1 files changed, 223 insertions, 0 deletions
diff --git a/svl/source/misc/documentlockfile.cxx b/svl/source/misc/documentlockfile.cxx
new file mode 100644
index 000000000..09d67a9e5
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+++ b/svl/source/misc/documentlockfile.cxx
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+/* -*- 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/ucb/XCommandEnvironment.hpp>
+#include <com/sun/star/ucb/InsertCommandArgument.hpp>
+#include <com/sun/star/ucb/NameClashException.hpp>
+#include <com/sun/star/io/WrongFormatException.hpp>
+#include <com/sun/star/io/TempFile.hpp>
+#include <com/sun/star/io/XStream.hpp>
+#include <com/sun/star/io/XInputStream.hpp>
+#include <com/sun/star/io/XOutputStream.hpp>
+#include <com/sun/star/io/XSeekable.hpp>
+#include <com/sun/star/io/XTruncate.hpp>
+
+#include <o3tl/enumrange.hxx>
+
+#include <rtl/string.hxx>
+#include <rtl/ustring.hxx>
+#include <rtl/ustrbuf.hxx>
+
+#include <comphelper/processfactory.hxx>
+
+#include <ucbhelper/content.hxx>
+
+#include <svl/documentlockfile.hxx>
+
+using namespace ::com::sun::star;
+
+namespace svt {
+
+GenDocumentLockFile::GenDocumentLockFile(const OUString& aLockFileURL)
+    : LockFileCommon(aLockFileURL)
+{
+}
+
+
+GenDocumentLockFile::~GenDocumentLockFile()
+{
+}
+
+uno::Reference< io::XInputStream > GenDocumentLockFile::OpenStream()
+{
+    ::osl::MutexGuard aGuard( m_aMutex );
+
+    uno::Reference < css::ucb::XCommandEnvironment > xEnv;
+    ::ucbhelper::Content aSourceContent( GetURL(), xEnv, comphelper::getProcessComponentContext() );
+
+    // the file can be opened readonly, no locking will be done
+    return aSourceContent.openStream();
+}
+
+bool GenDocumentLockFile::CreateOwnLockFile()
+{
+    ::osl::MutexGuard aGuard( m_aMutex );
+
+    try
+    {
+        uno::Reference< io::XStream > xTempFile(
+            io::TempFile::create( comphelper::getProcessComponentContext() ),
+            uno::UNO_QUERY_THROW );
+        uno::Reference< io::XSeekable > xSeekable( xTempFile, uno::UNO_QUERY_THROW );
+
+        uno::Reference< io::XInputStream > xInput = xTempFile->getInputStream();
+        uno::Reference< io::XOutputStream > xOutput = xTempFile->getOutputStream();
+
+        if ( !xInput.is() || !xOutput.is() )
+            throw uno::RuntimeException();
+
+        LockFileEntry aNewEntry = GenerateOwnEntry();
+        WriteEntryToStream( aNewEntry, xOutput );
+        xOutput->closeOutput();
+
+        xSeekable->seek( 0 );
+
+        uno::Reference < css::ucb::XCommandEnvironment > xEnv;
+        ::ucbhelper::Content aTargetContent( GetURL(), xEnv, comphelper::getProcessComponentContext() );
+
+        ucb::InsertCommandArgument aInsertArg;
+        aInsertArg.Data = xInput;
+        aInsertArg.ReplaceExisting = false;
+        uno::Any aCmdArg;
+        aCmdArg <<= aInsertArg;
+        aTargetContent.executeCommand( "insert", aCmdArg );
+
+        // try to let the file be hidden if possible
+        try {
+            aTargetContent.setPropertyValue("IsHidden", uno::Any( true ) );
+        } catch( uno::Exception& ) {}
+    }
+    catch( ucb::NameClashException& )
+    {
+        return false;
+    }
+
+    return true;
+}
+
+bool GenDocumentLockFile::OverwriteOwnLockFile()
+{
+    // allows to overwrite the lock file with the current data
+    try
+    {
+        uno::Reference < css::ucb::XCommandEnvironment > xEnv;
+        ::ucbhelper::Content aTargetContent( GetURL(), xEnv, comphelper::getProcessComponentContext() );
+
+        LockFileEntry aNewEntry = GenerateOwnEntry();
+
+        uno::Reference< io::XStream > xStream = aTargetContent.openWriteableStreamNoLock();
+        uno::Reference< io::XOutputStream > xOutput = xStream->getOutputStream();
+        uno::Reference< io::XTruncate > xTruncate( xOutput, uno::UNO_QUERY_THROW );
+
+        xTruncate->truncate();
+        WriteEntryToStream( aNewEntry, xOutput );
+        xOutput->closeOutput();
+    }
+    catch( uno::Exception& )
+    {
+        return false;
+    }
+
+    return true;
+}
+
+void GenDocumentLockFile::RemoveFile()
+{
+    ::osl::MutexGuard aGuard( m_aMutex );
+
+    // TODO/LATER: the removing is not atomic, is it possible in general to make it atomic?
