tdf#103274: Add helper for a default XCommandEnvironment reference.

This helper should be used where the empty XCommandEnvironment
e.g. something like:

css::uno::Reference< css::ucb::XCommandEnvironment >()

is currently used.

See comment in the committed code (include/unotools/ucbhelper.hxx)
for details.

A case use is presented in this commit, please see:
sfx2/source/doc/docfile.cxx for details.

Change-Id: Ieb97c0ed61f31ef8df532c8be0e7ff1035327915
Reviewed-on: https://gerrit.libreoffice.org/29927
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Giuseppe Castagno <giuseppe.castagno@acca-esse.eu>

include/unotools/ucbhelper.hxx

@@ -80,6 +80,36 @@ UNOTOOLS_DLLPUBLIC bool IsSubPath(
 UNOTOOLS_DLLPUBLIC bool EqualURLs(
     OUString const & url1, OUString const & url2);
 
+/**
+* Returns a default XCommandEnvironment to be used
+* when creating a ucbhelper::Content.
+*
+* Due to the way the WebDAV UCP provider works, an interaction handler
+* is always needed:
+* 1) to activate the credential dialog or to provide the cached credentials
+* whenever the server requests them;
+*
+* 2) in case of ssl connection (https) to activate the dialog to show the
+* certificate if said certificate looks wrong or dubious.
+*
+* This helper provides the XCommandEnvironment with an interaction
+* handler that intercepts:
+* 1) css::ucb::AuthenticationRequest()
+* 2) css::ucb::CertificateValidationRequest()
+* 3) css::ucb::InteractiveIOException()
+* 4) css::ucb::UnsupportedDataSinkException()
+*
+* Exception 1) and 2) will be passed to the UI handler, e.g. shown to
+* the user for interaction.
+*
+* Exception 3) and 4) will be have a default 'Abort' result.
+* See comphelper::StillReadWriteInteraction for details.
+* comphelper::StillReadWriteInteraction was introduced in
+* commit bbe51f039dffca2506ea542feb78571b6358b981.
+*/
+UNOTOOLS_DLLPUBLIC
+    css::uno::Reference< css::ucb::XCommandEnvironment > getDefaultCommandEnvironment();
+
 } }
 
 #endif

sfx2/source/doc/docfile.cxx

@@ -394,8 +394,11 @@ util::DateTime SfxMedium::GetInitFileDate( bool bIgnoreOldValue )
     {
         try
         {
-            uno::Reference< css::ucb::XCommandEnvironment > xDummyEnv;
+            // add a default css::ucb::XCommandEnvironment
-            ::ucbhelper::Content aContent( GetURLObject().GetMainURL( INetURLObject::NO_DECODE ), xDummyEnv, comphelper::getProcessComponentContext() );
+            // in order to have the WebDAV UCP provider manage http/https authentication correctly
+            ::ucbhelper::Content aContent( GetURLObject().GetMainURL( INetURLObject::NO_DECODE ),
+                                           utl::UCBContentHelper::getDefaultCommandEnvironment(),
+                                           comphelper::getProcessComponentContext() );
 
             aContent.getPropertyValue("DateModified") >>= pImpl->m_aDateTime;
             pImpl->m_bGotDateTime = true;

unotools/source/ucbhelper/ucbhelper.cxx

@@ -25,6 +25,7 @@
 #include <com/sun/star/lang/XMultiServiceFactory.hpp>
 #include <com/sun/star/sdbc/XResultSet.hpp>
 #include <com/sun/star/task/XInteractionHandler.hpp>
+#include <com/sun/star/task/InteractionHandler.hpp>
 #include <com/sun/star/ucb/CommandAbortedException.hpp>
 #include <com/sun/star/ucb/ContentInfo.hpp>
 #include <com/sun/star/ucb/ContentInfoAttribute.hpp>
@@ -46,6 +47,7 @@
 #include <com/sun/star/util/DateTime.hpp>
 #include <comphelper/processfactory.hxx>
 #include <cppuhelper/exc_hlp.hxx>
+#include <comphelper/simplefileaccessinteraction.hxx>
 #include <osl/file.hxx>
 #include <rtl/string.h>
 #include <rtl/ustring.h>
@@ -120,6 +122,22 @@ DateTime convert(css::util::DateTime const & dt) {
 
 }
 
+css::uno::Reference< css::ucb::XCommandEnvironment > utl::UCBContentHelper::getDefaultCommandEnvironment()
+{
+    css::uno::Reference< css::task::XInteractionHandler > xIH(
+        css::task::InteractionHandler::createWithParent(
+            comphelper::getProcessComponentContext(), nullptr ) );
+
+    css::uno::Reference< css::ucb::XProgressHandler > xProgress;
+    ucbhelper::CommandEnvironment* pCommandEnv =
+        new ::ucbhelper::CommandEnvironment(
+            new comphelper::SimpleFileAccessInteraction( xIH ), xProgress );
+
+    css::uno::Reference < css::ucb::XCommandEnvironment > xEnv(
+        static_cast< css::ucb::XCommandEnvironment* >(pCommandEnv), css::uno::UNO_QUERY );
+    return xEnv;
+}
+
 bool utl::UCBContentHelper::IsDocument(OUString const & url) {
     try {
         return content(url).isDocument();