/*
* JBoss, Home of Professional Open Source.
* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.wildfly.security.sasl.util;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Map;
import java.util.function.Predicate;
import javax.security.auth.callback.CallbackHandler;
import javax.security.sasl.SaslClient;
import javax.security.sasl.SaslClientFactory;
import javax.security.sasl.SaslException;
import org.wildfly.common.Assert;
import org.wildfly.common.math.HashMath;
/**
* A {@link SaslClientFactory} which filters available mechanisms (either inclusively or exclusively) from a delegate
* {@code SaslClientFactory}.
*
* @author <a href="mailto:david.lloyd@redhat.com">David M. Lloyd</a>
*/
public final class FilterMechanismSaslClientFactory extends AbstractDelegatingSaslClientFactory {
private final Predicate<String> predicate;
/**
* Construct a new instance.
*
* @param delegate the factory to delegate to
* @param predicate the mechanism name predicate
*/
public FilterMechanismSaslClientFactory(final SaslClientFactory delegate, final Predicate<String> predicate) {
super(delegate);
Assert.checkNotNullParam("predicate", predicate);
this.predicate = predicate;
}
/**
* Construct a new instance.
*
* @param delegate the factory to delegate to
* @param include {@code true} to only include the given mechanisms, {@code false} to exclude them
* @param mechanisms the mechanisms to include or exclude
*/
public FilterMechanismSaslClientFactory(final SaslClientFactory delegate, boolean include, String... mechanisms) {
super(delegate);
Assert.checkNotNullParam("mechanisms", mechanisms);
final HashSet<String> set = new HashSet<String>(mechanisms.length);
Collections.addAll(set, mechanisms);
Predicate<String> predicate = set::contains;
this.predicate = include ? predicate : predicate.negate();
}
/**
* Construct a new instance.
*
* @param delegate the factory to delegate to
* @param include {@code true} to only include the given mechanisms, {@code false} to exclude them
* @param mechanisms the mechanisms to include or exclude
*/
public FilterMechanismSaslClientFactory(final SaslClientFactory delegate, boolean include, Collection<String> mechanisms) {
super(delegate);
Assert.checkNotNullParam("mechanisms", mechanisms);
final HashSet<String> set = new HashSet<String>(mechanisms);
Predicate<String> predicate = set::contains;
this.predicate = include ? predicate : predicate.negate();
}
public SaslClient createSaslClient(final String[] mechanisms, final String authorizationId, final String protocol, final String serverName, final Map<String, ?> props, final CallbackHandler cbh) throws SaslException {
for (String mechanism : mechanisms) {
if (! predicate.test(mechanism)) {
// make a copy and remove the unsupported mechanisms
final ArrayList<String> list = new ArrayList<>(mechanisms.length - 1);
for (String m2 : mechanisms) {
if (predicate.test(m2)) {
list.add(m2);
}
}
if (list.size() == 0) { return null; }
return delegate.createSaslClient(list.toArray(new String[list.size()]), authorizationId, protocol, serverName, props, cbh);
}
}
return delegate.createSaslClient(mechanisms, authorizationId, protocol, serverName, props, cbh);
}
public String[] getMechanismNames(final Map<String, ?> props) {
final String[] names = delegate.getMechanismNames(props);
final ArrayList<String> list = new ArrayList<>(names.length);
for (String name : names) {
if (predicate.test(name)) {
list.add(name);
}
}
return list.toArray(new String[list.size()]);
}
@SuppressWarnings("checkstyle:equalshashcode")
public boolean equals(final Object other) {
return other instanceof FilterMechanismSaslClientFactory && equals((FilterMechanismSaslClientFactory) other);
}
@SuppressWarnings("checkstyle:equalshashcode")
public boolean equals(final AbstractDelegatingSaslClientFactory other) {
return other instanceof FilterMechanismSaslClientFactory && equals((FilterMechanismSaslClientFactory) other);
}
@SuppressWarnings("checkstyle:equalshashcode")
public boolean equals(final FilterMechanismSaslClientFactory other) {
return super.equals(other) && predicate.equals(other.predicate);
}
protected int calculateHashCode() {
return HashMath.multiHashOrdered(HashMath.multiHashOrdered(super.calculateHashCode(), getClass().hashCode()), predicate.hashCode());
}
}