<refactor, style>(gpg, ui, project): tidy up codes and comments.

1. let GpgInfo get into namespace GpgFrontend.
2. adjust the code structure.
3. add license statement to project configuration file.

1 files changed, 173 insertions, 0 deletions

diff --git a/src/ui/import_export/ExportKeyPackageDialog.cpp b/src/ui/import_export/ExportKeyPackageDialog.cpp
new file mode 100644
index 00000000..1317c1e6
--- /dev/null
+++ b/src/ui/import_export/ExportKeyPackageDialog.cpp
@@ -0,0 +1,173 @@
+/**
+ * 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
+ *
+ */
+
+#include "ExportKeyPackageDialog.h"
+
+#include <boost/format.hpp>
+
+#include "gpg/function/GpgKeyGetter.h"
+#include "gpg/function/GpgKeyImportExporter.h"
+#include "ui_ExportKeyPackageDialog.h"
+
+GpgFrontend::UI::ExportKeyPackageDialog::ExportKeyPackageDialog(
+    KeyIdArgsListPtr key_ids, QWidget* parent)
+    : QDialog(parent),
+      ui_(std::make_shared<Ui_exportKeyPackageDialog>()),
+      key_ids_(std::move(key_ids)),
+      mt_(rd_()) {
+  ui_->setupUi(this);
+
+  generate_key_package_name();
+
+  connect(ui_->gnerateNameButton, &QPushButton::clicked, this,
+          [=]() { generate_key_package_name(); });
+
+  connect(ui_->setOutputPathButton, &QPushButton::clicked, this, [=]() {
+    auto file_name = QFileDialog::getSaveFileName(
+        this, _("Export Key Package"), ui_->nameValueLabel->text() + ".gfepack",
+        QString(_("Key Package")) + " (*.gfepack);;All Files (*)");
+    ui_->outputPathLabel->setText(file_name);
+  });
+
+  connect(ui_->generatePassphraseButton, &QPushButton::clicked, this, [=]() {
+    passphrase_ = generate_passphrase(256);
+    auto file_name = QFileDialog::getSaveFileName(
+        this, _("Export Key Package Passphrase"),
+        ui_->nameValueLabel->text() + ".key",
+        QString(_("Key File")) + " (*.key);;All Files (*)");
+    ui_->passphraseValueLabel->setText(file_name);
+    write_buffer_to_file(file_name.toStdString(), passphrase_);
+  });
+
+  connect(ui_->button_box_, &QDialogButtonBox::accepted, this, [=]() {
+    if (ui_->outputPathLabel->text().isEmpty()) {
+      QMessageBox::critical(
+          this, _("Forbidden"),
+          _("Please select an output path before exporting."));
+      return;
+    }
+
+    if (ui_->passphraseValueLabel->text().isEmpty()) {
+      QMessageBox::critical(
+          this, _("Forbidden"),
+          _("Please generate a password to protect your key before exporting, "
+            "it is very important. Don't forget to back up your password in a "
+            "safe place."));
+      return;
+    }
+
+    auto key_id_exported = std::make_unique<KeyIdArgsList>();
+    auto keys = GpgKeyGetter::GetInstance().GetKeys(key_ids_);
+    for (const auto& key : *keys) {
+      if (ui_->noPublicKeyCheckBox->isChecked() && !key.IsPrivateKey()) {
+        continue;
+      }
+      key_id_exported->push_back(key.GetId());
+    }
+
+    ByteArrayPtr key_export_data = nullptr;
+    if (!GpgKeyImportExporter::GetInstance().ExportKeys(
+            key_ids_, key_export_data,
+            ui_->includeSecretKeyCheckBox->isChecked())) {
+      QMessageBox::critical(this, _("Error"), _("Export Key(s) Failed."));
+      this->close();
+      return;
+    }
+
+    auto key = QByteArray::fromStdString(passphrase_),
+         data =
+             QString::fromStdString(*key_export_data).toLocal8Bit().toBase64();
+
+    auto hash_key = QCryptographicHash::hash(key, QCryptographicHash::Sha256);
+    QAESEncryption encryption(QAESEncryption::AES_256, QAESEncryption::ECB,
+                              QAESEncryption::Padding::ISO);
+    auto encoded = encryption.encode(data, hash_key);
+
+    write_buffer_to_file(ui_->outputPathLabel->text().toStdString(),
+                         encoded.toStdString());
+
+    QMessageBox::information(
+        this, _("Success"),
+        QString(_(
+            "The Key Package has been successfully generated and has been "
+            "protected by encryption algorithms. You can safely transfer your "
+            "Key Package.")) +
+            "<br />" + "<b>" +
+            _("But the key file cannot be leaked under any "
+              "circumstances. Please delete the Key Package and key file as "
+              "soon "
+              "as possible after completing the transfer operation.") +
+            "</b>");
+  });
+
+  connect(ui_->button_box_, &QDialogButtonBox::rejected, this,
+          [=]() { this->close(); });
+
+  ui_->nameLabel->setText(_("Key Package Name"));
+  ui_->selectOutputPathLabel->setText(_("Output Path"));
+  ui_->passphraseLabel->setText(_("Passphrase"));
+  ui_->tipsLabel->setText(
+      _("Tips: You can use Key Package to safely and conveniently transfer "
+        "your public and private keys between devices."));
+  ui_->generatePassphraseButton->setText(_("Generate and Save Passphrase"));
+  ui_->gnerateNameButton->setText(_("Generate Key Package Name"));
+  ui_->setOutputPathButton->setText(_("Select Output Path"));
+
+  ui_->includeSecretKeyCheckBox->setText(
+      _("Include secret key (Think twice before acting)"));
+  ui_->noPublicKeyCheckBox->setText(
+      _("Exclude keys that do not have a private key"));
+
+  setAttribute(Qt::WA_DeleteOnClose);
+  setWindowTitle(_("exportKeyPackageDialog"));
+}
+
+std::string GpgFrontend::UI::ExportKeyPackageDialog::generate_passphrase(
+    const int len) {
+  std::uniform_int_distribution<int> dist(999, 99999);
+  static const char alphanum[] =
+      "0123456789"
+      "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+      "abcdefghijklmnopqrstuvwxyz";
+  std::string tmp_str;
+  tmp_str.reserve(len);
+
+  for (int i = 0; i < len; ++i) {
+    tmp_str += alphanum[dist(mt_) % (sizeof(alphanum) - 1)];
+  }
+
+  return tmp_str;
+}
+
+void GpgFrontend::UI::ExportKeyPackageDialog::generate_key_package_name() {
+  std::uniform_int_distribution<int> dist(999, 99999);
+  auto file_string = boost::format("KeyPackage_%1%") % dist(mt_);
+  ui_->nameValueLabel->setText(file_string.str().c_str());
+  ui_->outputPathLabel->clear();
+  ui_->passphraseValueLabel->clear();
+}