/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE
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* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
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* add the following below this CDDL HEADER, with the fields enclosed
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* by brackets "[]" replaced with your own identifying information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Copyright 2008-2009 Sun Microsystems, Inc.
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*/
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package org.opends.server.extensions;
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import java.util.Collection;
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import java.util.Collections;
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import java.util.LinkedHashSet;
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import java.util.List;
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import java.util.Set;
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import org.opends.server.admin.std.server.EntryDNVirtualAttributeCfg;
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import org.opends.server.api.VirtualAttributeProvider;
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import org.opends.server.config.ConfigException;
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import org.opends.server.core.DirectoryServer;
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import org.opends.server.core.SearchOperation;
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import org.opends.server.loggers.debug.DebugTracer;
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import org.opends.server.types.AttributeType;
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import org.opends.server.types.AttributeValue;
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import org.opends.server.types.ByteString;
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import org.opends.server.types.ByteStringFactory;
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import org.opends.server.types.ConditionResult;
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import org.opends.server.types.DebugLogLevel;
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import org.opends.server.types.DN;
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import org.opends.server.types.Entry;
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import org.opends.server.types.InitializationException;
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import org.opends.server.types.SearchFilter;
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import org.opends.server.types.SearchScope;
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import org.opends.server.types.VirtualAttributeRule;
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import static org.opends.server.loggers.debug.DebugLogger.*;
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import static org.opends.server.util.ServerConstants.*;
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/**
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* This class implements a virtual attribute provider that is meant to serve the
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* entryDN operational attribute as described in draft-zeilenga-ldap-entrydn.
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*/
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public class EntryDNVirtualAttributeProvider
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extends VirtualAttributeProvider<EntryDNVirtualAttributeCfg>
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{
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/**
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* The tracer object for the debug logger.
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*/
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private static final DebugTracer TRACER = getTracer();
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/**
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* Creates a new instance of this entryDN virtual attribute provider.
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*/
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public EntryDNVirtualAttributeProvider()
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{
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super();
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// All initialization should be performed in the
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// initializeVirtualAttributeProvider method.
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}
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/**
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* {@inheritDoc}
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*/
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@Override()
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public void initializeVirtualAttributeProvider(
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EntryDNVirtualAttributeCfg configuration)
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throws ConfigException, InitializationException
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{
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// No initialization is required.
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}
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/**
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* {@inheritDoc}
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*/
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@Override()
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public boolean isMultiValued()
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{
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return false;
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}
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/**
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* {@inheritDoc}
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*/
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@Override()
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public Set<AttributeValue> getValues(Entry entry,
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VirtualAttributeRule rule)
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{
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String normDNString = entry.getDN().toNormalizedString();
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AttributeValue value = new AttributeValue(
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ByteStringFactory.create(normDNString),
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ByteStringFactory.create(normDNString));
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return Collections.singleton(value);
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}
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/**
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* {@inheritDoc}
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*/
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@Override()
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public boolean hasValue(Entry entry, VirtualAttributeRule rule)
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{
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// This virtual attribute provider will always generate a value.
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return true;
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}
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/**
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* {@inheritDoc}
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*/
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@Override()
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public boolean hasValue(Entry entry, VirtualAttributeRule rule,
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AttributeValue value)
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{
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try
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{
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String normalizedDN = entry.getDN().toNormalizedString();
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String normalizedValue = value.getNormalizedStringValue();
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return normalizedDN.equals(normalizedValue);
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}
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catch (Exception e)
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{
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if (debugEnabled())
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{
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TRACER.debugCaught(DebugLogLevel.ERROR, e);
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}
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return false;
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}
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}
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/**
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* {@inheritDoc}
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*/
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@Override()
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public boolean hasAnyValue(Entry entry, VirtualAttributeRule rule,
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Collection<AttributeValue> values)
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{
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String ndnString = entry.getDN().toNormalizedString();
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AttributeValue v = new AttributeValue(ByteStringFactory.create(ndnString),
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ByteStringFactory.create(ndnString));
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return values.contains(v);
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}
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/**
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* {@inheritDoc}
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*/
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@Override()
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public ConditionResult matchesSubstring(Entry entry,
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VirtualAttributeRule rule,
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ByteString subInitial,
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List<ByteString> subAny,
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ByteString subFinal)
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{
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// DNs cannot be used in substring matching.
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return ConditionResult.UNDEFINED;
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}
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/**
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* {@inheritDoc}
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*/
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@Override()
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public ConditionResult greaterThanOrEqualTo(Entry entry,
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VirtualAttributeRule rule,
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AttributeValue value)
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{
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// DNs cannot be used in ordering matching.
