How to secure routes using AngularJS_AngularJS

Introduction

AngularJS has been used for a long time since its emergence. It is a javascript framework for developing single page applications (SPA). It has some nice features like two-way binding, directives, etc. This article mainly introduces Angular routing security strategies. It is a client-side security framework that can be developed with Angular. I've tested it. In addition to ensuring client-side routing security, you also need to ensure server-side access security. Client security policies help reduce additional access to the server. However, if someone accesses the server by tricking the browser, server-side security policies should be able to deny unauthorized access. In this article, I will only discuss client-side security policies.

1 Define global variables at the application module level

Define roles for the application:

var roles = {
  superUser: 0,
  admin: 1,
  user: 2
};

Define routes for unauthorized access for applications:

var routeForUnauthorizedAccess = '/SomeAngularRouteForUnauthorizedAccess';

2 Define authorization service

appModule.factory('authorizationService', function ($resource, $q, $rootScope, $location) {
  return {
    // 将权限缓存到 Session，以避免后续请求不停的访问服务器
    permissionModel: { permission: {}, isPermissionLoaded: false },
 
    permissionCheck: function (roleCollection) {
      // 返回一个承诺(promise).
      var deferred = $q.defer();
 
      // 这里只是在承诺的作用域中保存一个指向上层作用域的指针。
      var parentPointer = this;
 
      // 检查是否已从服务获取到权限对象(已登录用户的角色列表)
      if (this.permissionModel.isPermissionLoaded) {
 
        // 检查当前用户是否有权限访问当前路由
        this.getPermission(this.permissionModel, roleCollection, deferred);
      } else {
        // 如果还没权限对象，我们会去服务端获取。
        // 'api/permissionService' 是本例子中的 web 服务地址。
 
        $resource('/api/permissionService').get().$promise.then(function (response) {
          // 当服务器返回之后，我们开始填充权限对象
          parentPointer.permissionModel.permission = response;
 
          // 将权限对象处理完成的标记设为 true 并保存在 Session，
          // Session 中的用户，在后续的路由请求中可以重用该权限对象
          parentPointer.permissionModel.isPermissionLoaded = true;
 
          // 检查当前用户是否有必须角色访问该路由
          parentPointer.getPermission(parentPointer.permissionModel, roleCollection, deferred);
        }
        );
      }
      return deferred.promise;
    },
 
    //方法:检查当前用户是否有必须角色访问该路由
    //'permissionModel' 保存了从服务端返回的当前用户的角色信息
    //'roleCollection' 保存了可访问当前路由的角色列表
    //'deferred' 是用来处理承诺的对象
    getPermission: function (permissionModel, roleCollection, deferred) {
      var ifPermissionPassed = false;
 
      angular.forEach(roleCollection, function (role) {
        switch (role) {
          case roles.superUser:
            if (permissionModel.permission.isSuperUser) {
              ifPermissionPassed = true;
            }
            break;
          case roles.admin:
            if (permissionModel.permission.isAdministrator) {
              ifPermissionPassed = true;
            }
            break;
          case roles.user:
            if (permissionModel.permission.isUser) {
              ifPermissionPassed = true;
            }
            break;
          default:
            ifPermissionPassed = false;
        }
      });
      if (!ifPermissionPassed) {
        // 如果用户没有必须的权限，我们把用户引导到无权访问页面
        $location.path(routeForUnauthorizedAccess);
        // 由于这个处理会有延时，而这期间页面位置可能发生改变， 
        // 我们会一直监视 $locationChangeSuccess 事件
        // 并且当该事件发生的时，就把掉承诺解决掉。
        $rootScope.$on('$locationChangeSuccess', function (next, current) {
          deferred.resolve();
        });
      } else {
        deferred.resolve();
      }
    }
  };
});

3 Encrypted routing

Then let’s use the fruits of our efforts to encrypt routing:

var appModule = angular.module("appModule", ['ngRoute', 'ngResource'])
  .config(function ($routeProvider, $locationProvider) {
    $routeProvider
      .when('/superUserSpecificRoute', {
        templateUrl: '/templates/superUser.html', // 路由的 view/template 路径
        caseInsensitiveMatch: true,
        controller: 'superUserController', // 路由的 angular 控制器
        resolve: {
          // 在这我们将使用我们上面的努力成果，调用授权服务
          // resolve 是 angular 中一个非常赞的特性，可以确保
          // 只有当它下面提到的承诺被处理之后
          // 才将控制器(在本例中是 superUserController)应用到路由。
          permission: function (authorizationService, $route) {
            return authorizationService.permissionCheck([roles.superUser]);
          },
        }
      })
      .when('/userSpecificRoute', {
        templateUrl: '/templates/user.html',
        caseInsensitiveMatch: true,
        controller: 'userController',
        resolve: {
          permission: function (authorizationService, $route) {
            return authorizationService.permissionCheck([roles.user]);
          },
        }
      })
      .when('/adminSpecificRoute', {
        templateUrl: '/templates/admin.html',
        caseInsensitiveMatch: true,
        controller: 'adminController',
        resolve: {
          permission: function (authorizationService, $route) {
            return authorizationService.permissionCheck([roles.admin]);
          },
        }
      })
      .when('/adminSuperUserSpecificRoute', {
        templateUrl: '/templates/adminSuperUser.html',
        caseInsensitiveMatch: true,
        controller: 'adminSuperUserController',
        resolve: {
          permission: function (authorizationService, $route) {
            return authorizationService.permissionCheck([roles.admin, roles.superUser]);
          },
        }
      });
  });