Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

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

29 files changed, 9708 insertions, 0 deletions

diff --git a/desktop/source/deployment/registry/component/dp_compbackenddb.cxx b/desktop/source/deployment/registry/component/dp_compbackenddb.cxx
new file mode 100644
index 000000000..fd9bb2c61
--- /dev/null
+++ b/desktop/source/deployment/registry/component/dp_compbackenddb.cxx
@@ -0,0 +1,131 @@
+/* -*- 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 <cppuhelper/exc_hlp.hxx>
+#include <com/sun/star/deployment/DeploymentException.hpp>
+#include <com/sun/star/uno/XComponentContext.hpp>
+
+#include "dp_compbackenddb.hxx"
+
+
+using namespace ::com::sun::star::uno;
+
+constexpr OUStringLiteral EXTENSION_REG_NS = u"http://openoffice.org/extensionmanager/component-registry/2010";
+constexpr OUStringLiteral NS_PREFIX = u"comp";
+constexpr OUStringLiteral ROOT_ELEMENT_NAME = u"component-backend-db";
+constexpr OUStringLiteral KEY_ELEMENT_NAME = u"component";
+
+namespace dp_registry::backend::component {
+
+ComponentBackendDb::ComponentBackendDb(
+    Reference<XComponentContext> const &  xContext,
+    OUString const & url):BackendDb(xContext, url)
+{
+
+}
+
+OUString ComponentBackendDb::getDbNSName()
+{
+    return EXTENSION_REG_NS;
+}
+
+OUString ComponentBackendDb::getNSPrefix()
+{
+    return NS_PREFIX;
+}
+
+OUString ComponentBackendDb::getRootElementName()
+{
+    return ROOT_ELEMENT_NAME;
+}
+
+OUString ComponentBackendDb::getKeyElementName()
+{
+    return KEY_ELEMENT_NAME;
+}
+
+void ComponentBackendDb::addEntry(OUString const & url, Data const & data)
+{
+    try{
+        if (!activateEntry(url))
+        {
+            Reference<css::xml::dom::XNode> componentNode = writeKeyElement(url);
+            writeSimpleElement(u"java-type-library",
+                               OUString::boolean(data.javaTypeLibrary),
+                               componentNode);
+
+            writeSimpleList(
+                data.implementationNames,
+                u"implementation-names",
+                u"name",
+                componentNode);
+
+            writeVectorOfPair(
+                data.singletons,
+                u"singletons",
+                u"item",
+                u"key",
+                u"value",
+                componentNode);
+
+            save();
+        }
+    }
+    catch(const css::uno::Exception &)
+    {
+        Any exc( ::cppu::getCaughtException() );
+        throw css::deployment::DeploymentException(
+            "Extension Manager: failed to write data entry in backend db: " +
+            m_urlDb, nullptr, exc);
+    }
+}
+
+ComponentBackendDb::Data ComponentBackendDb::getEntry(std::u16string_view url)
+{
+    try
+    {
+        ComponentBackendDb::Data retData;
+        Reference<css::xml::dom::XNode> aNode = getKeyElement(url);
+        if (aNode.is())
+        {
+            bool bJava = readSimpleElement(u"java-type-library", aNode) == "true";
+            retData.javaTypeLibrary = bJava;
+
+            retData.implementationNames =
+                readList( aNode, u"implementation-names", u"name");
+
+            retData.singletons =
+                readVectorOfPair( aNode, u"singletons", u"item", u"key", u"value");
+        }
+        return retData;
+    }
+    catch(const css::uno::Exception &)
+    {
+        Any exc( ::cppu::getCaughtException() );
+        throw css::deployment::DeploymentException(
+            "Extension Manager: failed to read data entry in backend db: " +
+            m_urlDb, nullptr, exc);
+    }
+}
+
+
+} // namespace dp_registry::backend::component
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/desktop/source/deployment/registry/component/dp_compbackenddb.hxx b/desktop/source/deployment/registry/component/dp_compbackenddb.hxx
new file mode 100644
index 000000000..84153b6fa
--- /dev/null
+++ b/desktop/source/deployment/registry/component/dp_compbackenddb.hxx
@@ -0,0 +1,95 @@
+/* -*- 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 .
+ */
+
+#pragma once
+
+#include <rtl/ustring.hxx>
+#include <rtl/string.hxx>
+#include <vector>
+#include <deque>
+#include <string_view>
+
+#include <dp_backenddb.hxx>
+
+namespace com::sun::star::uno { class XComponentContext; }
+
+namespace dp_registry::backend::component {
+
+/* The XML file stores the extensions which are currently registered.
+   They will be removed when they are revoked.
+   The format looks like this:
+
+<?xml version="1.0"?>
+<component-backend-db xmlns="http://openoffice.org/extensionmanager/component-registry/2010">
+  <component url="vnd.sun.star.expand:$UNO_USER_PACKAGES_CACHE/uno_packages/5CD5.tmp_/leaves1.oxt/extensionoptions.jar">
+    <name>FileName</name>
+    <java-type-library>true</java-type-library>
+    <implementation-names>
+      <name>com.sun.star.comp.extensionoptions.OptionsEventHandler$_OptionsEventHandler</name>
+      ...
+    </implementation-names>
+    <singletons>
+      <item>
+        <key>com.sun.star.java.theJavaVirtualMachine</key>
+        <value>com.sun.star.java.JavaVirtualMachine</value>
+      </item>
+      ...
+    </singletons>
+  </component>
+
+  <component ...>
+  ...
+</component-backend-db>
+ */
+class ComponentBackendDb: public dp_registry::backend::BackendDb
+{
+protected:
+    virtual OUString getDbNSName() override;
+    virtual OUString getNSPrefix() override;
+    virtual OUString getRootElementName() override;
+    virtual OUString getKeyElementName() override;
+
+public:
+    struct Data
+    {
+        Data(): javaTypeLibrary(false) {};
+
+        std::deque< OUString> implementationNames;
+        std::vector< std::pair< OUString, OUString> >singletons;
+            // map from singleton names to implementation names
+        bool javaTypeLibrary;
+    };
+
+public:
+
+    ComponentBackendDb( css::uno::Reference<css::uno::XComponentContext> const &  xContext,
+                        OUString const & url);
+
+    void addEntry(OUString const & url, Data const & data);
+
+    Data getEntry(std::u16string_view url);
+
+
+};
+
+
+}
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/desktop/source/deployment/registry/component/dp_component.cxx b/desktop/source/deployment/registry/component/dp_component.cxx
new file mode 100644
index 000000000..b9aa6518a
--- /dev/null
+++ b/desktop/source/deployment/registry/component/dp_component.cxx
@@ -0,0 +1,1720 @@
+/* -*- 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 <strings.hrc>
+#include <dp_misc.h>
+#include <dp_shared.hxx>
+#include <dp_backend.h>
+#include <dp_platform.hxx>
+#include <dp_ucb.h>
+#include <rtl/string.hxx>
+#include <rtl/strbuf.hxx>
+#include <rtl/ustrbuf.hxx>
+#include <rtl/uri.hxx>
+#include <sal/log.hxx>
+#include <cppuhelper/exc_hlp.hxx>
+#include <cppuhelper/supportsservice.hxx>
+#include <ucbhelper/content.hxx>
+#include <comphelper/sequence.hxx>
+#include <utility>
+#include <xmlscript/xml_helper.hxx>
+#include <svl/inettype.hxx>
+#include <tools/diagnose_ex.h>
+#include <o3tl/string_view.hxx>
+#include <com/sun/star/beans/NamedValue.hpp>
+#include <com/sun/star/deployment/DeploymentException.hpp>
+#include <com/sun/star/lang/WrappedTargetRuntimeException.hpp>
+#include <com/sun/star/container/XNameContainer.hpp>
+#include <com/sun/star/container/XSet.hpp>
+#include <com/sun/star/registry/XSimpleRegistry.hpp>
+#include <com/sun/star/registry/XImplementationRegistration.hpp>
+#include <com/sun/star/loader/XImplementationLoader.hpp>
+#include <com/sun/star/io/XInputStream.hpp>
+#include <com/sun/star/ucb/NameClash.hpp>
+#include <com/sun/star/util/theMacroExpander.hpp>
+#include <algorithm>
+#include <deque>
+#include <memory>
+#include <string_view>
+#include <unordered_map>
+#include <vector>
+#include "dp_compbackenddb.hxx"
+
+using namespace ::dp_misc;
+using namespace ::com::sun::star;
+using namespace ::com::sun::star::uno;
+using namespace ::com::sun::star::ucb;
+
+namespace dp_registry::backend::component {
+namespace {
+
+/** return a vector of bootstrap variables which have been provided
+    as command arguments.
+*/
+std::vector<OUString> getCmdBootstrapVariables()
+{
+    std::vector<OUString> ret;
+    sal_uInt32 count = osl_getCommandArgCount();
+    for (sal_uInt32 i = 0; i < count; i++)
+    {
+        OUString arg;
+        osl_getCommandArg(i, &arg.pData);
+        if (arg.startsWith("-env:"))
+            ret.push_back(arg);
+    }
+    return ret;
+}
+
+bool jarManifestHeaderPresent(
+    OUString const & url, OUString const & name,
+    Reference<XCommandEnvironment> const & xCmdEnv )
+{
+    OUString buf = "vnd.sun.star.zip://"
+        + ::rtl::Uri::encode(
+            url, rtl_UriCharClassRegName, rtl_UriEncodeIgnoreEscapes,
+            RTL_TEXTENCODING_UTF8 )
+        + "/META-INF/MANIFEST.MF";
+    ::ucbhelper::Content manifestContent;
+    OUString line;
+    return
+        create_ucb_content(
+            &manifestContent, buf, xCmdEnv,
+            false /* no throw */ )
+        && readLine( &line, name, manifestContent, RTL_TEXTENCODING_ASCII_US );
+}
+
+
+class BackendImpl : public ::dp_registry::backend::PackageRegistryBackend
+{
+    class ComponentPackageImpl : public ::dp_registry::backend::Package
+    {
+        BackendImpl * getMyBackend() const;
+
+        const OUString m_loader;
+
+        enum class Reg { Uninit, Void, Registered, NotRegistered, MaybeRegistered };
+        Reg m_registered;
+
+        void getComponentInfo(
+            ComponentBackendDb::Data * data,
+            std::vector< css::uno::Reference< css::uno::XInterface > > *
+                factories,
+            Reference<XComponentContext> const & xContext );
+
+        void componentLiveInsertion(
+            ComponentBackendDb::Data const & data,
+            std::vector< css::uno::Reference< css::uno::XInterface > > const &
+                factories);
+
+        void componentLiveRemoval(ComponentBackendDb::Data const & data);
+
+        // Package
+        virtual beans::Optional< beans::Ambiguous<sal_Bool> > isRegistered_(
+            ::osl::ResettableMutexGuard & guard,
+            ::rtl::Reference<AbortChannel> const & abortChannel,
+            Reference<XCommandEnvironment> const & xCmdEnv ) override;
+        virtual void processPackage_(
+            ::osl::ResettableMutexGuard & guard,
+            bool registerPackage,
+            bool startup,
+            ::rtl::Reference<AbortChannel> const & abortChannel,
+            Reference<XCommandEnvironment> const & xCmdEnv ) override;
+
+        Reference<registry::XSimpleRegistry> getRDB() const;
+
+    public:
+        ComponentPackageImpl(
+            ::rtl::Reference<PackageRegistryBackend> const & myBackend,
+            OUString const & url, OUString const & name,
+            Reference<deployment::XPackageTypeInfo> const & xPackageType,
+            OUString loader, bool bRemoved,
+            OUString const & identifier);
+    };
+    friend class ComponentPackageImpl;
+
+    class ComponentsPackageImpl : public ::dp_registry::backend::Package
+    {
+        BackendImpl * getMyBackend() const;
+
+        // Package
+        virtual beans::Optional< beans::Ambiguous<sal_Bool> > isRegistered_(
+            ::osl::ResettableMutexGuard & guard,
+            ::rtl::Reference<AbortChannel> const & abortChannel,
+            Reference<XCommandEnvironment> const & xCmdEnv ) override;
+        virtual void processPackage_(
+            ::osl::ResettableMutexGuard & guard,
+            bool registerPackage,
+            bool startup,
+            ::rtl::Reference<AbortChannel> const & abortChannel,
+            Reference<XCommandEnvironment> const & xCmdEnv ) override;
+    public:
+        ComponentsPackageImpl(
+            ::rtl::Reference<PackageRegistryBackend> const & myBackend,
+            OUString const & url, OUString const & name,
+            Reference<deployment::XPackageTypeInfo> const & xPackageType,
+            bool bRemoved, OUString const & identifier);
+    };
+    friend class ComponentsPackageImpl;
+
+    class TypelibraryPackageImpl : public ::dp_registry::backend::Package
+    {
+        BackendImpl * getMyBackend() const;
+
+        const bool m_jarFile;
+
+        // Package
+        virtual beans::Optional< beans::Ambiguous<sal_Bool> > isRegistered_(
+            ::osl::ResettableMutexGuard & guard,
+            ::rtl::Reference<AbortChannel> const & abortChannel,
+            Reference<XCommandEnvironment> const & xCmdEnv ) override;
+        virtual void processPackage_(
+            ::osl::ResettableMutexGuard & guard,
+            bool registerPackage,
+            bool startup,
+            ::rtl::Reference<AbortChannel> const & abortChannel,
+            Reference<XCommandEnvironment> const & xCmdEnv ) override;
+
+    public:
+        TypelibraryPackageImpl(
+            ::rtl::Reference<PackageRegistryBackend> const & myBackend,
+            OUString const & url, OUString const & name,
+            Reference<deployment::XPackageTypeInfo> const & xPackageType,
+            bool jarFile, bool bRemoved,
+            OUString const & identifier);
+    };
+    friend class TypelibraryPackageImpl;
+
+    /** Serves for unregistering packages that were registered on a
+        different platform. This can happen if one has remotely mounted
+        /home, for example.
+     */
+    class OtherPlatformPackageImpl : public ::dp_registry::backend::Package
+    {
+    public:
+        OtherPlatformPackageImpl(
+            ::rtl::Reference<PackageRegistryBackend> const & myBackend,
+            OUString const & url, OUString const & name,
+            Reference<deployment::XPackageTypeInfo> const & xPackageType,
+            bool bRemoved, OUString const & identifier, OUString platform);
+
+    private:
+        BackendImpl * getMyBackend() const;
+
+        Reference<registry::XSimpleRegistry> impl_openRDB() const;
+        Reference<XInterface> impl_createInstance(OUString const& rService) const;
+
+        // Package
+        virtual beans::Optional< beans::Ambiguous<sal_Bool> > isRegistered_(
+            ::osl::ResettableMutexGuard & guard,
+            ::rtl::Reference<AbortChannel> const & abortChannel,
+            Reference<XCommandEnvironment> const & xCmdEnv ) override;
+        virtual void processPackage_(
+            ::osl::ResettableMutexGuard & guard,
+            bool registerPackage,
+            bool startup,
+            ::rtl::Reference<AbortChannel> const & abortChannel,
+            Reference<XCommandEnvironment> const & xCmdEnv ) override;
+
+    private:
+        OUString const m_aPlatform;
+    };
+    friend class OtherPlatformPackageImpl;
+
+    std::deque<OUString> m_jar_typelibs;
+    std::deque<OUString> m_rdb_typelibs;
+    std::deque<OUString> m_components;
+
+    enum RcItem { RCITEM_JAR_TYPELIB, RCITEM_RDB_TYPELIB, RCITEM_COMPONENTS };
+
+    std::deque<OUString> & getRcItemList( RcItem kind ) {
+        switch (kind)
+        {
+        case RCITEM_JAR_TYPELIB:
+            return m_jar_typelibs;
+        case RCITEM_RDB_TYPELIB:
+            return m_rdb_typelibs;
+        default: // case RCITEM_COMPONENTS
+            return m_components;
+        }
+    }
+
+    bool m_unorc_inited;
+    bool m_unorc_modified;
+    bool bSwitchedRdbFiles;
+
+    typedef std::unordered_map< OUString, Reference<XInterface> > t_string2object;
+    t_string2object m_backendObjects;
+
+    // PackageRegistryBackend
+    virtual Reference<deployment::XPackage> bindPackage_(
+        OUString const & url, OUString const & mediaType,
+        bool bRemoved, OUString const & identifier,
+        Reference<XCommandEnvironment> const & xCmdEnv ) override;
+
+    virtual void SAL_CALL disposing() override;
+
+    const Reference<deployment::XPackageTypeInfo> m_xDynComponentTypeInfo;
+    const Reference<deployment::XPackageTypeInfo> m_xJavaComponentTypeInfo;
+    const Reference<deployment::XPackageTypeInfo> m_xPythonComponentTypeInfo;
+    const Reference<deployment::XPackageTypeInfo> m_xComponentsTypeInfo;
+    const Reference<deployment::XPackageTypeInfo> m_xRDBTypelibTypeInfo;
+    const Reference<deployment::XPackageTypeInfo> m_xJavaTypelibTypeInfo;
+    Sequence< Reference<deployment::XPackageTypeInfo> > m_typeInfos;
+
+    OUString m_commonRDB;
+    OUString m_nativeRDB;
+
+    //URLs of the original rdbs (before any switching):
+    OUString m_commonRDB_orig;
+    OUString m_nativeRDB_orig;
+
+    std::unique_ptr<ComponentBackendDb> m_backendDb;
+
+    void addDataToDb(OUString const & url, ComponentBackendDb::Data const & data);
+    ComponentBackendDb::Data readDataFromDb(std::u16string_view url);
+    void revokeEntryFromDb(std::u16string_view url);
+
+    Reference<registry::XSimpleRegistry> m_xCommonRDB;
+    Reference<registry::XSimpleRegistry> m_xNativeRDB;
+
+    void unorc_verify_init( Reference<XCommandEnvironment> const & xCmdEnv );
+    void unorc_flush( Reference<XCommandEnvironment> const & xCmdEnv );
+
+    Reference<XInterface> getObject( OUString const & id );
+    Reference<XInterface> insertObject(
+        OUString const & id, Reference<XInterface> const & xObject );
+    void releaseObject( OUString const & id );
+
+    void addToUnoRc( RcItem kind, OUString const & url,
+                     Reference<XCommandEnvironment> const & xCmdEnv );
+    void removeFromUnoRc( RcItem kind, OUString const & url,
+                          Reference<XCommandEnvironment> const & xCmdEnv );
+    bool hasInUnoRc( RcItem kind, OUString const & url );
+
+    css::uno::Reference< css::uno::XComponentContext > getRootContext() const;
+
+public:
+    BackendImpl( Sequence<Any> const & args,
+                 Reference<XComponentContext> const & xComponentContext );
+
+    // XServiceInfo
+    virtual OUString SAL_CALL getImplementationName() override;
+    virtual sal_Bool SAL_CALL supportsService( const OUString& ServiceName ) override;
+    virtual css::uno::Sequence< OUString > SAL_CALL getSupportedServiceNames() override;
+
+    // XPackageRegistry
+    virtual Sequence< Reference<deployment::XPackageTypeInfo> > SAL_CALL
+    getSupportedPackageTypes() override;
+
+    virtual void SAL_CALL packageRemoved(OUString const & url, OUString const & mediaType) override;
+
+    using PackageRegistryBackend::disposing;
+
+    //Will be called from ComponentPackageImpl
+    void initServiceRdbFiles();
+};
+
+
+BackendImpl::ComponentPackageImpl::ComponentPackageImpl(
+    ::rtl::Reference<PackageRegistryBackend> const & myBackend,
+    OUString const & url, OUString const & name,
+    Reference<deployment::XPackageTypeInfo> const & xPackageType,
+    OUString loader, bool bRemoved,
+    OUString const & identifier)
+    : Package( myBackend, url, name, name /* display-name */,
+               xPackageType, bRemoved, identifier),
+      m_loader(std::move( loader )),
+      m_registered( Reg::Uninit )
+{}
+
+Reference<registry::XSimpleRegistry>
+BackendImpl::ComponentPackageImpl::getRDB() const
+{
+    BackendImpl * that = getMyBackend();
+
+    //Late "initialization" of the services rdb files
+    //This is to prevent problems when running several
+    //instances of OOo with root rights in parallel. This
+    //would otherwise cause problems when copying the rdbs.
+    //See  http://qa.openoffice.org/issues/show_bug.cgi?id=99257
+    {
+        const ::osl::MutexGuard guard( m_aMutex );
+        if (!that->bSwitchedRdbFiles)
+        {
+            that->bSwitchedRdbFiles = true;
+            that->initServiceRdbFiles();
+        }
+    }
+    if ( m_loader == "com.sun.star.loader.SharedLibrary" )
+        return that->m_xNativeRDB;
+    else
+        return that->m_xCommonRDB;
+}
+
+BackendImpl * BackendImpl::ComponentPackageImpl::getMyBackend() const
+{
+    BackendImpl * pBackend = static_cast<BackendImpl *>(m_myBackend.get());
+    if (nullptr == pBackend)
+    {
+        //Throws a DisposedException
+        check();
+        //We should never get here...
+        throw RuntimeException(
+            "Failed to get the BackendImpl",
+            static_cast<OWeakObject*>(const_cast<ComponentPackageImpl *>(this)));
+    }
+    return pBackend;
+}
+
+
+void BackendImpl::disposing()
+{
+    try {
+        m_backendObjects = t_string2object();
+        if (m_xNativeRDB.is()) {
+            m_xNativeRDB->close();
+            m_xNativeRDB.clear();
+        }
+        if (m_xCommonRDB.is()) {
+            m_xCommonRDB->close();
+            m_xCommonRDB.clear();
+        }
+        unorc_flush( Reference<XCommandEnvironment>() );
+
+        PackageRegistryBackend::disposing();
+    }
+    catch (const RuntimeException &) {
+        throw;
+    }
+    catch (const Exception &) {
+        Any exc( ::cppu::getCaughtException() );
+        throw lang::WrappedTargetRuntimeException(
+            "caught unexpected exception while disposing...",
+            static_cast<OWeakObject *>(this), exc );
+    }
+}
+
+
+void BackendImpl::initServiceRdbFiles()
+{
+    const Reference<XCommandEnvironment> xCmdEnv;
+
+    ::ucbhelper::Content cacheDir( getCachePath(), xCmdEnv, m_xComponentContext );
+    ::ucbhelper::Content oldRDB;
+    // switch common rdb:
+    if (!m_commonRDB_orig.isEmpty())
+    {
+        (void)create_ucb_content(
+            &oldRDB, makeURL( getCachePath(), m_commonRDB_orig),
+            xCmdEnv, false /* no throw */ );
+    }
+    m_commonRDB = m_commonRDB_orig == "common.rdb" ? std::u16string_view(u"common_.rdb") : std::u16string_view(u"common.rdb");
+    if (oldRDB.get().is())
+    {
+        cacheDir.transferContent(
+                oldRDB, ::ucbhelper::InsertOperation::Copy,
+                m_commonRDB, NameClash::OVERWRITE );
+        oldRDB = ::ucbhelper::Content();
+    }
+    // switch native rdb:
+    if (!m_nativeRDB_orig.isEmpty())
+    {
+        (void)create_ucb_content(
+            &oldRDB, makeURL(getCachePath(), m_nativeRDB_orig),
+            xCmdEnv, false /* no throw */ );
+    }
+    const OUString plt_rdb( getPlatformString() + ".rdb" );
+    const OUString plt_rdb_( getPlatformString() + "_.rdb" );
+    m_nativeRDB = (m_nativeRDB_orig == plt_rdb ) ? plt_rdb_ : plt_rdb;
+    if (oldRDB.get().is())
+    {
+        cacheDir.transferContent(
+                oldRDB, ::ucbhelper::InsertOperation::Copy,
+                m_nativeRDB, NameClash::OVERWRITE );
+    }
+
+    // UNO is bootstrapped, flush for next process start:
+    m_unorc_modified = true;
+    unorc_flush( Reference<XCommandEnvironment>() );
+
+
+    // common rdb for java, native rdb for shared lib components
+    if (!m_commonRDB.isEmpty()) {
+        m_xCommonRDB.set(
+            m_xComponentContext->getServiceManager()
+            ->createInstanceWithContext(
+            "com.sun.star.registry.SimpleRegistry",
+            m_xComponentContext ), UNO_QUERY_THROW );
+        m_xCommonRDB->open(
+            makeURL( expandUnoRcUrl(getCachePath()), m_commonRDB ),
+            false, true);
+    }
+    if (!m_nativeRDB.isEmpty()) {
+        m_xNativeRDB.set(
+            m_xComponentContext->getServiceManager()
+            ->createInstanceWithContext(
+            "com.sun.star.registry.SimpleRegistry",
+            m_xComponentContext ), UNO_QUERY_THROW );
+        m_xNativeRDB->open(
+            makeURL( expandUnoRcUrl(getCachePath()), m_nativeRDB ),
+            false, true);
+    }
+}
+
+BackendImpl::BackendImpl(
+    Sequence<Any> const & args,
+    Reference<XComponentContext> const & xComponentContext )
+    : PackageRegistryBackend( args, xComponentContext ),
+      m_unorc_inited( false ),
+      m_unorc_modified( false ),
+      bSwitchedRdbFiles(false),
+      m_xDynComponentTypeInfo( new Package::TypeInfo(
+             "application/vnd.sun.star.uno-component;type=native;platform=" +
+                                   getPlatformString(),
+                                   "*" SAL_DLLEXTENSION,
+                                   DpResId(RID_STR_DYN_COMPONENT)
+                                   ) ),
+      m_xJavaComponentTypeInfo( new Package::TypeInfo(
+             "application/vnd.sun.star.uno-component;type=Java",
+                                    "*.jar",
+                                    DpResId(RID_STR_JAVA_COMPONENT)
+                                    ) ),
+      m_xPythonComponentTypeInfo( new Package::TypeInfo(
+             "application/vnd.sun.star.uno-component;type=Python",
+                                      "*.py",
+                                      DpResId(
+                                          RID_STR_PYTHON_COMPONENT)
+                                      ) ),
+      m_xComponentsTypeInfo( new Package::TypeInfo(
+                                 "application/vnd.sun.star.uno-components",
+                                 "*.components",
+                                 DpResId(RID_STR_COMPONENTS)
+                                 ) ),
+      m_xRDBTypelibTypeInfo( new Package::TypeInfo(
+             "application/vnd.sun.star.uno-typelibrary;type=RDB",
+                                 "*.rdb",
+                                 DpResId(RID_STR_RDB_TYPELIB)
+                                 ) ),
+      m_xJavaTypelibTypeInfo( new Package::TypeInfo(
+             "application/vnd.sun.star.uno-typelibrary;type=Java",
+                                  "*.jar",
+                                  DpResId(RID_STR_JAVA_TYPELIB)
+                                  ) ),
+      m_typeInfos{ m_xDynComponentTypeInfo, m_xJavaComponentTypeInfo, m_xPythonComponentTypeInfo,
+                   m_xComponentsTypeInfo, m_xRDBTypelibTypeInfo, m_xJavaTypelibTypeInfo }
+{
+    const Reference<XCommandEnvironment> xCmdEnv;
+
+    if (transientMode())
+    {
+        // in-mem rdbs:
+        // common rdb for java, native rdb for shared lib components
+        m_xCommonRDB.set(
+            xComponentContext->getServiceManager()->createInstanceWithContext(
+                "com.sun.star.registry.SimpleRegistry",
+                xComponentContext ), UNO_QUERY_THROW );
+        m_xCommonRDB->open( OUString() /* in-mem */,
+                            false /* ! read-only */, true /* create */ );
+        m_xNativeRDB.set(
+            xComponentContext->getServiceManager()->createInstanceWithContext(
+                "com.sun.star.registry.SimpleRegistry",
+                xComponentContext ), UNO_QUERY_THROW );
+        m_xNativeRDB->open( OUString() /* in-mem */,
+                            false /* ! read-only */, true /* create */ );
+    }
+    else
+    {
+        unorc_verify_init( xCmdEnv );
+        OUString dbFile = makeURL(getCachePath(), "backenddb.xml");
+        m_backendDb.reset(
+            new ComponentBackendDb(getComponentContext(), dbFile));
+    }
+}
+
+// XServiceInfo
+OUString BackendImpl::getImplementationName()
+{
+    return "com.sun.star.comp.deployment.component.PackageRegistryBackend";
+}
+
+sal_Bool BackendImpl::supportsService( const OUString& ServiceName )
+{
+    return cppu::supportsService(this, ServiceName);
+}
+
+css::uno::Sequence< OUString > BackendImpl::getSupportedServiceNames()
+{
+    return { BACKEND_SERVICE_NAME };
+}
+
+void BackendImpl::addDataToDb(
+    OUString const & url, ComponentBackendDb::Data const & data)
+{
+    if (m_backendDb)
+        m_backendDb->addEntry(url, data);
+}
+
+ComponentBackendDb::Data BackendImpl::readDataFromDb(std::u16string_view url)
+{
+    ComponentBackendDb::Data data;
+    if (m_backendDb)
+        data = m_backendDb->getEntry(url);
+    return data;
+}
+
+void BackendImpl::revokeEntryFromDb(std::u16string_view url)
+{
+    if (m_backendDb)
+        m_backendDb->revokeEntry(url);
+}
+
+// XPackageRegistry
+
+Sequence< Reference<deployment::XPackageTypeInfo> >
+BackendImpl::getSupportedPackageTypes()
+{
+    return m_typeInfos;
+}
+
+void BackendImpl::packageRemoved(OUString const & url, OUString const & /*mediaType*/)
+{
+    if (m_backendDb)
+        m_backendDb->removeEntry(url);
+}
+
+// PackageRegistryBackend
+
+Reference<deployment::XPackage> BackendImpl::bindPackage_(
+    OUString const & url, OUString const & mediaType_,
+    bool bRemoved, OUString const & identifier,
+    Reference<XCommandEnvironment> const & xCmdEnv )
+{
+    OUString mediaType(mediaType_);
+    if ( mediaType.isEmpty() || mediaType == "application/vnd.sun.star.uno-component" || mediaType == "application/vnd.sun.star.uno-typelibrary" )
+    {
+        // detect exact media-type:
+        ::ucbhelper::Content ucbContent;
+        if (create_ucb_content( &ucbContent, url, xCmdEnv )) {
+            const OUString title( StrTitle::getTitle( ucbContent ) );
+            if (title.endsWithIgnoreAsciiCase(SAL_DLLEXTENSION))
+            {
+                mediaType = "application/vnd.sun.star.uno-component;type=native;platform=" +
+                    getPlatformString();
+            }
+            else if (title.endsWithIgnoreAsciiCase(".jar"))
+            {
+                if (jarManifestHeaderPresent(
+                        url, "RegistrationClassName", xCmdEnv ))
+                    mediaType = "application/vnd.sun.star.uno-component;type=Java";
+                if (mediaType.isEmpty())
+                    mediaType = "application/vnd.sun.star.uno-typelibrary;type=Java";
+            }
+            else if (title.endsWithIgnoreAsciiCase(".py"))
+                mediaType = "application/vnd.sun.star.uno-component;type=Python";
+            else if (title.endsWithIgnoreAsciiCase(".rdb"))
+                mediaType = "application/vnd.sun.star.uno-typelibrary;type=RDB";
+        }
+        if (mediaType.isEmpty())
+            throw lang::IllegalArgumentException(
+                StrCannotDetectMediaType() + url,
+                static_cast<OWeakObject *>(this), static_cast<sal_Int16>(-1) );
+    }
+
+    OUString type, subType;
+    INetContentTypeParameterList params;
+    if (INetContentTypes::parse( mediaType, type, subType, &params ))
+    {
+        if (type.equalsIgnoreAsciiCase("application"))
+        {
+            OUString name;
+            if (!bRemoved)
+            {
+                ::ucbhelper::Content ucbContent( url, xCmdEnv, m_xComponentContext );
+                name = StrTitle::getTitle( ucbContent );
+            }
+
+            if (subType.equalsIgnoreAsciiCase("vnd.sun.star.uno-component"))
+            {
+                // xxx todo: probe and evaluate component xml description
+
+                auto const iter = params.find(OString("platform"));
+                bool bPlatformFits(iter == params.end());
+                OUString aPlatform;
+                if (!bPlatformFits) // platform is specified, we have to check
+                {
+                    aPlatform = iter->second.m_sValue;
+                    bPlatformFits = platform_fits(aPlatform);
+                }
+                // If the package is being removed, do not care whether
+                // platform fits. We won't be using it anyway.
+                if (bPlatformFits || bRemoved) {
+                    auto const iterType = params.find(OString("type"));
+                    if (iterType != params.end())
+                    {
+                        OUString const & value = iterType->second.m_sValue;
+                        if (value.equalsIgnoreAsciiCase("native")) {
+                            if (bPlatformFits)
+                                return new BackendImpl::ComponentPackageImpl(
+                                    this, url, name, m_xDynComponentTypeInfo,
+                                    "com.sun.star.loader.SharedLibrary",
+                                    bRemoved, identifier);
+                            else
+                                return new BackendImpl::OtherPlatformPackageImpl(
+                                    this, url, name, m_xDynComponentTypeInfo,
+                                    bRemoved, identifier, aPlatform);
+                        }
+                        if (value.equalsIgnoreAsciiCase("Java")) {
+                            return new BackendImpl::ComponentPackageImpl(
+                                this, url, name, m_xJavaComponentTypeInfo,
+                                "com.sun.star.loader.Java2",
+                                bRemoved, identifier);
+                        }
+                        if (value.equalsIgnoreAsciiCase("Python")) {
+                            return new BackendImpl::ComponentPackageImpl(
+                                this, url, name, m_xPythonComponentTypeInfo,
+                                "com.sun.star.loader.Python",
+                                bRemoved, identifier);
+                        }
+                    }
+                }
+            }
+            else if (subType.equalsIgnoreAsciiCase("vnd.sun.star.uno-components"))
+            {
+                auto const iter = params.find(OString("platform"));
+                if (iter == params.end() || platform_fits(iter->second.m_sValue)) {
+                    return new BackendImpl::ComponentsPackageImpl(
+                        this, url, name, m_xComponentsTypeInfo, bRemoved,
+                        identifier);
+                }
+            }
+            else if (subType.equalsIgnoreAsciiCase( "vnd.sun.star.uno-typelibrary"))
+            {
+                auto const iter = params.find(OString("type"));
+                if (iter != params.end()) {
+                    OUString const & value = iter->second.m_sValue;
+                    if (value.equalsIgnoreAsciiCase("RDB"))
+                    {
+                        return new BackendImpl::TypelibraryPackageImpl(
+                            this, url, name, m_xRDBTypelibTypeInfo,
+                            false /* rdb */, bRemoved, identifier);
+                    }
+                    if (value.equalsIgnoreAsciiCase("Java")) {
+                        return new BackendImpl::TypelibraryPackageImpl(
+                            this, url, name, m_xJavaTypelibTypeInfo,
+                            true /* jar */, bRemoved, identifier);
+                    }
+                }
+            }
+        }
+    }
+    throw lang::IllegalArgumentException(
+        StrUnsupportedMediaType() + mediaType,
+        static_cast<OWeakObject *>(this),
+        static_cast<sal_Int16>(-1) );
+}
+
+
+void BackendImpl::unorc_verify_init(
+    Reference<XCommandEnvironment> const & xCmdEnv )
+{
+    if (transientMode())
+        return;
+    const ::osl::MutexGuard guard( m_aMutex );
+    if ( m_unorc_inited)
+        return;
+
+    // common rc:
+    ::ucbhelper::Content ucb_content;
+    if (create_ucb_content(
+            &ucb_content,
+            makeURL( getCachePath(), "unorc" ),
+            xCmdEnv, false /* no throw */ ))
+    {
+        OUString line;
+        if (readLine( &line, "UNO_JAVA_CLASSPATH=", ucb_content,
+                      RTL_TEXTENCODING_UTF8 ))
+        {
+            sal_Int32 index = sizeof ("UNO_JAVA_CLASSPATH=") - 1;
+            do {
+                OUString token( o3tl::trim(o3tl::getToken(line, 0, ' ', index )) );
+                if (!token.isEmpty())
+                {
+                    if (create_ucb_content(
+                            nullptr, expandUnoRcTerm(token), xCmdEnv,
+                            false /* no throw */ ))
+                    {
+                        //The jar file may not exist anymore if a shared or bundled
+                        //extension was removed, but it can still be in the unorc
+                        //After running XExtensionManager::synchronize, the unorc is
+                        //cleaned up
+                        m_jar_typelibs.push_back( token );
+                    }
+                }
+            }
+            while (index >= 0);
+        }
+        if (readLine( &line, "UNO_TYPES=", ucb_content,
+                      RTL_TEXTENCODING_UTF8 )) {
+            sal_Int32 index = sizeof ("UNO_TYPES=") - 1;
+            do {
+                OUString token( o3tl::trim(o3tl::getToken(line, 0, ' ', index )) );
+                if (!token.isEmpty())
+                {
+                    if (token[ 0 ] == '?')
+                        token = token.copy( 1 );
+                    if (create_ucb_content(
+                            nullptr, expandUnoRcTerm(token), xCmdEnv,
+                            false /* no throw */ ))
+                    {
+                         //The RDB file may not exist anymore if a shared or bundled
+                         //extension was removed, but it can still be in the unorc.
+                         //After running XExtensionManager::synchronize, the unorc is
+                         //cleaned up
+                         m_rdb_typelibs.push_back( token );
+                    }
+                }
+            }
+            while (index >= 0);
+        }
+        if (readLine( &line, "UNO_SERVICES=", ucb_content,
+                      RTL_TEXTENCODING_UTF8 ))
+        {
+            // The UNO_SERVICES line always has the BNF form
+            //  "UNO_SERVICES="
+            //  ("?$ORIGIN/" <common-rdb>)?                        -- first
+            //  "${$ORIGIN/${_OS}_${_ARCH}rc:UNO_SERVICES}"?       -- second
+            //  ("?" ("BUNDLED_EXTENSIONS" |                       -- third
+            //   "UNO_SHARED_PACKAGES_CACHE" | "UNO_USER_PACKAGES_CACHE")
+            //   ...)*
+            // so can unambiguously be split into its three parts:
+            int state = 1;
+            for (sal_Int32 i = RTL_CONSTASCII_LENGTH("UNO_SERVICES=");
+                 i >= 0;)
+            {
+                OUString token(line.getToken(0, ' ', i));
+                if (!token.isEmpty())
+                {
+                    if (state == 1 && token.match("?$ORIGIN/"))
+                    {
+                        m_commonRDB_orig = token.copy(
+                            RTL_CONSTASCII_LENGTH("?$ORIGIN/"));
+                        state = 2;
+                    }
+                    else if ( state <= 2 && token == "${$ORIGIN/${_OS}_${_ARCH}rc:UNO_SERVICES}" )
+                    {
+                        state = 3;
+                    }
+                    else
+                    {
+                        if (token[0] == '?')
