angular 5 google oauth登录令牌刷新

Question

在我的角度应用程序中，我正在尝试使用google oAuth进行身份验证。我使用了 angular5-social-login 库。问题是在检查routeGuard服务中的凭据时，我的凭据为null。

app.module

const appRoutes: Routes = [
    { path: 'login/:reason', component: LoginComponent },
    {
        path: '', canActivate: [AuthGuardService], children: [
            { path: 'dashboard', loadChildren: './dashboard/dashboard.module#DashboardModule' },
            { path: '', redirectTo: '/dashboard', pathMatch: 'full' },
            { path: '*', redirectTo: '/dashboard', pathMatch: 'full' }]
    }]; 



 export function getAuthServiceConfigs() {
let config = new AuthServiceConfig(
    [
        {
            id: GoogleLoginProvider.PROVIDER_ID,
            provider: new GoogleLoginProvider(environment.GoogleClientID)
        },
    ]
);
    return config;
}
@NgModule({
    declarations: [
        AppComponent
    ],

imports: [
    BrowserModule,
    SocialLoginModule, //for Google oAuth
    BrowserAnimationsModule,
    HttpClientModule,
    RouterModule.forRoot(appRoutes)
],

providers: [
    {
        provide: AuthServiceConfig,
        useFactory: getAuthServiceConfigs
    },
    AuthGuardService],

    bootstrap: [AppComponent]
})

export class AppModule { }

AUTH-guard.service

        @Injectable()
export class AuthGuardService implements CanActivate {

  user: SocialUser;

  constructor(private socialAuthService: AuthService, private _router: Router) { }


  canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): boolean {
    if (localStorage.getItem('socialUser')) {
      this.socialAuthService.authState.subscribe(user => this.user = user);
      if (this.user != null) {
        return true
      }
    }
  }

下次调用时，用户变量不为空，此问题仅在启动时发生。如何使用此库使其工作？如果不可能，请建议我一个好的认证库？