Michael Klink created PDFBOX-5772:
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Summary: 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: 3.0.1 PDFBox, 2.0.30
Reporter: Michael Klink
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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