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<?php
declare(strict_types=1);
// Handles authentication: register, login, logout, email verification, and password reset.
namespace App\Controllers;
use App\Csrf;
use App\Flash;
use App\Mail;
use App\Models\User;
class AuthController
{
private User $user;
public function __construct()
{
$this->user = new User();
}
public function registerForm(): void
{
$content = __DIR__ . '/../Views/auth/register.php';
include __DIR__ . '/../Views/layouts/main.php';
}
public function register(): void
{
if (!Csrf::validate($_POST['csrf_token'] ?? '')) {
Flash::set('error', 'Invalid CSRF token.');
header('Location: /register');
return;
}
$username = trim($_POST['username'] ?? '');
$email = trim($_POST['email'] ?? '');
$password = $_POST['password'] ?? '';
$passwordConfirm = $_POST['password_confirm'] ?? '';
// Validation
$errors = [];
if ($username === '' || $email === '' || $password === '') {
$errors[] = 'All fields are required.';
}
if (!preg_match('/^[a-zA-Z0-9_]{3,20}$/', $username)) {
$errors[] = 'Username must be 3-20 characters (letters, numbers, underscores).';
}
if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
$errors[] = 'Invalid email address.';
}
if (\strlen($password) < 8) {
$errors[] = 'Password must be at least 8 characters.';
}
if ($password !== $passwordConfirm) {
$errors[] = 'Passwords do not match.';
}
if ($this->user->findByUsername($username)) {
$errors[] = 'Username is already taken.';
}
if ($this->user->findByEmail($email)) {
$errors[] = 'Email is already registered.';
}
if ($errors) {
Flash::set('error', implode(' ', $errors));
header('Location: /register');
return;
}
$userId = $this->user->create($username, $email, $password);
$token = $this->user->getVerificationToken($userId);
Mail::sendVerification($email, $token);
Flash::set('success', 'Account created! Check your email to verify.');
header('Location: /login');
}
public function verify(): void
{
$token = $_GET['token'] ?? '';
$user = $this->user->findByVerificationToken($token);
if (!$user) {
Flash::set('error', 'Invalid or expired verification link.');
header('Location: /login');
return;
}
$this->user->verify($user['id']);
Flash::set('success', 'Email verified! You can now log in.');
header('Location: /login');
}
public function loginForm(): void
{
$content = __DIR__ . '/../Views/auth/login.php';
include __DIR__ . '/../Views/layouts/main.php';
}
public function login(): void
{
if (!Csrf::validate($_POST['csrf_token'] ?? '')) {
Flash::set('error', 'Invalid CSRF token.');
header('Location: /login');
return;
}
$username = trim($_POST['username'] ?? '');
$password = $_POST['password'] ?? '';
$user = $this->user->findByUsername($username);
// Use the same error message for wrong username or wrong password
// to avoid revealing which usernames exist (user enumeration)
if (!$user || !password_verify($password, $user['password_hash'])) {
Flash::set('error', 'Invalid username or password.');
header('Location: /login');
return;
}
if (!$user['is_verified']) {
Flash::set('error', 'Please verify your email before logging in.');
header('Location: /login');
return;
}
// Regenerate session ID to prevent session fixation attacks
session_regenerate_id(true);
$_SESSION['user_id'] = $user['id'];
$_SESSION['username'] = $user['username'];
header('Location: /');
}
public function logout(): void
{
session_destroy();
header('Location: /');
}
public function forgotPasswordForm(): void
{
$content = __DIR__ . '/../Views/auth/forgot-password.php';
include __DIR__ . '/../Views/layouts/main.php';
}
public function forgotPassword(): void
{
if (!Csrf::validate($_POST['csrf_token'] ?? '')) {
Flash::set('error', 'Invalid CSRF token.');
header('Location: /forgot-password');
return;
}
$email = trim($_POST['email'] ?? '');
// Always show the same message whether the email exists or not
// to prevent user enumeration
Flash::set('success', 'If that email is registered, a reset link has been sent.');
$user = $this->user->findByEmail($email);
if ($user) {
$token = $this->user->setResetToken($user['id']);
Mail::sendPasswordReset($email, $token);
}
header('Location: /login');
}
public function resetPasswordForm(): void
{
$token = $_GET['token'] ?? '';
$user = $this->user->findByResetToken($token);
if (!$user) {
Flash::set('error', 'Invalid or expired reset link.');
header('Location: /login');
return;
}
$content = __DIR__ . '/../Views/auth/reset-password.php';
include __DIR__ . '/../Views/layouts/main.php';
}
public function resetPassword(): void
{
if (!Csrf::validate($_POST['csrf_token'] ?? '')) {
Flash::set('error', 'Invalid CSRF token.');
header('Location: /login');
return;
}
$token = $_POST['token'] ?? '';
$password = $_POST['password'] ?? '';
$passwordConfirm = $_POST['password_confirm'] ?? '';
$user = $this->user->findByResetToken($token);
if (!$user) {
Flash::set('error', 'Invalid or expired reset link.');
header('Location: /login');
return;
}
if (\strlen($password) < 8) {
Flash::set('error', 'Password must be at least 8 characters.');
header('Location: /reset-password?token=' . urlencode($token));
return;
}
if ($password !== $passwordConfirm) {
Flash::set('error', 'Passwords do not match.');
header('Location: /reset-password?token=' . urlencode($token));
return;
}
$this->user->updatePassword($user['id'], $password);
Flash::set('success', 'Password updated! You can now log in.');
header('Location: /login');
}
}
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