feat: v2 (#599)

Read https://github.com/filebrowser/filebrowser/pull/575.

auth/storage.go

@@ -0,0 +1,39 @@
+package auth
+
+import (
+	"github.com/filebrowser/filebrowser/v2/settings"
+	"github.com/filebrowser/filebrowser/v2/users"
+)
+
+// StorageBackend is a storage backend for auth storage.
+type StorageBackend interface {
+	Get(settings.AuthMethod) (Auther, error)
+	Save(Auther) error
+}
+
+// Storage is a auth storage.
+type Storage struct {
+	back  StorageBackend
+	users *users.Storage
+}
+
+// NewStorage creates a auth storage from a backend.
+func NewStorage(back StorageBackend, users *users.Storage) *Storage {
+	return &Storage{back: back, users: users}
+}
+
+// Get wraps a StorageBackend.Get and calls SetStorage on the auther.
+func (s *Storage) Get(t settings.AuthMethod) (Auther, error) {
+	auther, err := s.back.Get(t)
+	if err != nil {
+		return nil, err
+	}
+
+	auther.SetStorage(s.users)
+	return auther, nil
+}
+
+// Save wraps a StorageBackend.Save.
+func (s *Storage) Save(a Auther) error {
+	return s.back.Save(a)
+}