com.earldouglas.filtre.Filtre.java Source code

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Here is the source code for com.earldouglas.filtre.Filtre.java

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/*
 * Copyright 2010 the original author or authors.
 *
 * Licensed 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 com.earldouglas.filtre;

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;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class Filtre implements Filter {

    private Log log = LogFactory.getLog(getClass());
    private AddressManager addressManager = new AddressManager();

    public void init(FilterConfig filterConfig) throws ServletException {
        try {
            if (filterConfig.getInitParameter("whiteList") == null
                    && filterConfig.getInitParameter("blackList") == null
                    && filterConfig.getInitParameter("configLocation") == null) {
                useConfigLocation("classpath:filtre.properties");
            } else {
                addressManager.extendWhiteList(filterConfig.getInitParameter("whiteList"));
                addressManager.extendBlackList(filterConfig.getInitParameter("blackList"));
                useConfigLocation(filterConfig.getInitParameter("configLocation"));
            }
        } catch (AddressFormatException addressFormatException) {
            throw new ServletException(addressFormatException);
        }
    }

    private void useConfigLocation(String configLocation) throws AddressFormatException {
        ConfigReader configReader = new ConfigReader(configLocation);
        addressManager.extendWhiteList(configReader.getCompositeWhiteList());
        addressManager.extendBlackList(configReader.getCompositeBlackList());
    }

    public void destroy() {
    }

    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
            throws IOException, ServletException {

        boolean accessGranted = false;
        try {
            accessGranted = addressManager.isAccessPermitted(servletRequest.getRemoteAddr());
        } catch (AddressFormatException addressFormatException) {
            throw new ServletException(addressFormatException);
        } finally {
            logResult(servletRequest, accessGranted);
            if (accessGranted) {
                filterChain.doFilter(servletRequest, servletResponse);
            }
        }
    }

    private void logResult(ServletRequest servletRequest, boolean accessGranted) {
        StringBuffer logStringBuffer = new StringBuffer();
        logStringBuffer.append("Access ");

        if (servletRequest instanceof HttpServletRequest) {
            HttpServletRequest httpServletRequest = (HttpServletRequest) servletRequest;

            logStringBuffer.append(" to '");
            logStringBuffer.append(httpServletRequest.getRequestURI());
            logStringBuffer.append("' ");
        }

        logStringBuffer.append("from ");
        logStringBuffer.append(servletRequest.getRemoteAddr());
        logStringBuffer.append(" ");

        if (accessGranted) {
            logStringBuffer.append("granted.");
        } else {
            logStringBuffer.append("denied.");
        }

        log.info(logStringBuffer);
    }
}