feat(setting): Implemented the settings administrative menu

lib/config/override_store.go

@@ -0,0 +1,68 @@
+package config
+
+import (
+	"encoding/json"
+	"os"
+	"path/filepath"
+	"sort"
+	"time"
+)
+
+const AdminSettingsOverrideFilename = "admin_settings_overrides.json"
+
+type adminSettingsOverrideFile struct {
+	Format    string            `json:"format"`
+	SavedAt   string            `json:"saved_at"`
+	Overrides map[string]string `json:"overrides"`
+}
+
+func ReadAdminSettingsOverrides(path string) (map[string]string, error) {
+	data, err := os.ReadFile(path)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return map[string]string{}, nil
+		}
+		return nil, err
+	}
+
+	var payload adminSettingsOverrideFile
+	if err := json.Unmarshal(data, &payload); err != nil {
+		return nil, err
+	}
+	if payload.Overrides == nil {
+		return map[string]string{}, nil
+	}
+	return payload.Overrides, nil
+}
+
+func WriteAdminSettingsOverrides(path string, overrides map[string]string) error {
+	if overrides == nil {
+		overrides = map[string]string{}
+	}
+
+	keys := make([]string, 0, len(overrides))
+	for key := range overrides {
+		keys = append(keys, key)
+	}
+	sort.Strings(keys)
+
+	normalized := make(map[string]string, len(overrides))
+	for _, key := range keys {
+		normalized[key] = overrides[key]
+	}
+
+	payload := adminSettingsOverrideFile{
+		Format:    "warpbox.admin.settings.overrides.v1",
+		SavedAt:   time.Now().UTC().Format(time.RFC3339),
+		Overrides: normalized,
+	}
+	data, err := json.MarshalIndent(payload, "", "  ")
+	if err != nil {
+		return err
+	}
+
+	if err := os.MkdirAll(filepath.Dir(path), 0755); err != nil {
+		return err
+	}
+	return os.WriteFile(path, data, 0644)
+}