Thanks Tilman,
Well, here is the source code (only the visual signature bit):
// Creates the designer and set properties
PDVisibleSignDesigner sigDesigner = new PDVisibleSignDesigner(doc,
image, page);
sigDesigner.xAxis(100).yAxis(200).zoom(-50);
PDVisibleSigProperties visibleSigProp = new PDVisibleSigProperties();
visibleSigProp.setPdVisibleSignature(sigDesigner).signatureReason("Test");
// this should replace visibleSigProp.buildSignature()
PDFTemplateBuilder builder = new ExtSigBuilder();
PDFTemplateCreator creator = new PDFTemplateCreator(builder);
visibleSigProp.setVisibleSignature(creator.buildPDF(visibleSigProp.getPdVisibleSignature()));
// add VisibleSignature options to general signature options
SignatureOptions sigOpts = new SignatureOptions();
sigOpts.setVisualSignature(visibleSigProp);
sigOpts.setPage(0);
// add signature options to signature
doc.addSignature(sigDic, mySigner, sigOpts );
The class used to modify the behavior was:
// Test -> should write "Hello" on the top-left corner (adapted from
stackoverflow - String to COSName)
public class ExtSigBuilder extends PDVisibleSigBuilder
{
String fontName;
@Override
public void createImageForm(PDResources imageFormResources,
PDResources innerFormResource,
PDStream imageFormStream, PDRectangle formrect,
AffineTransform affineTransform, PDImageXObject img)
throws IOException
{
super.createImageForm(imageFormResources,
innerFormResource, imageFormStream, formrect, affineTransform, img);
PDFont font = PDType1Font.HELVETICA;
fontName =
getStructure().getImageForm().getResources().add(font).getName();
}
@Override
public void injectAppearanceStreams(PDStream
holderFormStream, PDStream innterFormStream, PDStream imageFormStream,
COSName imageObjectName, COSName imageName, COSName
innerFormName, PDVisibleSignDesigner properties)
throws IOException
{
super.injectAppearanceStreams(holderFormStream, innterFormStream,
imageFormStream, imageObjectName, imageName, innerFormName, properties);
String imgFormComment = "q " + 100 + " 0 0 50 0 0 cm /"
+ imageName + " Do Q\n";
String text = "BT /" + fontName + " 6 Tf (Hello) Tj ET\n";
appendRawCommands(getStructure().getImageFormStream().createOutputStream(),
imgFormComment + text);
}
}
When I don't use ExtSigBuilder or comment the 'appendRawCommands', I get
this: link <https://drive.google.com/open?id=0B9u-J6HILTH6UjR4NFp3bFdPMUk>
But when I try to add this visible layer, the retangle becomes blank:
link <https://drive.google.com/open?id=0B9u-J6HILTH6VWxKR1dONDBTSkU>
You said that there is no example, but can I achieve it if I'm willing
to get dirty and use low level API's? Is there a recommended
architecture I can follow to merge this on the project latter?
Thanks in advance,
Diego Azevedo
On 29/07/2016 13:54, Tilman Hausherr wrote:
Am 29.07.2016 um 15:36 schrieb Diego Azevedo:
Hello all,
I'm trying to add a visible signature to a pdf document -> So far, no
problems
But I've seen documents that add a text layer above the visible
signature that shows some of the signature details, such as location,
reason, date, the validity of the signature (and that's updated if,
for example, you trust a root certificate). I'd like to add these
features, but I didn't find any example on the SVN directory.
The closest I got was this stackoverflow question
<http://stackoverflow.com/questions/27926407/visual-signature-with-pdfbox-1-8-8>,
but that did not work for me (I changed the methods signatures to the
updated API, but all I got was a blank rectangle).
The text layer isn't supported, or rather, there is no example for it.
What you could do is to post your source code and upload the result
PDF somewhere, I'll see if I can find something.
Btw a known problem is signing rotated pages (there's an SO issue
about that too), so make sure your page isn't.
Tilman
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