package util

import (
	"fmt"
	"net/http"
	"net/url"
)

func MakeURL(r *http.Request, path string, subs ...interface{}) *url.URL {
	scheme := "https"
	if r.TLS == nil {
		scheme = "http"
	}

	// Always defer to whatever the proxy told us it was doing because this
	// could be a mullet-VIP in either direction.
	if fwProto := r.Header.Get("X-Forwarded-Proto"); fwProto != "" {
		scheme = fwProto
	}

	return &url.URL{
		Scheme: scheme,
		Host:   r.Host,
		Path:   fmt.Sprintf(path, subs...),
	}
}