+                        {
+                            token = token.copy(1);
+                        }
+                        m_components.push_back(token);
+                        state = 3;
+                    }
+                }
+            }
+        }
+
+        // native rc:
+        if (create_ucb_content(
+                &ucb_content,
+                makeURL( getCachePath(), getPlatformString() + "rc"),
+                xCmdEnv, false /* no throw */ )) {
+            if (readLine( &line, "UNO_SERVICES=", ucb_content,
+                          RTL_TEXTENCODING_UTF8 )) {
+                m_nativeRDB_orig = line.copy(
+                    sizeof ("UNO_SERVICES=?$ORIGIN/") - 1 );
+            }
+        }
+    }
+    m_unorc_modified = false;
+    m_unorc_inited = true;
+}
+
+
+void BackendImpl::unorc_flush( Reference<XCommandEnvironment> const & xCmdEnv )
+{
+    if (transientMode())
+        return;
+    if (!m_unorc_inited || !m_unorc_modified)
+        return;
+
+    OStringBuffer buf;
+
+    buf.append("ORIGIN=");
+    OUString sOrigin = dp_misc::makeRcTerm(m_cachePath);
+    OString osOrigin = OUStringToOString(sOrigin, RTL_TEXTENCODING_UTF8);
+    buf.append(osOrigin);
+    buf.append(LF);
+
+    if (! m_jar_typelibs.empty())
+    {
+        auto iPos( m_jar_typelibs.cbegin() );
+        auto const iEnd( m_jar_typelibs.cend() );
+        buf.append( "UNO_JAVA_CLASSPATH=" );
+        while (iPos != iEnd) {
+            // encoded ASCII file-urls:
+            const OString item(
+                OUStringToOString( *iPos, RTL_TEXTENCODING_ASCII_US ) );
+            buf.append( item );
+            ++iPos;
+            if (iPos != iEnd)
+                buf.append( ' ' );
+        }
+        buf.append(LF);
+    }
+    if (! m_rdb_typelibs.empty())
+    {
+        auto iPos( m_rdb_typelibs.cbegin() );
+        auto const iEnd( m_rdb_typelibs.cend() );
+        buf.append( "UNO_TYPES=" );
+        while (iPos != iEnd) {
+            buf.append( '?' );
+            // encoded ASCII file-urls:
+            const OString item(
+                OUStringToOString( *iPos, RTL_TEXTENCODING_ASCII_US ) );
+            buf.append( item );
+            ++iPos;
+            if (iPos != iEnd)
+                buf.append( ' ' );
+        }
+        buf.append(LF);
+    }
+
+    // If we duplicated the common or native rdb then we must use those urls
+    //otherwise we use those of the original files. That is, m_commonRDB_orig
+    //and m_nativeRDB_orig;
+    OUString sCommonRDB(m_commonRDB.isEmpty() ? m_commonRDB_orig : m_commonRDB );
+    OUString sNativeRDB(m_nativeRDB.isEmpty() ? m_nativeRDB_orig : m_nativeRDB );
+
+    if (!sCommonRDB.isEmpty() || !sNativeRDB.isEmpty() ||
+        !m_components.empty())
+    {
+        buf.append( "UNO_SERVICES=" );
+        bool space = false;
+        if (!sCommonRDB.isEmpty())
+        {
+            buf.append( "?$ORIGIN/" );
+            buf.append( OUStringToOString(
+                            sCommonRDB, RTL_TEXTENCODING_ASCII_US ) );
+            space = true;
+        }
+        if (!sNativeRDB.isEmpty())
+        {
+            if (space)
+            {
+                buf.append(' ');
+            }
+            buf.append( "${$ORIGIN/${_OS}_${_ARCH}rc:UNO_SERVICES}" );
+            space = true;
+
+            // write native rc:
+            OString buf2 =
+                "ORIGIN=" +
+                osOrigin +
+                OStringChar(LF) +
+                "UNO_SERVICES=?$ORIGIN/"  +
+                OUStringToOString( sNativeRDB, RTL_TEXTENCODING_ASCII_US ) +
+                OStringChar(LF);
+
+            const Reference<io::XInputStream> xData(
+                ::xmlscript::createInputStream(
+                        reinterpret_cast<sal_Int8 const *>(buf2.getStr()),
+                        buf2.getLength() ) );
+            ::ucbhelper::Content ucb_content(
+                makeURL( getCachePath(), getPlatformString() + "rc" ),
+                xCmdEnv, m_xComponentContext );
+            ucb_content.writeStream( xData, true /* replace existing */ );
+        }
+        for (auto const& component : m_components)
+        {
+            if (space)
+            {
+                buf.append(' ');
+            }
+            buf.append('?');
+            buf.append(OUStringToOString(component, RTL_TEXTENCODING_UTF8));
+            space = true;
+        }
+        buf.append(LF);
+    }
+
+    // write unorc:
+    const Reference<io::XInputStream> xData(
+        ::xmlscript::createInputStream(
+                reinterpret_cast<sal_Int8 const *>(buf.getStr()),
+                buf.getLength() ) );
+    ::ucbhelper::Content ucb_content(
+        makeURL( getCachePath(), "unorc" ), xCmdEnv, m_xComponentContext );
+    ucb_content.writeStream( xData, true /* replace existing */ );
+
+    m_unorc_modified = false;
+}
+
+
+void BackendImpl::addToUnoRc( RcItem kind, OUString const & url_,
+                              Reference<XCommandEnvironment> const & xCmdEnv )
+{
+    const OUString rcterm( dp_misc::makeRcTerm(url_) );
+    const ::osl::MutexGuard guard( m_aMutex );
+    unorc_verify_init( xCmdEnv );
+    std::deque<OUString> & rSet = getRcItemList(kind);
+    if (std::find( rSet.begin(), rSet.end(), rcterm ) == rSet.end()) {
+        rSet.push_front( rcterm ); // prepend to list, thus overriding
+        // write immediately:
+        m_unorc_modified = true;
+        unorc_flush( xCmdEnv );
+    }
+}
+
+
+void BackendImpl::removeFromUnoRc(
+    RcItem kind, OUString const & url_,
+    Reference<XCommandEnvironment> const & xCmdEnv )
+{
+    const OUString rcterm( dp_misc::makeRcTerm(url_) );
+    const ::osl::MutexGuard guard( m_aMutex );
+    unorc_verify_init( xCmdEnv );
+    std::deque<OUString> & aRcItemList = getRcItemList(kind);
+    aRcItemList.erase(std::remove(aRcItemList.begin(), aRcItemList.end(), rcterm), aRcItemList.end());
+    // write immediately:
+    m_unorc_modified = true;
+    unorc_flush( xCmdEnv );
+}
+
+
+bool BackendImpl::hasInUnoRc(
+    RcItem kind, OUString const & url_ )
+{
+    const OUString rcterm( dp_misc::makeRcTerm(url_) );
+    const ::osl::MutexGuard guard( m_aMutex );
+    std::deque<OUString> const & rSet = getRcItemList(kind);
+    return std::find( rSet.begin(), rSet.end(), rcterm ) != rSet.end();
+}
+
+css::uno::Reference< css::uno::XComponentContext > BackendImpl::getRootContext()
+    const
+{
+    css::uno::Reference< css::uno::XComponentContext > rootContext(
+        getComponentContext()->getValueByName("_root"),
+        css::uno::UNO_QUERY);
+    return rootContext.is() ? rootContext : getComponentContext();
+}
+
+
+void BackendImpl::releaseObject( OUString const & id )
+{
+    const ::osl::MutexGuard guard( m_aMutex );
+    m_backendObjects.erase( id );
+}
+
+
+Reference<XInterface> BackendImpl::getObject( OUString const & id )
+{
+    const ::osl::MutexGuard guard( m_aMutex );
+    const t_string2object::const_iterator iFind( m_backendObjects.find( id ) );
+    if (iFind == m_backendObjects.end())
+        return Reference<XInterface>();
+    else
+        return iFind->second;
+}
+
+
+Reference<XInterface> BackendImpl::insertObject(
+    OUString const & id, Reference<XInterface> const & xObject )
+{
+    const ::osl::MutexGuard guard( m_aMutex );
+    const std::pair<t_string2object::iterator, bool> insertion(
+        m_backendObjects.emplace( id, xObject ) );
+    return insertion.first->second;
+}
+
+
+Reference<XComponentContext> raise_uno_process(
+    Reference<XComponentContext> const & xContext,
+    ::rtl::Reference<AbortChannel> const & abortChannel )
+{
+    OSL_ASSERT( xContext.is() );
+
+    OUString url( util::theMacroExpander::get(xContext)->expandMacros( "$URE_BIN_DIR/uno" ) );
+
+    const OUString connectStr = "uno:pipe,name=" + generateRandomPipeId() + ";urp;uno.ComponentContext";
+
+    // raise core UNO process to register/run a component,
+    // javavm service uses unorc next to executable to retrieve deployed
+    // jar typelibs
+
+    std::vector<OUString> args{
+#if OSL_DEBUG_LEVEL == 0
+        "--quiet",
+#endif
+        "--singleaccept",
+        "-u",
+        connectStr,
+        // don't inherit from unorc:
+        "-env:INIFILENAME=" };
+
+    //now add the bootstrap variables which were supplied on the command line
+    std::vector<OUString> bootvars = getCmdBootstrapVariables();
+    args.insert(args.end(), bootvars.begin(), bootvars.end());
+
+    oslProcess hProcess;
+    try {
+        hProcess = raiseProcess(
+            url, comphelper::containerToSequence(args) );
+    }
+    catch (...) {
+        OUStringBuffer sMsg = "error starting process: " + url;
+        for(const auto& arg : args)
+            sMsg.append(" " + arg);
+        throw uno::RuntimeException(sMsg.makeStringAndClear());
+    }
+    try {
+        return Reference<XComponentContext>(
+            resolveUnoURL( connectStr, xContext, abortChannel.get() ),
+            UNO_QUERY_THROW );
+    }
+    catch (...) {
+        // try to terminate process:
+        if ( osl_terminateProcess( hProcess ) != osl_Process_E_None )
+        {
+            OSL_ASSERT( false );
+        }
+        throw;
+    }
+}
+
+void extractComponentData(
+    css::uno::Reference< css::uno::XComponentContext > const & context,
+    css::uno::Reference< css::registry::XRegistryKey > const & registry,
+    ComponentBackendDb::Data * data,
+    std::vector< css::uno::Reference< css::uno::XInterface > > * factories,
+    css::uno::Reference< css::loader::XImplementationLoader > const &
+        componentLoader,
+    OUString const & componentUrl)
+{
+    OSL_ASSERT(
+        context.is() && registry.is() && data != nullptr && componentLoader.is());
+    OUString registryName(registry->getKeyName());
+    sal_Int32 prefix = registryName.getLength();
+    if (!registryName.endsWith("/")) {
+        prefix += RTL_CONSTASCII_LENGTH("/");
+    }
+    const css::uno::Sequence< css::uno::Reference< css::registry::XRegistryKey > >
+        keys(registry->openKeys());
+    css::uno::Reference< css::lang::XMultiComponentFactory > smgr(
+        context->getServiceManager(), css::uno::UNO_SET_THROW);
+    for (css::uno::Reference< css::registry::XRegistryKey > const & key : keys) {
+        OUString name(key->getKeyName().copy(prefix));
+        data->implementationNames.push_back(name);
+        css::uno::Reference< css::registry::XRegistryKey > singletons(
+            key->openKey("UNO/SINGLETONS"));
+        if (singletons.is()) {
+            sal_Int32 prefix2 = key->getKeyName().getLength() +
+                RTL_CONSTASCII_LENGTH("/UNO/SINGLETONS/");
+            const css::uno::Sequence<
+                css::uno::Reference< css::registry::XRegistryKey > >
+                singletonKeys(singletons->openKeys());
+            for (css::uno::Reference< css::registry::XRegistryKey > const & singletonKey : singletonKeys) {
+                data->singletons.emplace_back(
+                        singletonKey->getKeyName().copy(prefix2), name);
+            }
+        }
+        if (factories != nullptr) {
+            factories->push_back(
+                componentLoader->activate(
+                    name, OUString(), componentUrl, key));
+        }
+    }
+}
+
+void BackendImpl::ComponentPackageImpl::getComponentInfo(
+    ComponentBackendDb::Data * data,
+    std::vector< css::uno::Reference< css::uno::XInterface > > * factories,
+    Reference<XComponentContext> const & xContext )
+{
+    const Reference<loader::XImplementationLoader> xLoader(
+        xContext->getServiceManager()->createInstanceWithContext(
+            m_loader, xContext ), UNO_QUERY );
+    if (! xLoader.is())
+    {
+        throw css::deployment::DeploymentException(
+            "cannot instantiate loader " + m_loader,
+            static_cast< OWeakObject * >(this), Any());
+    }
+
+    // HACK: highly dependent on stoc/source/servicemanager
+    //       and stoc/source/implreg implementation which rely on the same
+    //       services.rdb format!
+    //       .../UNO/LOCATION and .../UNO/ACTIVATOR appear not to be written by
+    //       writeRegistryInfo, however, but are known, fixed values here, so
+    //       can be passed into extractComponentData
+    OUString url(getURL());
+    const Reference<registry::XSimpleRegistry> xMemReg(
+        xContext->getServiceManager()->createInstanceWithContext(
+            "com.sun.star.registry.SimpleRegistry", xContext ),
+        UNO_QUERY_THROW );
+    xMemReg->open( OUString() /* in mem */, false, true );
+    xLoader->writeRegistryInfo( xMemReg->getRootKey(), OUString(), url );
+    extractComponentData(
+        xContext, xMemReg->getRootKey(), data, factories, xLoader, url);
+}
+
+void BackendImpl::ComponentPackageImpl::componentLiveInsertion(
+    ComponentBackendDb::Data const & data,
+    std::vector< css::uno::Reference< css::uno::XInterface > > const &
+        factories)
+{
+    css::uno::Reference< css::uno::XComponentContext > rootContext(
+        getMyBackend()->getRootContext());
+    css::uno::Reference< css::container::XSet > set(
+        rootContext->getServiceManager(), css::uno::UNO_QUERY_THROW);
+    std::vector< css::uno::Reference< css::uno::XInterface > >::const_iterator
+        factory(factories.begin());
+    for (auto const& implementationName : data.implementationNames)
+    {
+        try {
+            set->insert(css::uno::Any(*factory++));
+        } catch (const container::ElementExistException &) {
+            SAL_WARN("desktop.deployment", "implementation already registered " << implementationName);
+        }
+    }
+    if (data.singletons.empty())        return;
+
+    css::uno::Reference< css::container::XNameContainer > cont(
+        rootContext, css::uno::UNO_QUERY_THROW);
+    for (auto const& singleton : data.singletons)
+    {
+        OUString name("/singletons/" + singleton.first);
+        //TODO: Update should be atomic:
+        try {
+            cont->removeByName( name + "/arguments");
+        } catch (const container::NoSuchElementException &) {}
+        try {
+            cont->insertByName( name + "/service", css::uno::Any(singleton.second));
+        } catch (const container::ElementExistException &) {
+            cont->replaceByName( name + "/service", css::uno::Any(singleton.second));
+        }
+        try {
+            cont->insertByName(name, css::uno::Any());
+        } catch (const container::ElementExistException &) {
+            SAL_WARN("desktop.deployment", "singleton already registered " << singleton.first);
+            cont->replaceByName(name, css::uno::Any());
+        }
+    }
+}
+
+void BackendImpl::ComponentPackageImpl::componentLiveRemoval(
+    ComponentBackendDb::Data const & data)
+{
+    css::uno::Reference< css::uno::XComponentContext > rootContext(
+        getMyBackend()->getRootContext());
+    css::uno::Reference< css::container::XSet > set(
+        rootContext->getServiceManager(), css::uno::UNO_QUERY_THROW);
+    for (auto const& implementationName : data.implementationNames)
+    {
+        try {
+            set->remove(css::uno::Any(implementationName));
+        } catch (const css::container::NoSuchElementException &) {
+            // ignore if factory has not been live deployed
+        }
+    }
+    if (data.singletons.empty())
+        return;
+
+    css::uno::Reference< css::container::XNameContainer > cont(
+        rootContext, css::uno::UNO_QUERY_THROW);
+    for (auto const& singleton : data.singletons)
+    {
+        OUString name("/singletons/" + singleton.first);
+        //TODO: Removal should be atomic:
+        try {
+            cont->removeByName(name);
+        } catch (const container::NoSuchElementException &) {}
+        try {
+            cont->removeByName( name + "/service" );
+        } catch (const container::NoSuchElementException &) {}
+        try {
+            cont->removeByName( name + "/arguments" );
+        } catch (const container::NoSuchElementException &) {}
+    }
+}
+
+// Package
+
+//We could use here BackendImpl::hasActiveEntry. However, this check is just as well.
+//And it also shows the problem if another extension has overwritten an implementation
+//entry, because it contains the same service implementation
+beans::Optional< beans::Ambiguous<sal_Bool> >
+BackendImpl::ComponentPackageImpl::isRegistered_(
+    ::osl::ResettableMutexGuard &,
+    ::rtl::Reference<AbortChannel> const & abortChannel,
+    Reference<XCommandEnvironment> const & )
+{
+    if (m_registered == Reg::Uninit)
+    {
+        m_registered = Reg::NotRegistered;
+        const Reference<registry::XSimpleRegistry> xRDB( getRDB() );
+        if (xRDB.is())
+        {
+            bool bAmbiguousComponentName = false;
+            // lookup rdb for location URL:
+            const Reference<registry::XRegistryKey> xRootKey(
+                xRDB->getRootKey() );
+            const Reference<registry::XRegistryKey> xImplKey(
+                xRootKey->openKey( "IMPLEMENTATIONS" ) );
+            Sequence<OUString> implNames;
+            if (xImplKey.is() && xImplKey->isValid())
+                implNames = xImplKey->getKeyNames();
+            OUString const * pImplNames = implNames.getConstArray();
+            sal_Int32 pos = implNames.getLength();
+            for ( ; pos--; )
+            {
+                checkAborted( abortChannel );
+                const OUString key(
+                    pImplNames[ pos ] + "/UNO/LOCATION" );
+                const Reference<registry::XRegistryKey> xKey(
+                    xRootKey->openKey(key) );
+                if (xKey.is() && xKey->isValid())
+                {
+                    const OUString location( xKey->getAsciiValue() );
+                    if (location.equalsIgnoreAsciiCase( getURL() ))
+                    {
+                        break;
+                    }
+                    else
+                    {
+                        //try to match only the file name
+                        OUString thisUrl(getURL());
+                        std::u16string_view thisFileName(thisUrl.subView(thisUrl.lastIndexOf('/')));
+
+                        std::u16string_view locationFileName(location.subView(location.lastIndexOf('/')));
+                        if (o3tl::equalsIgnoreAsciiCase(locationFileName, thisFileName))
+                            bAmbiguousComponentName = true;
+                    }
+                }
+            }
+            if (pos >= 0)
+                m_registered = Reg::Registered;
+            else if (bAmbiguousComponentName)
+                m_registered = Reg::MaybeRegistered;
+        }
+    }
+
+    //Different extensions can use the same service implementations. Then the extensions
+    //which was installed last will overwrite the one from the other extension. That is
+    //the registry will contain the path (the location) of the library or jar of the
+    //second extension. In this case isRegistered called for the lib of the first extension
+    //would return "not registered". That would mean that during uninstallation
+    //XPackage::registerPackage is not called, because it just was not registered. This is,
+    //however, necessary for jar files. Registering and unregistering update
+    //uno_packages/cache/registry/com.sun.star.comp.deployment.component.PackageRegistryBackend/unorc
+    //Therefore, we will return always "is ambiguous" if the path of this component cannot
+    //be found in the registry and if there is another path and both have the same file name (but
+    //the rest of the path is different).
+    //If the caller cannot precisely determine that this package was registered, then it must
+    //call registerPackage.
+    bool bAmbiguous = m_registered == Reg::Void // Reg::Void == we are in the progress of unregistration
+        || m_registered == Reg::MaybeRegistered;
+    return beans::Optional< beans::Ambiguous<sal_Bool> >(
+        true /* IsPresent */,
+        beans::Ambiguous<sal_Bool>(
+            m_registered == Reg::Registered, bAmbiguous) );
+}
+
+
+void BackendImpl::ComponentPackageImpl::processPackage_(
+    ::osl::ResettableMutexGuard &,
+    bool doRegisterPackage,
+    bool startup,
+    ::rtl::Reference<AbortChannel> const & abortChannel,
+    Reference<XCommandEnvironment> const & xCmdEnv )
+{
+    BackendImpl * that = getMyBackend();
+    OUString url(getURL());
+    if (doRegisterPackage) {
+        ComponentBackendDb::Data data;
+        css::uno::Reference< css::uno::XComponentContext > context;
+        if (startup) {
+            context = that->getComponentContext();
+        } else {
+            context.set(that->getObject(url), css::uno::UNO_QUERY);
+            if (!context.is()) {
+                context.set(
+                    that->insertObject(
+                        url,
+                        raise_uno_process(
+                            that->getComponentContext(), abortChannel)),
+                    css::uno::UNO_QUERY_THROW);
+            }
+        }
+        css::uno::Reference< css::registry::XImplementationRegistration> impreg(
+            context->getServiceManager()->createInstanceWithContext(
+                "com.sun.star.registry.ImplementationRegistration",
+                context),
+            css::uno::UNO_QUERY_THROW);
+        css::uno::Reference< css::registry::XSimpleRegistry > rdb(getRDB());
+        impreg->registerImplementation(m_loader, url, rdb);
+        // Only write to unorc after successful registration; it may fail if
+        // there is no suitable java
+        if (m_loader == "com.sun.star.loader.Java2" && !jarManifestHeaderPresent(url, "UNO-Type-Path", xCmdEnv))
+        {
+            that->addToUnoRc(RCITEM_JAR_TYPELIB, url, xCmdEnv);
+            data.javaTypeLibrary = true;
+        }
+        std::vector< css::uno::Reference< css::uno::XInterface > > factories;
+        getComponentInfo(&data, startup ? nullptr : &factories, context);
+        if (!startup) {
+            try {
+                componentLiveInsertion(data, factories);
+            } catch (css::uno::Exception &) {
+                TOOLS_INFO_EXCEPTION("desktop.deployment", "caught");
+                try {
+                    impreg->revokeImplementation(url, rdb);
+                } catch (css::uno::RuntimeException &) {
+                    TOOLS_WARN_EXCEPTION("desktop.deployment", "ignored");
+                }
+                throw;
+            }
+        }
+        m_registered = Reg::Registered;
+        that->addDataToDb(url, data);
+    } else { // revoke
+        m_registered = Reg::Void;
+        ComponentBackendDb::Data data(that->readDataFromDb(url));
+        css::uno::Reference< css::uno::XComponentContext > context(
+            that->getObject(url), css::uno::UNO_QUERY);
+        bool remoteContext = context.is();
+        if (!remoteContext) {
+            context = that->getComponentContext();
+        }
+        if (!startup) {
+            componentLiveRemoval(data);
+        }
+        css::uno::Reference< css::registry::XImplementationRegistration >(
+            context->getServiceManager()->createInstanceWithContext(
+                "com.sun.star.registry.ImplementationRegistration",
+                context),
+            css::uno::UNO_QUERY_THROW)->revokeImplementation(url, getRDB());
+        if (data.javaTypeLibrary) {
+            that->removeFromUnoRc(RCITEM_JAR_TYPELIB, url, xCmdEnv);
+        }
+        if (remoteContext) {
+            that->releaseObject(url);
+        }
+        m_registered = Reg::NotRegistered;
+        getMyBackend()->revokeEntryFromDb(url);
+    }
+}
+
+BackendImpl::TypelibraryPackageImpl::TypelibraryPackageImpl(
+    ::rtl::Reference<PackageRegistryBackend> const & myBackend,
+    OUString const & url, OUString const & name,
+    Reference<deployment::XPackageTypeInfo> const & xPackageType,
+    bool jarFile, bool bRemoved, OUString const & identifier)
+    : Package( myBackend, url, name, name /* display-name */,
+               xPackageType, bRemoved, identifier),
+      m_jarFile( jarFile )
+{
+}
+
+// Package
+BackendImpl * BackendImpl::TypelibraryPackageImpl::getMyBackend() const
+{
+    BackendImpl * pBackend = static_cast<BackendImpl *>(m_myBackend.get());
+    if (nullptr == pBackend)
+    {
+        //May throw a DisposedException
+        check();
+        //We should never get here...
+        throw RuntimeException( "Failed to get the BackendImpl",
+            static_cast<OWeakObject*>(const_cast<TypelibraryPackageImpl *>(this)));
+    }
+    return pBackend;
+}
+
+beans::Optional< beans::Ambiguous<sal_Bool> >
+BackendImpl::TypelibraryPackageImpl::isRegistered_(
+    ::osl::ResettableMutexGuard &,
+    ::rtl::Reference<AbortChannel> const &,
+    Reference<XCommandEnvironment> const & )
+{
+    BackendImpl * that = getMyBackend();
+    return beans::Optional< beans::Ambiguous<sal_Bool> >(
+        true /* IsPresent */,
+        beans::Ambiguous<sal_Bool>(
+            that->hasInUnoRc(
+                m_jarFile ? RCITEM_JAR_TYPELIB : RCITEM_RDB_TYPELIB, getURL() ),
+            false /* IsAmbiguous */ ) );
+}
+
+
+void BackendImpl::TypelibraryPackageImpl::processPackage_(
+    ::osl::ResettableMutexGuard &,
+    bool doRegisterPackage,
+    bool /*startup*/,
+    ::rtl::Reference<AbortChannel> const &,
+    Reference<XCommandEnvironment> const & xCmdEnv )
+{
+    BackendImpl * that = getMyBackend();
+    const OUString url( getURL() );
+
+    if (doRegisterPackage)
+    {
+        // live insertion:
+        if (m_jarFile) {
+            // xxx todo add to classpath at runtime: ???
+            //SB: It is probably not worth it to add the live inserted type
+            // library JAR to the UnoClassLoader in the soffice process.  Any
+            // live inserted component JAR that might reference this type
+            // library JAR runs in its own uno process, so there is probably no
+            // Java code in the soffice process that would see any UNO types
+            // introduced by this type library JAR.
+        }
+        else // RDB:
+        {
+            css::uno::Reference< css::container::XSet >(
+                that->getComponentContext()->getValueByName(
+                    "/singletons"
+                    "/com.sun.star.reflection.theTypeDescriptionManager"),
+                css::uno::UNO_QUERY_THROW)->insert(
+                    css::uno::Any(expandUnoRcUrl(url)));
+        }
+
+        that->addToUnoRc( m_jarFile ? RCITEM_JAR_TYPELIB : RCITEM_RDB_TYPELIB,
+                          url, xCmdEnv );
+    }
+    else // revokePackage()
+    {
+        that->removeFromUnoRc(
+            m_jarFile ? RCITEM_JAR_TYPELIB : RCITEM_RDB_TYPELIB, url, xCmdEnv );
+
+        // revoking types at runtime, possible, sensible?
+        if (!m_jarFile) {
+            css::uno::Reference< css::container::XSet >(
+                that->getComponentContext()->getValueByName(
+                    "/singletons"
+                    "/com.sun.star.reflection.theTypeDescriptionManager"),
+                css::uno::UNO_QUERY_THROW)->remove(
+                    css::uno::Any(expandUnoRcUrl(url)));
+        }
+    }
+}
+
+BackendImpl::OtherPlatformPackageImpl::OtherPlatformPackageImpl(
+    ::rtl::Reference<PackageRegistryBackend> const & myBackend,
+    OUString const & url, OUString const & name,
+    Reference<deployment::XPackageTypeInfo> const & xPackageType,
+    bool bRemoved, OUString const & identifier, OUString platform)
+    : Package(myBackend, url, name, name, xPackageType, bRemoved, identifier)
+    , m_aPlatform(std::move(platform))
+{
+    OSL_PRECOND(bRemoved, "this class can only be used for removing packages!");
+}
+
+BackendImpl *
+BackendImpl::OtherPlatformPackageImpl::getMyBackend() const
+{
+    BackendImpl * pBackend = static_cast<BackendImpl *>(m_myBackend.get());
+    if (nullptr == pBackend)
+    {
+        //Throws a DisposedException
+        check();
+        //We should never get here...
+        throw RuntimeException("Failed to get the BackendImpl",
+            static_cast<OWeakObject*>(const_cast<OtherPlatformPackageImpl*>(this)));
+    }
+    return pBackend;
+}
+
+Reference<registry::XSimpleRegistry>
+BackendImpl::OtherPlatformPackageImpl::impl_openRDB() const
+{
+    OUString const aRDB(m_aPlatform + ".rdb");
+    OUString const aRDBPath(makeURL(getMyBackend()->getCachePath(), aRDB));
+
+    Reference<registry::XSimpleRegistry> xRegistry;
+
+    try
+    {
+        xRegistry.set(
+                impl_createInstance("com.sun.star.registry.SimpleRegistry"),
+                UNO_QUERY)
+            ;
+        if (xRegistry.is())
+            xRegistry->open(expandUnoRcUrl(aRDBPath), false, false);
+    }
+    catch (registry::InvalidRegistryException const&)
+    {
+        // If the registry does not exist, we do not need to bother at all
+        xRegistry.set(nullptr);
+    }
+
+    SAL_WARN_IF( !xRegistry.is(), "desktop.deployment", "could not create registry for the package's platform");
+    return xRegistry;
+}
+
+Reference<XInterface>
+BackendImpl::OtherPlatformPackageImpl::impl_createInstance(OUString const& rService)
+const
+{
+    Reference<XComponentContext> const xContext(getMyBackend()->getComponentContext());
+    OSL_ASSERT(xContext.is());
+    Reference<XInterface> xService;
+    if (xContext.is())
+        xService.set(xContext->getServiceManager()->createInstanceWithContext(rService, xContext));
+    return xService;
+}
+
+beans::Optional<beans::Ambiguous<sal_Bool> >
+BackendImpl::OtherPlatformPackageImpl::isRegistered_(
+    ::osl::ResettableMutexGuard& /* guard */,
+    ::rtl::Reference<AbortChannel> const& /* abortChannel */,
+    Reference<XCommandEnvironment> const& /* xCmdEnv */ )
+{
+    return beans::Optional<beans::Ambiguous<sal_Bool> >(true,
+            beans::Ambiguous<sal_Bool>(true, false));
+}
+
+void
+BackendImpl::OtherPlatformPackageImpl::processPackage_(
+    ::osl::ResettableMutexGuard& /* guard */,
+    bool bRegisterPackage,
+    bool /* bStartup */,
+    ::rtl::Reference<AbortChannel> const& /* abortChannel */,
+    Reference<XCommandEnvironment> const& /* xCmdEnv */)
+{
+    OSL_PRECOND(!bRegisterPackage, "this class can only be used for removing packages!");
+
+    OUString const aURL(getURL());
+
+    Reference<registry::XSimpleRegistry> const xServicesRDB(impl_openRDB());
+    Reference<registry::XImplementationRegistration> const xImplReg(
+            impl_createInstance("com.sun.star.registry.ImplementationRegistration"),
+            UNO_QUERY)
+        ;
+    if (xImplReg.is() && xServicesRDB.is())
+        xImplReg->revokeImplementation(aURL, xServicesRDB);
+    if (xServicesRDB.is())
+        xServicesRDB->close();
+
+    getMyBackend()->revokeEntryFromDb(aURL);
+}
+
+BackendImpl * BackendImpl::ComponentsPackageImpl::getMyBackend() const
+{
+    BackendImpl * pBackend = static_cast<BackendImpl *>(m_myBackend.get());
+    if (nullptr == pBackend)
+    {
+        //Throws a DisposedException
+        check();
+        //We should never get here...
+        throw RuntimeException("Failed to get the BackendImpl",
+            static_cast<OWeakObject*>(const_cast<ComponentsPackageImpl *>(this)));
+    }
+    return pBackend;
+}
+
+beans::Optional< beans::Ambiguous<sal_Bool> >
+BackendImpl::ComponentsPackageImpl::isRegistered_(
+    ::osl::ResettableMutexGuard &,
+    ::rtl::Reference<AbortChannel> const &,
+    Reference<XCommandEnvironment> const & )
+{
+    return beans::Optional< beans::Ambiguous<sal_Bool> >(
+        true,
+        beans::Ambiguous<sal_Bool>(
+            getMyBackend()->hasInUnoRc(RCITEM_COMPONENTS, getURL()), false));
+}
+
+void BackendImpl::ComponentsPackageImpl::processPackage_(
+    ::osl::ResettableMutexGuard &,
+    bool doRegisterPackage,
+    bool startup,
+    ::rtl::Reference<AbortChannel> const & abortChannel,
+    Reference<XCommandEnvironment> const & xCmdEnv )
+{
+    BackendImpl * that = getMyBackend();
+    OUString url(getURL());
+    if (doRegisterPackage) {
+        if (!startup) {
+            css::uno::Reference< css::uno::XComponentContext > context(
+                that->getObject(url), css::uno::UNO_QUERY);
+            if (!context.is()) {
+                context.set(
+                    that->insertObject(
+                        url,
+                        raise_uno_process(
+                            that->getComponentContext(), abortChannel)),
+                    css::uno::UNO_QUERY_THROW);
+            }
+            // This relies on the root component context's service manager
+            // supporting the extended XSet semantics:
+            css::uno::Sequence< css::beans::NamedValue > args
+            {
+                { "uri", css::uno::Any(expandUnoRcUrl(url)) },
+                { "component-context", css::uno::Any(context) }
+            };
+            css::uno::Reference< css::container::XSet > smgr(
+                that->getRootContext()->getServiceManager(),
+                css::uno::UNO_QUERY_THROW);
+            smgr->insert(css::uno::Any(args));
+        }
+        that->addToUnoRc(RCITEM_COMPONENTS, url, xCmdEnv);
+    } else { // revoke
+        that->removeFromUnoRc(RCITEM_COMPONENTS, url, xCmdEnv);
+        if (!startup) {
+            // This relies on the root component context's service manager
+            // supporting the extended XSet semantics:
+            css::uno::Sequence< css::beans::NamedValue > args { { "uri", css::uno::Any(expandUnoRcUrl(url)) } };
+            css::uno::Reference< css::container::XSet > smgr(
+                that->getRootContext()->getServiceManager(),
+                css::uno::UNO_QUERY_THROW);
+            smgr->remove(css::uno::Any(args));
+        }
+        that->releaseObject(url);
+        that->revokeEntryFromDb(url); // in case it got added with old code
+    }
+}
+
+BackendImpl::ComponentsPackageImpl::ComponentsPackageImpl(
+    ::rtl::Reference<PackageRegistryBackend> const & myBackend,
+    OUString const & url, OUString const & name,
+    Reference<deployment::XPackageTypeInfo> const & xPackageType,
+    bool bRemoved, OUString const & identifier)
+    : Package( myBackend, url, name, name /* display-name */,
+               xPackageType, bRemoved, identifier)
+{}
+
+} // anon namespace
+
+} // namespace dp_registry
+
+
+extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface*
+com_sun_star_comp_deployment_component_PackageRegistryBackend_get_implementation(
+    css::uno::XComponentContext* context, css::uno::Sequence<css::uno::Any> const& args)
+{
+    return cppu::acquire(new dp_registry::backend::component::BackendImpl(args, context));
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/desktop/source/deployment/registry/configuration/dp_configuration.cxx b/desktop/source/deployment/registry/configuration/dp_configuration.cxx
new file mode 100644
index 000000000..62d5ab88f
--- /dev/null
+++ b/desktop/source/deployment/registry/configuration/dp_configuration.cxx
@@ -0,0 +1,818 @@
+/* -*- 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 .
+ */
+
+//TODO: Large parts of this file were copied from dp_component.cxx; those parts
+// should be consolidated.
+
+#include <config_extensions.h>
+
+#include <dp_backend.h>
+#if HAVE_FEATURE_EXTENSIONS
+#include <dp_persmap.h>
+#endif
+#include <dp_misc.h>
+#include <dp_ucb.h>
+#include <rtl/string.hxx>
+#include <rtl/strbuf.hxx>
+#include <rtl/ustrbuf.hxx>
+#include <cppuhelper/exc_hlp.hxx>
+#include <cppuhelper/supportsservice.hxx>
+#include <ucbhelper/content.hxx>
+#include <unotools/ucbhelper.hxx>
+#include <xmlscript/xml_helper.hxx>
+#include <comphelper/lok.hxx>
+#include <svl/inettype.hxx>
+#include <o3tl/string_view.hxx>
+#include <com/sun/star/configuration/Update.hpp>
+#include <com/sun/star/lang/IllegalArgumentException.hpp>
+#include <com/sun/star/lang/WrappedTargetRuntimeException.hpp>
+#include <deque>
+#include <memory>
+#include <string_view>
+#include <utility>
+
+#include "dp_configurationbackenddb.hxx"
+
+using namespace ::dp_misc;
+using namespace ::com::sun::star;
+using namespace ::com::sun::star::uno;
+using namespace ::com::sun::star::ucb;
+
+namespace dp_registry::backend::configuration {
+namespace {
+
+class BackendImpl : public ::dp_registry::backend::PackageRegistryBackend
+{
+    class PackageImpl : public ::dp_registry::backend::Package
+    {
+        BackendImpl * getMyBackend() const ;
+
+        const bool m_isSchema;
+
+        // Package
+        virtual beans::Optional< beans::Ambiguous<sal_Bool> > isRegistered_(
+            ::osl::ResettableMutexGuard & guard,
+            ::rtl::Reference<AbortChannel> const & abortChannel,
+            Reference<XCommandEnvironment> const & xCmdEnv ) override;
+        virtual void processPackage_(
+            ::osl::ResettableMutexGuard & guard,
+            bool registerPackage,
+            bool startup,
+            ::rtl::Reference<AbortChannel> const & abortChannel,
+            Reference<XCommandEnvironment> const & xCmdEnv ) override;
+
+    public:
+        PackageImpl(
+            ::rtl::Reference<PackageRegistryBackend> const & myBackend,
+            OUString const & url, OUString const & name,
+            Reference<deployment::XPackageTypeInfo> const & xPackageType,
+            bool isSchema, bool bRemoved, OUString const & identifier)
+            : Package( myBackend, url, name, name /* display-name */,
+                       xPackageType, bRemoved, identifier),
+              m_isSchema( isSchema )
+            {}
+    };
+    friend class PackageImpl;
+
+    std::deque<OUString> m_xcs_files;
+    std::deque<OUString> m_xcu_files;
+    std::deque<OUString> & getFiles( bool xcs ) {
+        return xcs ? m_xcs_files : m_xcu_files;
+    }
+
+    bool m_configmgrini_inited;
+    bool m_configmgrini_modified;
+    std::unique_ptr<ConfigurationBackendDb> m_backendDb;
+
+    // PackageRegistryBackend
+    virtual Reference<deployment::XPackage> bindPackage_(
+        OUString const & url, OUString const & mediaType, bool bRemoved,
+        OUString const & identifier,
+        Reference<XCommandEnvironment> const & xCmdEnv ) override;
+
+#if HAVE_FEATURE_EXTENSIONS
+    // for backwards compatibility - nil if no (compatible) back-compat db present
+    std::unique_ptr<PersistentMap> m_registeredPackages;
+#endif
+
+    virtual void SAL_CALL disposing() override;
+
+    const Reference<deployment::XPackageTypeInfo> m_xConfDataTypeInfo;
+    const Reference<deployment::XPackageTypeInfo> m_xConfSchemaTypeInfo;
+    Sequence< Reference<deployment::XPackageTypeInfo> > m_typeInfos;
+
+    void configmgrini_verify_init(
+        Reference<XCommandEnvironment> const & xCmdEnv );
+    void configmgrini_flush( Reference<XCommandEnvironment> const & xCmdEnv );
+
+    /* The parameter isURL is false in the case of adding the conf:ini-entry
+       value from the backend db. This entry already contains the path as it
+       is used in the configmgr.ini.
+     */
+    void addToConfigmgrIni( bool isSchema, bool isURL, OUString const & url,
+                     Reference<XCommandEnvironment> const & xCmdEnv );
+#if HAVE_FEATURE_EXTENSIONS
+    bool removeFromConfigmgrIni( bool isSchema, OUString const & url,
+                          Reference<XCommandEnvironment> const & xCmdEnv );
+#endif
+    void addDataToDb(OUString const & url, ConfigurationBackendDb::Data const & data);
+    ::std::optional<ConfigurationBackendDb::Data> readDataFromDb(std::u16string_view url);
+    void revokeEntryFromDb(std::u16string_view url);
+    bool hasActiveEntry(std::u16string_view url);
+    bool activateEntry(std::u16string_view url);
+
+public:
+    BackendImpl( Sequence<Any> const & args,
+                 Reference<XComponentContext> const & xComponentContext );
+
+    // XServiceInfo
+    virtual OUString SAL_CALL getImplementationName() override;
+    virtual sal_Bool SAL_CALL supportsService( const OUString& ServiceName ) override;
+    virtual css::uno::Sequence< OUString > SAL_CALL getSupportedServiceNames() override;
+
+    // XPackageRegistry
+    virtual Sequence< Reference<deployment::XPackageTypeInfo> > SAL_CALL
+    getSupportedPackageTypes() override;
+    virtual void SAL_CALL packageRemoved(OUString const & url, OUString const & mediaType) override;
+
+    using PackageRegistryBackend::disposing;
+};
+
+
+void BackendImpl::disposing()
+{
+    try {
+        configmgrini_flush( Reference<XCommandEnvironment>() );
+
+        PackageRegistryBackend::disposing();
+    }
+    catch (const RuntimeException &) {
+        throw;
+    }
+    catch (const Exception &) {
+        Any exc( ::cppu::getCaughtException() );
+        throw lang::WrappedTargetRuntimeException(
+            "caught unexpected exception while disposing...",
+            static_cast<OWeakObject *>(this), exc );
+    }
+}
+
+
+BackendImpl::BackendImpl(
+    Sequence<Any> const & args,
+    Reference<XComponentContext> const & xComponentContext )
+    : PackageRegistryBackend( args, xComponentContext ),
+      m_configmgrini_inited( false ),
+      m_configmgrini_modified( false ),
+      m_xConfDataTypeInfo( new Package::TypeInfo(
+                               "application/vnd.sun.star.configuration-data",
+                               "*.xcu",
+                               DpResId(RID_STR_CONF_DATA)
+                               ) ),
+      m_xConfSchemaTypeInfo( new Package::TypeInfo(
+                                 "application/vnd.sun.star.configuration-schema",
+                                 "*.xcs",
+                                 DpResId(RID_STR_CONF_SCHEMA)
+                                 ) ),
+      m_typeInfos{ m_xConfDataTypeInfo, m_xConfSchemaTypeInfo }
+{
+    const Reference<XCommandEnvironment> xCmdEnv;
+
+    if (transientMode())
+    {
+        // TODO
+    }
+    else
+    {
+        OUString dbFile = makeURL(getCachePath(), "backenddb.xml");
+        m_backendDb.reset(
+            new ConfigurationBackendDb(getComponentContext(), dbFile));
+        //clean up data folders which are no longer used.
+        //This must not be done in the same process where the help files
+        //are still registers. Only after revoking and restarting OOo the folders
+        //can be removed. This works now, because the extension manager is a singleton
+        //and the backends are only create once per process.
+        std::vector<OUString> folders = m_backendDb->getAllDataUrls();
+        deleteUnusedFolders(folders);
+
+        configmgrini_verify_init( xCmdEnv );
+
+#if HAVE_FEATURE_EXTENSIONS
+        std::unique_ptr<PersistentMap> pMap;
+        OUString aCompatURL( makeURL( getCachePath(), "registered_packages.pmap" ) );
+
+        // Don't create it if it doesn't exist already
+        if ( ::utl::UCBContentHelper::Exists( expandUnoRcUrl( aCompatURL ) ) )
+        {
+            try
+            {
+                pMap.reset( new PersistentMap( aCompatURL ) );
+            }
+            catch (const Exception &e)
+            {
+                OUString aStr = "Exception loading legacy package database: '" +
+                    e.Message +
+                    "' - ignoring file, please remove it.\n";
+                dp_misc::writeConsole( aStr );
+            }
+        }
+        m_registeredPackages = std::move(pMap);
+#endif
+     }
+}
+
+// XServiceInfo
+OUString BackendImpl::getImplementationName()
+{
+    return "com.sun.star.comp.deployment.configuration.PackageRegistryBackend";
+}
+
+sal_Bool BackendImpl::supportsService( const OUString& ServiceName )
+{
+    return cppu::supportsService(this, ServiceName);
+}
+
+css::uno::Sequence< OUString > BackendImpl::getSupportedServiceNames()
+{
+    return { BACKEND_SERVICE_NAME };
+}
+
+void BackendImpl::addDataToDb(
+    OUString const & url, ConfigurationBackendDb::Data const & data)
+{
+    if (m_backendDb)
+        m_backendDb->addEntry(url, data);
+}
+
+::std::optional<ConfigurationBackendDb::Data> BackendImpl::readDataFromDb(
+    std::u16string_view url)
+{
+    ::std::optional<ConfigurationBackendDb::Data> data;
+    if (m_backendDb)
+        data = m_backendDb->getEntry(url);
+    return data;
+}
+
+void BackendImpl::revokeEntryFromDb(std::u16string_view url)
+{
+    if (m_backendDb)
+        m_backendDb->revokeEntry(url);
+}
+
+bool BackendImpl::hasActiveEntry(std::u16string_view url)
+{
+    if (m_backendDb)
+        return m_backendDb->hasActiveEntry(url);
+    return false;
+}
+
+bool BackendImpl::activateEntry(std::u16string_view url)
+{
+    if (m_backendDb)
+        return m_backendDb->activateEntry(url);
+    return false;
+}
+
+
+// XPackageRegistry
+
+Sequence< Reference<deployment::XPackageTypeInfo> >
+BackendImpl::getSupportedPackageTypes()
+{
+    return m_typeInfos;
+}
+void BackendImpl::packageRemoved(OUString const & url, OUString const & /*mediaType*/)
+{
+    if (m_backendDb)
+        m_backendDb->removeEntry(url);
+}
+
+// PackageRegistryBackend
+
+Reference<deployment::XPackage> BackendImpl::bindPackage_(
+    OUString const & url, OUString const & mediaType_,
+    bool bRemoved, OUString const & identifier,
+    Reference<XCommandEnvironment> const & xCmdEnv )
+{
+    OUString mediaType( mediaType_ );
+    if (mediaType.isEmpty())
+    {
+        // detect media-type:
+        ::ucbhelper::Content ucbContent;
+        if (create_ucb_content( &ucbContent, url, xCmdEnv ))
+        {
+            const OUString title( StrTitle::getTitle( ucbContent ) );
+            if (title.endsWithIgnoreAsciiCase( ".xcu" )) {
+                mediaType = "application/vnd.sun.star.configuration-data";
+            }
+            if (title.endsWithIgnoreAsciiCase( ".xcs" )) {
+                mediaType = "application/vnd.sun.star.configuration-schema";
+            }
+        }
+        if (mediaType.isEmpty())
+            throw lang::IllegalArgumentException(
+                StrCannotDetectMediaType() + url,
+                static_cast<OWeakObject *>(this), static_cast<sal_Int16>(-1) );
+    }
+
+    OUString type, subType;
+    INetContentTypeParameterList params;
+    if (INetContentTypes::parse( mediaType, type, subType, &params ))
+    {
+        if (type.equalsIgnoreAsciiCase("application"))
+        {
+            OUString name;
+            if (!bRemoved)
+            {
+                ::ucbhelper::Content ucbContent( url, xCmdEnv, m_xComponentContext );
+                name = StrTitle::getTitle( ucbContent );
+            }
+
+            if (subType.equalsIgnoreAsciiCase( "vnd.sun.star.configuration-data"))
+            {
+                return new PackageImpl(
+                    this, url, name, m_xConfDataTypeInfo, false /* data file */,
+                    bRemoved, identifier);
+            }
+            else if (subType.equalsIgnoreAsciiCase( "vnd.sun.star.configuration-schema")) {
+                return new PackageImpl(
+                    this, url, name, m_xConfSchemaTypeInfo, true /* schema file */,
+                    bRemoved, identifier);
+            }
+        }
+    }
+    throw lang::IllegalArgumentException(
+        StrUnsupportedMediaType() + mediaType,
+        static_cast<OWeakObject *>(this),
+        static_cast<sal_Int16>(-1) );
+}
+
+
+void BackendImpl::configmgrini_verify_init(
+    Reference<XCommandEnvironment> const & xCmdEnv )
+{
+    if (transientMode())
+        return;
+    const ::osl::MutexGuard guard( m_aMutex );
+    if ( m_configmgrini_inited)
+        return;
+
+    // common rc:
+    ::ucbhelper::Content ucb_content;
+    if (create_ucb_content(
+            &ucb_content,
+            makeURL( getCachePath(), "configmgr.ini" ),
+            xCmdEnv, false /* no throw */ ))
+    {
+        OUString line;
+        if (readLine( &line, "SCHEMA=", ucb_content,
+                      RTL_TEXTENCODING_UTF8 ))
+        {
+            sal_Int32 index = RTL_CONSTASCII_LENGTH("SCHEMA=");
+            do {
+                OUString token( o3tl::trim(o3tl::getToken(line, 0, ' ', index )) );
+                if (!token.isEmpty()) {
+                    //The  file may not exist anymore if a shared or bundled
+                    //extension was removed, but it can still be in the configmgrini.
