/*
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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 legal-notices/CDDLv1_0.txt
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* or http://forgerock.org/license/CDDLv1.0.html.
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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 legal-notices/CDDLv1_0.txt.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* 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 2006-2010 Sun Microsystems, Inc.
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* Portions Copyright 2012-2015 ForgeRock AS
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*/
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package org.opends.server.backends.pluggable;
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import static org.opends.messages.BackendMessages.*;
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import static org.opends.server.backends.pluggable.DnKeyFormat.*;
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import static org.opends.server.util.ServerConstants.*;
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import java.util.AbstractMap.SimpleImmutableEntry;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.List;
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import java.util.Map;
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import java.util.Set;
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import org.forgerock.i18n.slf4j.LocalizedLogger;
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import org.forgerock.opendj.ldap.ByteSequence;
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import org.forgerock.opendj.ldap.ByteSequenceReader;
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import org.forgerock.opendj.ldap.ByteString;
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import org.forgerock.opendj.ldap.ByteStringBuilder;
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import org.forgerock.opendj.ldap.ConditionResult;
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import org.forgerock.opendj.ldap.ResultCode;
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import org.forgerock.opendj.ldap.SearchScope;
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import org.opends.server.backends.pluggable.spi.Cursor;
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import org.opends.server.backends.pluggable.spi.ReadableTransaction;
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import org.opends.server.backends.pluggable.spi.StorageRuntimeException;
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import org.opends.server.backends.pluggable.spi.TreeName;
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import org.opends.server.backends.pluggable.spi.UpdateFunction;
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import org.opends.server.backends.pluggable.spi.WriteableTransaction;
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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.types.Attribute;
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import org.opends.server.types.AttributeType;
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import org.opends.server.types.DN;
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import org.opends.server.types.DirectoryException;
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import org.opends.server.types.Entry;
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import org.opends.server.types.LDAPURL;
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import org.opends.server.types.Modification;
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import org.opends.server.types.SearchResultReference;
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import org.opends.server.util.StaticUtils;
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/**
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* This class represents the referral tree which contains URIs from referral
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* entries.
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* <p>
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* The key is the DN of the referral entry and the value is that of a pair
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* (DN, list of labeled URI in the ref attribute for that entry). The DN must be
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* duplicated in the value because the key is suitable for comparisons but is
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* not reversible to a valid DN. Duplicate keys are permitted since a referral
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* entry can contain multiple values of the ref attribute. Key order is the same
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* as in dn2id so that all referrals in a subtree can be retrieved by cursoring
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* through a range of the records.
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*/
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class DN2URI extends AbstractTree
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{
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private static final LocalizedLogger logger = LocalizedLogger.getLoggerForThisClass();
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private final int prefixRDNComponents;
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/**
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* The standard attribute type that is used to specify the set of referral
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* URLs in a referral entry.
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*/
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private final AttributeType referralType = DirectoryServer.getAttributeTypeOrNull(ATTR_REFERRAL_URL);
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/**
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* A flag that indicates whether there are any referrals contained in this
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* tree. It should only be set to {@code false} when it is known that
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* there are no referrals.
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*/
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private volatile ConditionResult containsReferrals = ConditionResult.UNDEFINED;
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/**
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* Create a new object representing a referral tree in a given
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* entryContainer.
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*
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* @param treeName
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* The name of the referral tree.
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* @param entryContainer
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* The entryContainer of the DN tree.
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* @throws StorageRuntimeException
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* If an error occurs in the storage.
