blue-twilight/app/Http/Controllers/Auth/LoginController.php

<?php

namespace App\Http\Controllers\Auth;

use App\Facade\Theme;
use App\Http\Controllers\Controller;
use Illuminate\Foundation\Auth\AuthenticatesUsers;
use Illuminate\Http\Request;
use Socialite;

class LoginController extends Controller
{
    /*
    |--------------------------------------------------------------------------
    | Login Controller
    |--------------------------------------------------------------------------
    |
    | This controller handles authenticating users for the application and
    | redirecting them to your home screen. The controller uses a trait
    | to conveniently provide its functionality to your applications.
    |
    */

    use AuthenticatesUsers;

    /**
     * Where to redirect users after login / registration.
     *
     * @var string
     */
    protected $redirectTo = '/';

    /**
     * Create a new controller instance.
     *
     * @return void
     */
    public function __construct()
    {
        $this->middleware('guest', ['except' => 'logout']);
    }

    protected function credentials(Request $request)
    {
        $result = $request->only($this->username(), 'password');

        // Only allow activated users to login
        $result['is_activated'] = true;

        return $result;
    }

    /**
     * Show the application's login form.
     *
     * @return \Illuminate\Http\Response
     */
    public function showLoginForm(Request $request)
    {
        return Theme::render('auth.v2_unified', [
            'active_tab' => 'login',
            'info' => $request->session()->get('info')
        ]);
    }

    /**
     * Redirect the user to the Facebook authentication page.
     *
     * @return \Illuminate\Http\Response
     */
    public function redirectToFacebook()
    {
        return Socialite::driver('facebook')->redirect();
    }

    /**
     * Obtain the user information from Facebook.
     *
     * @return \Illuminate\Http\Response
     */
    public function handleFacebookCallback()
    {
        $user = Socialite::driver('facebook')->user();
        dd($user);

        // $user->token;
    }
}