ProviderLoginController.php

<?php

namespace App\Http\Controllers\Auth;

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

class ProviderLoginController extends Controller
{
    public function redirectToProvider()
    {
        return Socialite::driver('provider')->redirect();
    }

    public function handleProviderCallback()
    {
        try {
            $provider_user = Socialite::driver('provider')->user();
        } catch (\Exception $e) {
            return redirect()->route('login');
        }

        $existingUser = User::where('email', $provider_user->getEmail())->first();

        if ($existingUser) {

            // Update the user access token 
            $existingUser->access_token = $provider_user->token;
            $existingUser->save();
            
            // Log the user in
            auth()->login($existingUser, true);
          
        } else {

            $newUser                    = new User;
            $newUser->provider_name     = 'provider';
            $newUser->provider_id       = $provider_user->id;
            $newUser->access_token      = $provider_user->token;
            $newUser->refresh_token     = $provider_user->refreshToken;
            $newUser->expires_in        = $provider_user->expiresIn;
            $newUser->name              = $provider_user->name;
            $newUser->email             = $provider_user->email;
            $newUser->email_verified_at = now();
            $newUser->save();

            auth()->login($newUser, true);
          
        }

        return redirect('/home');
    }
}