package attributes import ( "errors" "fmt" "strings" "github.com/nspcc-dev/neofs-sdk-go/netmap" ) const keyValueSeparator = ":" // ReadNodeAttributes parses node attributes from list of string in "Key:Value" format // and writes them into netmap.NodeInfo instance. Supports escaped symbols // "\:", "\/" and "\\". func ReadNodeAttributes(dst *netmap.NodeInfo, attrs []string) error { cache := make(map[string]struct{}, len(attrs)) for i := range attrs { line := replaceEscaping(attrs[i], false) // replaced escaped symbols with non-printable symbols words := strings.Split(line, keyValueSeparator) if len(words) != 2 { return errors.New("missing attribute key and/or value") } _, ok := cache[words[0]] if ok { return fmt.Errorf("duplicated keys %s", words[0]) } cache[words[0]] = struct{}{} // replace non-printable symbols with escaped symbols without escape character words[0] = replaceEscaping(words[0], true) words[1] = replaceEscaping(words[1], true) fmt.Println(words[0], words[1]) if words[0] == "" { return errors.New("empty key") } else if words[1] == "" { return errors.New("empty value") } dst.SetAttribute(words[0], words[1]) } return nil } func replaceEscaping(target string, rollback bool) (s string) { const escChar = `\` var ( oldKVSep = escChar + keyValueSeparator oldEsc = escChar + escChar newKVSep = string(uint8(2)) newEsc = string(uint8(3)) ) if rollback { oldKVSep, oldEsc = newKVSep, newEsc newKVSep = keyValueSeparator newEsc = escChar } s = strings.ReplaceAll(target, oldEsc, newEsc) s = strings.ReplaceAll(s, oldKVSep, newKVSep) return }