edu-textbook/projects/textbook/src/services/auth.guard.ts

import { Injectable } from "@angular/core";
import {
  CanActivate,
  ActivatedRouteSnapshot,
  RouterStateSnapshot,
} from "@angular/router";
import { Observable } from "rxjs";
import { Router } from "@angular/router";
import { AuthServr } from "./auth.service";
import Parse from "parse";

@Injectable({
  providedIn: "root",
})
export class AuthGuard implements CanActivate {
  LoginPage = "/user/login";

  constructor(public authService: AuthServr, public router: Router) {}

  canActivate(
    next: ActivatedRouteSnapshot,
    state: RouterStateSnapshot
  ): Observable<boolean> | Promise<boolean> | boolean {
    // 当前路由url
    let url: string = state.url;
    return this.checkLogin(url);
  }
  checkLogin(url: string): boolean {
    // 如果已登录,直接跳转当前路由 跳出该函数
    let currentUser = Parse.User.current();
    if (currentUser && currentUser.id) {
      return true;
    }
    // 否则重定向到login页面
    this.authService.redirectUrl = url;
    this.router.navigate([this.LoginPage]);
    return false;
  }
}
export { CanActivate };