Adding upstream version 1:7.0.4.upstream/1%7.0.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 766 insertions, 0 deletions

diff --git a/unotools/source/misc/mediadescriptor.cxx b/unotools/source/misc/mediadescriptor.cxx
new file mode 100644
index 000000000..7f8f4e3c3
--- /dev/null
+++ b/unotools/source/misc/mediadescriptor.cxx
@@ -0,0 +1,766 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * 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/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <comphelper/docpasswordhelper.hxx>
+#include <sal/log.hxx>
+#include <unotools/configmgr.hxx>
+#include <unotools/mediadescriptor.hxx>
+#include <unotools/securityoptions.hxx>
+#include <unotools/ucbhelper.hxx>
+#include <comphelper/namedvaluecollection.hxx>
+#include <comphelper/stillreadwriteinteraction.hxx>
+
+#include <com/sun/star/ucb/ContentCreationException.hpp>
+#include <com/sun/star/ucb/XContent.hpp>
+#include <com/sun/star/ucb/XCommandEnvironment.hpp>
+#include <com/sun/star/task/XInteractionHandler.hpp>
+#include <com/sun/star/io/XStream.hpp>
+#include <com/sun/star/io/XActiveDataSink.hpp>
+#include <com/sun/star/io/XSeekable.hpp>
+#include <com/sun/star/lang/IllegalArgumentException.hpp>
+#include <com/sun/star/uri/UriReferenceFactory.hpp>
+#include <com/sun/star/uri/XUriReference.hpp>
+#include <com/sun/star/ucb/PostCommandArgument2.hpp>
+#include <officecfg/Office/Common.hxx>
+#include <ucbhelper/content.hxx>
+#include <ucbhelper/commandenvironment.hxx>
+#include <ucbhelper/activedatasink.hxx>
+#include <comphelper/processfactory.hxx>
+#include <tools/urlobj.hxx>
+#include <osl/diagnose.h>
+#include <tools/diagnose_ex.h>
+
+namespace utl {
+
+namespace {
+
+OUString removeFragment(OUString const & uri) {
+    css::uno::Reference< css::uri::XUriReference > ref(
+        css::uri::UriReferenceFactory::create(
+            comphelper::getProcessComponentContext())->
+        parse(uri));
+    if (ref.is()) {
+        ref->clearFragment();
+        return ref->getUriReference();
+    } else {
+        SAL_WARN("unotools.misc", "cannot parse <" << uri << ">");
+        return uri;
+    }
+}
+
+}
+
+const OUString& MediaDescriptor::PROP_ABORTED()
+{
+    static const OUString sProp("Aborted");
+    return sProp;
+}
+
+const OUString& MediaDescriptor::PROP_ASTEMPLATE()
+{
+    static const OUString sProp("AsTemplate");
+    return sProp;
+}
+
+const OUString& MediaDescriptor::PROP_COMPONENTDATA()
+{
+    static const OUString sProp("ComponentData");
+    return sProp;
+}
+
+const OUString& MediaDescriptor::PROP_DOCUMENTSERVICE()
+{
+    static const OUString sProp("DocumentService");
+    return sProp;
+}
+
+const OUString& MediaDescriptor::PROP_ENCRYPTIONDATA()
+{
+    static const OUString sProp("EncryptionData");
+    return sProp;
+}
+
+const OUString& MediaDescriptor::PROP_FILENAME()
+{
+    static const OUString sProp("FileName");
+    return sProp;
+}
+
+const OUString& MediaDescriptor::PROP_FILTERNAME()
+{
+    static const OUString sProp("FilterName");
+    return sProp;
+}
+
+const OUString& MediaDescriptor::PROP_FILTERPROVIDER()
+{
+    static const OUString aProp("FilterProvider");
+    return aProp;
+}
+
+const OUString& MediaDescriptor::PROP_FILTEROPTIONS()
+{
+    static const OUString sProp("FilterOptions");
+    return sProp;
+}
+
+const OUString& MediaDescriptor::PROP_FRAME()
+{
+    static const OUString sProp("Frame");
+    return sProp;
+}
+
+const OUString& MediaDescriptor::PROP_FRAMENAME()
+{
+    static const OUString sProp("FrameName");
+    return sProp;
+}
+
+const OUString& MediaDescriptor::PROP_HIDDEN()
+{
+    static const OUString sProp("Hidden");
+    return sProp;
+}
+
+const OUString& MediaDescriptor::PROP_INPUTSTREAM()
