/**
 * 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.atlas.web.security;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.codehaus.jackson.map.ObjectMapper;
import org.json.simple.JSONObject;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.web.authentication.AuthenticationFailureHandler;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;


public class AtlasAuthenticationFailureHandler implements AuthenticationFailureHandler {

    private static Logger LOG = LoggerFactory.getLogger(AtlasAuthenticationFailureHandler.class);

    @Override
    public void onAuthenticationFailure(HttpServletRequest httpServletRequest, HttpServletResponse response,
                                        AuthenticationException e) throws IOException, ServletException {


        LOG.debug("Login Failure ", e);

        JSONObject json = new JSONObject();
        ObjectMapper mapper = new ObjectMapper();
        json.put("msgDesc", e.getMessage());

        String jsonAsStr = mapper.writeValueAsString(json);
        response.setContentType("application/json");
        response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
        response.setCharacterEncoding("UTF-8");
        response.getWriter().write(jsonAsStr);

    }
}
