77 lines
1.5 KiB
Go
77 lines
1.5 KiB
Go
package specid
|
|
|
|
// this package is at such a high level in the hierarchy because
|
|
// it's used by both `server/db` (for now) and `server/ctrlsubsonic`
|
|
|
|
import (
|
|
"encoding/json"
|
|
"errors"
|
|
"fmt"
|
|
"strconv"
|
|
"strings"
|
|
)
|
|
|
|
var (
|
|
ErrBadSeparator = errors.New("bad separator")
|
|
ErrNotAnInt = errors.New("not an int")
|
|
ErrBadPrefix = errors.New("bad prefix")
|
|
)
|
|
|
|
type IDT string
|
|
|
|
const (
|
|
Artist IDT = "ar"
|
|
Album IDT = "al"
|
|
Track IDT = "tr"
|
|
Podcast IDT = "pd"
|
|
PodcastEpisode IDT = "pe"
|
|
separator = "-"
|
|
)
|
|
|
|
type ID struct {
|
|
Type IDT
|
|
Value int
|
|
}
|
|
|
|
func New(in string) (ID, error) {
|
|
parts := strings.Split(in, separator)
|
|
if len(parts) != 2 {
|
|
return ID{}, ErrBadSeparator
|
|
}
|
|
partType := parts[0]
|
|
partValue := parts[1]
|
|
val, err := strconv.Atoi(partValue)
|
|
if err != nil {
|
|
return ID{}, fmt.Errorf("%q: %w", partValue, ErrNotAnInt)
|
|
}
|
|
switch IDT(partType) {
|
|
case Artist:
|
|
return ID{Type: Artist, Value: val}, nil
|
|
case Album:
|
|
return ID{Type: Album, Value: val}, nil
|
|
case Track:
|
|
return ID{Type: Track, Value: val}, nil
|
|
case Podcast:
|
|
return ID{Type: Podcast, Value: val}, nil
|
|
case PodcastEpisode:
|
|
return ID{Type: PodcastEpisode, Value: val}, nil
|
|
default:
|
|
return ID{}, fmt.Errorf("%q: %w", partType, ErrBadPrefix)
|
|
}
|
|
}
|
|
|
|
func (i ID) String() string {
|
|
if i.Value == 0 {
|
|
return "-1"
|
|
}
|
|
return fmt.Sprintf("%s%s%d", i.Type, separator, i.Value)
|
|
}
|
|
|
|
func (i ID) MarshalJSON() ([]byte, error) {
|
|
return json.Marshal(i.String())
|
|
}
|
|
|
|
func (i ID) MarshalText() ([]byte, error) {
|
|
return []byte(i.String()), nil
|
|
}
|