manage-permissions

Permissions & RBAC Management Skill

This skill defines the process for extending the RBAC (role-based access control) model and gating routes or UI by capability. See ADR-0014 for the full design rationale — this skill only covers the mechanics.

1. The Model

• UserRole (lib/src/infrastructure/auth/models/user_role.dart): an enum of session roles (e.g. guest, standard).
• Permission (lib/src/infrastructure/auth/models/permission.dart): an enum of capabilities (e.g. settingsView, postsEdit). Routes and widgets declare a Permission, never a UserRole directly.
• kRolePermissions (lib/src/infrastructure/auth/models/role_permissions.dart): a single static Map<UserRole, Set<Permission>> — the one source of truth for what each role can do.
• AppState.permissions derives the current session's permission set from kRolePermissions; every consumer reads through this, never kRolePermissions directly.

2. Step 1 — Add a New Permission

Add a member to the Permission enum:

enum Permission {
  settingsView,
  postsEdit,
  // ...
  reportsView,
}

3. Step 2 — Grant It to a Role

Update kRolePermissions:

const kRolePermissions = <UserRole, Set<Permission>>{
  UserRole.guest: {},
  UserRole.standard: {
    Permission.settingsView,
    Permission.postsEdit,
    Permission.reportsView,
  },
};

4. Step 3 — Gate a Route

Pass requiredPermission on the route's _AppRoute definition (see manage-routes for the general route-adding process):

final class _ReportsRoute extends _AppRoute {
  const _ReportsRoute()
      : super(
          path: '/reports',
          name: 'reports',
          requiredPermission: Permission.reportsView,
        );

  @override
  Widget build(_, _) => const ReportsPage();
}

PermissionGuard (a RouteGuard, priority 40) enforces this automatically at navigation time — no further wiring needed.

5. Step 4 — Gate In-Place UI

For a widget that isn't a full route (e.g. hiding a button rather than blocking navigation), use PermissionGate or the PermissionCheck extension (lib/src/shared/permission_gate.dart):