Signatures order

[Andrea Canu <an...@gmail.com>]

Hi guys.

Which is the correct way to sort Signatures by revisions order?

With some signed documents the PdfBox method:

PDDocument.getSignatureDictionaries()

returns a Signatures list sorted by a different order from the signed
revisions order.

Is there a simple way to get the signed revision ordinal ?


Thanks in advance

Andrea

On Thu, May 26, 2016 at 5:26 PM, Maruan Sahyoun <sa...@fileaffairs.de>
wrote:

> Hi,
>
>
> > Am 26.05.2016 um 14:26 schrieb Andrea Canu <an...@gmail.com>:
> >
> > Hi all.
> >
> > I'm tying to rewrite my code in order to use the PDFBox in place of the
> > current library.
> > First of all, thank you for the great work you are doing!
> >
> >
> > I'm trying to manage signatures of a PDFdocuments and the method that I
> use
> > to obtain the Signatures' list from the PDDocument is:
> >
> > public List<PDSignature> *getSignatureDictionaries *() throws IOException
> >
> > I'm in trouble with a specific signed PDF document because this method
> > returns an empty signature list.
> >
> > From the PDFBox migration
> > <https://pdfbox.apache.org/2.0/migration.html>documentation
> > I've read that for PDFBox 2.0.0 and the PDNonTerminalField class the
> > preferred way to iterate through the fields is:
> >
> > PDAcroForm form;...for (PDField field : form.getFieldTree()){
> >    ... (do something)}
> >
> >
> > Looking inside on the *getSignatureDictionaries *'s code I was very
> > surprised to see that the AcroField was iterated with this code:
> >
> > public List<PDSignatureField> *getSignatureFields*() throws IOException
> > {
> >    List<PDSignatureField> fields = new ArrayList<PDSignatureField>();
> >    PDAcroForm acroForm = getDocumentCatalog().getAcroForm();
> >    if (acroForm != null)
> >    {
> >        // fixme: non-terminal fields are ignored, could have
> > descendant signatures
> >        for (PDField field : *acroForm*.*getFields*())
> >        {
> >            if (field instanceof PDSignatureField)
> >            {
> >                fields.add((PDSignatureField)field);
> >            }
> >        }
> >    }
> >    return fields;
> > }
> >
> >
> > I modified that *getSignatureFields *method replecing the
> > *acroForm.getFields()* call with the suggested *acroForm.getFieldTree()*
> > and all the signatures are revealed.
>
> You are correct that the code only resturns top level signature fields and
> not ones which are descendants.
>
> I've created https://issues.apache.org/jira/browse/PDFBOX-3364 to imrpove
> that.
>
> BR
> Maruan
>
> >
> > The question is:
> > Is that a forgetfulness of the 2.0 migration or is my workaround
> incorrect
> > to solve that issue?
> >
> >
> > Kind regard
> >
> > Andrea
>
>
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