Files
gonic/server/ids/ids.go
2020-06-06 18:13:45 +01:00

60 lines
1.1 KiB
Go

package ids
// 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 (
"errors"
"fmt"
"strconv"
"strings"
)
var (
ErrBadSeparator = errors.New("bad separator")
ErrNotAnInt = errors.New("not an int")
ErrBadPrefix = errors.New("bad prefix")
)
type ID string
const (
// type values copied from subsonic
Artist ID = "ar"
Album ID = "al"
Track ID = "tr"
)
var accepted = []ID{Artist,
Album,
Track,
}
type IDV struct {
Type ID
Value int
}
func (i IDV) String() string {
return fmt.Sprintf("%s-%d", i.Type, i.Value)
}
func Parse(in string) (IDV, error) {
parts := strings.Split(in, "-")
if len(parts) != 2 {
return IDV{}, ErrBadSeparator
}
partType := parts[0]
partValue := parts[1]
val, err := strconv.Atoi(partValue)
if err != nil {
return IDV{}, fmt.Errorf("%q: %w", partValue, ErrNotAnInt)
}
for _, acc := range accepted {
if partType == string(acc) {
return IDV{Type: acc, Value: val}, nil
}
}
return IDV{}, fmt.Errorf("%q: %w", partType, ErrBadPrefix)
}