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https://issues.apache.org/jira/browse/PDFBOX-5772?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17818551#comment-17818551
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Tilman Hausherr edited comment on PDFBOX-5772 at 2/19/24 5:57 PM:
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I can't access that DSS issue without registering, which I don't want to. In
the file there, does the /P entry of the widget point to the page? If yes, then
all I'd have to do is to make the change like this:
{code:java}
if (signatureField == null)
{
.....
}
else
{
firstWidget = signatureField.getWidgets().get(0);
sigObject.getCOSObject().setNeedToBeUpdated(true);
if (firstWidget.getPage() != null)
{
page = firstWidget.getPage();
}
}
{code}
was (Author: tilman):
I can't access that DSS issue without registering, which I don't want to. In
the file there, does the /P entry point to the page? If yes, then all I'd have
to do is to make the change like this:
{code:java}
if (signatureField == null)
{
.....
}
else
{
firstWidget = signatureField.getWidgets().get(0);
sigObject.getCOSObject().setNeedToBeUpdated(true);
if (firstWidget.getPage() != null)
{
page = firstWidget.getPage();
}
}
{code}
> Inconsistent signature page handling when signing in existing signature fields
> ------------------------------------------------------------------------------
>
> Key: PDFBOX-5772
> URL: https://issues.apache.org/jira/browse/PDFBOX-5772
> Project: PDFBox
> Issue Type: Bug
> Components: Signing
> Affects Versions: 2.0.30, 3.0.1 PDFBox
> Reporter: Michael Klink
> Priority: Major
>
> In eSig DSS issue DSS-3269 -
> [https://ec.europa.eu/digital-building-blocks/tracker/browse/DSS-3269] - it
> became apparent that {{PDDocument.addSignature(PDSignature,
> SignatureInterface, SignatureOptions)}} does not consistently handle the
> signature page while signing in existing signature fields:
> On one hand that method does look for an existing signature field of the
> given name and - if found - explicitly does not overwrite the link to the
> page of the widget. This implies that existing signature fields are supported
> as they are and are not to be re-located.
> On the other hand that method unconditionally adds the signature widget to
> the page indicated by the signature option page number.
> In the linked DSS issue this causes signing an existing signature field on
> different page than in the options to appear both on the original page and
> the option page which is not desired.
> Expected behavior would be that in case of an existing signature field and
> widget
> * either the signature option page is ignored and only the current page of
> the signature field is used
> * or the field widget consequentially is used to the signature option page,
> removing it from its original page.
> The natural option would be the former one.
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