/**
 * 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.hadoop.metadata.web.filters;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

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 java.io.IOException;

/**
 * This enforces authentication as part of the filter before processing the request.
 * todo: Subclass of {@link org.apache.hadoop.security.authentication.server.AuthenticationFilter}.
 */
public class AuthenticationFilter implements Filter {
    private static final Logger LOG = LoggerFactory.getLogger(AuthenticationFilter.class);

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        LOG.info("AuthenticationFilter initialization started");
    }

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

    @Override
    public void destroy() {
        // do nothing
    }
}
