loplugin:unocast (sfx2::DigitalSignatures)

(See the upcoming commit introducing that loplugin:unocast on why such
dynamic_casts from UNO types are dangerous.)

Change-Id: I74c76452cf7921da55462581ef48aea86f58ea18
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/144763
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

3 files changed, 33 insertions, 1 deletions

diff --git a/sfx2/Library_sfx.mk b/sfx2/Library_sfx.mk
index 7b1dee935ff3..0c1f654d4a1e 100644
--- a/sfx2/Library_sfx.mk
+++ b/sfx2/Library_sfx.mk
@@ -213,6 +213,7 @@ $(eval $(call gb_Library_add_exception_objects,sfx,\
     sfx2/source/doc/QuerySaveDocument \
     sfx2/source/doc/SfxDocumentMetaData \
     sfx2/source/doc/autoredactdialog \
+    sfx2/source/doc/digitalsignatures \
     sfx2/source/doc/docfac \
     sfx2/source/doc/docfile \
     sfx2/source/doc/docfilt \
diff --git a/sfx2/source/doc/digitalsignatures.cxx b/sfx2/source/doc/digitalsignatures.cxx
new file mode 100644
index 000000000000..73f50cde19aa
--- /dev/null
+++ b/sfx2/source/doc/digitalsignatures.cxx
@@ -0,0 +1,30 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include <sal/config.h>
+
+#include <comphelper/servicehelper.hxx>
+#include <sfx2/digitalsignatures.hxx>
+
+sal_Int64 sfx2::DigitalSignatures::getSomething(css::uno::Sequence<sal_Int8> const& aIdentifier)
+{
+    return comphelper::getSomethingImpl(aIdentifier, this);
+}
+
+css::uno::Sequence<sal_Int8> const& sfx2::DigitalSignatures::getUnoTunnelId()
+{
+    static comphelper::UnoIdInit const id;
+    return id.getSeq();
+}
+
+sfx2::DigitalSignatures::DigitalSignatures() = default;
+
+sfx2::DigitalSignatures::~DigitalSignatures() = default;
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */
diff --git a/sfx2/source/doc/docfile.cxx b/sfx2/source/doc/docfile.cxx
index c81b79e8ec4e..fdebd24107a6 100644
--- a/sfx2/source/doc/docfile.cxx
+++ b/sfx2/source/doc/docfile.cxx
@@ -78,6 +78,7 @@
 #include <comphelper/propertyvalue.hxx>
 #include <comphelper/interaction.hxx>
 #include <comphelper/sequence.hxx>
+#include <comphelper/servicehelper.hxx>
 #include <comphelper/simplefileaccessinteraction.hxx>
 #include <comphelper/string.hxx>
 #include <framework/interaction.hxx>
@@ -4008,7 +4009,7 @@ bool SfxMedium::SignDocumentContentUsingCertificate(
     uno::Reference< security::XDocumentDigitalSignatures > xSigner(
         security::DocumentDigitalSignatures::createWithVersionAndValidSignature(
             comphelper::getProcessComponentContext(), aODFVersion, bHasValidDocumentSignature ) );
-    auto xModelSigner = dynamic_cast<sfx2::DigitalSignatures*>(xSigner.get());
+    auto xModelSigner = comphelper::getFromUnoTunnel<sfx2::DigitalSignatures>(xSigner);
     if (!xModelSigner)
     {
         return bChanges;