Vueドキュメントにおける権限制御機能の実装方法

function checkPermission(user, permission) {
  return user.permissions.indexOf(permission) !== -1;
}

const router = new VueRouter({
  routes: [
    {
      path: '/dashboard',
      component: Dashboard,
      meta: {
        requiresAuth: true,
        requiresPermission: 'dashboard:view'
      }
    },
    {
      path: '/login',
      component: Login
    }
  ]
});

router.beforeEach((to, from, next) => {
  // check if the route requires authentication
  if (to.matched.some(record => record.meta.requiresAuth)) {
    // check if the user is authenticated
    if (!auth.isAuthenticated()) {
      // if not, redirect to login page
      next({
        path: '/login',
        query: { redirect: to.fullPath }
      });
    } else {
      // if the user is authenticated, check permissions
      const user = auth.getUser();
      if (to.matched.some(record => record.meta.requiresPermission)) {
        const permission = to.meta.requiresPermission;
        if (checkPermission(user, permission)) {
          // if the user has the permission, allow access
          next();
        } else {
          // if the user doesn't have the permission, deny access
          next({ path: '/not-authorized' });
        }
      } else {
        // if the route doesn't require any permissions, allow access
        next();
      }
    }
  } else {
    // if the route doesn't require authentication, allow access
    next();
  }
});