+                    //After running XExtensionManager::synchronize, the configmgrini is
+                    //cleaned up
+                    m_xcs_files.push_back( token );
+                }
+            }
+            while (index >= 0);
+        }
+        if (readLine( &line, "DATA=", ucb_content,
+                      RTL_TEXTENCODING_UTF8 )) {
+            sal_Int32 index = RTL_CONSTASCII_LENGTH("DATA=");
+            do {
+                std::u16string_view token( o3tl::trim(o3tl::getToken(line, 0, ' ', index )) );
+                if (!token.empty())
+                {
+                    if (token[ 0 ] == '?')
+                        token = token.substr( 1 );
+                    //The  file may not exist anymore if a shared or bundled
+                    //extension was removed, but it can still be in the configmgrini.
+                    //After running XExtensionManager::synchronize, the configmgrini is
+                    //cleaned up
+                    m_xcu_files.push_back( OUString(token) );
+                }
+            }
+            while (index >= 0);
+        }
+    }
+    m_configmgrini_modified = false;
+    m_configmgrini_inited = true;
+}
+
+
+void BackendImpl::configmgrini_flush(
+    Reference<XCommandEnvironment> const & xCmdEnv )
+{
+    if (transientMode())
+        return;
+    if (!m_configmgrini_inited || !m_configmgrini_modified)
+        return;
+
+    OStringBuffer buf;
+    if (! m_xcs_files.empty())
+    {
+        auto iPos( m_xcs_files.cbegin() );
+        auto const iEnd( m_xcs_files.cend() );
+        buf.append( "SCHEMA=" );
+        while (iPos != iEnd) {
+            // encoded ASCII file-urls:
+            const OString item(
+                OUStringToOString( *iPos, RTL_TEXTENCODING_ASCII_US ) );
+            buf.append( item );
+            ++iPos;
+            if (iPos != iEnd)
+                buf.append( ' ' );
+        }
+        buf.append(LF);
+    }
+    if (! m_xcu_files.empty())
+    {
+        auto iPos( m_xcu_files.cbegin() );
+        auto const iEnd( m_xcu_files.cend() );
+        buf.append( "DATA=" );
+        while (iPos != iEnd) {
+            // encoded ASCII file-urls:
+            const OString item(
+                OUStringToOString( *iPos, RTL_TEXTENCODING_ASCII_US ) );
+            buf.append( item );
+            ++iPos;
+            if (iPos != iEnd)
+                buf.append( ' ' );
+        }
+        buf.append(LF);
+    }
+
+    // write configmgr.ini:
+    const Reference<io::XInputStream> xData(
+        ::xmlscript::createInputStream(
+                reinterpret_cast<sal_Int8 const *>(buf.getStr()),
+                buf.getLength() ) );
+    ::ucbhelper::Content ucb_content(
+        makeURL( getCachePath(), "configmgr.ini" ), xCmdEnv, m_xComponentContext );
+    ucb_content.writeStream( xData, true /* replace existing */ );
+
+    m_configmgrini_modified = false;
+}
+
+
+void BackendImpl::addToConfigmgrIni( bool isSchema, bool isURL, OUString const & url_,
+                              Reference<XCommandEnvironment> const & xCmdEnv )
+{
+    const OUString rcterm( isURL ? dp_misc::makeRcTerm(url_) : url_ );
+    const ::osl::MutexGuard guard( m_aMutex );
+    configmgrini_verify_init( xCmdEnv );
+    std::deque<OUString> & rSet = getFiles(isSchema);
+    if (std::find( rSet.begin(), rSet.end(), rcterm ) == rSet.end()) {
+        rSet.push_front( rcterm ); // prepend to list, thus overriding
+        // write immediately:
+        m_configmgrini_modified = true;
+        configmgrini_flush( xCmdEnv );
+    }
+}
+
+#if HAVE_FEATURE_EXTENSIONS
+bool BackendImpl::removeFromConfigmgrIni(
+    bool isSchema, OUString const & url_,
+    Reference<XCommandEnvironment> const & xCmdEnv )
+{
+    const OUString rcterm( dp_misc::makeRcTerm(url_) );
+    const ::osl::MutexGuard guard( m_aMutex );
+    configmgrini_verify_init( xCmdEnv );
+    std::deque<OUString> & rSet = getFiles(isSchema);
+    auto i(std::find(rSet.begin(), rSet.end(), rcterm));
+    if (i == rSet.end() && !isSchema)
+    {
+        //in case the xcu contained %origin% then the configmr.ini contains the
+        //url to the file in the user installation (e.g. $BUNDLED_EXTENSIONS_USER)
+        //However, m_url (getURL()) contains the URL for the file in the actual
+        //extension installation.
+        ::std::optional<ConfigurationBackendDb::Data> data = readDataFromDb(url_);
+        if (data)
+            i = std::find(rSet.begin(), rSet.end(), data->iniEntry);
+    }
+    if (i == rSet.end()) {
+        return false;
+    }
+    rSet.erase(i);
+    // write immediately:
+    m_configmgrini_modified = true;
+    configmgrini_flush( xCmdEnv );
+    return true;
+}
+#endif
+
+// Package
+
+
+BackendImpl * BackendImpl::PackageImpl::getMyBackend() const
+{
+    BackendImpl * pBackend = static_cast<BackendImpl *>(m_myBackend.get());
+    if (nullptr == pBackend)
+    {
+        //May throw a DisposedException
+        check();
+        //We should never get here...
+        throw RuntimeException(
+            "Failed to get the BackendImpl",
+            static_cast<OWeakObject*>(const_cast<PackageImpl *>(this)));
+    }
+    return pBackend;
+}
+
+beans::Optional< beans::Ambiguous<sal_Bool> >
+BackendImpl::PackageImpl::isRegistered_(
+    ::osl::ResettableMutexGuard &,
+    ::rtl::Reference<AbortChannel> const &,
+    Reference<XCommandEnvironment> const & )
+{
+    BackendImpl * that = getMyBackend();
+
+    bool bReg = false;
+    if (that->hasActiveEntry(getURL()))
+        bReg = true;
+
+#if HAVE_FEATURE_EXTENSIONS
+    const OUString url(getURL());
+    if (!bReg && that->m_registeredPackages)
+    {
+        // fallback for user extension registered in berkeley DB
+        bReg = that->m_registeredPackages->has(
+            OUStringToOString( url, RTL_TEXTENCODING_UTF8 ));
+    }
+#endif
+    return beans::Optional< beans::Ambiguous<sal_Bool> >(
+        true, beans::Ambiguous<sal_Bool>( bReg, false ) );
+}
+
+
+OUString encodeForXml( OUString const & text )
+{
+    // encode conforming xml:
+    sal_Int32 len = text.getLength();
+    OUStringBuffer buf;
+    for ( sal_Int32 pos = 0; pos < len; ++pos )
+    {
+        sal_Unicode c = text[ pos ];
+        switch (c) {
+        case '<':
+            buf.append( "&lt;" );
+            break;
+        case '>':
+            buf.append( "&gt;" );
+            break;
+        case '&':
+            buf.append( "&amp;" );
+            break;
+        case '\'':
+            buf.append( "&apos;" );
+            break;
+        case '\"':
+            buf.append( "&quot;" );
+            break;
+        default:
+            buf.append( c );
+            break;
+        }
+    }
+    return buf.makeStringAndClear();
+}
+
+
+OUString replaceOrigin(
+    OUString const & url, std::u16string_view destFolder, Reference< XCommandEnvironment > const & xCmdEnv, Reference< XComponentContext > const & xContext, bool & out_replaced)
+{
+    // looking for %origin%:
+    ::ucbhelper::Content ucb_content( url, xCmdEnv, xContext );
+    std::vector<sal_Int8> bytes( readFile( ucb_content ) );
+    std::vector<sal_Int8> filtered( bytes.size() * 2 );
+    bool use_filtered = false;
+    OString origin;
+    char const * pBytes = reinterpret_cast<char const *>(
+        bytes.data());
+    std::size_t nBytes = bytes.size();
+    size_t write_pos = 0;
+    while (nBytes > 0)
+    {
+        sal_Int32 index = rtl_str_indexOfChar_WithLength( pBytes, nBytes, '%' );
+        if (index < 0) {
+            if (! use_filtered) // opt
+                break;
+            index = nBytes;
+        }
+
+        if ((write_pos + index) > filtered.size())
+            filtered.resize( (filtered.size() + index) * 2 );
+        memcpy( filtered.data() + write_pos, pBytes, index );
+        write_pos += index;
+        pBytes += index;
+        nBytes -= index;
+        if (nBytes == 0)
+            break;
+
+        // consume %:
+        ++pBytes;
+        --nBytes;
+        char const * pAdd = "%";
+        sal_Int32 nAdd = 1;
+        if (nBytes > 1 && pBytes[ 0 ] == '%')
+        {
+            // %% => %
+            ++pBytes;
+            --nBytes;
+            use_filtered = true;
+        }
+        else if (rtl_str_shortenedCompare_WithLength(
+                     pBytes, nBytes,
+                     "origin%",
+                     RTL_CONSTASCII_LENGTH("origin%"),
+                     RTL_CONSTASCII_LENGTH("origin%")) == 0)
+        {
+            if (origin.isEmpty()) {
+                // encode only once
+                origin = OUStringToOString(
+                    encodeForXml( url.copy( 0, url.lastIndexOf( '/' ) ) ),
+                    // xxx todo: encode always for UTF-8? => lookup doc-header?
+                    RTL_TEXTENCODING_UTF8 );
+            }
+            pAdd = origin.getStr();
+            nAdd = origin.getLength();
+            pBytes += RTL_CONSTASCII_LENGTH("origin%");
+            nBytes -= RTL_CONSTASCII_LENGTH("origin%");
+            use_filtered = true;
+        }
+        if ((write_pos + nAdd) > filtered.size())
+            filtered.resize( (filtered.size() + nAdd) * 2 );
+        memcpy( filtered.data() + write_pos, pAdd, nAdd );
+        write_pos += nAdd;
+    }
+    if (!use_filtered)
+        return url;
+    if (write_pos < filtered.size())
+        filtered.resize( write_pos );
+    OUString newUrl(url);
+    if (!destFolder.empty())
+    {
+        //get the file name of the xcu and add it to the url of the temporary folder
+        sal_Int32 i = url.lastIndexOf('/');
+        newUrl = OUString::Concat(destFolder) + url.subView(i);
+    }
+
+    ucbhelper::Content(newUrl, xCmdEnv, xContext).writeStream(
+        xmlscript::createInputStream(std::move(filtered)), true);
+    out_replaced = true;
+    return newUrl;
+}
+
+
+void BackendImpl::PackageImpl::processPackage_(
+    ::osl::ResettableMutexGuard &,
+    bool doRegisterPackage,
+    bool startup,
+    ::rtl::Reference<AbortChannel> const &,
+    Reference<XCommandEnvironment> const & xCmdEnv )
+{
+    BackendImpl * that = getMyBackend();
+    OUString url( getURL() );
+
+    if (doRegisterPackage)
+    {
+        if (getMyBackend()->activateEntry(getURL()))
+        {
+            ::std::optional<ConfigurationBackendDb::Data> data = that->readDataFromDb(url);
+            OSL_ASSERT(data);
+            that->addToConfigmgrIni( m_isSchema, false, data->iniEntry, xCmdEnv );
+        }
+        else
+        {
+            ConfigurationBackendDb::Data data;
+            if (!m_isSchema)
+            {
+                const OUString sModFolder = that->createFolder(xCmdEnv);
+                bool out_replaced = false;
+                url = replaceOrigin(url, sModFolder, xCmdEnv, that->getComponentContext(), out_replaced);
+                if (out_replaced)
+                    data.dataUrl = sModFolder;
+                else
+                    deleteTempFolder(sModFolder);
+            }
+            //No need for live-deployment for bundled extension, because OOo
+            //restarts after installation
+            if ((that->m_eContext != Context::Bundled && !startup)
+                 || comphelper::LibreOfficeKit::isActive())
+            {
+                if (m_isSchema)
+                {
+                    css::configuration::Update::get(
+                        that->m_xComponentContext)->insertExtensionXcsFile(
+                            that->m_eContext == Context::Shared, expandUnoRcUrl(url));
+                }
+                else
+                {
+                    css::configuration::Update::get(
+                        that->m_xComponentContext)->insertExtensionXcuFile(
+                            that->m_eContext == Context::Shared, expandUnoRcUrl(url));
+                }
+            }
+            that->addToConfigmgrIni( m_isSchema, true, url, xCmdEnv );
+            data.iniEntry = dp_misc::makeRcTerm(url);
+            that->addDataToDb(getURL(), data);
+        }
+    }
+    else // revoke
+    {
+#if HAVE_FEATURE_EXTENSIONS
+        if (!that->removeFromConfigmgrIni(m_isSchema, url, xCmdEnv) &&
+            that->m_registeredPackages) {
+            // Obsolete package database handling - should be removed for LibreOffice 4.0
+            t_string2string_map entries(
+                that->m_registeredPackages->getEntries());
+            for (auto const& entry : entries)
+            {
+                //If the xcu file was installed before the configmgr was changed
+                //to use the configmgr.ini, one needed to rebuild to whole directory
+                //structure containing the xcu, xcs files from all extensions. Now,
+                //we just add all other xcu/xcs files to the configmgr.ini instead of
+                //rebuilding the directory structure.
+                OUString url2(
+                    OStringToOUString(entry.first, RTL_TEXTENCODING_UTF8));
+                if (url2 != url) {
+                   bool schema = entry.second.equalsIgnoreAsciiCase(
+                       "vnd.sun.star.configuration-schema");
+                   OUString url_replaced(url2);
+                   ConfigurationBackendDb::Data data;
+                   if (!schema)
+                   {
+                       const OUString sModFolder = that->createFolder(xCmdEnv);
+                       bool out_replaced = false;
+                       url_replaced = replaceOrigin(
+                           url2, sModFolder, xCmdEnv, that->getComponentContext(), out_replaced);
+                       if (out_replaced)
+                           data.dataUrl = sModFolder;
+                       else
+                           deleteTempFolder(sModFolder);
+                   }
+                   that->addToConfigmgrIni(schema, true, url_replaced, xCmdEnv);
+                   data.iniEntry = dp_misc::makeRcTerm(url_replaced);
+                   that->addDataToDb(url2, data);
+                }
+                that->m_registeredPackages->erase(entry.first);
+            }
+            try
+            {
+                ::ucbhelper::Content(
+                    makeURL( that->getCachePath(), "registry" ),
+                    xCmdEnv, that->getComponentContext() ).executeCommand(
+                        "delete", Any( true /* delete physically */ ) );
+            }
+            catch(const Exception&)
+            {
+                OSL_ASSERT(false);
+            }
+        }
+#endif
+        ::std::optional<ConfigurationBackendDb::Data> data = that->readDataFromDb(url);
+        //If an xcu file was life deployed then always a data entry is written.
+        //If the xcu file was already in the configmr.ini then there is also
+        //a data entry
+        if (!m_isSchema && data)
+        {
+            css::configuration::Update::get(
+                that->m_xComponentContext)->removeExtensionXcuFile(expandUnoRcTerm(data->iniEntry));
+        }
+        that->revokeEntryFromDb(url);
+    }
+}
+
+} // anon namespace
+
+} // namespace dp_registry
+
+extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface*
+com_sun_star_comp_deployment_configuration_PackageRegistryBackend_get_implementation(
+    css::uno::XComponentContext* context, css::uno::Sequence<css::uno::Any> const& args)
+{
+    return cppu::acquire(new dp_registry::backend::configuration::BackendImpl(args, context));
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/desktop/source/deployment/registry/configuration/dp_configurationbackenddb.cxx b/desktop/source/deployment/registry/configuration/dp_configurationbackenddb.cxx
new file mode 100644
index 000000000..afdc8112f
--- /dev/null
+++ b/desktop/source/deployment/registry/configuration/dp_configurationbackenddb.cxx
@@ -0,0 +1,161 @@
+/* -*- 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 <cppuhelper/exc_hlp.hxx>
+#include <com/sun/star/deployment/DeploymentException.hpp>
+#include <com/sun/star/uno/XComponentContext.hpp>
+#include <com/sun/star/xml/xpath/XXPathAPI.hpp>
+
+#include "dp_configurationbackenddb.hxx"
+
+
+using namespace ::com::sun::star::uno;
+
+constexpr OUStringLiteral EXTENSION_REG_NS = u"http://openoffice.org/extensionmanager/configuration-registry/2010";
+constexpr OUStringLiteral NS_PREFIX = u"conf";
+constexpr OUStringLiteral ROOT_ELEMENT_NAME = u"configuration-backend-db";
+constexpr OUStringLiteral KEY_ELEMENT_NAME = u"configuration";
+
+namespace dp_registry::backend::configuration {
+
+ConfigurationBackendDb::ConfigurationBackendDb(
+    Reference<XComponentContext> const &  xContext,
+    OUString const & url):BackendDb(xContext, url)
+{
+
+}
+
+OUString ConfigurationBackendDb::getDbNSName()
+{
+    return EXTENSION_REG_NS;
+}
+
+OUString ConfigurationBackendDb::getNSPrefix()
+{
+    return NS_PREFIX;
+}
+
+OUString ConfigurationBackendDb::getRootElementName()
+{
+    return ROOT_ELEMENT_NAME;
+}
+
+OUString ConfigurationBackendDb::getKeyElementName()
+{
+    return KEY_ELEMENT_NAME;
+}
+
+
+void ConfigurationBackendDb::addEntry(OUString const & url, Data const & data)
+{
+    try{
+        if (!activateEntry(url))
+        {
+            Reference<css::xml::dom::XNode> helpNode
+                = writeKeyElement(url);
+
+            writeSimpleElement(u"data-url", data.dataUrl, helpNode);
+            writeSimpleElement(u"ini-entry", data.iniEntry, helpNode);
+            save();
+        }
+    }
+    catch ( const css::deployment::DeploymentException& )
+    {
+        throw;
+    }
+    catch(const css::uno::Exception &)
+    {
+        Any exc( ::cppu::getCaughtException() );
+        throw css::deployment::DeploymentException(
+            "Extension Manager: failed to write data entry in configuration backend db: " +
+            m_urlDb, nullptr, exc);
+    }
+}
+
+
+::std::optional<ConfigurationBackendDb::Data>
+ConfigurationBackendDb::getEntry(std::u16string_view url)
+{
+    try
+    {
+        ConfigurationBackendDb::Data retData;
+        Reference<css::xml::dom::XNode> aNode = getKeyElement(url);
+        if (aNode.is())
+        {
+            retData.dataUrl = readSimpleElement(u"data-url", aNode);
+            retData.iniEntry = readSimpleElement(u"ini-entry", aNode);
+        }
+        else
+        {
+            return ::std::optional<Data>();
+        }
+        return ::std::optional<Data>(retData);
+    }
+    catch ( const css::deployment::DeploymentException& )
+    {
+        throw;
+    }
+    catch(const css::uno::Exception &)
+    {
+        Any exc( ::cppu::getCaughtException() );
+        throw css::deployment::DeploymentException(
+            "Extension Manager: failed to read data entry in configuration backend db: " +
+            m_urlDb, nullptr, exc);
+    }
+}
+
+std::vector<OUString> ConfigurationBackendDb::getAllDataUrls()
+{
+    try
+    {
+        std::vector<OUString> listRet;
+        Reference<css::xml::dom::XDocument> doc = getDocument();
+        Reference<css::xml::dom::XNode> root = doc->getFirstChild();
+
+        Reference<css::xml::xpath::XXPathAPI> xpathApi = getXPathAPI();
+        const OUString sPrefix = getNSPrefix();
+        OUString sExpression(
+            sPrefix + ":configuration/" + sPrefix + ":data-url/text()");
+        Reference<css::xml::dom::XNodeList> nodes =
+            xpathApi->selectNodeList(root, sExpression);
+        if (nodes.is())
+        {
+            sal_Int32 length = nodes->getLength();
+            for (sal_Int32 i = 0; i < length; i++)
+                listRet.push_back(nodes->item(i)->getNodeValue());
+        }
+        return listRet;
+    }
+    catch ( const css::deployment::DeploymentException& )
+    {
+        throw;
+    }
+    catch(const css::uno::Exception &)
+    {
+        Any exc( ::cppu::getCaughtException() );
+        throw css::deployment::DeploymentException(
+            "Extension Manager: failed to read data entry in configuration backend db: " +
+            m_urlDb, nullptr, exc);
+    }
+}
+
+} // namespace dp_registry::backend::configuration
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/desktop/source/deployment/registry/configuration/dp_configurationbackenddb.hxx b/desktop/source/deployment/registry/configuration/dp_configurationbackenddb.hxx
new file mode 100644
index 000000000..bd48aab7b
--- /dev/null
+++ b/desktop/source/deployment/registry/configuration/dp_configurationbackenddb.hxx
@@ -0,0 +1,74 @@
+/* -*- 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 .
+ */
+
+#pragma once
+
+#include <rtl/ustring.hxx>
+#include <rtl/string.hxx>
+#include <vector>
+#include <optional>
+#include <string_view>
+
+#include <dp_backenddb.hxx>
+
+namespace com::sun::star::uno
+{
+class XComponentContext;
+}
+
+namespace dp_registry::backend::configuration
+{
+/* The XML file stores the extensions which are currently registered.
+   They will be removed when they are revoked.
+ */
+class ConfigurationBackendDb : public dp_registry::backend::BackendDb
+{
+protected:
+    virtual OUString getDbNSName() override;
+
+    virtual OUString getNSPrefix() override;
+
+    virtual OUString getRootElementName() override;
+
+    virtual OUString getKeyElementName() override;
+
+public:
+    struct Data
+    {
+        /* the URL to the folder containing the xcu or xcs files which contained
+           %origin%
+         */
+        OUString dataUrl;
+        /* the URL of the xcu or xcs file which is written in to the configmgr.ini
+         */
+        OUString iniEntry;
+    };
+
+public:
+    ConfigurationBackendDb(css::uno::Reference<css::uno::XComponentContext> const& xContext,
+                           OUString const& url);
+
+    void addEntry(OUString const& url, Data const& data);
+
+    ::std::optional<Data> getEntry(std::u16string_view url);
+    std::vector<OUString> getAllDataUrls();
+};
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/desktop/source/deployment/registry/dp_backend.cxx b/desktop/source/deployment/registry/dp_backend.cxx
new file mode 100644
index 000000000..2a681fe87
--- /dev/null
+++ b/desktop/source/deployment/registry/dp_backend.cxx
@@ -0,0 +1,771 @@
+/* -*- 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 <sal/config.h>
+
+#include <cassert>
+
+#include <dp_backend.h>
+#include <dp_misc.h>
+#include <dp_ucb.h>
+#include <rtl/ustring.hxx>
+#include <rtl/bootstrap.hxx>
+#include <sal/log.hxx>
+#include <cppuhelper/exc_hlp.hxx>
+#include <comphelper/unwrapargs.hxx>
+#include <ucbhelper/content.hxx>
+#include <com/sun/star/lang/WrappedTargetRuntimeException.hpp>
+#include <com/sun/star/deployment/DeploymentException.hpp>
+#include <com/sun/star/deployment/ExtensionRemovedException.hpp>
+#include <com/sun/star/deployment/InvalidRemovedParameterException.hpp>
+#include <com/sun/star/ucb/ContentCreationException.hpp>
+#include <com/sun/star/ucb/CommandAbortedException.hpp>
+#include <com/sun/star/ucb/CommandFailedException.hpp>
+#include <com/sun/star/ucb/InteractiveAugmentedIOException.hpp>
+#include <com/sun/star/ucb/IOErrorCode.hpp>
+#include <com/sun/star/beans/StringPair.hpp>
+#include <com/sun/star/sdbc/XResultSet.hpp>
+#include <com/sun/star/sdbc/XRow.hpp>
+#include <tools/diagnose_ex.h>
+#include <unotools/tempfile.hxx>
+#include <optional>
+#include <utility>
+
+using namespace ::dp_misc;
+using namespace ::com::sun::star;
+using namespace ::com::sun::star::uno;
+using namespace ::com::sun::star::ucb;
+
+namespace dp_registry::backend {
+
+
+PackageRegistryBackend::~PackageRegistryBackend()
+{
+}
+
+
+void PackageRegistryBackend::disposing( lang::EventObject const & event )
+{
+    Reference<deployment::XPackage> xPackage(
+        event.Source, UNO_QUERY_THROW );
+    OUString url( xPackage->getURL() );
+    ::osl::MutexGuard guard( m_aMutex );
+    if ( m_bound.erase( url ) != 1 )
+    {
+        SAL_WARN("desktop.deployment", "erase(" << url << ") != 1");
+    }
+}
+
+
+PackageRegistryBackend::PackageRegistryBackend(
+    Sequence<Any> const & args,
+    Reference<XComponentContext> const & xContext )
+    : t_BackendBase( m_aMutex ),
+      m_xComponentContext( xContext ),
+      m_eContext( Context::Unknown )
+{
+    assert(xContext.is());
+    std::optional<OUString> cachePath;
+    std::optional<bool> readOnly;
+    comphelper::unwrapArgs( args, m_context, cachePath, readOnly );
+    if (cachePath)
+        m_cachePath = *cachePath;
+
+    if ( m_context == "user" )
+        m_eContext = Context::User;
+    else if ( m_context == "shared" )
+        m_eContext = Context::Shared;
+    else if ( m_context == "bundled" )
+        m_eContext = Context::Bundled;
+    else if ( m_context == "tmp" )
+        m_eContext = Context::Tmp;
+    else if (m_context.matchIgnoreAsciiCase("vnd.sun.star.tdoc:/"))
+        m_eContext = Context::Document;
+    else
+        m_eContext = Context::Unknown;
+}
+
+
+void PackageRegistryBackend::check()
+{
+    ::osl::MutexGuard guard( m_aMutex );
+    if (rBHelper.bInDispose || rBHelper.bDisposed) {
+        throw lang::DisposedException(
+            "PackageRegistryBackend instance has already been disposed!",
+            static_cast<OWeakObject *>(this) );
+    }
+}
+
+
+void PackageRegistryBackend::disposing()
+{
+    try {
+        for (auto const& elem : m_bound)
+            elem.second->removeEventListener(this);
+        m_bound.clear();
+        m_xComponentContext.clear();
+        WeakComponentImplHelperBase::disposing();
+    }
+    catch (const RuntimeException &) {
+        throw;
+    }
+    catch (const Exception &) {
+        Any exc( ::cppu::getCaughtException() );
+        throw lang::WrappedTargetRuntimeException(
+            "caught unexpected exception while disposing!",
+            static_cast<OWeakObject *>(this), exc );
+    }
+}
+
+// XPackageRegistry
+
+Reference<deployment::XPackage> PackageRegistryBackend::bindPackage(
+    OUString const & url, OUString const & mediaType, sal_Bool  bRemoved,
+    OUString const & identifier, Reference<XCommandEnvironment> const & xCmdEnv )
+{
+    ::osl::ResettableMutexGuard guard( m_aMutex );
+    check();
+
+    t_string2ref::const_iterator const iFind( m_bound.find( url ) );
+    if (iFind != m_bound.end())
+    {
+        Reference<deployment::XPackage> xPackage( iFind->second );
+        if (xPackage.is())
+        {
+            if (!mediaType.isEmpty() &&
+                mediaType != xPackage->getPackageType()->getMediaType())
+                throw lang::IllegalArgumentException
+                    ("XPackageRegistry::bindPackage: media type does not match",
+                     static_cast<OWeakObject*>(this), 1);
+            if (xPackage->isRemoved() != bRemoved)
+                throw deployment::InvalidRemovedParameterException(
+                    "XPackageRegistry::bindPackage: bRemoved parameter does not match",
+                    static_cast<OWeakObject*>(this), xPackage->isRemoved(), xPackage);
+            return xPackage;
+        }
+    }
+
+    guard.clear();
+
+    Reference<deployment::XPackage> xNewPackage;
+    try {
+        xNewPackage = bindPackage_( url, mediaType, bRemoved,
+            identifier, xCmdEnv );
+    }
+    catch (const RuntimeException &) {
+        throw;
+    }
+    catch (const CommandFailedException &) {
+        throw;
+    }
+    catch (const deployment::DeploymentException &) {
+        throw;
+    }
+    catch (const Exception &) {
+        Any exc( ::cppu::getCaughtException() );
+        throw deployment::DeploymentException(
+            "Error binding package: " + url,
+            static_cast<OWeakObject *>(this), exc );
+    }
+
+    guard.reset();
+
+    std::pair< t_string2ref::iterator, bool > insertion(
+        m_bound.emplace(  url, xNewPackage ) );
+    if (insertion.second)
+    { // first insertion
+        SAL_WARN_IF(
+            Reference<XInterface>(insertion.first->second) != xNewPackage,
+            "desktop.deployment", "mismatch");
+    }
+    else
+    { // found existing entry
+        Reference<deployment::XPackage> xPackage( insertion.first->second );
+        if (xPackage.is())
+            return xPackage;
+        insertion.first->second = xNewPackage;
+    }
+
+    guard.clear();
+    xNewPackage->addEventListener( this ); // listen for disposing events
+    return xNewPackage;
+}
+
+OUString PackageRegistryBackend::createFolder(
+    Reference<ucb::XCommandEnvironment> const & xCmdEnv)
+{
+    const OUString sDataFolder = makeURL(getCachePath(), OUString());
+    //make sure the folder exist
+    ucbhelper::Content dataContent;
+    ::dp_misc::create_folder(&dataContent, sDataFolder, xCmdEnv);
+
+    const OUString baseDir(sDataFolder);
+    ::utl::TempFile aTemp(&baseDir, true);
+    const OUString& url = aTemp.GetURL();
+    return sDataFolder + url.subView(url.lastIndexOf('/'));
+}
+
+//folderURL can have the extension .tmp or .tmp_
+//Before OOo 3.4 the created a tmp file with osl_createTempFile and
+//then created a Folder with a same name and a trailing '_'
+//If the folderURL has no '_' then there is no corresponding tmp file.
+void PackageRegistryBackend::deleteTempFolder(
+    OUString const & folderUrl)
+{
+    if (!folderUrl.isEmpty())
+    {
+        erase_path( folderUrl, Reference<XCommandEnvironment>(),
+                    false /* no throw: ignore errors */ );
+
+        if (folderUrl.endsWith("_"))
+        {
+            const OUString  tempFile = folderUrl.copy(0, folderUrl.getLength() - 1);
+            erase_path( tempFile, Reference<XCommandEnvironment>(),
+                        false /* no throw: ignore errors */ );
+        }
+    }
+}
+
+//usedFolders can contain folder names which have the extension .tmp or .tmp_
+//Before OOo 3.4 we created a tmp file with osl_createTempFile and
+//then created a Folder with a same name and a trailing '_'
+//If the folderURL has no '_' then there is no corresponding tmp file.
+void PackageRegistryBackend::deleteUnusedFolders(
+    std::vector< OUString> const & usedFolders)
+{
+    try
+    {
+        const OUString sDataFolder = makeURL(getCachePath(), OUString());
+        ::ucbhelper::Content tempFolder(
+            sDataFolder, Reference<ucb::XCommandEnvironment>(), m_xComponentContext);
+
+        Reference<sdbc::XResultSet> xResultSet(
+                 StrTitle::createCursor( tempFolder, ::ucbhelper::INCLUDE_FOLDERS_ONLY ) );
+
+        // get all temp directories:
+        std::vector<OUString> tempEntries;
+
+        while (xResultSet->next())
+        {
+            OUString title(
+                Reference<sdbc::XRow>(
+                    xResultSet, UNO_QUERY_THROW )->getString(
+                        1 /* Title */ ) );
+
+            if (title.endsWith(".tmp"))
+                tempEntries.push_back(
+                    makeURLAppendSysPathSegment(sDataFolder, title));
+        }
+
+        for (const OUString & tempEntrie : tempEntries)
+        {
+            if (std::find( usedFolders.begin(), usedFolders.end(), tempEntrie ) ==
+                usedFolders.end())
+            {
+                deleteTempFolder(tempEntrie);
+            }
+        }
+    }
+    catch (const ucb::InteractiveAugmentedIOException& e)
+    {
+        //In case the folder containing all the data folder does not
+        //exist yet, we ignore the exception
+        if (e.Code != ucb::IOErrorCode_NOT_EXISTING)
+            throw;
+    }
+
+}
+
+
+Package::~Package()
+{
+}
+
+
+Package::Package( ::rtl::Reference<PackageRegistryBackend>  myBackend,
+                  OUString url,
+                  OUString aName,
+                  OUString displayName,
+                  Reference<deployment::XPackageTypeInfo> const & xPackageType,
+                  bool bRemoved,
+                  OUString identifier)
+    : t_PackageBase( m_aMutex ),
+      m_myBackend(std::move( myBackend )),
+      m_url(std::move( url )),
+      m_name(std::move( aName )),
+      m_displayName(std::move( displayName )),
+      m_xPackageType( xPackageType ),
+      m_bRemoved(bRemoved),
+      m_identifier(std::move(identifier))
+{
+    if (m_bRemoved)
+    {
+        //We use the last segment of the URL
+        SAL_WARN_IF(
+            !m_name.isEmpty(), "desktop.deployment", "non-empty m_name");
+        OUString name = m_url;
+        rtl::Bootstrap::expandMacros(name);
+        sal_Int32 index = name.lastIndexOf('/');
+        if (index != -1 && index < name.getLength())
+            m_name = name.copy(index + 1);
+    }
+}
+
+
+void Package::disposing()
+{
+    m_myBackend.clear();
+    WeakComponentImplHelperBase::disposing();
+}
+
+
+void Package::check() const
+{
+    ::osl::MutexGuard guard( m_aMutex );
+    if (rBHelper.bInDispose || rBHelper.bDisposed) {
+        throw lang::DisposedException(
+            "Package instance has already been disposed!",
+            static_cast<OWeakObject *>(const_cast<Package *>(this)));
+    }
+}
+
+// XComponent
+
+void Package::dispose()
+{
+    //Do not call check here. We must not throw an exception here if the object
+    //is being disposed or is already disposed. See com.sun.star.lang.XComponent
+    WeakComponentImplHelperBase::dispose();
+}
+
+
+void Package::addEventListener(
+    Reference<lang::XEventListener> const & xListener )
+{
+    //Do not call check here. We must not throw an exception here if the object
+    //is being disposed or is already disposed. See com.sun.star.lang.XComponent
+    WeakComponentImplHelperBase::addEventListener( xListener );
+}
+
+
+void Package::removeEventListener(
+    Reference<lang::XEventListener> const & xListener )
+{
+    //Do not call check here. We must not throw an exception here if the object
+    //is being disposed or is already disposed. See com.sun.star.lang.XComponent
+    WeakComponentImplHelperBase::removeEventListener( xListener );
+}
+
+// XModifyBroadcaster
+
+void Package::addModifyListener(
+    Reference<util::XModifyListener> const & xListener )
+{
+    check();
+    rBHelper.addListener( cppu::UnoType<decltype(xListener)>::get(), xListener );
+}
+
+
+void Package::removeModifyListener(
+    Reference<util::XModifyListener> const & xListener )
+{
+    check();
+    rBHelper.removeListener( cppu::UnoType<decltype(xListener)>::get(), xListener );
+}
+
+
+void Package::checkAborted(
+    ::rtl::Reference<AbortChannel> const & abortChannel )
+{
+    if (abortChannel.is() && abortChannel->isAborted()) {
+        throw CommandAbortedException(
+            "abort!", static_cast<OWeakObject *>(this) );
+    }
+}
+
+// XPackage
+
+Reference<task::XAbortChannel> Package::createAbortChannel()
+{
+    check();
+    return new AbortChannel;
+}
+
+
+sal_Bool Package::isBundle()
+{
+    return false; // default
+}
+
+
+::sal_Int32 Package::checkPrerequisites(
+        const css::uno::Reference< css::task::XAbortChannel >&,
+        const css::uno::Reference< css::ucb::XCommandEnvironment >&,
+        sal_Bool)
+{
+    if (m_bRemoved)
+        throw deployment::ExtensionRemovedException();
+    return 0;
+}
+
+
+sal_Bool Package::checkDependencies(
+        const css::uno::Reference< css::ucb::XCommandEnvironment >& )
+{
+    if (m_bRemoved)
+        throw deployment::ExtensionRemovedException();
+    return true;
+}
+
+
+Sequence< Reference<deployment::XPackage> > Package::getBundle(
+    Reference<task::XAbortChannel> const &,
+    Reference<XCommandEnvironment> const & )
+{
+    return Sequence< Reference<deployment::XPackage> >();
+}
+
+
+OUString Package::getName()
+{
+    return m_name;
+}
+
+beans::Optional<OUString> Package::getIdentifier()
+{
+    if (m_bRemoved)
+        return beans::Optional<OUString>(true, m_identifier);
+
+    return beans::Optional<OUString>();
+}
+
+
+OUString Package::getVersion()
+{
+    if (m_bRemoved)
+        throw deployment::ExtensionRemovedException();
+    return OUString();
+}
+
+
+OUString Package::getURL()
+{
+    return m_url;
+}
+
+
+OUString Package::getDisplayName()
+{
+    if (m_bRemoved)
+        throw deployment::ExtensionRemovedException();
+    return m_displayName;
+}
+
+
+OUString Package::getDescription()
+{
+    if (m_bRemoved)
+        throw deployment::ExtensionRemovedException();
+    return OUString();
+}
+
+
+OUString Package::getLicenseText()
+{
+    if (m_bRemoved)
+        throw deployment::ExtensionRemovedException();
+    return OUString();
+}
+
+
+Sequence<OUString> Package::getUpdateInformationURLs()
+{
+    if (m_bRemoved)
+        throw deployment::ExtensionRemovedException();
+    return Sequence<OUString>();
+}
+
+
+css::beans::StringPair Package::getPublisherInfo()
+{
+    if (m_bRemoved)
+        throw deployment::ExtensionRemovedException();
+    css::beans::StringPair aEmptyPair;
+    return aEmptyPair;
+}
+
+
+uno::Reference< css::graphic::XGraphic > Package::getIcon( sal_Bool /*bHighContrast*/ )
+{
+    if (m_bRemoved)
+        throw deployment::ExtensionRemovedException();
+
+    uno::Reference< css::graphic::XGraphic > aEmpty;
+    return aEmpty;
+}
+
+
+Reference<deployment::XPackageTypeInfo> Package::getPackageType()
+{
+    return m_xPackageType;
+}
+
+void Package::exportTo(
+    OUString const & destFolderURL, OUString const & newTitle,
+    sal_Int32 nameClashAction, Reference<XCommandEnvironment> const & xCmdEnv )
+{
+    if (m_bRemoved)
+        throw deployment::ExtensionRemovedException();
+
+    ::ucbhelper::Content destFolder( destFolderURL, xCmdEnv, getMyBackend()->getComponentContext() );
+    ::ucbhelper::Content sourceContent( getURL(), xCmdEnv, getMyBackend()->getComponentContext() );
+    bool bOk=true;
+    try
+    {
+        destFolder.transferContent(
+            sourceContent, ::ucbhelper::InsertOperation::Copy,
+            newTitle, nameClashAction);
+    }
+    catch (const css::ucb::ContentCreationException&)
+    {
+        bOk = false;
+    }
+
+    if (!bOk)
+        throw RuntimeException( "UCB transferContent() failed!", nullptr );
+}
+
+void Package::fireModified()
+{
+    ::cppu::OInterfaceContainerHelper * container = rBHelper.getContainer(
+        cppu::UnoType<util::XModifyListener>::get() );
+    if (container == nullptr)
+        return;
+
+    const Sequence< Reference<XInterface> > elements(
+        container->getElements() );
+    lang::EventObject evt( static_cast<OWeakObject *>(this) );
+    for ( const Reference<XInterface>& x : elements )
+    {
+        Reference<util::XModifyListener> xListener( x, UNO_QUERY );
+        if (xListener.is())
+            xListener->modified( evt );
+    }
+}
+
+// XPackage
+
+beans::Optional< beans::Ambiguous<sal_Bool> > Package::isRegistered(
+    Reference<task::XAbortChannel> const & xAbortChannel,
+    Reference<XCommandEnvironment> const & xCmdEnv )
+{
+    try {
+        ::osl::ResettableMutexGuard guard( m_aMutex );
+        return isRegistered_( guard,
+                              AbortChannel::get(xAbortChannel),
+                              xCmdEnv );
+    }
+    catch (const RuntimeException &) {
+        throw;
+    }
+    catch (const CommandFailedException &) {
+        throw;
+    }
+    catch (const CommandAbortedException &) {
+        throw;
+    }
+    catch (const deployment::DeploymentException &) {
+        throw;
+    }
+    catch (const Exception & e) {
+        Any exc( ::cppu::getCaughtException() );
+        throw deployment::DeploymentException(
+            "unexpected " + exc.getValueTypeName() + ": " + e.Message,
+            static_cast<OWeakObject *>(this), exc );
+    }
+}
+
+
+void Package::processPackage_impl(
+    bool doRegisterPackage,
+    bool startup,
+    Reference<task::XAbortChannel> const & xAbortChannel,
+    Reference<XCommandEnvironment> const & xCmdEnv )
+{
+    check();
+    bool action = false;
+
+    try {
+        try {
+            ::osl::ResettableMutexGuard guard( m_aMutex );
+            beans::Optional< beans::Ambiguous<sal_Bool> > option(
+                isRegistered_( guard, AbortChannel::get(xAbortChannel),
+                               xCmdEnv ) );
+            action = (option.IsPresent &&
+                      (option.Value.IsAmbiguous ||
+                       (doRegisterPackage ? !option.Value.Value
+                                        : option.Value.Value)));
+            if (action) {
+
+                OUString displayName = isRemoved() ? getName() : getDisplayName();
+                ProgressLevel progress(
+                    xCmdEnv,
+                    (doRegisterPackage
+                     ? PackageRegistryBackend::StrRegisteringPackage()
+                     : PackageRegistryBackend::StrRevokingPackage())
+                    + displayName );
+                processPackage_( guard,
+                                 doRegisterPackage,
+                                 startup,
+                                 AbortChannel::get(xAbortChannel),
+                                 xCmdEnv );
+            }
+        }
+        catch (lang::IllegalArgumentException &) {
+            Any e(cppu::getCaughtException());
+            throw deployment::DeploymentException(
+                ((doRegisterPackage
+                  ? DpResId(RID_STR_ERROR_WHILE_REGISTERING)
+                  : DpResId(RID_STR_ERROR_WHILE_REVOKING))
+                 + getDisplayName()),
+                static_cast< OWeakObject * >(this), e);
+        }
+        catch (const RuntimeException &) {
+            TOOLS_WARN_EXCEPTION("desktop.deployment", "unexpected");
+            throw;
+        }
+        catch (const CommandFailedException &) {
+            throw;
+        }
+        catch (const CommandAbortedException &) {
+            throw;
+        }
+        catch (const deployment::DeploymentException &) {
+            throw;
+        }
+        catch (const Exception & e) {
+            Any exc( ::cppu::getCaughtException() );
+            throw deployment::DeploymentException(
+                (doRegisterPackage
+                 ? DpResId(RID_STR_ERROR_WHILE_REGISTERING)
+                 : DpResId(RID_STR_ERROR_WHILE_REVOKING))
+                + getDisplayName() + ": " + exc.getValueType().getTypeName() + " \"" + e.Message
+                + "\"",
+                static_cast<OWeakObject *>(this), exc );
+        }
+    }
+    catch (...) {
+        if (action)
+            fireModified();
+        throw;
+    }
+    if (action)
+        fireModified();
+}
+
+
+void Package::registerPackage(
+    sal_Bool startup,
+    Reference<task::XAbortChannel> const & xAbortChannel,
+    Reference<XCommandEnvironment> const & xCmdEnv )
+{
+    if (m_bRemoved)
+        throw deployment::ExtensionRemovedException();
+    processPackage_impl( true /* register */, startup, xAbortChannel, xCmdEnv );
+}
+
+
+void Package::revokePackage(
+    sal_Bool startup,
+    Reference<task::XAbortChannel> const & xAbortChannel,
+    Reference<XCommandEnvironment> const & xCmdEnv )
+{
+    processPackage_impl( false /* revoke */, startup, xAbortChannel, xCmdEnv );
+
+}
+
+PackageRegistryBackend * Package::getMyBackend() const
+{
+    PackageRegistryBackend * pBackend = m_myBackend.get();
+    if (nullptr == pBackend)
+    {
+        //May throw a DisposedException
+        check();
+        //We should never get here...
