Comment 1 for bug 1199197

It looks like there was existing validation for the host in MySQLUser (See https://github.com/openstack/trove/blob/master/trove/guestagent/db/models.py#L350)

I imagine that once the regexps in trove/common/apischema.py are fixed for password + host + user, that is_valid + is_valid_user + is_valid_host_name are semi-redundant.

If you want to take it a step further, you could also take a look at MySQLDatabase and fix the inconsistencies there (ex: name has a check for > 64 chars, yet apischema.py permits 255, charset checks, etc.)