replace some of the Nginx configuration to Lua code

internal/ingress/controller/template/template.go

@@ -132,6 +132,8 @@ var (
 		"buildRateLimitZones":        buildRateLimitZones,
 		"buildRateLimit":             buildRateLimit,
 		"buildResolversForLua":       buildResolversForLua,
+		"configForLua":               configForLua,
+		"locationConfigForLua":       locationConfigForLua,
 		"buildResolvers":             buildResolvers,
 		"buildUpstreamName":          buildUpstreamName,
 		"isLocationInLocationList":   isLocationInLocationList,
@@ -263,6 +265,51 @@ func buildResolversForLua(res interface{}, disableIpv6 interface{}) string {
 	return strings.Join(r, ", ")
 }
 
+// configForLua returns some general configuration as Lua table represented as string
+func configForLua(input interface{}) string {
+	all, ok := input.(config.TemplateConfig)
+	if !ok {
+		klog.Errorf("expected a 'config.TemplateConfig' type but %T was given", input)
+		return "{}"
+	}
+
+	return fmt.Sprintf(`{
+		use_forwarded_headers = %t,
+		is_ssl_passthrough_enabled = %t,
+		http_redirect_code = %v,
+		listen_ports = { ssl_proxy = "%v", https = "%v" },
+	}`, all.Cfg.UseForwardedHeaders, all.IsSSLPassthroughEnabled, all.Cfg.HTTPRedirectCode, all.ListenPorts.SSLProxy, all.ListenPorts.HTTPS)
+}
+
+// locationConfigForLua formats some location specific configuration into Lua table represented as string
+func locationConfigForLua(l interface{}, s interface{}, a interface{}) string {
+	location, ok := l.(*ingress.Location)
+	if !ok {
+		klog.Errorf("expected an '*ingress.Location' type but %T was given", l)
+		return "{}"
+	}
+
+	server, ok := s.(*ingress.Server)
+	if !ok {
+		klog.Errorf("expected an '*ingress.Server' type but %T was given", s)
+		return "{}"
+	}
+
+	all, ok := a.(config.TemplateConfig)
+	if !ok {
+		klog.Errorf("expected a 'config.TemplateConfig' type but %T was given", a)
+		return "{}"
+	}
+
+	forceSSLRedirect := location.Rewrite.ForceSSLRedirect || (len(server.SSLCert.PemFileName) > 0 && location.Rewrite.SSLRedirect)
+	forceSSLRedirect = forceSSLRedirect && !isLocationInLocationList(l, all.Cfg.NoTLSRedirectLocations)
+
+	return fmt.Sprintf(`{
+		force_ssl_redirect = %t,
+		use_port_in_redirects = %t,
+	}`, forceSSLRedirect, location.UsePortInRedirects)
+}
+
 // buildResolvers returns the resolvers reading the /etc/resolv.conf file
 func buildResolvers(res interface{}, disableIpv6 interface{}) string {
 	// NGINX need IPV6 addresses to be surrounded by brackets