[jira] [Created] (PDFBOX-4066) Flatten pdf does not remove acroform elements (checkboxes)

["Al Phaba (JIRA)" <ji...@apache.org>]

Al Phaba created PDFBOX-4066:
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             Summary: Flatten pdf does not remove acroform elements (checkboxes)
                 Key: PDFBOX-4066
                 URL: https://issues.apache.org/jira/browse/PDFBOX-4066
             Project: PDFBox
          Issue Type: Bug
          Components: AcroForm, Utilities
    Affects Versions: 2.0.8
            Reporter: Al Phaba
         Attachments: TestForm.pdf, flattenAndMerge.pdf

I have a pdf with a lot of acroforms, I do some manipulation on it which results in a new pdf. So I have PDF-1 (which is the original one )and PDF-2 (just a duplication of PDF-1), now I want to merge them. Both PDFs have some acroforms for example: field_a, field_2...

Before I merge them I flatten PDF-1, because I only want to have acrofields from PDF-2. When I check then my new merged PDF I can see that there are no visible fields on on the pages from PDF-1 and there are fields on pages of fields of PDF-2. At the first look it seems ok, but when I inspect the fields I can see that the merger has renamed all the fields for PDF-2 e.g. field_a_dummy123, field_b_dummy232 ...

It seems to me, that flattening does not remove the fields and thats why the PDFMerger from PDFBox will rename the fields for PDF-2 because acrofields need to be unique.Another guess was that there is a bug in mergeAcroForm()

 
{code:java}
@Test
public void flattenAndMerge() throws IOException {
    File testForm = new File(classLoader.getResource("./TestForm.pdf").getFile());

    byte[] testFormAsByte = Files.readAllBytes(testForm.toPath());
    byte[] testFormAsByte2 = Files.readAllBytes(testForm.toPath());

    PDDocument pdf1 = PDDocument.load(testFormAsByte);
    PDAcroForm acroform = pdf1.getDocumentCatalog().getAcroForm();
    acroform.flatten();
    Path flattendedPdf = Files.createTempFile("flatten", ".pdf");
    pdf1.save(flattendedPdf.toFile());


    PDFMergerUtility merger = new PDFMergerUtility();
    merger.addSource(new ByteArrayInputStream(Files.readAllBytes(flattendedPdf)));
    merger.addSource(new ByteArrayInputStream(testFormAsByte2));
    merger.setDestinationFileName("./build/flattenAndMerge.pdf");
    merger.mergeDocuments(MemoryUsageSetting.setupMainMemoryOnly());

}
{code}
Here is my SO Article

[https://stackoverflow.com/questions/48271924/pdfbox-flatten-pdf-does-not-remove-acroform-elements?noredirect=1#comment83544858_48271924]

 

 



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