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FileGroupRepository.java
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FileGroupRepository.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 Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.server.security.enterprise.auth;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.SortedSet;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentSkipListSet;
import org.neo4j.kernel.api.security.exception.IllegalCredentialsException;
import org.neo4j.kernel.lifecycle.LifecycleAdapter;
import org.neo4j.logging.Log;
import org.neo4j.logging.LogProvider;
//import org.neo4j.server.security.auth.UserRepository;
import org.neo4j.server.security.auth.exception.ConcurrentModificationException;
import static java.nio.file.StandardCopyOption.ATOMIC_MOVE;
import static java.nio.file.StandardCopyOption.REPLACE_EXISTING;
/**
* Stores group data. In memory, but backed by persistent storage so changes to this repository will survive
* JVM restarts and crashes.
*/
// TODO: Extract shared code with FileUserRepository
public class FileGroupRepository extends LifecycleAdapter implements GroupRepository
{
private final Path groupFile;
/** Quick lookup of groups by name */
private final Map<String,GroupRecord> groupsByName = new ConcurrentHashMap<>();
private final Map<String, SortedSet<String>> groupsByUsername = new ConcurrentHashMap<>();
private final Log log;
/** Master list of groups */
private volatile List<GroupRecord> groups = new ArrayList<>();
private final GroupSerialization serialization = new GroupSerialization();
public FileGroupRepository( Path file, LogProvider logProvider )
{
this.groupFile = file.toAbsolutePath();
this.log = logProvider.getLog( getClass() );
}
@Override
public GroupRecord findByName( String name )
{
return groupsByName.get( name );
}
@Override
public Set<String> findByUsername( String username )
{
return groupsByUsername.get( username );
}
@Override
public void start() throws Throwable
{
if ( Files.exists( groupFile ) )
{
loadGroupsFromFile();
}
}
@Override
public void create( GroupRecord group ) throws IllegalCredentialsException, IOException
{
if ( !isValidName( group.name() ) )
{
throw new IllegalCredentialsException( "'" + group.name() + "' is not a valid group name." );
}
synchronized (this)
{
// Check for existing group
for ( GroupRecord other : groups )
{
if ( other.name().equals( group.name() ) )
{
throw new IllegalCredentialsException( "The specified group already exists" );
}
}
groups.add( group );
saveGroupsToFile();
groupsByName.put( group.name(), group );
populateUserMap( group );
}
}
@Override
public void update( GroupRecord existingGroup, GroupRecord updatedGroup ) throws ConcurrentModificationException, IOException
{
// Assert input is ok
if ( !existingGroup.name().equals( updatedGroup.name() ) )
{
throw new IllegalArgumentException( "updatedGroup has a different name" );
}
synchronized (this)
{
// Copy-on-write for the groups list
List<GroupRecord> newGroups = new ArrayList<>();
boolean foundGroup = false;
for ( GroupRecord other : groups )
{
if ( other.equals( existingGroup ) )
{
foundGroup = true;
newGroups.add( updatedGroup );
} else
{
newGroups.add( other );
}
}
if ( !foundGroup )
{
throw new ConcurrentModificationException();
}
groups = newGroups;
saveGroupsToFile();
groupsByName.put( updatedGroup.name(), updatedGroup );
removeFromUserMap( existingGroup );
populateUserMap( updatedGroup );
}
}
@Override
public boolean delete( GroupRecord group ) throws IOException
{
boolean foundGroup = false;
synchronized (this)
{
// Copy-on-write for the groups list
List<GroupRecord> newGroups = new ArrayList<>();
for ( GroupRecord other : groups )
{
if ( other.name().equals( group.name() ) )
{
foundGroup = true;
} else
{
newGroups.add( other );
}
}
if ( foundGroup )
{
groups = newGroups;
saveGroupsToFile();
groupsByName.remove( group.name() );
}
removeFromUserMap( group );
}
return foundGroup;
}
@Override
public int numberOfGroups()
{
return groups.size();
}
@Override
public boolean isValidName( String name )
{
return name.matches( "^[a-zA-Z0-9_]+$" );
}
private void saveGroupsToFile() throws IOException
{
Path directory = groupFile.getParent();
if ( !Files.exists( directory ) )
{
Files.createDirectories( directory );
}
Path tempFile = Files.createTempFile( directory, groupFile.getFileName().toString() + "-", ".tmp" );
try
{
Files.write( tempFile, serialization.serialize( groups ) );
Files.move( tempFile, groupFile, ATOMIC_MOVE, REPLACE_EXISTING );
} catch ( Throwable e )
{
Files.delete( tempFile );
throw e;
}
}
private void loadGroupsFromFile() throws IOException
{
byte[] fileBytes = Files.readAllBytes( groupFile );
List<GroupRecord> loadedGroups;
try
{
loadedGroups = serialization.deserializeGroups( fileBytes );
} catch ( GroupSerialization.FormatException e )
{
log.error( "Ignoring group file \"%s\" (%s)", groupFile.toAbsolutePath(), e.getMessage() );
throw new IllegalStateException( "Failed to read group file: " + groupFile );
}
groups = loadedGroups;
for ( GroupRecord group : groups )
{
groupsByName.put( group.name(), group );
populateUserMap( group );
}
}
private void populateUserMap( GroupRecord group )
{
for ( String username : group.users() )
{
SortedSet<String> memberOfGroups = groupsByUsername.get( username );
if ( memberOfGroups == null )
{
memberOfGroups = new ConcurrentSkipListSet<>();
groupsByUsername.put( username, memberOfGroups );
}
memberOfGroups.add( group.name() );
}
}
private void removeFromUserMap( GroupRecord group )
{
for ( String username : group.users() )
{
SortedSet<String> memberOfGroups = groupsByUsername.get( username );
if ( memberOfGroups != null )
{
memberOfGroups.remove( group.name() );
}
}
}
}