JdkAlpnSslEngine.java — netty Source File

Source Code

/*
 * Copyright 2017 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 io.netty.util.internal.StringUtil;

import java.nio.ByteBuffer;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.function.BiConsumer;
import java.util.function.BiFunction;
import javax.net.ssl.SSLEngine;
import javax.net.ssl.SSLEngineResult;
import javax.net.ssl.SSLException;

import static io.netty.handler.ssl.JdkApplicationProtocolNegotiator.ProtocolSelectionListener;
import static io.netty.handler.ssl.JdkApplicationProtocolNegotiator.ProtocolSelector;
import static io.netty.handler.ssl.SslUtils.toSSLHandshakeException;

class JdkAlpnSslEngine extends JdkSslEngine {
    private final ProtocolSelectionListener selectionListener;
    private final AlpnSelector alpnSelector;

    final class AlpnSelector implements BiFunction<SSLEngine, List<String>, String> {
        private final ProtocolSelector selector;
        private boolean called;

        AlpnSelector(ProtocolSelector selector) {
            this.selector = selector;
        }

        @Override
        public String apply(SSLEngine sslEngine, List<String> strings) {
            assert !called;
            called = true;

            try {
                String selected = selector.select(strings);
                return selected == null ? StringUtil.EMPTY_STRING : selected;
            } catch (Exception cause) {
                // Returning null means we want to fail the handshake.
                //
                // See https://download.java.net/java/jdk9/docs/api/javax/net/ssl/
                // SSLEngine.html#setHandshakeApplicationProtocolSelector-java.util.function.BiFunction-
                return null;
            }
        }
// ... (149 more lines)