Google Script How do I getGivenName() of getActiveUser()

Question

Each user on the domain initiates a simple script we run for leave entitlements but we want the welcome message to be "Hi First Name," however the script doesn't seem to be able to fetch getGivenName() from getActiveUser() for a standard user.

Is there a way?

Answer 1

As noted in comments, and in Documentation, the UserManager Service is only accessible by Domain Administrators.

Here's an alternative. Domain Users may have themselves in their own contacts, so how about a best-effort attempt at finding themselves there?

/**
 * Get current user's name, by accessing their contacts.
 *
 * @returns {String} First name (GivenName) if available,
 *                   else FullName, or login ID (userName)
 *                   if record not found in contacts.
 */
function getOwnName(){
  var email = Session.getEffectiveUser().getEmail();
  var self = ContactsApp.getContact(email);

  // If user has themselves in their contacts, return their name
  if (self) {
    // Prefer given name, if that's available
    var name = self.getGivenName();
    // But we will settle for the full name
    if (!name) name = self.getFullName();
    return name;
  }
  // If they don't have themselves in Contacts, return the bald userName.
  else {
    var userName = Session.getEffectiveUser().getUsername();
    return userName;
  }
}