Signature plugin: sign dialog + verification

Pdf4QtViewerPlugins/SignaturePlugin/signdialog.cpp

@@ -0,0 +1,90 @@
+//    Copyright (C) 2022 Jakub Melka
+//
+//    This file is part of PDF4QT.
+//
+//    PDF4QT is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU Lesser General Public License as published by
+//    the Free Software Foundation, either version 3 of the License, or
+//    with the written consent of the copyright owner, any later version.
+//
+//    PDF4QT 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 Lesser General Public License for more details.
+//
+//    You should have received a copy of the GNU Lesser General Public License
+//    along with PDF4QT.  If not, see <https://www.gnu.org/licenses/>.
+
+#include "signdialog.h"
+#include "ui_signdialog.h"
+
+#include "certificatemanager.h"
+
+#include <openssl/pkcs7.h>
+
+#include <QMessageBox>
+
+namespace pdfplugin
+{
+
+SignDialog::SignDialog(QWidget* parent, bool isSceneEmpty) :
+    QDialog(parent),
+    ui(new Ui::SignDialog)
+{
+    ui->setupUi(this);
+
+    if (!isSceneEmpty)
+    {
+        ui->methodCombo->addItem(tr("Sign digitally"), SignDigitally);
+    }
+
+    ui->methodCombo->addItem(tr("Sign digitally (invisible signature)"), SignDigitallyInvisible);
+    ui->methodCombo->setCurrentIndex(0);
+
+    QFileInfoList certificates = CertificateManager::getCertificates();
+    for (const QFileInfo& certificateFileInfo : certificates)
+    {
+        ui->certificateCombo->addItem(certificateFileInfo.fileName(), certificateFileInfo.absoluteFilePath());
+    }
+}
+
+SignDialog::~SignDialog()
+{
+    delete ui;
+}
+
+SignDialog::SignMethod SignDialog::getSignMethod() const
+{
+    return static_cast<SignMethod>(ui->methodCombo->currentData().toInt());
+}
+
+QString SignDialog::getCertificatePath() const
+{
+    return ui->certificateCombo->currentData().toString();
+}
+
+void SignDialog::accept()
+{
+    // Check certificate
+    if (!QFile::exists(getCertificatePath()))
+    {
+        QMessageBox::critical(this, tr("Error"), tr("Certificate does not exist."));
+        ui->certificateCombo->setFocus();
+        return;
+    }
+
+    // Check we can access the certificate
+    if (!CertificateManager::isCertificateValid(getCertificatePath(), ui->certificatePasswordEdit->text()))
+    {
+        QMessageBox::critical(this, tr("Error"), tr("Password to open certificate is invalid."));
+        ui->certificatePasswordEdit->setFocus();
+        return;
+    }
+
+    QDialog::accept();
+}
+
+}   // namespace pdfplugin
+
+
+