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AbstractRoleRepository.java
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AbstractRoleRepository.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.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.lifecycle.LifecycleAdapter;
import org.neo4j.server.security.auth.exception.ConcurrentModificationException;
public abstract class AbstractRoleRepository extends LifecycleAdapter implements RoleRepository
{
// TODO: We could improve concurrency by using a ReadWriteLock
/** Quick lookup of roles by name */
protected final Map<String,RoleRecord> rolesByName = new ConcurrentHashMap<>();
private final Map<String, SortedSet<String>> rolesByUsername = new ConcurrentHashMap<>();
/** Master list of roles */
protected volatile List<RoleRecord> roles = new ArrayList<>();
@Override
public RoleRecord findByName( String name )
{
return rolesByName.get( name );
}
@Override
public Set<String> findByUsername( String username )
{
return rolesByUsername.get( username );
}
@Override
public void create( RoleRecord role ) throws IllegalArgumentException, IOException
{
if ( !isValidName( role.name() ) )
{
throw new IllegalArgumentException( "'" + role.name() + "' is not a valid role name." );
}
synchronized (this)
{
// Check for existing role
for ( RoleRecord other : roles )
{
if ( other.name().equals( role.name() ) )
{
throw new IllegalArgumentException( "The specified role already exists" );
}
}
roles.add( role );
saveRoles();
rolesByName.put( role.name(), role );
populateUserMap( role );
}
}
@Override
public void update( RoleRecord existingRole, RoleRecord updatedRole ) throws ConcurrentModificationException, IOException
{
// Assert input is ok
if ( !existingRole.name().equals( updatedRole.name() ) )
{
throw new IllegalArgumentException( "updated role has a different name" );
}
synchronized (this)
{
// Copy-on-write for the roles list
List<RoleRecord> newRoles = new ArrayList<>();
boolean foundRole = false;
for ( RoleRecord other : roles )
{
if ( other.equals( existingRole ) )
{
foundRole = true;
newRoles.add( updatedRole );
} else
{
newRoles.add( other );
}
}
if ( !foundRole )
{
throw new ConcurrentModificationException();
}
roles = newRoles;
saveRoles();
rolesByName.put( updatedRole.name(), updatedRole );
removeFromUserMap( existingRole );
populateUserMap( updatedRole );
}
}
@Override
public boolean delete( RoleRecord role ) throws IOException
{
boolean foundRole = false;
synchronized (this)
{
// Copy-on-write for the roles list
List<RoleRecord> newRoles = new ArrayList<>();
for ( RoleRecord other : roles )
{
if ( other.name().equals( role.name() ) )
{
foundRole = true;
} else
{
newRoles.add( other );
}
}
if ( foundRole )
{
roles = newRoles;
saveRoles();
rolesByName.remove( role.name() );
}
removeFromUserMap( role );
}
return foundRole;
}
/**
* Override this in the implementing class to persist roles
* @throws IOException
*/
abstract protected void saveRoles() throws IOException;
@Override
public int numberOfRoles()
{
return roles.size();
}
@Override
public void removeUserFromAllRoles( String username ) throws ConcurrentModificationException, IOException
{
synchronized ( this )
{
Set<String> roles = rolesByUsername.get( username );
if ( roles != null )
{
// Since update() is modifying the set we create a copy for the iteration
List<String> rolesToRemoveFrom = new ArrayList<>( roles );
for ( String roleName : rolesToRemoveFrom )
{
RoleRecord role = rolesByName.get( roleName );
RoleRecord newRole = role.augment().withoutUser( username ).build();
update( role, newRole );
}
}
}
}
protected void populateUserMap( RoleRecord role )
{
for ( String username : role.users() )
{
SortedSet<String> memberOfRoles = rolesByUsername.get( username );
if ( memberOfRoles == null )
{
memberOfRoles = new ConcurrentSkipListSet<>();
rolesByUsername.put( username, memberOfRoles );
}
memberOfRoles.add( role.name() );
}
}
protected void removeFromUserMap( RoleRecord role )
{
for ( String username : role.users() )
{
SortedSet<String> memberOfRoles = rolesByUsername.get( username );
if ( memberOfRoles != null )
{
memberOfRoles.remove( role.name() );
}
}
}
}