refactor: move lib/policy/config to lib/config

Signed-off-by: Xe Iaso <me@xeiaso.net>

lib/config/store.go

@@ -0,0 +1,44 @@
+package config
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+
+	"github.com/TecharoHQ/anubis/lib/store"
+	_ "github.com/TecharoHQ/anubis/lib/store/all"
+)
+
+var (
+	ErrNoStoreBackend      = errors.New("config.Store: no backend defined")
+	ErrUnknownStoreBackend = errors.New("config.Store: unknown backend")
+)
+
+type Store struct {
+	Backend    string          `json:"backend"`
+	Parameters json.RawMessage `json:"parameters"`
+}
+
+func (s *Store) Valid() error {
+	var errs []error
+
+	if len(s.Backend) == 0 {
+		errs = append(errs, ErrNoStoreBackend)
+	}
+
+	fac, ok := store.Get(s.Backend)
+	switch ok {
+	case true:
+		if err := fac.Valid(s.Parameters); err != nil {
+			errs = append(errs, err)
+		}
+	case false:
+		errs = append(errs, fmt.Errorf("%w: %q", ErrUnknownStoreBackend, s.Backend))
+	}
+
+	if len(errs) != 0 {
+		return errors.Join(errs...)
+	}
+
+	return nil
+}