io.netty.handler.ssl.JdkBaseApplicationProtocolNegotiator Maven / Gradle / Ivy

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This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and Jakarta Messaging 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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/*
 * Copyright 2014 The Netty Project
 *
 * The Netty Project licenses this file to you 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:
 *
 *   https://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.netty.handler.ssl;

import static io.netty.handler.ssl.ApplicationProtocolUtil.toList;
import static io.netty.util.internal.ObjectUtil.checkNotNull;

import java.util.Collections;
import java.util.List;
import java.util.Set;

import javax.net.ssl.SSLEngine;
import javax.net.ssl.SSLHandshakeException;

/**
 * Common base class for {@link JdkApplicationProtocolNegotiator} classes to inherit from.
 */
class JdkBaseApplicationProtocolNegotiator implements JdkApplicationProtocolNegotiator {
    private final List protocols;
    private final ProtocolSelectorFactory selectorFactory;
    private final ProtocolSelectionListenerFactory listenerFactory;
    private final SslEngineWrapperFactory wrapperFactory;

    /**
     * Create a new instance.
     * @param wrapperFactory Determines which application protocol will be used by wrapping the SSLEngine in use.
     * @param selectorFactory How the peer selecting the protocol should behave.
     * @param listenerFactory How the peer being notified of the selected protocol should behave.
     * @param protocols The order of iteration determines the preference of support for protocols.
     */
    JdkBaseApplicationProtocolNegotiator(SslEngineWrapperFactory wrapperFactory,
            ProtocolSelectorFactory selectorFactory, ProtocolSelectionListenerFactory listenerFactory,
            Iterable protocols) {
        this(wrapperFactory, selectorFactory, listenerFactory, toList(protocols));
    }

    /**
     * Create a new instance.
     * @param wrapperFactory Determines which application protocol will be used by wrapping the SSLEngine in use.
     * @param selectorFactory How the peer selecting the protocol should behave.
     * @param listenerFactory How the peer being notified of the selected protocol should behave.
     * @param protocols The order of iteration determines the preference of support for protocols.
     */
    JdkBaseApplicationProtocolNegotiator(SslEngineWrapperFactory wrapperFactory,
            ProtocolSelectorFactory selectorFactory, ProtocolSelectionListenerFactory listenerFactory,
            String... protocols) {
        this(wrapperFactory, selectorFactory, listenerFactory, toList(protocols));
    }

    /**
     * Create a new instance.
     * @param wrapperFactory Determines which application protocol will be used by wrapping the SSLEngine in use.
     * @param selectorFactory How the peer selecting the protocol should behave.
     * @param listenerFactory How the peer being notified of the selected protocol should behave.
     * @param protocols The order of iteration determines the preference of support for protocols.
     */
    private JdkBaseApplicationProtocolNegotiator(SslEngineWrapperFactory wrapperFactory,
            ProtocolSelectorFactory selectorFactory, ProtocolSelectionListenerFactory listenerFactory,
            List protocols) {
        this.wrapperFactory = checkNotNull(wrapperFactory, "wrapperFactory");
        this.selectorFactory = checkNotNull(selectorFactory, "selectorFactory");
        this.listenerFactory = checkNotNull(listenerFactory, "listenerFactory");
        this.protocols = Collections.unmodifiableList(checkNotNull(protocols, "protocols"));
    }

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

    @Override
    public ProtocolSelectorFactory protocolSelectorFactory() {
        return selectorFactory;
    }

    @Override
    public ProtocolSelectionListenerFactory protocolListenerFactory() {
        return listenerFactory;
    }

    @Override
    public SslEngineWrapperFactory wrapperFactory() {
        return wrapperFactory;
    }

    static final ProtocolSelectorFactory FAIL_SELECTOR_FACTORY = new ProtocolSelectorFactory() {
        @Override
        public ProtocolSelector newSelector(SSLEngine engine, Set supportedProtocols) {
            return new FailProtocolSelector((JdkSslEngine) engine, supportedProtocols);
        }
    };

    static final ProtocolSelectorFactory NO_FAIL_SELECTOR_FACTORY = new ProtocolSelectorFactory() {
        @Override
        public ProtocolSelector newSelector(SSLEngine engine, Set supportedProtocols) {
            return new NoFailProtocolSelector((JdkSslEngine) engine, supportedProtocols);
        }
    };

    static final ProtocolSelectionListenerFactory FAIL_SELECTION_LISTENER_FACTORY =
            new ProtocolSelectionListenerFactory() {
        @Override
        public ProtocolSelectionListener newListener(SSLEngine engine, List supportedProtocols) {
            return new FailProtocolSelectionListener((JdkSslEngine) engine, supportedProtocols);
        }
    };

    static final ProtocolSelectionListenerFactory NO_FAIL_SELECTION_LISTENER_FACTORY =
            new ProtocolSelectionListenerFactory() {
        @Override
        public ProtocolSelectionListener newListener(SSLEngine engine, List supportedProtocols) {
            return new NoFailProtocolSelectionListener((JdkSslEngine) engine, supportedProtocols);
        }
    };

    static class NoFailProtocolSelector implements ProtocolSelector {
        private final JdkSslEngine engineWrapper;
        private final Set supportedProtocols;

        NoFailProtocolSelector(JdkSslEngine engineWrapper, Set supportedProtocols) {
            this.engineWrapper = engineWrapper;
            this.supportedProtocols = supportedProtocols;
        }

        @Override
        public void unsupported() {
            engineWrapper.setNegotiatedApplicationProtocol(null);
        }

        @Override
        public String select(List protocols) throws Exception {
            for (String p : supportedProtocols) {
                if (protocols.contains(p)) {
                    engineWrapper.setNegotiatedApplicationProtocol(p);
                    return p;
                }
            }
            return noSelectMatchFound();
        }

        public String noSelectMatchFound() throws Exception {
            engineWrapper.setNegotiatedApplicationProtocol(null);
            return null;
        }
    }

    private static final class FailProtocolSelector extends NoFailProtocolSelector {
        FailProtocolSelector(JdkSslEngine engineWrapper, Set supportedProtocols) {
            super(engineWrapper, supportedProtocols);
        }

        @Override
        public String noSelectMatchFound() throws Exception {
            throw new SSLHandshakeException("Selected protocol is not supported");
        }
    }

    private static class NoFailProtocolSelectionListener implements ProtocolSelectionListener {
        private final JdkSslEngine engineWrapper;
        private final List supportedProtocols;

        NoFailProtocolSelectionListener(JdkSslEngine engineWrapper, List supportedProtocols) {
            this.engineWrapper = engineWrapper;
            this.supportedProtocols = supportedProtocols;
        }

        @Override
        public void unsupported() {
            engineWrapper.setNegotiatedApplicationProtocol(null);
        }

        @Override
        public void selected(String protocol) throws Exception {
            if (supportedProtocols.contains(protocol)) {
                engineWrapper.setNegotiatedApplicationProtocol(protocol);
            } else {
                noSelectedMatchFound(protocol);
            }
        }

        protected void noSelectedMatchFound(String protocol) throws Exception {
            // Will never be called.
        }
    }

    private static final class FailProtocolSelectionListener extends NoFailProtocolSelectionListener {
        FailProtocolSelectionListener(JdkSslEngine engineWrapper, List supportedProtocols) {
            super(engineWrapper, supportedProtocols);
        }

        @Override
        protected void noSelectedMatchFound(String protocol) throws Exception {
            throw new SSLHandshakeException("No compatible protocols found");
        }
    }
}