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lego/providers/dns/selfhostde/mapping.go
Ludovic Fernandez 20c8d6c413
Add DNS provider for SelfHost.(de|eu) (#2278)
Co-authored-by: Dominik Menke <git@dmke.org>
2024-09-20 13:46:38 +02:00

132 lines
1.9 KiB
Go

package selfhostde
import (
"errors"
"fmt"
"strings"
)
const (
lineSep = ","
recordSep = ":"
)
type Seq struct {
cursor int
ids []string
}
func NewSeq(ids ...string) *Seq {
return &Seq{ids: ids}
}
func (s *Seq) Next() string {
if len(s.ids) == 1 {
return s.ids[0]
}
v := s.ids[s.cursor]
if s.cursor < len(s.ids)-1 {
s.cursor++
} else {
s.cursor = 0
}
return v
}
func parseRecordsMapping(raw string) (map[string]*Seq, error) {
raw = strings.ReplaceAll(raw, " ", "")
if raw == "" {
return nil, errors.New("empty mapping")
}
acc := map[string]*Seq{}
for {
index, err := safeIndex(raw, lineSep)
if err != nil {
return nil, err
}
if index != -1 {
name, seq, err := parseLine(raw[:index])
if err != nil {
return nil, err
}
acc[name] = seq
// Data for the next iteration.
raw = raw[index+1:]
continue
}
name, seq, errP := parseLine(raw)
if errP != nil {
return nil, errP
}
acc[name] = seq
return acc, nil
}
}
func parseLine(line string) (string, *Seq, error) {
idx, err := safeIndex(line, recordSep)
if err != nil {
return "", nil, err
}
if idx == -1 {
return "", nil, fmt.Errorf("missing %q: %s", recordSep, line)
}
name, rawIDs := line[:idx], line[idx+1:]
var ids []string
var count int
for {
idx, err = safeIndex(rawIDs, recordSep)
if err != nil {
return "", nil, err
}
if count == 2 {
return "", nil, fmt.Errorf("too many record IDs for one domain: %s", line)
}
if idx != -1 {
ids = append(ids, rawIDs[:idx])
count++
// Data for the next iteration.
rawIDs = rawIDs[idx+1:]
continue
}
ids = append(ids, rawIDs)
return name, NewSeq(ids...), nil
}
}
func safeIndex(v, sep string) (int, error) {
index := strings.Index(v, sep)
if index == 0 {
return 0, fmt.Errorf("first char is %q: %s", sep, v)
}
if index == len(v)-1 {
return 0, fmt.Errorf("last char is %q: %s", sep, v)
}
return index, nil
}