전역 구조 리팩터링 및 테스트 확장

lib/core/permissions/permission_manager.dart

@@ -0,0 +1,87 @@
+import 'package:flutter/widgets.dart';
+
+import '../config/environment.dart';
+
+enum PermissionAction { view, create, edit, delete, restore, approve }
+
+class PermissionManager extends ChangeNotifier {
+  PermissionManager({Map<String, Set<PermissionAction>>? overrides}) {
+    if (overrides != null) {
+      _overrides.addAll(overrides);
+    }
+  }
+
+  final Map<String, Set<PermissionAction>> _overrides = {};
+
+  bool can(String resource, PermissionAction action) {
+    final override = _overrides[resource];
+    if (override != null) {
+      if (override.contains(PermissionAction.view) &&
+          action == PermissionAction.view) {
+        return true;
+      }
+      return override.contains(action);
+    }
+    return Environment.hasPermission(resource, action.name);
+  }
+
+  void updateOverrides(Map<String, Set<PermissionAction>> overrides) {
+    _overrides
+      ..clear()
+      ..addAll(overrides);
+    notifyListeners();
+  }
+}
+
+class PermissionScope extends InheritedNotifier<PermissionManager> {
+  const PermissionScope({
+    super.key,
+    required PermissionManager manager,
+    required super.child,
+  }) : super(notifier: manager);
+
+  static PermissionManager of(BuildContext context) {
+    final scope = context.dependOnInheritedWidgetOfExactType<PermissionScope>();
+    assert(
+      scope != null,
+      'PermissionScope.of() called with no PermissionScope ancestor.',
+    );
+    return scope!.notifier!;
+  }
+}
+
+class PermissionGate extends StatelessWidget {
+  const PermissionGate({
+    super.key,
+    required this.resource,
+    required this.action,
+    required this.child,
+    this.fallback,
+    this.hide = true,
+  });
+
+  final String resource;
+  final PermissionAction action;
+  final Widget child;
+  final Widget? fallback;
+  final bool hide;
+
+  @override
+  Widget build(BuildContext context) {
+    final allowed = PermissionScope.of(context).can(resource, action);
+    if (allowed) {
+      return child;
+    }
+    if (hide) {
+      return fallback ?? const SizedBox.shrink();
+    }
+    return IgnorePointer(
+      ignoring: true,
+      child: Opacity(opacity: 0.4, child: fallback ?? child),
+    );
+  }
+}
+
+extension PermissionActionKey on PermissionAction {
+  String get key => name;
+}