setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$error = '';
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
$username = filter_input(INPUT_POST, 'username', FILTER_SANITIZE_STRING);
$password = filter_input(INPUT_POST, 'password', FILTER_SANITIZE_STRING);
if ($username && $password) {
$stmt = $db->prepare('SELECT id, password, is_moderator, login_attempts, last_attempt FROM users WHERE username = ?');
$stmt->execute([$username]);
$user = $stmt->fetch(PDO::FETCH_ASSOC);
if ($user) {
if ($user['login_attempts'] >= 5 && strtotime($user['last_attempt']) > strtotime('-15 minutes')) {
$error = 'Too many login attempts. Please try again later.';
} else if (password_verify($password, $user['password'])) {
session_regenerate_id(true);
$_SESSION['user_id'] = $user['id'];
$_SESSION['username'] = $username;
$_SESSION['is_moderator'] = $user['is_moderator'];
$stmt = $db->prepare('UPDATE users SET login_attempts = 0, last_attempt = NOW() WHERE id = ?');
$stmt->execute([$user['id']]);
header('Location: index.php');
exit;
} else {
$stmt = $db->prepare('UPDATE users SET login_attempts = login_attempts + 1, last_attempt = NOW() WHERE id = ?');
$stmt->execute([$user['id']]);
$error = 'Invalid username or password';
}
} else {
$error = 'Invalid username or password';
}
}
}
?>
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