Converting PDF to PDF/A-1a results in PDF/A-1b document instead on `:edge`

[stumpylog]

Converting PDF to PDF/A-1a results in PDF/A-1b document instead on `:edge`

[stumpylog]

On 7.10.1, using --form 'pdfa=PDF/A-1a' --form 'pdfua=true' results in a A1 file. leaving off pdfua also results in an A1 file. Setting pdfua=false is also an A1 file. So 7.10.1 is always returning an A1 file from this route when requested.

[stumpylog]

The resulting file:
result.pdf

[gulien]

Thanks for testing the edge release!
Gotenberg still call LibreOffice in the same manner as before, so I guess something happened upstream. A new LibreOffice version that introduced a bug?

[gulien]

LibreOffice versions:

• 7.10.1 = LibreOffice 7.5.8.2 50(Build:2)
• edge = LibreOffice 7.6.4.1 60(Build:1)

[gulien]

The 7.6 release notes:

Export to PDF v.1.7 by default. core commit e624e (Michael Stahl, allotropia)
Tagged PDF is now produced by default, for improved accessibility. (To further improve your PDF's accessibility, the PDF/UA option is available in the export dialog and will trigger the Accessibility Check tool). tdf#39667 (Samuel Mehrbrodt, allotropia)
Exporting as a hybrid PDF now stores the original ODF document as a PDF compatible file attachment. core commit e052f (Tomaž Vajngerl, Collabora)
Fix glyph size mismatch and overlap when printing of variable fonts. tdf#156151 (Khaled Hosny, TDF)
Fix missing or incorrect overline color when exporting to PDF. tdf#48707 (Khaled Hosny, TDF)
Fix position of CJK emphasis marks when exporting to PDF. tdf#115321 (Khaled Hosny, TDF)
Fix blank text for the default instance of CFF2 variable fonts when exporting to PDF. tdf#155161 (Khaled Hosny, TDF)
Fix underline position of Liberation fonts when exporting to PDF. tdf#154235 (Khaled Hosny, TDF)

I don't see any changes here nor in the linked commits that could explain our issue.

@stumpylog could you try to set pdfua to true with Gotenberg 7.10.1 to check if it returns PDF/A-1b instead of PDF/A-1a?

[gulien]

Looks like an upstream bug, thanks 👍

[gulien]

So it's actually not a bug: https://git.libreoffice.org/core/+/c4b12d06698402984b3ffdbd2c139f261fa35ca1%5E%21.
Long story short, LibreOffice stated that it was producing PDF/A-1a PDF, which was true for simple documents, but most of the time it was actually producing PDF/A-1b. Because of some metadata, some validators were still seeing those as PDF/A-1a compliant, where in fact it was not the case.

See also https://bugs.documentfoundation.org/show_bug.cgi?id=153472.

I guess I have to update the "valid" PDF/A versions handled by Gotenberg.