+        throw RuntimeException(
+            "Failed to get the BackendImpl",
+            static_cast<OWeakObject*>(const_cast<Package *>(this)));
+    }
+    return pBackend;
+}
+
+OUString Package::getRepositoryName()
+{
+    PackageRegistryBackend * backEnd = getMyBackend();
+    return backEnd->getContext();
+}
+
+beans::Optional< OUString > Package::getRegistrationDataURL()
+{
+    if (m_bRemoved)
+        throw deployment::ExtensionRemovedException();
+    return beans::Optional<OUString>();
+}
+
+sal_Bool Package::isRemoved()
+{
+    return m_bRemoved;
+}
+
+Package::TypeInfo::~TypeInfo()
+{
+}
+
+// XPackageTypeInfo
+
+OUString Package::TypeInfo::getMediaType()
+{
+    return m_mediaType;
+}
+
+
+OUString Package::TypeInfo::getDescription()
+{
+    return getShortDescription();
+}
+
+
+OUString Package::TypeInfo::getShortDescription()
+{
+    return m_shortDescr;
+}
+
+OUString Package::TypeInfo::getFileFilter()
+{
+    return m_fileFilter;
+}
+
+Any Package::TypeInfo::getIcon( sal_Bool /*highContrast*/, sal_Bool /*smallIcon*/ )
+{
+    return Any();
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/desktop/source/deployment/registry/dp_backenddb.cxx b/desktop/source/deployment/registry/dp_backenddb.cxx
new file mode 100644
index 000000000..28effd95c
--- /dev/null
+++ b/desktop/source/deployment/registry/dp_backenddb.cxx
@@ -0,0 +1,655 @@
+/* -*- 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 <cppuhelper/exc_hlp.hxx>
+#include <osl/file.hxx>
+#include <com/sun/star/deployment/DeploymentException.hpp>
+#include <com/sun/star/uno/XComponentContext.hpp>
+#include <com/sun/star/xml/dom/DocumentBuilder.hpp>
+#include <com/sun/star/xml/xpath/XPathAPI.hpp>
+#include <com/sun/star/io/XActiveDataSource.hpp>
+#include <com/sun/star/io/XActiveDataControl.hpp>
+#include <dp_misc.h>
+#include <ucbhelper/content.hxx>
+#include <xmlscript/xml_helper.hxx>
+#include <dp_backenddb.hxx>
+
+
+using namespace ::com::sun::star::uno;
+
+
+namespace dp_registry::backend {
+
+BackendDb::BackendDb(
+    Reference<css::uno::XComponentContext> const &  xContext,
+    OUString const & url):
+    m_xContext(xContext)
+{
+    m_urlDb = dp_misc::expandUnoRcUrl(url);
+}
+
+void BackendDb::save()
+{
+    const Reference<css::io::XActiveDataSource> xDataSource(m_doc,css::uno::UNO_QUERY_THROW);
+    std::vector<sal_Int8> bytes;
+    xDataSource->setOutputStream(::xmlscript::createOutputStream(&bytes));
+    const Reference<css::io::XActiveDataControl> xDataControl(m_doc,css::uno::UNO_QUERY_THROW);
+    xDataControl->start();
+
+    const Reference<css::io::XInputStream> xData(
+        ::xmlscript::createInputStream(std::move(bytes)));
+    ::ucbhelper::Content ucbDb(m_urlDb, nullptr, m_xContext);
+    ucbDb.writeStream(xData, true /*replace existing*/);
+}
+
+css::uno::Reference<css::xml::dom::XDocument> const & BackendDb::getDocument()
+{
+    if (!m_doc.is())
+    {
+        const Reference<css::xml::dom::XDocumentBuilder> xDocBuilder(
+            css::xml::dom::DocumentBuilder::create(m_xContext) );
+
+        ::osl::DirectoryItem item;
+        ::osl::File::RC err = ::osl::DirectoryItem::get(m_urlDb, item);
+        if (err == ::osl::File::E_None)
+        {
+            ::ucbhelper::Content descContent(
+                m_urlDb, css::uno::Reference<css::ucb::XCommandEnvironment>(),
+                m_xContext);
+            Reference<css::io::XInputStream> xIn = descContent.openStream();
+            m_doc = xDocBuilder->parse(xIn);
+        }
+        else if (err == ::osl::File::E_NOENT)
+        {
+            //Create a new document and insert some basic stuff
+            m_doc = xDocBuilder->newDocument();
+            const Reference<css::xml::dom::XElement> rootNode =
+                m_doc->createElementNS(getDbNSName(), getNSPrefix() +
+                                       ":" + getRootElementName());
+
+            m_doc->appendChild(Reference<css::xml::dom::XNode>(
+                                   rootNode, UNO_QUERY_THROW));
+            save();
+        }
+        else
+            throw css::uno::RuntimeException(
+                "Extension manager could not access database file:"
+                + m_urlDb, nullptr);
+
+        if (!m_doc.is())
+            throw css::uno::RuntimeException(
+                "Extension manager could not get root node of data base file: "
+                      + m_urlDb, nullptr);
+    }
+
+    return m_doc;
+}
+
+Reference<css::xml::xpath::XXPathAPI> const & BackendDb::getXPathAPI()
+{
+    if (!m_xpathApi.is())
+    {
+        m_xpathApi = css::xml::xpath::XPathAPI::create( m_xContext );
+
+        m_xpathApi->registerNS( getNSPrefix(), getDbNSName() );
+    }
+
+    return m_xpathApi;
+}
+
+void BackendDb::removeElement(OUString const & sXPathExpression)
+{
+    try
+    {
+        const Reference<css::xml::dom::XDocument> doc = getDocument();
+        const Reference<css::xml::dom::XNode> root = doc->getFirstChild();
+        const Reference<css::xml::xpath::XXPathAPI> xpathApi = getXPathAPI();
+        //find the extension element that is to be removed
+        const Reference<css::xml::dom::XNode> aNode =
+            xpathApi->selectSingleNode(root, sXPathExpression);
+
+        if (aNode.is())
+        {
+            root->removeChild(aNode);
+            save();
+        }
+
+#if    OSL_DEBUG_LEVEL > 0
+        //There must not be any other entry with the same url
+        const Reference<css::xml::dom::XNode> nextNode =
+            xpathApi->selectSingleNode(root, sXPathExpression);
+        OSL_ASSERT(! nextNode.is());
+#endif
+    }
+    catch(const css::uno::Exception &)
+    {
+        Any exc( ::cppu::getCaughtException() );
+        throw css::deployment::DeploymentException(
+            "Extension Manager: failed to write data entry in backend db: " +
+            m_urlDb, nullptr, exc);
+    }
+}
+
+void BackendDb::removeEntry(std::u16string_view url)
+{
+    const OUString sKeyElement = getKeyElementName();
+    const OUString sPrefix = getNSPrefix();
+    OUString sExpression =
+        sPrefix +
+        ":" +
+        sKeyElement +
+        "[@url = \"" +
+        url +
+        "\"]";
+
+    removeElement(sExpression);
+}
+
+void BackendDb::revokeEntry(std::u16string_view url)
+{
+    try
+    {
+        Reference<css::xml::dom::XElement> entry(getKeyElement(url), UNO_QUERY);
+        if (entry.is())
+        {
+            entry->setAttribute("revoked", "true");
+            save();
+        }
+    }
+    catch(const css::uno::Exception &)
+    {
+        Any exc( ::cppu::getCaughtException() );
+        throw css::deployment::DeploymentException(
+            "Extension Manager: failed to revoke data entry in backend db: " +
+            m_urlDb, nullptr, exc);
+    }
+}
+
+bool BackendDb::activateEntry(std::u16string_view url)
+{
+    try
+    {
+        bool ret = false;
+        Reference<css::xml::dom::XElement> entry(getKeyElement(url), UNO_QUERY);
+        if (entry.is())
+        {
+            //no attribute "active" means it is active, that is, registered.
+            entry->removeAttribute("revoked");
+            save();
+            ret = true;
+        }
+        return ret;
+    }
+    catch(const css::uno::Exception &)
+    {
+        Any exc( ::cppu::getCaughtException() );
+        throw css::deployment::DeploymentException(
+            "Extension Manager: failed to revoke data entry in backend db: " +
+            m_urlDb, nullptr, exc);
+    }
+}
+
+bool BackendDb::hasActiveEntry(std::u16string_view url)
+{
+    try
+    {
+        bool ret = false;
+        Reference<css::xml::dom::XElement> entry(getKeyElement(url), UNO_QUERY);
+        if (entry.is())
+        {
+            OUString sActive = entry->getAttribute("revoked");
+            if (!(sActive == "true"))
+                ret = true;
+        }
+        return ret;
+
+    }
+    catch(const css::uno::Exception &)
+    {
+        Any exc( ::cppu::getCaughtException() );
+        throw css::deployment::DeploymentException(
+            "Extension Manager: failed to determine an active entry in backend db: " +
+            m_urlDb, nullptr, exc);
+    }
+}
+
+Reference<css::xml::dom::XNode> BackendDb::getKeyElement(
+    std::u16string_view url)
+{
+    try
+    {
+        const OUString sPrefix = getNSPrefix();
+        const OUString sKeyElement = getKeyElementName();
+        OUString sExpression =
+            sPrefix +
+            ":" +
+            sKeyElement +
+            "[@url = \"" +
+            url +
+            "\"]";
+
+        const Reference<css::xml::dom::XDocument> doc = getDocument();
+        const Reference<css::xml::dom::XNode> root = doc->getFirstChild();
+        const Reference<css::xml::xpath::XXPathAPI> xpathApi = getXPathAPI();
+        return xpathApi->selectSingleNode(root, sExpression);
+    }
+    catch(const css::uno::Exception &)
+    {
+        Any exc( ::cppu::getCaughtException() );
+        throw css::deployment::DeploymentException(
+            "Extension Manager: failed to read key element in backend db: " +
+            m_urlDb, nullptr, exc);
+    }
+}
+
+//Only writes the data if there is at least one entry
+void BackendDb::writeVectorOfPair(
+    std::vector< std::pair< OUString, OUString > > const & vecPairs,
+    std::u16string_view sVectorTagName,
+    std::u16string_view sPairTagName,
+    std::u16string_view sFirstTagName,
+    std::u16string_view sSecondTagName,
+    css::uno::Reference<css::xml::dom::XNode> const & xParent)
+{
+    try{
+        if (vecPairs.empty())
+            return;
+        const OUString sNameSpace = getDbNSName();
+        OSL_ASSERT(!sNameSpace.isEmpty());
+        const OUString sPrefix(getNSPrefix() + ":");
+        const Reference<css::xml::dom::XDocument> doc = getDocument();
+
+        const Reference<css::xml::dom::XElement> vectorNode(
+            doc->createElementNS(sNameSpace, sPrefix + sVectorTagName));
+
+        xParent->appendChild(
+            Reference<css::xml::dom::XNode>(
+                vectorNode, css::uno::UNO_QUERY_THROW));
+        for (auto const& vecPair : vecPairs)
+        {
+            const Reference<css::xml::dom::XElement> pairNode(
+                doc->createElementNS(sNameSpace, sPrefix + sPairTagName));
+
+            vectorNode->appendChild(
+                Reference<css::xml::dom::XNode>(
+                    pairNode, css::uno::UNO_QUERY_THROW));
+
+            const Reference<css::xml::dom::XElement> firstNode(
+                doc->createElementNS(sNameSpace, sPrefix + sFirstTagName));
+
+            pairNode->appendChild(
+                Reference<css::xml::dom::XNode>(
+                    firstNode, css::uno::UNO_QUERY_THROW));
+
+            const Reference<css::xml::dom::XText> firstTextNode(
+                doc->createTextNode( vecPair.first));
+
+            firstNode->appendChild(
+                Reference<css::xml::dom::XNode>(
+                    firstTextNode, css::uno::UNO_QUERY_THROW));
+
+            const Reference<css::xml::dom::XElement> secondNode(
+                doc->createElementNS(sNameSpace, sPrefix + sSecondTagName));
+
+            pairNode->appendChild(
+                Reference<css::xml::dom::XNode>(
+                    secondNode, css::uno::UNO_QUERY_THROW));
+
+            const Reference<css::xml::dom::XText> secondTextNode(
+                doc->createTextNode( vecPair.second));
+
+            secondNode->appendChild(
+                Reference<css::xml::dom::XNode>(
+                    secondTextNode, css::uno::UNO_QUERY_THROW));
+        }
+    }
+    catch(const css::uno::Exception &)
+    {
+        Any exc( ::cppu::getCaughtException() );
+        throw css::deployment::DeploymentException(
+            "Extension Manager: failed to write data entry in backend db: " +
+            m_urlDb, nullptr, exc);
+    }
+}
+
+std::vector< std::pair< OUString, OUString > >
+BackendDb::readVectorOfPair(
+    Reference<css::xml::dom::XNode> const & parent,
+    std::u16string_view sListTagName,
+    std::u16string_view sPairTagName,
+    std::u16string_view sFirstTagName,
+    std::u16string_view sSecondTagName)
+{
+    try
+    {
+        OSL_ASSERT(parent.is());
+        const OUString sPrefix(getNSPrefix() + ":");
+        const Reference<css::xml::xpath::XXPathAPI> xpathApi = getXPathAPI();
+        const OUString sExprPairs(
+            sPrefix + sListTagName + "/" + sPrefix + sPairTagName);
+        const Reference<css::xml::dom::XNodeList> listPairs =
+            xpathApi->selectNodeList(parent, sExprPairs);
+
+        std::vector< std::pair< OUString, OUString > > retVector;
+        sal_Int32 length = listPairs->getLength();
+        for (sal_Int32 i = 0; i < length; i++)
+        {
+            const Reference<css::xml::dom::XNode> aPair = listPairs->item(i);
+            const OUString sExprFirst(sPrefix + sFirstTagName + "/text()");
+            const Reference<css::xml::dom::XNode> first =
+                xpathApi->selectSingleNode(aPair, sExprFirst);
+
+            const OUString sExprSecond(sPrefix + sSecondTagName + "/text()");
+            const Reference<css::xml::dom::XNode> second =
+                xpathApi->selectSingleNode(aPair, sExprSecond);
+            OSL_ASSERT(first.is() && second.is());
+
+            retVector.emplace_back(
+                                    first->getNodeValue(), second->getNodeValue());
+        }
+        return retVector;
+    }
+    catch(const css::uno::Exception &)
+    {
+        Any exc( ::cppu::getCaughtException() );
+        throw css::deployment::DeploymentException(
+            "Extension Manager: failed to read data entry in backend db: " +
+            m_urlDb, nullptr, exc);
+    }
+}
+
+//Only writes the data if there is at least one entry
+void BackendDb::writeSimpleList(
+    std::deque< OUString> const & list,
+    std::u16string_view sListTagName,
+    std::u16string_view sMemberTagName,
+    Reference<css::xml::dom::XNode> const & xParent)
+{
+    try
+    {
+        if (list.empty())
+            return;
+        const OUString sNameSpace = getDbNSName();
+        const OUString sPrefix(getNSPrefix() + ":");
+        const Reference<css::xml::dom::XDocument> doc = getDocument();
+
+        const Reference<css::xml::dom::XElement> listNode(
+            doc->createElementNS(sNameSpace, sPrefix + sListTagName));
+
+        xParent->appendChild(
+            Reference<css::xml::dom::XNode>(
+                listNode, css::uno::UNO_QUERY_THROW));
+
+        for (auto const& elem : list)
+        {
+            const Reference<css::xml::dom::XNode> memberNode(
+                doc->createElementNS(sNameSpace, sPrefix + sMemberTagName), css::uno::UNO_QUERY_THROW);
+
+            listNode->appendChild(memberNode);
+
+            const Reference<css::xml::dom::XNode> textNode(
+                doc->createTextNode(elem), css::uno::UNO_QUERY_THROW);
+
+            memberNode->appendChild(textNode);
+        }
+    }
+    catch(const css::uno::Exception &)
+    {
+        Any exc( ::cppu::getCaughtException() );
+        throw css::deployment::DeploymentException(
+            "Extension Manager: failed to write data entry in backend db: " +
+            m_urlDb, nullptr, exc);
+    }
+}
+
+//Writes only the element if is has a value.
+//The prefix is automatically added to the element name
+void BackendDb::writeSimpleElement(
+    std::u16string_view sElementName, OUString const & value,
+    Reference<css::xml::dom::XNode> const & xParent)
+{
+    try
+    {
+        if (value.isEmpty())
+            return;
+        const OUString sPrefix = getNSPrefix();
+        const Reference<css::xml::dom::XDocument> doc = getDocument();
+        const OUString sNameSpace = getDbNSName();
+        const Reference<css::xml::dom::XNode> dataNode(
+            doc->createElementNS(sNameSpace, sPrefix + ":" + sElementName),
+            UNO_QUERY_THROW);
+        xParent->appendChild(dataNode);
+
+        const Reference<css::xml::dom::XNode> dataValue(
+            doc->createTextNode(value), UNO_QUERY_THROW);
+        dataNode->appendChild(dataValue);
+    }
+    catch(const css::uno::Exception &)
+    {
+        Any exc( ::cppu::getCaughtException() );
+        throw css::deployment::DeploymentException(
+            "Extension Manager: failed to write data entry(writeSimpleElement) in backend db: " +
+            m_urlDb, nullptr, exc);
+    }
+
+}
+
+/// The key elements have a url attribute and are always children of the root element.
+Reference<css::xml::dom::XNode> BackendDb::writeKeyElement(
+    OUString const & url)
+{
+    try
+    {
+        const OUString sNameSpace = getDbNSName();
+        const OUString sPrefix = getNSPrefix();
+        const OUString sElementName = getKeyElementName();
+        const Reference<css::xml::dom::XDocument> doc = getDocument();
+        const Reference<css::xml::dom::XNode> root = doc->getFirstChild();
+
+        //Check if there are an entry with the same url. This can be the case if the
+        //status of an XPackage is ambiguous. In this case a call to activateExtension
+        //(dp_extensionmanager.cxx), will register the package again. See also
+        //Package::processPackage_impl in dp_backend.cxx.
+        //A package can become
+        //invalid after its successful registration, for example if a second extension with
+        //the same service is installed.
+        const OUString sExpression(
+            sPrefix + ":" + sElementName + "[@url = \"" + url + "\"]");
+        const Reference<css::xml::dom::XNode> existingNode =
+            getXPathAPI()->selectSingleNode(root, sExpression);
+        if (existingNode.is())
+        {
+            OSL_ASSERT(false);
+            //replace the existing entry.
+            removeEntry(url);
+        }
+
+        const Reference<css::xml::dom::XElement> keyElement(
+            doc->createElementNS(sNameSpace, sPrefix +  ":" + sElementName));
+
+        keyElement->setAttribute("url", url);
+
+        const Reference<css::xml::dom::XNode> keyNode(
+            keyElement, UNO_QUERY_THROW);
+        root->appendChild(keyNode);
+        return keyNode;
+    }
+    catch(const css::uno::Exception &)
+    {
+        Any exc( ::cppu::getCaughtException() );
+        throw css::deployment::DeploymentException(
+            "Extension Manager: failed to write key element in backend db: " +
+            m_urlDb, nullptr, exc);
+    }
+}
+
+OUString BackendDb::readSimpleElement(
+    std::u16string_view sElementName, Reference<css::xml::dom::XNode> const & xParent)
+{
+    try
+    {
+        const OUString sPrefix = getNSPrefix();
+        const OUString sExpr(sPrefix + ":" + sElementName + "/text()");
+        const Reference<css::xml::xpath::XXPathAPI> xpathApi = getXPathAPI();
+        const Reference<css::xml::dom::XNode> val =
+            xpathApi->selectSingleNode(xParent, sExpr);
+        if (val.is())
+            return val->getNodeValue();
+        return OUString();
+    }
+    catch(const css::uno::Exception &)
+    {
+        Any exc( ::cppu::getCaughtException() );
+        throw css::deployment::DeploymentException(
+            "Extension Manager: failed to read data (readSimpleElement) in backend db: " +
+            m_urlDb, nullptr, exc);
+    }
+}
+
+
+std::deque< OUString> BackendDb::readList(
+    Reference<css::xml::dom::XNode> const & parent,
+    std::u16string_view sListTagName,
+    std::u16string_view sMemberTagName)
+{
+    try
+    {
+        OSL_ASSERT(parent.is());
+        const OUString sPrefix(getNSPrefix() + ":");
+        const Reference<css::xml::xpath::XXPathAPI> xpathApi = getXPathAPI();
+        const OUString sExprList(
+            sPrefix + sListTagName + "/" + sPrefix + sMemberTagName + "/text()");
+        const Reference<css::xml::dom::XNodeList> list =
+            xpathApi->selectNodeList(parent, sExprList);
+
+        std::deque<OUString > retList;
+        sal_Int32 length = list->getLength();
+        for (sal_Int32 i = 0; i < length; i++)
+        {
+            const Reference<css::xml::dom::XNode> member = list->item(i);
+            retList.push_back(member->getNodeValue());
+        }
+        return retList;
+    }
+    catch(const css::uno::Exception &)
+    {
+        Any exc( ::cppu::getCaughtException() );
+        throw css::deployment::DeploymentException(
+            "Extension Manager: failed to read data entry in backend db: " +
+            m_urlDb, nullptr, exc);
+    }
+}
+
+std::vector<OUString> BackendDb::getOneChildFromAllEntries(
+    std::u16string_view name)
+{
+    try
+    {
+        std::vector<OUString> listRet;
+        Reference<css::xml::dom::XDocument> doc = getDocument();
+        Reference<css::xml::dom::XNode> root = doc->getFirstChild();
+
+        Reference<css::xml::xpath::XXPathAPI> xpathApi = getXPathAPI();
+        const OUString sPrefix = getNSPrefix();
+        const OUString sKeyElement = getKeyElementName();
+        OUString sNodeSelectExpr =
+            sPrefix +
+            ":" +
+            sKeyElement +
+            "/" +
+            sPrefix +
+            ":" +
+            name +
+            "/text()";
+
+        Reference<css::xml::dom::XNodeList> nodes =
+            xpathApi->selectNodeList(root, sNodeSelectExpr);
+        if (nodes.is())
+        {
+            sal_Int32 length = nodes->getLength();
+            for (sal_Int32 i = 0; i < length; i++)
+                listRet.push_back(nodes->item(i)->getNodeValue());
+        }
+        return listRet;
+    }
+    catch ( const css::deployment::DeploymentException& )
+    {
+        throw;
+    }
+    catch(const css::uno::Exception &)
+    {
+        Any exc( ::cppu::getCaughtException() );
+        throw css::deployment::DeploymentException(
+            "Extension Manager: failed to read data entry in backend db: " +
+            m_urlDb, nullptr, exc);
+    }
+}
+
+
+RegisteredDb::RegisteredDb(
+    Reference<XComponentContext> const &  xContext,
+    OUString const & url):BackendDb(xContext, url)
+{
+}
+
+void RegisteredDb::addEntry(OUString const & url)
+{
+    try{
+        if (!activateEntry(url))
+        {
+            const OUString sNameSpace = getDbNSName();
+            const OUString sPrefix = getNSPrefix();
+            const OUString sEntry = getKeyElementName();
+
+            Reference<css::xml::dom::XDocument> doc = getDocument();
+            Reference<css::xml::dom::XNode> root = doc->getFirstChild();
+
+#if    OSL_DEBUG_LEVEL > 0
+            //There must not be yet an entry with the same url
+            OUString sExpression(
+                sPrefix + ":" + sEntry + "[@url = \"" + url + "\"]");
+            Reference<css::xml::dom::XNode> _extensionNode =
+                getXPathAPI()->selectSingleNode(root, sExpression);
+            OSL_ASSERT(! _extensionNode.is());
+#endif
+            Reference<css::xml::dom::XElement> helpElement(
+                doc->createElementNS(sNameSpace, sPrefix +  ":" + sEntry));
+
+            helpElement->setAttribute("url", url);
+
+            Reference<css::xml::dom::XNode> helpNode(
+                helpElement, UNO_QUERY_THROW);
+            root->appendChild(helpNode);
+
+            save();
+        }
+    }
+    catch(const css::uno::Exception &)
+    {
+        Any exc( ::cppu::getCaughtException() );
+        throw css::deployment::DeploymentException(
+            "Extension Manager: failed to write data entry in backend db: " +
+            m_urlDb, nullptr, exc);
+    }
+}
+
+} // namespace dp_registry
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/desktop/source/deployment/registry/dp_registry.cxx b/desktop/source/deployment/registry/dp_registry.cxx
new file mode 100644
index 000000000..961afe7bb
--- /dev/null
+++ b/desktop/source/deployment/registry/dp_registry.cxx
@@ -0,0 +1,528 @@
+/* -*- 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 <sal/config.h>
+#include <sal/log.hxx>
+
+#include <dp_shared.hxx>
+#include <dp_package.hxx>
+#include <strings.hrc>
+#include <dp_registry.hxx>
+#include <dp_misc.h>
+#include <dp_ucb.h>
+#include <osl/diagnose.h>
+#include <rtl/ustrbuf.hxx>
+#include <rtl/uri.hxx>
+#include <cppuhelper/basemutex.hxx>
+#include <cppuhelper/compbase.hxx>
+#include <comphelper/sequence.hxx>
+#include <ucbhelper/content.hxx>
+#include <o3tl/string_view.hxx>
+#include <com/sun/star/ucb/ContentCreationException.hpp>
+#include <com/sun/star/uno/DeploymentException.hpp>
+#include <com/sun/star/lang/DisposedException.hpp>
+#include <com/sun/star/lang/IllegalArgumentException.hpp>
+#include <com/sun/star/lang/XServiceInfo.hpp>
+#include <com/sun/star/lang/XSingleComponentFactory.hpp>
+#include <com/sun/star/lang/XSingleServiceFactory.hpp>
+#include <com/sun/star/util/XUpdatable.hpp>
+#include <com/sun/star/container/XContentEnumerationAccess.hpp>
+#include <com/sun/star/deployment/XPackageTypeInfo.hpp>
+#include <com/sun/star/deployment/XPackageRegistry.hpp>
+#include <set>
+#include <string_view>
+#include <unordered_map>
+#include <unordered_set>
+
+using namespace ::dp_misc;
+using namespace ::com::sun::star;
+using namespace ::com::sun::star::uno;
+using namespace ::com::sun::star::ucb;
+
+
+namespace dp_registry {
+
+namespace {
+
+typedef ::cppu::WeakComponentImplHelper<
+    deployment::XPackageRegistry, util::XUpdatable > t_helper;
+
+
+class PackageRegistryImpl : private cppu::BaseMutex, public t_helper
+{
+    struct ci_string_hash {
+        std::size_t operator () ( OUString const & str ) const {
+            return str.toAsciiLowerCase().hashCode();
+        }
+    };
+    struct ci_string_equals {
+        bool operator () ( std::u16string_view str1, std::u16string_view str2 ) const{
+            return o3tl::equalsIgnoreAsciiCase( str1, str2 );
+        }
+    };
+    typedef std::unordered_map<
+        OUString, Reference<deployment::XPackageRegistry>,
+        ci_string_hash, ci_string_equals > t_string2registry;
+    typedef std::unordered_map<
+        OUString, OUString,
+        ci_string_hash, ci_string_equals > t_string2string;
+    typedef std::set<
+        Reference<deployment::XPackageRegistry> > t_registryset;
+
+    t_string2registry m_mediaType2backend;
+    t_string2string m_filter2mediaType;
+    t_registryset m_ambiguousBackends;
+    t_registryset m_allBackends;
+    std::vector< Reference<deployment::XPackageTypeInfo> > m_typesInfos;
+
+    void insertBackend(
+        Reference<deployment::XPackageRegistry> const & xBackend );
+
+protected:
+    void check();
+    virtual void SAL_CALL disposing() override;
+
+    virtual ~PackageRegistryImpl() override;
+    PackageRegistryImpl() : t_helper( m_aMutex ) {}
+
+
+public:
+    static Reference<deployment::XPackageRegistry> create(
+        OUString const & context,
+        OUString const & cachePath,
+        Reference<XComponentContext> const & xComponentContext );
+
+    // XUpdatable
+    virtual void SAL_CALL update() override;
+
+    // XPackageRegistry
+    virtual Reference<deployment::XPackage> SAL_CALL bindPackage(
+        OUString const & url, OUString const & mediaType, sal_Bool bRemoved,
+        OUString const & identifier, Reference<XCommandEnvironment> const & xCmdEnv ) override;
+    virtual Sequence< Reference<deployment::XPackageTypeInfo> > SAL_CALL
+    getSupportedPackageTypes() override;
+    virtual void SAL_CALL packageRemoved(OUString const & url, OUString const & mediaType) override;
+
+};
+
+
+void PackageRegistryImpl::check()
+{
+    ::osl::MutexGuard guard( m_aMutex );
+    if (rBHelper.bInDispose || rBHelper.bDisposed) {
+        throw lang::DisposedException(
+            "PackageRegistry instance has already been disposed!",
+            static_cast<OWeakObject *>(this) );
+    }
+}
+
+
+void PackageRegistryImpl::disposing()
+{
+    // dispose all backends:
+    for (auto const& backend : m_allBackends)
+    {
+        try_dispose(backend);
+    }
+    m_mediaType2backend = t_string2registry();
+    m_ambiguousBackends = t_registryset();
+    m_allBackends = t_registryset();
+
+    t_helper::disposing();
+}
+
+
+PackageRegistryImpl::~PackageRegistryImpl()
+{
+}
+
+
+OUString normalizeMediaType( std::u16string_view mediaType )
+{
+    OUStringBuffer buf;
+    sal_Int32 index = 0;
+    for (;;) {
+        buf.append( o3tl::trim(o3tl::getToken(mediaType, 0, '/', index )) );
+        if (index < 0)
+            break;
+        buf.append( '/' );
+    }
+    return buf.makeStringAndClear();
+}
+
+
+void PackageRegistryImpl::packageRemoved(
+    OUString const & url, OUString const & mediaType)
+{
+    const t_string2registry::const_iterator i =
+        m_mediaType2backend.find(mediaType);
+
+    if (i != m_mediaType2backend.end())
+    {
+        i->second->packageRemoved(url, mediaType);
+    }
+}
+
+void PackageRegistryImpl::insertBackend(
+    Reference<deployment::XPackageRegistry> const & xBackend )
+{
+    m_allBackends.insert( xBackend );
+    std::unordered_set<OUString> ambiguousFilters;
+
+    const Sequence< Reference<deployment::XPackageTypeInfo> > packageTypes(
+        xBackend->getSupportedPackageTypes() );
+    for ( Reference<deployment::XPackageTypeInfo> const & xPackageType : packageTypes )
+    {
+        m_typesInfos.push_back( xPackageType );
+
+        const OUString mediaType( normalizeMediaType(
+                                      xPackageType->getMediaType() ) );
+        std::pair<t_string2registry::iterator, bool> a_insertion(
+            m_mediaType2backend.emplace( mediaType, xBackend ) );
+        if (a_insertion.second)
+        {
+            // add parameterless media-type, too:
+            sal_Int32 semi = mediaType.indexOf( ';' );
+            if (semi >= 0) {
+                m_mediaType2backend.emplace( mediaType.copy( 0, semi ), xBackend );
+            }
+            const OUString fileFilter( xPackageType->getFileFilter() );
+            //The package backend shall also be called to determine the mediatype
+            //(XPackageRegistry.bindPackage) when the URL points to a directory.
+            const bool bExtension = (mediaType == "application/vnd.sun.star.package-bundle");
+            if (fileFilter.isEmpty() || fileFilter == "*.*" || fileFilter == "*" || bExtension)
+            {
+                m_ambiguousBackends.insert( xBackend );
+            }
+            else
+            {
+                sal_Int32 nIndex = 0;
+                do {
+                    OUString token( fileFilter.getToken( 0, ';', nIndex ) );
+                    if (token.match( "*." ))
+                        token = token.copy( 1 );
+                    if (token.isEmpty())
+                        continue;
+                    // mark any further wildcards ambig:
+                    bool ambig = (token.indexOf('*') >= 0 ||
+                                  token.indexOf('?') >= 0);
+                    if (! ambig) {
+                        std::pair<t_string2string::iterator, bool> ins(
+                            m_filter2mediaType.emplace(
+                                    token, mediaType ) );
+                        ambig = !ins.second;
+                        if (ambig) {
+                            // filter has already been in: add previously
+                            // added backend to ambig set
+                            const t_string2registry::const_iterator iFind(
+                                m_mediaType2backend.find(
+                                    /* media-type of pr. added backend */
+                                    ins.first->second ) );
+                            OSL_ASSERT(
+                                iFind != m_mediaType2backend.end() );
+                            if (iFind != m_mediaType2backend.end())
+                                m_ambiguousBackends.insert( iFind->second );
+                        }
+                    }
+                    if (ambig) {
+                        m_ambiguousBackends.insert( xBackend );
+                        // mark filter to be removed later from filters map:
+                        ambiguousFilters.insert( token );
+                    }
+                }
+                while (nIndex >= 0);
+            }
+        }
+#if OSL_DEBUG_LEVEL > 0
+        else
+        {
+            SAL_WARN( "desktop", "more than one PackageRegistryBackend for media-type=\""
+                    << mediaType
+                    << "\" => "
+                    <<  Reference<lang::XServiceInfo>(
+                            xBackend, UNO_QUERY_THROW )->getImplementationName()
+                    << "\"!" );
+        }
+#endif
+    }
+
+    // cut out ambiguous filters:
+    for (auto const& ambiguousFilter : ambiguousFilters)
+    {
+        m_filter2mediaType.erase(ambiguousFilter);
+    }
+}
+
+
+Reference<deployment::XPackageRegistry> PackageRegistryImpl::create(
+    OUString const & context,
+    OUString const & cachePath,
+    Reference<XComponentContext> const & xComponentContext )
+{
+    rtl::Reference<PackageRegistryImpl> that = new PackageRegistryImpl;
+
+    // auto-detect all registered package registries:
+    Reference<container::XEnumeration> xEnum(
+        Reference<container::XContentEnumerationAccess>(
+            xComponentContext->getServiceManager(),
+            UNO_QUERY_THROW )->createContentEnumeration(
+                "com.sun.star.deployment.PackageRegistryBackend" ) );
+    if (xEnum.is())
+    {
+        while (xEnum->hasMoreElements())
+        {
+            Any element( xEnum->nextElement() );
+            Sequence<Any> registryArgs(cachePath.isEmpty() ? 1 : 3 );
+            auto pregistryArgs = registryArgs.getArray();
+            pregistryArgs[ 0 ] <<= context;
+            if (!cachePath.isEmpty())
+            {
+                Reference<lang::XServiceInfo> xServiceInfo(
+                    element, UNO_QUERY_THROW );
+                OUString registryCachePath(
+                    makeURL( cachePath,
+                             ::rtl::Uri::encode(
+                                 xServiceInfo->getImplementationName(),
+                                 rtl_UriCharClassPchar,
+                                 rtl_UriEncodeIgnoreEscapes,
+                                 RTL_TEXTENCODING_UTF8 ) ) );
+                pregistryArgs[ 1 ] <<= registryCachePath;
+                pregistryArgs[ 2 ] <<= false; // readOnly;
+                create_folder( nullptr, registryCachePath,
+                               Reference<XCommandEnvironment>() );
+            }
+
+            Reference<deployment::XPackageRegistry> xBackend;
+            Reference<lang::XSingleComponentFactory> xFac( element, UNO_QUERY );
+            if (xFac.is()) {
+                xBackend.set(
+                    xFac->createInstanceWithArgumentsAndContext(
+                        registryArgs, xComponentContext ), UNO_QUERY );
+            }
+            else {
+                Reference<lang::XSingleServiceFactory> xSingleServiceFac(
+                    element, UNO_QUERY_THROW );
+                xBackend.set(
+                    xSingleServiceFac->createInstanceWithArguments(
+                        registryArgs ), UNO_QUERY );
+            }
+            if (! xBackend.is()) {
+                throw DeploymentException(
+                    "cannot instantiate PackageRegistryBackend service: "
+                    + Reference<lang::XServiceInfo>(
+                        element, UNO_QUERY_THROW )->getImplementationName(),
+                    static_cast<OWeakObject *>(that.get()) );
+            }
+
+            that->insertBackend( xBackend );
+        }
+    }
+
+    // Insert bundle back-end.
+    // Always register as last, because we want to add extensions also as folders
+    // and as a default we accept every folder, which was not recognized by the other
+    // backends.
