Angular: 如何在 RouteGuard 中相对于目标路由调用 router.navigate()?

Angular: how to call router.navigate() relative to target route in a RouteGuard?

我有一个使用 Angular 开发的现有项目 4. 我需要根据用户权限控制对特定路径的访问。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 的访问。如果用户没有足够的权限,he/she 将被重定向到 ... /product/CategoryB。我写了一个 CanActivate RouteGuard 来做这个,守卫 class 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,但我想要相对于目标路由的重定向,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 个对象,而我只有 ActivatedRouteSnapshotRouterStateSnapshot。有没有办法相对于目标路线进行导航(在本例中为 categoryA)?任何帮助将不胜感激。

注:

事实证明,构造函数注入 ActivatedRouteRouteGuard 中的工作方式与 Component 等其他地方不同。

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

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

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

我找不到更好的方法来解决这个问题,但以下代码对我有用:

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;
        });
}