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A barebones WebSocket client and server implementation written 100% in Java
There is a newer version: 1.5.7
/*
 * Copyright (c) 2010-2020 Nathan Rajlich
 *
 *  Permission is hereby granted, free of charge, to any person
 *  obtaining a copy of this software and associated documentation
 *  files (the "Software"), to deal in the Software without
 *  restriction, including without limitation the rights to use,
 *  copy, modify, merge, publish, distribute, sublicense, and/or sell
 *  copies of the Software, and to permit persons to whom the
 *  Software is furnished to do so, subject to the following
 *  conditions:
 *
 *  The above copyright notice and this permission notice shall be
 *  included in all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 *  OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 *  HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 *  WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 *  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 *  OTHER DEALINGS IN THE SOFTWARE.
 */

package org.java_websocket.server;

import java.io.IOException;
import java.nio.channels.ByteChannel;
import java.nio.channels.SelectionKey;
import java.nio.channels.SocketChannel;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLEngine;
import org.java_websocket.SSLSocketChannel2;
import org.java_websocket.WebSocketAdapter;
import org.java_websocket.WebSocketImpl;
import org.java_websocket.WebSocketServerFactory;
import org.java_websocket.drafts.Draft;

public class DefaultSSLWebSocketServerFactory implements WebSocketServerFactory {

  protected SSLContext sslcontext;
  protected ExecutorService exec;

  public DefaultSSLWebSocketServerFactory(SSLContext sslContext) {
    this(sslContext, Executors.newSingleThreadScheduledExecutor());
  }

  public DefaultSSLWebSocketServerFactory(SSLContext sslContext, ExecutorService exec) {
    if (sslContext == null || exec == null) {
      throw new IllegalArgumentException();
    }
    this.sslcontext = sslContext;
    this.exec = exec;
  }

  @Override
  public ByteChannel wrapChannel(SocketChannel channel, SelectionKey key) throws IOException {
    SSLEngine e = sslcontext.createSSLEngine();
    /*
     * See https://github.com/TooTallNate/Java-WebSocket/issues/466
     *
     * We remove TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 from the enabled ciphers since it is just available when you patch your java installation directly.
     * E.g. firefox requests this cipher and this causes some dcs/instable connections
     */
    List ciphers = new ArrayList<>(Arrays.asList(e.getEnabledCipherSuites()));
    ciphers.remove("TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256");
    e.setEnabledCipherSuites(ciphers.toArray(new String[ciphers.size()]));
    e.setUseClientMode(false);
    return new SSLSocketChannel2(channel, e, exec, key);
  }

  @Override
  public WebSocketImpl createWebSocket(WebSocketAdapter a, Draft d) {
    return new WebSocketImpl(a, d);
  }

  @Override
  public WebSocketImpl createWebSocket(WebSocketAdapter a, List d) {
    return new WebSocketImpl(a, d);
  }

  @Override
  public void close() {
    exec.shutdown();
  }
}