/*
 * 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.solr.security;

import java.io.IOException;
import java.util.Locale;

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.apache.hadoop.security.authentication.server.AuthenticationFilter;
import org.apache.hadoop.security.authentication.server.AuthenticationHandler;

public class KerberosFilter extends AuthenticationFilter {

  private final Locale defaultLocale = Locale.getDefault();

  @Override
  public void init(FilterConfig conf) throws ServletException {
    super.init(conf);
  }

  @Override
  protected void initializeAuthHandler(String authHandlerClassName,
                                       FilterConfig filterConfig) throws ServletException {
    // set the internal authentication handler in order to record whether the request should continue
    super.initializeAuthHandler(authHandlerClassName, filterConfig);
    AuthenticationHandler authHandler = getAuthenticationHandler();
    super.initializeAuthHandler(
        RequestContinuesRecorderAuthenticationHandler.class.getName(), filterConfig);
    RequestContinuesRecorderAuthenticationHandler newAuthHandler =
        (RequestContinuesRecorderAuthenticationHandler)getAuthenticationHandler();
    newAuthHandler.setAuthHandler(authHandler);
  }

  @Override
  protected void doFilter(FilterChain filterChain, HttpServletRequest request,
      HttpServletResponse response) throws IOException, ServletException {
    Locale.setDefault(defaultLocale);
    super.doFilter(filterChain, request, response);
  }
  
  @Override
  public void doFilter(ServletRequest request, ServletResponse response,
      FilterChain filterChain) throws IOException, ServletException {
    // A hack until HADOOP-15681 get committed
    Locale.setDefault(Locale.US);
    super.doFilter(request, response, filterChain);
  }
}
