func samlMetadata(w http.ResponseWriter, r *http.Request) error {
	if app.AuthScheme.Name() != "saml" {
		return &errors.HTTP{
			Code:    http.StatusBadRequest,
			Message: "This URL is only supported with saml enabled",
		}
	}
	page, err := saml.Metadata()
	if err != nil {
		return err
	}
	w.Header().Set("Content-Type", "application/xml")
	w.Write([]byte(page))
	return nil
}
func samlMetadata(w http.ResponseWriter, r *http.Request) error {
	if app.AuthScheme.Name() != "saml" {
		return &errors.HTTP{
			Code:    http.StatusBadRequest,
			Message: "This URL is only supported with saml enabled",
		}
	}
	page, err := saml.Metadata()
	if err != nil {
		return err
	}
	w.Header().Set("Content-Type", "application/xml")
	w.Write([]byte(page))
	return nil
}
// title: saml metadata
// path: /auth/saml
// method: GET
// produce: application/xml
// responses:
//   200: Ok
//   400: Invalid data