// TODO: check user agent only contains *git* can access info/refs|git-upload-pack|git-receive-pack
// TODO: git protocol version 2 support
// TODO: gzip support
package main

import (
	"fmt"
	"net/http"
)

func operationIsForbidden(w *http.ResponseWriter, service string) (b bool) {
	if service != "git-upload-pack" && service != "git-receive-pack" {
		statusCodeWithMessage(w, 403, "Operation not permitted")
		return true
	}
	return false
}

func statusCodeWithMessage(w *http.ResponseWriter, code int, message string) {
	(*w).WriteHeader(code)
	_, _ = (*w).Write([]byte(message))
}

func handleRefsHeader(w *http.ResponseWriter, service string) {
	cType := fmt.Sprintf("application/x-%s-advertisement", service)
	(*w).Header().Add("Content-Type", cType)
	(*w).Header().Set("Expires", "Fri, 01 Jan 1980 00:00:00 GMT")
	(*w).Header().Set("Pragma", "no-cache")
	(*w).Header().Set("Cache-Control", "no-cache, max-age=0, must-revalidate")
}

func handlePackHeader(w *http.ResponseWriter, service string) {
	(*w).Header().Set("Content-Type", fmt.Sprintf("application/x-%s-result", service))
	(*w).Header().Set("Connection", "Keep-Alive")
	(*w).Header().Set("Transfer-Encoding", "chunked")
	(*w).Header().Set("X-Content-Type-Options", "nosniff")
}