shareCalendarWithUser.js

/**
 * @desc Script for sharing Calender with domain users. 
 * Shared calender will be visible in users Calender interface
 *
 * Warning: Before running this script enable Calendar API via Advanced Google Services
 *  https://developers.google.com/apps-script/guides/services/advanced
 * @author Misha M.-Kupriyanov https://google.com/+MishaMKupriyanov
 * @require Calendar API
 * @link https://gist.github.com/printminion/cc23e0ae0e6119c77ec8
 */

var calendarACLCache = {}; //global cache


function test_shareCalender() {
  var calendarId = 'XXXXX@group.calendar.google.com';
  
  var email = 'user@domain.org';
  
  shareCalender_(calendarId, email)
}


function shareCalender_(calendarId, userId) {

  var aclRule = Calendar.newAclRule();
  
  aclRule.role = "writer";
  aclRule.scope = Calendar.newAclRuleScope();
  aclRule.scope.type = "user";
  aclRule.scope.value = userId;
  
  var response = Calendar.Acl.insert(aclRule, calendarId);

  Logger.log(response);
}

function shareCalender_(calendarId, userId) {
  
  if (isUserSubscribed(calendarId, userId)) {
    return true;
  }
  
  var aclRule = Calendar.newAclRule();
  
  aclRule.role = "writer";
  aclRule.scope = Calendar.newAclRuleScope();
  aclRule.scope.type = "user";
  aclRule.scope.value = userId;
  
  var response = Calendar.Acl.insert(aclRule, calendarId);
  
  calendarACLCache[calendarId] = getCalenderAcl(calendarId);
  
  Logger.log(response);
}

function getCalenderAcl(calendarId) {
  
  var optionalArgs = {'fileds' : 'items(role,scope)'};
  
  var response = Calendar.Acl.list(calendarId, optionalArgs);
  
  return response;
}

function isUserSubscribed(calendarId, userId) {
  
  var aclRules = calendarACLCache[calendarId];
  
  
  //load ACL rules if empty
  if (!aclRules) {
    aclRules = getCalenderAcl(calendarId);
    calendarACLCache[calendarId] = aclRules; 
  }
  
  var aclRule = null;
  for (var i in aclRules.items) {
    aclRule = aclRules.items[i];
    
    //if (aclRule['role'] == 'writer') {
    //}
    
    if (aclRule['scope']['value'] == userId) {
      return true;
    }
    
  }
  
  return false;
  
}