/*
 *
 * 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.qpid.server.management.plugin.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;

/**
 * Filter is active when context variable "qpid.httpManagement.serveUncompressedDojo" has value true.
 *
 * It redirects request from regular dojo file to uncompressed dojo file,
 * e.g. /dojo/dojo.js => /dojo/dojo.js.uncompressed.js
 *
 * Is used mostly for debug purposes.
 */
public class RewriteRequestForUncompressedJavascript implements Filter
{

    public static final String UNCOMPRESSED_JS_SUFFIX = ".uncompressed.js";
    public static final String JS_SUFFIX = ".js";

    @Override
    public void init(final FilterConfig filterConfig) throws ServletException
    {
    }

    @Override
    public void destroy()
    {
    }

    @Override
    public void doFilter(final ServletRequest request,
                         final ServletResponse response,
                         final FilterChain chain) throws IOException, ServletException
    {
        final String requestURI = ((HttpServletRequest) request).getRequestURI();
        if (requestURI.endsWith(JS_SUFFIX) && !requestURI.endsWith(UNCOMPRESSED_JS_SUFFIX) && !requestURI.contains("../"))
        {
            final String uncompressedJsUri = requestURI + UNCOMPRESSED_JS_SUFFIX;
            request.getRequestDispatcher(uncompressedJsUri).forward(request, response);
        }
        else
        {
            chain.doFilter(request, response);
        }
    }
}