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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 2015 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 static org.wildfly.common.Assert.checkNotNullParam;

import java.io.IOException;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.function.Supplier;

import javax.security.auth.callback.Callback;
import javax.security.auth.callback.CallbackHandler;
import javax.security.auth.callback.UnsupportedCallbackException;

import org.wildfly.security.auth.callback.SSLCallback;
import org.wildfly.security.ssl.SSLConnection;

/**
 * A callback handler which delegates to another callback handler, passing the authentication's SSL/TLS information to that
 * callback handler on its first invocation.
 *
 * @author David M. Lloyd
 */
public final class SSLQueryCallbackHandler implements CallbackHandler {
    private final CallbackHandler delegate;
    private final Supplier sslConnectionSupplier;

    private final AtomicBoolean once = new AtomicBoolean(true);

    /**
     * Construct a new instance.
     *
     * @param delegate the delegate callback handler
     * @param sslConnectionSupplier supplier for the current SSL connection
     */
    public SSLQueryCallbackHandler(final CallbackHandler delegate, final Supplier sslConnectionSupplier) {
        this.delegate = delegate;
        this.sslConnectionSupplier = checkNotNullParam("sslConnectionSupplier", sslConnectionSupplier);
    }

    public void handle(final Callback[] callbacks) throws IOException, UnsupportedCallbackException {
        SSLConnection sslConnection;
        if (! once.compareAndSet(true, false) || (sslConnection = sslConnectionSupplier.get()) == null) {
            delegate.handle(callbacks);
            return;
        }
        final int length = callbacks.length;
        final Callback[] newCallbacks = new Callback[length + 1];
        newCallbacks[0] = new SSLCallback(sslConnection);
        System.arraycopy(callbacks, 0, newCallbacks, 1, length);
        try {
            delegate.handle(newCallbacks);
        } catch (UnsupportedCallbackException e) {
            if (e.getCallback() instanceof SSLCallback) {
                delegate.handle(callbacks);
                return;
            }
            throw e;
        }
    }

    void activate () {
        once.set(false);
    }

}