package com.dy.common.webFilter;

import java.io.IOException;

import jakarta.servlet.*;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

/**
 * SpringBoot 跨域处理过滤器
 */
@Slf4j
@Component
public class CROSFilter implements Filter {

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

    @Override
    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
            throws IOException, ServletException {
        HttpServletResponse response = (HttpServletResponse) res;

        //HttpServletRequest reqs = (HttpServletRequest) req;
        /*
         * 跨域设置允所有请求跨域
         * 如果允许指定的客户端跨域设置: http://127.0.0.1:8020
         */
        response.setHeader("Access-Control-Allow-Origin","*");
        response.setHeader("Access-Control-Allow-Credentials", "true");
        response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
        response.setHeader("Access-Control-Max-Age", "3600");
        response.setHeader("Access-Control-Allow-Headers", "Content-Type");
        if (((HttpServletRequest) req).getMethod().equals("OPTIONS")) {
            response.getWriter().println("ok");
            return;
        }

        chain.doFilter(req, res);
    }

    @Override
    public void destroy() {
    }

}