exportinterface CanActivate {
 canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): Observable<boolean> | Promise<boolean> | boolean;
}

{
 path: '',
 redirectTo: '/home',
 pathMatch: 'full'
}

import{ Observable }from'rxjs/Observable';
import'rxjs/add/observable/of';

@Injectable()
exportclassAuthService{
 account: Account;

// simulation to login.
 login(role: string): Observable<Account> {
letaccount =newAccount();
 account.id = 11;
 account.name = 'super man';
 account.roles = [role];
this.account = account;
returnObservable.of(account);
 }
 getAccount(): Account {
returnthis.account;
 }
 isLogdedin(): boolean {
returnthis.account &&this.account.id !=null;
 }
 hasRole(role: string): boolean {
returnthis.account &&this.account.roles.includes(role);
 }
}

exportconstTodoRoutes: Route[] = [
 {
 path: 'todo',
 children: [
 {
 path: 'list',
 component: TodoListComponent
 },
 {
 path: 'detail/:id',
 component: TodoDetailComponent
 }
 ]
 }
];

import{ Injectable }from'@angular/core';
import{ CanActivateChild, Router,
 ActivatedRouteSnapshot, RouterStateSnapshot } from'@angular/router';

import{ AuthService }from'../services/auth.service';
import{ TodoDetailComponent }from'./detail/detail.component';

@Injectable()
exportclassMyTodoGuardimplementsCanActivateChild{

constructor(private authService: AuthService, private router: Router) {}

 canActivateChild(childRoute: ActivatedRouteSnapshot, state: RouterStateSnapshot) {
if(!this.authService.isLogdedin()) {
 alert('You need to login!');
this.router.navigate(['/home']);
returnfalse;
 }
if(this.authService.hasRole('CUSTOMER')) {
returntrue;
 }
returnfalse;
 }
}

@Injectable()
exportclassCanLeaveTodoDetailGuardimplementsCanDeactivate<TodoDetailComponent>{
 canDeactivate(component: TodoDetailComponent, route: ActivatedRouteSnapshot, state: RouterStateSnapshot) {
returnconfirm('Confirm?');
 }
}

import{ Injectable }from'@angular/core';
import{ Resolve, ActivatedRouteSnapshot, RouterStateSnapshot }from'@angular/router';

import{ Todo }from'./todo';
import{ TodoService }from'./todo.service';

@Injectable()
exportclassMyTodoResolverimplementsResolve<Todo>{

constructor(private todoService: TodoService) { }

 resolve(route: ActivatedRouteSnapshot, state: RouterStateSnapshot) {
console.log('Get my todo list.');
returnthis.todoService.getAllTodos();
 }
}

import{ Observable }from'rxjs/Observable';
import'rxjs/add/observable/of';
import'rxjs/add/operator/delay';

// 神略中间的部分
 getAllTodos(): Observable<Todo[]> {
lettodo1 =newTodo();
 todo1.id = 1;
 todo1.title = 'test task 1';
 todo1.createdDate = newDate();
 todo1.complete = false;
lettodo2 =newTodo();
 todo2.id = 2;
 todo2.title = 'test task 2';
 todo2.createdDate = newDate();
 todo2.complete = false;

this.todos = [todo1, todo2];
returnObservable.of(this.todos).delay(3000);
 }

exportclassTodoListComponent{
 newTodo: Todo = newTodo();
 todos: Todo[];
constructor(private todoService: TodoService, private route: ActivatedRoute) {
this.todos =this.route.snapshot.data['todos'];
 }
// 省略其他
}

exportconstTodoRoutes: Route[] = [
 {
 path: 'todo',
 canActivateChild: [MyTodoGuard],
 children: [
 {
 path: 'list',
 component: TodoListComponent,
 resolve: { todos: MyTodoResolver }
 },
 {
 path: 'detail/:id',
 component: TodoDetailComponent,
 canDeactivate: [ CanLeaveTodoDetailGuard ]
 }
 ]
 }
];

@NgModule({
 imports: [CommonModule, FormsModule ],
 declarations: [TodoListComponent, TodoDetailComponent, TodoItemComponent],
 providers: [TodoService, MyTodoResolver, MyTodoGuard, CanLeaveTodoDetailGuard]
})
exportclassTodoModule{}

exportconstTodoRoutes: Route[] = [
 {
 path: 'todo',
 data: {
 role: 'CUSTOMER'
 },
 canActivateChild: [MyTodoGuard],
 children: [
 {
 path: 'list',
 component: TodoListComponent,
 resolve: {
 todos: MyTodoResolver
 },
 data: {
 title: '列表'
 }
 },
 {
 path: 'detail/:id',
 component: TodoDetailComponent,
 canDeactivate: [ CanLeaveTodoDetailGuard ],
 data: {
 title: '详情'
 }
 }
 ]
 }
];

exportclassTodoListComponent{
 newTodo: Todo = newTodo();
 todos: Todo[];
 title: string;

constructor(private todoService: TodoService, private route: ActivatedRoute) {
this.todos =this.route.snapshot.data['todos'];
this.title =this.route.data['title'];
 }
// 省略其他
}

@Injectable()
exportclassMyTodoGuardimplementsCanActivateChild{

 canActivate(next: ActivatedRouteSnapshot, state: RouterStateSnapshot) {
if(!this.authService.isLogdedin()) {
 alert('You need to login!');
this.router.navigate(['/home']);
returnfalse;
 }
letrequiredRole = next.data['role'];
if(requiredRole ==null||this.authService.hasRole(requiredRole)) {
returntrue;
 }
returnfalse;
 }
}