+    LockFileEntry aNewEntry = GenerateOwnEntry();
+    LockFileEntry aFileData = GetLockData();
+
+    if ( aFileData[LockFileComponent::SYSUSERNAME] != aNewEntry[LockFileComponent::SYSUSERNAME]
+      || aFileData[LockFileComponent::LOCALHOST] != aNewEntry[LockFileComponent::LOCALHOST]
+      || aFileData[LockFileComponent::USERURL] != aNewEntry[LockFileComponent::USERURL] )
+        throw io::IOException(); // not the owner, access denied
+
+    RemoveFileDirectly();
+}
+
+void GenDocumentLockFile::RemoveFileDirectly()
+{
+    uno::Reference < css::ucb::XCommandEnvironment > xEnv;
+    ::ucbhelper::Content aCnt(GetURL(), xEnv, comphelper::getProcessComponentContext());
+    aCnt.executeCommand("delete",
+        uno::Any(true));
+}
+
+
+DocumentLockFile::DocumentLockFile( std::u16string_view aOrigURL )
+    : GenDocumentLockFile(GenerateOwnLockFileURL(aOrigURL, u".~lock."))
+{
+}
+
+
+DocumentLockFile::~DocumentLockFile()
+{
+}
+
+
+void DocumentLockFile::WriteEntryToStream( const LockFileEntry& aEntry, const uno::Reference< io::XOutputStream >& xOutput )
+{
+    ::osl::MutexGuard aGuard( m_aMutex );
+
+    OUStringBuffer aBuffer(256);
+
+    for ( LockFileComponent lft : o3tl::enumrange<LockFileComponent>() )
+    {
+        aBuffer.append( EscapeCharacters( aEntry[lft] ) );
+        if ( lft < LockFileComponent::LAST )
+            aBuffer.append( ',' );
+        else
+            aBuffer.append( ';' );
+    }
+
+    OString aStringData( OUStringToOString( aBuffer.makeStringAndClear(), RTL_TEXTENCODING_UTF8 ) );
+    uno::Sequence< sal_Int8 > aData( reinterpret_cast<sal_Int8 const *>(aStringData.getStr()), aStringData.getLength() );
+    xOutput->writeBytes( aData );
+}
+
+LockFileEntry DocumentLockFile::GetLockData()
+{
+    ::osl::MutexGuard aGuard( m_aMutex );
+
+    uno::Reference< io::XInputStream > xInput = OpenStream();
+    if ( !xInput.is() )
+        throw uno::RuntimeException();
+
+    const sal_Int32 nBufLen = 32000;
+    uno::Sequence< sal_Int8 > aBuffer( nBufLen );
+
+    sal_Int32 nRead = xInput->readBytes( aBuffer, nBufLen );
+    xInput->closeInput();
+
+    if ( nRead == nBufLen )
+        throw io::WrongFormatException();
+
+    sal_Int32 nCurPos = 0;
+    return ParseEntry( aBuffer, nCurPos );
+}
+
+
+
+
+} // namespace svt
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */