//
   //  ========================================================================
   //  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.websocket.server;
  
  import java.io.IOException;
  
  import javax.servlet.ServletException;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  import org.eclipse.jetty.http.pathmap.MappedResource;
  import org.eclipse.jetty.http.pathmap.PathMappings;
  import org.eclipse.jetty.http.pathmap.PathSpec;
  import org.eclipse.jetty.io.ByteBufferPool;
  import org.eclipse.jetty.io.MappedByteBufferPool;
  import org.eclipse.jetty.server.Request;
  import org.eclipse.jetty.server.handler.HandlerWrapper;
  import org.eclipse.jetty.websocket.servlet.WebSocketCreator;
  
  public class WebSocketUpgradeHandlerWrapper extends HandlerWrapper implements MappedWebSocketCreator
  {
      private PathMappings<WebSocketCreator> pathmap = new PathMappings<>();
      private final WebSocketServerFactory factory;
  
      public WebSocketUpgradeHandlerWrapper()
      {
          this(new MappedByteBufferPool());
      }
      
      public WebSocketUpgradeHandlerWrapper(ByteBufferPool bufferPool)
      {
          factory = new WebSocketServerFactory(bufferPool);
      }
  
      @Override
      public void addMapping(PathSpec spec, WebSocketCreator creator)
      {
          pathmap.put(spec,creator);
      }
  
      @Override
      public PathMappings<WebSocketCreator> getMappings()
      {
          return pathmap;
      }
  
      @Override
      public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
      {
          if (factory.isUpgradeRequest(request,response))
          {
              MappedResource<WebSocketCreator> resource = pathmap.getMatch(target);
              if (resource == null)
              {
                  // no match.
                  response.sendError(HttpServletResponse.SC_NOT_FOUND,"No websocket endpoint matching path: " + target);
                  return;
              }
  
              WebSocketCreator creator = resource.getResource();
  
              // Store PathSpec resource mapping as request attribute
              request.setAttribute(PathSpec.class.getName(),resource);
  
              // We have an upgrade request
              if (factory.acceptWebSocket(creator,request,response))
              {
                  // We have a socket instance created
                  return;
              }
  
              // If we reach this point, it means we had an incoming request to upgrade
              // but it was either not a proper websocket upgrade, or it was possibly rejected
              // due to incoming request constraints (controlled by WebSocketCreator)
              if (response.isCommitted())
              {
                  // not much we can do at this point.
                  return;
              }
          }
          super.handle(target,baseRequest,request,response);
      }
  }