[okular] [Bug 473415] New: Cannot see any signature information for a signed PDF

[Hugo Osvaldo Barrera]

https://bugs.kde.org/show_bug.cgi?id=473415

            Bug ID: 473415
           Summary: Cannot see any signature information for a signed PDF
    Classification: Applications
           Product: okular
           Version: 23.04.3
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel at kde.org
          Reporter: hugo at whynothugo.nl
  Target Milestone: ---

Created attachment 160980
  --> https://bugs.kde.org/attachment.cgi?id=160980&action=edit
PDF mentioned in the issue description

SUMMARY

I have received a signed PDF document. This document is signed with a
certificate that is signed by a CA operate by the Argentinian government (and
is not bundled by default on any distribution or browser).
When I open the PDF on Okular, it merely states "Some of the signatures could
not be validated properly". 

The reason that I am opening the file with Okular is to check the signature,
but no details are shown anywhere. E.g.: Okular validates the signature for me,
but won't display it, nor the certificate associated with it, nor any
information related to it. The main issue here is that the "View certificate"
button is disabled, but there is no indication why (am I missing an optional
dependency?).

The only output that okular is providing is unrelated:

> okular Afirmar_signed.pdf 
kf.windowsystem: Could not find any platform plugin
QWidget::setMinimumSize: (okular_sidebar/Sidebar) Negative sizes (0,-1) are not
possible
qt.qpa.wayland: setGrabPopup called with a parent,
QtWaylandClient::QWaylandXdgSurface(0x7fdc917f5670) which does not match the
current topmost grabbing popup,
QtWaylandClient::QWaylandXdgSurface(0x7fdc82abea90) According to the xdg-shell
protocol, this is not allowed. The wayland QPA plugin is currently handling it
by setting the parent to the topmost grabbing popup. Note, however, that this
may cause positioning errors and popups closing unxpectedly because xdg-shell
mandate that child popups close before parents

OBSERVED RESULT

No details on the PDF's signature are visible. No details on the certificate
that signed it are visible.

EXPECTED RESULT

I should be able to see the PDF and details on its signature.

SOFTWARE/OS VERSIONS
Windows: no
macOS: no
Linux/KDE Plasma: no
KDE Plasma Version: no
KDE Frameworks Version: no
Qt Version: qt5-qtbase-5.15.10

I'm using okular 23.04.3 on Alpine-Edge.

Originally reported at: https://invent.kde.org/graphics/okular/-/issues/82

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