // November
      if (day > 30) {
        return false;
      }
      break;
  }

  return true;
};

// Function that checks whether a date-time-string is RFC 3339 compliant.
//
// It checks whether the time-string is structured in one of the
//
// - YYYY-MM-DDThh:mm:ssZ
// - YYYY-MM-DDThh:mm:ss±hh:mm
// - YYYY-MM-DDThh:mm:ss.*sZ
// - YYYY-MM-DDThh:mm:ss.*s±hh:mm
//
// Where *s is a fraction of seconds with at least 1 digit.
//
var validateDateTime = exports.validateDateTime = function validateDateTime(dateTimeString) {
  var RFC_3339_REGEX = /^(\d{4}-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])T([01][0-9]|2[0-3]):([0-5][0-9]):([0-5][0-9]|60))(\.\d{1,})?(([Z])|([+|-]([01][0-9]|2[0-3]):[0-5][0-9]))$/;

  // Validate the structure of the date-string
  if (!RFC_3339_REGEX.test(dateTimeString)) {
    return false;
  }

  // Check if it is a correct date using the javascript Date parse() method.
  var time = Date.parse(dateTimeString);
  if (time !== time) {
    // eslint-disable-line
    return false;
  }
  // Split the date-time-string up into the string-date and time-string part.
  // and check whether these parts are RFC 3339 compliant.
  var index = dateTimeString.indexOf('T');
  var dateString = dateTimeString.substr(0, index);
  var timeString = dateTimeString.substr(index + 1);
  return validateDate(dateString) && validateTime(timeString);
};

// Function that checks whether a given number is a valid
// Unix timestamp.
//
// Unix timestamps are signed 32-bit integers. They are interpreted
// as the number of seconds since 00:00:00 UTC on 1 January 1970.
//
var validateUnixTimestamp = exports.validateUnixTimestamp = function validateUnixTimestamp(timestamp) {
  var MAX_INT = 2147483647;
  var MIN_INT = -2147483648;
  return timestamp === timestamp && timestamp <= MAX_INT && timestamp >= MIN_INT; // eslint-disable-line
};

// Function that checks whether a javascript Date instance
// is valid.
//
var validateJSDate = exports.validateJSDate = function validateJSDate(date) {
  var time = date.getTime();
  return time === time; // eslint-disable-line
};