Decrypt application

PdfTool/pdftooldecrypt.cpp

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+//    Copyright (C) 2021 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 "pdftooldecrypt.h"
+#include "pdfdocumentbuilder.h"
+#include "pdfdocumentwriter.h"
+
+namespace pdftool
+{
+
+static PDFToolDecryptApplication s_decryptApplication;
+
+QString PDFToolDecryptApplication::getStandardString(StandardString standardString) const
+{
+    switch (standardString)
+    {
+        case Command:
+            return "decrypt";
+
+        case Name:
+            return PDFToolTranslationContext::tr("Decrypt");
+
+        case Description:
+            return PDFToolTranslationContext::tr("Remove encryption from a document (with only owner access only).");
+
+        default:
+            Q_ASSERT(false);
+            break;
+    }
+
+    return QString();
+}
+
+int PDFToolDecryptApplication::execute(const PDFToolOptions& options)
+{
+    pdf::PDFDocument document;
+    QByteArray sourceData;
+    if (!readDocument(options, document, &sourceData, true))
+    {
+        if (readDocument(options, document, &sourceData, false))
+        {
+            PDFConsole::writeError(PDFToolTranslationContext::tr("Authorization as owner failed. Encryption removal is not permitted if authorized as user only."), options.outputCodec);
+        }
+        return ErrorDocumentReading;
+    }
+
+    if (document.getStorage().getSecurityHandler()->getMode() == pdf::EncryptionMode::None)
+    {
+        PDFConsole::writeError(PDFToolTranslationContext::tr("Document is not encrypted."), options.outputCodec);
+        return ExitSuccess;
+    }
+
+    pdf::PDFDocumentBuilder builder(&document);
+    builder.removeEncryption();
+    builder.setSecurityHandler(pdf::PDFSecurityHandlerPointer(new pdf::PDFNoneSecurityHandler()));
+    document = builder.build();
+
+    pdf::PDFDocumentWriter writer(nullptr);
+    pdf::PDFOperationResult result = writer.write(options.document, &document, true);
+
+    if (!result)
+    {
+        PDFConsole::writeError(result.getErrorMessage(), options.outputCodec);
+        return ErrorDocumentWriting;
+    }
+
+    return ExitSuccess;
+}
+
+PDFToolAbstractApplication::Options PDFToolDecryptApplication::getOptionsFlags() const
+{
+    return ConsoleFormat | OpenDocument;
+}
+
+}   // namespace pdftool