angular2-jwt token alwas not valid

Question

So I have a simple angular 2/laravel app wit jwt authentification support. I have a service that verifies everytime a route is called if the jwt token is valid or not using the angular2-jwt tokenNotExpired() function, but this function always return false for a reason, so the user would be always redirected to login page.

So it goes like that the user logs in, a token will be generated from the backend and saved on local storage, than a service will check if the token is valid before initiating any route using the CanActivate lifecycle hook.

Here is what i did so far:

Login Component:

   ...
            this.http.post(SERVER_URL + 'auth', body, {
                headers: headers
            }
            ).subscribe(
                data => {

                    localStorage.setItem('auth_token', data.json().token);
                    this.authHttp.get(SERVER_URL + 'auth/user', headers)
                        .subscribe(
                        data => {
                            this.store.dispatch({ type: SET_CURRENT_USER_PROFILE, payload: data.json().user });
                            localStorage.setItem('user', data.json().user);
                            this.router.navigate(['/home']);

                        },
                        err => console.log('Fehlermeldung: ' + err)
                        );

                },
...

app.module :

...
 { provide: AuthConfig, useValue: new AuthConfig({
              headerName: 'Authorization',
              headerPrefix: 'Bearer ',
              tokenName: 'auth_token',
              tokenGetter: (() => localStorage.getItem('auth_token')),
              globalHeaders: [{ 'Content-Type': 'application/json' }],
              noJwtError: true,
              noTokenScheme: true
  })},
    AuthHttp
...

auth.service : // Check JWT token service

import { tokenNotExpired } from 'angular2-jwt';
import { Injectable } from '@angular/core';

@Injectable()
export class AuthService  {

    loggedIn() {
    return tokenNotExpired();
    }

}

auth.guard.service :

// Check if the Token of the user is still valid
import { Injectable } from '@angular/core';
import { Router } from '@angular/router';
import { CanActivate } from '@angular/router';
import { AuthService } from './auth.service';
import { AppState } from '../shared/interfaces';
import { SET_CURRENT_USER_PROFILE } from '../shared/state.actions';



import { Store } from '@ngrx/store'

@Injectable()
export class AuthGuardService implements CanActivate {

  constructor(private auth: AuthService, private router: Router, private store: Store<AppState>) {}

  canActivate() {
    if(this.auth.loggedIn()) {
      return true;
    } else {
        console.log ('Token expired or not valid')
        localStorage.setItem('auth_token', '');
        localStorage.setItem('user', '');
        this.store.dispatch({ type: SET_CURRENT_USER_PROFILE, payload: null });
        this.router.navigate(['/']);
      return false;
    }
  }
}

app.routing :

const routes: Routes = [
  { path: 'home', component: HomeComponent},
  { path: 'about', component: AboutComponent, canActivate: [AuthGuardService]},
  { path: 'profile/:id', component: ProfileComponent, canActivate: [AuthGuardService]},
  { path: '', component: LoginComponent}
];

EDIT: From the backend side everything is normally ok since the token is generated and stored in the localstorage after the user logs in.

Answer 1

Its because of the property name, it assumes it is "token". So when you provide the property name as first parameter, it will work properly.

For example:

 tokenNotExpired('auth_token') 

Some more information on the matter can be found here: https://github.com/auth0/angular2-jwt/issues/334

Answer 2

SOLUTION: So this is how i fixed it for everyone who may have the same problem, i used JWTHelper function isTokenExpired() instead of tokenNotExpired and I inversed the logic in the service and it worked not really sure why though

auth.service looks like that now :

@Injectable()
export class AuthService  {

    private jwtHelper: JwtHelper = new JwtHelper();
    private token = localStorage.getItem('auth_token');

    isExpired() {
        return this.jwtHelper.isTokenExpired(this.token);
    }

}

and auth.guard.service canActivate():

  canActivate() {
    if (this.auth.isExpired()) {
        console.log (this.auth.isExpired());
        localStorage.setItem('auth_token', '');
        localStorage.setItem('user', '');
        this.store.dispatch({ type: SET_CURRENT_USER_PROFILE, payload: null });
        this.router.navigate(['/']);
      return false;
    } else {
      return true;
    }
  }

Answer 3

`localStorage.setI`tem('id-token',token);

用于将令牌保存到本地存储/会话存储的相同令牌名称可以作为参数传递给

return tokenNotExpired('id-token');

Answer 4

Pass the token as a parameter.

Change

loggedIn() {
  return tokenNotExpired();
}

to

loggedIn() {
  return tokenNotExpired('id_token');
}