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*/
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DN2URI(TreeName treeName, EntryContainer entryContainer) throws StorageRuntimeException
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{
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super(treeName);
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prefixRDNComponents = entryContainer.getBaseDN().size();
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}
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/** Encodes the value. */
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private ByteSequence encode(DN dn, Collection<String> col)
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{
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if (col != null && !col.isEmpty())
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{
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ByteStringBuilder b = new ByteStringBuilder();
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// encode the dn inside the value
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// because the dn is encoded in a non reversible way in the key
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byte[] dnBytes = StaticUtils.getBytes(dn.toString());
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b.append(dnBytes.length);
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b.append(dnBytes);
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b.append(col.size());
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for (String s : col)
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{
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byte[] bytes = StaticUtils.getBytes(s);
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b.append(bytes.length);
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b.append(bytes);
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}
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return b;
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}
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return null;
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}
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/** Decodes the value as a pair where the first element is the DN key and the second is the actual value. */
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private Map.Entry<DN, List<String>> decode(ByteSequence bs) throws StorageRuntimeException
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{
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return decode0(bs, true);
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}
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private Collection<String> decodeUrisOnly(ByteSequence oldValue)
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{
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return decode0(oldValue, false).getValue();
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}
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private Map.Entry<DN, List<String>> decode0(ByteSequence bs, boolean decodeDN)
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{
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if (!bs.isEmpty())
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{
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ByteSequenceReader r = bs.asReader();
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DN dn = decodeDN(r, decodeDN);
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List<String> uris = decodeUris(r);
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return new SimpleImmutableEntry<>(dn, uris);
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}
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return new SimpleImmutableEntry<>(null, null);
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}
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private DN decodeDN(ByteSequenceReader r, boolean decodeDN)
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{
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final int dnLength = r.getInt();
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if (decodeDN)
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{
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try
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{
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return DN.valueOf(r.getString(dnLength));
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}
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catch (DirectoryException e)
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{
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throw new StorageRuntimeException("Unable to decode DN from binary value", e);
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}
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}
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r.skip(dnLength);
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return null;
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}
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private List<String> decodeUris(ByteSequenceReader r)
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{
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final int nbElems = r.getInt();
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List<String> results = new ArrayList<>(nbElems);
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for (int i = 0; i < nbElems; i++)
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{
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final int stringLength = r.getInt();
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results.add(r.getString(stringLength));
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}
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return results;
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}
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/**
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* Puts a URI value in the referral tree.
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*
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* @param txn a non null transaction
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* @param dn The DN of the referral entry.
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* @param labeledURIs The labeled URI value of the ref attribute.
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* @throws StorageRuntimeException If an error occurs in the storage.
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*/
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private void update(final WriteableTransaction txn, final DN dn, final Collection<String> labeledURIs)
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throws StorageRuntimeException
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{
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final ByteString key = toKey(dn);
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txn.update(getName(), key, new UpdateFunction()
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{
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@Override
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public ByteSequence computeNewValue(ByteSequence oldValue)
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{
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if (oldValue != null)
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{
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final Collection<String> newUris = decodeUrisOnly(oldValue);
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if (newUris.addAll(labeledURIs))
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{
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return encode(dn, newUris);
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}
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return oldValue;
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}
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else
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{
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return encode(dn, labeledURIs);
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}
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}
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});
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containsReferrals = ConditionResult.TRUE;
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}
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/**
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* Delete URI values for a given referral entry from the referral tree.
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*
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* @param txn a non null transaction
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* @param dn The DN of the referral entry for which URI values are to be
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* deleted.
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* @return true if the values were deleted, false if not.
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* @throws StorageRuntimeException If an error occurs in the storage.
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*/
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private boolean delete(WriteableTransaction txn, DN dn) throws StorageRuntimeException
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{
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ByteString key = toKey(dn);
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if (txn.delete(getName(), key))
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{
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containsReferrals = containsReferrals(txn);
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return true;
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}
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return false;
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}
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/**
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* Delete a single URI value from the referral tree.
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* @param txn a non null transaction
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* @param dn The DN of the referral entry.
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* @param labeledURIs The URI value to be deleted.
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* @throws StorageRuntimeException If an error occurs in the storage.
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*/
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private void delete(final WriteableTransaction txn, final DN dn, final Collection<String> labeledURIs)
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throws StorageRuntimeException
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{
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ByteString key = toKey(dn);
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txn.update(getName(), key, new UpdateFunction()
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{
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@Override
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public ByteSequence computeNewValue(ByteSequence oldValue)
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{
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if (oldValue != null)
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{
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final Collection<String> oldUris = decodeUrisOnly(oldValue);
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if (oldUris.removeAll(labeledURIs))
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{
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return encode(dn, oldUris);
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}
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}
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return oldValue;
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}
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});
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containsReferrals = containsReferrals(txn);
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}
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/**
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* Indicates whether the underlying tree contains any referrals.
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*
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* @param txn The transaction to use when making the determination.
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* @return {@code true} if it is believed that the underlying tree may
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* contain at least one referral, or {@code false} if it is certain
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* that it doesn't.
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*/
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private ConditionResult containsReferrals(ReadableTransaction txn)
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{
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try (Cursor<?, ?> cursor = txn.openCursor(getName()))
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{
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return ConditionResult.valueOf(cursor.next());
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}
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catch (Exception e)
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{
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logger.traceException(e);
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return ConditionResult.UNDEFINED;
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}
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}
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/**
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* Update the referral tree for an entry that has been modified. Does
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* not do anything unless the entry before the modification or the entry after
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* the modification is a referral entry.