+{
+    static const OUString sProp("InputStream");
+    return sProp;
+}
+
+const OUString& MediaDescriptor::PROP_INTERACTIONHANDLER()
+{
+    static const OUString sProp("InteractionHandler");
+    return sProp;
+}
+
+const OUString& MediaDescriptor::PROP_AUTHENTICATIONHANDLER()
+{
+    static const OUString sProp("AuthenticationHandler");
+    return sProp;
+}
+
+ const OUString& MediaDescriptor::PROP_JUMPMARK()
+{
+    static const OUString sProp("JumpMark");
+    return sProp;
+}
+
+const OUString& MediaDescriptor::PROP_MACROEXECUTIONMODE()
+{
+    static const OUString sProp("MacroExecutionMode");
+    return sProp;
+}
+
+const OUString& MediaDescriptor::PROP_MEDIATYPE()
+{
+    static const OUString sProp("MediaType");
+    return sProp;
+}
+
+const OUString& MediaDescriptor::PROP_MINIMIZED()
+{
+    static const OUString sProp("Minimized");
+    return sProp;
+}
+
+const OUString& MediaDescriptor::PROP_NOAUTOSAVE()
+{
+    static const OUString sProp("NoAutoSave");
+    return sProp;
+}
+
+const OUString& MediaDescriptor::PROP_OPENNEWVIEW()
+{
+    static const OUString sProp("OpenNewView");
+    return sProp;
+}
+
+const OUString& MediaDescriptor::PROP_OUTPUTSTREAM()
+{
+    static const OUString sProp("OutputStream");
+    return sProp;
+}
+
+const OUString& MediaDescriptor::PROP_POSTDATA()
+{
+    static const OUString sProp("PostData");
+    return sProp;
+}
+
+const OUString& MediaDescriptor::PROP_PREVIEW()
+{
+    static const OUString sProp("Preview");
+    return sProp;
+}
+
+const OUString& MediaDescriptor::PROP_READONLY()
+{
+    static const OUString sProp("ReadOnly");
+    return sProp;
+}
+
+const OUString& MediaDescriptor::PROP_REFERRER()
+{
+    static const OUString sProp("Referer");
+    return sProp;
+}
+
+const OUString& MediaDescriptor::PROP_REPLACEABLE()
+{
+    static const OUString sProp("Replaceable");
+    return sProp;
+}
+
+const OUString& MediaDescriptor::PROP_STATUSINDICATOR()
+{
+    static const OUString sProp("StatusIndicator");
+    return sProp;
+}
+
+const OUString& MediaDescriptor::PROP_STREAM()
+{
+    static const OUString sProp("Stream");
+    return sProp;
+}
+
+const OUString& MediaDescriptor::PROP_STREAMFOROUTPUT()
+{
+    static const OUString sProp("StreamForOutput");
+    return sProp;
+}
+
+const OUString& MediaDescriptor::PROP_TEMPLATENAME()
+{
+    static const OUString sProp("TemplateName");
+    return sProp;
+}
+
+const OUString& MediaDescriptor::PROP_TYPENAME()
+{
+    static const OUString sProp("TypeName");
+    return sProp;
+}
+
+const OUString& MediaDescriptor::PROP_UCBCONTENT()
+{
+    static const OUString sProp("UCBContent");
+    return sProp;
+}
+
+const OUString& MediaDescriptor::PROP_UPDATEDOCMODE()
+{
+    static const OUString sProp("UpdateDocMode");
+    return sProp;
+}
+
+const OUString& MediaDescriptor::PROP_URL()
+{
+    static const OUString sProp("URL");
+    return sProp;
+}
+
+const OUString& MediaDescriptor::PROP_VERSION()
+{
+    static const OUString sProp("Version");
+    return sProp;
+}
+
+const OUString& MediaDescriptor::PROP_DOCUMENTTITLE()
+{
+    static const OUString sProp("DocumentTitle");
+    return sProp;
+}
+
+const OUString& MediaDescriptor::PROP_MODEL()
+{
+    static const OUString sProp("Model");
+    return sProp;
+}
+
+const OUString& MediaDescriptor::PROP_PASSWORD()
+{
+    static const OUString sProp("Password");
+    return sProp;
+}
+
+const OUString& MediaDescriptor::PROP_TITLE()
+{
+    static const OUString sProp("Title");
+    return sProp;
+}
+
+const OUString& MediaDescriptor::PROP_SALVAGEDFILE()
+{
+    static const OUString sProp("SalvagedFile");
+    return sProp;
+}
+
+const OUString& MediaDescriptor::PROP_VIEWONLY()
+{
