func determineBestClient(
options identity.AuthOptions,
client client.AuthenticatingClient,
cred identity.Credentials,
newClient func(*identity.Credentials, identity.AuthMode, *log.Logger) client.AuthenticatingClient,
) client.AuthenticatingClient {
for _, option := range options {
if option.Mode != identity.AuthUserPassV3 {
continue
}
cred.URL = option.Endpoint
v3client := newClient(&cred, identity.AuthUserPassV3, nil)
// V3 being advertised is not necessaritly a guarantee that it will
// work.
err := v3client.Authenticate()
if err == nil {
return v3client
}
}
return client
}
