org.wildfly.security.sasl.util.ServiceLoaderSaslClientFactory Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
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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()]);
}
}
}