Laravel 5.4 with Laravel Socialite

LoginController.php

<?php

namespace App\Http\Controllers\Auth;

use JWTAuth;
use Socialite;
use App\User;
use App\Transformers\UserTransformer;
use App\Http\Controllers\Controller;
use Tymon\JWTAuth\Exceptions\JWTException;
use Illuminate\Http\Request;

class LoginController extends Controller
{
  
  /**
     * Authenticate User Via Provider
     *
     * @param  provider
     * @return Response
     */
    public function authenticateViaProvider(Request $request)
    {
        $credentials = $request->only('provider', 'id', 'token');
        $providerUser = Socialite::driver($credentials['provider'])
                                ->userFromToken($credentials['token']);
        if($providerUser) {
            $o_user = User::findByProvider($credentials['provider'], $credentials['id'], $credentials['token'])->first();

            if($o_user) {
                $token = JWTAuth::fromUser($o_user);
                if($o_user->isActivated()) {
                    $user = $this->transformItem($o_user, new UserTransformer);

                    return $this->response->array(compact('token','user'))->setStatusCode(200);
                }
            }
        }

        return $this->response->errorUnauthorized('Token is not valid');
    }
  
}

SocialController.php

<?php

namespace App\Http\Controllers\Auth;

use Socialite;
use App\User;
use App\Http\Controllers\Controller;
use Illuminate\Http\Request;

class SocialController extends Controller
{

	/**
	 * Array of allowed providers
	 *
	 * @var string
	 */
	protected $providers = [
		'facebook'
	];

	/**
	 * Array of scopes for providers
	 *
	 * @var string
	 */
	protected $scopes = [
		'facebook' => [
			'user_birthday',
			'user_location'
		]
	];

	/**
	 * Array of fields for providers
	 *
	 * @var string
	 */
	protected $fields = [
		'facebook' => [
			'first_name',
			'last_name',
			'email',
			'gender',
			'birthday',
			'location'
		]
	];

	/**
	* Redirect the user to the Facebook authentication page.
	 *
	 * @param  provider
	 * @return Response
	 */
	public function redirectToProvider($provider)
	{
		if($this->isProviderAllowed($provider)) {
			
			return Socialite::driver($provider)
				->scopes($this->scopes[$provider])
				->fields($this->fields[$provider])
				->redirect();
		}

		return redirect()->to('/');
	}

	/**
	 * Obtain the user information from Facebook.
	 *
	 * @param  provider
	 * @return Response
	 */
	public function handleProviderCallback(Request $request, $provider)
	{
		if (!$request->has('code') || $request->has('denied')) {
        	return redirect()->to('/');
        }

		if($this->isProviderAllowed($provider)) {
			$providerUser = Socialite::driver($provider)
				->fields($this->fields[$provider])
				->user();

			$user = User::findByProviderId($provider, $providerUser->id)->first();
			
			if($user) {
				//already a user
				if($provider == 'facebook') {
					$user->facebook_id = $providerUser->id;
					$user->facebook_token = $providerUser->token;
					$user->save();
				}

				$s_route = 'sign-in?'.
				'provider='.$provider.
				'&provider_id='.$providerUser->id.
				'&provider_token='.$providerUser->token;

			} else {
				$s_route = 'sign-up?'.
				'first_name='.$providerUser->user['first_name'].
				'&last_name='.$providerUser->user['last_name'].
				'&gender='.$providerUser->user['gender'].
				'&provider='.$provider.
				'&provider_id='.$providerUser->id.
				'&provider_token='.$providerUser->token;

				if(isset($providerUser->user['email'])) {
					$s_route.='&email='.$providerUser->user['email'];
				}
				
				if(isset($providerUser->user['birthday'])) {
					$s_route.='&birthday='.$providerUser->user['birthday'];
				}
			}
			
			return redirect()->to($s_route);
		}

		return redirect()->to('/');
	}

	/**
	 * Check for provider allowed and services configured
	 *
	 * @param $provider
	 * @return bool
	 */
	private function isProviderAllowed($provider)
	{
		return in_array($provider, $this->providers) && config()->has("services.{$provider}");
	}

}

User.php

<?php

namespace App;

use Illuminate\Notifications\Notifiable;
use Illuminate\Foundation\Auth\User as Authenticatable;
use Illuminate\Database\Eloquent\SoftDeletes;

class User extends Authenticatable
{
    use Notifiable;
    use SoftDeletes;


    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'first_name', 'last_name', 'email', 'status', 'password', 'facebook_id', 'facebook_token', 'password_reset'
    ];

    /**
     * The attributes that should be hidden for arrays.
     *
     * @var array
     */
    protected $hidden = [
        'password', 'remember_token',
    ];
    
    //relationships
    
    //scopes

    public function scopeFindByEmail($query, $email) {
        return $query->where('email', $email);
    }
    
    public function scopeFindByProvider($query, $provider, $provider_id, $provider_token) {
        return $query->where($provider.'_id', $provider_id)
            ->where($provider.'_token', $provider_token);
    }
    
    public function scopeFindByProviderId($query, $provider, $provider_id) {
        return $query->where($provider.'_id', $provider_id);
    }
}

web.php

<?php

/*
|--------------------------------------------------------------------------
| Web Routes
|--------------------------------------------------------------------------
|
| Here is where you can register web routes for your application. These
| routes are loaded by the RouteServiceProvider within a group which
| contains the "web" middleware group. Now create something great!
|
*/

Route::get('auth/redirect/{provider}', 'Auth\SocialController@redirectToProvider');
Route::get('auth/handler/{provider}', 'Auth\SocialController@handleProviderCallback');