+    static const OUString sProp("ViewOnly");
+    return sProp;
+}
+
+const OUString& MediaDescriptor::PROP_DOCUMENTBASEURL()
+{
+    static const OUString sProp("DocumentBaseURL");
+    return sProp;
+}
+
+const OUString& MediaDescriptor::PROP_SUGGESTEDSAVEASNAME()
+{
+    static const OUString sProp("SuggestedSaveAsName");
+    return sProp;
+}
+
+MediaDescriptor::MediaDescriptor()
+    : SequenceAsHashMap()
+{
+}
+
+MediaDescriptor::MediaDescriptor(const css::uno::Sequence< css::beans::PropertyValue >& lSource)
+    : SequenceAsHashMap(lSource)
+{
+}
+
+bool MediaDescriptor::isStreamReadOnly() const
+{
+    bool bReadOnly = false;
+
+    // check for explicit readonly state
+    const_iterator pIt = find(MediaDescriptor::PROP_READONLY());
+    if (pIt != end())
+    {
+        pIt->second >>= bReadOnly;
+        return bReadOnly;
+    }
+
+    // streams based on post data are readonly by definition
+    pIt = find(MediaDescriptor::PROP_POSTDATA());
+    if (pIt != end())
+        return true;
+
+    // A XStream capsulate XInputStream and XOutputStream ...
+    // If it exists - the file must be open in read/write mode!
+    pIt = find(MediaDescriptor::PROP_STREAM());
+    if (pIt != end())
+        return false;
+
+    // Only file system content provider is able to provide XStream
+    // so for this content impossibility to create XStream triggers
+    // switch to readonly mode.
+    try
+    {
+        css::uno::Reference< css::ucb::XContent > xContent = getUnpackedValueOrDefault(MediaDescriptor::PROP_UCBCONTENT(), css::uno::Reference< css::ucb::XContent >());
+        if (xContent.is())
+        {
+            css::uno::Reference< css::ucb::XContentIdentifier > xId = xContent->getIdentifier();
+            OUString aScheme;
+            if (xId.is())
+                aScheme = xId->getContentProviderScheme();
+
+            if (aScheme.equalsIgnoreAsciiCase("file"))
+                bReadOnly = true;
+            else
+            {
+                ::ucbhelper::Content aContent(xContent,
+                                              utl::UCBContentHelper::getDefaultCommandEnvironment(),
+                                              comphelper::getProcessComponentContext());
+                aContent.getPropertyValue("IsReadOnly") >>= bReadOnly;
+            }
+        }
+    }
+    catch(const css::uno::RuntimeException& )
+        { throw; }
+    catch(const css::uno::Exception&)
+        {}
+
+    return bReadOnly;
+}
+
+css::uno::Any MediaDescriptor::getComponentDataEntry( const OUString& rName ) const
+{
+    comphelper::SequenceAsHashMap::const_iterator aPropertyIter = find( PROP_COMPONENTDATA() );
+    if( aPropertyIter != end() )
+        return comphelper::NamedValueCollection( aPropertyIter->second ).get( rName );
+    return css::uno::Any();
+}
+
+void MediaDescriptor::setComponentDataEntry( const OUString& rName, const css::uno::Any& rValue )
+{
+    if( rValue.hasValue() )
+    {
+        // get or create the 'ComponentData' property entry
+        css::uno::Any& rCompDataAny = operator[]( PROP_COMPONENTDATA() );
+        // insert the value (retain sequence type, create NamedValue elements by default)
+        bool bHasNamedValues = !rCompDataAny.hasValue() || rCompDataAny.has< css::uno::Sequence< css::beans::NamedValue > >();
+        bool bHasPropValues = rCompDataAny.has< css::uno::Sequence< css::beans::PropertyValue > >();
+        OSL_ENSURE( bHasNamedValues || bHasPropValues, "MediaDescriptor::setComponentDataEntry - incompatible 'ComponentData' property in media descriptor" );
+        if( bHasNamedValues || bHasPropValues )
+        {
+            // insert or overwrite the passed value
+            comphelper::SequenceAsHashMap aCompDataMap( rCompDataAny );
