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diff --git a/src/core/function/gpg/GpgKeyGroupGetter.h b/src/core/function/gpg/GpgKeyGroupGetter.h
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+++ b/src/core/function/gpg/GpgKeyGroupGetter.h
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+/**
+ * Copyright (C) 2021-2024 Saturneric <[email protected]>
+ *
+ * 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
+ *
+ */
+
+#pragma once
+
+#include "core/function/CacheManager.h"
+#include "core/function/basic/GpgFunctionObject.h"
+#include "core/function/gpg/GpgContext.h"
+#include "core/model/GpgKeyGroup.h"
+
+namespace GpgFrontend {
+
+struct GpgKeyGroupTreeNode {
+  QContainer<GpgKeyGroupTreeNode*> parents;
+  QContainer<GpgKeyGroupTreeNode*> children;
+  QSharedPointer<GpgKeyGroup> key_group;
+
+  // over take
+  QStringList non_key_group_ids;
+
+  /**
+   * @brief Construct a new Gpg Key Group Tree Node object
+   *
+   */
+  GpgKeyGroupTreeNode() = default;
+
+  /**
+   * @brief Construct a new Gpg Key Group Tree Node object
+   *
+   * @param kg
+   */
+  explicit GpgKeyGroupTreeNode(GpgKeyGroup kg);
+
+  /**
+   * @brief
+   *
+   */
+  void Apply();
+
+  /**
+   * @brief
+   *
+   * @param key
+   * @return true
+   * @return false
+   */
+  auto AddNonKeyGroupKey(const GpgAbstractKeyPtr& key) -> bool;
+
+  /**
+   * @brief
+   *
+   * @param target
+   * @return true
+   * @return false
+   */
+  auto HasAncestor(GpgKeyGroupTreeNode* target) -> bool;
+
+  /**
+   * @brief
+   *
+   * @param target
+   * @return true
+   * @return false
+   */
+  auto AddChildren(GpgKeyGroupTreeNode* target) -> bool;
+
+  /**
+   * @brief
+   *
+   * @param target
+   * @return true
+   * @return false
+   */
+  auto RemoveChildren(GpgKeyGroupTreeNode* target) -> bool;
+
+  /**
+   * @brief
+   *
+   * @param key
+   * @return true
+   * @return false
+   */
+  auto RemoveNonKeyGroupKey(const QString& key) -> bool;
+};
+
+class GPGFRONTEND_CORE_EXPORT GpgKeyGroupGetter
+    : public SingletonFunctionObject<GpgKeyGroupGetter> {
+ public:
+  /**
+   * @brief GpgKeyGroupGetter constructor
+   *
+   * @param channel channel
+   */
+  explicit GpgKeyGroupGetter(
+      int channel = SingletonFunctionObject::GetDefaultChannel());
+
+  /**
+   * @brief
+   *
+   * @return QContainer<GpgKeyGroup>
+   */
+  auto Fetch() -> QContainer<QSharedPointer<GpgKeyGroup>>;
+
+  /**
+   * @brief
+   *
+   * @return QContainer<GpgKeyGroup>
+   */
+  auto FlushCache() -> bool;
+
+  /**
+   * @brief
+   *
+   */
+  void AddKeyGroup(const GpgKeyGroup&);
+
+  /**
+   * @brief
+   *
+   * @param id
+   * @param key
+   * @return true
+   * @return false
+   */
+  auto AddKey2KeyGroup(const QString& id, const GpgAbstractKeyPtr& key) -> bool;
+
+  /**
+   * @brief
+   *
+   * @param id
+   * @param key
+   * @return true
+   * @return false
+   */
+  auto RemoveKeyFromKeyGroup(const QString& id, const QString& key_id) -> bool;
+
+  /**
+   * @brief
+   *
+   * @param id
+   */
+  void Remove(const QString& id);
+
+  /**
+   * @brief
+   *
+   * @param id
+   */
+  auto KeyGroup(const QString& id) -> QSharedPointer<GpgKeyGroup>;
+
+ private:
+  GpgContext& ctx_ =
+      GpgContext::GetInstance(SingletonFunctionObject::GetChannel());
+  CacheManager& cm_ =
+      CacheManager::GetInstance(SingletonFunctionObject::GetChannel());
+
+  QMap<QString, QSharedPointer<GpgKeyGroupTreeNode>> key_groups_forest_;
+
+  /**
+   * @brief
+   *
+   */
+  void fetch_key_groups();
+
+  /**
+   * @brief
+   *
+   */
+  void persist_key_groups();
+
+  /**
+   * @brief
+   *
+   */
+  void check_all_key_groups();
+
+  /**
+   * @brief
+   *
+   */
+  void check_key_group(const QSharedPointer<GpgKeyGroup>&);
+
+  /**
+   * @brief
+   *
+   */
+  void build_gpg_key_group_tree();
+};
+
+}  // namespace GpgFrontend