Hi Randolph,
i don't think, you can use the PdfCopy-class as you need to add an AcroForm
to your Output-PDF. I use PdfWriter for this.
Have a look at the code attached to produce the template for the Output-PDF.
The signature has to be an indirect object.
Therefore I added a method to PdfFormField:
public void setValueIndirect(PdfSignature aPdfSignature) throws IOException
{
PdfIndirectObject aIndirectSig = writer.addToBody(aPdfSignature);
PdfIndirectReference aIndirectSigReference =
aIndirectSig.getIndirectReference();
put(PdfName.V, aIndirectSigReference);
}
Hopefully the other unresolved methods in the code below are
self-explanatory.
Best regards,
Peter
P.S.: a hidden signature is invisible in the PDF-Text, but in the special
"signature"-tab
of Acrobat Reader left of the PDF-text you can look at all the signature
details.
Here's the code:
protected byte [] writeTemplatePDF(byte [] byteInPDF,
String strSigFieldName, float
llx, float lly, float urx, float ury,
PdfSignature2 aPdfSignature)
{ ByteArrayOutputStream aStream = new ByteArrayOutputStream();
Document document = null;
PdfWriter aWriter = null;
PdfReader reader = new PdfReader(byteInPDF);
char chPdfVersion = reader.getPdfVersion();
if (reader.isEncrypted())
{
throw new DocumentException("Input-PDF for digitally signing
may not be
encrypted.");
}
int n = reader.getNumberOfPages();
PRAcroForm aAcroForm = reader.getAcroForm();
if (null != aAcroForm)
{
throw new DocumentException("Input-PDF for digitally signing
may not
contain an AcroForm.");
}
document = new Document(reader.getPageSizeWithRotation(1));
aWriter = PdfWriter.getInstance(document, aStream);
// the PDF Version of the input PDF is set here, too
aWriter.setPdfVersion(chPdfVersion);
if (mfEncryptionActive)
{
aWriter.setEncryption(mBytesUserPassword, mBytesOwnerPassword,
mPermissions,
mfStrength128Bits);
}
document.open();
PdfContentByte cb = aWriter.getDirectContent();
PdfAcroForm acroForm = aWriter.getAcroForm();
// copy all pages
PdfImportedPage page;
for (int i = 1; i <= n; i++ )
{
document.newPage();
page = aWriter.getImportedPage(reader, i);
if (1 == i)
{
if (null != acroForm)
{
if (isHidden())
{
// The signature should not be shown.
We don't need all that layer
stuff
PdfFormField aSignatureField =
PdfFormField.createSignature(aWriter);
acroForm.setSignatureParams(aSignatureField, name, llx, lly, urx,
ury);
acroForm.drawSignatureAppearencesHidden(aSignatureField, llx, lly,
urx, ury);
acroForm.addFormField(aSignatureField);
aSignatureField.setValueIndirect((PdfSignature)aPdfSignature);
acroForm.setSigFlags(PdfWriter.SIGNATURE_APPEND_ONLY |
PdfWriter.SIGNATURE_EXISTS);
}
else
{
throw new DocumentException("Visible
Signatures are not yet
implemented.");
}
}
}
cb.addTemplate(page, 0f, 0f);
}
document.close();
aStream.close();
return aStream.toByteArray();
}
-----Urspr�ngliche Nachricht-----
Von: DI Randolph Kepplinger [mailto:[EMAIL PROTECTED]
Gesendet: Dienstag, 15. Juni 2004 12:20
An: Peter Soelter
Cc: [EMAIL PROTECTED]
Betreff: Re: [iText-questions] signature problem with attached document
hello!
> You can use the PdfAcroForm for this.
>
> PdfAcroForm acroForm = aWriter.getAcroForm();
>
> and
>
> PdfFormField.createSignature(PdfWriter writer);
i don't understand this.
what i did is
// build the signature
PdfSignature pdfs=new PdfSignature("Adobe.PPKLite");
...
pdfs.setString("ByteRange",new String(brange));
pdfs.setSubFilter("adbe.pkcs7.detached");
sig=bytesToHex(sig).getBytes();
pdfs.setContents(sig);
pdfs.setName("10.10.10.200");
pdfs.put(PdfName.TYPE, new PdfName("Sig"));
...
// read and copy the object
reader=new PdfReader(INFILE);
n = reader.getNumberOfPages();
document = new Document(reader.getPageSizeWithRotation(1));
baos=new ByteArrayOutputStream();
writer = new PdfCopy(document, new
FileOutputStream("outfileunsigned.pdf"));
document.open();
for (int i = 0; i < n; ) {
++i;
page = writer.getImportedPage(reader, i);
writer.addPage(page);
System.out.println("Processed page " + i);
}
form = reader.getAcroForm();
if (form != null)
{
System.err.println("COPYING FORM!!!!");
writer.copyAcroForm(reader);
}
// here i add the signature
writer.addToBody( pdfs );
document.close();
// after this i manipulate the byte-array
how can i use
PdfAcroForm acroForm = writer.getAcroForm();
PdfFormField.createSignature(writer);
instead or additional?
i have build a signature object, is this useless for adding a formfield?
> With the standard implementation of iText you can generate
> a hidden signature (x,y,dx,dy all 0).
what is a hidden signature, does this mean it never shows in acrobat? what
is this good for?
> But to create a visible signature you'll have to do a lot more. I
> didn't manage to do it (luckily it wasn't a requirement in my case).
i dont need to see the signature like a watermark, but when i go to the
acrobat menu signatures, i'd like to see it.
regards
randolph
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