org.jdal.auth.AuthFilter.java Source code

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Here is the source code for org.jdal.auth.AuthFilter.java

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/*
 * Copyright 2008-2010 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 org.jdal.auth;

import java.io.IOException;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.filter.OncePerRequestFilter;

/**
 * Servlet 2.3 Filter  for simple session auth
 * 
 * @author Jose Luis Martin.
 * @since 1.0
 */
public class AuthFilter extends OncePerRequestFilter {

    public static String SESSION_USER_KEY = "AUTHFILTER_USER";
    private static String loginPage = "/login.jsp";

    public void destroy() {

    }

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain chain)
            throws ServletException, IOException {
        HttpServletRequest req = (HttpServletRequest) request;
        HttpServletResponse res = (HttpServletResponse) response;

        if (!isLoginPage(req) && req.getSession().getAttribute(SESSION_USER_KEY) == null) {
            // not authorized
            res.sendRedirect(req.getContextPath() + "/" + loginPage);
        } else {
            // authorized
            chain.doFilter(request, response);
        }

    }

    protected boolean isLoginPage(HttpServletRequest request) {
        return ("/login.jsp".equals(request.getServletPath()) || "/login.do".equals(request.getServletPath()));
    }

}