+            aCompDataMap[ rName ] = rValue;
+            // write back the sequence (restore sequence with correct element type)
+            rCompDataAny = aCompDataMap.getAsConstAny( bHasPropValues );
+        }
+    }
+    else
+    {
+        // if an empty Any is passed, clear the entry
+        clearComponentDataEntry( rName );
+    }
+}
+
+void MediaDescriptor::clearComponentDataEntry( const OUString& rName )
+{
+    comphelper::SequenceAsHashMap::iterator aPropertyIter = find( PROP_COMPONENTDATA() );
+    if( aPropertyIter != end() )
+    {
+        css::uno::Any& rCompDataAny = aPropertyIter->second;
+        bool bHasNamedValues = rCompDataAny.has< css::uno::Sequence< css::beans::NamedValue > >();
+        bool bHasPropValues = rCompDataAny.has< css::uno::Sequence< css::beans::PropertyValue > >();
+        OSL_ENSURE( bHasNamedValues || bHasPropValues, "MediaDescriptor::clearComponentDataEntry - incompatible 'ComponentData' property in media descriptor" );
+        if( bHasNamedValues || bHasPropValues )
+        {
+            // remove the value with the passed name
+            comphelper::SequenceAsHashMap aCompDataMap( rCompDataAny );
+            aCompDataMap.erase( rName );
+            // write back the sequence, or remove it completely if it is empty
+            if( aCompDataMap.empty() )
+                erase( aPropertyIter );
+            else
+                rCompDataAny = aCompDataMap.getAsConstAny( bHasPropValues );
+        }
+    }
+}
+
+css::uno::Sequence< css::beans::NamedValue > MediaDescriptor::requestAndVerifyDocPassword(
+        comphelper::IDocPasswordVerifier& rVerifier,
+        comphelper::DocPasswordRequestType eRequestType,
+        const ::std::vector< OUString >* pDefaultPasswords )
+{
+    css::uno::Sequence< css::beans::NamedValue > aMediaEncData = getUnpackedValueOrDefault(
+        PROP_ENCRYPTIONDATA(), css::uno::Sequence< css::beans::NamedValue >() );
+    OUString aMediaPassword = getUnpackedValueOrDefault(
+        PROP_PASSWORD(), OUString() );
+    css::uno::Reference< css::task::XInteractionHandler > xInteractHandler = getUnpackedValueOrDefault(
+        PROP_INTERACTIONHANDLER(), css::uno::Reference< css::task::XInteractionHandler >() );
+    OUString aDocumentName = getUnpackedValueOrDefault(
+        PROP_URL(), OUString() );
+
+    bool bIsDefaultPassword = false;
+    css::uno::Sequence< css::beans::NamedValue > aEncryptionData = comphelper::DocPasswordHelper::requestAndVerifyDocPassword(
+        rVerifier, aMediaEncData, aMediaPassword, xInteractHandler, aDocumentName, eRequestType, pDefaultPasswords, &bIsDefaultPassword );
+
+    erase( PROP_PASSWORD() );
+    erase( PROP_ENCRYPTIONDATA() );
+
+    // insert encryption info into media descriptor
+    // TODO
+    if( aEncryptionData.hasElements() )
+        (*this)[ PROP_ENCRYPTIONDATA() ] <<= aEncryptionData;
+
+    return aEncryptionData;
+}
+
+bool MediaDescriptor::addInputStream()
+{
+    return impl_addInputStream( true );
+}
+
+/*-----------------------------------------------*/
+bool MediaDescriptor::addInputStreamOwnLock()
+{
+    const bool bLock = !utl::ConfigManager::IsFuzzing()
+        && officecfg::Office::Common::Misc::UseDocumentSystemFileLocking::get();
+    return impl_addInputStream(bLock);
+}
+
+/*-----------------------------------------------*/
+bool MediaDescriptor::impl_addInputStream( bool bLockFile )
+{
+    // check for an already existing stream item first
+    const_iterator pIt = find(MediaDescriptor::PROP_INPUTSTREAM());
+    if (pIt != end())
+        return true;
+
+    try
+    {
+        // No stream available - create a new one
+        // a) data comes as PostData ...
