code: func NewCertGeneratorHandlerFromSigner(validator Validator, signer signer.Signer) http.Handler {
  	return api.HTTPHandler{
  		Handler: &CertGeneratorHandler{
  			generator: &csr.Generator{Validator: validator},
  			signer:    signer,
  		},
  		Methods: []string{"POST"},
  	}
  }
docs: // NewCertGeneratorHandlerFromSigner returns a handler directly from
  // the signer and validation function.