prepare("SELECT * FROM users WHERE `key` = ? AND expires_at > NOW()");
$stmt->execute([$key]);
$user = $stmt->fetch();
if ($user) {
// 检查设备ID是否匹配
if ($user['device_id'] && $user['device_id'] !== $deviceID) {
$errorMessage = "This key is already in use on another device";
} else {
// 如果没有绑定设备ID，则绑定当前设备
if (!$user['device_id']) {
$updateStmt = $pdo->prepare("UPDATE users SET device_id = ? WHERE `key` = ?");
$updateStmt->execute([$deviceID, $key]);
}
// 设置会话
$_SESSION["user_logged"] = true;
$_SESSION["user_key"] = $key;
$_SESSION["login_time"] = time();
// 重定向到主页
header("Location: main.php");
exit;
}
} else {
$errorMessage = "Invalid key or key has expired";
}
} catch (PDOException $e) {
$errorMessage = "An error occurred during login, please try again later";
error_log("Login error: " . $e->getMessage());
}
}
// 获取上次使用的密钥（如果有）
$savedKey = $_COOKIE['last_key'] ?? '';
?>
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