class TicketError(Exception):
    """Base class for errors generated by the module"""
    def __init__(self, ticket, msg=''):
        self.ticket = ticket
        self.msg = msg

    def __str__(self):
        return 'Ticket error: {0}  ({1})'.format(self.msg, self.ticket)


class TicketParseError(TicketError):
    """Error parsing the ticket string"""
    def __init__(self, ticket, msg=''):
        super().__init__(ticket, msg)


class TicketDigestError(TicketError):
    """Exception raised when a tickets digest is incorrect"""
    def __init__(self, ticket):
        super().__init__(ticket, 'Invalid digest')


class TicketExpired(TicketError):
    """Exception raised when a ticket has expired"""
    def __init__(self, ticket):
        super().__init__(ticket, 'Ticket expired')