/*
 * Copyright (c) 2023 LY.com All Rights Reserved.
 *
 * 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 com.ly.ckibana.configure.web.filter;

import com.ly.ckibana.constants.Constants;
import org.apache.commons.lang3.RandomStringUtils;
import org.slf4j.MDC;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;
import org.springframework.util.StringUtils;
import org.springframework.web.filter.OncePerRequestFilter;

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

@Configuration
public class LogRequestIdFilter extends OncePerRequestFilter {

    @Value("${request-id-header:x-request-id}")
    private String requestIdHeader;

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
        // inject request id
        String header = request.getHeader(requestIdHeader);
        String requestId = StringUtils.hasLength(header) ? header : RandomStringUtils.randomAlphabetic(15);
        MDC.put(Constants.X_REQUEST_ID, requestId);
        response.addHeader(Constants.X_REQUEST_ID, requestId);

        // execute
        filterChain.doFilter(request, response);

        // clean up
        MDC.clear();
    }
}