+    Reference<deployment::XPackageRegistry> extensionBackend =
+        ::dp_registry::backend::bundle::create(
+            that, context, cachePath, xComponentContext);
+    that->insertBackend(extensionBackend);
+
+    Reference<lang::XServiceInfo> xServiceInfo(
+        extensionBackend, UNO_QUERY_THROW );
+
+    OSL_ASSERT(xServiceInfo.is());
+    OUString registryCachePath(
+        makeURL( cachePath,
+                 ::rtl::Uri::encode(
+                     xServiceInfo->getImplementationName(),
+                     rtl_UriCharClassPchar,
+                     rtl_UriEncodeIgnoreEscapes,
+                     RTL_TEXTENCODING_UTF8 ) ) );
+    create_folder( nullptr, registryCachePath, Reference<XCommandEnvironment>());
+
+
+#if OSL_DEBUG_LEVEL > 0
+    // dump tables:
+    {
+        t_registryset allBackends;
+        dp_misc::TRACE("> [dp_registry.cxx] media-type detection:\n\n" );
+        for (auto const& elem : that->m_filter2mediaType)
+        {
+            const Reference<deployment::XPackageRegistry> xBackend(
+                that->m_mediaType2backend.find( elem.second )->second );
+            allBackends.insert( xBackend );
+            dp_misc::TRACE(
+                "extension \"" + elem.first + "\" maps to media-type \"" + elem.second
+                + "\" maps to backend "
+                + Reference<lang::XServiceInfo>(
+                            xBackend, UNO_QUERY_THROW )
+                        ->getImplementationName()
+                + "\n");
+        }
+        dp_misc::TRACE( "> [dp_registry.cxx] ambiguous backends:\n\n" );
+        for (auto const& ambiguousBackend : that->m_ambiguousBackends)
+        {
+            OUStringBuffer buf;
+            buf.append(
+                Reference<lang::XServiceInfo>(
+                    ambiguousBackend, UNO_QUERY_THROW )->getImplementationName() );
+            buf.append( ": " );
+            const Sequence< Reference<deployment::XPackageTypeInfo> > types(
+                ambiguousBackend->getSupportedPackageTypes() );
+            for ( sal_Int32 pos = 0; pos < types.getLength(); ++pos ) {
+                Reference<deployment::XPackageTypeInfo> const & xInfo =
+                    types[ pos ];
+                buf.append( xInfo->getMediaType() );
+                const OUString filter( xInfo->getFileFilter() );
+                if (!filter.isEmpty()) {
+                    buf.append( " (" );
+                    buf.append( filter );
+                    buf.append( ")" );
+                }
+                if (pos < (types.getLength() - 1))
+                    buf.append( ", " );
+            }
+            dp_misc::TRACE(buf + "\n\n");
+        }
+        allBackends.insert( that->m_ambiguousBackends.begin(),
+                            that->m_ambiguousBackends.end() );
+        OSL_ASSERT( allBackends == that->m_allBackends );
+    }
+#endif
+
+    return that;
+}
+
+// XUpdatable: broadcast to backends
+
+void PackageRegistryImpl::update()
+{
+    check();
+    for (auto const& backend : m_allBackends)
+    {
+        const Reference<util::XUpdatable> xUpdatable(backend, UNO_QUERY);
+        if (xUpdatable.is())
+            xUpdatable->update();
+    }
+}
+
+// XPackageRegistry
+
+Reference<deployment::XPackage> PackageRegistryImpl::bindPackage(
+    OUString const & url, OUString const & mediaType_, sal_Bool bRemoved,
+    OUString const & identifier, Reference<XCommandEnvironment> const & xCmdEnv )
+{
+    check();
+    OUString mediaType(mediaType_);
+    if (mediaType.isEmpty())
+    {
+        ::ucbhelper::Content ucbContent;
+        bool bOk=true;
+
+        try
+        {
+            bOk = create_ucb_content(
+                    &ucbContent, url, xCmdEnv, false /* no throw */ )
+                    && !ucbContent.isFolder();
+        }
+        catch (const css::ucb::ContentCreationException&)
+        {
+            bOk = false;
+        }
+
+        if (bOk)
+        {
+            OUString title( StrTitle::getTitle( ucbContent ) );
+            for (;;)
+            {
+                const t_string2string::const_iterator iFind(
+                    m_filter2mediaType.find(title) );
+                if (iFind != m_filter2mediaType.end()) {
+                    mediaType = iFind->second;
+                    break;
+                }
+                sal_Int32 point = title.indexOf( '.', 1 /* consume . */ );
+                if (point < 0)
+                    break;
+                title = title.copy(point);
+            }
+        }
+    }
+    if (mediaType.isEmpty())
+    {
+        // try ambiguous backends:
+        for (auto const& ambiguousBackend : m_ambiguousBackends)
+        {
+            try {
+                return ambiguousBackend->bindPackage( url, mediaType, bRemoved,
+                    identifier, xCmdEnv );
+            }
+            catch (const lang::IllegalArgumentException &) {
+            }
+        }
+        throw lang::IllegalArgumentException(
+            DpResId(RID_STR_CANNOT_DETECT_MEDIA_TYPE) + url,
+            static_cast<OWeakObject *>(this), static_cast<sal_Int16>(-1) );
+    }
+    else
+    {
+        // get backend by media-type:
+        t_string2registry::const_iterator iFind(
+            m_mediaType2backend.find( normalizeMediaType(mediaType) ) );
+        if (iFind == m_mediaType2backend.end()) {
+            // xxx todo: more sophisticated media-type argument parsing...
+            sal_Int32 q = mediaType.indexOf( ';' );
+            if (q >= 0) {
+                iFind = m_mediaType2backend.find(
+                    normalizeMediaType(
+                        // cut parameters:
+                        mediaType.subView( 0, q ) ) );
+            }
+        }
+        if (iFind == m_mediaType2backend.end()) {
+            throw lang::IllegalArgumentException(
+                DpResId(RID_STR_UNSUPPORTED_MEDIA_TYPE) + mediaType,
+                static_cast<OWeakObject *>(this), static_cast<sal_Int16>(-1) );
+        }
+        return iFind->second->bindPackage( url, mediaType, bRemoved,
+            identifier, xCmdEnv );
+    }
+}
+
+
+Sequence< Reference<deployment::XPackageTypeInfo> >
+PackageRegistryImpl::getSupportedPackageTypes()
+{
+    return comphelper::containerToSequence(m_typesInfos);
+}
+} // anon namespace
+
+
+Reference<deployment::XPackageRegistry> create(
+    OUString const & context,
+    OUString const & cachePath,
+    Reference<XComponentContext> const & xComponentContext )
+{
+    return PackageRegistryImpl::create(
+        context, cachePath, xComponentContext );
+}
+
+} // namespace dp_registry
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/desktop/source/deployment/registry/executable/dp_executable.cxx b/desktop/source/deployment/registry/executable/dp_executable.cxx
new file mode 100644
index 000000000..40b253587
--- /dev/null
+++ b/desktop/source/deployment/registry/executable/dp_executable.cxx
@@ -0,0 +1,336 @@
+/* -*- 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 <memory>
+#include <string_view>
+
+#include <dp_misc.h>
+#include <dp_backend.h>
+#include <dp_ucb.h>
+#include <dp_interact.h>
+#include <com/sun/star/lang/IllegalArgumentException.hpp>
+#include <osl/file.hxx>
+#include <ucbhelper/content.hxx>
+#include <svl/inettype.hxx>
+#include "dp_executablebackenddb.hxx"
+#include <cppuhelper/supportsservice.hxx>
+
+using namespace ::com::sun::star;
+using namespace ::com::sun::star::uno;
+using namespace ::com::sun::star::ucb;
+using namespace dp_misc;
+
+namespace dp_registry::backend::executable {
+namespace {
+
+class BackendImpl : public ::dp_registry::backend::PackageRegistryBackend
+{
+    class ExecutablePackageImpl : public ::dp_registry::backend::Package
+    {
+        BackendImpl * getMyBackend() const;
+
+        // Package
+        virtual beans::Optional< beans::Ambiguous<sal_Bool> > isRegistered_(
+            ::osl::ResettableMutexGuard & guard,
+            ::rtl::Reference<dp_misc::AbortChannel> const & abortChannel,
+            Reference<XCommandEnvironment> const & xCmdEnv ) override;
+        virtual void processPackage_(
+            ::osl::ResettableMutexGuard & guard,
+            bool registerPackage,
+            bool startup,
+            ::rtl::Reference<dp_misc::AbortChannel> const & abortChannel,
+            Reference<XCommandEnvironment> const & xCmdEnv ) override;
+
+        bool getFileAttributes(sal_uInt64& out_Attributes);
+        bool isUrlTargetInExtension() const;
+
+    public:
+        ExecutablePackageImpl(
+            ::rtl::Reference<PackageRegistryBackend> const & myBackend,
+            OUString const & url, OUString const & name,
+            Reference<deployment::XPackageTypeInfo> const & xPackageType,
+            bool bRemoved, OUString const & identifier)
+            : Package( myBackend, url, name, name /* display-name */,
+                       xPackageType, bRemoved, identifier)
+            {}
+    };
+    friend class ExecutablePackageImpl;
+
+    // PackageRegistryBackend
+    virtual Reference<deployment::XPackage> bindPackage_(
+        OUString const & url, OUString const & mediaType, bool bRemoved,
+        OUString const & identifier, Reference<XCommandEnvironment> const & xCmdEnv ) override;
+
+    void addDataToDb(OUString const & url);
+    bool hasActiveEntry(std::u16string_view url);
+    void revokeEntryFromDb(std::u16string_view url);
+
+    Reference<deployment::XPackageTypeInfo> m_xExecutableTypeInfo;
+    std::unique_ptr<ExecutableBackendDb> m_backendDb;
+public:
+    BackendImpl( Sequence<Any> const & args,
+                 Reference<XComponentContext> const & xComponentContext );
+
+    // XServiceInfo
+    virtual OUString SAL_CALL getImplementationName() override;
+    virtual sal_Bool SAL_CALL supportsService( const OUString& ServiceName ) override;
+    virtual css::uno::Sequence< OUString > SAL_CALL getSupportedServiceNames() override;
+
+    // XPackageRegistry
+    virtual Sequence< Reference<deployment::XPackageTypeInfo> > SAL_CALL
+    getSupportedPackageTypes() override;
+    virtual void SAL_CALL packageRemoved(OUString const & url, OUString const & mediaType) override;
+
+};
+
+
+BackendImpl::BackendImpl(
+    Sequence<Any> const & args,
+    Reference<XComponentContext> const & xComponentContext )
+    : PackageRegistryBackend( args, xComponentContext ),
+      m_xExecutableTypeInfo(new Package::TypeInfo(
+                                "application/vnd.sun.star.executable",
+                                "", "Executable" ) )
+{
+    if (!transientMode())
+    {
+        OUString dbFile = makeURL(getCachePath(), "backenddb.xml");
+        m_backendDb.reset(
+            new ExecutableBackendDb(getComponentContext(), dbFile));
+    }
+}
+
+// XServiceInfo
+OUString BackendImpl::getImplementationName()
+{
+    return "com.sun.star.comp.deployment.executable.PackageRegistryBackend";
+}
+
+sal_Bool BackendImpl::supportsService( const OUString& ServiceName )
+{
+    return cppu::supportsService(this, ServiceName);
+}
+
+css::uno::Sequence< OUString > BackendImpl::getSupportedServiceNames()
+{
+    return { BACKEND_SERVICE_NAME };
+}
+
+void BackendImpl::addDataToDb(OUString const & url)
+{
+    if (m_backendDb)
+        m_backendDb->addEntry(url);
+}
+
+void BackendImpl::revokeEntryFromDb(std::u16string_view url)
+{
+    if (m_backendDb)
+        m_backendDb->revokeEntry(url);
+}
+
+bool BackendImpl::hasActiveEntry(std::u16string_view url)
+{
+    if (m_backendDb)
+        return m_backendDb->hasActiveEntry(url);
+    return false;
+}
+
+
+// XPackageRegistry
+Sequence< Reference<deployment::XPackageTypeInfo> >
+BackendImpl::getSupportedPackageTypes()
+{
+    return Sequence<Reference<deployment::XPackageTypeInfo> >(
+        & m_xExecutableTypeInfo, 1);
+}
+
+void BackendImpl::packageRemoved(OUString const & url, OUString const & /*mediaType*/)
+{
+    if (m_backendDb)
+        m_backendDb->removeEntry(url);
+}
+
+// PackageRegistryBackend
+Reference<deployment::XPackage> BackendImpl::bindPackage_(
+    OUString const & url, OUString const & mediaType, bool bRemoved,
+    OUString const & identifier, Reference<XCommandEnvironment> const & xCmdEnv )
+{
+    if (mediaType.isEmpty())
+    {
+        throw lang::IllegalArgumentException(
+            StrCannotDetectMediaType() + url,
+            static_cast<OWeakObject *>(this), static_cast<sal_Int16>(-1) );
+    }
+
+    OUString type, subType;
+    INetContentTypeParameterList params;
+    if (INetContentTypes::parse( mediaType, type, subType, &params ))
+    {
+        if (type.equalsIgnoreAsciiCase("application"))
+        {
+            OUString name;
+            if (!bRemoved)
+            {
+                ::ucbhelper::Content ucbContent(
+                    url, xCmdEnv, getComponentContext() );
+                name = StrTitle::getTitle( ucbContent );
+            }
+            if (subType.equalsIgnoreAsciiCase("vnd.sun.star.executable"))
+            {
+                return new BackendImpl::ExecutablePackageImpl(
+                    this, url, name,  m_xExecutableTypeInfo, bRemoved,
+                    identifier);
+            }
+        }
+    }
+    return Reference<deployment::XPackage>();
+}
+
+
+// Package
+BackendImpl * BackendImpl::ExecutablePackageImpl::getMyBackend() const
+{
+    BackendImpl * pBackend = static_cast<BackendImpl *>(m_myBackend.get());
+    if (nullptr == pBackend)
+    {
+        //May throw a DisposedException
+        check();
+        //We should never get here...
+        throw RuntimeException( "Failed to get the BackendImpl",
+            static_cast<OWeakObject*>(const_cast<ExecutablePackageImpl *>(this)));
+    }
+    return pBackend;
+}
+
+beans::Optional< beans::Ambiguous<sal_Bool> >
+BackendImpl::ExecutablePackageImpl::isRegistered_(
+    ::osl::ResettableMutexGuard &,
+    ::rtl::Reference<dp_misc::AbortChannel> const &,
+    Reference<XCommandEnvironment> const & )
+{
+    bool registered = getMyBackend()->hasActiveEntry(getURL());
+    return beans::Optional< beans::Ambiguous<sal_Bool> >(
+            true /* IsPresent */,
+                beans::Ambiguous<sal_Bool>(
+                    registered, false /* IsAmbiguous */ ) );
+}
+
+void BackendImpl::ExecutablePackageImpl::processPackage_(
+    ::osl::ResettableMutexGuard &,
+    bool doRegisterPackage,
+    bool /*startup*/,
+    ::rtl::Reference<dp_misc::AbortChannel> const & abortChannel,
+    Reference<XCommandEnvironment> const & /*xCmdEnv*/ )
+{
+    checkAborted(abortChannel);
+    if (doRegisterPackage)
+    {
+        if (!isUrlTargetInExtension())
+        {
+            OSL_ASSERT(false);
+            return;
+        }
+        sal_uInt64 attributes = 0;
+        //Setting the executable attribute does not affect executables on Windows
+        if (getFileAttributes(attributes))
+        {
+            if(getMyBackend()->m_context == "user")
+                attributes |= osl_File_Attribute_OwnExe;
+            else if (getMyBackend()->m_context == "shared")
+                attributes |= (osl_File_Attribute_OwnExe | osl_File_Attribute_GrpExe
+                               | osl_File_Attribute_OthExe);
+            else if (getMyBackend()->m_context != "bundled")
+                //Bundled extensions are required to be in the properly
+                //installed. That is an executable must have the right flags
+                OSL_ASSERT(false);
+
+            //This won't have effect on Windows
+            osl::File::setAttributes(
+                    dp_misc::expandUnoRcUrl(m_url), attributes);
+        }
+        getMyBackend()->addDataToDb(getURL());
+    }
+    else
+    {
+        getMyBackend()->revokeEntryFromDb(getURL());
+    }
+}
+
+//We currently cannot check if this XPackage represents a content of a particular extension
+//But we can check if we are within $UNO_USER_PACKAGES_CACHE etc.
+//Done for security reasons. For example an extension manifest could contain a path to
+//an executable outside the extension.
+bool BackendImpl::ExecutablePackageImpl::isUrlTargetInExtension() const
+{
+    bool bSuccess = false;
+    OUString sExtensionDir;
+    if(getMyBackend()->m_context == "user")
+        sExtensionDir = dp_misc::expandUnoRcTerm("$UNO_USER_PACKAGES_CACHE");
+    else if (getMyBackend()->m_context == "shared")
+        sExtensionDir = dp_misc::expandUnoRcTerm("$UNO_SHARED_PACKAGES_CACHE");
+    else if (getMyBackend()->m_context == "bundled")
+        sExtensionDir = dp_misc::expandUnoRcTerm("$BUNDLED_EXTENSIONS");
+    else
+        OSL_ASSERT(false);
+    //remove file ellipses
+    if (osl::File::E_None == osl::File::getAbsoluteFileURL(OUString(), sExtensionDir, sExtensionDir))
+    {
+        OUString sFile;
+        if (osl::File::E_None == osl::File::getAbsoluteFileURL(
+            OUString(), dp_misc::expandUnoRcUrl(m_url), sFile))
+        {
+            if (sFile.match(sExtensionDir))
+                bSuccess = true;
+        }
+    }
+    return bSuccess;
+}
+
+bool BackendImpl::ExecutablePackageImpl::getFileAttributes(sal_uInt64& out_Attributes)
+{
+    bool bSuccess = false;
+    const OUString url(dp_misc::expandUnoRcUrl(m_url));
+    osl::DirectoryItem item;
+    if (osl::FileBase::E_None == osl::DirectoryItem::get(url, item))
+    {
+        osl::FileStatus aStatus(osl_FileStatus_Mask_Attributes);
+        if( osl::FileBase::E_None == item.getFileStatus(aStatus))
+        {
+            out_Attributes = aStatus.getAttributes();
+            bSuccess = true;
+        }
+    }
+    return bSuccess;
+}
+
+
+} // anon namespace
+
+
+} // namespace dp_registry::backend::executable
+
+extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface*
+com_sun_star_comp_deployment_executable_PackageRegistryBackend_get_implementation(
+    css::uno::XComponentContext* context, css::uno::Sequence<css::uno::Any> const& args)
+{
+    return cppu::acquire(new dp_registry::backend::executable::BackendImpl(args, context));
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/desktop/source/deployment/registry/executable/dp_executablebackenddb.cxx b/desktop/source/deployment/registry/executable/dp_executablebackenddb.cxx
new file mode 100644
index 000000000..29cbf85b3
--- /dev/null
+++ b/desktop/source/deployment/registry/executable/dp_executablebackenddb.cxx
@@ -0,0 +1,64 @@
+/* -*- 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 <com/sun/star/uno/XComponentContext.hpp>
+#include "dp_executablebackenddb.hxx"
+
+
+using namespace ::com::sun::star::uno;
+
+constexpr OUStringLiteral EXTENSION_REG_NS = u"http://openoffice.org/extensionmanager/executable-registry/2010";
+constexpr OUStringLiteral NS_PREFIX = u"exe";
+constexpr OUStringLiteral ROOT_ELEMENT_NAME = u"executable-backend-db";
+constexpr OUStringLiteral ENTRY_NAME = u"executable";
+
+namespace dp_registry::backend::executable {
+
+ExecutableBackendDb::ExecutableBackendDb(
+    Reference<XComponentContext> const &  xContext,
+    OUString const & url):RegisteredDb(xContext, url)
+{
+
+}
+
+OUString ExecutableBackendDb::getDbNSName()
+{
+    return EXTENSION_REG_NS;
+}
+
+OUString ExecutableBackendDb::getNSPrefix()
+{
+    return NS_PREFIX;
+}
+
+OUString ExecutableBackendDb::getRootElementName()
+{
+    return ROOT_ELEMENT_NAME;
+}
+
+OUString ExecutableBackendDb::getKeyElementName()
+{
+    return ENTRY_NAME;
+}
+
+
+} // namespace dp_registry::backend::executable
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/desktop/source/deployment/registry/executable/dp_executablebackenddb.hxx b/desktop/source/deployment/registry/executable/dp_executablebackenddb.hxx
new file mode 100644
index 000000000..0561a8c54
--- /dev/null
+++ b/desktop/source/deployment/registry/executable/dp_executablebackenddb.hxx
@@ -0,0 +1,55 @@
+/* -*- 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 .
+ */
+
+#pragma once
+
+#include <rtl/ustring.hxx>
+#include <dp_backenddb.hxx>
+
+namespace com::sun::star::uno
+{
+class XComponentContext;
+}
+
+namespace dp_registry::backend::executable
+{
+/* The XML file stores the extensions which are currently registered.
+   They will be removed when they are revoked.
+   The format looks like this:
+
+<?xml version="1.0"?>
+ */
+class ExecutableBackendDb : public dp_registry::backend::RegisteredDb
+{
+protected:
+    virtual OUString getDbNSName() override;
+
+    virtual OUString getNSPrefix() override;
+
+    virtual OUString getRootElementName() override;
+
+    virtual OUString getKeyElementName() override;
+
+public:
+    ExecutableBackendDb(css::uno::Reference<css::uno::XComponentContext> const& xContext,
+                        OUString const& url);
+};
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/desktop/source/deployment/registry/help/README.md b/desktop/source/deployment/registry/help/README.md
new file mode 100644
index 000000000..24ea19518
--- /dev/null
+++ b/desktop/source/deployment/registry/help/README.md
@@ -0,0 +1 @@
+Support for help integrated in extensions. Also see /README.help.md.
diff --git a/desktop/source/deployment/registry/help/dp_help.cxx b/desktop/source/deployment/registry/help/dp_help.cxx
new file mode 100644
index 000000000..9e1a75fb9
--- /dev/null
+++ b/desktop/source/deployment/registry/help/dp_help.cxx
@@ -0,0 +1,621 @@
+/* -*- 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 <memory>
+#include <config_features.h>
+
+#include <strings.hrc>
+#include <dp_backend.h>
+#include <dp_misc.h>
+#include "dp_helpbackenddb.hxx"
+#include <dp_ucb.h>
+#include <rtl/uri.hxx>
+#include <osl/file.hxx>
+#include <ucbhelper/content.hxx>
+#include <svl/inettype.hxx>
+#include <unotools/pathoptions.hxx>
+#include <cppuhelper/supportsservice.hxx>
+#include <o3tl/string_view.hxx>
+
+#if HAVE_FEATURE_XMLHELP
+#include <helpcompiler/compilehelp.hxx>
+#include <helpcompiler/HelpIndexer.hxx>
+#endif
+#include <com/sun/star/deployment/DeploymentException.hpp>
+#include <com/sun/star/deployment/ExtensionRemovedException.hpp>
+#include <com/sun/star/ucb/SimpleFileAccess.hpp>
+#include <com/sun/star/util/XMacroExpander.hpp>
+#include <optional>
+#include <string_view>
+
+using namespace ::dp_misc;
+using namespace ::com::sun::star;
+using namespace ::com::sun::star::uno;
+using namespace ::com::sun::star::ucb;
+
+namespace dp_registry::backend::help {
+namespace {
+
+
+class BackendImpl : public ::dp_registry::backend::PackageRegistryBackend
+{
+    class PackageImpl : public ::dp_registry::backend::Package
+    {
+        BackendImpl * getMyBackend() const;
+
+        // Package
+        virtual beans::Optional< beans::Ambiguous<sal_Bool> > isRegistered_(
+            ::osl::ResettableMutexGuard & guard,
+            ::rtl::Reference<AbortChannel> const & abortChannel,
+            Reference<XCommandEnvironment> const & xCmdEnv ) override;
+        virtual void processPackage_(
+            ::osl::ResettableMutexGuard & guard,
+            bool registerPackage,
+            bool startup,
+            ::rtl::Reference<AbortChannel> const & abortChannel,
+            Reference<XCommandEnvironment> const & xCmdEnv ) override;
+
+
+    public:
+        PackageImpl(
+            ::rtl::Reference<PackageRegistryBackend> const & myBackend,
+            OUString const & url, OUString const & name,
+            Reference<deployment::XPackageTypeInfo> const & xPackageType,
+            bool bRemoved, OUString const & identifier);
+
+        bool extensionContainsCompiledHelp();
+
+        //XPackage
+        virtual css::beans::Optional< OUString > SAL_CALL getRegistrationDataURL() override;
+    };
+    friend class PackageImpl;
+
+    // PackageRegistryBackend
+    virtual Reference<deployment::XPackage> bindPackage_(
+        OUString const & url, OUString const & mediaType,
+        bool bRemoved, OUString const & identifier,
+        Reference<XCommandEnvironment> const & xCmdEnv ) override;
+
+    void implProcessHelp( PackageImpl * package, bool doRegisterPackage,
+                          Reference<ucb::XCommandEnvironment> const & xCmdEnv);
+    void implCollectXhpFiles( const OUString& aDir,
+        std::vector< OUString >& o_rXhpFileVector );
+
+    ::std::optional<HelpBackendDb::Data> readDataFromDb(std::u16string_view url);
+    bool hasActiveEntry(std::u16string_view url);
+    bool activateEntry(std::u16string_view url);
+
+    Reference< ucb::XSimpleFileAccess3 > const & getFileAccess();
+    Reference< ucb::XSimpleFileAccess3 > m_xSFA;
+
+    const Reference<deployment::XPackageTypeInfo> m_xHelpTypeInfo;
+    Sequence< Reference<deployment::XPackageTypeInfo> > m_typeInfos;
+    std::unique_ptr<HelpBackendDb> m_backendDb;
+
+public:
+    BackendImpl( Sequence<Any> const & args,
+                 Reference<XComponentContext> const & xComponentContext );
+
+    // XServiceInfo
+    virtual OUString SAL_CALL getImplementationName() override;
+    virtual sal_Bool SAL_CALL supportsService( const OUString& ServiceName ) override;
+    virtual css::uno::Sequence< OUString > SAL_CALL getSupportedServiceNames() override;
+
+    // XPackageRegistry
+    virtual Sequence< Reference<deployment::XPackageTypeInfo> > SAL_CALL
+        getSupportedPackageTypes() override;
+    virtual void SAL_CALL packageRemoved(OUString const & url, OUString const & mediaType) override;
+
+};
+
+
+BackendImpl::BackendImpl(
+    Sequence<Any> const & args,
+    Reference<XComponentContext> const & xComponentContext )
+    : PackageRegistryBackend( args, xComponentContext ),
+      m_xHelpTypeInfo( new Package::TypeInfo("application/vnd.sun.star.help",
+                               OUString(),
+                               DpResId(RID_STR_HELP)
+                               ) ),
+      m_typeInfos{ m_xHelpTypeInfo }
+{
+    if (transientMode())
+        return;
+
+    OUString dbFile = makeURL(getCachePath(), "backenddb.xml");
+    m_backendDb.reset(
+        new HelpBackendDb(getComponentContext(), dbFile));
+
+    //clean up data folders which are no longer used.
+    //This must not be done in the same process where the help files
+    //are still registers. Only after revoking and restarting OOo the folders
+    //can be removed. This works now, because the extension manager is a singleton
+    //and the backends are only create once per process.
+    std::vector<OUString> folders = m_backendDb->getAllDataUrls();
+    deleteUnusedFolders(folders);
+}
+
+// XServiceInfo
+OUString BackendImpl::getImplementationName()
+{
+    return "com.sun.star.comp.deployment.help.PackageRegistryBackend";
+}
+
+sal_Bool BackendImpl::supportsService( const OUString& ServiceName )
+{
+    return cppu::supportsService(this, ServiceName);
+}
+
+css::uno::Sequence< OUString > BackendImpl::getSupportedServiceNames()
+{
+    return { BACKEND_SERVICE_NAME };
+}
+
+// XPackageRegistry
+
+Sequence< Reference<deployment::XPackageTypeInfo> >
+BackendImpl::getSupportedPackageTypes()
+{
+    return m_typeInfos;
+}
+
+void BackendImpl::packageRemoved(OUString const & url, OUString const & /*mediaType*/)
+{
+    if (m_backendDb)
+        m_backendDb->removeEntry(url);
+}
+
+// PackageRegistryBackend
+
+Reference<deployment::XPackage> BackendImpl::bindPackage_(
+    OUString const & url, OUString const & mediaType_,
+    bool bRemoved, OUString const & identifier,
+    Reference<XCommandEnvironment> const & xCmdEnv )
+{
+    // we don't support auto detection:
+    if (mediaType_.isEmpty())
+        throw lang::IllegalArgumentException(
+            StrCannotDetectMediaType() + url,
+            static_cast<OWeakObject *>(this), static_cast<sal_Int16>(-1) );
+
+    OUString type, subType;
+    INetContentTypeParameterList params;
+    if (INetContentTypes::parse( mediaType_, type, subType, &params ))
+    {
+        if (type.equalsIgnoreAsciiCase("application"))
+        {
+            OUString name;
+            if (!bRemoved)
+            {
+                ::ucbhelper::Content ucbContent(
+                    url, xCmdEnv, getComponentContext() );
+                name = StrTitle::getTitle( ucbContent );
+            }
+
+            if (subType.equalsIgnoreAsciiCase( "vnd.sun.star.help"))
+            {
+                return new PackageImpl(
+                    this, url, name, m_xHelpTypeInfo, bRemoved,
+                    identifier);
+            }
+        }
+    }
+    throw lang::IllegalArgumentException(
+        StrUnsupportedMediaType() + mediaType_,
+        static_cast<OWeakObject *>(this),
+        static_cast<sal_Int16>(-1) );
+}
+
+::std::optional<HelpBackendDb::Data> BackendImpl::readDataFromDb(
+    std::u16string_view url)
+{
+    ::std::optional<HelpBackendDb::Data> data;
+    if (m_backendDb)
+        data = m_backendDb->getEntry(url);
+    return data;
+}
+
+bool BackendImpl::hasActiveEntry(std::u16string_view url)
+{
+    if (m_backendDb)
+        return m_backendDb->hasActiveEntry(url);
+    return false;
+}
+
+bool BackendImpl::activateEntry(std::u16string_view url)
+{
+    if (m_backendDb)
+        return m_backendDb->activateEntry(url);
+    return false;
+}
+
+
+BackendImpl::PackageImpl::PackageImpl(
+    ::rtl::Reference<PackageRegistryBackend> const & myBackend,
+    OUString const & url, OUString const & name,
+    Reference<deployment::XPackageTypeInfo> const & xPackageType,
+    bool bRemoved, OUString const & identifier)
+    : Package( myBackend, url, name, name, xPackageType, bRemoved,
+               identifier)
+{
+}
+
+// Package
+BackendImpl * BackendImpl::PackageImpl::getMyBackend() const
+{
+    BackendImpl * pBackend = static_cast<BackendImpl *>(m_myBackend.get());
+    if (nullptr == pBackend)
+    {
+        //May throw a DisposedException
+        check();
+        //We should never get here...
+        throw RuntimeException("Failed to get the BackendImpl",
+            static_cast<OWeakObject*>(const_cast<PackageImpl *>(this)));
+    }
+    return pBackend;
+}
+
+bool BackendImpl::PackageImpl::extensionContainsCompiledHelp()
+{
+    bool bCompiled = true;
+    OUString aExpandedHelpURL = dp_misc::expandUnoRcUrl(getURL());
+
+    ::osl::Directory helpFolder(aExpandedHelpURL);
+    if ( helpFolder.open() == ::osl::File::E_None)
+    {
+        //iterate over the contents of the help folder
+        //We assume that all folders within the help folder contain language specific
+        //help files. If just one of them does not contain compiled help then this
+        //function returns false.
+        ::osl::DirectoryItem item;
+        ::osl::File::RC errorNext = ::osl::File::E_None;
+        while ((errorNext = helpFolder.getNextItem(item)) == ::osl::File::E_None)
+        {
+            //No find the language folders
+            ::osl::FileStatus stat(osl_FileStatus_Mask_Type | osl_FileStatus_Mask_FileName |osl_FileStatus_Mask_FileURL);
+            if (item.getFileStatus(stat) == ::osl::File::E_None)
+            {
+                if (stat.getFileType() != ::osl::FileStatus::Directory)
+                    continue;
+
+                //look if there is the folder help.idxl in the language folder
+                OUString compUrl(stat.getFileURL() + "/help.idxl");
+                ::osl::Directory compiledFolder(compUrl);
+                if (compiledFolder.open() != ::osl::File::E_None)
+                {
+                    bCompiled = false;
+                    break;
+                }
+            }
+            else
+            {
+                //Error
+                OSL_ASSERT(false);
+                bCompiled = false;
+                break;
+            }
+        }
+        if (errorNext != ::osl::File::E_NOENT
+            && errorNext != ::osl::File::E_None)
+        {
+            //Error
+            OSL_ASSERT(false);
+            bCompiled = false;
+        }
+    }
+    return bCompiled;
+}
+
+
+beans::Optional< beans::Ambiguous<sal_Bool> >
+BackendImpl::PackageImpl::isRegistered_(
+    ::osl::ResettableMutexGuard &,
+    ::rtl::Reference<AbortChannel> const &,
+    Reference<XCommandEnvironment> const & )
+{
+    BackendImpl * that = getMyBackend();
+
+    bool bReg = false;
+    if (that->hasActiveEntry(getURL()))
+        bReg = true;
+
+    return beans::Optional< beans::Ambiguous<sal_Bool> >( true, beans::Ambiguous<sal_Bool>( bReg, false ) );
+}
+
+
+void BackendImpl::PackageImpl::processPackage_(
+    ::osl::ResettableMutexGuard &,
+    bool doRegisterPackage,
+    bool /* startup */,
+    ::rtl::Reference<AbortChannel> const &,
+    Reference<XCommandEnvironment> const & xCmdEnv )
+{
+    BackendImpl* that = getMyBackend();
+    that->implProcessHelp( this, doRegisterPackage, xCmdEnv);
+}
+
+beans::Optional< OUString > BackendImpl::PackageImpl::getRegistrationDataURL()
+{
+    if (m_bRemoved)
+        throw deployment::ExtensionRemovedException();
+
+    ::std::optional<HelpBackendDb::Data> data =
+          getMyBackend()->readDataFromDb(getURL());
+
+    if (data && getMyBackend()->hasActiveEntry(getURL()))
+        return beans::Optional<OUString>(true, data->dataUrl);
+
+    return beans::Optional<OUString>(true, OUString());
+}
+
+void BackendImpl::implProcessHelp(
+    PackageImpl * package, bool doRegisterPackage,
+    Reference<ucb::XCommandEnvironment> const & xCmdEnv)
+{
+    Reference< deployment::XPackage > xPackage(package);
+    OSL_ASSERT(xPackage.is());
+    if (doRegisterPackage)
+    {
+        //revive already processed help if possible
+        if ( !activateEntry(xPackage->getURL()))
+        {
+            HelpBackendDb::Data data;
+            data.dataUrl = xPackage->getURL();
+            if (!package->extensionContainsCompiledHelp())
+            {
+#if HAVE_FEATURE_XMLHELP
+                const OUString sHelpFolder = createFolder(xCmdEnv);
+                data.dataUrl = sHelpFolder;
+
+                Reference< ucb::XSimpleFileAccess3 > xSFA = getFileAccess();
+                OUString aHelpURL = xPackage->getURL();
+                OUString aExpandedHelpURL = dp_misc::expandUnoRcUrl( aHelpURL );
+                if( !xSFA->isFolder( aExpandedHelpURL ) )
+                {
+                    OUString aErrStr = DpResId( RID_STR_HELPPROCESSING_GENERAL_ERROR ) +
+                        "No help folder";
+                    OWeakObject* oWeakThis = this;
+                    throw deployment::DeploymentException( OUString(), oWeakThis,
+                                                           Any( uno::Exception( aErrStr, oWeakThis ) ) );
+                }
+
+                // Scan languages
+                Sequence< OUString > aLanguageFolderSeq = xSFA->getFolderContents( aExpandedHelpURL, true );
+                sal_Int32 nLangCount = aLanguageFolderSeq.getLength();
+                const OUString* pSeq = aLanguageFolderSeq.getConstArray();
+                for( sal_Int32 iLang = 0 ; iLang < nLangCount ; ++iLang )
+                {
+                    OUString aLangURL = pSeq[iLang];
+                    if( xSFA->isFolder( aLangURL ) )
+                    {
+                        std::vector< OUString > aXhpFileVector;
+
+                        // calculate jar file URL
+                        sal_Int32 indexStartSegment = aLangURL.lastIndexOf('/');
+                        // for example "/en"
+                        OUString langFolderURLSegment(
+                            aLangURL.copy(
+                                indexStartSegment + 1, aLangURL.getLength() - indexStartSegment - 1));
+
+                        //create the folder in the "temporary folder"
+                        ::ucbhelper::Content langFolderContent;
+                        const OUString langFolderDest = makeURL(sHelpFolder, langFolderURLSegment);
+                        const OUString langFolderDestExpanded = ::dp_misc::expandUnoRcUrl(langFolderDest);
+                        ::dp_misc::create_folder(
+                            &langFolderContent,
+                            langFolderDest, xCmdEnv);
+
+                        static const OUStringLiteral aHelpStr(u"help");
+
+                        OUString aJarFile(
+                            makeURL(sHelpFolder, langFolderURLSegment + "/" + aHelpStr + ".jar"));
+                        aJarFile = ::dp_misc::expandUnoRcUrl(aJarFile);
+
+                        OUString aEncodedJarFilePath = rtl::Uri::encode(
+                            aJarFile, rtl_UriCharClassPchar,
+                            rtl_UriEncodeIgnoreEscapes,
+                            RTL_TEXTENCODING_UTF8 );
+                        OUString aDestBasePath = "vnd.sun.star.zip://" +
+                            aEncodedJarFilePath + "/" ;
+
+                        sal_Int32 nLenLangFolderURL = aLangURL.getLength() + 1;
+
+                        Sequence< OUString > aSubLangSeq = xSFA->getFolderContents( aLangURL, true );
+                        sal_Int32 nSubLangCount = aSubLangSeq.getLength();
+                        const OUString* pSubLangSeq = aSubLangSeq.getConstArray();
+                        for( sal_Int32 iSubLang = 0 ; iSubLang < nSubLangCount ; ++iSubLang )
+                        {
+                            OUString aSubFolderURL = pSubLangSeq[iSubLang];
+                            if( !xSFA->isFolder( aSubFolderURL ) )
+                                continue;
+
+                            implCollectXhpFiles( aSubFolderURL, aXhpFileVector );
+
+                            // Copy to package (later: move?)
+                            std::u16string_view aPureFolderName = aSubFolderURL.subView( nLenLangFolderURL );
+                            OUString aDestPath = aDestBasePath + aPureFolderName;
+                            xSFA->copy( aSubFolderURL, aDestPath );
+                        }
+
+                        // Call compiler
+                        sal_Int32 nXhpFileCount = aXhpFileVector.size();
+                        std::unique_ptr<OUString[]> pXhpFiles(new OUString[nXhpFileCount]);
+                        for( sal_Int32 iXhp = 0 ; iXhp < nXhpFileCount ; ++iXhp )
+                        {
+                            OUString aXhpFile = aXhpFileVector[iXhp];
+                            OUString aXhpRelFile = aXhpFile.copy( nLenLangFolderURL );
+                            pXhpFiles[iXhp] = aXhpRelFile;
+                        }
+
+                        OUString aOfficeHelpPath( SvtPathOptions().GetHelpPath() );
+                        OUString aOfficeHelpPathFileURL;
+                        ::osl::File::getFileURLFromSystemPath( aOfficeHelpPath, aOfficeHelpPathFileURL );
+
+                        HelpProcessingErrorInfo aErrorInfo;
+                        bool bSuccess = compileExtensionHelp(
+                            aOfficeHelpPathFileURL, aHelpStr, aLangURL,
+                            nXhpFileCount, pXhpFiles.get(),
+                            langFolderDestExpanded, aErrorInfo );
+
+                        pXhpFiles.reset();
+
+                        if( bSuccess )
+                        {
+                            OUString aLang;
+                            sal_Int32 nLastSlash = aLangURL.lastIndexOf( '/' );
+                            if( nLastSlash != -1 )
+                                aLang = aLangURL.copy( nLastSlash + 1 );
+                            else
+                                aLang = "en";
+
+                            HelpIndexer aIndexer(aLang, "help", langFolderDestExpanded, langFolderDestExpanded);
+                            aIndexer.indexDocuments();
+                        }
+
+                        if( !bSuccess )
+                        {
+                            TranslateId pErrStrId;
+                            switch( aErrorInfo.m_eErrorClass )
+                            {
+                            case HelpProcessingErrorClass::General:      pErrStrId = RID_STR_HELPPROCESSING_GENERAL_ERROR; break;
+                            case HelpProcessingErrorClass::XmlParsing:   pErrStrId = RID_STR_HELPPROCESSING_XMLPARSING_ERROR; break;
+                            default: ;
+                            };
+
+                            OUString aErrStr;
+                            if (pErrStrId)
+                            {
+                                aErrStr = DpResId(pErrStrId);
+
+                                // Remove CR/LF
+                                OUString aErrMsg( aErrorInfo.m_aErrorMsg );
+                                sal_Unicode const nCR = 13, nLF = 10;
+                                sal_Int32 nSearchCR = aErrMsg.indexOf( nCR );
+                                sal_Int32 nSearchLF = aErrMsg.indexOf( nLF );
+                                if( nSearchCR != -1 || nSearchLF != -1 )
+                                {
+                                    sal_Int32 nCopy;
+                                    if( nSearchCR == -1 )
+                                        nCopy = nSearchLF;
+                                    else if( nSearchLF == -1 )
+                                        nCopy = nSearchCR;
+                                    else
+                                        nCopy = ( nSearchCR < nSearchLF ) ? nSearchCR : nSearchLF;
+
+                                    aErrMsg = aErrMsg.copy( 0, nCopy );
+                                }
+                                aErrStr += aErrMsg;
+                                if (pErrStrId != RID_STR_HELPPROCESSING_XMLPARSING_ERROR && !aErrorInfo.m_aXMLParsingFile.isEmpty() )
+                                {
+                                    aErrStr += " in ";
+
+                                    OUString aDecodedFile = rtl::Uri::decode( aErrorInfo.m_aXMLParsingFile,
+                                                                                   rtl_UriDecodeWithCharset, RTL_TEXTENCODING_UTF8 );
+                                    aErrStr += aDecodedFile;
+                                    if( aErrorInfo.m_nXMLParsingLine != -1 )
+                                    {
+                                        aErrStr += ", line " +
+                                            OUString::number( aErrorInfo.m_nXMLParsingLine );
+                                    }
+                                }
+                            }
+
+                            OWeakObject* oWeakThis = this;
+                            throw deployment::DeploymentException( OUString(), oWeakThis,
+                                                                   Any( uno::Exception( aErrStr, oWeakThis ) ) );
+                        }
+                    }
+                }
+#else
+                (void) xCmdEnv;
+#endif
+            }
+            // Writing the data entry replaces writing the flag file. If we got to this
+            // point the registration was successful.
