"""Utils for salessheets logic."""
from salessheets.constants import header


def is_workstation_user(user_id=None):
    """Check whether the call was performed on behalf of workstation user.

    Args:
        user_id (str): user id from request header.

    Return:
        Boolean: True if call was performed on behalf of workstation user,
            False in all other cases.
    """
    if user_id:
        return user_id.startswith(header.WORKSTATION_USER_PREFIX)
    return False