func configureAuth(s *server.Server, opts *server.Options) {
if opts.Username != "" {
auth := &auth.Plain{
Username: opts.Username,
Password: opts.Password,
}
s.SetAuthMethod(auth)
} else if opts.Authorization != "" {
auth := &auth.Token{
Token: opts.Authorization,
}
s.SetAuthMethod(auth)
}
}
