login(username: string, password: string) {
    const body = {username: username, password: password};
    return this.http.post<AuthResponse>(`${this.baseUrl}`, body, { observe: 'response' })
      .subscribe(response => {
        const user = response.body;
        if (user && user.token) {
          localStorage.setItem(this.localStorageKey, JSON.stringify(user));
          return true;
        }

        localStorage.removeItem(this.localStorageKey);
        return false;
      });
  }