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Signature plugin: visible digital signatures

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This commit is contained in:
Jakub Melka
2022-05-29 17:27:58 +02:00
parent c7e7b76e5b
commit b46ff4f63c
6 changed files with 380 additions and 117 deletions
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49
Pdf4QtViewerPlugins/SignaturePlugin/signatureplugin.cpp
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@ -346,15 +346,62 @@ void SignaturePlugin::onSignDigitally()
pdf::PDFObjectReference formField = builder.createFormFieldSignature(signatureName, { }, signatureDictionary);
builder.createAcroForm({ formField });
const pdf::PDFCatalog* catalog = m_document->getCatalog();
if (dialog.getSignMethod() == SignDialog::SignDigitallyInvisible)
{
const pdf::PDFCatalog* catalog = m_document->getCatalog();
if (catalog->getPageCount() > 0)
{
const pdf::PDFObjectReference pageReference = catalog->getPage(0)->getPageReference();
builder.createInvisibleFormFieldWidget(formField, pageReference);
}
}
else if (dialog.getSignMethod() == SignDialog::SignDigitally)
{
Q_ASSERT(!m_scene.isEmpty());
const pdf::PDFInteger pageIndex = *m_scene.getPageIndices().begin();
const pdf::PDFPage* page = catalog->getPage(pageIndex);
pdf::PDFContentStreamBuilder contentBuilder(page->getMediaBox().size(), pdf::PDFContentStreamBuilder::CoordinateSystem::PDF);
QPainter* painter = contentBuilder.begin();
QList<pdf::PDFRenderError> errors;
pdf::PDFTextLayoutGetter nullGetter(nullptr, pageIndex);
m_scene.drawPage(painter, pageIndex, nullptr, nullGetter, QMatrix(), errors);
pdf::PDFContentStreamBuilder::ContentStream contentStream = contentBuilder.end(painter);
QRectF boundingRect = m_scene.getBoundingBox(pageIndex);
std::vector<pdf::PDFObject> copiedObjects = builder.copyFrom({ contentStream.resources, contentStream.contents }, contentStream.document.getStorage(), true);
Q_ASSERT(copiedObjects.size() == 2);
pdf::PDFObjectReference resourcesReference = copiedObjects[0].getReference();
pdf::PDFObjectReference formReference = copiedObjects[1].getReference();
// Create form object
pdf::PDFObjectFactory formFactory;
formFactory.beginDictionary();
formFactory.beginDictionaryItem("Type");
formFactory << pdf::WrapName("XObject");
formFactory.endDictionaryItem();
formFactory.beginDictionaryItem("Subtype");
formFactory << pdf::WrapName("Form");
formFactory.endDictionaryItem();
formFactory.beginDictionaryItem("BBox");
formFactory << boundingRect;
formFactory.endDictionaryItem();
formFactory.beginDictionaryItem("Resources");
formFactory << resourcesReference;
formFactory.endDictionaryItem();
formFactory.endDictionary();
builder.mergeTo(formReference, formFactory.takeObject());
builder.createFormFieldWidget(formField, page->getPageReference(), formReference, boundingRect);
}
QString reasonText = dialog.getReasonText();
if (!reasonText.isEmpty())