beat weisskopf created PDFBOX-4398:
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Summary: getLastSignatureDictionary modifies internal structure of
PDDocument
Key: PDFBOX-4398
URL: https://issues.apache.org/jira/browse/PDFBOX-4398
Project: PDFBox
Issue Type: Bug
Components: AcroForm
Affects Versions: 2.0.12
Reporter: beat weisskopf
If one calls PDDocument#getLastSignatureDictionary, the AcroFrom is populated
with the defaults even if not needed. This modifies the internals of the
PDDocument and therefore there are changes to be saved, even if the file is not
modified by "real" changes.
For example:
{code}
PDDocument pdfDocument = PDDocument.load(pdfBytes);
pdfDocument.getLastSignatureDictionary();
{code}
This calls the verifyOrCreateDefaults() method, which initializes the
DR-Dictionary if not yet done. This is even done if getLastSignatureDictionary
returns null.
Why this bothers me: it is very unexpected behaviour that a getter modifies an
objects state. This is no big deal for our usecase, the other issue
(PDFBOX-4303) was a bigger problem as we are diffing objects between revisions
(current vs last signed revision).
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