+        pIt = find(MediaDescriptor::PROP_POSTDATA());
+        if (pIt != end())
+        {
+            const css::uno::Any& rPostData = pIt->second;
+            css::uno::Reference< css::io::XInputStream > xPostData;
+            rPostData >>= xPostData;
+
+            return impl_openStreamWithPostData( xPostData );
+        }
+
+        // b) ... or we must get it from the given URL
+        OUString sURL = getUnpackedValueOrDefault(MediaDescriptor::PROP_URL(), OUString());
+        if (sURL.isEmpty())
+            throw css::uno::Exception("Found no URL.",
+                    css::uno::Reference< css::uno::XInterface >());
+
+        return impl_openStreamWithURL( removeFragment(sURL), bLockFile );
+    }
+    catch(const css::uno::Exception&)
+    {
+        DBG_UNHANDLED_EXCEPTION("unotools.misc", "invalid MediaDescriptor detected");
+        return false;
+    }
+}
+
+bool MediaDescriptor::impl_openStreamWithPostData( const css::uno::Reference< css::io::XInputStream >& _rxPostData )
+{
+    if ( !_rxPostData.is() )
+        throw css::lang::IllegalArgumentException("Found invalid PostData.",
+                css::uno::Reference< css::uno::XInterface >(), 1);
+
+    // PostData can't be used in read/write mode!
+    (*this)[MediaDescriptor::PROP_READONLY()] <<= true;
+
+    // prepare the environment
+    css::uno::Reference< css::task::XInteractionHandler > xInteraction = getUnpackedValueOrDefault(
+        MediaDescriptor::PROP_INTERACTIONHANDLER(),
+        css::uno::Reference< css::task::XInteractionHandler >());
+    css::uno::Reference< css::ucb::XProgressHandler > xProgress;
+    ::ucbhelper::CommandEnvironment* pCommandEnv = new ::ucbhelper::CommandEnvironment(xInteraction, xProgress);
+    css::uno::Reference< css::ucb::XCommandEnvironment > xCommandEnv(static_cast< css::ucb::XCommandEnvironment* >(pCommandEnv), css::uno::UNO_QUERY);
+
+    // media type
+    OUString sMediaType = getUnpackedValueOrDefault(MediaDescriptor::PROP_MEDIATYPE(), OUString());
+    if (sMediaType.isEmpty())
+    {
+        sMediaType = "application/x-www-form-urlencoded";
+        (*this)[MediaDescriptor::PROP_MEDIATYPE()] <<= sMediaType;
+    }
+
+    // url
+    OUString sURL( getUnpackedValueOrDefault( PROP_URL(), OUString() ) );
+
+    css::uno::Reference< css::io::XInputStream > xResultStream;
+    try
+    {
+        // seek PostData stream to the beginning
+        css::uno::Reference< css::io::XSeekable > xSeek( _rxPostData, css::uno::UNO_QUERY );
+        if ( xSeek.is() )
+            xSeek->seek( 0 );
+
+        // a content for the URL
+        ::ucbhelper::Content aContent( sURL, xCommandEnv, comphelper::getProcessComponentContext() );
+
+        // use post command
+        css::ucb::PostCommandArgument2 aPostArgument;
+        aPostArgument.Source = _rxPostData;
+        css::uno::Reference< css::io::XActiveDataSink > xSink( new ucbhelper::ActiveDataSink );
+        aPostArgument.Sink = xSink;
+        aPostArgument.MediaType = sMediaType;
+        aPostArgument.Referer = getUnpackedValueOrDefault( PROP_REFERRER(), OUString() );
+
+        aContent.executeCommand( "post", css::uno::makeAny( aPostArgument ) );
+
+        // get result
+        xResultStream = xSink->getInputStream();
+    }
+    catch( const css::uno::Exception& )
+    {
+    }
+
+    // success?
