//
   //  ========================================================================
   //  Copyright (c) 1995-2013 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.servlet;
  
  import java.net.HttpCookie;
  import java.net.InetSocketAddress;
  import java.net.URISyntaxException;
  import java.security.Principal;
  import java.security.cert.X509Certificate;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.Enumeration;
  import java.util.HashMap;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Map;
  
  import javax.servlet.http.Cookie;
  import javax.servlet.http.HttpServletRequest;
  
  import org.eclipse.jetty.websocket.api.UpgradeRequest;
  import org.eclipse.jetty.websocket.api.extensions.ExtensionConfig;
  import org.eclipse.jetty.websocket.api.util.QuoteUtil;
  import org.eclipse.jetty.websocket.api.util.WSURI;
  
  /**
   * Servlet specific {@link UpgradeRequest} implementation.
   */
  public class ServletUpgradeRequest extends UpgradeRequest
  {
      private HttpServletRequest req;
  
      public ServletUpgradeRequest(HttpServletRequest request) throws URISyntaxException
      {
          super(WSURI.toWebsocket(request.getRequestURL(),request.getQueryString()));
          this.req = request;
  
          // Copy Request Line Details
          setMethod(request.getMethod());
          setHttpVersion(request.getProtocol());
  
          // Copy parameters
          Map<String, List<String>> pmap = new HashMap<>();
          if (request.getParameterMap() != null)
          {
              for (Map.Entry<String, String[]> entry : request.getParameterMap().entrySet())
              {
                  pmap.put(entry.getKey(),Arrays.asList(entry.getValue()));
              }
          }
          super.setParameterMap(pmap);
  
          // Copy Cookies
          Cookie rcookies[] = request.getCookies();
          if (rcookies != null)
          {
              List<HttpCookie> cookies = new ArrayList<>();
              for (Cookie rcookie : rcookies)
              {
                  HttpCookie hcookie = new HttpCookie(rcookie.getName(),rcookie.getValue());
                  // no point handling domain/path/expires/secure/httponly on client request cookies
                  cookies.add(hcookie);
              }
              super.setCookies(cookies);
          }
  
          // Copy Headers
          Enumeration<String> headerNames = request.getHeaderNames();
          while (headerNames.hasMoreElements())
          {
              String name = headerNames.nextElement();
              List<String> values = Collections.list(request.getHeaders(name));
              setHeader(name,values);
          }
  
          // Parse Sub Protocols
          Enumeration<String> protocols = request.getHeaders("Sec-WebSocket-Protocol");
          List<String> subProtocols = new ArrayList<>();
          String protocol = null;
          while ((protocol == null) && (protocols != null) && protocols.hasMoreElements())
          {
              String candidate = protocols.nextElement();
             for (String p : parseProtocols(candidate))
             {
                 subProtocols.add(p);
             }
         }
         setSubProtocols(subProtocols);
 
         // Parse Extension Configurations
         Enumeration<String> e = request.getHeaders("Sec-WebSocket-Extensions");
         while (e.hasMoreElements())
         {
             Iterator<String> extTokenIter = QuoteUtil.splitAt(e.nextElement(),",");
             while (extTokenIter.hasNext())
             {
                 String extToken = extTokenIter.next();
                 ExtensionConfig config = ExtensionConfig.parse(extToken);
                 addExtensions(config);
             }
         }
     }
 
     public X509Certificate[] getCertificates()
     {
         return (X509Certificate[])req.getAttribute("javax.servlet.request.X509Certificate");
     }
 
     /**
      * Equivalent to {@link HttpServletRequest#getLocalAddr()}
      * 
      * @return the local address
      */
     public String getLocalAddress()
     {
         return req.getLocalAddr();
     }
 
     /**
      * Equivalent to {@link HttpServletRequest#getLocalName()}
      * 
      * @return the local host name
      */
     public String getLocalHostName()
     {
         return req.getLocalName();
     }
 
     /**
      * Equivalent to {@link HttpServletRequest#getLocalPort()}
      * 
      * @return the local port
      */
     public int getLocalPort()
     {
         return req.getLocalPort();
     }
 
     /**
      * Return a {@link InetSocketAddress} for the local socket.
      * <p>
      * Warning: this can cause a DNS lookup
      * 
      * @return the local socket address
      */
     public InetSocketAddress getLocalSocketAddress()
     {
         return new InetSocketAddress(req.getLocalAddr(),req.getLocalPort());
     }
 
     public Principal getPrincipal()
     {
         return req.getUserPrincipal();
     }
 
     /**
      * Equivalent to {@link HttpServletRequest#getRemoteAddr()}
      * 
      * @return the remote address
      */
     public String getRemoteAddress()
     {
         return req.getRemoteAddr();
     }
 
     /**
      * Equivalent to {@link HttpServletRequest#getRemoteHost()}
      * 
      * @return the remote host name
      */
     public String getRemoteHostName()
     {
         return req.getRemoteHost();
     }
 
     /**
      * Equivalent to {@link HttpServletRequest#getRemotePort()}
      * 
      * @return the remote port
      */
     public int getRemotePort()
     {
         return req.getRemotePort();
     }
 
     /**
      * Return a {@link InetSocketAddress} for the remote socket.
      * <p>
      * Warning: this can cause a DNS lookup
      * 
      * @return the remote socket address
      */
     public InetSocketAddress getRemoteSocketAddress()
     {
         return new InetSocketAddress(req.getRemoteAddr(),req.getRemotePort());
     }
 
     public Map<String, Object> getServletAttributes()
     {
         Map<String, Object> attributes = new HashMap<String, Object>();
 
         for (String name : Collections.list(req.getAttributeNames()))
         {
             attributes.put(name,req.getAttribute(name));
         }
 
         return attributes;
     }
 
     public Map<String, List<String>> getServletParameters()
     {
         Map<String, List<String>> parameters = new HashMap<String, List<String>>();
 
         for (String name : Collections.list(req.getParameterNames()))
         {
             parameters.put(name,Collections.unmodifiableList(Arrays.asList(req.getParameterValues(name))));
         }
 
         return parameters;
     }
 
     /**
      * Return the HttpSession if it exists.
      * <p>
      * Note: this is equivalent to {@link HttpServletRequest#getSession()} and will not create a new HttpSession.
      */
     @Override
     public Object getSession()
     {
         return this.req.getSession(false);
     }
 
     protected String[] parseProtocols(String protocol)
     {
         if (protocol == null)
         {
             return new String[] {};
         }
         protocol = protocol.trim();
         if ((protocol == null) || (protocol.length() == 0))
         {
             return new String[] {};
         }
         String[] passed = protocol.split("\\s*,\\s*");
         String[] protocols = new String[passed.length];
         System.arraycopy(passed,0,protocols,0,passed.length);
         return protocols;
     }
 
     public void setServletAttribute(String name, Object o)
     {
         this.req.setAttribute(name,o);
     }
 
     public Object getServletAttribute(String name)
     {
         return req.getAttribute(name);
     }
 
     public boolean isUserInRole(String role)
     {
         return req.isUserInRole(role);
     }
 
     public String getRequestPath()
     {
         // Since this can be called from a filter, we need to be smart about determining the target request path
         String contextPath = req.getContextPath();
         String requestPath = req.getRequestURI();
         if (requestPath.startsWith(contextPath))
         {
             requestPath = requestPath.substring(contextPath.length());
         }
 
         return requestPath;
     }
 }