package com.vincent.rsf.server.common.interceptor.severlet;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;

@WebFilter("/*") // 拦截所有请求
public class ParameterAddingFilter implements Filter {

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        // 初始化逻辑
    }

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

        if (request instanceof HttpServletRequest) {
            // 创建可修改参数的请求包装器
            ParameterAddableRequest wrappedRequest =
                    new ParameterAddableRequest((HttpServletRequest) request);

            // 添加自定义参数
            addCustomParameters(wrappedRequest);

            // 继续过滤器链
            chain.doFilter(wrappedRequest, response);
        } else {
            chain.doFilter(request, response);
        }
    }

    private void addCustomParameters(ParameterAddableRequest request) {
        // 添加请求ID和时间戳
//        request.addParameter("requestId", UUID.randomUUID().toString());
        request.addParameter("timestamp", String.valueOf(System.currentTimeMillis()));
        // 根据业务需求添加其他参数
        String userAgent = request.getHeader("User-Agent");
        if (userAgent != null && userAgent.contains("Mobile")) {
            request.addParameter("deviceType", "mobile");
        } else {
            request.addParameter("deviceType", "desktop");
        }
    }

    @Override
    public void destroy() {
        // 清理逻辑
    }
}