org.wildfly.security.sasl.util.ServiceLoaderSaslServerFactory 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.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.SaslServer;
import javax.security.sasl.SaslServerFactory;
import javax.security.sasl.SaslException;
/**
* A {@link SaslServerFactory} which uses a {@link ServiceLoader} to find implementations.
*
* @author David M. Lloyd
*/
public final class ServiceLoaderSaslServerFactory implements SaslServerFactory {
private final ServiceLoader loader;
/**
* Construct a new instance.
*
* @param loader the service loader to use
*/
public ServiceLoaderSaslServerFactory(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 ServiceLoaderSaslServerFactory(final ClassLoader classLoader) {
this(ServiceLoader.load(SaslServerFactory.class, classLoader));
}
public SaslServer createSaslServer(final String mechanism, final String protocol, final String serverName, final Map props, final CallbackHandler cbh) throws SaslException {
synchronized (loader) {
final Iterator iterator = loader.iterator();
SaslServerFactory serverFactory;
SaslServer saslServer;
for (;;) try {
// Service loader iterators can blow up in various ways; that's why the loop is structured this way
if (! iterator.hasNext()) {
break;
}
serverFactory = iterator.next();
// let SaslException bubble up
saslServer = serverFactory.createSaslServer(mechanism, protocol, serverName, props, cbh);
if (saslServer != null) {
return saslServer;
}
} catch (ServiceConfigurationError ignored) {}
return null;
}
}
public String[] getMechanismNames(final Map props) {
synchronized (loader){
final Set set = new LinkedHashSet<>();
final Iterator iterator = loader.iterator();
SaslServerFactory serverFactory;
for (; ; )
try {
// Service loader iterators can blow up in various ways; that's why the loop is structured this way
if (!iterator.hasNext()) {
break;
}
serverFactory = iterator.next();
// let SaslException bubble up
Collections.addAll(set, serverFactory.getMechanismNames(props));
} catch (ServiceConfigurationError ignored) {
}
return set.toArray(new String[set.size()]);
}
}
}