generate certs files only when not existent

server/server.go

@@ -26,5 +26,8 @@ func (s *Server) ServeHttp(port uint) error {
 }
 
 func (s *Server) ServeHttps(port uint, cert cert.Cert) error {
+	if err := cert.GenerateSelfSignedCert(); err != nil {
+		return err
+	}
 	return s.Routes.RunTLS(fmt.Sprintf(":%d", port), cert.CertFile, cert.KeyFile)
 }