/*
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* The contents of this file are subject to the terms of the Common Development and
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* Distribution License (the License). You may not use this file except in compliance with the
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* License.
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*
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* You can obtain a copy of the License at legal/CDDLv1.0.txt. See the License for the
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* specific language governing permission and limitations under the License.
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*
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* When distributing Covered Software, include this CDDL Header Notice in each file and include
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* the License file at legal/CDDLv1.0.txt. If applicable, add the following below the CDDL
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* Header, with the fields enclosed by brackets [] replaced by your own identifying
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* information: "Portions Copyright [year] [name of copyright owner]".
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*
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* Copyright 2012-2014 ForgeRock AS.
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*/
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package org.forgerock.opendj.rest2ldap;
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import java.util.ArrayList;
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import java.util.LinkedHashSet;
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import java.util.LinkedList;
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import java.util.List;
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import java.util.Set;
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import java.util.concurrent.atomic.AtomicInteger;
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import java.util.concurrent.atomic.AtomicReference;
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import org.forgerock.json.fluent.JsonPointer;
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import org.forgerock.json.fluent.JsonValue;
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import org.forgerock.json.resource.BadRequestException;
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import org.forgerock.json.resource.ResourceException;
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import org.forgerock.json.resource.ResultHandler;
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import org.forgerock.opendj.ldap.Attribute;
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import org.forgerock.opendj.ldap.AttributeDescription;
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import org.forgerock.opendj.ldap.ByteString;
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import org.forgerock.opendj.ldap.DN;
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import org.forgerock.opendj.ldap.Entry;
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import org.forgerock.opendj.ldap.EntryNotFoundException;
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import org.forgerock.opendj.ldap.LdapException;
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import org.forgerock.opendj.ldap.Filter;
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import org.forgerock.opendj.ldap.LinkedAttribute;
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import org.forgerock.opendj.ldap.MultipleEntriesFoundException;
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import org.forgerock.opendj.ldap.ResultCode;
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import org.forgerock.opendj.ldap.SearchResultHandler;
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import org.forgerock.opendj.ldap.SearchScope;
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import org.forgerock.opendj.ldap.requests.SearchRequest;
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import org.forgerock.opendj.ldap.responses.Result;
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import org.forgerock.opendj.ldap.responses.SearchResultEntry;
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import org.forgerock.opendj.ldap.responses.SearchResultReference;
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import org.forgerock.util.promise.Function;
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import org.forgerock.util.promise.NeverThrowsException;
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import org.forgerock.util.promise.FailureHandler;
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import org.forgerock.util.promise.SuccessHandler;
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import static org.forgerock.opendj.ldap.LdapException.*;
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import static org.forgerock.opendj.ldap.requests.Requests.*;
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import static org.forgerock.opendj.rest2ldap.Rest2LDAP.*;
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import static org.forgerock.opendj.rest2ldap.Utils.*;
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/**
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* An attribute mapper which provides a mapping from a JSON value to a single DN
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* valued LDAP attribute.
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*/
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public final class ReferenceAttributeMapper extends AbstractLDAPAttributeMapper<ReferenceAttributeMapper> {
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/**
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* The maximum number of candidate references to allow in search filters.
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*/
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private static final int SEARCH_MAX_CANDIDATES = 1000;
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private final DN baseDN;
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private Filter filter;
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private final AttributeMapper mapper;
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private final AttributeDescription primaryKey;
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private SearchScope scope = SearchScope.WHOLE_SUBTREE;
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ReferenceAttributeMapper(final AttributeDescription ldapAttributeName, final DN baseDN,
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final AttributeDescription primaryKey, final AttributeMapper mapper) {
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super(ldapAttributeName);
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this.baseDN = baseDN;
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this.primaryKey = primaryKey;
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this.mapper = mapper;
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}
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/**
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* Sets the filter which should be used when searching for referenced LDAP
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* entries. The default is {@code (objectClass=*)}.
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*
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* @param filter
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* The filter which should be used when searching for referenced
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* LDAP entries.
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* @return This attribute mapper.
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*/
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public ReferenceAttributeMapper searchFilter(final Filter filter) {
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this.filter = ensureNotNull(filter);
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return this;
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}
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/**
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* Sets the filter which should be used when searching for referenced LDAP
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* entries. The default is {@code (objectClass=*)}.
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*
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* @param filter
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* The filter which should be used when searching for referenced
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* LDAP entries.
