Base webui and backend additions

service/internal/settings/settings.go

@@ -0,0 +1,42 @@
+package settings
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+)
+
+// LoadSettings reads and parses settings.json from dir.
+func LoadSettings(dir string) (Settings, error) {
+	path := filepath.Join(dir, SettingsFileName)
+	payload, err := os.ReadFile(path)
+	if err != nil {
+		return Settings{}, fmt.Errorf("read settings: %w", err)
+	}
+
+	var settings Settings
+	if err := json.Unmarshal(payload, &settings); err != nil {
+		return Settings{}, fmt.Errorf("parse settings: %w", err)
+	}
+	return settings, nil
+}
+
+// SaveSettings writes settings.json to dir with mode 0640.
+func SaveSettings(dir string, settings Settings) error {
+	if err := ensureConfigDir(dir); err != nil {
+		return err
+	}
+
+	payload, err := json.MarshalIndent(settings, "", "  ")
+	if err != nil {
+		return fmt.Errorf("encode settings: %w", err)
+	}
+	payload = append(payload, '\n')
+
+	path := filepath.Join(dir, SettingsFileName)
+	if err := os.WriteFile(path, payload, 0o640); err != nil {
+		return fmt.Errorf("write settings: %w", err)
+	}
+	return nil
+}