Migrate from Groups Service to Cloud Identity Groups Advanced Service

Cloud Identity Groups (CIG) Advanced Service provides feature parity to the Groups Service API and can be used in its stead.

See the helper methods provided to learn how to achieve equivalent capabilities through CIG Advanced Service.

Setup

To use CIG Advanced Service, first enable it within your script project.

To shorten some of the method signatures in this guide, we defined the following variable:

const groups = CloudIdentityGroups.Groups;

GroupsApp Methods

The following helper methods correspond to those of the Groups Service GroupsApp.

In this guide, the term group refers to a Group Resource, as opposed to a Group Class object. Group Resources are JavaScript objects that don't have methods, but they can be used in CIG Advanced Service to retrieve similar information to that in Group Class objects.

getGroupByEmail

/**
 * Given a group's email, returns that group's resource
 *
 * @param {String} email: The email address to lookup a group by
 * @return {Group} group: The group resource associated with the email
 */
function groupsAppGetGroupByEmail(email) {
  // Retrieve the name ID of the group
  const groupName = groups.lookup({
    'groupKey.id': email,
    'groupKey.namespace': ''  // Optional for google groups, dynamic groups, and security groups
                              // Necessary for identity-mapped groups (see https://developers.google.com/cloud-search/docs/guides/identity-mapping)
  }).name;

  // Retrieve the group resource
  return groups.get(groupName);
}

getGroups

The following helper method returns a list of Membership Resources. Access the group field of an element to find its name ID. This is useful for many methods of CIG Advanced Service. Similarly, access groupKey.id of an element to find its email.

/**
 * Retrieves all the membership relation resources to groups which you are a
 * direct member (or a pending member).
 *
 * @return {Array<MembershipRelation>} groups : List of direct memberships where
 * you are the member.
 */
function groupsAppGetGroups() {
  const myEmail = Session.getActiveUser().getEmail();
  let pageToken = '';
  let membershipList = [];

  do {
    const queryParams = {
      query:`member_key_id=='${myEmail}'`,
      pageToken:pageToken
    };
    const searchResult = groups.Memberships.searchDirectGroups('groups/-', queryParams);
    membershipList = membershipList.concat(searchResult.memberships);
    pageToken = searchResult.nextPageToken;
  } while (pageToken);

  return membershipList;
}

Group Methods

The following helper methods correspond to those of the Groups Service Groups Class.

getEmail

/**
 * Gets a group's email address
 *
 * @param {Object} group: A group resource
 * @return {String} email: The email associated with the group resource.
 */
function getEmail(group) {
  return group.groupKey.id;
}

getGroups

The following method uses Memberships.list, which will fetch every membership to the given group. This can include memberships of users as well as groups.

To better approximate the Groups Service getGroups method, we can filter memberships by their Type. We get access to this field by either providing a FULL View as a query parameter to Memberships.list or by performing an individual Memberships.lookup for each given membership.

/**
 * Fetch a list of memberships with provided group as its parent
 *
 * @param {Group} group: A group resource
 * @return {Array<Membership>} membershipList: The memberships where the parent
 * is the provided group and member is a also a group.
 */
function getGroups(group) {
  let membershipList = [];
  let pageToken = '';

  do {
    // Fetch a page of memberships
    const queryParams = {
      view: 'FULL',
      pageToken: pageToken
    }
    const response = groups.Memberships.list(group.name, queryParams);

    // Filter non-group memberships
    const onlyGroupMemberships = response.memberships.filter(
      membership => membership.type == 'GROUP'
    );
    membershipList = membershipList.concat(onlyGroupMemberships);

    // Set up next page
    pageToken = response.nextPageToken;
  } while(pageToken);

  return membershipList;
}

getRole and getRoles

While Groups Service might have only returned the highest priority role in getRole(), the roles field in a membership resource contains a separate element for each role the member qualifies for (example: MEMBER, OWNER, ADMIN).

/**
 * Retrieve the membership roles of a member to a group.
 *
 * @param {Group} containingGroup: The group whom the member belongs to
 * @param {String} email: The email address associated with a member that
 * belongs to the containingGroup
 * @return {Array<Role>} roles: List of roles the member holds with respect to
 * the containingGroup.
 */
function getRoleWithEmail(containingGroup, email) {
  // First fetch the membership
  const membershipName = groups.Memberships.lookup(containingGroup.name, { 'memberKey.id': email }).name;
  const membership = groups.Memberships.get(membershipName);

  // Then retrieve the role
  return membership.roles;
}

/**
 * Retrieve the membership roles of a member to a group.
 *
 * @param {Group} containingGroup: The group resource whom the member belongs to
 * @param {User} user: The user associated with a member that belongs to the
 * containingGroup
 * @return {Array<Role>} roles: List of roles the member holds with respect to
 * the containingGroup
 */
function getRoleWithUser(containingGroup, user) {
  return getRoleWithEmail(containingGroup, user.getEmail());
}

/**
 * Retrieve the membership roles of a group of members to a group
 *
 * @param {Group} containingGroup: The group resource to which roles are
 * relevant
 * @param {Array<User>} users: List of users to fetch roles from
 * @return {Array<Array<Role>>} roles: A list where every element is a list of
 * roles of member to the containingGroup
 */
function getRoles(containingGroup, users) {
  let roles = [];
  for (const user of users) {
    roles.push(getRoleWithUser(containingGroup, user));
  }
  return roles;
}

getUsers

Similarly to our approach in getGroups, we can fetch a group's memberships with Memberships.list and filter the results to only keep our target Type.

/**
 * Given a group, retrieve its direct members and banned members of the group
 * that have a known corresponding Google Account.
 *
 * @param {Group} group: The group Resource whom the users being queried belong
 * to
 * @return {Array<String>} users: A list of emails associated with members of
 * the given group
 */
function getUsers(group) {
  let userList = [];
  let pageToken = '';

  do {
    // Fetch a page of memberships from the group
    const queryParams = {
      view: 'FULL',
      pageToken: pageToken
    }
    const listResponse = groups.Memberships.list(group.name, queryParams);

    // Filter non-users and keep member emails
    const users = listResponse.memberships
      .filter(membership => membership.type == 'USER')
      .map(membership => membership.preferredMemberKey.id);
    userList = userList.concat(users);

    // Prepare next page
    pageToken = listResponse.nextPageToken;
  } while (pageToken);

  return userList;
}

hasGroup and hasUser

Both Groups Service hasGroup and hasUser confirm whether an entity is a member to a given group. Given that both a Group and a User can be represented by an email address, the following method can be used to confirm whether either belongs to a given group.

/**
 * Tests if the given email has an associated direct member to the given group.
 *
 * @param {Group} group: Group resource to which the entity is being checked as
 * a member
 * @param {String} email: Email that can represent a Group or User entity
 * @return {Boolean} isMember: Whether the entity is a direct member to the
 * group or not
 */
function checkDirectGroupMembership(group, email) {
  try {
    groups.Memberships.lookup(group.name, {'memberKey.id': email});

  } catch(e) {
    // Log failure if exception is not related to membership existence
    if (!e.message.includes('Membership does not exist.')) {
      console.error(e);
    }
    return false;
  }
  return true;
}