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* @return This attribute mapper.
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*/
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public ReferenceAttributeMapper searchFilter(final String filter) {
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return searchFilter(Filter.valueOf(filter));
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}
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/**
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* Sets the search scope which should be used when searching for referenced
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* LDAP entries. The default is {@link SearchScope#WHOLE_SUBTREE}.
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*
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* @param scope
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* The search scope which should be used when searching for
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* referenced LDAP entries.
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* @return This attribute mapper.
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*/
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public ReferenceAttributeMapper searchScope(final SearchScope scope) {
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this.scope = ensureNotNull(scope);
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return this;
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}
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@Override
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public String toString() {
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return "reference(" + ldapAttributeName + ")";
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}
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@Override
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void getLDAPFilter(final Context c, final JsonPointer path, final JsonPointer subPath, final FilterType type,
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final String operator, final Object valueAssertion, final ResultHandler<Filter> h) {
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// Construct a filter which can be used to find referenced resources.
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mapper.getLDAPFilter(c, path, subPath, type, operator, valueAssertion, new ResultHandler<Filter>() {
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@Override
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public void handleError(final ResourceException error) {
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h.handleError(error); // Propagate.
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}
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@Override
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public void handleResult(final Filter result) {
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// Search for all referenced entries and construct a filter.
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final SearchRequest request = createSearchRequest(result);
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final List<Filter> subFilters = new LinkedList<Filter>();
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final FailureHandler<LdapException> failureHandler = new FailureHandler<LdapException>() {
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@Override
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public void handleError(LdapException error) {
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h.handleError(asResourceException(error)); // Propagate.
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}
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};
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c.getConnection().searchAsync(request, new SearchResultHandler() {
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@Override
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public boolean handleEntry(final SearchResultEntry entry) {
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if (subFilters.size() < SEARCH_MAX_CANDIDATES) {
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subFilters.add(Filter.equality(ldapAttributeName.toString(), entry.getName()));
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return true;
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} else {
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// No point in continuing - maximum candidates reached.
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return false;
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}
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}
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@Override
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public boolean handleReference(final SearchResultReference reference) {
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// Ignore references.
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return true;
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}
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}).onSuccess(new SuccessHandler<Result>() {
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@Override
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public void handleResult(Result result) {
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if (subFilters.size() >= SEARCH_MAX_CANDIDATES) {
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failureHandler.handleError(newLdapException(ResultCode.ADMIN_LIMIT_EXCEEDED));
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} else if (subFilters.size() == 1) {
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h.handleResult(subFilters.get(0));
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} else {
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h.handleResult(Filter.or(subFilters));
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}
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}
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}).onFailure(failureHandler);
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}
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});
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}
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@Override
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void getNewLDAPAttributes(final Context c, final JsonPointer path, final List<Object> newValues,
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final ResultHandler<Attribute> h) {
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/*
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* For each value use the subordinate mapper to obtain the LDAP primary
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* key, the perform a search for each one to find the corresponding
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* entries.
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*/
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final Attribute newLDAPAttribute = new LinkedAttribute(ldapAttributeName);
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final AtomicInteger pendingSearches = new AtomicInteger(newValues.size());
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final AtomicReference<ResourceException> exception = new AtomicReference<ResourceException>();
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for (final Object value : newValues) {
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mapper.create(c, path, new JsonValue(value), new ResultHandler<List<Attribute>>() {
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@Override
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public void handleError(final ResourceException error) {
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h.handleError(error);
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}
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@Override
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public void handleResult(final List<Attribute> result) {
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Attribute primaryKeyAttribute = null;
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for (final Attribute attribute : result) {
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if (attribute.getAttributeDescription().equals(primaryKey)) {
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primaryKeyAttribute = attribute;
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break;
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}
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}
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if (primaryKeyAttribute == null || primaryKeyAttribute.isEmpty()) {
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h.handleError(new BadRequestException(i18n(
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"The request cannot be processed because the reference "
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+ "field '%s' contains a value which does not contain " + "a primary key", path)));
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return;
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}
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if (primaryKeyAttribute.size() > 1) {
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h.handleError(new BadRequestException(i18n(
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"The request cannot be processed because the reference "
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+ "field '%s' contains a value which contains multiple " + "primary keys", path)));
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return;
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}
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// Now search for the referenced entry in to get its DN.
