Using Directory API in Google-Apps-Script, how to get groups inside a group

Question

I\'m working on a script that gets all goups in my domain and lists all users in these groups.

I rewrote this script because GroupsManager is deprecated

Answer 1

AdminDirectory MembersCollection might be what you are looking for.

Example snippet:

var members = AdminDirectory.Members.list('testgroup@example.com').members;
for (var i = 0; i < members.length; i++) {
  var member = members[i];
  switch (member.type) {
    case 'USER':
      Logger.log('%s is a user', member.email);
      break;
    case 'GROUP':
      Logger.log('%s is a group', member.email);
      break;
    default:
      Logger.log('This will never happen');
  }

Some of my customers have groups containing groups contaning groups... forming a group tree with arbitrary depth. I use this code to get all user members in such a group tree:

function walkTreeStack() {
  var rootGroup = 'testgroup@example.com';
  var groupTreeUsers = [];
  var groups = [];
  groups.push(rootGroup);

  while (groups.length > 0) {
    var currentGroup = groups.pop();
    var groupName = AdminDirectory.Groups.get(currentGroup).name;
    var groupMembers = getAllMembers_(currentGroup);

    for (var i in groupMembers) {
      if (groupMembers[i].type == 'USER') {
        groupTreeUsers.push([groupName, groupMembers[i].email])
      }
      else if (groupMembers[i].type == 'GROUP') {
        groups.push(groupMembers[i].email)
      }
    }
  }

  Logger.log('There are %s user members in %s (including sub groups)', groupTreeUsers.length, groupName);
}

function getAllMembers_(group) {
  var memberPageToken, memberPage;
  var members = [];
  do {
    memberPage = AdminDirectory.Members.list(group, {
      maxResults: 200,
      pageToken: memberPageToken
    });
    var pageMembers = memberPage.members;
    if (pageMembers) {
      for (var j =0; j < pageMembers.length; j++) {
        members.push(pageMembers[j]);
      }
    }
    memberPageToken = memberPage.nextPageToken;
  } while (memberPageToken);
  return members;
}

It's slightly faster if it's done recursively but I suspect the script might crash due to memory constraints if there are a large number of sub groups and user members:

function getGroupTreeMembers() {
  var rootGroup = 'testgroup@example.com';
  var groupTreeUsers = [];

  walkTreeRecursive_(rootGroup, groupTreeUsers);

  var groupName = AdminDirectory.Groups.get(rootGroup).name;  
  Logger.log('There are %s user members in %s (including sub groups)', groupTreeUsers.length, groupName);
}

function walkTreeRecursive_(rootGroup, groupTreeUsers) {
  var groupName = AdminDirectory.Groups.get(rootGroup).name;
  var groupMembers = getAllMembers_(rootGroup);
  var groups = [];
  for (var i in groupMembers) {
    if (groupMembers[i].type == 'USER') {
      groupTreeUsers.push([groupName, groupMembers[i].email])
    }
    else if (groupMembers[i].type == 'GROUP') {
      groups.push(groupMembers[i].email)
    }
  }
  for (var i in groups) {
    walkTreeRecursive_(groups[i], groupTreeUsers);
  }
}

For more information please visit:

https://developers.google.com/admin-sdk/directory/v1/reference/members#resource