6

我有一个使用 Angular 4 开发的现有项目。我需要根据用户权限控制对特定路由的访问。简化的路由配置如下所示:

[
    { path: '', redirectTo: '/myApp/home(secondary:xyz)', pathMatch: 'full' },
    { path: 'myApp'
      children: [
        { path: '', redirectTo: 'home', pathMatch: 'full' },
        { path: 'home', ... },
        ...
        { path: 'product'
          children: [
            { path: '', redirectTo: 'categoryA', pathMatch: 'full' },
            { path: 'categoryA', component: CategoryAComponent, canActivate: [CategoryACanActivateGuard]},
            { path: 'categoryB', component: CategoryBComponent},
            ...
          ]
        },
        ...
      ]
    },
    ...
]

现在,我想控制对www.myWeb.com/myApp/product/categoryA. 如果用户没有足够的权限,他/她将被重定向到... /product/CategoryB. 我写了一个CanActivateRouteGuard 来做到这一点,警卫类看起来像这样:

import { Injectable } from '@angular/core';
import { CanActivate, Router, ActivatedRouteSnapshot, RouterStateSnapshot, ActivatedRoute } from '@angular/router';
import { MyService } from '... my-service.service';

@Injectable()
export class CategoryACanActivateGuard implements CanActivate {
    constructor(private myService: MyService, private router: Router) { }

    canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): Promise<boolean> {
        return this.myService.checkPermission()
            .then(result => {
                if (!result.hasAccess) {
                    //redirect here

                    this.router.navigate(['./myApp/product/categoryB']); 
                    //works, but I want to remove hardcoding 'myApp'

                    //this.router.navigate(['../../categoryB']);
                    //doesn't work, redirects to home page

                    //this.router.navigate(['./categoryB'], { relativeTo: this.route});
                    //do not have this.route object. Injecting Activated route in the constructor did not solve the problem

                }
                return result.hasAccess;
            });
    }
}

一切正常,但我希望相对于目标路由进行重定向,如下所示:

this.router.navigate(['/product/categoryB'], { relativeTo: <route-of-categoryA>});
// or 
this.router.navigate(['/categoryB'], { relativeTo: <route-of-categoryA>});

不幸的是,relativeTo只接受ActivatedRoute对象,我所拥有的只是ActivatedRouteSnapshotand RouterStateSnapshot。有没有办法相对于目标路线进行导航(在这种情况下为 categoryA)?任何帮助将不胜感激。

笔记:

  • 除了添加一些路由保护之外,我无法更改路由配置。
  • 我不是在寻找this.router.navigateByUrl使用state.url. 我想用router.navigate([...], { relativeTo: this-is-what-need}).
4

1 回答 1

14

事实证明,与Component等其他地方相比, RouteGuardActivatedRoute中注入的构造函数的工作方式不同。

在组件中,ActivatedRoute对象指向激活该组件的路由。例如,在CategoryAComponent类中,以下代码将导航到CategoryB

this.router.navigate([ '../CategoryB' ], { relativeTo: this.route });

RouteGuard但是,上面的相同代码在添加到CategoryA路由配置的类中不起作用。在我的测试中,我发现构造函数注入的ActivatedRoute对象指向根路由。另一方面,ActivatedRouteSnapshot对象(作为参数传入canActivate函数)指向目标路由(在我的例子中为 categoryA)。但是,我们不能在函数中传递这个ActivatedRouteSnapshot对象。this.router.navigate(...)

我找不到更好的方法来解决这个问题,但下面的代码对我有用:

canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): Promise<boolean> {
    return this.myService.checkPermission()
        .then(result => {
            if (!result.hasAccess) {
                //redirect here

                let redirectTo = route.pathFromRoot
                    .filter(p => p !== route && p.url !== null && p.url.length > 0)
                    .reduce((arr, p) => arr.concat(p.url.map(u => u.path)), new Array<string>());

                this.router.navigate(redirectTo.concat('categoryB'), { relativeTo: this.route });
            }
            return result.hasAccess;
        });
}
于 2018-04-13T18:15:38.870 回答