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final ByteString primaryKeyValue = primaryKeyAttribute.firstValue();
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final Filter filter = Filter.equality(primaryKey.toString(), primaryKeyValue);
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final SearchRequest search = createSearchRequest(filter);
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c.getConnection().searchSingleEntryAsync(search).onSuccess(new SuccessHandler<SearchResultEntry>() {
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@Override
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public void handleResult(final SearchResultEntry result) {
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synchronized (newLDAPAttribute) {
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newLDAPAttribute.add(result.getName());
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}
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completeIfNecessary();
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}
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}).onFailure(new FailureHandler<LdapException>() {
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@Override
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public void handleError(final LdapException error) {
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ResourceException re;
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try {
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throw error;
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} catch (final EntryNotFoundException e) {
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re =
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new BadRequestException(i18n("The request cannot be processed "
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+ "because the resource '%s' " + "referenced in field '%s' does "
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+ "not exist", primaryKeyValue.toString(), path));
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} catch (final MultipleEntriesFoundException e) {
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re =
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new BadRequestException(i18n(
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"The request cannot be processed " + "because the resource '%s' "
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+ "referenced in field '%s' is " + "ambiguous",
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primaryKeyValue.toString(), path));
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} catch (final LdapException e) {
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re = asResourceException(e);
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}
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exception.compareAndSet(null, re);
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completeIfNecessary();
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}
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});
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}
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private void completeIfNecessary() {
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if (pendingSearches.decrementAndGet() == 0) {
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if (exception.get() != null) {
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h.handleError(exception.get());
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} else {
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h.handleResult(newLDAPAttribute);
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}
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}
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}
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});
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}
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}
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@Override
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ReferenceAttributeMapper getThis() {
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return this;
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}
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@Override
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void read(final Context c, final JsonPointer path, final Entry e, final ResultHandler<JsonValue> h) {
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final Attribute attribute = e.getAttribute(ldapAttributeName);
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if (attribute == null || attribute.isEmpty()) {
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h.handleResult(null);
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} else if (attributeIsSingleValued()) {
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try {
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final DN dn = attribute.parse().usingSchema(c.getConfig().schema()).asDN();
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readEntry(c, path, dn, h);
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} catch (final Exception ex) {
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// The LDAP attribute could not be decoded.
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h.handleError(asResourceException(ex));
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}
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} else {
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try {
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final Set<DN> dns = attribute.parse().usingSchema(c.getConfig().schema()).asSetOfDN();
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final ResultHandler<JsonValue> handler =
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accumulate(dns.size(), transform(new Function<List<JsonValue>, JsonValue, NeverThrowsException>() {
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@Override
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public JsonValue apply(final List<JsonValue> value) {
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if (value.isEmpty()) {
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/*
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* No values, so omit the entire JSON object
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* from the resource.
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*/
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return null;
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} else {
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// Combine values into a single JSON array.
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final List<Object> result = new ArrayList<Object>(value.size());
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for (final JsonValue e : value) {
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result.add(e.getObject());
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}
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return new JsonValue(result);
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}
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}
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}, h));
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for (final DN dn : dns) {
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readEntry(c, path, dn, handler);
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}
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} catch (final Exception ex) {
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// The LDAP attribute could not be decoded.
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h.handleError(asResourceException(ex));
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}
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}
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}
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private SearchRequest createSearchRequest(final Filter result) {
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final Filter searchFilter = filter != null ? Filter.and(filter, result) : result;
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return newSearchRequest(baseDN, scope, searchFilter, "1.1");
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}
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private void readEntry(final Context c, final JsonPointer path, final DN dn,
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final ResultHandler<JsonValue> handler) {
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final Set<String> requestedLDAPAttributes = new LinkedHashSet<String>();
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mapper.getLDAPAttributes(c, path, new JsonPointer(), requestedLDAPAttributes);
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c.getConnection().readEntryAsync(dn, requestedLDAPAttributes)
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.onSuccess(new SuccessHandler<SearchResultEntry>() {
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@Override
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public void handleResult(final SearchResultEntry result) {
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mapper.read(c, path, result, handler);
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}
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}).onFailure(new FailureHandler<LdapException>() {
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@Override
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public void handleError(final LdapException error) {
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if (!(error instanceof EntryNotFoundException)) {
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handler.handleError(asResourceException(error));
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} else {
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/*
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* The referenced entry does not exist so ignore it
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* since it cannot be mapped.
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*/
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handler.handleResult(null);
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}
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}
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});
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}
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}
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