+    if ( !xResultStream.is() )
+    {
+        OSL_FAIL( "no valid reply to the HTTP-Post" );
+        return false;
+    }
+
+    (*this)[MediaDescriptor::PROP_INPUTSTREAM()] <<= xResultStream;
+    return true;
+}
+
+/*-----------------------------------------------*/
+bool MediaDescriptor::impl_openStreamWithURL( const OUString& sURL, bool bLockFile )
+{
+    OUString referer(getUnpackedValueOrDefault(PROP_REFERRER(), OUString()));
+    if (SvtSecurityOptions().isUntrustedReferer(referer)) {
+        return false;
+    }
+
+    // prepare the environment
+    css::uno::Reference< css::task::XInteractionHandler > xOrgInteraction = getUnpackedValueOrDefault(
+        MediaDescriptor::PROP_INTERACTIONHANDLER(),
+        css::uno::Reference< css::task::XInteractionHandler >());
+
+    css::uno::Reference< css::task::XInteractionHandler > xAuthenticationInteraction = getUnpackedValueOrDefault(
+        MediaDescriptor::PROP_AUTHENTICATIONHANDLER(),
+        css::uno::Reference< css::task::XInteractionHandler >());
+
+    comphelper::StillReadWriteInteraction* pInteraction = new comphelper::StillReadWriteInteraction(xOrgInteraction,xAuthenticationInteraction);
+    css::uno::Reference< css::task::XInteractionHandler > xInteraction(static_cast< css::task::XInteractionHandler* >(pInteraction), css::uno::UNO_QUERY);
+
+    css::uno::Reference< css::ucb::XProgressHandler > xProgress;
+    ::ucbhelper::CommandEnvironment* pCommandEnv = new ::ucbhelper::CommandEnvironment(xInteraction, xProgress);
+    css::uno::Reference< css::ucb::XCommandEnvironment > xCommandEnv(static_cast< css::ucb::XCommandEnvironment* >(pCommandEnv), css::uno::UNO_QUERY);
+
+    // try to create the content
+    // no content -> no stream => return immediately with FALSE
+    ::ucbhelper::Content                      aContent;
+    css::uno::Reference< css::ucb::XContent > xContent;
+    try
+    {
+        aContent = ::ucbhelper::Content(sURL, xCommandEnv, comphelper::getProcessComponentContext());
+        xContent = aContent.get();
+    }
+    catch(const css::uno::RuntimeException&)
+        { throw; }
+    catch(const css::ucb::ContentCreationException&)
+        {
+            TOOLS_WARN_EXCEPTION("unotools.misc", "url: '" << sURL << "'");
+            return false; // TODO error handling
+        }
+    catch(const css::uno::Exception&)
+        {
+            TOOLS_WARN_EXCEPTION("unotools.misc", "url: '" << sURL << "'");
+            return false; // TODO error handling
+        }
+
+    // try to open the file in read/write mode
+    // (if it's allowed to do so).
+    // But handle errors in a "hidden mode". Because
+    // we try it readonly later - if read/write is not an option.
