Move artwork id encoding to public package

server/public/encode_artwork_id.go

@@ -0,0 +1,38 @@
+package public
+
+import (
+	"context"
+	"errors"
+
+	"github.com/lestrrat-go/jwx/v2/jwt"
+	"github.com/navidrome/navidrome/core/auth"
+	"github.com/navidrome/navidrome/model"
+)
+
+func EncodeArtworkID(artID model.ArtworkID) string {
+	token, _ := auth.CreatePublicToken(map[string]any{"id": artID.String()})
+	return token
+}
+
+func DecodeArtworkID(tokenString string) (model.ArtworkID, error) {
+	token, err := auth.TokenAuth.Decode(tokenString)
+	if err != nil {
+		return model.ArtworkID{}, err
+	}
+	if token == nil {
+		return model.ArtworkID{}, errors.New("unauthorized")
+	}
+	err = jwt.Validate(token, jwt.WithRequiredClaim("id"))
+	if err != nil {
+		return model.ArtworkID{}, err
+	}
+	claims, err := token.AsMap(context.Background())
+	if err != nil {
+		return model.ArtworkID{}, err
+	}
+	id, ok := claims["id"].(string)
+	if !ok {
+		return model.ArtworkID{}, errors.New("invalid id type")
+	}
+	return model.ParseArtworkID(id)
+}