org.wildfly.security.sasl.util.ServiceLoaderSaslClientFactory Maven / Gradle / Ivy
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* 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.Collections;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.ServiceConfigurationError;
import java.util.ServiceLoader;
import java.util.Set;
import javax.security.auth.callback.CallbackHandler;
import javax.security.sasl.SaslClient;
import javax.security.sasl.SaslClientFactory;
import javax.security.sasl.SaslException;
/**
* A {@link SaslClientFactory} which uses a {@link ServiceLoader} to find implementations.
*
* @author David M. Lloyd
*/
public final class ServiceLoaderSaslClientFactory implements SaslClientFactory {
private final ServiceLoader loader;
/**
* Construct a new instance.
*
* @param loader the service loader to use
*/
public ServiceLoaderSaslClientFactory(final ServiceLoader loader) {
this.loader = loader;
}
/**
* Construct a new instance.
*
* @param classLoader the class loader to use as the basis of the provider search, or {@code null} to use the system
* or bootstrap class loader
*/
public ServiceLoaderSaslClientFactory(final ClassLoader classLoader) {
this(ServiceLoader.load(SaslClientFactory.class, classLoader));
}
public SaslClient createSaslClient(final String[] mechanisms, final String authorizationId, final String protocol, final String serverName, final Map props, final CallbackHandler cbh) throws SaslException {
final ArrayList factoryList = new ArrayList<>();
synchronized (loader) {
final Iterator iterator = loader.iterator();
for (;;) try {
// Service loader iterators can blow up in various ways; that's why the loop is structured this way
if (! iterator.hasNext()) {
break;
}
factoryList.add(iterator.next());
} catch (ServiceConfigurationError ignored) {}
}
SaslClient saslClient;
final String[] mechArray = new String[1];
for (String mechanism : mechanisms) {
mechArray[0] = mechanism;
for (SaslClientFactory clientFactory : factoryList) {
// let SaslException bubble up
saslClient = clientFactory.createSaslClient(mechArray, authorizationId, protocol, serverName, props, cbh);
if (saslClient != null) {
return saslClient;
}
}
}
// no mechs found
return null;
}
public String[] getMechanismNames(final Map props) {
synchronized (loader) {
final Set set = new LinkedHashSet<>();
final Iterator iterator = loader.iterator();
SaslClientFactory clientFactory;
for (;;) try {
// Service loader iterators can blow up in various ways; that's why the loop is structured this way
if (! iterator.hasNext()) {
break;
}
clientFactory = iterator.next();
// let SaslException bubble up
Collections.addAll(set, clientFactory.getMechanismNames(props));
} catch (ServiceConfigurationError ignored) {}
return set.toArray(new String[set.size()]);
}
}
}