def is_accepted():
    '''
    If license was accepted, returns timestamp when license was accepted.
    If license was never accepted so far, returns None.
    If license was rejected, returns False.
    '''
    return store.load('accepted', default=None)

def accept(force=False):
    '''
    Prints the license.
    Allows users to accept the license by prompting.
    If force=True is passed, accepts the license with no prompt.
    If no stdin is available, e.g. when running as a service, accept license with no prompt.
    '''
    if is_accepted():
        return
    gramex.console(EULA)
    result = 'y' if force or not sys.stdin else ''
    while not result:
        result = input('Do you accept the license (Y/N): ').strip()
    if result.lower().startswith('y'):
        store.dump('accepted', time.time())
        store.flush()
        gramex.console('Gramex license accepted')
    else:
        raise RuntimeError('Gramex license not accepted')

def reject():
    '''
    Rejects the license.
    '''
    store.dump('accepted', False)
    store.flush()
    gramex.console('Gramex license rejected')