schedule.js

const later = require('later');
const moment = require('moment-timezone');

module.exports = {
  hasValidTimezone,
  hasValidSchedule,
  isScheduledNow,
};

function fixShortHours(input) {
  return input.replace(/( \d?\d)((a|p)m)/g, '$1:00$2');
}

function hasValidTimezone(timezone) {
  if (!moment.tz.zone(timezone)) {
    return [false, `Invalid timezone: ${timezone}`];
  }
  return [true];
}

function hasValidSchedule(schedule) {
  let message;
  // check if any of the schedules fail to parse
  const hasFailedSchedules = schedule.some(scheduleText => {
    const massagedText = fixShortHours(scheduleText);
    const parsedSchedule = later.parse.text(massagedText);
    if (parsedSchedule.error !== -1) {
      message = `Failed to parse schedule "${scheduleText}"`;
      // It failed to parse
      return true;
    }
    if (parsedSchedule.schedules.some(s => s.m)) {
      message = `Schedule "${scheduleText}" should not specify minutes`;
      return true;
    }
    if (
      !parsedSchedule.schedules.some(
        s => s.d !== undefined || s.D || s.t_a !== undefined || s.t_b
      )
    ) {
      message = `Schedule "${scheduleText}" has no days of week or time of day`;
      return true;
    }
    // It must be OK
    return false;
  });
  if (hasFailedSchedules) {
    // If any fail then we invalidate the whole thing
    return [false, message];
  }
  return [true];
}

function isScheduledNow(config) {
  let configSchedule = config.schedule;
  logger.debug(
    { schedule: configSchedule, timezone: config.timezone },
    `Checking schedule`
  );
  if (
    !configSchedule ||
    configSchedule.length === 0 ||
    configSchedule[0] === ''
  ) {
    logger.debug('No schedule defined');
    return true;
  }
  if (!Array.isArray(configSchedule)) {
    logger.warn(
      `config schedule is not an array: ${JSON.stringify(configSchedule)}`