const EXPIRY_TIME = '2014-05-01 23:42';

function autoExpire() {
  var id, asset, i, email, users;

  // The URL of the Google Drive file or folder
  var URL = 'https://drive.google.com/folderview?id=0B4fk8L6brI_ednJaa052';

  try {
    // Extract the File or Folder ID from the Drive URL
    var id = URL.match(/[-\\w]{25,}/);

    if (id) {
      asset = DriveApp.getFileById(id) ? DriveApp.getFileById(id) : DriveApp.getFolderById(id);

      if (asset) {
        // Make the folder / file Private
        asset.setSharing(DriveApp.Access.ANYONE, DriveApp.Permission.NONE);
        asset.setSharing(DriveApp.Access.ANYONE_WITH_LINK, DriveApp.Permission.NONE);

        // Remove all users who have edit permissions
        users = asset.getEditors();
        for (i in users) {
          email = users[i].getEmail();
          if (email != '') {
            asset.removeEditor(email);
          }
        }

        // Remove all users who have view permssions
        users = asset.getViewers();
        for (i in users) {
          email = users[i].getEmail();
          if (email != '') {
            asset.removeViewer(email);
          }
        }
      }
    }
  } catch (e) {
    Logger.log(e.toString());
  }
}

function Start() {
  var triggers = ScriptApp.getProjectTriggers();

  for (var i in triggers) {
    ScriptApp.deleteTrigger(triggers[i]);
  }

  var time = EXPIRY_TIME;

  // Run the auto-expiry script at this date and time

  var expireAt = new Date(
    time.substr(0, 4),
    time.substr(5, 2) - 1,
    time.substr(8, 2),
    time.substr(11, 2),
    time.substr(14, 2)
  );

  if (!isNaN(expireAt.getTime())) {
    ScriptApp.newTrigger('autoExpire').timeBased().at(expireAt).create();
  }
}