+            if (m_backendDb)
+                m_backendDb->addEntry(xPackage->getURL(), data);
+        }
+    } //if (doRegisterPackage)
+    else
+    {
+        if (m_backendDb)
+            m_backendDb->revokeEntry(xPackage->getURL());
+    }
+}
+
+void BackendImpl::implCollectXhpFiles( const OUString& aDir,
+    std::vector< OUString >& o_rXhpFileVector )
+{
+    Reference< ucb::XSimpleFileAccess3 > xSFA = getFileAccess();
+
+    // Scan xhp files recursively
+    Sequence< OUString > aSeq = xSFA->getFolderContents( aDir, true );
+    sal_Int32 nCount = aSeq.getLength();
+    const OUString* pSeq = aSeq.getConstArray();
+    for( sal_Int32 i = 0 ; i < nCount ; ++i )
+    {
+        OUString aURL = pSeq[i];
+        if( xSFA->isFolder( aURL ) )
+        {
+            implCollectXhpFiles( aURL, o_rXhpFileVector );
+        }
+        else
+        {
+            sal_Int32 nLastDot = aURL.lastIndexOf( '.' );
+            if( nLastDot != -1 )
+            {
+                std::u16string_view aExt = aURL.subView( nLastDot + 1 );
+                if( o3tl::equalsIgnoreAsciiCase( aExt, u"xhp" ) )
+                    o_rXhpFileVector.push_back( aURL );
+            }
+        }
+    }
+}
+
+Reference< ucb::XSimpleFileAccess3 > const & BackendImpl::getFileAccess()
+{
+    if( !m_xSFA.is() )
+    {
+        Reference<XComponentContext> const & xContext = getComponentContext();
+        if( xContext.is() )
+        {
+            m_xSFA = ucb::SimpleFileAccess::create(xContext);
+        }
+        if( !m_xSFA.is() )
+        {
+            throw RuntimeException(
+                "dp_registry::backend::help::BackendImpl::getFileAccess(), "
+                "could not instantiate SimpleFileAccess."  );
+        }
+    }
+    return m_xSFA;
+}
+
+} // anon namespace
+
+} // namespace dp_registry
+
+extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface*
+com_sun_star_comp_deployment_help_PackageRegistryBackend_get_implementation(
+    css::uno::XComponentContext* context, css::uno::Sequence<css::uno::Any> const& args)
+{
+    return cppu::acquire(new dp_registry::backend::help::BackendImpl(args, context));
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/desktop/source/deployment/registry/help/dp_helpbackenddb.cxx b/desktop/source/deployment/registry/help/dp_helpbackenddb.cxx
new file mode 100644
index 000000000..19bb3c3ce
--- /dev/null
+++ b/desktop/source/deployment/registry/help/dp_helpbackenddb.cxx
@@ -0,0 +1,126 @@
+/* -*- 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 <cppuhelper/exc_hlp.hxx>
+#include <com/sun/star/deployment/DeploymentException.hpp>
+#include <com/sun/star/uno/XComponentContext.hpp>
+
+#include "dp_helpbackenddb.hxx"
+
+
+using namespace ::com::sun::star::uno;
+
+constexpr OUStringLiteral EXTENSION_REG_NS = u"http://openoffice.org/extensionmanager/help-registry/2010";
+constexpr OUStringLiteral NS_PREFIX = u"help";
+constexpr OUStringLiteral ROOT_ELEMENT_NAME = u"help-backend-db";
+constexpr OUStringLiteral KEY_ELEMENT_NAME = u"help";
+
+namespace dp_registry::backend::help {
+
+HelpBackendDb::HelpBackendDb(
+    Reference<XComponentContext> const &  xContext,
+    OUString const & url):BackendDb(xContext, url)
+{
+
+}
+
+OUString HelpBackendDb::getDbNSName()
+{
+    return EXTENSION_REG_NS;
+}
+
+OUString HelpBackendDb::getNSPrefix()
+{
+    return NS_PREFIX;
+}
+
+OUString HelpBackendDb::getRootElementName()
+{
+    return ROOT_ELEMENT_NAME;
+}
+
+OUString HelpBackendDb::getKeyElementName()
+{
+    return KEY_ELEMENT_NAME;
+}
+
+
+void HelpBackendDb::addEntry(OUString const & url, Data const & data)
+{
+    try{
+        if (!activateEntry(url))
+        {
+            Reference<css::xml::dom::XNode> helpNode
+                = writeKeyElement(url);
+
+            writeSimpleElement(u"data-url", data.dataUrl, helpNode);
+            save();
+        }
+    }
+    catch ( const css::deployment::DeploymentException& )
+    {
+        throw;
+    }
+    catch(const css::uno::Exception &)
+    {
+        Any exc( ::cppu::getCaughtException() );
+        throw css::deployment::DeploymentException(
+            "Extension Manager: failed to write data entry in help backend db: " + m_urlDb, nullptr, exc);
+    }
+}
+
+
+::std::optional<HelpBackendDb::Data>
+HelpBackendDb::getEntry(std::u16string_view url)
+{
+    try
+    {
+        HelpBackendDb::Data retData;
+        Reference<css::xml::dom::XNode> aNode = getKeyElement(url);
+        if (aNode.is())
+        {
+            retData.dataUrl = readSimpleElement(u"data-url", aNode);
+        }
+        else
+        {
+            return ::std::optional<Data>();
+        }
+        return ::std::optional<Data>(retData);
+    }
+    catch ( const css::deployment::DeploymentException& )
+    {
+        throw;
+    }
+    catch(const css::uno::Exception &)
+    {
+        Any exc( ::cppu::getCaughtException() );
+        throw css::deployment::DeploymentException(
+            "Extension Manager: failed to read data entry in help backend db: " + m_urlDb, nullptr, exc);
+    }
+}
+
+std::vector<OUString> HelpBackendDb::getAllDataUrls()
+{
+    return getOneChildFromAllEntries(u"data-url");
+}
+
+} // namespace dp_registry::backend::help
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/desktop/source/deployment/registry/help/dp_helpbackenddb.hxx b/desktop/source/deployment/registry/help/dp_helpbackenddb.hxx
new file mode 100644
index 000000000..a46bd8663
--- /dev/null
+++ b/desktop/source/deployment/registry/help/dp_helpbackenddb.hxx
@@ -0,0 +1,70 @@
+/* -*- 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 .
+ */
+
+#pragma once
+
+#include <rtl/ustring.hxx>
+#include <optional>
+#include <string_view>
+
+#include <dp_backenddb.hxx>
+
+namespace com::sun::star::uno
+{
+class XComponentContext;
+}
+
+namespace dp_registry::backend::help
+{
+/* The XML file stores the extensions which are currently registered.
+   They will be removed when they are revoked.
+ */
+class HelpBackendDb : public dp_registry::backend::BackendDb
+{
+protected:
+    virtual OUString getDbNSName() override;
+
+    virtual OUString getNSPrefix() override;
+
+    virtual OUString getRootElementName() override;
+
+    virtual OUString getKeyElementName() override;
+
+public:
+    struct Data
+    {
+        /* the URL to the folder containing the compiled help files, etc.
+         */
+        OUString dataUrl;
+    };
+
+public:
+    HelpBackendDb(css::uno::Reference<css::uno::XComponentContext> const& xContext,
+                  OUString const& url);
+
+    void addEntry(OUString const& url, Data const& data);
+
+    ::std::optional<Data> getEntry(std::u16string_view url);
+    //must also return the data urls for entries with @active="false". That is,
+    //those are currently revoked.
+    std::vector<OUString> getAllDataUrls();
+};
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/desktop/source/deployment/registry/inc/dp_backend.h b/desktop/source/deployment/registry/inc/dp_backend.h
new file mode 100644
index 000000000..0fe39db45
--- /dev/null
+++ b/desktop/source/deployment/registry/inc/dp_backend.h
@@ -0,0 +1,287 @@
+/* -*- 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 .
+ */
+
+#pragma once
+
+#include <dp_shared.hxx>
+#include <dp_interact.h>
+#include <rtl/ref.hxx>
+#include <cppuhelper/basemutex.hxx>
+#include <cppuhelper/implbase.hxx>
+#include <cppuhelper/compbase.hxx>
+#include <com/sun/star/lang/XEventListener.hpp>
+#include <com/sun/star/lang/XServiceInfo.hpp>
+#include <com/sun/star/deployment/XPackageRegistry.hpp>
+#include <com/sun/star/uno/XComponentContext.hpp>
+#include <unordered_map>
+#include <strings.hrc>
+#include <utility>
+
+namespace dp_registry::backend
+{
+
+class PackageRegistryBackend;
+
+inline constexpr OUStringLiteral BACKEND_SERVICE_NAME  = u"com.sun.star.deployment.PackageRegistryBackend";
+
+typedef ::cppu::WeakComponentImplHelper<
+    css::deployment::XPackage > t_PackageBase;
+
+
+class Package : protected cppu::BaseMutex, public t_PackageBase
+{
+    PackageRegistryBackend * getMyBackend() const;
+    void processPackage_impl(
+        bool registerPackage,
+        bool startup,
+        css::uno::Reference<css::task::XAbortChannel> const & xAbortChannel,
+        css::uno::Reference<css::ucb::XCommandEnvironment> const & xCmdEnv );
+
+protected:
+    ::rtl::Reference<PackageRegistryBackend> m_myBackend;
+    const OUString m_url;
+    OUString m_name;
+    OUString m_displayName;
+    const css::uno::Reference<css::deployment::XPackageTypeInfo> m_xPackageType;
+    const bool m_bRemoved;
+    //Only set if m_bRemoved = true;
+    const OUString m_identifier;
+
+    void check() const;
+    void fireModified();
+    virtual void SAL_CALL disposing() override;
+
+    void checkAborted(
+        ::rtl::Reference< ::dp_misc::AbortChannel > const & abortChannel );
+
+    // @@@ to be implemented by specific backend:
+    virtual css::beans::Optional< css::beans::Ambiguous<sal_Bool> >
+    isRegistered_(
+        ::osl::ResettableMutexGuard & guard,
+        ::rtl::Reference< ::dp_misc::AbortChannel > const & abortChannel,
+        css::uno::Reference<css::ucb::XCommandEnvironment> const & xCmdEnv )
+        = 0;
+    virtual void processPackage_(
+        ::osl::ResettableMutexGuard & guard,
+        bool registerPackage,
+        bool startup,
+        ::rtl::Reference< ::dp_misc::AbortChannel > const & abortChannel,
+        css::uno::Reference<css::ucb::XCommandEnvironment> const & xCmdEnv )
+        = 0;
+
+    virtual ~Package() override;
+    Package( ::rtl::Reference<PackageRegistryBackend> myBackend,
+             OUString url,
+             OUString name,
+             OUString displayName,
+             css::uno::Reference<css::deployment::XPackageTypeInfo> const & xPackageType,
+             bool bRemoved,
+             OUString identifier);
+
+public:
+
+    class TypeInfo :
+        public ::cppu::WeakImplHelper<css::deployment::XPackageTypeInfo>
+    {
+        const OUString m_mediaType;
+        const OUString m_fileFilter;
+        const OUString m_shortDescr;
+    public:
+        virtual ~TypeInfo() override;
+        TypeInfo( OUString mediaType,
+                  OUString fileFilter,
+                  OUString shortDescr )
+            : m_mediaType(std::move(mediaType)), m_fileFilter(std::move(fileFilter)),
+              m_shortDescr(std::move(shortDescr))
+            {}
+        // XPackageTypeInfo
+        virtual OUString SAL_CALL getMediaType() override;
+        virtual OUString SAL_CALL getDescription() override;
+        virtual OUString SAL_CALL getShortDescription() override;
+        virtual OUString SAL_CALL getFileFilter() override;
+        virtual css::uno::Any SAL_CALL getIcon( sal_Bool highContrast,
+                                                sal_Bool smallIcon ) override;
+    };
+
+    // XComponent
+    virtual void SAL_CALL dispose() override;
+    virtual void SAL_CALL addEventListener(
+        css::uno::Reference<css::lang::XEventListener> const & xListener ) override;
+    virtual void SAL_CALL removeEventListener(
+        css::uno::Reference<css::lang::XEventListener> const & xListener ) override;
+
+    // XModifyBroadcaster
+    virtual void SAL_CALL addModifyListener(
+        css::uno::Reference<css::util::XModifyListener> const & xListener ) override;
+    virtual void SAL_CALL removeModifyListener(
+        css::uno::Reference<css::util::XModifyListener> const & xListener ) override;
+
+    // XPackage
+    virtual css::uno::Reference<css::task::XAbortChannel> SAL_CALL
+    createAbortChannel() override;
+    virtual css::beans::Optional< css::beans::Ambiguous<sal_Bool> >
+    SAL_CALL isRegistered(
+        css::uno::Reference<css::task::XAbortChannel> const & xAbortChannel,
+        css::uno::Reference<css::ucb::XCommandEnvironment> const & xCmdEnv ) override;
+
+    virtual ::sal_Int32 SAL_CALL checkPrerequisites(
+        const css::uno::Reference< css::task::XAbortChannel >& xAbortChannel,
+        const css::uno::Reference< css::ucb::XCommandEnvironment >& xCmdEnv,
+        sal_Bool noLicenseChecking) override;
+
+    virtual ::sal_Bool SAL_CALL checkDependencies(
+        const css::uno::Reference< css::ucb::XCommandEnvironment >& xCmdEnv ) override;
+
+    virtual void SAL_CALL registerPackage(
+        sal_Bool startup,
+        css::uno::Reference<css::task::XAbortChannel> const & xAbortChannel,
+        css::uno::Reference<css::ucb::XCommandEnvironment> const & xCmdEnv ) override;
+    virtual void SAL_CALL revokePackage(
+        sal_Bool startup,
+        css::uno::Reference<css::task::XAbortChannel> const & xAbortChannel,
+        css::uno::Reference<css::ucb::XCommandEnvironment> const & xCmdEnv ) override;
+    virtual sal_Bool SAL_CALL isBundle() override;
+    virtual css::uno::Sequence< css::uno::Reference<css::deployment::XPackage> >
+    SAL_CALL getBundle(
+        css::uno::Reference<css::task::XAbortChannel> const & xAbortChannel,
+        css::uno::Reference<css::ucb::XCommandEnvironment> const & xCmdEnv ) override;
+    virtual OUString SAL_CALL getName() override;
+    virtual css::beans::Optional< OUString > SAL_CALL getIdentifier() override;
+    virtual OUString SAL_CALL getVersion() override;
+    virtual OUString SAL_CALL getURL() override;
+    virtual OUString SAL_CALL getDisplayName() override;
+    virtual OUString SAL_CALL getDescription() override;
+    virtual OUString SAL_CALL getLicenseText() override;
+    virtual css::uno::Sequence< OUString > SAL_CALL
+    getUpdateInformationURLs() override;
+    virtual css::beans::StringPair SAL_CALL getPublisherInfo() override;
+    virtual css::uno::Reference< css::graphic::XGraphic > SAL_CALL
+    getIcon( sal_Bool bHighContrast ) override;
+    virtual css::uno::Reference<css::deployment::XPackageTypeInfo> SAL_CALL
+    getPackageType() override;
+    virtual void SAL_CALL exportTo(
+        OUString const & destFolderURL,
+        OUString const & newTitle,
+        sal_Int32 nameClashAction,
+        css::uno::Reference<css::ucb::XCommandEnvironment> const & xCmdEnv ) override;
+    virtual OUString SAL_CALL getRepositoryName() override;
+    virtual css::beans::Optional< OUString > SAL_CALL getRegistrationDataURL() override;
+    virtual sal_Bool SAL_CALL isRemoved() override;
+
+};
+
+typedef ::cppu::WeakComponentImplHelper<
+    css::lang::XEventListener,
+    css::deployment::XPackageRegistry,
+    css::lang::XServiceInfo > t_BackendBase;
+
+
+class PackageRegistryBackend
+    : protected cppu::BaseMutex, public t_BackendBase
+{
+    //The map held originally WeakReferences. The map entries are removed in the disposing
+    //function, which is called when the XPackages are destructed or they are
+    //explicitly disposed. The latter happens, for example, when an extension is
+    //removed (see dp_manager.cxx). However, because of how the help systems work, now
+    // XPackageManager::getDeployedPackages is called often. This results in a lot
+    //of bindPackage calls which are costly. Therefore we keep hard references in
+    //the map now.
+    typedef std::unordered_map<
+        OUString, css::uno::Reference<css::deployment::XPackage> > t_string2ref;
+    t_string2ref m_bound;
+
+protected:
+    OUString m_cachePath;
+    css::uno::Reference<css::uno::XComponentContext> m_xComponentContext;
+
+    OUString m_context;
+    // currently only for library containers:
+    enum class Context {
+        Unknown, User, Shared, Bundled, Tmp, Document
+    } m_eContext;
+
+    static OUString StrCannotDetectMediaType() { return DpResId(RID_STR_CANNOT_DETECT_MEDIA_TYPE); }
+    static OUString StrUnsupportedMediaType() { return DpResId(RID_STR_UNSUPPORTED_MEDIA_TYPE); }
+
+    // @@@ to be implemented by specific backend:
+    virtual css::uno::Reference<css::deployment::XPackage> bindPackage_(
+        OUString const & url, OUString const & mediaType,
+        bool bRemoved, OUString const & identifier,
+        css::uno::Reference<css::ucb::XCommandEnvironment> const & xCmdEnv )
+        = 0;
+
+    void check();
+    virtual void SAL_CALL disposing() override;
+
+    virtual ~PackageRegistryBackend() override;
+    PackageRegistryBackend(
+        css::uno::Sequence<css::uno::Any> const & args,
+        css::uno::Reference<css::uno::XComponentContext> const & xContext );
+
+    /* creates a folder with a unique name.
+       If url is empty then it is created in the backend folder, otherwise
+       at a location relative to that folder specified by url.
+    */
+    OUString createFolder(
+        css::uno::Reference<css::ucb::XCommandEnvironment> const & xCmdEnv);
+    /* deletes folders and files.
+
+       All folder all files which end with ".tmp" or ".tmp_" and which are
+       not used are deleted.
+     */
+    void deleteUnusedFolders(
+        std::vector< OUString> const & usedFolders);
+    /* deletes one folder with a "temporary" name and the corresponding
+       tmp file, which was used to derive the folder name.
+    */
+    static void deleteTempFolder(
+        OUString const & folderUrl);
+
+public:
+    static OUString StrRegisteringPackage() { return DpResId(RID_STR_REGISTERING_PACKAGE); }
+    static OUString StrRevokingPackage() { return DpResId(RID_STR_REVOKING_PACKAGE); }
+
+    css::uno::Reference<css::uno::XComponentContext> const &
+    getComponentContext() const { return m_xComponentContext; }
+
+    OUString const & getCachePath() const { return m_cachePath; }
+    bool transientMode() const { return m_cachePath.isEmpty(); }
+
+    const OUString& getContext() const {return m_context; }
+
+    // XEventListener
+    virtual void SAL_CALL disposing( css::lang::EventObject const & evt ) override;
+
+    // XPackageRegistry
+    virtual css::uno::Reference<css::deployment::XPackage> SAL_CALL bindPackage(
+        OUString const & url, OUString const & mediaType,
+        sal_Bool bRemoved, OUString const & identifier,
+        css::uno::Reference<css::ucb::XCommandEnvironment> const & xCmdEnv ) override;
+
+//     virtual void SAL_CALL packageRemoved(
+//         OUString const & url, OUString const & mediaType)
+//         throw (css::deployment::DeploymentException,
+//                css::uno::RuntimeException);
+
+};
+
+}
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/desktop/source/deployment/registry/inc/dp_backenddb.hxx b/desktop/source/deployment/registry/inc/dp_backenddb.hxx
new file mode 100644
index 000000000..785201466
--- /dev/null
+++ b/desktop/source/deployment/registry/inc/dp_backenddb.hxx
@@ -0,0 +1,165 @@
+/* -*- 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 .
+ */
+
+#pragma once
+
+#include <com/sun/star/uno/Reference.hxx>
+#include <rtl/ustring.hxx>
+#include <deque>
+#include <string_view>
+#include <vector>
+
+namespace com::sun::star {
+        namespace uno {
+            class XComponentContext;
+        }
+        namespace xml::dom {
+            class XDocument;
+            class XNode;
+        }
+        namespace xml::xpath {
+            class XXPathAPI;
+        }
+}
+
+namespace dp_registry::backend {
+
+class BackendDb
+{
+private:
+
+    css::uno::Reference<css::xml::dom::XDocument> m_doc;
+    css::uno::Reference<css::xml::xpath::XXPathAPI> m_xpathApi;
+
+    BackendDb(BackendDb const &) = delete;
+    BackendDb &  operator = (BackendDb const &) = delete;
+
+protected:
+    const css::uno::Reference<css::uno::XComponentContext> m_xContext;
+    OUString m_urlDb;
+
+protected:
+
+    /* caller must make sure that only one thread accesses the function
+     */
+    css::uno::Reference<css::xml::dom::XDocument> const & getDocument();
+
+    /* the namespace prefix is "reg" (without quotes)
+     */
+    css::uno::Reference<css::xml::xpath::XXPathAPI> const & getXPathAPI();
+    void save();
+    void removeElement(OUString const & sXPathExpression);
+
+    css::uno::Reference<css::xml::dom::XNode> getKeyElement(
+        std::u16string_view url);
+
+    void writeSimpleList(
+        std::deque< OUString> const & list,
+        std::u16string_view sListTagName,
+        std::u16string_view sMemberTagName,
+        css::uno::Reference<css::xml::dom::XNode> const & xParent);
+
+    void writeVectorOfPair(
+        std::vector< std::pair< OUString, OUString > > const & vecPairs,
+        std::u16string_view sVectorTagName,
+        std::u16string_view sPairTagName,
+        std::u16string_view sFirstTagName,
+        std::u16string_view sSecondTagName,
+        css::uno::Reference<css::xml::dom::XNode> const & xParent);
+
+    void writeSimpleElement(
+        std::u16string_view sElementName, OUString const & value,
+        css::uno::Reference<css::xml::dom::XNode> const & xParent);
+
+    css::uno::Reference<css::xml::dom::XNode> writeKeyElement(
+        OUString const & url);
+
+    OUString readSimpleElement(
+        std::u16string_view sElementName,
+        css::uno::Reference<css::xml::dom::XNode> const & xParent);
+
+    std::vector< std::pair< OUString, OUString > >
+    readVectorOfPair(
+        css::uno::Reference<css::xml::dom::XNode> const & parent,
+        std::u16string_view sListTagName,
+        std::u16string_view sPairTagName,
+        std::u16string_view sFirstTagName,
+        std::u16string_view sSecondTagName);
+
+    std::deque< OUString> readList(
+        css::uno::Reference<css::xml::dom::XNode> const & parent,
+        std::u16string_view sListTagName,
+        std::u16string_view sMemberTagName);
+
+    /* returns the values of one particularly child element of all key elements.
+     */
+    std::vector< OUString> getOneChildFromAllEntries(
+        std::u16string_view sElementName);
+
+
+    /*  returns the namespace which is to be written as xmlns attribute
+        into the root element.
+     */
+    virtual OUString getDbNSName()=0;
+    /* return the namespace prefix which is to be registered with the XPath API.
+
+       The prefix can then be used in XPath expressions.
+    */
+    virtual OUString getNSPrefix()=0;
+    /* returns the name of the root element without any namespace prefix.
+     */
+    virtual OUString getRootElementName()=0;
+    /* returns the name of xml element for each entry
+     */
+    virtual OUString getKeyElementName()=0;
+
+public:
+    BackendDb(css::uno::Reference<css::uno::XComponentContext> const &  xContext,
+              OUString const & url);
+    virtual ~BackendDb() {};
+
+    void removeEntry(std::u16string_view url);
+
+    /* This is called to write the "revoked" attribute to the entry.
+       This is done when XPackage::revokePackage is called.
+    */
+    void revokeEntry(std::u16string_view url);
+
+    /* returns false if the entry does not exist yet.
+     */
+    bool activateEntry(std::u16string_view url);
+
+    bool hasActiveEntry(std::u16string_view url);
+
+};
+
+class RegisteredDb: public BackendDb
+{
+
+public:
+    RegisteredDb( css::uno::Reference<css::uno::XComponentContext> const &  xContext,
+                  OUString const & url);
+
+
+    void addEntry(OUString const & url);
+};
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/desktop/source/deployment/registry/package/dp_extbackenddb.cxx b/desktop/source/deployment/registry/package/dp_extbackenddb.cxx
new file mode 100644
index 000000000..8e656c5d7
--- /dev/null
+++ b/desktop/source/deployment/registry/package/dp_extbackenddb.cxx
@@ -0,0 +1,111 @@
+/* -*- 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 <cppuhelper/exc_hlp.hxx>
+#include <com/sun/star/deployment/DeploymentException.hpp>
+#include <com/sun/star/uno/XComponentContext.hpp>
+
+#include "dp_extbackenddb.hxx"
+
+
+using namespace ::com::sun::star::uno;
+
+constexpr OUStringLiteral EXTENSION_REG_NS = u"http://openoffice.org/extensionmanager/extension-registry/2010";
+constexpr OUStringLiteral NS_PREFIX = u"ext";
+constexpr OUStringLiteral ROOT_ELEMENT_NAME = u"extension-backend-db";
+constexpr OUStringLiteral KEY_ELEMENT_NAME = u"extension";
+
+namespace dp_registry::backend::bundle {
+
+ExtensionBackendDb::ExtensionBackendDb(
+    Reference<XComponentContext> const &  xContext,
+    OUString const & url):BackendDb(xContext, url)
+{
+
+}
+
+OUString ExtensionBackendDb::getDbNSName()
+{
+    return EXTENSION_REG_NS;
+}
+
+OUString ExtensionBackendDb::getNSPrefix()
+{
+    return NS_PREFIX;
+}
+
+OUString ExtensionBackendDb::getRootElementName()
+{
+    return ROOT_ELEMENT_NAME;
+}
+
+OUString ExtensionBackendDb::getKeyElementName()
+{
+    return KEY_ELEMENT_NAME;
+}
+
+void ExtensionBackendDb::addEntry(OUString const & url, Data const & data)
+{
+    try{
+        //reactive revoked entry if possible.
+        if (!activateEntry(url))
+        {
+            Reference<css::xml::dom::XNode> extensionNodeNode = writeKeyElement(url);
+            writeVectorOfPair( data.items, u"extension-items", u"item",
+                u"url", u"media-type", extensionNodeNode);
+            save();
+        }
+    }
+    catch(const css::uno::Exception &)
+    {
+        Any exc( ::cppu::getCaughtException() );
+        throw css::deployment::DeploymentException(
+            "Extension Manager: failed to write data entry in backend db: " +
+            m_urlDb, nullptr, exc);
+    }
+}
+
+ExtensionBackendDb::Data ExtensionBackendDb::getEntry(std::u16string_view url)
+{
+    try
+    {
+        ExtensionBackendDb::Data retData;
+        Reference<css::xml::dom::XNode> aNode = getKeyElement(url);
+
+        if (aNode.is())
+        {
+            retData.items =
+                readVectorOfPair( aNode, u"extension-items", u"item",
+                    u"url", u"media-type");
+        }
+        return retData;
+    }
+    catch(const css::uno::Exception &)
+    {
+        Any exc( ::cppu::getCaughtException() );
+        throw css::deployment::DeploymentException(
+            "Extension Manager: failed to read data entry in backend db: " +
+            m_urlDb, nullptr, exc);
+    }
+}
+
+} // namespace dp_registry::backend::bundle
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/desktop/source/deployment/registry/package/dp_extbackenddb.hxx b/desktop/source/deployment/registry/package/dp_extbackenddb.hxx
new file mode 100644
index 000000000..fb736e6e2
--- /dev/null
+++ b/desktop/source/deployment/registry/package/dp_extbackenddb.hxx
@@ -0,0 +1,69 @@
+/* -*- 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 .
+ */
+
+#pragma once
+
+#include <sal/config.h>
+
+#include <string_view>
+#include <utility>
+#include <vector>
+
+#include <rtl/ustring.hxx>
+
+#include <dp_backenddb.hxx>
+
+namespace com::sun::star::uno
+{
+class XComponentContext;
+}
+
+namespace dp_registry::backend::bundle
+{
+/* The XML file stores the extensions which are currently registered.
+   They will be removed when they are revoked.
+ */
+class ExtensionBackendDb : public dp_registry::backend::BackendDb
+{
+protected:
+    virtual OUString getDbNSName() override;
+    virtual OUString getNSPrefix() override;
+    virtual OUString getRootElementName() override;
+    virtual OUString getKeyElementName() override;
+
+public:
+    struct Data
+    {
+        /* every element consists of a pair of the url to the item (jar,rdb, etc)
+           and the media type
+         */
+        std::vector<std::pair<OUString, OUString>> items;
+    };
+
+public:
+    ExtensionBackendDb(css::uno::Reference<css::uno::XComponentContext> const& xContext,
+                       OUString const& url);
+
+    void addEntry(OUString const& url, Data const& data);
+
+    Data getEntry(std::u16string_view url);
+};
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/desktop/source/deployment/registry/package/dp_package.cxx b/desktop/source/deployment/registry/package/dp_package.cxx
new file mode 100644
index 000000000..36b761b54
--- /dev/null
+++ b/desktop/source/deployment/registry/package/dp_package.cxx
@@ -0,0 +1,1594 @@
+/* -*- 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 <strings.hrc>
+#include <dp_package.hxx>
+#include <dp_backend.h>
+#include <dp_misc.h>
+#include <dp_ucb.h>
+#include <dp_interact.h>
+#include <dp_dependencies.hxx>
+#include <dp_platform.hxx>
+#include <dp_descriptioninfoset.hxx>
+#include <dp_identifier.hxx>
+#include <dp_resource.h>
+#include <rtl/uri.hxx>
+#include <rtl/ustrbuf.hxx>
+#include <sal/log.hxx>
+#include <o3tl/string_view.hxx>
+#include <cppuhelper/exc_hlp.hxx>
+#include <cppuhelper/implbase.hxx>
+#include <cppuhelper/supportsservice.hxx>
+#include <ucbhelper/content.hxx>
+#include <svl/inettype.hxx>
+#include <comphelper/propertyvalue.hxx>
+#include <comphelper/sequence.hxx>
+#include <com/sun/star/lang/WrappedTargetException.hpp>
+#include <com/sun/star/graphic/XGraphic.hpp>
+#include <com/sun/star/graphic/GraphicProvider.hpp>
+#include <com/sun/star/graphic/XGraphicProvider.hpp>
+#include <com/sun/star/io/Pipe.hpp>
+#include <com/sun/star/io/XOutputStream.hpp>
+#include <com/sun/star/io/XInputStream.hpp>
+#include <com/sun/star/task/InteractionClassification.hpp>
+#include <com/sun/star/task/XInteractionApprove.hpp>
+#include <com/sun/star/ucb/CommandAbortedException.hpp>
+#include <com/sun/star/ucb/CommandFailedException.hpp>
+#include <com/sun/star/ucb/ContentCreationException.hpp>
+#include <com/sun/star/ucb/XInteractionReplaceExistingData.hpp>
+#include <com/sun/star/ucb/NameClashResolveRequest.hpp>
+#include <com/sun/star/ucb/XContentAccess.hpp>
+#include <com/sun/star/ucb/NameClash.hpp>
+#include <com/sun/star/ucb/UnsupportedCommandException.hpp>
+#include <com/sun/star/sdbc/XResultSet.hpp>
+#include <com/sun/star/sdbc/XRow.hpp>
+#include <com/sun/star/packages/manifest/ManifestReader.hpp>
+#include <com/sun/star/packages/manifest/ManifestWriter.hpp>
+#include <com/sun/star/deployment/DependencyException.hpp>
+#include <com/sun/star/deployment/DeploymentException.hpp>
+#include <com/sun/star/deployment/ExtensionRemovedException.hpp>
+#include <com/sun/star/deployment/LicenseException.hpp>
+#include <com/sun/star/deployment/PlatformException.hpp>
+#include <com/sun/star/deployment/Prerequisites.hpp>
+#include <optional>
+#include <tools/diagnose_ex.h>
+
+#include <algorithm>
+#include <memory>
+#include <string_view>
+#include <utility>
+#include <vector>
+
+#include "dp_extbackenddb.hxx"
+using namespace ::dp_misc;
+using namespace ::com::sun::star;
+using namespace ::com::sun::star::uno;
+
+
+namespace dp_registry::backend::bundle {
+namespace {
+
+typedef cppu::ImplInheritanceHelper<PackageRegistryBackend> ImplBaseT;
+
+
+class BackendImpl : public ImplBaseT
+{
+    class PackageImpl : public ::dp_registry::backend::Package
+    {
+        BackendImpl * getMyBackend() const;
+        /** contains the old tooltip description for the Extension Manager GUI in OOo v.2.x
+            We keep it for backward compatibility.
+        */
+        OUString m_oldDescription;
+        OUString m_url_expanded;
+        const bool m_legacyBundle;
+        Sequence< Reference<deployment::XPackage> > m_bundle;
+        Sequence< Reference<deployment::XPackage> > * m_pBundle;
+
+        ExtensionBackendDb::Data m_dbData;
+
+        Reference<deployment::XPackage> bindBundleItem(
+            OUString const & url, OUString const & mediaType,
+            bool bRemoved, //that is, using data base information
+            OUString const & identifier,
+            Reference<ucb::XCommandEnvironment> const & xCmdEnv,
+            bool notifyDetectionError = true );
+
+        typedef std::vector< Reference<deployment::XPackage> > t_packagevec;
+        void scanBundle(
+            t_packagevec & bundle,
+            ::rtl::Reference<AbortChannel> const & abortChannel,
+            Reference<ucb::XCommandEnvironment> const & xCmdEnv );
+        void scanLegacyBundle(
+            t_packagevec & bundle,
+            OUString const & url,
+            ::rtl::Reference<AbortChannel> const & abortChannel,
+            Reference<ucb::XCommandEnvironment> const & xCmdEnv,
+            bool skip_registration = false );
+        std::vector<Reference<deployment::XPackage> > getPackagesFromDb(
+            Reference<ucb::XCommandEnvironment> const & xCmdEnv);
+        bool checkPlatform(
+            Reference<ucb::XCommandEnvironment > const &  environment);
+
+        bool checkDependencies(
+            Reference<ucb::XCommandEnvironment > const &
+                environment,
+            DescriptionInfoset const & description);
+            // throws css::uno::RuntimeException,
+            // css::deployment::DeploymentException
+
+        /// @throws deployment::DeploymentException
+        /// @throws ucb::CommandFailedException
+        /// @throws ucb::CommandAbortedException
+        /// @throws RuntimeException
+        bool checkLicense(
+            Reference< ucb::XCommandEnvironment > const & xCmdEnv,
+            DescriptionInfoset const & description, bool bNoLicenseChecking);
+        // @throws DeploymentException
+        OUString getTextFromURL(
+            const Reference< ucb::XCommandEnvironment >& xCmdEnv,
+            const OUString& licenseUrl);
+
+        DescriptionInfoset getDescriptionInfoset() const;
+
+        // Package
+        virtual beans::Optional< beans::Ambiguous<sal_Bool> > isRegistered_(
+            ::osl::ResettableMutexGuard & guard,
+            ::rtl::Reference<AbortChannel> const & abortChannel,
+            Reference<ucb::XCommandEnvironment> const & xCmdEnv ) override;
+        virtual void processPackage_(
+            ::osl::ResettableMutexGuard & guard,
+            bool registerPackage,
+            bool startup,
+            ::rtl::Reference<AbortChannel> const & abortChannel,
+            Reference<ucb::XCommandEnvironment> const & xCmdEnv ) override;
+
+        virtual void SAL_CALL disposing() override;
+
+
+    public:
+        PackageImpl(
+            ::rtl::Reference<PackageRegistryBackend> const & myBackend,
+            OUString const & url,
+            OUString const & name,
+            Reference<deployment::XPackageTypeInfo> const & xPackageType,
+            bool legacyBundle,
+            bool bRemoved,
+            OUString const & identifier);
+
+        // XPackage
+        virtual sal_Bool SAL_CALL isBundle() override;
+
+        virtual Sequence< Reference<deployment::XPackage> > SAL_CALL getBundle(
+            Reference<task::XAbortChannel> const & xAbortChannel,
+            Reference<ucb::XCommandEnvironment> const & xCmdEnv ) override;
+        virtual OUString SAL_CALL getDescription() override;
+
+        virtual OUString SAL_CALL getLicenseText() override;
+
+        virtual void SAL_CALL exportTo(
+            OUString const & destFolderURL, OUString const & newTitle,
+            sal_Int32 nameClashAction,
+            Reference<ucb::XCommandEnvironment> const & xCmdEnv ) override;
+
+        virtual ::sal_Int32 SAL_CALL checkPrerequisites(
+            const Reference< task::XAbortChannel >& xAbortChannel,
+            const Reference< ucb::XCommandEnvironment >& xCmdEnv,
+            sal_Bool noLicenseChecking) override;
+
+        virtual sal_Bool SAL_CALL checkDependencies(
+            const Reference< ucb::XCommandEnvironment >& xCmdEnv ) override;
+
+        virtual beans::Optional<OUString> SAL_CALL getIdentifier() override;
+
+        virtual OUString SAL_CALL getVersion() override;
+
+        virtual Sequence<OUString> SAL_CALL getUpdateInformationURLs() override;
+
+        virtual beans::StringPair SAL_CALL getPublisherInfo() override;
+
+        virtual OUString SAL_CALL getDisplayName() override;
+
+        virtual Reference< graphic::XGraphic > SAL_CALL
+        getIcon( sal_Bool bHighContrast ) override;
+    };
+    friend class PackageImpl;
+
+    Reference<deployment::XPackageRegistry> m_xRootRegistry;
+    const Reference<deployment::XPackageTypeInfo> m_xBundleTypeInfo;
+    const Reference<deployment::XPackageTypeInfo> m_xLegacyBundleTypeInfo;
+    Sequence< Reference<deployment::XPackageTypeInfo> > m_typeInfos;
+
+    std::unique_ptr<ExtensionBackendDb> m_backendDb;
+
+    void addDataToDb(OUString const & url, ExtensionBackendDb::Data const & data);
+    ExtensionBackendDb::Data readDataFromDb(std::u16string_view url);
+    void revokeEntryFromDb(std::u16string_view url);
+
+    // PackageRegistryBackend
+    virtual Reference<deployment::XPackage> bindPackage_(
+        OUString const & url, OUString const & mediaType,
+        bool bRemoved, OUString const & identifier,
+        Reference<ucb::XCommandEnvironment> const & xCmdEnv ) override;
+
+    virtual void SAL_CALL disposing() override;
+
+public:
+    BackendImpl(
+        Sequence<Any> const & args,
+        Reference<XComponentContext> const & xComponentContext,
+        Reference<deployment::XPackageRegistry> const & xRootRegistry );
+
+    // XServiceInfo
+    virtual OUString SAL_CALL getImplementationName() override;
+    virtual sal_Bool SAL_CALL supportsService( OUString const& name ) override;
+    virtual Sequence<OUString> SAL_CALL getSupportedServiceNames() override;
+
+    // XPackageRegistry
+    virtual Sequence< Reference<deployment::XPackageTypeInfo> > SAL_CALL
+    getSupportedPackageTypes() override;
+    virtual void SAL_CALL packageRemoved(OUString const & url, OUString const & mediaType) override;
+
+    using ImplBaseT::disposing;
+};
+
+//Used to find a XPackage with a particular URL
+class XPackage_eq
+{
+    OUString m_URL;
+public:
+    explicit XPackage_eq(OUString s) : m_URL(std::move(s)) {}
+    bool operator() (const Reference<deployment::XPackage> & p) const
+    {
+        return m_URL == p->getURL();
+    }
+};
+
+
+BackendImpl::BackendImpl(
+    Sequence<Any> const & args,
+    Reference<XComponentContext> const & xComponentContext,
+    Reference<deployment::XPackageRegistry> const & xRootRegistry )
+    : ImplBaseT( args, xComponentContext ),
+      m_xRootRegistry( xRootRegistry ),
+      m_xBundleTypeInfo( new Package::TypeInfo(
+                             "application/vnd.sun.star.package-bundle",
+                             "*.oxt;*.uno.pkg",
+                             DpResId(RID_STR_PACKAGE_BUNDLE)
+                             ) ),
+      m_xLegacyBundleTypeInfo( new Package::TypeInfo(
+                                   "application/vnd.sun.star.legacy-package-bundle",
+                                   "*.zip",
+                                   m_xBundleTypeInfo->getShortDescription()
+                                   ) ),
+    m_typeInfos{ m_xBundleTypeInfo, m_xLegacyBundleTypeInfo }
+{
+    if (!transientMode())
+    {
+        OUString dbFile = makeURL(getCachePath(), getImplementationName());
+        dbFile = makeURL(dbFile, "backenddb.xml");
+        m_backendDb.reset(
+            new ExtensionBackendDb(getComponentContext(), dbFile));
+    }
+}
+
+
+void BackendImpl::disposing()
+{
+    m_xRootRegistry.clear();
+    PackageRegistryBackend::disposing();
+}
+
+// XServiceInfo
+OUString BackendImpl::getImplementationName()
+{
+    return "com.sun.star.comp.deployment.bundle.PackageRegistryBackend";
+}
+
+sal_Bool BackendImpl::supportsService(OUString const & ServiceName)
+{
+    return cppu::supportsService(this, ServiceName);
+}
+
+Sequence<OUString> BackendImpl::getSupportedServiceNames()
+{
+    return { OUString(BACKEND_SERVICE_NAME) };
+}
+
+// XPackageRegistry
+
+Sequence< Reference<deployment::XPackageTypeInfo> >
+BackendImpl::getSupportedPackageTypes()
+{
+    return m_typeInfos;
+}
+
+void BackendImpl::packageRemoved(OUString const & url, OUString const & /*mediaType*/)
+{
+    //Notify the backend responsible for processing the different media
+    //types that this extension was removed.
+    ExtensionBackendDb::Data data = readDataFromDb(url);
+    for (auto const& item : data.items)
+    {
+        m_xRootRegistry->packageRemoved(item.first, item.second);
+    }
+
+    if (m_backendDb)
+        m_backendDb->removeEntry(url);
+}
+
+
+// PackageRegistryBackend
+
+Reference<deployment::XPackage> BackendImpl::bindPackage_(
+    OUString const & url, OUString const & mediaType_,
+    bool bRemoved, OUString const & identifier,
+    Reference<ucb::XCommandEnvironment> const & xCmdEnv )
+{
+    OUString mediaType( mediaType_ );
+    if (mediaType.isEmpty())
+    {
+        // detect media-type:
+        ::ucbhelper::Content ucbContent;
+        if (create_ucb_content( &ucbContent, url, xCmdEnv ))
+        {
+            if (ucbContent.isFolder())
+            {
+                //Every .oxt, uno.pkg file must contain a META-INF folder
+                ::ucbhelper::Content metaInfContent;
+                if (create_ucb_content(
+                    &metaInfContent, makeURL( url, "META-INF" ),
+                    xCmdEnv, false /* no throw */ ))
+                {
+                     mediaType = "application/vnd.sun.star.package-bundle";
+                }
+                //No support of legacy bundles, because every folder could be one.
