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/**
 *  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.geronimo.tomcat.valve;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.security.auth.Subject;

import org.apache.catalina.valves.ValveBase;
import org.apache.catalina.connector.Request;
import org.apache.catalina.connector.Response;
import org.apache.geronimo.security.ContextManager;
import org.apache.geronimo.security.Callers;

/**
 * @version $Rev: 476049 $ $Date: 2006-11-17 12:35:17 +0800 (Fri, 17 Nov 2006) $
 */
public class DefaultSubjectValve extends ValveBase {

    private final Subject defaultSubject;

    public DefaultSubjectValve(Subject defaultSubject) {
        this.defaultSubject = defaultSubject;
    }

    public void invoke(Request request, Response response) throws IOException, ServletException {
        Callers oldCallers = null;
        boolean setSubject = false;
        if (defaultSubject != null) {
            oldCallers = ContextManager.getCallers();
            setSubject = oldCallers == null || oldCallers.getCurrentCaller() == null;
        }
        if (setSubject) {
            ContextManager.setCallers(defaultSubject, defaultSubject);
            try {
                getNext().invoke(request, response);
            } finally {
                ContextManager.popCallers(oldCallers);
            }
        } else {
            getNext().invoke(request, response);
        }

    }
}