class Register(Master):
    """Register an InternalPrincipal add an IUser"""
    def update(self, login=None, password=None, password_repeat=None, fname=None, lname=None, email=None):
        # TODO: validate password is equal to password_repeat    
        # add principal to principal folder
        if login is not None:
            pau = component.getUtility(IAuthentication)
            principals = pau['principals']
            if login not in principals:
                name = fname + ' ' + lname
                principals[login] = user = InternalPrincipal(login, password, name)
                # save the email to an IUser instance
                user = IUser(user) #pass it the InternalPrincipal object for adaption
                user.email = email 
                user.fname = fname
                user.lname = lname
                principalRoleManager.assignRoleToPrincipal('Tpi.Employee', login)
            else:pass
        else:pass