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*
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* @param txn a non null transaction
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* @param before The entry before the modifications have been applied.
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* @param after The entry after the modifications have been applied.
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* @param mods The sequence of modifications made to the entry.
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* @throws StorageRuntimeException If an error occurs in the storage.
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*/
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void modifyEntry(WriteableTransaction txn, Entry before, Entry after, List<Modification> mods)
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throws StorageRuntimeException
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{
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DN entryDN = before.getName();
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for (Modification mod : mods)
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{
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Attribute modAttr = mod.getAttribute();
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AttributeType modAttrType = modAttr.getAttributeType();
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if (modAttrType.equals(referralType))
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{
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Attribute a = mod.getAttribute();
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switch (mod.getModificationType().asEnum())
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{
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case ADD:
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if (a != null)
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{
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update(txn, entryDN, toStrings(a));
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}
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break;
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case DELETE:
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if (a == null || a.isEmpty())
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{
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delete(txn, entryDN);
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}
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else
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{
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delete(txn, entryDN, toStrings(a));
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}
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break;
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case INCREMENT:
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// Nonsensical.
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break;
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case REPLACE:
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delete(txn, entryDN);
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if (a != null)
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{
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update(txn, entryDN, toStrings(a));
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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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}
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private List<String> toStrings(Attribute a)
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{
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List<String> results = new ArrayList<>(a.size());
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for (ByteString v : a)
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{
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results.add(v.toString());
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}
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return results;
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}
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/**
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* Update the referral tree for an entry that has been replaced. Does not
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* do anything unless the entry before it was replaced or the entry after it
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* was replaced is a referral entry.
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*
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* @param txn
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* A transaction used for the update, or null if none is
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* required.
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* @param before
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* The entry before it was replaced.
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* @param after
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* The entry after it was replaced.
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* @throws StorageRuntimeException
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* If an error occurs in the storage.
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*/
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void replaceEntry(WriteableTransaction txn, Entry before, Entry after)
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throws StorageRuntimeException
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{
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deleteEntry(txn, before);
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addEntry(txn, after);
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}
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/**
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* Update the referral tree for a new entry. Does nothing if the entry
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* is not a referral entry.
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* @param txn a non null transaction
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* @param entry The entry to be added.
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* @throws StorageRuntimeException If an error occurs in the storage.
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*/
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void addEntry(WriteableTransaction txn, Entry entry)
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throws StorageRuntimeException
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{
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Set<String> labeledURIs = entry.getReferralURLs();
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if (labeledURIs != null)
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{
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update(txn, entry.getName(), labeledURIs);
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}
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}
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/**
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* Update the referral tree for a deleted entry. Does nothing if the entry
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* was not a referral entry.
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* @param txn a non null transaction
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* @param entry The entry to be deleted.
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* @throws StorageRuntimeException If an error occurs in the storage.
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*/
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void deleteEntry(WriteableTransaction txn, Entry entry) throws StorageRuntimeException
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{
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Set<String> labeledURIs = entry.getReferralURLs();
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if (labeledURIs != null)
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{
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delete(txn, entry.getName());
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}
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}
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@Override
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public String keyToString(ByteString key)
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{
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return key.toString();
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}
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@Override public String valueToString(ByteString value)
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{
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final Map.Entry<DN, List<String>> dnAndUris = decode(value);
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return dnAndUris.getValue().toString();
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}
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@Override
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public ByteString generateKey(String key)
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{
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try
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{
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return toKey(DN.valueOf(key));
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}
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catch (DirectoryException e)
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{
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return ByteString.empty();
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}
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}
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/**
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* Checks whether the target of an operation is a referral entry and throws
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* a Directory referral exception if it is.
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* @param entry The target entry of the operation, or the base entry of a
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* search operation.
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* @param searchScope The scope of the search operation, or null if the
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* operation is not a search operation.
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* @throws DirectoryException If a referral is found at or above the target
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* DN. The referral URLs will be set appropriately for the references found
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* in the referral entry.
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*/
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void checkTargetForReferral(Entry entry, SearchScope searchScope) throws DirectoryException
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{
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Set<String> referralURLs = entry.getReferralURLs();
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if (referralURLs != null)
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{
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throwReferralException(entry.getName(), entry.getName(), referralURLs, searchScope);
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}
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}
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/**
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* Throws a Directory referral exception for the case where a referral entry
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* exists at or above the target DN of an operation.
