impl/src/main/java/org/apache/myfaces/application/viewstate/StateTokenProcessorServerSide.java

/*
 * 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;

import java.io.UnsupportedEncodingException;
import jakarta.faces.FacesException;
import jakarta.faces.context.FacesContext;

/**
 *
 * @author Thomas Andraschko
 */
public class StateTokenProcessorServerSide 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);
        }
    }
}