io.undertow.protocols.alpn.JettyAlpnProvider 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 io.undertow.protocols.alpn;

import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Arrays;
import java.util.List;
import javax.net.ssl.SSLEngine;
import javax.net.ssl.SSLSession;

import org.eclipse.jetty.alpn.ALPN;

/**
 * Jetty ALPN implementation. This is the lowest priority
 *
 * @author Stuart Douglas
 */
public class JettyAlpnProvider implements ALPNProvider {

    private static final String PROTOCOL_KEY = JettyAlpnProvider.class.getName() + ".protocol";

    private static final boolean ENABLED;

    static {
        ENABLED = AccessController.doPrivileged(new PrivilegedAction() {
            @Override
            public Boolean run() {
                try {
                    Class.forName("org.eclipse.jetty.alpn.ALPN", true, JettyAlpnProvider.class.getClassLoader());
                    return true;
                } catch (ClassNotFoundException e) {
                    return false;
                }
            }
        });
    }

    @Override
    public boolean isEnabled(SSLEngine sslEngine) {
        return ENABLED;
    }

    @Override
    public SSLEngine setProtocols(SSLEngine engine, String[] protocols) {
        return Impl.setProtocols(engine, protocols);
    }

    @Override
    public String getSelectedProtocol(SSLEngine engine) {
        SSLSession handshake = engine.getHandshakeSession();
        if (handshake != null) {
            return (String) handshake.getValue(PROTOCOL_KEY);
        }
        handshake = engine.getSession();
        if (handshake != null) {
            return (String) handshake.getValue(PROTOCOL_KEY);
        }
        return null;
    }

    @Override
    public int getPriority() {
        return 100;
    }

    private static class Impl {

        static SSLEngine setProtocols(final SSLEngine engine, final String[] protocols) {
            if (engine.getUseClientMode()) {
                ALPN.put(engine, new ALPNClientSelectionProvider(Arrays.asList(protocols), engine));
            } else {
                ALPN.put(engine, new ALPN.ServerProvider() {
                    @Override
                    public void unsupported() {
                        ALPN.remove(engine);
                    }

                    @Override
                    public String select(List strings) {
                        ALPN.remove(engine);
                        for (String p : protocols) {
                            if (strings.contains(p)) {
                                engine.getHandshakeSession().putValue(PROTOCOL_KEY, p);
                                return p;
                            }
                        }
                        return null;
                    }
                });
            }
            return engine;
        }
    }


    private static class ALPNClientSelectionProvider implements ALPN.ClientProvider {
        final List protocols;
        private String selected;
        private final SSLEngine sslEngine;

        private ALPNClientSelectionProvider(List protocols, SSLEngine sslEngine) {
            this.protocols = protocols;
            this.sslEngine = sslEngine;
        }

        public boolean supports() {
            return true;
        }

        @Override
        public List protocols() {
            return protocols;
        }

        @Override
        public void unsupported() {
            ALPN.remove(sslEngine);
            selected = "";
        }

        @Override
        public void selected(String s) {
            ALPN.remove(sslEngine);
            selected = s;
            sslEngine.getHandshakeSession().putValue(PROTOCOL_KEY, selected);
        }
    }

    @Override
    public String toString() {
        return "JettyAlpnProvider";
    }
}