Angular Guard失效

我希望我的身份验证卫士基于定期触发布尔值的可观察对象来允许/限制访问。我的想法是:

auth$ = interval(5000).pipe(map((n) => n % 2 === 0));

canActivate(
    next: ActivatedRouteSnapshot,
    state: RouterStateSnapshot
): Observable<boolean> | Promise<boolean> | boolean {
    return this.auth$;
}

It works when the triggers goes from false to true, but not the opposite, looks like the guard is not active anymore then.

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mneque
mneque

每次导航开始时都会触发一次防护。

一旦angular从守卫那里获得了第一个发射,它便退订并使用发射值来允许/禁止路由。

这意味着-您不能定期发出保护值以更改原始发出的值。

您尝试实现的目标可以通过以下方式实现:

import {Injectable, OnDestroy} from '@angular/core';
import {CanActivate} from '@angular/router';
import {interval, Observable, Subject} from 'rxjs';
import {map, takeUntil, tap} from 'rxjs/operators';

@Injectable({
    providedIn: 'root',
})
export class AuthGuard implements CanActivate, OnDestroy {
    protected readonly auth$: Subject<boolean> = new Subject();
    protected readonly destroy$: Subject<void> = new Subject();

    constructor(
    ) {
        interval(5000).pipe(
            map(n => n % 2 === 0),
            tap(value => this.auth$.next(value)),
            takeUntil(this.destroy$),
        ).subscribe();
    }

    public canActivate(): Observable<boolean> {
        return this.auth$;
    }

    // not sure if this part works for guards
    // but would be nice to unsubscribe once you don't need this guard
    // anymore
    public ngOnDestroy(): void {
        this.destroy$.next();
        this.destroy$.complete();
    }
}
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