//
   //  ========================================================================
   //  Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd.
   //  ------------------------------------------------------------------------
   //  All rights reserved. This program and the accompanying materials
   //  are made available under the terms of the Eclipse Public License v1.0
   //  and Apache License v2.0 which accompanies this distribution.
   //
   //      The Eclipse Public License is available at
  //      http://www.eclipse.org/legal/epl-v10.html
  //
  //      The Apache License v2.0 is available at
  //      http://www.opensource.org/licenses/apache2.0.php
  //
  //  You may elect to redistribute this code under either of these licenses.
  //  ========================================================================
  //
  
  package org.eclipse.jetty.http2.server;
  
  import org.eclipse.jetty.http.BadMessageException;
  import org.eclipse.jetty.http.HttpFields;
  import org.eclipse.jetty.http.MetaData.Request;
  import org.eclipse.jetty.io.Connection;
  import org.eclipse.jetty.io.EndPoint;
  import org.eclipse.jetty.server.ConnectionFactory;
  import org.eclipse.jetty.server.Connector;
  import org.eclipse.jetty.server.HttpConfiguration;
  import org.eclipse.jetty.server.HttpConnectionFactory;
  import org.eclipse.jetty.util.annotation.Name;
  import org.eclipse.jetty.util.log.Log;
  import org.eclipse.jetty.util.log.Logger;
  
  
  /* ------------------------------------------------------------ */
  /** HTTP2 Clear Text Connection factory.
   * <p>This extension of HTTP2ServerConnection Factory sets the
   * protocol name to "h2c" as used by the clear text upgrade mechanism
   * for HTTP2 and marks all TLS ciphers as unacceptable.
   * </p>
   * <p>If used in combination with a {@link HttpConnectionFactory} as the
   * default protocol, this factory can support the non-standard direct
   * update mechanism, where a HTTP1 request of the form "PRI * HTTP/2.0"
   * is used to trigger a switch to a HTTP2 connection.    This approach
   * allows a single port to accept either HTTP/1 or HTTP/2 direct
   * connections.
   */
  public class HTTP2CServerConnectionFactory extends HTTP2ServerConnectionFactory implements ConnectionFactory.Upgrading
  {
      private static final Logger LOG = Log.getLogger(HTTP2CServerConnectionFactory.class);
  
      public HTTP2CServerConnectionFactory(@Name("config") HttpConfiguration httpConfiguration)
      {
          super(httpConfiguration,"h2c","h2c-17","h2c-16","h2c-15","h2c-14");
      }
  
      @Override
      public boolean isAcceptable(String protocol, String tlsProtocol, String tlsCipher)
      {
          // Never use TLS with h2c
          return false;
      }
  
      @Override
      public Connection upgradeConnection(Connector connector, EndPoint endPoint, Request request, HttpFields response101) throws BadMessageException
      {
          if (LOG.isDebugEnabled())
              LOG.debug("{} upgraded {}{}", this, request.toString(), request.getFields());
  
          if (request.getContentLength() > 0)
              return null;
  
          HTTP2ServerConnection connection = (HTTP2ServerConnection)newConnection(connector, endPoint);
          if (connection.upgrade(request))
              return connection;
          return null;
      }
  }