code: def user(username, password, all):
      
      if current_app.config['AUTH_PROVIDER'] != 'basic':
          raise click.UsageError('Not required for {} admin users'.format(current_app.config['AUTH_PROVIDER']))
      if username and username not in current_app.config['ADMIN_USERS']:
          raise click.UsageError('User {} not an admin'.format(username))
      if not username and not all:
          raise click.UsageError('Missing option "--username".')
  
      def create_user(admin):
          email = admin if '@' in admin else None
          user = User(
              name='Admin user',
              login=admin,
              password=generate_password_hash(password),
              roles=['admin'],
              text='Created by alertad script',
              email=email,
              email_verified=bool(email)
          )
          try:
              db.get_db()  # init db on global app context
              user = user.create()
          except Exception as e:
              click.echo('ERROR: {}'.format(e))
          else:
              click.echo('{} {}'.format(user.id, user.name))
  
      if all:
          for admin in current_app.config['ADMIN_USERS']:
              create_user(admin)
      else:
          create_user(username)
docs: Create admin users (BasicAuth only).