角度为6,EmptyError:顺序中没有元素-拦截器可能不正确

时间:2018-09-25 10:32:49

标签: angular rxjs angular6

我有基本的后卫。用户登录后将被重定向。

export class AuthGuard implements CanActivate {
  constructor(private router: Router, private auth: AuthService) {}
  canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot) {
    return this.auth.isAuthenticated().pipe(
      map(isAuthenticated => {
        if (isAuthenticated) {
          this.router.navigate(environment.redirectPage);
          return false;
        }
        return true;
      })
    );
  }
}

这些是用于检查身份验证的功能

verifyToken (token: string): Observable<any> {
  const data = {'token': token};
  return this.http.post(`${this.url}/jwt/verify/`, data);
}

isAuthenticated () {
  const token = localStorage.getItem('token');
  if (token) {
    return this.verifyToken(token).pipe(
      map(data => true),
      catchError (error => {
        localStorage.removeItem('token');
        return of(false);
      }),
      shareReplay()
    );
  }
  return of(false);
}

我有自定义拦截器

intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
  const token = localStorage.getItem('token');
  if (token) {
    request = request.clone({setHeaders: {
        Authorization: `JWT ${token}`
    }});
  }

  return next.handle(request).pipe(catchError((error, caught) => {
    if (error.status === 401) {
      this.router.navigate([`/auth`]);
    }
    return of(error);
  }) as any);
}

此错误是在将管道添加到handle()后发生的

所以这会导致错误:

return next.handle(request).pipe(catchError((error, caught) => {
    if (error.status === 401) {
      this.router.navigate([`/auth`]);
    }
    return of(error);
  }) as any);

但不是:

return next.handle(request);

我用pipe'ing next.handle()做错什么了?

1 个答案:

答案 0 :(得分:1)

您必须在next.handler中重新抛出错误,以使您的AuthGuard能够捕获该错误。

return next.handle(req).pipe(
  catchError(err => {
    return throwError(err);

  })
);

然后,您可以针对防护中的错误进行任何操作:

return this.auth.isAuthenticated().pipe(
      map(isAuthenticated => {
        if (isAuthenticated) {
          this.router.navigate(environment.redirectPage);
          return false;
        }
        return true;
      }),
      catchError(err => {
        this.router.navigate(['/sign-in']);
        return of(err);
      })
    );