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* @param targetDN The target DN of the operation, or the base object of a
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* search operation.
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* @param referralDN The DN of the referral entry.
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* @param labeledURIs The set of labeled URIs in the referral entry.
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* @param searchScope The scope of the search operation, or null if the
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* operation is not a search operation.
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* @throws DirectoryException If a referral is found at or above the target
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* DN. The referral URLs will be set appropriately for the references found
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* in the referral entry.
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*/
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private void throwReferralException(DN targetDN, DN referralDN, Collection<String> labeledURIs,
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SearchScope searchScope) throws DirectoryException
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{
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ArrayList<String> URIList = new ArrayList<>(labeledURIs.size());
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for (String labeledURI : labeledURIs)
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{
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// Remove the label part of the labeled URI if there is a label.
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String uri = labeledURI;
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int i = labeledURI.indexOf(' ');
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if (i != -1)
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{
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uri = labeledURI.substring(0, i);
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}
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try
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{
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LDAPURL ldapurl = LDAPURL.decode(uri, false);
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if ("ldap".equalsIgnoreCase(ldapurl.getScheme()))
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{
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DN urlBaseDN = targetDN;
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if (!referralDN.equals(ldapurl.getBaseDN()))
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{
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urlBaseDN = EntryContainer.modDN(targetDN, referralDN.size(), ldapurl.getBaseDN());
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}
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ldapurl.setBaseDN(urlBaseDN);
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if (searchScope == null)
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{
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// RFC 3296, 5.2. Target Object Considerations:
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// In cases where the URI to be returned is a LDAP URL, the server
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// SHOULD trim any present scope, filter, or attribute list from the
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// URI before returning it. Critical extensions MUST NOT be trimmed
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// or modified.
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StringBuilder builder = new StringBuilder(uri.length());
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ldapurl.toString(builder, true);
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uri = builder.toString();
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}
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else
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{
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// RFC 3296, 5.3. Base Object Considerations:
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// In cases where the URI to be returned is a LDAP URL, the server
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// MUST provide an explicit scope specifier from the LDAP URL prior
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// to returning it.
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ldapurl.getAttributes().clear();
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ldapurl.setScope(searchScope);
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ldapurl.setFilter(null);
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uri = ldapurl.toString();
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}
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}
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}
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catch (DirectoryException e)
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{
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logger.traceException(e);
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// Return the non-LDAP URI as is.
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}
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URIList.add(uri);
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}
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// Throw a directory referral exception containing the URIs.
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throw new DirectoryException(
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ResultCode.REFERRAL, NOTE_REFERRAL_RESULT_MESSAGE.get(referralDN), referralDN, URIList, null);
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}
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/**
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* Process referral entries that are above the target DN of an operation.
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* @param txn a non null transaction
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* @param targetDN The target DN of the operation, or the base object of a
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* search operation.
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* @param searchScope The scope of the search operation, or null if the
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* operation is not a search operation.
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* @throws DirectoryException If a referral is found at or above the target
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* DN. The referral URLs will be set appropriately for the references found
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* in the referral entry.
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*/
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void targetEntryReferrals(ReadableTransaction txn, DN targetDN, SearchScope searchScope) throws DirectoryException
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{
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if (containsReferrals == ConditionResult.UNDEFINED)
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{
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containsReferrals = containsReferrals(txn);
|
}
|
|
if (containsReferrals == ConditionResult.FALSE)
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{
|
return;
|
}
|
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try (Cursor<ByteString, ByteString> cursor = txn.openCursor(getName()))
|
{
|
// Go up through the DIT hierarchy until we find a referral.
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for (DN dn = getParentWithinBase(targetDN); dn != null; dn = getParentWithinBase(dn))
|
{
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// Look for a record whose key matches the current DN.
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if (cursor.positionToKey(toKey(dn)))
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{
|
// Construct a set of all the labeled URIs in the referral.
