KCI-CAMPAIGN-TRACKER/app/Controllers/AuthController.php

<?php

declare(strict_types=1);

namespace App\Controllers;

use Core\Controller;
use Core\Request;
use Core\Response;

class AuthController extends Controller
{
    public function login(): Response
    {
        if (auth()->check()) {
            return $this->redirect('/');
        }

        return $this->redirect(auth()->beginLogin());
    }

    public function callback(): Response
    {
        $request = Request::capture();
        $error   = (string) $request->input('error', '');

        if ($error !== '') {
            $desc = (string) $request->input('error_description', $error);
            return new Response('Authentication error: ' . e($desc), 400);
        }

        $code  = (string) $request->input('code', '');
        $state = (string) $request->input('state', '');

        if ($code === '' || $state === '') {
            return $this->redirect('/login');
        }

        try {
            auth()->handleCallback($code, $state);
        } catch (\Throwable $e) {
            return new Response('Login failed: ' . e($e->getMessage()), 400);
        }

        return $this->redirect('/');
    }

    public function logout(): Response
    {
        return $this->redirect(auth()->logout());
    }
}