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+/**
+ * Copyright (C) 2021 Saturneric
+ *
+ * This file is part of GpgFrontend.
+ *
+ * GpgFrontend is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GpgFrontend is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GpgFrontend. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * The initial version of the source code is inherited from
+ * the gpg4usb project, which is under GPL-3.0-or-later.
+ *
+ * All the source code of GpgFrontend was modified and released by
+ * Saturneric<[email protected]> starting on May 12, 2021.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ */
+
+#ifndef GPGFRONTEND_DATAOBJECTOPERATOR_H
+#define GPGFRONTEND_DATAOBJECTOPERATOR_H
+
+#include <json/single_include/nlohmann/json.hpp>
+
+#include "core/GpgFrontendCore.h"
+#include "core/GpgFunctionObject.h"
+#include "core/function/GlobalSettingStation.h"
+
+namespace GpgFrontend {
+
+class DataObjectOperator : public SingletonFunctionObject<DataObjectOperator> {
+ public:
+  /**
+   * @brief DataObjectOperator constructor
+   *
+   * @param channel channel
+   */
+  explicit DataObjectOperator(
+      int channel = SingletonFunctionObject::GetDefaultChannel());
+
+  std::string SaveDataObj(const std::string &_key, const nlohmann::json &value);
+
+  std::optional<nlohmann::json> GetDataObject(const std::string &_key);
+
+  std::optional<nlohmann::json> GetDataObjectByRef(const std::string &_ref);
+
+ private:
+  /**
+   * @brief init the secure key of application data object
+   *
+   */
+  void init_app_secure_key();
+
+  GlobalSettingStation &global_setting_station_ =
+      GlobalSettingStation::GetInstance();  ///< GlobalSettingStation
+  std::filesystem::path app_secure_path_ =
+      global_setting_station_.GetAppConfigPath() /
+      "secure";  ///< Where sensitive information is stored
+  std::filesystem::path app_secure_key_path_ =
+      app_secure_path_ / "app.key";  ///< Where the key of data object is stored
+  std::filesystem::path app_data_objs_path_ =
+      global_setting_station_.GetAppDataPath() / "data_objs";  ///< Where data
+                                                               ///< object is
+                                                               ///< stored
+
+  std::random_device rd_;                  ///< Random device
+  std::mt19937 mt_ = std::mt19937(rd_());  ///< Mersenne twister
+  QByteArray hash_key_;                    ///< Hash key
+};
+
+}  // namespace GpgFrontend
+
+#endif  // GPGFRONTEND_DATAOBJECTOPERATOR_H