libreoffice/comphelper/source/misc/configuration.cxx

/* -*- 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/.
 */

#include <sal/config.h>

#include <cassert>
#include <map>
#include <memory>
#include <mutex>
#include <string_view>

#include <com/sun/star/beans/PropertyAttribute.hpp>
#include <com/sun/star/configuration/ReadOnlyAccess.hpp>
#include <com/sun/star/configuration/ReadWriteAccess.hpp>
#include <com/sun/star/configuration/XReadWriteAccess.hpp>
#include <com/sun/star/configuration/theDefaultProvider.hpp>
#include <com/sun/star/container/XHierarchicalNameAccess.hpp>
#include <com/sun/star/container/XHierarchicalNameReplace.hpp>
#include <com/sun/star/container/XNameAccess.hpp>
#include <com/sun/star/container/XNameContainer.hpp>
#include <com/sun/star/lang/XLocalizable.hpp>
#include <com/sun/star/uno/Any.hxx>
#include <com/sun/star/uno/Reference.hxx>
#include <comphelper/solarmutex.hxx>
#include <comphelper/configuration.hxx>
#include <comphelper/configurationlistener.hxx>
#include <rtl/ustring.hxx>
#include <sal/log.hxx>
#include <i18nlangtag/languagetag.hxx>

namespace com::sun::star::uno { class XComponentContext; }

namespace {

OUString getDefaultLocale(
    css::uno::Reference< css::uno::XComponentContext > const & context)
{
    return LanguageTag(
        css::uno::Reference< css::lang::XLocalizable >(
            css::configuration::theDefaultProvider::get(context),
            css::uno::UNO_QUERY_THROW)->
        getLocale()).getBcp47(false);
}

OUString extendLocalizedPath(std::u16string_view path, OUString const & locale) {
    SAL_WARN_IF(
        locale.match("*"), "comphelper",
        "Locale \"" << locale << "\" starts with \"*\"");
    assert(locale.indexOf('&') == -1);
    assert(locale.indexOf('"') == -1);
    assert(locale.indexOf('\'') == -1);
    return OUString::Concat(path) + "/['*" + locale + "']";
}

}

std::shared_ptr< comphelper::ConfigurationChanges >
comphelper::ConfigurationChanges::create(
    css::uno::Reference<css::uno::XComponentContext> const & context)
{
    return detail::ConfigurationWrapper::get(context).createChanges();
}

comphelper::ConfigurationChanges::~ConfigurationChanges() {}

void comphelper::ConfigurationChanges::commit() const {
    access_->commitChanges();
}

comphelper::ConfigurationChanges::ConfigurationChanges(
    css::uno::Reference< css::uno::XComponentContext > const & context):
    access_(
        css::configuration::ReadWriteAccess::create(
            context, getDefaultLocale(context)))
{}

void comphelper::ConfigurationChanges::setPropertyValue(
    OUString const & path, css::uno::Any const & value) const
{
    access_->replaceByHierarchicalName(path, value);
}

css::uno::Reference< css::container::XHierarchicalNameReplace >
comphelper::ConfigurationChanges::getGroup(OUString const & path) const
{
    return css::uno::Reference< css::container::XHierarchicalNameReplace >(
        access_->getByHierarchicalName(path), css::uno::UNO_QUERY_THROW);
}

css::uno::Reference< css::container::XNameContainer >
comphelper::ConfigurationChanges::getSet(OUString const & path) const
{
    return css::uno::Reference< css::container::XNameContainer >(
        access_->getByHierarchicalName(path), css::uno::UNO_QUERY_THROW);
}

comphelper::detail::ConfigurationWrapper const &
comphelper::detail::ConfigurationWrapper::get(
    css::uno::Reference<css::uno::XComponentContext> const & context)
{
    static comphelper::detail::ConfigurationWrapper WRAPPER(context);
    return WRAPPER;
}

comphelper::detail::ConfigurationWrapper::ConfigurationWrapper(
    css::uno::Reference<css::uno::XComponentContext> const & context):
    context_(context.is() ? context : comphelper::getProcessComponentContext()),
    access_(css::configuration::ReadWriteAccess::create(context_, u"*"_ustr))
{}

comphelper::detail::ConfigurationWrapper::~ConfigurationWrapper() {}

bool comphelper::detail::ConfigurationWrapper::isReadOnly(OUString const & path)
    const
{
    return
        (access_->getPropertyByHierarchicalName(path).Attributes
         & css::beans::PropertyAttribute::READONLY)
        != 0;
}

css::uno::Any comphelper::detail::ConfigurationWrapper::getPropertyValue(std::u16string_view path) const
{
    // should be short-circuited in ConfigurationProperty::get()
    assert(!comphelper::IsFuzzing());

    // Cache the configuration access, since some of the keys are used in hot code.
    // Note that this cache is only used by the officecfg:: auto-generated code, using it for anything
    // else would be unwise because the cache could end up containing stale entries.
    static std::mutex gMutex;
    static std::map<OUString, css::uno::Reference< css::container::XNameAccess >> gAccessMap;

    sal_Int32 idx = path.rfind('/');
    assert(idx!=-1);
    OUString parentPath(path.substr(0, idx));
    OUString childName(path.substr(idx+1));

    std::scoped_lock aGuard(gMutex);

