gas_gcal_pto_group_sync.js

/**
 * Google Calendar PTO Sync
 * 
 * This Google Apps Script automatically syncs "out of office" events from team members' calendars 
 * to a shared team calendar. It searches for events matching specific keywords (e.g., "PTO", "OOO", "vacation") 
 * and imports them into the team calendar. The script is designed to run on an hourly basis and includes options 
 * to filter direct and indirect group members. It also handles duplicate events and ensures events are only added 
 * if they occur on weekdays.
 * 
 * Author: Google
 * Editor: Chad Ramey
 * Date: August 14, 2024
 * 
 * To learn how to use this script, refer to the documentation:
 * https://developers.google.com/apps-script/samples/automations/vacation-calendar
 */

// Set the ID of the team calendar to add events to. You can find the calendar's
// ID on the settings page.
let TEAM_CALENDAR_ID = ''; // Team Calendar ID
// Set the email address of the Google Group that contains everyone in the team.
// Ensure the group has less than 500 members to avoid timeouts.
// Change to an array in order to add indirect members frrm multiple groups, for example:
// let GROUP_EMAIL = ['ENTER_GOOGLE_GROUP_EMAIL_HERE', 'ENTER_ANOTHER_GOOGLE_GROUP_EMAIL_HERE'];
let GROUP_EMAIL = 'group@domain.com';

let ONLY_DIRECT_MEMBERS = false;

let KEYWORDS = ['pto', 'ooo', 'out of office', 'offline', 'vacation', 'PTO', 'Off', 'off', 'Out of office'];
let MONTHS_IN_ADVANCE = 3;

/**
 * Sets up the script to run automatically every hour.
 */
function setup() {
  let triggers = ScriptApp.getProjectTriggers();
  if (triggers.length > 0) {
    throw new Error('Triggers are already setup.');
  }
  ScriptApp.newTrigger('sync').timeBased().everyHours(1).create();
  // Runs the first sync immediately.
  sync();
}

/**
 * Looks through the group members' public calendars and adds any
 * 'vacation' or 'out of office' events to the team calendar.
 */
function sync() {
  // Defines the calendar event date range to search.
  let today = new Date();
  let maxDate = new Date();
  maxDate.setMonth(maxDate.getMonth() + MONTHS_IN_ADVANCE);

  // Determines the time the the script was last run.
  let lastRun = PropertiesService.getScriptProperties().getProperty('lastRun');
  lastRun = lastRun ? new Date(lastRun) : null;

  // Gets the list of users in the Google Group.
  let users = getAllMembers(GROUP_EMAIL);
  if (ONLY_DIRECT_MEMBERS){
    users = GroupsApp.getGroupByEmail(GROUP_EMAIL).getUsers();
  } else if (Array.isArray(GROUP_EMAIL)) {
    users = getUsersFromGroups(GROUP_EMAIL);
  }

  // For each user, finds events having one or more of the keywords in the event
  // summary in the specified date range. Imports each of those to the team
  // calendar.
  let count = 0;
  users.forEach(function(user) {
    let username = user.getEmail().split('@')[0];
    KEYWORDS.forEach(function(keyword) {
      let events = findEvents(user, keyword, today, maxDate, lastRun);
      events.forEach(function(event) {
        importEvent(username, event);
        count++;
      }); // End foreach event.
    }); // End foreach keyword.
  }); // End foreach user.

  PropertiesService.getScriptProperties().setProperty('lastRun', today);
  console.log('Imported ' + count + ' events');
}

/**
 * Imports the given event from the user's calendar into the shared team
 * calendar.
 * @param {string} username The team member that is attending the event.
 * @param {Calendar.Event} event The event to import.
 */
function importEvent(username, event) {
  event.summary = '[' + username + '] ' + event.summary;
  event.organizer = {
    id: TEAM_CALENDAR_ID,
  };
  event.attendees = [];

  // If the event is not of type 'default', it can't be imported, so it needs
  // to be changed.
  if (event.eventType != 'default') {
    event.eventType = 'default';
    delete event.outOfOfficeProperties;
    delete event.focusTimeProperties;
  }

  console.log('Importing: %s', event.summary);
  try {
    Calendar.Events.import(event, TEAM_CALENDAR_ID);
  } catch (e) {
    console.error('Error attempting to import event: %s. Skipping.',
        e.toString());
  }
}

