Hello PDFBOX team,
We are digital signing pdf and want to add validity symbol layer (green tick)
but it should only be visible on pdf reader and not on any browser screen.
We achieved same using itextsharp by manipulating n1,n3 and n4 layer- attached
is reference code. same we want to achieve using pdfbox and java.
Any update on this will be helpful.
Thanks and Regards,
Urmi Vijayvargiy
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public void ClearValidityLayer(byte[] data, string dest)
{
using (PdfReader pdfReader = new PdfReader(data))
using (PdfStamper pdfStamper = new PdfStamper(pdfReader,
new FileStream(dest, FileMode.Create, FileAccess.Write), '\0',
true))
{
AcroFields fields = pdfStamper.AcroFields;
List<string> names = fields.GetSignatureNames();
foreach (string name in names)
{
PdfDictionary normal =
PdfReader.GetPdfObject(fields.GetNormalAppearance(name)) as PdfDictionary;
PdfDictionary frm =
normal?.GetAsDict(PdfName.RESOURCES)?.GetAsDict(PdfName.XOBJECT)
?.GetAsStream(PdfName.FRM);
PdfDictionary frmResources =
frm?.GetAsDict(PdfName.RESOURCES);
PdfDictionary frmXobjectResources =
frmResources?.GetAsDict(PdfName.XOBJECT);
if (frmXobjectResources != null)
{
Console.WriteLine("Found XObject resources of FRM
XObject");
clearLayer(pdfStamper.Writer, frmXobjectResources,
PdfName.N1);
clearLayer(pdfStamper.Writer, frmXobjectResources,
PdfName.N3);
clearLayer(pdfStamper.Writer, frmXobjectResources,
PdfName.N4);
pdfStamper.MarkUsed(frmXobjectResources);
pdfStamper.MarkUsed(frmResources);
pdfStamper.MarkUsed(frm);
}
}
}
}
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