def _validate_username_doesnt_exist(username):
"""Validate that the username is not associated with an existing user.
:param username: The proposed username (unicode).
:return: None
:raises: errors.AccountUsernameAlreadyExists
"""
if username is not None and username_exists_or_retired(username):
raise errors.AccountUsernameAlreadyExists(_(accounts.USERNAME_CONFLICT_MSG).format(username=username))
def _validate_username_doesnt_exist(username, api_version='v1'):
"""Validate that the username is not associated with an existing user.
:param username: The proposed username (unicode).
:param api_version: Validation API version; it is used to determine the error message
:return: None
:raises: errors.AccountUsernameAlreadyExists
"""
if api_version == 'v1':
error_message = accounts.USERNAME_CONFLICT_MSG.format(username=username)
else:
error_message = accounts.AUTHN_USERNAME_CONFLICT_MSG
if username is not None and username_exists_or_retired(username):
raise errors.AccountUsernameAlreadyExists(_(error_message)) # lint-amnesty, pylint: disable=translation-of-non-string