/**
 * In a given user's calendar, looks for occurrences of the given keyword
 * in events within the specified date range and returns any such events
 * found.
 * @param {Session.User} user The user to retrieve events for.
 * @param {string} keyword The keyword to look for.
 * @param {Date} start The starting date of the range to examine.
 * @param {Date} end The ending date of the range to examine.
 * @param {Date} optSince A date indicating the last time this script was run.
 * @return {Calendar.Event[]} An array of calendar events.
 */
function findEvents(user, keyword, start, end, optSince) {
  let params = {
    q: keyword,
    timeMin: formatDateAsRFC3339(start),
    timeMax: formatDateAsRFC3339(end),
    showDeleted: true,
  };
  if (optSince) {
    // This prevents the script from examining events that have not been
    // modified since the specified date (that is, the last time the
    // script was run).
    params.updatedMin = formatDateAsRFC3339(optSince);
  }
  let pageToken = null;
  let events = [];
  do {
    params.pageToken = pageToken;
    let response;
    try {
      response = Calendar.Events.list(user.getEmail(), params);
    } catch (e) {
      console.error('Error retriving events for %s, %s: %s; skipping',
          user, keyword, e.toString());
      continue;
    }
    events = events.concat(response.items.filter(function(item) {
      return shouldImportEvent(user, keyword, item);
    }));
    pageToken = response.nextPageToken;
  } while (pageToken);
  return events;
}

/**
 * Determines if the given event should be imported into the shared team
 * calendar and ensures that it falls on a weekday (Monday - Friday).
 * @param {Session.User} user The user that is attending the event.
 * @param {string} keyword The keyword being searched for.
 * @param {Calendar.Event} event The event being considered.
 * @return {boolean} True if the event should be imported.
 */
function shouldImportEvent(user, keyword, event) {
  // Filters out events where the keyword did not appear in the summary
  // (that is, the keyword appeared in a different field, and are thus
  // not likely to be relevant).
  if (event.summary.toLowerCase().indexOf(keyword) < 0) {
    return false;
  }

  // Check if the event falls on a weekday (Monday - Friday).
  let eventStartDate = new Date(event.start.dateTime || event.start.date);
  let dayOfWeek = eventStartDate.getUTCDay(); // 0 = Sunday, 6 = Saturday
  if (dayOfWeek === 0 || dayOfWeek === 6) {
    // Exclude events occurring on Saturday (6) or Sunday (0).
    return false;
  }

  if (!event.organizer || event.organizer.email === user.getEmail()) {
    // If the user is the creator of the event, always imports it.
    return true;
  }

  // Only imports events the user has accepted.
  if (!event.attendees) return false;
  let matching = event.attendees.filter(function (attendee) {
    return attendee.self;
  });
  return matching.length > 0 && matching[0].responseStatus === 'accepted';
}


/**
 * Returns an RFC3339 formated date String corresponding to the given
 * Date object.
 * @param {Date} date a Date.
 * @return {string} a formatted date string.
 */
function formatDateAsRFC3339(date) {
  return Utilities.formatDate(date, 'UTC', 'yyyy-MM-dd\'T\'HH:mm:ssZ');
}

/**
* Get both direct and indirect members (and delete duplicates).
* @param {string} the e-mail address of the group.
* @return {object} direct and indirect members.
*/
function getAllMembers(groupEmail) {
  var group = GroupsApp.getGroupByEmail(groupEmail);
  var users = group.getUsers();
  var childGroups = group.getGroups();
  for (var i = 0; i < childGroups.length; i++) {
    var childGroup = childGroups[i];
    users = users.concat(getAllMembers(childGroup.getEmail()));
  }
  // Remove duplicate members
  var uniqueUsers = [];
  var userEmails = {};
  for (var i = 0; i < users.length; i++) {
    var user = users[i];
    if (!userEmails[user.getEmail()]) {
      uniqueUsers.push(user);
      userEmails[user.getEmail()] = true;
    }
  }
  return uniqueUsers;
}

/**
* Get indirect members from multiple groups (and delete duplicates).
* @param {array} the e-mail addresses of multiple groups.
* @return {object} indirect members of multiple groups.
*/
function getUsersFromGroups(groupEmails) {
  let users = [];
  for (let groupEmail of groupEmails) {
    let groupUsers = GroupsApp.getGroupByEmail(groupEmail).getUsers();
    for (let user of groupUsers) {
      if (!users.some(u => u.getEmail() === user.getEmail())) {
        users.push(user);
      }
    }
  }
  return users;
}