/**
 * Copyright (c) Istituto Nazionale di Fisica Nucleare (INFN). 2006-2016
 *
 * 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.glite.security.voms.admin.servlets;

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 javax.servlet.http.HttpServletResponse;

import org.glite.security.voms.admin.configuration.VOMSConfiguration;

public class WebappDisabledFilter implements Filter {

  private String DISABLED_MESSAGE;

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

    DISABLED_MESSAGE = String.format(
      "VOMS Admin web application is disabled for VO %s",
      VOMSConfiguration.instance()
        .getVOName());

  }

  private boolean isAllowedRequest(HttpServletRequest req) {
    // Allow requests 
    String requestURI = req.getRequestURI();
    
    if (requestURI.startsWith("/services")){
      return true;
    }
    
    return false;
  }

  @Override
  public void doFilter(ServletRequest request, ServletResponse response,
    FilterChain chain) throws IOException, ServletException {

    HttpServletRequest req = (HttpServletRequest) request;
    HttpServletResponse res = (HttpServletResponse) response;
    
    if (isAllowedRequest(req)){
      chain.doFilter(request, response);
    } else {
      res.setStatus(HttpServletResponse.SC_OK);
      res.getWriter().println(DISABLED_MESSAGE);
    }
  }

  @Override
  public void destroy() {
  }

}