feat: add media store and store medias

backend/common/media_store/store.go

@@ -0,0 +1,80 @@
+package media_store
+
+import (
+	"encoding/json"
+	"os"
+	"path/filepath"
+
+	"github.com/pkg/errors"
+	log "github.com/sirupsen/logrus"
+)
+
+type Store []UUIDMap
+
+type UUIDMap struct {
+	UUID string
+	Name string
+}
+
+func NewStore(path string) (*Store, error) {
+	mapFile := filepath.Join(path, "map.json")
+	log.Infof("read in from: %s", mapFile)
+	if _, err := os.Stat(mapFile); err != nil {
+		if os.IsNotExist(err) {
+			if err := os.WriteFile(mapFile, []byte("[]"), os.ModePerm); err != nil {
+				return nil, errors.Wrapf(err, "write file: %s", mapFile)
+			}
+		}
+	}
+
+	b, err := os.ReadFile(mapFile)
+	if err != nil {
+		return nil, errors.Wrapf(err, "read file: %s", mapFile)
+	}
+
+	var store Store
+	err = json.Unmarshal(b, &store)
+	if err != nil {
+		return nil, errors.Wrapf(err, "unmarshal json: %s", mapFile)
+	}
+
+	return &store, nil
+}
+
+func (s *Store) Save(path string) error {
+	mapFile := filepath.Join(path, "map.json")
+	b, err := json.Marshal(s)
+	if err != nil {
+		return errors.Wrapf(err, "marshal json: %s", mapFile)
+	}
+
+	if err := os.WriteFile(mapFile, b, os.ModePerm); err != nil {
+		return errors.Wrapf(err, "write file: %s", mapFile)
+	}
+
+	return nil
+}
+
+func (s *Store) Add(uuid, name string) {
+	*s = append(*s, UUIDMap{UUID: uuid, Name: name})
+}
+
+func (s *Store) UUIDs() []string {
+	var uuids []string
+	for _, m := range *s {
+		uuids = append(uuids, m.UUID)
+	}
+
+	return uuids
+}
+
+// Exists
+func (s *Store) Exists(name string) bool {
+	for _, m := range *s {
+		if m.Name == name {
+			return true
+		}
+	}
+
+	return false
+}