Angular 2用户级别和路由

Question

我创建了angualar 2 firebase项目，该项目能够添加删除编辑帖子。使用firebase gmail身份验证进行身份验证。这对于这一点非常有用。但我想创建管理员，他可以看到帖子。当我输入myexample时。 com / admin我想去同一个站点的管理页面，管理员页面应该是电子邮件验证。但是当我输入那个url（myexample.com/admin）用户登录页面display.im newbie to web development。

my routes.ts

      const routes: Routes = [
     { path: '',  redirectTo:'main', pathMatch: 'full'},
     { path:'login',component:LoginComponent},
     { path:'admin',component: AdminLoginComponent},
     { path: 'main', component:AdminBodyComponent  },
     { path: 'adminpanel', component:AdminComponent  },
     { path: 'posts',component:PostsComponent},
     { path: 'addposts',component:AddPostComponent},
     { path: 'editposts/:id',component:EditpostComponent}
      ];

app.component.ts

      this.authService.af.auth.subscribe((auth)=>{

      if(auth == null && this.router.url != '/admin'){
          //not logged int

          this.isLoggedIn =false;
          this.displayName='';
          this.userMail=''; 
          this.router.navigate(['login']);

      }else if(this.router.url == 'admin'){


          this.isAdmin=true;
          this.router.navigate(['admin']);

      }
      else{
          //logged in

          this.isLoggedIn=true;
          this.displayName=auth.google.displayName;
          this.userMail=auth.google.email; 
          this.router.navigate([''])
      }
  })

 }