cool#9992 lok doc sign: async DocumentDigitalSignatures::ImplViewSignatures()

Currently SfxObjectShell::CheckIsReadonly() has a hack for the LOK case
to show the signatures dialog read-only, as only that is async.

The next step is to make DocumentDigitalSignatures::ImplViewSignatures()
async, though that requires all callers of the function to be async, so
make DocumentDigitalSignatures::signScriptingContent() async as well.
There is also DocumentDigitalSignatures::signPackage(), but turns out
that's dead code, so just remove it.

Once this is in place, we had a problem that the callbacks tried to
interact with libxmlsec, but the dialog was still alive in
DocumentDigitalSignatures::ImplViewSignatures() by the time the callback
was running, so there were two DocumentSignatureManager instances at the
same time, and both assumes it should call the global libxmlsec
init/uninit, which resulted in failing to verify the just created
signature.

Fix this similar to how Tomaz fixed the same problem around pdfium in
commit 067a8a954c8e1d8d6465a4ab5fb61e93f16c26c2 (pdfium: only init
pdfium library one and destroy on LO exit, 2020-06-03).

Change-Id: I3fb63c06195564732e1576dbd755157e676fb762
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/173117
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/xmlsecurity/inc/documentsignaturemanager.hxx b/xmlsecurity/inc/documentsignaturemanager.hxx
index ab89e5b96674..9f0c5d61f9e2 100644
--- a/xmlsecurity/inc/documentsignaturemanager.hxx
+++ b/xmlsecurity/inc/documentsignaturemanager.hxx
@@ -54,6 +54,7 @@ class XComponentContext;
 }
 }
 class PDFSignatureHelper;
+class Xmlsec;
 
 /// Manages signatures (addition, removal), used by DigitalSignaturesDialog.
 class XMLSECURITY_DLLPUBLIC DocumentSignatureManager
@@ -75,6 +76,7 @@ private:
     css::uno::Reference<css::xml::crypto::XXMLSecurityContext> mxSecurityContext;
     css::uno::Reference<css::xml::crypto::XSEInitializer> mxGpgSEInitializer;
     css::uno::Reference<css::xml::crypto::XXMLSecurityContext> mxGpgSecurityContext;
+    std::shared_ptr<Xmlsec> mpXmlsecLibrary;
 
 public:
     DocumentSignatureManager(const css::uno::Reference<css::uno::XComponentContext>& xContext,