package storage

import "database/sql"

const BrowserMarkerLength = 32

func ValidBrowser(s string) bool {
	if len(s) != BrowserMarkerLength {
		return false
	}
	for i := 0; i < len(s); i++ {
		c := s[i]
		if (c < '0' || c > '9') && (c < 'a' || c > 'f') {
			return false
		}
	}
	return true
}

func nullString(s string) sql.NullString {
	return sql.NullString{String: s, Valid: s != ""}
}