+    css::uno::Reference< css::io::XStream >      xStream;
+    css::uno::Reference< css::io::XInputStream > xInputStream;
+
+    bool bReadOnly = false;
+    bool bModeRequestedExplicitly = false;
+    const_iterator pIt = find(MediaDescriptor::PROP_READONLY());
+    if (pIt != end())
+    {
+        pIt->second >>= bReadOnly;
+        bModeRequestedExplicitly = true;
+    }
+
+    if ( !bReadOnly && bLockFile )
+    {
+        try
+        {
+            // TODO: use "special" still interaction to suppress error messages
+            xStream = aContent.openWriteableStream();
+            if (xStream.is())
+                xInputStream = xStream->getInputStream();
+        }
+        catch(const css::uno::RuntimeException&)
+            { throw; }
+        catch(const css::uno::Exception&)
+            {
+                css::uno::Any ex( cppu::getCaughtException() );
+                // ignore exception, if reason was problem reasoned on
+                // open it in WRITABLE mode! Then we try it READONLY
+                // later a second time.
+                // All other errors must be handled as real error an
+                // break this method.
+                if (!pInteraction->wasWriteError() || bModeRequestedExplicitly)
+                {
+                    SAL_WARN("unotools.misc","url: '" << sURL << "' " << exceptionToString(ex));
+                    // If the protocol is webdav, then we need to treat the stream as readonly, even if the
+                    // operation was requested as read/write explicitly (the WebDAV UCB implementation is monodirectional
+                    // read or write not both at the same time).
+                    if ( !INetURLObject( sURL ).isAnyKnownWebDAVScheme() )
+                        return false;
+                }
+                xStream.clear();
+                xInputStream.clear();
+            }
+    }
+
+    // If opening of the stream in read/write mode was not allowed
+    // or failed by an error - we must try it in readonly mode.
+    if (!xInputStream.is())
+    {
+        OUString aScheme;
+
+        try
+        {
+            css::uno::Reference< css::ucb::XContentIdentifier > xContId(
+                aContent.get().is() ? aContent.get()->getIdentifier() : nullptr );
+
+            if ( xContId.is() )
+                aScheme = xContId->getContentProviderScheme();
+
+            // Only file system content provider is able to provide XStream
+            // so for this content impossibility to create XStream triggers
+            // switch to readonly mode in case of opening with locking on
+            if( bLockFile && aScheme.equalsIgnoreAsciiCase("file") )
+                bReadOnly = true;
+            else
+            {
+                bool bRequestReadOnly = bReadOnly;
+                aContent.getPropertyValue("IsReadOnly") >>= bReadOnly;
+                if ( bReadOnly && !bRequestReadOnly && bModeRequestedExplicitly )
+                        return false; // the document is explicitly requested with WRITABLE mode
+            }
+        }
+        catch(const css::uno::RuntimeException&)
+            { throw; }
+        catch(const css::uno::Exception&)
+            { /* no error handling if IsReadOnly property does not exist for UCP */ }
+
+        if ( bReadOnly )
+               (*this)[MediaDescriptor::PROP_READONLY()] <<= bReadOnly;
+
+        pInteraction->resetInterceptions();
+        pInteraction->resetErrorStates();
+        try
+        {
+            // all the contents except file-URLs should be opened as usual
+            if ( bLockFile || !aScheme.equalsIgnoreAsciiCase("file") )
+                xInputStream = aContent.openStream();
+            else
+                xInputStream = aContent.openStreamNoLock();
+        }
+        catch(const css::uno::RuntimeException&)
+        {
+            throw;
+        }
+        catch(const css::uno::Exception&)
+        {
+            TOOLS_INFO_EXCEPTION("unotools.misc","url: '" << sURL << "'");
+            return false;
+        }
+    }
+
+    // add streams to the descriptor
+    if (xContent.is())
+        (*this)[MediaDescriptor::PROP_UCBCONTENT()] <<= xContent;
+    if (xStream.is())
+        (*this)[MediaDescriptor::PROP_STREAM()] <<= xStream;
+    if (xInputStream.is())
+        (*this)[MediaDescriptor::PROP_INPUTSTREAM()] <<= xInputStream;
+
+    // At least we need an input stream. The r/w stream is optional ...
+    return xInputStream.is();
+}
+
+} // namespace comphelper
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */