/*
 *  eXist Open Source Native XML Database
 *  Copyright (C) 2011 The eXist Project
 *  http://exist-db.org
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public License
 *  as published by the Free Software Foundation; either version 2
 *  of the License, or (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 *  $Id$
 */
package org.exist.webdav;

import com.bradmcevoy.http.MiltonServlet;
import com.bradmcevoy.http.http11.DefaultHttp11ResponseHandler;

import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

/**
 *  Wrapper around the MiltonServlet for post-configuring the framework.
 * 
 * @author Dannes Wessels
 */
public class MiltonWebDAVServlet extends MiltonServlet {

    protected final static Logger LOG = LogManager.getLogger(MiltonWebDAVServlet.class);
    
    public static String POM_PROP="/META-INF/maven/com.ettrema/milton-api/pom.properties";

    @Override
    public void init(ServletConfig config) throws ServletException {
        
        LOG.info("Initializing webdav servlet");
        
        // Show used version
        Properties props = new Properties();
        try {
            InputStream is = DefaultHttp11ResponseHandler.class.getResourceAsStream(POM_PROP);           
            if(is==null){
                LOG.error("Could not read the file milton.properties");
            } else {
                props.load(is);
            }
            
        } catch (IOException ex) {
            LOG.warn("Failed to load milton properties file", ex);
        }
        String miltonVersion = props.getProperty("version");

        if (miltonVersion == null) {
            LOG.error("Unable to determine Milton version");
        } else {
            LOG.info("Detected Milton WebDAV Server library version: " + miltonVersion);
        }
        
        // Initialize Milton
        super.init(config);

        // Retrieve parameters, set to FALSE if not existent
        String enableInitParameter = config.getInitParameter("enable.expect.continue");     
        if(enableInitParameter==null){
           enableInitParameter="FALSE"; 
        }
        
        // Calculate effective value
        boolean enableExpectContinue = "TRUE".equalsIgnoreCase(enableInitParameter);

        // Pass value to Milton
        httpManager.setEnableExpectContinue(enableExpectContinue);
        
        LOG.debug(String.format("Set 'Enable Expect Continue' to %s", enableExpectContinue));
    }
}