yatwiki/AuthorHash.go

package yatwiki3

import (
	"crypto/md5"
	"encoding/hex"
	"net/http"
	"strings"
)

func RemoteAddrToIPAddress(remoteAddr string) string {
	return strings.TrimRight(strings.TrimRight(remoteAddr, `0123456789`), `:`) // trim trailing port; IPv4 and IPv6-safe
}

func Author(r *http.Request) string {
	userAgentHash := md5.Sum([]byte(r.UserAgent()))

	return RemoteAddrToIPAddress(r.RemoteAddr) + "-" + hex.EncodeToString(userAgentHash[:])[:6]
}