+            }
+            else
+            {
+                const OUString title( StrTitle::getTitle( ucbContent ) );
+                if (title.endsWithIgnoreAsciiCase(".oxt") ||
+                    title.endsWithIgnoreAsciiCase(".uno.pkg"))
+                    mediaType = "application/vnd.sun.star.package-bundle";
+                else if (title.endsWithIgnoreAsciiCase(".zip"))
+                    mediaType = "application/vnd.sun.star.legacy-package-bundle";
+            }
+        }
+        if (mediaType.isEmpty())
+            throw lang::IllegalArgumentException(
+                StrCannotDetectMediaType() + url,
+                static_cast<OWeakObject *>(this), static_cast<sal_Int16>(-1) );
+    }
+
+    OUString type, subType;
+    INetContentTypeParameterList params;
+    if (INetContentTypes::parse( mediaType, type, subType, &params ))
+    {
+        if (type.equalsIgnoreAsciiCase("application"))
+        {
+
+            //In case a XPackage is created for a removed extension, we cannot
+            //obtain the name
+            OUString name;
+            if (!bRemoved)
+            {
+                ::ucbhelper::Content ucbContent(
+                    url, xCmdEnv, getComponentContext() );
+                name = StrTitle::getTitle( ucbContent );
+            }
+            if (subType.equalsIgnoreAsciiCase("vnd.sun.star.package-bundle"))
+            {
+                return new PackageImpl(
+                    this, url, name, m_xBundleTypeInfo, false, bRemoved,
+                    identifier);
+            }
+            else if (subType.equalsIgnoreAsciiCase( "vnd.sun.star.legacy-package-bundle"))
+            {
+                return new PackageImpl(
+                    this, url, name, m_xLegacyBundleTypeInfo, true, bRemoved,
+                    identifier);
+            }
+        }
+    }
+    throw lang::IllegalArgumentException(
+        StrUnsupportedMediaType() + mediaType,
+        static_cast<OWeakObject *>(this),
+        static_cast<sal_Int16>(-1) );
+}
+
+void BackendImpl::addDataToDb(
+    OUString const & url, ExtensionBackendDb::Data const & data)
+{
+    if (m_backendDb)
+        m_backendDb->addEntry(url, data);
+}
+
+ExtensionBackendDb::Data BackendImpl::readDataFromDb(
+    std::u16string_view url)
+{
+    ExtensionBackendDb::Data data;
+    if (m_backendDb)
+        data = m_backendDb->getEntry(url);
+    return data;
+}
+
+void BackendImpl::revokeEntryFromDb(std::u16string_view url)
+{
+    if (m_backendDb)
+        m_backendDb->revokeEntry(url);
+}
+
+
+BackendImpl::PackageImpl::PackageImpl(
+    ::rtl::Reference<PackageRegistryBackend> const & myBackend,
+    OUString const & url,
+    OUString const & name,
+    Reference<deployment::XPackageTypeInfo> const & xPackageType,
+    bool legacyBundle, bool bRemoved, OUString const & identifier)
+    : Package( myBackend, url, name, name /* display-name */,
+               xPackageType, bRemoved, identifier),
+      m_url_expanded( expandUnoRcUrl( url ) ),
+      m_legacyBundle( legacyBundle ),
+      m_pBundle( nullptr )
+{
+    if (bRemoved)
+        m_dbData = getMyBackend()->readDataFromDb(url);
+}
+
+BackendImpl * BackendImpl::PackageImpl::getMyBackend() const
+{
+    BackendImpl * pBackend = static_cast<BackendImpl *>(m_myBackend.get());
+    if (nullptr == pBackend)
+    {
+        //May throw a DisposedException
+        check();
+        //We should never get here...
+        throw RuntimeException("Failed to get the BackendImpl",
+            static_cast<OWeakObject*>(const_cast<PackageImpl *>(this)));
+    }
+    return pBackend;
+}
+
+void BackendImpl::PackageImpl::disposing()
+{
+    sal_Int32 len = m_bundle.getLength();
+    Reference<deployment::XPackage> const * p = m_bundle.getConstArray();
+    for ( sal_Int32 pos = 0; pos < len; ++pos )
+        try_dispose( p[ pos ] );
+    m_bundle.realloc( 0 );
+
+    Package::disposing();
+}
+
+// Package
+
+beans::Optional< beans::Ambiguous<sal_Bool> >
+BackendImpl::PackageImpl::isRegistered_(
+    ::osl::ResettableMutexGuard &,
+    ::rtl::Reference<AbortChannel> const & abortChannel,
+    Reference<ucb::XCommandEnvironment> const & xCmdEnv )
+{
+    //In case the object was created for a removed extension (m_bRemoved = true)
+    //but the extension is not registered, then bundle will be empty. Then
+    //the return value will be Optional<...>.IsPresent= false. Although this is
+    //not true, this does not matter. Then registerPackage or revokePackage
+    //would never be called for the items. But since the extension is removed
+    //and not registered anyway, this does not matter.
+    const Sequence< Reference<deployment::XPackage> > bundle(
+        getBundle( abortChannel, xCmdEnv ) );
+
+    bool reg = false;
+    bool present = false;
+    bool ambig = false;
+    for ( sal_Int32 pos = bundle.getLength(); pos--; )
+    {
+        Reference<deployment::XPackage> const & xPackage = bundle[ pos ];
+        Reference<task::XAbortChannel> xSubAbortChannel(
+            xPackage->createAbortChannel() );
+        AbortChannel::Chain chain( abortChannel, xSubAbortChannel );
+        beans::Optional< beans::Ambiguous<sal_Bool> > option(
+            xPackage->isRegistered( xSubAbortChannel, xCmdEnv ) );
+
+        //present = true if at least one bundle item has this value.
+        //reg = true if all bundle items have an option value (option.IsPresent == 1)
+        //and all have value of true (option.Value.Value == true)
+        //If not, then the bundle has the status of not registered and ambiguous.
+        if (option.IsPresent)
+        {
+            beans::Ambiguous<sal_Bool> const & status = option.Value;
+            if (present)
+            {
+                //we never come here in the first iteration
+                if (reg != bool(status.Value)) {
+
+                    ambig = true;
+                    reg = false;
+                    break;
+                }
+            }
+            else
+            {
+                //we always come here in the first iteration
+                reg = status.Value;
+                present = true;
+            }
+        }
+    }
+    return beans::Optional< beans::Ambiguous<sal_Bool> >(
+        present, beans::Ambiguous<sal_Bool>(reg, ambig) );
+}
+
+OUString BackendImpl::PackageImpl::getTextFromURL(
+    const css::uno::Reference< css::ucb::XCommandEnvironment >& xCmdEnv,
+    const OUString& licenseUrl)
+{
+    try
+    {
+        ::ucbhelper::Content descContent(
+            licenseUrl, xCmdEnv, getMyBackend()->getComponentContext());
+        std::vector<sal_Int8> seq = dp_misc::readFile(descContent);
+        return OUString( reinterpret_cast<char const *>(
+            seq.data()), seq.size(), RTL_TEXTENCODING_UTF8);
+    }
+    catch (const css::uno::Exception&)
+    {
+        Any exc( ::cppu::getCaughtException() );
+        throw css::deployment::DeploymentException(
+                "Could not read file " + licenseUrl, nullptr, exc);
+    }
+
+}
+
+DescriptionInfoset BackendImpl::PackageImpl::getDescriptionInfoset() const
+{
+    return dp_misc::getDescriptionInfoset(m_url_expanded);
+}
+
+bool BackendImpl::PackageImpl::checkPlatform(
+    css::uno::Reference< css::ucb::XCommandEnvironment > const &  environment)
+{
+    bool ret = false;
+    DescriptionInfoset info(getDescriptionInfoset());
+    Sequence<OUString> platforms(info.getSupportedPlatforms());
+    if (hasValidPlatform(platforms))
+    {
+        ret = true;
+    }
+    else
+    {
+        ret = false;
+        OUString msg(
+            "unsupported platform");
+        Any e(
+            css::deployment::PlatformException(
+                msg, static_cast<OWeakObject *>(this), this));
+        if (!interactContinuation(
+                e, cppu::UnoType< css::task::XInteractionApprove >::get(),
+                environment, nullptr, nullptr))
+        {
+            throw css::deployment::DeploymentException(
+                msg, static_cast<OWeakObject *>(this), e);
+        }
+    }
+    return ret;
+}
+
+
+bool BackendImpl::PackageImpl::checkDependencies(
+    css::uno::Reference< css::ucb::XCommandEnvironment > const & environment,
+    DescriptionInfoset const & description)
+{
+    css::uno::Sequence< css::uno::Reference< css::xml::dom::XElement > >
+        unsatisfied(dp_misc::Dependencies::check(description));
+
+    if (!unsatisfied.hasElements()) {
+        return true;
+    } else {
+        OUString msg(
+            "unsatisfied dependencies");
+        Any e(
+            css::deployment::DependencyException(
+                msg, static_cast<OWeakObject *>(this), unsatisfied));
+        if (!interactContinuation(
+                e, cppu::UnoType< css::task::XInteractionApprove >::get(),
+                environment, nullptr, nullptr))
+        {
+            throw css::deployment::DeploymentException(
+                msg, static_cast<OWeakObject *>(this), e);
+        }
+        return false;
+    }
+}
+
+bool BackendImpl::PackageImpl::checkLicense(
+    css::uno::Reference< css::ucb::XCommandEnvironment > const & xCmdEnv,
+    DescriptionInfoset const & info, bool alreadyInstalled)
+{
+    try
+    {
+        ::std::optional<SimpleLicenseAttributes> simplLicAttr
+            = info.getSimpleLicenseAttributes();
+        if (! simplLicAttr)
+            return true;
+        OUString sLic = info.getLocalizedLicenseURL();
+        //If we do not get a localized licence then there is an error in the description.xml
+        //This should be handled by using a validating parser. Therefore we assume that no
+        //license is available.
+        if (sLic.isEmpty())
+            throw css::deployment::DeploymentException(
+                "Could not obtain path to license. Possible error in description.xml", nullptr, Any());
+        OUString sHref = m_url_expanded + "/" + sLic;
+        OUString sLicense = getTextFromURL(xCmdEnv, sHref);
+        ////determine who has to agree to the license
+        //check correct value for attribute
+        if ( simplLicAttr->acceptBy != "user" && simplLicAttr->acceptBy != "admin")
+            throw css::deployment::DeploymentException(
+                "Could not obtain attribute simple-license@accept-by or it has no valid value", nullptr, Any());
+
+
+        //Only use interaction if there is no version of this extension already installed
+        //and the suppress-on-update flag is not set for the new extension
+        // alreadyInstalled | bSuppressOnUpdate | show license
+
+        //      0     |      0            |     1
+        //      0     |      1            |     1
+        //      1     |      0            |     1
+        //      1     |      1            |     0
+
+        if ( !(alreadyInstalled && simplLicAttr->suppressOnUpdate))
+        {
+            css::deployment::LicenseException licExc(
+                OUString(), nullptr, getDisplayName(), sLicense,
+                simplLicAttr->acceptBy);
+            bool approve = false;
+            bool abort = false;
+            if (! interactContinuation(
+                Any(licExc), cppu::UnoType<task::XInteractionApprove>::get(), xCmdEnv, &approve, &abort ))
+                throw css::deployment::DeploymentException(
+                    "Could not interact with user.", nullptr, Any());
+
+            return approve;
+        }
+        return true;
+    } catch (const css::ucb::CommandFailedException&) {
+        throw;
+    } catch (const css::ucb::CommandAbortedException&) {
+        throw;
+    } catch (const css::deployment::DeploymentException&) {
+        throw;
+    } catch (const css::uno::RuntimeException&) {
+        throw;
+    } catch (const css::uno::Exception&) {
+        Any anyExc = cppu::getCaughtException();
+        throw css::deployment::DeploymentException("Unexpected exception", nullptr, anyExc);
+    }
+}
+
+::sal_Int32 BackendImpl::PackageImpl::checkPrerequisites(
+        const css::uno::Reference< css::task::XAbortChannel >&,
+        const css::uno::Reference< css::ucb::XCommandEnvironment >& xCmdEnv,
+        sal_Bool alreadyInstalled)
+{
+    if (m_bRemoved)
+        throw deployment::ExtensionRemovedException();
+    DescriptionInfoset info = getDescriptionInfoset();
+    if (!info.hasDescription())
+        return 0;
+
+    //always return LICENSE as long as the user did not accept the license
+    //so that XExtensionManager::checkPrerequisitesAndEnable will again
+    //check the license
+    if (!checkPlatform(xCmdEnv))
+        return deployment::Prerequisites::PLATFORM |
+            deployment::Prerequisites::LICENSE;
+    else if(!checkDependencies(xCmdEnv, info))
+        return deployment::Prerequisites::DEPENDENCIES |
+            deployment::Prerequisites::LICENSE;
+    else if(!checkLicense(xCmdEnv, info, alreadyInstalled))
+        return deployment::Prerequisites::LICENSE;
+    else
+        return 0;
+}
+
+sal_Bool BackendImpl::PackageImpl::checkDependencies(
+        const css::uno::Reference< css::ucb::XCommandEnvironment >& xCmdEnv )
+{
+    if (m_bRemoved)
+        throw deployment::ExtensionRemovedException();
+    DescriptionInfoset info = getDescriptionInfoset();
+    if (!info.hasDescription())
+        return true;
+
+    return checkDependencies(xCmdEnv, info);
+}
+
+beans::Optional<OUString> BackendImpl::PackageImpl::getIdentifier()
+{
+    OUString identifier;
+    if (m_bRemoved)
+        identifier = m_identifier;
+    else
+        identifier = dp_misc::generateIdentifier(
+            getDescriptionInfoset().getIdentifier(), m_name);
+
+    return beans::Optional<OUString>(
+        true, identifier);
+}
+
+OUString BackendImpl::PackageImpl::getVersion()
+{
+    if (m_bRemoved)
+        throw deployment::ExtensionRemovedException();
+    return getDescriptionInfoset().getVersion();
+}
+
+Sequence<OUString> BackendImpl::PackageImpl::getUpdateInformationURLs()
+{
+    if (m_bRemoved)
+        throw deployment::ExtensionRemovedException();
+    return getDescriptionInfoset().getUpdateInformationUrls();
+}
+
+beans::StringPair BackendImpl::PackageImpl::getPublisherInfo()
+{
+    if (m_bRemoved)
+        throw deployment::ExtensionRemovedException();
+    std::pair< OUString, OUString > aInfo = getDescriptionInfoset().getLocalizedPublisherNameAndURL();
+    beans::StringPair aStrPair( aInfo.first, aInfo.second );
+    return aStrPair;
+}
+
+
+uno::Reference< graphic::XGraphic > BackendImpl::PackageImpl::getIcon( sal_Bool bHighContrast )
+{
+    if (m_bRemoved)
+        throw deployment::ExtensionRemovedException();
+
+    uno::Reference< graphic::XGraphic > xGraphic;
+
+    OUString aIconURL = getDescriptionInfoset().getIconURL( bHighContrast );
+    if ( !aIconURL.isEmpty() )
+    {
+        OUString aFullIconURL = m_url_expanded + "/" + aIconURL;
+
+        uno::Reference< XComponentContext > xContext( getMyBackend()->getComponentContext() );
+        uno::Reference< graphic::XGraphicProvider > xGraphProvider( graphic::GraphicProvider::create(xContext) );
+
+        uno::Sequence< beans::PropertyValue > aMediaProps{ comphelper::makePropertyValue(
+            "URL", aFullIconURL) };
+        xGraphic = xGraphProvider->queryGraphic( aMediaProps );
+    }
+
+    return xGraphic;
+}
+
+
+void BackendImpl::PackageImpl::processPackage_(
+    ::osl::ResettableMutexGuard &,
+    bool doRegisterPackage,
+    bool startup,
+    ::rtl::Reference<AbortChannel> const & abortChannel,
+    Reference<ucb::XCommandEnvironment> const & xCmdEnv )
+{
+    const Sequence< Reference<deployment::XPackage> > bundle(
+        getBundle( abortChannel, xCmdEnv ) );
+
+    if (doRegisterPackage)
+    {
+        ExtensionBackendDb::Data data;
+        const sal_Int32 len = bundle.getLength();
+        for ( sal_Int32 pos = 0; pos < len; ++pos )
+        {
+            checkAborted(abortChannel);
+            Reference<deployment::XPackage> const & xPackage = bundle[ pos ];
+            Reference<task::XAbortChannel> xSubAbortChannel(
+                xPackage->createAbortChannel() );
+            AbortChannel::Chain chain( abortChannel, xSubAbortChannel );
+            try {
+                xPackage->registerPackage( startup, xSubAbortChannel, xCmdEnv );
+            }
+            catch (const Exception &)
+            {
+               //We even try a rollback if the user cancelled the action (CommandAbortedException)
+                //in order to prevent invalid database entries.
+                Any exc( ::cppu::getCaughtException() );
+                // try to handle exception, notify:
+                bool approve = false, abort = false;
+                if (! interactContinuation(
+                        Any( lang::WrappedTargetException(
+                                 "bundle item registration error!",
+                                 static_cast<OWeakObject *>(this), exc ) ),
+                        cppu::UnoType<task::XInteractionApprove>::get(), xCmdEnv,
+                        &approve, &abort )) {
+                    OSL_ASSERT( !approve && !abort );
+                    if (m_legacyBundle) // default for legacy packages: ignore
+                        continue;
+                    // no selection at all, so rethrow;
+                    // no C++ rethrow after getCaughtException(),
+                    // see cppuhelper/exc_hlp.hxx:
+                    ::cppu::throwException(exc);
+                }
+                if (approve && !abort) // ignore error, just continue
+                    continue;
+
+                {
+                    ProgressLevel progress( xCmdEnv, "rollback..." );
+                    // try rollback
+                    for ( ; pos--; )
+                    {
+                        try {
+                            bundle[ pos ]->revokePackage(
+                                startup, xSubAbortChannel, xCmdEnv );
+                        }
+                        catch (const Exception &)
+                        {
+                            TOOLS_WARN_EXCEPTION( "desktop", "" );
+                            // ignore any errors of rollback
+                        }
+                    }
+                    progress.update( "rollback finished." );
+                }
+
+                deployment::DeploymentException dpExc;
+                if (exc >>= dpExc) {
+                    throw ucb::CommandFailedException(
+                        dpExc.Message, dpExc.Context, dpExc.Cause );
+                }
+                else {
+                    // rethrow CommandFailedException
+                    ::cppu::throwException(exc);
+                }
+            }
+            data.items.emplace_back(xPackage->getURL(),
+                                 xPackage->getPackageType()->getMediaType());
+        }
+        getMyBackend()->addDataToDb(getURL(), data);
+    }
+    else
+    {
+        // revoke in reverse order:
+        for ( sal_Int32 pos = bundle.getLength(); pos--; )
+        {
+            checkAborted(abortChannel);
+            Reference<deployment::XPackage> const & xPackage = bundle[ pos ];
+            Reference<task::XAbortChannel> xSubAbortChannel(
+                xPackage->createAbortChannel() );
+            AbortChannel::Chain chain( abortChannel, xSubAbortChannel );
+            try {
+                bundle[ pos ]->revokePackage(
+                    startup, xSubAbortChannel, xCmdEnv );
+            }
+            catch (const RuntimeException &) {
+                throw;
+            }
+            catch (const ucb::CommandAbortedException &) {
+                throw;
+            }
+            catch (const Exception &) {
+                // CommandFailedException, DeploymentException:
+                Any exc( ::cppu::getCaughtException() );
+                // try to handle exception, notify:
+                bool approve = false, abort = false;
+                if (! interactContinuation(
+                        Any( lang::WrappedTargetException(
+                                 "bundle item revocation error!",
+                                 static_cast<OWeakObject *>(this), exc ) ),
+                        cppu::UnoType<task::XInteractionApprove>::get(), xCmdEnv,
+                        &approve, &abort )) {
+                    OSL_ASSERT( !approve && !abort );
+                    if (m_legacyBundle) // default for legacy packages: ignore
+                        continue;
+                    // no selection at all, so rethrow
+                    // no C++ rethrow after getCaughtException(),
+                    // see cppuhelper/exc_hlp.hxx:
+                    ::cppu::throwException(exc);
+                }
+                // ignore errors when revoking, although abort may have been
+                // selected
+            }
+        }
+        getMyBackend()->revokeEntryFromDb(getURL());
+    }
+}
+
+
+OUString BackendImpl::PackageImpl::getDescription()
+{
+    if (m_bRemoved)
+        throw deployment::ExtensionRemovedException();
+
+    const OUString sRelativeURL(getDescriptionInfoset().getLocalizedDescriptionURL());
+    OUString sDescription;
+    if (!sRelativeURL.isEmpty())
+    {
+        OUString sURL = m_url_expanded + "/" + sRelativeURL;
+
+        try
+        {
+            sDescription = getTextFromURL( css::uno::Reference< css::ucb::XCommandEnvironment >(), sURL );
+        }
+        catch ( const css::deployment::DeploymentException& )
+        {
+            TOOLS_WARN_EXCEPTION( "desktop", "" );
+        }
+    }
+
+    if (!sDescription.isEmpty())
+        return sDescription;
+    return m_oldDescription;
+}
+
+
+OUString BackendImpl::PackageImpl::getLicenseText()
+{
+    if (m_bRemoved)
+        throw deployment::ExtensionRemovedException();
+
+    OUString sLicense;
+    DescriptionInfoset aInfo = getDescriptionInfoset();
+
+    ::std::optional< SimpleLicenseAttributes > aSimplLicAttr = aInfo.getSimpleLicenseAttributes();
+    if ( aSimplLicAttr )
+    {
+        OUString aLicenseURL = aInfo.getLocalizedLicenseURL();
+
+        if ( !aLicenseURL.isEmpty() )
+        {
+            OUString aFullURL = m_url_expanded + "/" + aLicenseURL;
+            sLicense = getTextFromURL( Reference< ucb::XCommandEnvironment >(), aFullURL);
+        }
+    }
+
+    return sLicense;
+}
+
+
+void BackendImpl::PackageImpl::exportTo(
+    OUString const & destFolderURL, OUString const & newTitle,
+    sal_Int32 nameClashAction, Reference<ucb::XCommandEnvironment> const & xCmdEnv )
+{
+    if (m_bRemoved)
+        throw deployment::ExtensionRemovedException();
+
+    ::ucbhelper::Content sourceContent(
+        m_url_expanded, xCmdEnv, getMyBackend()->getComponentContext() );
+    OUString title(newTitle);
+    if (title.isEmpty())
+        sourceContent.getPropertyValue( "Title" ) >>= title;
+    OUString destURL( makeURL( destFolderURL, ::rtl::Uri::encode(
+                                   title, rtl_UriCharClassPchar,
+                                   rtl_UriEncodeIgnoreEscapes,
+                                   RTL_TEXTENCODING_UTF8 ) ) );
+
+    if (nameClashAction == ucb::NameClash::ASK)
+    {
+        if (create_ucb_content(
+                nullptr, destURL, xCmdEnv, false /* no throw */ )) {
+            bool replace = false, abort = false;
+            if (! interactContinuation(
+                    Any( ucb::NameClashResolveRequest(
+                             "file already exists: " + title,
+                             static_cast<OWeakObject *>(this),
+                             task::InteractionClassification_QUERY,
+                             destFolderURL, title, OUString() ) ),
+                    cppu::UnoType<ucb::XInteractionReplaceExistingData>::get(), xCmdEnv,
+                    &replace, &abort ) || !replace) {
+                return;
+            }
+        }
+    }
+    else if (nameClashAction != ucb::NameClash::OVERWRITE) {
+        throw ucb::CommandFailedException("unsupported nameClashAction!",
+            static_cast<OWeakObject *>(this), Any() );
+    }
+    erase_path( destURL, xCmdEnv );
+
+    OUString destFolder =
+        "vnd.sun.star.zip://" +
+        ::rtl::Uri::encode( destURL,
+                            rtl_UriCharClassRegName,
+                            rtl_UriEncodeIgnoreEscapes,
+                            RTL_TEXTENCODING_UTF8 ) +
+        "/";
+
+    ::ucbhelper::Content destFolderContent(
+        destFolder, xCmdEnv, getMyBackend()->getComponentContext() );
+    {
+        // transfer every item of folder into zip:
+        Reference<sdbc::XResultSet> xResultSet(
+            sourceContent.createCursor( Sequence<OUString>() ) );
+        ProgressLevel progress( xCmdEnv, OUString() );
+        while (xResultSet->next())
+        {
+            ::ucbhelper::Content subContent(
+                Reference<ucb::XContentAccess>(
+                    xResultSet, UNO_QUERY_THROW )->queryContent(),
+                xCmdEnv, getMyBackend()->getComponentContext() );
+            destFolderContent.transferContent(
+                    subContent, ::ucbhelper::InsertOperation::Copy,
+                    OUString(), ucb::NameClash::OVERWRITE );
+            progress.update( Any() ); // animating progress bar
+        }
+    }
+
+    // assure META-INF folder:
+    ::ucbhelper::Content metainfFolderContent;
+    create_folder( &metainfFolderContent,
+                   makeURL( destFolderContent.getURL(), "META-INF" ),
+                   xCmdEnv );
+
+    if (m_legacyBundle)
+    {
+        // easy to migrate legacy bundles to new format:
+        // just export them once using a .oxt name!
+        // set detected media-types of any bundle item:
+
+        // collect all manifest entries:
+        Sequence< Reference<deployment::XPackage> > bundle;
+        try {
+            bundle = getBundle( Reference<task::XAbortChannel>(), xCmdEnv );
+        }
+        // xxx todo: think about exception specs:
+        catch (const deployment::DeploymentException &) {
+            TOOLS_WARN_EXCEPTION( "desktop", "" );
+        }
+        catch (const lang::IllegalArgumentException &) {
+            TOOLS_WARN_EXCEPTION( "desktop", "" );
+        }
+
+        std::vector< Sequence<beans::PropertyValue> > manifest;
+        manifest.reserve( bundle.getLength() );
+        sal_Int32 baseURLlen = m_url_expanded.getLength();
+        Reference<deployment::XPackage> const *pbundle = bundle.getConstArray();
+        static const OUStringLiteral strMediaType( u"MediaType" );
+        static const OUStringLiteral strFullPath( u"FullPath" );
+        static const OUStringLiteral strIsFolder( u"IsFolder" );
+        for ( sal_Int32 pos = bundle.getLength(); pos--; )
+        {
+            Reference<deployment::XPackage> const & xPackage = pbundle[ pos ];
+            OUString url_( expandUnoRcUrl( xPackage->getURL() ) );
+            OSL_ASSERT( url_.getLength() >= baseURLlen );
+            OUString fullPath;
+            if (url_.getLength() > baseURLlen)
+                fullPath = url_.copy( baseURLlen + 1 );
+            ::ucbhelper::Content ucbContent(
+                url_, xCmdEnv, getMyBackend()->getComponentContext() );
+            if (ucbContent.getPropertyValue(strIsFolder).get<bool>())
+                fullPath += "/";
+            Sequence<beans::PropertyValue> attribs( 2 );
+            beans::PropertyValue * pattribs = attribs.getArray();
+            pattribs[ 0 ].Name = strFullPath;
+            pattribs[ 0 ].Value <<= fullPath;
+            pattribs[ 1 ].Name = strMediaType;
+            const Reference<deployment::XPackageTypeInfo> xPackageType(
+                xPackage->getPackageType() );
+            OUString mediaType;
+            OSL_ASSERT( xPackageType.is() );
+            if (xPackageType.is())
+                mediaType = xPackageType->getMediaType();
+            else
+                mediaType = "unknown";
+            pattribs[ 1 ].Value <<= mediaType;
+            manifest.push_back( attribs );
+        }
+
+        // write into pipe:
+        Reference<XComponentContext> xContext(
+            getMyBackend()->getComponentContext() );
+        Reference<packages::manifest::XManifestWriter> xManifestWriter =
+            packages::manifest::ManifestWriter::create( xContext );
+        Reference<io::XOutputStream> xPipe( io::Pipe::create(xContext), UNO_QUERY_THROW );
+        xManifestWriter->writeManifestSequence(
+            xPipe, comphelper::containerToSequence(manifest) );
+
+        // write buffered pipe data to content:
+        ::ucbhelper::Content manifestContent(
+            makeURL( metainfFolderContent.getURL(), "manifest.xml" ),
+            xCmdEnv, getMyBackend()->getComponentContext() );
+        manifestContent.writeStream(
+            Reference<io::XInputStream>( xPipe, UNO_QUERY_THROW ),
+            true /* replace existing */ );
+    }
+    else
+    {
+        bool bSuccess = false;
+        try
+        {
+            // overwrite manifest.xml:
+            ::ucbhelper::Content manifestContent;
+            if ( ! create_ucb_content(
+                &manifestContent,
+                makeURL( m_url_expanded, "META-INF/manifest.xml" ),
+                xCmdEnv, false ) )
+            {
+                OSL_FAIL( "### missing META-INF/manifest.xml file!" );
+                return;
+            }
+
+            metainfFolderContent.transferContent(
+                  manifestContent, ::ucbhelper::InsertOperation::Copy,
+                  OUString(), ucb::NameClash::OVERWRITE );
+            bSuccess = true;
+        }
+        catch (const css::ucb::ContentCreationException &)
+        {
+            TOOLS_WARN_EXCEPTION("desktop.deployment", "exception on overwriting manifest");
+        }
+
+        if (!bSuccess)
+            throw RuntimeException( "UCB transferContent() failed!",
+                                    static_cast<OWeakObject *>(this) );
+    }
+
+    // xxx todo: maybe obsolete in the future
+    try {
+        destFolderContent.executeCommand( "flush", Any() );
+    }
+    catch (const ucb::UnsupportedCommandException &) {
+    }
+}
+
+
+sal_Bool BackendImpl::PackageImpl::isBundle()
+{
+    return true;
+}
+
+
+Sequence< Reference<deployment::XPackage> > BackendImpl::PackageImpl::getBundle(
+    Reference<task::XAbortChannel> const & xAbortChannel,
+    Reference<ucb::XCommandEnvironment> const & xCmdEnv )
+{
+    Sequence< Reference<deployment::XPackage> > * pBundle = m_pBundle;
+    if (pBundle == nullptr)
+    {
+        t_packagevec bundle;
+        if (m_bRemoved)
+        {
+            bundle = getPackagesFromDb(xCmdEnv);
+        }
+        else
+        {
+            try {
+                if (m_legacyBundle)
+                {
+                    // .zip legacy packages allow script.xlb, dialog.xlb in bundle
+                    // root folder:
+                    OUString mediaType;
+                    // probe for script.xlb:
+                    if (create_ucb_content(
+                            nullptr, makeURL( m_url_expanded, "script.xlb" ),
+                            xCmdEnv, false /* no throw */ )) {
+                        mediaType = "application/vnd.sun.star.basic-library";
+                    }
+                    // probe for dialog.xlb:
+                    else if (create_ucb_content(
+                                 nullptr, makeURL( m_url_expanded, "dialog.xlb" ),
+                                 xCmdEnv, false /* no throw */ ))
+                        mediaType = "application/vnd.sun.star.dialog-library";
+
+                    if (!mediaType.isEmpty()) {
+                        const Reference<deployment::XPackage> xPackage(
+                            bindBundleItem( getURL(), mediaType, false, OUString(),
+                                            xCmdEnv ) );
+                        if (xPackage.is())
+                            bundle.push_back( xPackage );
+                        // continue scanning:
+                    }
+                    scanLegacyBundle( bundle, getURL(),
+                                      AbortChannel::get(xAbortChannel), xCmdEnv );
+                }
+                else
+                {
+                    // .oxt:
+                    scanBundle( bundle, AbortChannel::get(xAbortChannel), xCmdEnv );
+                }
+
+            }
+            catch (const RuntimeException &) {
+                throw;
+            }
+            catch (const ucb::CommandFailedException &) {
+                throw;
+            }
+            catch (const ucb::CommandAbortedException &) {
+                throw;
+            }
+            catch (const deployment::DeploymentException &) {
+                throw;
+            }
+            catch (const Exception &) {
+                Any exc( ::cppu::getCaughtException() );
+                throw deployment::DeploymentException(
+                    "error scanning bundle: " + getURL(),
+                    static_cast<OWeakObject *>(this), exc );
+            }
+        }
+
+        // sort: schema before config data, typelibs before components:
+        Sequence< Reference<deployment::XPackage> > ret( bundle.size() );
+        Reference<deployment::XPackage> * pret = ret.getArray();
+        sal_Int32 lower_end = 0;
+        sal_Int32 upper_end = ret.getLength();
+        for (auto const& elem : bundle)
+        {
+            const Reference<deployment::XPackageTypeInfo> xPackageType(
+                elem->getPackageType() );
+            OSL_ASSERT( xPackageType.is() );
+            if (xPackageType.is())
+            {
+                const OUString mediaType( xPackageType->getMediaType() );
+                OUString type, subType;
+                INetContentTypeParameterList params;
+                if (INetContentTypes::parse( mediaType, type, subType, &params ) &&
+                    type.equalsIgnoreAsciiCase("application") &&
+                    (subType.equalsIgnoreAsciiCase( "vnd.sun.star.uno-component") ||
+                     subType.equalsIgnoreAsciiCase( "vnd.sun.star.configuration-data")))
+                {
+                    --upper_end;
+                    pret[ upper_end ] = elem;
+                    continue;
+                }
+            }
+            pret[ lower_end ] = elem;
+            ++lower_end;
+        }
+        OSL_ASSERT( lower_end == upper_end );
+
+        const ::osl::MutexGuard guard( m_aMutex );
+        pBundle = m_pBundle;
+        if (pBundle == nullptr) {
+            m_bundle = ret;
+            pBundle = &m_bundle;
+            OSL_DOUBLE_CHECKED_LOCKING_MEMORY_BARRIER();
+            m_pBundle = pBundle;
+        }
+    }
+    else {
+        OSL_DOUBLE_CHECKED_LOCKING_MEMORY_BARRIER();
+    }
+    return *pBundle;
+}
+
+bool isBundle_( std::u16string_view mediaType )
+{
+    // xxx todo: additional parsing?
+    return !mediaType.empty() &&
+        (o3tl::matchIgnoreAsciiCase( mediaType, u"application/vnd.sun.star.package-bundle") ||
+         o3tl::matchIgnoreAsciiCase( mediaType, u"application/vnd.sun.star.legacy-package-bundle"));
+}
+
+
+Reference<deployment::XPackage> BackendImpl::PackageImpl::bindBundleItem(
+    OUString const & url, OUString const & mediaType,
+    bool bRemoved, OUString const & identifier,
+    Reference<ucb::XCommandEnvironment> const & xCmdEnv,
+    bool notifyDetectionError )
+{
+    // ignore any nested bundles:
+    if (isBundle_(mediaType))
+        return Reference<deployment::XPackage>();
+
+    Reference<deployment::XPackage>xPackage;
+    try {
+        try {
+            xPackage.set( getMyBackend()->m_xRootRegistry->bindPackage(
+                              url, mediaType, bRemoved, identifier, xCmdEnv ) );
+            OSL_ASSERT( xPackage.is() );
+        } catch (css::lang::IllegalArgumentException & e) {
+            css::uno::Any exc(cppu::getCaughtException());
+            throw css::lang::WrappedTargetException(
+                "wrapped: " + e.Message, e.Context, exc);
+        }
+    }
+    catch (const RuntimeException &) {
+        throw;
+    }
+    catch (const ucb::CommandFailedException &) {
+        // ignore already handled error
+    }
+    catch (const Exception &) {
+        const Any exc( ::cppu::getCaughtException() );
+        if (notifyDetectionError ||
+            !exc.isExtractableTo( cppu::UnoType<lang::IllegalArgumentException>::get()) )
+        {
+            (void)interactContinuation(
+                Any( lang::WrappedTargetException("bundle item error!",
+                         static_cast<OWeakObject *>(this), exc ) ),
+                cppu::UnoType<task::XInteractionApprove>::get(), xCmdEnv, nullptr, nullptr );
+        }
+    }
+
+    if (xPackage.is()) {
+        const Reference<deployment::XPackageTypeInfo> xPackageType(
+            xPackage->getPackageType() );
+        OSL_ASSERT( xPackageType.is() );
+        // ignore any nested bundles:
+        if (xPackageType.is() && isBundle_( xPackageType->getMediaType() ))
+            xPackage.clear();
+    }
+    return xPackage;
+}
+
+
+void BackendImpl::PackageImpl::scanBundle(
+    t_packagevec & bundle,
+    ::rtl::Reference<AbortChannel> const & abortChannel,
+    Reference<ucb::XCommandEnvironment> const & xCmdEnv )
+{
+    OSL_ASSERT( !m_legacyBundle );
+
+    OUString mfUrl( makeURL( m_url_expanded, "META-INF/manifest.xml" ) );
+    ::ucbhelper::Content manifestContent;
+    if (! create_ucb_content(
+            &manifestContent, mfUrl, xCmdEnv, false /* no throw */ ))
+    {
+        SAL_WARN(
+            "desktop.deployment",
+            "cannot create UCB Content for <" << mfUrl << ">" );
+        return;
+    }
+
+
+    const LanguageTag& officeLocale = getOfficeLanguageTag();
+    const std::vector< OUString > officeFallbacks( officeLocale.getFallbackStrings( true));
+    const size_t nPenaltyMax = std::numeric_limits<size_t>::max();
+    size_t descrPenalty = nPenaltyMax;
+    OUString descrFile;
+
+    const Reference<XComponentContext> xContext(
+        getMyBackend()->getComponentContext() );
+    Reference<packages::manifest::XManifestReader> xManifestReader =
+        packages::manifest::ManifestReader::create( xContext );
+    const Sequence< Sequence<beans::PropertyValue> > manifestSeq(
+        xManifestReader->readManifestSequence( manifestContent.openStream() ) );
+    const OUString packageRootURL( getURL() );
+    for ( sal_Int32 pos = manifestSeq.getLength(); pos--; )
+    {
+        OUString fullPath, mediaType;
+        Sequence<beans::PropertyValue> const & attribs = manifestSeq[ pos ];
+        for ( sal_Int32 i = attribs.getLength(); i--; )
+        {
+            if (!(fullPath.isEmpty() || mediaType.isEmpty()))
+                break;
+            if ( attribs[i].Name == "FullPath" )
+                attribs[i].Value >>= fullPath;
+            else if ( attribs[i].Name == "MediaType" )
+                attribs[i].Value >>= mediaType;
+        }
+
+        if ( fullPath.isEmpty() || mediaType.isEmpty() || mediaType == "text/xml" )// opt: exclude common text/xml
+            continue;
+
+        OUString type, subType;
+        INetContentTypeParameterList params;
+        if (! INetContentTypes::parse( mediaType, type, subType, &params ))
+            continue;
+
+        {
+            auto const iter = params.find("platform");
+            if (iter != params.end() && !platform_fits(iter->second.m_sValue))
+                continue;
+        }
+        const OUString url( makeURL( packageRootURL, fullPath ) );
+
+        // check for bundle description:
+        if (type.equalsIgnoreAsciiCase("application") &&
+            subType.equalsIgnoreAsciiCase( "vnd.sun.star.package-bundle-description"))
+        {
+            // check locale:
+            auto const iter = params.find("locale");
+            if (iter == params.end())
+            {
+                if (descrFile.isEmpty())
+                    descrFile = url;
+            }
+            else {
+                // match best locale:
+                LanguageTag descrTag(iter->second.m_sValue);
+                if (officeLocale.getLanguage() == descrTag.getLanguage())
+                {
+                    size_t nPenalty = nPenaltyMax;
+                    const std::vector< OUString > descrFallbacks( descrTag.getFallbackStrings( true));
+                    for (size_t o=0; o < officeFallbacks.size() && nPenalty == nPenaltyMax; ++o)
+                    {
+                        for (size_t d=0; d < descrFallbacks.size() && nPenalty == nPenaltyMax; ++d)
+                        {
+                            if (officeFallbacks[o] == descrFallbacks[d])
+                            {
+                                // The last fallbacks are always language-only
+                                // fallbacks, so we _will_ have _some_ match if
+                                // we ever entered the overall if() condition.
+                                nPenalty = o * 1000 + d;
+                                if (descrPenalty > nPenalty)
+                                {
+                                    descrPenalty = nPenalty;
+                                    descrFile = url;
+                                }
+                            }
+                        }
+                    }
+                }
+                // TODO: we could break here if descrPenalty==0 for an exact
+                // match of officeLocale, but the previous code didn't; are
+                // there side effects?
+            }
+            continue;
+        }
+
+        checkAborted( abortChannel );
+
+        //We make sure that we only create one XPackage for a particular URL.
+        //Sometime programmers insert the same URL several times in the manifest
+        //which may lead to DisposedExceptions.
+        if (std::none_of(bundle.begin(), bundle.end(), XPackage_eq(url)))
+        {
+            const Reference<deployment::XPackage> xPackage(
+                bindBundleItem( url, mediaType, false, OUString(), xCmdEnv ) );
+            if (xPackage.is())
+                bundle.push_back( xPackage );
+        }
+        else
+        {
+            SAL_WARN("desktop.deployment", "manifest.xml contains a duplicate entry (from " << url << ")");
+        }
+    }
+
+    if (descrFile.isEmpty())
+        return;
+
+    ::ucbhelper::Content descrFileContent;
+    if (!create_ucb_content( &descrFileContent, descrFile,
+                            xCmdEnv, false /* no throw */ ))
+        return;
+
+    // patch description:
+    std::vector<sal_Int8> bytes( readFile( descrFileContent ) );
+    OUStringBuffer buf;
+    if ( !bytes.empty() )
+    {
+        buf.append( OUString( reinterpret_cast<char const *>(
+                                  bytes.data() ),
+                              bytes.size(), RTL_TEXTENCODING_UTF8 ) );
+    }
+    else
+    {
+        buf.append( Package::getDescription() );
+    }
+    m_oldDescription = buf.makeStringAndClear();
+}
+
+
+void BackendImpl::PackageImpl::scanLegacyBundle(
+    t_packagevec & bundle,
+    OUString const & url,
+    ::rtl::Reference<AbortChannel> const & abortChannel,
+    Reference<ucb::XCommandEnvironment> const & xCmdEnv,
+    bool skip_registration )
+{
+    ::ucbhelper::Content ucbContent(
+        url, xCmdEnv, getMyBackend()->getComponentContext() );
+
+    // check for platform paths:
+    const OUString title( StrTitle::getTitle( ucbContent ) );
+    if (title.endsWithIgnoreAsciiCase( ".plt" ) &&
+        !platform_fits( title.subView( 0, title.getLength() - 4 ) )) {
+        return;
+    }
+    if (title.endsWithIgnoreAsciiCase("skip_registration") )
+        skip_registration = true;
+
+    Sequence<OUString> ar { OUString("Title"), OUString("IsFolder") };
+    Reference<sdbc::XResultSet> xResultSet( ucbContent.createCursor( ar ) );
+    while (xResultSet->next())
+    {
+        checkAborted( abortChannel );
+
+        const Reference<sdbc::XRow> xRow( xResultSet, UNO_QUERY_THROW );
+        const OUString title_enc( ::rtl::Uri::encode(
+                                      xRow->getString( 1 /* Title */ ),
+                                      rtl_UriCharClassPchar,
+                                      rtl_UriEncodeIgnoreEscapes,
+                                      RTL_TEXTENCODING_UTF8 ) );
+        const OUString path( makeURL( url, title_enc ) );
+
+        OUString mediaType;
+        const Reference<deployment::XPackage> xPackage(
+            bindBundleItem( path, OUString() /* detect */, false, OUString(),
+                            xCmdEnv, false /* ignore detection errors */ ) );
+        if (xPackage.is()) {
+            const Reference<deployment::XPackageTypeInfo> xPackageType(
+                xPackage->getPackageType() );
+            OSL_ASSERT( xPackageType.is() );
+            if (xPackageType.is())
+                mediaType = xPackageType->getMediaType();
+
+            if (skip_registration &&
+                // xxx todo: additional parsing?
