Base webui and backend additions

service/internal/settings/path.go

@@ -0,0 +1,64 @@
+package settings
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+const (
+	DefaultConfigDir = "/etc/ClusterCanvas"
+	ConfigDirEnvVar  = "CLUSTERCANVAS_CONFIG_DIR"
+	ConfigKeyEnvVar  = "CLUSTERCANVAS_CONFIG_KEY"
+
+	SettingsFileName = "settings.json"
+	SecretsFileName  = "secrets.enc"
+)
+
+// ResolveDir returns the config directory using precedence:
+// 1. flagValue (-configdir), if non-empty
+// 2. CLUSTERCANVAS_CONFIG_DIR, if set
+// 3. /etc/ClusterCanvas
+//
+// Leading ~/ is expanded to the user home directory.
+func ResolveDir(flagValue string) (string, error) {
+	candidate := strings.TrimSpace(flagValue)
+	if candidate == "" {
+		candidate = strings.TrimSpace(os.Getenv(ConfigDirEnvVar))
+	}
+	if candidate == "" {
+		candidate = DefaultConfigDir
+	}
+
+	expanded, err := expandHome(candidate)
+	if err != nil {
+		return "", err
+	}
+	return filepath.Clean(expanded), nil
+}
+
+func expandHome(path string) (string, error) {
+	if path == "~" {
+		homeDirectory, err := os.UserHomeDir()
+		if err != nil {
+			return "", fmt.Errorf("expand home directory: %w", err)
+		}
+		return homeDirectory, nil
+	}
+	if strings.HasPrefix(path, "~/") {
+		homeDirectory, err := os.UserHomeDir()
+		if err != nil {
+			return "", fmt.Errorf("expand home directory: %w", err)
+		}
+		return filepath.Join(homeDirectory, path[2:]), nil
+	}
+	return path, nil
+}
+
+func ensureConfigDir(dir string) error {
+	if err := os.MkdirAll(dir, 0o750); err != nil {
+		return fmt.Errorf("create config dir %q: %w", dir, err)
+	}
+	return nil
+}