definma-ui/src/app/services/login.service.ts

import { Injectable } from '@angular/core';
import {ApiService} from './api.service';
import {ActivatedRouteSnapshot, CanActivate, RouterStateSnapshot} from '@angular/router';
import {LocalStorageService} from 'angular-2-local-storage';
import {Observable} from 'rxjs';

@Injectable({
  providedIn: 'root'
})
export class LoginService implements CanActivate {

  private maintainPaths = ['templates'];

  private loggedIn;
  private level;

  constructor(
    private api: ApiService,
    private storage: LocalStorageService
  ) {

  }

  login(username = '', password = '') {
    return new Promise(resolve => {
      if (username !== '') {
        this.storage.set('basicAuth', btoa(username + ':' + password));
      }
      this.api.get('/authorized', (data: any, error) => {
        if (!error) {
          if (data.status === 'Authorization successful') {
            this.loggedIn = true;
            this.level = data.level;
            resolve(true);
          } else {
            this.loggedIn = false;
            this.storage.remove('basicAuth');
            resolve(false);
          }
        } else {
          this.loggedIn = false;
          this.storage.remove('basicAuth');
          resolve(false);
        }
      });
    });
  }

  logout() {
    this.storage.remove('basicAuth');
    this.loggedIn = false;
  }

  canActivate(route: ActivatedRouteSnapshot = null, state: RouterStateSnapshot = null): Observable<boolean> {
    return new Observable<boolean>(observer => {
      const isMaintainPath = this.maintainPaths.indexOf(route.url[0].path) >= 0;
      if (!isMaintainPath || (isMaintainPath && this.isMaintain)) {
        if (this.loggedIn === undefined) {
          this.login().then(res => {
            observer.next(res as any);
            observer.complete();
          });
        }
        else {
          observer.next(this.loggedIn);
          observer.complete();
        }
      }
      else {
        observer.next(false);
        observer.complete();
      }
    });
  }

  get isLoggedIn() {
    return this.loggedIn;
  }

  get isMaintain() {
    return this.level === 'maintain' || this.level === 'admin';
  }

  get username() {
    return atob(this.storage.get('basicAuth')).split(':')[0];
  }
}