+                mediaType.matchIgnoreAsciiCase("application/vnd.sun.star.uno-component"))
+                continue;
+
+            bundle.push_back( xPackage );
+        }
+
+        if (mediaType.isEmpty() ||
+            // script.xlb, dialog.xlb can be met everywhere:
+            mediaType.matchIgnoreAsciiCase("application/vnd.sun.star.basic-library") ||
+            mediaType.matchIgnoreAsciiCase("application/vnd.sun.star.dialog-library"))
+        {
+            if (xRow->getBoolean( 2 /* IsFolder */ )) { // recurse into folder:
+                scanLegacyBundle(
+                    bundle, path, abortChannel, xCmdEnv, skip_registration );
+            }
+        }
+    }
+}
+
+OUString BackendImpl::PackageImpl::getDisplayName()
+{
+    if (m_bRemoved)
+        throw deployment::ExtensionRemovedException();
+
+    OUString sName = getDescriptionInfoset().getLocalizedDisplayName();
+    if (sName.isEmpty())
+        return m_displayName;
+    else
+        return sName;
+}
+
+std::vector<Reference<deployment::XPackage> >
+BackendImpl::PackageImpl::getPackagesFromDb(
+    Reference<ucb::XCommandEnvironment> const & xCmdEnv)
+{
+    std::vector<Reference<deployment::XPackage> > retVector;
+
+    for (auto const& item : m_dbData.items)
+    {
+        Reference<deployment::XPackage> xExtension =
+            bindBundleItem(item.first, item.second, true, m_identifier, xCmdEnv);
+        OSL_ASSERT(xExtension.is());
+        if (xExtension.is())
+            retVector.push_back(xExtension);
+    }
+
+    return retVector;
+}
+
+} // anon namespace
+
+
+Reference<deployment::XPackageRegistry> create(
+    Reference<deployment::XPackageRegistry> const & xRootRegistry,
+    OUString const & context, OUString const & cachePath,
+    Reference<XComponentContext> const & xComponentContext )
+{
+    Sequence<Any> args(cachePath.isEmpty() ? 1 : 3 );
+    auto pArgs = args.getArray();
+    pArgs[ 0 ] <<= context;
+    if (!cachePath.isEmpty()) {
+        pArgs[ 1 ] <<= cachePath;
+        pArgs[ 2 ] <<= false; // readOnly
+    }
+    return new BackendImpl( args, xComponentContext, xRootRegistry );
+}
+
+} // namespace dp_registry
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/desktop/source/deployment/registry/script/dp_lib_container.cxx b/desktop/source/deployment/registry/script/dp_lib_container.cxx
new file mode 100644
index 000000000..3a6f30253
--- /dev/null
+++ b/desktop/source/deployment/registry/script/dp_lib_container.cxx
@@ -0,0 +1,64 @@
+/* -*- 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 <com/sun/star/uno/XComponentContext.hpp>
+#include <com/sun/star/ucb/XCommandEnvironment.hpp>
+
+#include <strings.hrc>
+#include <dp_resource.h>
+#include <dp_shared.hxx>
+#include <dp_xml.h>
+#include "dp_lib_container.h"
+
+#include <rtl/ustring.hxx>
+#include <ucbhelper/content.hxx>
+#include <xmlscript/xmllib_imexp.hxx>
+
+
+using namespace ::dp_misc;
+using namespace ::com::sun::star;
+using namespace ::com::sun::star::uno;
+using namespace ::com::sun::star::ucb;
+
+namespace dp_registry::backend::script {
+
+namespace {
+    OUString StrCannotDetermineLibName() { return DpResId(RID_STR_CANNOT_DETERMINE_LIBNAME); }
+}
+
+OUString LibraryContainer::get_libname(
+    OUString const & url,
+    Reference<XCommandEnvironment> const & xCmdEnv,
+    Reference<XComponentContext> const & xContext )
+{
+    ::xmlscript::LibDescriptor import;
+    ::ucbhelper::Content ucb_content( url, xCmdEnv, xContext );
+    xml_parse( ::xmlscript::importLibrary( import ), ucb_content, xContext );
+
+    if (import.aName.isEmpty()) {
+        throw Exception( StrCannotDetermineLibName(),
+                         Reference<XInterface>() );
+    }
+    return import.aName;
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/desktop/source/deployment/registry/script/dp_lib_container.h b/desktop/source/deployment/registry/script/dp_lib_container.h
new file mode 100644
index 000000000..fbbedf866
--- /dev/null
+++ b/desktop/source/deployment/registry/script/dp_lib_container.h
@@ -0,0 +1,48 @@
+/* -*- 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 .
+ */
+
+#pragma once
+
+#include <com/sun/star/uno/Reference.hxx>
+
+namespace com::sun::star {
+    namespace uno {
+        class XComponentContext;
+    }
+    namespace ucb {
+        class XCommandEnvironment;
+    }
+}
+
+
+namespace dp_registry::backend::script {
+
+
+class LibraryContainer
+{
+public:
+    static OUString get_libname(
+        OUString const & url,
+        css::uno::Reference<css::ucb::XCommandEnvironment> const & xCmdEnv,
+        css::uno::Reference<css::uno::XComponentContext> const & xContext );
+};
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/desktop/source/deployment/registry/script/dp_script.cxx b/desktop/source/deployment/registry/script/dp_script.cxx
new file mode 100644
index 000000000..47e41a364
--- /dev/null
+++ b/desktop/source/deployment/registry/script/dp_script.cxx
@@ -0,0 +1,480 @@
+/* -*- 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 <strings.hrc>
+#include "dp_lib_container.h"
+#include <dp_backend.h>
+#include <dp_misc.h>
+#include <dp_ucb.h>
+#include <ucbhelper/content.hxx>
+#include <cppuhelper/implbase.hxx>
+#include <svl/inettype.hxx>
+#include <com/sun/star/util/XUpdatable.hpp>
+#include <com/sun/star/script/XLibraryContainer3.hpp>
+#include <memory>
+#include <string_view>
+
+#include "dp_scriptbackenddb.hxx"
+#include <cppuhelper/supportsservice.hxx>
+
+using namespace ::dp_misc;
+using namespace ::com::sun::star;
+using namespace ::com::sun::star::uno;
+using namespace ::com::sun::star::ucb;
+
+namespace dp_registry::backend::script {
+namespace {
+
+typedef ::cppu::ImplInheritanceHelper<
+    ::dp_registry::backend::PackageRegistryBackend, util::XUpdatable > t_helper;
+
+class BackendImpl : public t_helper
+{
+    class PackageImpl : public ::dp_registry::backend::Package
+    {
+        BackendImpl * getMyBackend() const;
+
+        const OUString m_scriptURL;
+        const OUString m_dialogURL;
+        OUString m_dialogName;
+
+        // Package
+        virtual beans::Optional< beans::Ambiguous<sal_Bool> > isRegistered_(
+            ::osl::ResettableMutexGuard & guard,
+            ::rtl::Reference<AbortChannel> const & abortChannel,
+            Reference<XCommandEnvironment> const & xCmdEnv ) override;
+        virtual void processPackage_(
+            ::osl::ResettableMutexGuard & guard,
+            bool registerPackage,
+            bool startup,
+            ::rtl::Reference<AbortChannel> const & abortChannel,
+            Reference<XCommandEnvironment> const & xCmdEnv ) override;
+
+    public:
+        PackageImpl(
+            ::rtl::Reference<BackendImpl> const & myBackend,
+            OUString const & url,
+            Reference<XCommandEnvironment> const &xCmdEnv,
+            OUString const & scriptURL, OUString const & dialogURL,
+            bool bRemoved, OUString const & identifier);
+    };
+    friend class PackageImpl;
+
+    // PackageRegistryBackend
+    virtual Reference<deployment::XPackage> bindPackage_(
+        OUString const & url, OUString const & mediaType,
+        bool bRemoved, OUString const & identifier,
+        Reference<XCommandEnvironment> const & xCmdEnv ) override;
+
+    void addDataToDb(OUString const & url);
+    bool hasActiveEntry(std::u16string_view url);
+    void revokeEntryFromDb(std::u16string_view url);
+
+    const Reference<deployment::XPackageTypeInfo> m_xBasicLibTypeInfo;
+    const Reference<deployment::XPackageTypeInfo> m_xDialogLibTypeInfo;
+    Sequence< Reference<deployment::XPackageTypeInfo> > m_typeInfos;
+    std::unique_ptr<ScriptBackendDb> m_backendDb;
+public:
+    BackendImpl( Sequence<Any> const & args,
+                 Reference<XComponentContext> const & xComponentContext );
+
+    // XServiceInfo
+    virtual OUString SAL_CALL getImplementationName() override;
+    virtual sal_Bool SAL_CALL supportsService( const OUString& ServiceName ) override;
+    virtual css::uno::Sequence< OUString > SAL_CALL getSupportedServiceNames() override;
+
+    // XUpdatable
+    virtual void SAL_CALL update() override;
+
+    // XPackageRegistry
+    virtual Sequence< Reference<deployment::XPackageTypeInfo> > SAL_CALL
+    getSupportedPackageTypes() override;
+    virtual void SAL_CALL packageRemoved(OUString const & url, OUString const & mediaType) override;
+
+};
+
+
+BackendImpl::PackageImpl::PackageImpl(
+    ::rtl::Reference<BackendImpl> const & myBackend,
+    OUString const & url,
+    Reference<XCommandEnvironment> const &xCmdEnv,
+    OUString const & scriptURL, OUString const & dialogURL, bool bRemoved,
+    OUString const & identifier)
+    : Package( myBackend, url,
+               OUString(), OUString(), // will be late-initialized
+               !scriptURL.isEmpty() ? myBackend->m_xBasicLibTypeInfo
+               : myBackend->m_xDialogLibTypeInfo, bRemoved, identifier),
+      m_scriptURL( scriptURL ),
+      m_dialogURL( dialogURL )
+{
+    // name, displayName:
+    if (!dialogURL.isEmpty()) {
+        m_dialogName = LibraryContainer::get_libname(
+            dialogURL, xCmdEnv, myBackend->getComponentContext() );
+    }
+    if (!scriptURL.isEmpty()) {
+        assert(m_name.pData);
+        m_name = LibraryContainer::get_libname(
+            scriptURL, xCmdEnv, myBackend->getComponentContext() );
+    }
+    else
+        m_name = m_dialogName;
+    m_displayName = m_name;
+}
+
+
+BackendImpl::BackendImpl(
+    Sequence<Any> const & args,
+    Reference<XComponentContext> const & xComponentContext )
+    : t_helper( args, xComponentContext ),
+      m_xBasicLibTypeInfo( new Package::TypeInfo(
+                               "application/vnd.sun.star.basic-library",
+                               OUString() /* no file filter */,
+                               DpResId(RID_STR_BASIC_LIB)
+                               ) ),
+      m_xDialogLibTypeInfo( new Package::TypeInfo(
+                                "application/vnd.sun.star.dialog-library",
+                                OUString() /* no file filter */,
+                                DpResId(RID_STR_DIALOG_LIB)
+                                ) ),
+      m_typeInfos{ m_xBasicLibTypeInfo, m_xDialogLibTypeInfo }
+{
+    OSL_ASSERT( ! transientMode() );
+
+    if (!transientMode())
+    {
+        OUString dbFile = makeURL(getCachePath(), "backenddb.xml");
+        m_backendDb.reset(
+            new ScriptBackendDb(getComponentContext(), dbFile));
+    }
+
+}
+
+// XServiceInfo
+OUString BackendImpl::getImplementationName()
+{
+    return "com.sun.star.comp.deployment.script.PackageRegistryBackend";
+}
+
+sal_Bool BackendImpl::supportsService( const OUString& ServiceName )
+{
+    return cppu::supportsService(this, ServiceName);
+}
+
+css::uno::Sequence< OUString > BackendImpl::getSupportedServiceNames()
+{
+    return { BACKEND_SERVICE_NAME };
+}
+
+void BackendImpl::addDataToDb(OUString const & url)
+{
+    if (m_backendDb)
+        m_backendDb->addEntry(url);
+}
+
+bool BackendImpl::hasActiveEntry(std::u16string_view url)
+{
+    if (m_backendDb)
+        return m_backendDb->hasActiveEntry(url);
+    return false;
+}
+
+// XUpdatable
+
+void BackendImpl::update()
+{
+    // Nothing to do here after fixing i70283!?
+}
+
+// XPackageRegistry
+
+Sequence< Reference<deployment::XPackageTypeInfo> >
+BackendImpl::getSupportedPackageTypes()
+{
+    return m_typeInfos;
+}
+void BackendImpl::revokeEntryFromDb(std::u16string_view url)
+{
+    if (m_backendDb)
+        m_backendDb->revokeEntry(url);
+}
+
+void BackendImpl::packageRemoved(OUString const & url, OUString const & /*mediaType*/)
+{
+    if (m_backendDb)
+        m_backendDb->removeEntry(url);
+}
+
+// PackageRegistryBackend
+
+Reference<deployment::XPackage> BackendImpl::bindPackage_(
+    OUString const & url, OUString const & mediaType_,
+    bool bRemoved, OUString const & identifier,
+    Reference<XCommandEnvironment> const & xCmdEnv )
+{
+    OUString mediaType( mediaType_ );
+    if (mediaType.isEmpty())
+    {
+        // detect media-type:
+        ::ucbhelper::Content ucbContent;
+        if (create_ucb_content( &ucbContent, url, xCmdEnv ) &&
+            ucbContent.isFolder())
+        {
+            // probe for script.xlb:
+            if (create_ucb_content(
+                    nullptr, makeURL( url, "script.xlb" ),
+                    xCmdEnv, false /* no throw */ ))
+                mediaType = "application/vnd.sun.star.basic-library";
+            // probe for dialog.xlb:
+            else if (create_ucb_content(
+                         nullptr, makeURL( url, "dialog.xlb" ),
+                         xCmdEnv, false /* no throw */ ))
+                mediaType = "application/vnd.sun.star.dialog-library";
+        }
+        if (mediaType.isEmpty())
+            throw lang::IllegalArgumentException(
+                StrCannotDetectMediaType() + url,
+                static_cast<OWeakObject *>(this), static_cast<sal_Int16>(-1) );
+    }
+
+    OUString type, subType;
+    INetContentTypeParameterList params;
+    if (INetContentTypes::parse( mediaType, type, subType, &params ))
+    {
+        if (type.equalsIgnoreAsciiCase("application"))
+        {
+            OUString dialogURL( makeURL( url, "dialog.xlb" ) );
+            if (! create_ucb_content(
+                    nullptr, dialogURL, xCmdEnv, false /* no throw */ )) {
+                dialogURL.clear();
+            }
+
+            if (subType.equalsIgnoreAsciiCase("vnd.sun.star.basic-library"))
+            {
+                OUString scriptURL( makeURL( url, "script.xlb"));
+                if (! create_ucb_content(
+                        nullptr, scriptURL, xCmdEnv, false /* no throw */ )) {
+                    scriptURL.clear();
+                }
+
+                return new PackageImpl(
+                    this, url, xCmdEnv, scriptURL,
+                    dialogURL, bRemoved, identifier);
+            }
+            else if (subType.equalsIgnoreAsciiCase(
+                         "vnd.sun.star.dialog-library")) {
+                return new PackageImpl(
+                    this, url, xCmdEnv,
+                    OUString() /* no script lib */,
+                    dialogURL,
+                    bRemoved, identifier);
+            }
+        }
+    }
+    throw lang::IllegalArgumentException(
+        StrUnsupportedMediaType() + mediaType,
+        static_cast<OWeakObject *>(this),
+        static_cast<sal_Int16>(-1) );
+}
+
+
+// Package
+BackendImpl * BackendImpl::PackageImpl::getMyBackend() const
+{
+    BackendImpl * pBackend = static_cast<BackendImpl *>(m_myBackend.get());
+    if (nullptr == pBackend)
+    {
+        //May throw a DisposedException
+        check();
+        //We should never get here...
+        throw RuntimeException(
+            "Failed to get the BackendImpl",
+            static_cast<OWeakObject*>(const_cast<PackageImpl *>(this)));
+    }
+    return pBackend;
+}
+
+beans::Optional< beans::Ambiguous<sal_Bool> >
+BackendImpl::PackageImpl::isRegistered_(
+    ::osl::ResettableMutexGuard & /* guard */,
+    ::rtl::Reference<AbortChannel> const & /* abortChannel */,
+    Reference<XCommandEnvironment> const & /* xCmdEnv */ )
+{
+    BackendImpl * that = getMyBackend();
+    Reference< deployment::XPackage > xThisPackage( this );
+
+    bool registered = that->hasActiveEntry(getURL());
+    return beans::Optional< beans::Ambiguous<sal_Bool> >(
+        true /* IsPresent */,
+        beans::Ambiguous<sal_Bool>( registered, false /* IsAmbiguous */ ) );
+}
+
+void
+lcl_maybeRemoveScript(
+        bool const bExists,
+        OUString const& rName,
+        std::u16string_view rScriptURL,
+        Reference<css::script::XLibraryContainer3> const& xScriptLibs)
+{
+    if (bExists && xScriptLibs.is() && xScriptLibs->hasByName(rName))
+    {
+        const OUString sScriptUrl = xScriptLibs->getOriginalLibraryLinkURL(rName);
+        if (sScriptUrl == rScriptURL)
+            xScriptLibs->removeLibrary(rName);
+    }
+}
+
+bool
+lcl_maybeAddScript(
+        bool const bExists,
+        OUString const& rName,
+        OUString const& rScriptURL,
+        Reference<css::script::XLibraryContainer3> const& xScriptLibs)
+{
+    if (!bExists || !xScriptLibs)
+        return false;
+
+    bool bCanAdd = true;
+    if (xScriptLibs->hasByName(rName))
+    {
+        const OUString sOriginalUrl = xScriptLibs->getOriginalLibraryLinkURL(rName);
+        //We assume here that library names in extensions are unique, which may not be the case
+        //ToDo: If the script exist in another extension, then both extensions must have the
+        //same id
+        if (sOriginalUrl.match("vnd.sun.star.expand:$UNO_USER_PACKAGES_CACHE")
+            || sOriginalUrl.match("vnd.sun.star.expand:$UNO_SHARED_PACKAGES_CACHE")
+            || sOriginalUrl.match("vnd.sun.star.expand:$BUNDLED_EXTENSIONS")
+            || sOriginalUrl.match("$(INST)/share/basic/Access2Base/"))
+        {
+            xScriptLibs->removeLibrary(rName);
+            bCanAdd = true;
+        }
+        else
+        {
+            bCanAdd = false;
+        }
+    }
+
+    if (bCanAdd)
+    {
+        xScriptLibs->createLibraryLink(rName, rScriptURL, false);
+        return xScriptLibs->hasByName(rName);
+    }
+
+    return false;
+}
+
+void BackendImpl::PackageImpl::processPackage_(
+    ::osl::ResettableMutexGuard & /* guard */,
+    bool doRegisterPackage,
+    bool startup,
+    ::rtl::Reference<AbortChannel> const & /* abortChannel */,
+    Reference<XCommandEnvironment> const & /* xCmdEnv */ )
+{
+    BackendImpl * that = getMyBackend();
+
+    Reference< deployment::XPackage > xThisPackage( this );
+    Reference<XComponentContext> const & xComponentContext = that->getComponentContext();
+
+    bool bScript = !m_scriptURL.isEmpty();
+    Reference<css::script::XLibraryContainer3> xScriptLibs;
+
+    bool bDialog = !m_dialogURL.isEmpty();
+    Reference<css::script::XLibraryContainer3> xDialogLibs;
+
+    bool bRunning = !startup && office_is_running();
+    if( bRunning )
+    {
+        if( bScript )
+        {
+            xScriptLibs.set(
+                xComponentContext->getServiceManager()->createInstanceWithContext(
+                    "com.sun.star.script.ApplicationScriptLibraryContainer",
+                    xComponentContext ), UNO_QUERY_THROW );
+        }
+
+        if( bDialog )
+        {
+            xDialogLibs.set(
+                xComponentContext->getServiceManager()->createInstanceWithContext(
+                    "com.sun.star.script.ApplicationDialogLibraryContainer",
+                    xComponentContext ), UNO_QUERY_THROW );
+        }
+    }
+    bool bRegistered = getMyBackend()->hasActiveEntry(getURL());
+    if( !doRegisterPackage )
+    {
+        //We cannot just call removeLibrary(name) because this could remove a
+        //script which was added by an extension in a different repository. For
+        //example, extension foo is contained in the bundled repository and then
+        //the user adds it to the user repository. The extension manager will
+        //then register the new script and revoke the script from the bundled
+        //extension. removeLibrary(name) would now remove the script from the
+        //user repository. That is, the script of the newly added user extension does
+        //not work anymore. Therefore we must check if the currently active
+        //script comes in fact from the currently processed extension.
+
+        if (bRegistered)
+        {
+            //we also prevent and live deployment at startup
+            if (!isRemoved() && !startup)
+            {
+                lcl_maybeRemoveScript(bScript, m_name, m_scriptURL, xScriptLibs);
+                lcl_maybeRemoveScript(bDialog, m_dialogName, m_dialogURL, xDialogLibs);
+            }
+            getMyBackend()->revokeEntryFromDb(getURL());
+            return;
+        }
+    }
+    if (bRegistered)
+        return;     // Already registered
+
+    // Update LibraryContainer
+    bool bScriptSuccess = false;
+    bool bDialogSuccess = false;
+    if (!startup)
+    {
+        //If there is a bundled extension, and the user installs the same extension
+        //then the script from the bundled extension must be removed. If this does not work
+        //then live deployment does not work for scripts.
+        bScriptSuccess = lcl_maybeAddScript(bScript, m_name, m_scriptURL, xScriptLibs);
+        bDialogSuccess = lcl_maybeAddScript(bDialog, m_dialogName, m_dialogURL, xDialogLibs);
+    }
+    bool bSuccess = bScript || bDialog;     // Something must have happened
+    if( bRunning )
+        if( (bScript && !bScriptSuccess) || (bDialog && !bDialogSuccess) )
+            bSuccess = false;
+
+    if (bSuccess)
+        getMyBackend()->addDataToDb(getURL());
+}
+
+} // anon namespace
+
+} // namespace dp_registry::backend::script
+
+extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface*
+com_sun_star_comp_deployment_script_PackageRegistryBackend_get_implementation(
+    css::uno::XComponentContext* context, css::uno::Sequence<css::uno::Any> const& args)
+{
+    return cppu::acquire(new dp_registry::backend::script::BackendImpl(args, context));
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/desktop/source/deployment/registry/script/dp_scriptbackenddb.cxx b/desktop/source/deployment/registry/script/dp_scriptbackenddb.cxx
new file mode 100644
index 000000000..476f43953
--- /dev/null
+++ b/desktop/source/deployment/registry/script/dp_scriptbackenddb.cxx
@@ -0,0 +1,64 @@
+/* -*- 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 <com/sun/star/uno/XComponentContext.hpp>
+#include "dp_scriptbackenddb.hxx"
+
+
+using namespace ::com::sun::star::uno;
+
+constexpr OUStringLiteral EXTENSION_REG_NS = u"http://openoffice.org/extensionmanager/script-registry/2010";
+constexpr OUStringLiteral NS_PREFIX = u"script";
+constexpr OUStringLiteral ROOT_ELEMENT_NAME = u"script-backend-db";
+constexpr OUStringLiteral KEY_ELEMENT_NAME = u"script";
+
+namespace dp_registry::backend::script {
+
+ScriptBackendDb::ScriptBackendDb(
+    Reference<XComponentContext> const &  xContext,
+    OUString const & url):RegisteredDb(xContext, url)
+{
+
+}
+
+OUString ScriptBackendDb::getDbNSName()
+{
+    return EXTENSION_REG_NS;
+}
+
+OUString ScriptBackendDb::getNSPrefix()
+{
+    return NS_PREFIX;
+}
+
+OUString ScriptBackendDb::getRootElementName()
+{
+    return ROOT_ELEMENT_NAME;
+}
+
+OUString ScriptBackendDb::getKeyElementName()
+{
+    return KEY_ELEMENT_NAME;
+}
+
+
+} // namespace dp_registry::backend::script
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/desktop/source/deployment/registry/script/dp_scriptbackenddb.hxx b/desktop/source/deployment/registry/script/dp_scriptbackenddb.hxx
new file mode 100644
index 000000000..21d4b1f6b
--- /dev/null
+++ b/desktop/source/deployment/registry/script/dp_scriptbackenddb.hxx
@@ -0,0 +1,55 @@
+/* -*- 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 .
+ */
+
+#pragma once
+
+#include <rtl/ustring.hxx>
+#include <dp_backenddb.hxx>
+#include <optional>
+
+namespace com::sun::star::uno { class XComponentContext; }
+
+namespace dp_registry::backend::script {
+
+/* The XML file stores the extensions which are currently registered.
+   They will be removed when they are revoked.
+ */
+class ScriptBackendDb: public dp_registry::backend::RegisteredDb
+{
+protected:
+    virtual OUString getDbNSName() override;
+
+    virtual OUString getNSPrefix() override;
+
+    virtual OUString getRootElementName() override;
+
+    virtual OUString getKeyElementName() override;
+
+
+public:
+
+    ScriptBackendDb( css::uno::Reference<css::uno::XComponentContext> const &  xContext,
+                        OUString const & url);
+};
+
+
+}
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/desktop/source/deployment/registry/sfwk/dp_parceldesc.cxx b/desktop/source/deployment/registry/sfwk/dp_parceldesc.cxx
new file mode 100644
index 000000000..530924a07
--- /dev/null
+++ b/desktop/source/deployment/registry/sfwk/dp_parceldesc.cxx
@@ -0,0 +1,103 @@
+/* -*- 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 <dp_misc.h>
+#include "dp_parceldesc.hxx"
+
+
+using namespace ::com::sun::star;
+using namespace ::com::sun::star::uno;
+
+
+namespace dp_registry::backend::sfwk
+{
+
+
+// XDocumentHandler
+void SAL_CALL
+ParcelDescDocHandler::startDocument()
+{
+    m_bIsParsed = false;
+}
+
+void SAL_CALL
+ParcelDescDocHandler::endDocument()
+{
+    m_bIsParsed = true;
+}
+
+void SAL_CALL
+ParcelDescDocHandler::characters( const OUString & )
+{
+}
+
+void SAL_CALL
+ParcelDescDocHandler::ignorableWhitespace( const OUString & )
+{
+}
+
+void SAL_CALL
+ParcelDescDocHandler::processingInstruction(
+    const OUString &, const OUString & )
+{
+}
+
+void SAL_CALL
+ParcelDescDocHandler::setDocumentLocator(
+    const Reference< xml::sax::XLocator >& )
+{
+}
+
+void SAL_CALL
+ParcelDescDocHandler::startElement( const OUString& aName,
+    const Reference< xml::sax::XAttributeList > & xAttribs )
+{
+
+    dp_misc::TRACE("ParcelDescDocHandler::startElement() for " +
+        aName + "\n");
+    if ( !skipIndex )
+    {
+        if ( aName == "parcel" )
+        {
+            m_sLang = xAttribs->getValueByName( "language" );
+        }
+        ++skipIndex;
+    }
+    else
+    {
+        dp_misc::TRACE("ParcelDescDocHandler::startElement() skipping for "
+            + aName + "\n");
+    }
+
+}
+
+void SAL_CALL ParcelDescDocHandler::endElement( const OUString & aName )
+{
+    if ( skipIndex )
+    {
+        --skipIndex;
+        dp_misc::TRACE("ParcelDescDocHandler::endElement() skipping for "
+            + aName + "\n");
+    }
+}
+
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/desktop/source/deployment/registry/sfwk/dp_parceldesc.hxx b/desktop/source/deployment/registry/sfwk/dp_parceldesc.hxx
new file mode 100644
index 000000000..6b5bde8bd
--- /dev/null
+++ b/desktop/source/deployment/registry/sfwk/dp_parceldesc.hxx
@@ -0,0 +1,64 @@
+/* -*- 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 .
+ */
+
+#pragma once
+
+#include <cppuhelper/implbase.hxx>
+
+#include <com/sun/star/xml/sax/XAttributeList.hpp>
+#include <com/sun/star/xml/sax/XDocumentHandler.hpp>
+
+namespace dp_registry::backend::sfwk
+{
+
+class ParcelDescDocHandler : public ::cppu::WeakImplHelper< css::xml::sax::XDocumentHandler >
+{
+private:
+    bool m_bIsParsed;
+    OUString m_sLang;
+    sal_Int32 skipIndex;
+public:
+    ParcelDescDocHandler():m_bIsParsed( false ), skipIndex( 0 ){}
+    const OUString& getParcelLanguage() const { return m_sLang; }
+    bool isParsed() const { return m_bIsParsed; }
+    // XDocumentHandler
+    virtual void SAL_CALL startDocument() override;
+
+    virtual void SAL_CALL endDocument() override;
+
+    virtual void SAL_CALL startElement( const OUString& aName,
+        const css::uno::Reference< css::xml::sax::XAttributeList > & xAttribs ) override;
+
+    virtual void SAL_CALL endElement( const OUString & aName ) override;
+
+    virtual void SAL_CALL characters( const OUString & aChars ) override;
+
+    virtual void SAL_CALL ignorableWhitespace( const OUString & aWhitespaces ) override;
+
+    virtual void SAL_CALL processingInstruction(
+        const OUString & aTarget, const OUString & aData ) override;
+
+    virtual void SAL_CALL setDocumentLocator(
+        const css::uno::Reference< css::xml::sax::XLocator >& xLocator ) override;
+};
+}
+
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/desktop/source/deployment/registry/sfwk/dp_sfwk.cxx b/desktop/source/deployment/registry/sfwk/dp_sfwk.cxx
new file mode 100644
index 000000000..b617d7fa4
--- /dev/null
+++ b/desktop/source/deployment/registry/sfwk/dp_sfwk.cxx
@@ -0,0 +1,378 @@
+/* -*- 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 <sal/config.h>
+
+#include <strings.hrc>
+#include <dp_backend.h>
+#include <dp_misc.h>
+#include <dp_ucb.h>
+#include "dp_parceldesc.hxx"
+#include <rtl/uri.hxx>
+#include <ucbhelper/content.hxx>
+#include <svl/inettype.hxx>
+#include <com/sun/star/container/XNameContainer.hpp>
+#include <com/sun/star/script/provider/theMasterScriptProviderFactory.hpp>
+#include <com/sun/star/xml/sax/Parser.hpp>
+#include <cppuhelper/supportsservice.hxx>
+#include <utility>
+
+
+using namespace ::dp_misc;
+using namespace ::com::sun::star;
+using namespace ::com::sun::star::uno;
+using namespace ::com::sun::star::ucb;
+using namespace ::com::sun::star::script;
+
+
+namespace dp_registry::backend::sfwk
+{
+
+namespace {
+
+class BackendImpl : public ::dp_registry::backend::PackageRegistryBackend
+{
+    class PackageImpl : public ::dp_registry::backend::Package
+    {
+        BackendImpl * getMyBackend() const;
+
+        Reference< container::XNameContainer > m_xNameCntrPkgHandler;
+        OUString m_descr;
+
+        void initPackageHandler();
+
+        // Package
+        virtual beans::Optional< beans::Ambiguous<sal_Bool> > isRegistered_(
+            ::osl::ResettableMutexGuard & guard,
+            ::rtl::Reference<AbortChannel> const & abortChannel,
+            Reference<XCommandEnvironment> const & xCmdEnv ) override;
+        virtual void processPackage_(
+            ::osl::ResettableMutexGuard & guard,
+            bool registerPackage,
+            bool startup,
+            ::rtl::Reference<AbortChannel> const & abortChannel,
+            Reference<XCommandEnvironment> const & xCmdEnv ) override;
+
+    public:
+        PackageImpl(
+            ::rtl::Reference<BackendImpl> const & myBackend,
+            OUString const & url, OUString libType, bool bRemoved,
+            OUString const & identifier);
+        // XPackage
+        virtual OUString SAL_CALL getDescription() override;
+        virtual OUString SAL_CALL getLicenseText() override;
+    };
+    friend class PackageImpl;
+
+    // PackageRegistryBackend
+    virtual Reference<deployment::XPackage> bindPackage_(
+        OUString const & url, OUString const & mediaType,
+        bool bRemoved, OUString const & identifier,
+        Reference<XCommandEnvironment> const & xCmdEnv ) override;
+
+    const Reference<deployment::XPackageTypeInfo> m_xTypeInfo;
+
+
+public:
+    BackendImpl(
+        Sequence<Any> const & args,
+        Reference<XComponentContext> const & xComponentContext );
+
+    // XServiceInfo
+    virtual OUString SAL_CALL getImplementationName() override;
+    virtual sal_Bool SAL_CALL supportsService( const OUString& ServiceName ) override;
+    virtual css::uno::Sequence< OUString > SAL_CALL getSupportedServiceNames() override;
+
+    // XPackageRegistry
+    virtual Sequence< Reference<deployment::XPackageTypeInfo> > SAL_CALL
+    getSupportedPackageTypes() override;
+    virtual void SAL_CALL packageRemoved(OUString const & url, OUString const & mediaType) override;
+};
+
+}
+
+BackendImpl * BackendImpl::PackageImpl::getMyBackend() const
+{
+    BackendImpl * pBackend = static_cast<BackendImpl *>(m_myBackend.get());
+    if (nullptr == pBackend)
+    {
+        //May throw a DisposedException
+        check();
+        //We should never get here...
+        throw RuntimeException("Failed to get the BackendImpl",
+            static_cast<OWeakObject*>(const_cast<PackageImpl *>(this)));
+    }
+    return pBackend;
+}
+
+OUString BackendImpl::PackageImpl::getDescription()
+{
+    if (m_descr.isEmpty())
+        return Package::getDescription();
+    else
+        return m_descr;
+}
+
+OUString BackendImpl::PackageImpl::getLicenseText()
+{
+    return Package::getDescription();
+}
+
+BackendImpl::PackageImpl::PackageImpl(
+    ::rtl::Reference<BackendImpl> const & myBackend,
+    OUString const & url, OUString  libType, bool bRemoved,
+    OUString const & identifier)
+    : Package( myBackend, url, OUString(), OUString(),
+               myBackend->m_xTypeInfo, bRemoved, identifier),
+      m_descr(std::move(libType))
+{
+    initPackageHandler();
+
+    sal_Int32 segmEnd = url.getLength();
+    if ( url.endsWith("/") )
+        --segmEnd;
+    sal_Int32 segmStart = url.lastIndexOf( '/', segmEnd ) + 1;
+    if (segmStart < 0)
+        segmStart = 0;
+    // name and display name default the same:
+    m_displayName = ::rtl::Uri::decode(
+        url.copy( segmStart, segmEnd - segmStart ),
+        rtl_UriDecodeWithCharset, RTL_TEXTENCODING_UTF8 );
+    m_name = m_displayName;
+
+    dp_misc::TRACE("PackageImpl displayName is " + m_displayName);
+}
+
+
+BackendImpl::BackendImpl(
+    Sequence<Any> const & args,
+    Reference<XComponentContext> const & xComponentContext )
+    : PackageRegistryBackend( args, xComponentContext ),
+      m_xTypeInfo( new Package::TypeInfo(
+                       "application/vnd.sun.star.framework-script",
+                       OUString() /* no file filter */,
+                       "Scripting Framework Script Library"
+                       ) )
+{
+}
+
+
+// XServiceInfo
+OUString BackendImpl::getImplementationName()
+{
+    return "com.sun.star.comp.deployment.sfwk.PackageRegistryBackend";
+}
+
+sal_Bool BackendImpl::supportsService( const OUString& ServiceName )
+{
+    return cppu::supportsService(this, ServiceName);
+}
+
+css::uno::Sequence< OUString > BackendImpl::getSupportedServiceNames()
+{
+    return { BACKEND_SERVICE_NAME };
+}
+
+// XPackageRegistry
+
+Sequence< Reference<deployment::XPackageTypeInfo> >
+BackendImpl::getSupportedPackageTypes()
+{
+    return Sequence< Reference<deployment::XPackageTypeInfo> >(&m_xTypeInfo, 1);
+}
+
+void BackendImpl::packageRemoved(OUString const & /*url*/, OUString const & /*mediaType*/)
+{
+}
+
+// PackageRegistryBackend
+
+Reference<deployment::XPackage> BackendImpl::bindPackage_(
+    OUString const & url, OUString const & mediaType_, bool bRemoved,
+    OUString const & identifier, Reference<XCommandEnvironment> const & xCmdEnv )
+{
+    OUString mediaType( mediaType_ );
+    if (mediaType.isEmpty())
+    {
+        // detect media-type:
+        ::ucbhelper::Content ucbContent;
+        if (create_ucb_content( &ucbContent, url, xCmdEnv ) &&
+            ucbContent.isFolder())
+        {
+            // probe for parcel-descriptor.xml:
+            if (create_ucb_content(
+                    nullptr, makeURL( url, "parcel-descriptor.xml" ),
+                    xCmdEnv, false /* no throw */ ))
+            {
+                mediaType = "application/vnd.sun.star.framework-script";
+            }
+        }
+        if (mediaType.isEmpty())
+            throw lang::IllegalArgumentException(
+                StrCannotDetectMediaType() + url,
+                static_cast<OWeakObject *>(this), static_cast<sal_Int16>(-1) );
+    }
+
+    OUString type, subType;
+    INetContentTypeParameterList params;
+    if (INetContentTypes::parse( mediaType, type, subType, &params ))
+    {
+        if (type.equalsIgnoreAsciiCase("application"))
+        {
+            if (subType.equalsIgnoreAsciiCase("vnd.sun.star.framework-script"))
+            {
+                OUString lang = "Script";
+                OUString sParcelDescURL = makeURL(
+                    url, "parcel-descriptor.xml" );
+
+                ::ucbhelper::Content ucb_content;
+
+                if (create_ucb_content( &ucb_content, sParcelDescURL,
+                        xCmdEnv, false /* no throw */ ))
+                {
+                    rtl::Reference<ParcelDescDocHandler> pHandler =
+                        new ParcelDescDocHandler();
+
+                    Reference<XComponentContext>
+                        xContext( getComponentContext() );
+
+                    Reference< xml::sax::XParser > xParser = xml::sax::Parser::create(xContext);
+
+                    xParser->setDocumentHandler( pHandler );
+                    xml::sax::InputSource source;
+                    source.aInputStream = ucb_content.openStream();
+                    source.sSystemId = ucb_content.getURL();
+                    xParser->parseStream( source );
+
+                    if ( pHandler->isParsed() )
+                    {
+                        lang = pHandler->getParcelLanguage();
+                    }
+                }
+
+                OUString sfwkLibType = DpResId( RID_STR_SFWK_LIB );
+                // replace %MACRONAME placeholder with language name
+                OUString MACRONAME( "%MACROLANG" );
+                sal_Int32 startOfReplace = sfwkLibType.indexOf( MACRONAME );
+                sal_Int32 charsToReplace = MACRONAME.getLength();
+                sfwkLibType = sfwkLibType.replaceAt( startOfReplace, charsToReplace, lang );
+                dp_misc::TRACE("******************************\n");
+                dp_misc::TRACE(" BackEnd detected lang = " + lang + "\n");
+                dp_misc::TRACE(" for url " + sParcelDescURL + "\n");
+                dp_misc::TRACE("******************************\n");
+                return new PackageImpl( this, url, sfwkLibType, bRemoved, identifier);
+            }
+        }
+    }
+    throw lang::IllegalArgumentException(
+        StrUnsupportedMediaType() + mediaType,
+        static_cast<OWeakObject *>(this),
+        static_cast<sal_Int16>(-1) );
+}
+
+
+void BackendImpl::PackageImpl:: initPackageHandler()
+{
+    if (m_xNameCntrPkgHandler.is())
+        return;
+
+    BackendImpl * that = getMyBackend();
+    Any aContext;
+
+    if ( that->m_eContext == Context::User )
+    {
+        aContext  <<= OUString("user");
+    }
+    else if ( that->m_eContext == Context::Shared )
+    {
+        aContext  <<= OUString("share");
+    }
+    else if ( that->m_eContext == Context::Bundled )
+    {
+        aContext  <<= OUString("bundled");
+    }
+    else
+    {
+        OSL_ASSERT( false );
+        // NOT supported at the moment // TODO
+    }
+
+    Reference< provider::XScriptProviderFactory > xFac =
+        provider::theMasterScriptProviderFactory::get( that->getComponentContext() );
+
+    Reference< container::XNameContainer > xName( xFac->createScriptProvider( aContext ), UNO_QUERY );
+    if ( xName.is() )
+    {
+        m_xNameCntrPkgHandler.set( xName );
+    }
+    // TODO what happens if above fails??
+}
+
+// Package
+
+beans::Optional< beans::Ambiguous<sal_Bool> >
+BackendImpl::PackageImpl::isRegistered_(
+    ::osl::ResettableMutexGuard &,
+    ::rtl::Reference<AbortChannel> const &,
+    Reference<XCommandEnvironment> const & )
+{
+    return beans::Optional< beans::Ambiguous<sal_Bool> >(
+        true /* IsPresent */,
+        beans::Ambiguous<sal_Bool>(
+            m_xNameCntrPkgHandler.is() && m_xNameCntrPkgHandler->hasByName(
+                m_url ),
+            false /* IsAmbiguous */ ) );
+}
+
+
+void BackendImpl::PackageImpl::processPackage_(
+    ::osl::ResettableMutexGuard &,
+    bool doRegisterPackage,
+    bool /* startup */,
+    ::rtl::Reference<AbortChannel> const &,
+    Reference<XCommandEnvironment> const & )
+{
+    if ( !m_xNameCntrPkgHandler.is() )
+    {
+        dp_misc::TRACE("no package handler!!!!\n");
+        throw RuntimeException( "No package Handler " );
+    }
+
+    if (doRegisterPackage)
+    {
+        // will throw if it fails
+        m_xNameCntrPkgHandler->insertByName( m_url, Any( Reference< XPackage >(this) ) );
+
+    }
+    else // revokePackage()
+    {
+        m_xNameCntrPkgHandler->removeByName( m_url );
+    }
+}
+
+} // namespace dp_registry::backend::sfwk
+
+extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface*
+com_sun_star_comp_deployment_sfwk_PackageRegistryBackend_get_implementation(
+    css::uno::XComponentContext* context, css::uno::Sequence<css::uno::Any> const& args)
+{
+    return cppu::acquire(new dp_registry::backend::sfwk::BackendImpl(args, context));
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */