Is there a way to tell if an email address corresponds to a Google account?

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I am working on a Google Sheets add-on that calls Permissions: insert as described in a Stack Overflow answer:

function addUserPermission(fileId, email, notify) {
  Drive.Permissions.insert({
    'value': email,
    'type': 'user',
    'role': 'reader',
    'withLink': false
  },
    fileId,
    {
      'sendNotificationEmails': notify
    });
}

The notify flag is true if the user should receive an email notification of the added permission, false if they should not.

If the email value is associated with a Google account (such as foo@gmail.com), this works whether notify is true or false. If the email value is not associated with a Google account, an exception is thrown if notify is false:

ScriptError: GoogleJsonResponseException: API call to drive.permissions.insert failed with error: Bad Request. User message: "You are trying to invite fakeaddress@nowhere.com. Since there is no Google account associated with this email address, you must check the "Notify people" box to invite this recipient."

Is there any way to tell before calling Drive.permissions.insert that the email address is not associated with a Google account?

google-drive-api google-apps-script
1 Answers

This is only possible for Admin Users

If you are an admin for your Google Workspace, you may use AdminDirectory.Users.get("userEmail") to check whether the google account (under your google workspace) exists or not. You may use the following script as the base for your code:

function getUser(userEmail) {
  try {
    const user = AdminDirectory.Users.get(userEmail);
    Logger.log("Email exists");
  } catch (err) {
    Logger.log('Email does not exist. Error: %s', err.message);
  }
}

NOTE: This script only works if:

  1. You are an administrator in your Google Workspace.
  2. The google account is registered under your Google Workspace.
  3. AdminDirectory service is added to the Apps Script project.

Reference

For further details, you may read the following:

  1. Admin SDK Directory Service/Get User
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