/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF 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
    *
   *   http://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 org.apache.myfaces.application.viewstate.token;
  
  import java.io.UnsupportedEncodingException;
  import javax.faces.FacesException;
  import javax.faces.context.FacesContext;
  import org.apache.myfaces.shared.util.StateUtils;
  
  /**
   *
   * @author Thomas Andraschko
   */
  public class ServiceSideStateTokenProcessor extends StateTokenProcessor
  {
      @Override
      public Object decode(FacesContext facesContext, String token)
      {
          if (STATELESS_TOKEN.equals(token))
          {
              // Should not happen, because ResponseStateManager.isStateless(context,viewId) should
              // catch it first
              return null;
          }
  
          try
          {
              byte[] tokenBytes = token.getBytes(StateUtils.ZIP_CHARSET);
              byte[] tokenBytesDecoded = StateUtils.decode(tokenBytes);
              String tokenDecoded = new String(tokenBytesDecoded, StateUtils.ZIP_CHARSET);
  
              return tokenDecoded;
          }
          catch (UnsupportedEncodingException e)
          {
              throw new FacesException(e);
          }
  
      }
  
      @Override
      public String encode(FacesContext facesContext, Object savedStateObject)
      {
          if (facesContext.getViewRoot().isTransient())
          {
              return STATELESS_TOKEN;
          }
  
          try
          {
              // string from #encodeSerializedState
              String token = (String) savedStateObject;
              byte[] tokenBytes = token.getBytes(StateUtils.ZIP_CHARSET);
              byte[] tokenBytesEncoded = StateUtils.encode(tokenBytes);
              String tokenEncoded = new String(tokenBytesEncoded, StateUtils.ZIP_CHARSET);
  
              return tokenEncoded;
          }
          catch (UnsupportedEncodingException e)
          {
              throw new FacesException(e);
          }
      }
  }