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return ConditionResult.UNDEFINED;
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}
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/**
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* {@inheritDoc}
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*/
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@Override()
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public ConditionResult lessThanOrEqualTo(Entry entry,
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VirtualAttributeRule rule,
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AttributeValue value)
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{
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// DNs cannot be used in ordering matching.
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return ConditionResult.UNDEFINED;
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}
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/**
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* {@inheritDoc}
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*/
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@Override()
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public ConditionResult approximatelyEqualTo(Entry entry,
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VirtualAttributeRule rule,
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AttributeValue value)
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{
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// DNs cannot be used in approximate matching.
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return ConditionResult.UNDEFINED;
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}
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/**
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* {@inheritDoc}. This virtual attribute will support search operations only
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* if one of the following is true about the search filter:
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* <UL>
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* <LI>It is an equality filter targeting the associated attribute
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* type.</LI>
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* <LI>It is an AND filter in which at least one of the components is an
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* equality filter targeting the associated attribute type.</LI>
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* <LI>It is an OR filter in which all of the components are equality
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* filters targeting the associated attribute type.</LI>
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* </UL>
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*/
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@Override()
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public boolean isSearchable(VirtualAttributeRule rule,
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SearchOperation searchOperation)
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{
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return isSearchable(rule.getAttributeType(), searchOperation.getFilter(),
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0);
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}
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/**
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* Indicates whether the provided search filter is one that may be used with
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* this virtual attribute provider, optionally operating in a recursive manner
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* to make the determination.
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*
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* @param attributeType The attribute type used to hold the entryDN value.
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* @param searchFilter The search filter for which to make the
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* determination.
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* @param depth The current recursion depth for this processing.
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*
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* @return {@code true} if the provided filter may be used with this virtual
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* attribute provider, or {@code false} if not.
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*/
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private boolean isSearchable(AttributeType attributeType, SearchFilter filter,
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int depth)
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{
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switch (filter.getFilterType())
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{
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case AND:
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if (depth >= MAX_NESTED_FILTER_DEPTH)
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{
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return false;
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}
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for (SearchFilter f : filter.getFilterComponents())
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{
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if (isSearchable(attributeType, f, depth+1))
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{
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return true;
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}
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}
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return false;
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case OR:
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if (depth >= MAX_NESTED_FILTER_DEPTH)
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{
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return false;
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}
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for (SearchFilter f : filter.getFilterComponents())
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{
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if (! isSearchable(attributeType, f, depth+1))
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{
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return false;
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}
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}
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return true;
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case EQUALITY:
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return filter.getAttributeType().equals(attributeType);
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default:
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return false;
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}
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}
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/**
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* {@inheritDoc}
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*/
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@Override()
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public void processSearch(VirtualAttributeRule rule,
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SearchOperation searchOperation)
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{
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SearchFilter filter = searchOperation.getFilter();
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LinkedHashSet<DN> dnSet = new LinkedHashSet<DN>();
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extractDNs(rule.getAttributeType(), filter, dnSet);
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if (dnSet.isEmpty())
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{
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return;
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}
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DN baseDN = searchOperation.getBaseDN();
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SearchScope scope = searchOperation.getScope();
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for (DN dn : dnSet)
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{
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if (! dn.matchesBaseAndScope(baseDN, scope))
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{
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continue;
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}
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try
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{
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Entry entry = DirectoryServer.getEntry(dn);
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if ((entry != null) && filter.matchesEntry(entry))
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{
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searchOperation.returnEntry(entry, null);
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}
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}
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catch (Exception e)
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{
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if (debugEnabled())
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{
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TRACER.debugCaught(DebugLogLevel.ERROR, e);
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}
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}
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}
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}
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/**
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* Extracts the user DNs from the provided filter, operating recursively as
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* necessary, and adds them to the provided set.
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*
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* @param attributeType The attribute type holding the entryDN value.
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* @param filter The search filter to be processed.
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* @param dnSet The set into which the identified DNs should be
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* placed.
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*/
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private void extractDNs(AttributeType attributeType, SearchFilter filter,
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LinkedHashSet<DN> dnSet)
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{
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switch (filter.getFilterType())
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{
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case AND:
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case OR:
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for (SearchFilter f : filter.getFilterComponents())
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{
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extractDNs(attributeType, f, dnSet);
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}
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break;
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case EQUALITY:
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if (filter.getAttributeType().equals(attributeType))
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{
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try
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{
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dnSet.add(DN.decode(filter.getAssertionValue().getValue()));
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}
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catch (Exception e)
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{
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if (debugEnabled())
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{
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TRACER.debugCaught(DebugLogLevel.ERROR, e);
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}
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}
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}
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break;
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}
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}
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}
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