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Collection<String> labeledURIs = decodeUrisOnly(cursor.getValue());
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throwReferralException(targetDN, dn, labeledURIs, searchScope);
|
}
|
}
|
}
|
catch (StorageRuntimeException e)
|
{
|
logger.traceException(e);
|
}
|
}
|
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private DN getParentWithinBase(DN targetDN)
|
{
|
return targetDN.size() == prefixRDNComponents ? null: targetDN.parent();
|
}
|
|
/**
|
* Return search result references for a search operation using the referral
|
* tree to find all referral entries within scope of the search.
|
* @param txn a non null transaction
|
* @param searchOp The search operation for which search result references
|
* should be returned.
|
* @return <CODE>true</CODE> if the caller should continue processing the
|
* search request and sending additional entries and references, or
|
* <CODE>false</CODE> if not for some reason (e.g., the size limit
|
* has been reached or the search has been abandoned).
|
* @throws DirectoryException If a Directory Server error occurs.
|
*/
|
boolean returnSearchReferences(ReadableTransaction txn, SearchOperation searchOp) throws DirectoryException
|
{
|
if (containsReferrals == ConditionResult.UNDEFINED)
|
{
|
containsReferrals = containsReferrals(txn);
|
}
|
|
if (containsReferrals == ConditionResult.FALSE)
|
{
|
return true;
|
}
|
|
/*
|
* We will iterate forwards through a range of the keys to
|
* find subordinates of the base entry from the top of the tree downwards.
|
*/
|
ByteString baseDN = toKey(searchOp.getBaseDN());
|
ByteStringBuilder suffix = beforeKey(baseDN);
|
ByteStringBuilder end = afterKey(baseDN);
|
|
try (Cursor<ByteString, ByteString> cursor = txn.openCursor(getName()))
|
{
|
// Initialize the cursor very close to the starting value then
|
// step forward until we pass the ending value.
|
boolean success = cursor.positionToKey(suffix);
|
while (success && cursor.getKey().compareTo(end) < 0)
|
{
|
// We have found a subordinate referral.
|
// Make sure the referral is within scope.
|
if (searchOp.getScope() == SearchScope.SINGLE_LEVEL
|
&& DnKeyFormat.findDNKeyParent(cursor.getKey()) != baseDN.length())
|
{
|
continue;
|
}
|
|
// Construct a list of all the URIs in the referral.
|
final Map.Entry<DN, List<String>> dnAndUris = decode(cursor.getValue());
|
final DN dn = dnAndUris.getKey();
|
final Collection<String> labeledURIs = dnAndUris.getValue();
|
SearchResultReference reference = toSearchResultReference(dn, labeledURIs, searchOp.getScope());
|
if (!searchOp.returnReference(dn, reference))
|
{
|
return false;
|
}
|
success = cursor.next();
|
}
|
}
|
catch (StorageRuntimeException e)
|
{
|
logger.traceException(e);
|
}
|
|
return true;
|
}
|
|
private SearchResultReference toSearchResultReference(DN dn, Collection<String> labeledURIs, SearchScope scope)
|
{
|
ArrayList<String> URIList = new ArrayList<>(labeledURIs.size());
|
for (String labeledURI : labeledURIs)
|
{
|
// Remove the label part of the labeled URI if there is a label.
|
String uri = labeledURI;
|
int i = labeledURI.indexOf(' ');
|
if (i != -1)
|
{
|
uri = labeledURI.substring(0, i);
|
}
|
|
// From RFC 3296 section 5.4:
|
// If the URI component is not a LDAP URL, it should be returned as
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// is. If the LDAP URL's DN part is absent or empty, the DN part
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// must be modified to contain the DN of the referral object. If
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// the URI component is a LDAP URL, the URI SHOULD be modified to
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// add an explicit scope specifier.
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try
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{
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LDAPURL ldapurl = LDAPURL.decode(uri, false);
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if ("ldap".equalsIgnoreCase(ldapurl.getScheme()))
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{
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if (ldapurl.getBaseDN().isRootDN())
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{
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ldapurl.setBaseDN(dn);
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}
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ldapurl.getAttributes().clear();
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if (scope == SearchScope.SINGLE_LEVEL)
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{
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ldapurl.setScope(SearchScope.BASE_OBJECT);
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}
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else
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{
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ldapurl.setScope(SearchScope.WHOLE_SUBTREE);
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}
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ldapurl.setFilter(null);
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uri = ldapurl.toString();
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}
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}
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catch (DirectoryException e)
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{
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logger.traceException(e);
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// Return the non-LDAP URI as is.
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}
|
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URIList.add(uri);
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}
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return new SearchResultReference(URIList);
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}
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private ByteString toKey(DN dn)
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{
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return DnKeyFormat.dnToDNKey(dn, prefixRDNComponents);
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}
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}
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