    // check cache
    auto it = gAccessMap.find(parentPath);
    if (it == gAccessMap.end())
    {
        // not in the cache, look it up
        css::uno::Reference<css::container::XNameAccess> access(
            access_->getByHierarchicalName(parentPath), css::uno::UNO_QUERY_THROW);
        it = gAccessMap.emplace(parentPath, access).first;
    }
    return it->second->getByName(childName);
}

void comphelper::detail::ConfigurationWrapper::setPropertyValue(
    std::shared_ptr< ConfigurationChanges > const & batch,
    OUString const & path, css::uno::Any const & value)
{
    assert(batch);
    batch->setPropertyValue(path, value);
}

css::uno::Any
comphelper::detail::ConfigurationWrapper::getLocalizedPropertyValue(
    std::u16string_view path) const
{
    return access_->getByHierarchicalName(
        extendLocalizedPath(path, getDefaultLocale(context_)));
}

void comphelper::detail::ConfigurationWrapper::setLocalizedPropertyValue(
    std::shared_ptr< ConfigurationChanges > const & batch,
    OUString const & path, css::uno::Any const & value)
{
    assert(batch);
    batch->setPropertyValue(path, value);
}

css::uno::Reference< css::container::XHierarchicalNameAccess >
comphelper::detail::ConfigurationWrapper::getGroupReadOnly(
    OUString const & path) const
{
    return css::uno::Reference< css::container::XHierarchicalNameAccess >(
        (css::configuration::ReadOnlyAccess::create(
            context_, getDefaultLocale(context_))->
         getByHierarchicalName(path)),
        css::uno::UNO_QUERY_THROW);
}

css::uno::Reference< css::container::XHierarchicalNameReplace >
comphelper::detail::ConfigurationWrapper::getGroupReadWrite(
    std::shared_ptr< ConfigurationChanges > const & batch,
    OUString const & path)
{
    assert(batch);
    return batch->getGroup(path);
}

css::uno::Reference< css::container::XNameAccess >
comphelper::detail::ConfigurationWrapper::getSetReadOnly(
    OUString const & path) const
{
    return css::uno::Reference< css::container::XNameAccess >(
        (css::configuration::ReadOnlyAccess::create(
            context_, getDefaultLocale(context_))->
         getByHierarchicalName(path)),
        css::uno::UNO_QUERY_THROW);
}

css::uno::Reference< css::container::XNameContainer >
comphelper::detail::ConfigurationWrapper::getSetReadWrite(
    std::shared_ptr< ConfigurationChanges > const & batch,
    OUString const & path)
{
    assert(batch);
    return batch->getSet(path);
}

std::shared_ptr< comphelper::ConfigurationChanges >
comphelper::detail::ConfigurationWrapper::createChanges() const {
    return std::shared_ptr< ConfigurationChanges >(
        new ConfigurationChanges(context_));
}

void comphelper::ConfigurationListener::addListener(ConfigurationListenerPropertyBase *pListener)
{
    maListeners.push_back( pListener );
    mxConfig->addPropertyChangeListener( pListener->maName, this );
    pListener->setProperty( mxConfig->getPropertyValue( pListener->maName ) );
}

void comphelper::ConfigurationListener::removeListener(ConfigurationListenerPropertyBase *pListener)
{
    auto it = std::find( maListeners.begin(), maListeners.end(), pListener );
    if ( it != maListeners.end() )
    {
        maListeners.erase( it );
        mxConfig->removePropertyChangeListener( pListener->maName, this );
    }
}

void comphelper::ConfigurationListener::dispose()
{
    for (auto const& listener : maListeners)
    {
        mxConfig->removePropertyChangeListener( listener->maName, this );
        listener->dispose();
    }
    maListeners.clear();
    mxConfig.clear();
    mbDisposed = true;
}

void SAL_CALL comphelper::ConfigurationListener::disposing(css::lang::EventObject const &)
{
    dispose();
}

void SAL_CALL comphelper::ConfigurationListener::propertyChange(
    css::beans::PropertyChangeEvent const &rEvt )
{
    // Code is commonly used inside the SolarMutexGuard
    // so to avoid concurrent writes to the property,
    // and allow fast, lock-less access, guard here.
    //
    // Note that we are abusing rtl::Reference here to do acquire/release because,
    // unlike osl::Guard, it is tolerant of null pointers, and on some code paths, the
    // SolarMutex does not exist.
    rtl::Reference<comphelper::SolarMutex> xMutexGuard( comphelper::SolarMutex::get() );

    assert( rEvt.Source == mxConfig );
    for (auto const& listener : maListeners)
    {
        if ( listener->maName == rEvt.PropertyName )
        {
            // ignore rEvt.NewValue - in theory it could be stale => not set.
            css::uno::Any aValue = mxConfig->getPropertyValue( listener->maName );
            listener->setProperty( aValue );
        }
    }
}

namespace comphelper {

static bool bIsFuzzing = false;

#if !defined(FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION)
bool IsFuzzing()
{
    return bIsFuzzing;
}
#endif

void EnableFuzzing()
{
    bIsFuzzing = true;
    LanguageTag::disable_lt_tag_parse();
}

}

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