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FileUserRepository.java
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FileUserRepository.java
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/*
* Copyright (c) 2002-2016 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.server.security.auth;
import java.io.File;
import java.io.IOException;
import java.util.List;
import java.util.stream.Collectors;
import org.neo4j.io.fs.FileSystemAbstraction;
import org.neo4j.logging.Log;
import org.neo4j.logging.LogProvider;
import org.neo4j.server.security.auth.exception.FormatException;
/**
* Stores user auth data. In memory, but backed by persistent storage so changes to this repository will survive
* JVM restarts and crashes.
*/
public class FileUserRepository extends AbstractUserRepository
{
private final File authFile;
private final FileSystemAbstraction fileSystem;
// TODO: We could improve concurrency by using a ReadWriteLock
private final Log log;
private final UserSerialization serialization = new UserSerialization();
public FileUserRepository( FileSystemAbstraction fileSystem, File file, LogProvider logProvider )
{
this.fileSystem = fileSystem;
this.authFile = file;
this.log = logProvider.getLog( getClass() );
}
@Override
public void start() throws Throwable
{
clear();
ListSnapshot<User> onDiskUsers = readPersistedUsers();
if ( onDiskUsers != null )
{
setUsers( onDiskUsers );
}
}
@Override
protected ListSnapshot<User> readPersistedUsers() throws IOException
{
if ( fileSystem.fileExists( authFile ) )
{
long readTime;
List<User> readUsers;
try
{
readTime = fileSystem.lastModifiedTime( authFile );
readUsers = serialization.loadRecordsFromFile( fileSystem, authFile );
}
catch ( FormatException e )
{
log.error( "Failed to read authentication file \"%s\" (%s)",
authFile.getAbsolutePath(), e.getMessage() );
throw new IllegalStateException( "Failed to read authentication file: " + authFile );
}
return new ListSnapshot<>( readTime, readUsers );
}
return null;
}
@Override
protected void persistUsers() throws IOException
{
serialization.saveRecordsToFile( fileSystem, authFile, users );
}
@Override
public ListSnapshot<User> getPersistedSnapshot() throws IOException
{
if ( lastLoaded.get() < fileSystem.lastModifiedTime( authFile ) )
{
return readPersistedUsers();
}
synchronized ( this )
{
return new ListSnapshot<>( lastLoaded.get(), users.stream().collect( Collectors.toList() ) );
}
}
}