使用解析器和警衛

我們在路由配置中使用頂級保護來捕獲第一頁載入時的當前使用者，並使用解析器來儲存 currentUser 的值，currentUser 是我們來自後端的經過身份驗證的使用者。

我們的實現的簡化版本如下：

這是我們的頂級路線：

export const routes = [
{
  path: 'Dash',
  pathMatch : 'prefix',
  component: DashCmp,
  canActivate: [AuthGuard],
  resolve: {
      currentUser: CurrentUserResolver
  },
  children: [...[
    path: '',
    component: ProfileCmp,
    resolve: {
        currentUser: currentUser
    }
  ]]
  }
];

這是我們的 AuthService

import { Injectable } from '@angular/core';
import { Http, Headers, RequestOptions } from '@angular/http';
import { Observable } from 'rxjs/Rx';
import 'rxjs/add/operator/do';

@Injectable()
export class AuthService {
  constructor(http: Http) {
    this.http = http;

    let headers = new Headers({ 'Content-Type': 'application/json' });
    this.options = new RequestOptions({ headers: headers });
  }
  fetchCurrentUser() {
    return this.http.get('/api/users/me')
      .map(res => res.json())
      .do(val => this.currentUser = val);
 }
}

這是我們的 AuthGuard：

import { Injectable } from '@angular/core';
import { CanActivate } from "@angular/router";
import { Observable } from 'rxjs/Rx';

import { AuthService } from '../services/AuthService';

@Injectable()
export class AuthGuard implements CanActivate {
  constructor(auth: AuthService) {
    this.auth = auth;
  }
  canActivate(route, state) {
    return Observable
      .merge(this.auth.fetchCurrentUser(), Observable.of(true))
      .filter(x => x == true);
  }
}

這是我們的 CurrentUserResolver：

import { Injectable } from '@angular/core';
import { Resolve } from "@angular/router";
import { Observable } from 'rxjs/Rx';

import { AuthService } from '../services/AuthService';

@Injectable()
export class CurrentUserResolver implements Resolve {
  constructor(auth: AuthService) {
    this.auth = auth;
  }
  resolve(route, state) {
    return this.auth.currentUser;
  }
}