gistfile1.go

tohash := []byte(p.host.id)
tohash = append(tohash, p.sharedsecret...)
tohash = append(tohash, p.host.keypacked...)
resp, err := http.Get(fmt.Sprintf("http://session.minecraft.net/game/checkserver.jsp?user=%v&serverId=%v", p.name, hash(tohash)))


func hash(data []byte) string {
  h := sha1.New()
	h.Write(data)
	hashed := h.Sum(nil)
	zeroes, err := regexp.Compile("^0+")
	if err != nil {
		fmt.Println(err)
	}
	negative := false

	if hashed[0]&0x08 == 0 { //two's complement
		negative = true
		carry := true
		for i := len(hashed) - 1; i >= 0; i-- {
			hashed[i] = ^hashed[i]
			if carry {
				carry = hashed[i] == 0xFF
				hashed[i]++
			}
		}
	}

	stringhash := fmt.Sprintf("%x", hashed)
	stringhash = zeroes.ReplaceAllLiteralString(stringhash, "")

	if negative {
		stringhash = "-" + stringhash
	}
	return stringhash
}