package com.panzhihua.zuul.filters;

import java.util.*;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;

/**
 * @program: springcloud_k8s_panzhihuazhihuishequ
 * @description: 组装request参数
 * @author: huang.hongfa weixin hhf9596 qq 959656820
 * @create: 2020-11-26 10:32
 **/
public class SafeboxRequestWrapper extends HttpServletRequestWrapper {
    private Map<String, String> headerMap = new HashMap<String, String>();
    private Map<String, String[]> params = new HashMap<String, String[]>();
    public SafeboxRequestWrapper(HttpServletRequest request) {
        super(request);
        // 将参数表，赋予给当前的Map以便于持有request中的参数
        this.params.putAll(request.getParameterMap());
    }

    public void addHeader(String name, String value) {
        headerMap.put(name, value);
    }

    @Override
    public String getHeader(String name) {
        String headerValue = super.getHeader(name);
        if (headerMap.containsKey(name)) {
            headerValue = headerMap.get(name);
        }
        return headerValue;
    }

    @Override
    public Enumeration<String> getHeaderNames() {
        List<String> names = Collections.list(super.getHeaderNames());
        for (String name : headerMap.keySet()) {
            names.add(name);
        }
        return Collections.enumeration(names);
    }

    @Override
    public Enumeration<String> getHeaders(String name) {
        List<String> values = Collections.list(super.getHeaders(name));
        if (headerMap.containsKey(name)) {
            values.add(headerMap.get(name));
        }
        return Collections.enumeration(values);
    }

    @Override

    public String getParameter(String name) {// 重写getParameter，代表参数从当前类中的map获取

        String[] values = params.get(name);

        if (values == null || values.length == 0) {

            return null;

        }

        return values[0];

    }

    @Override
    public String[] getParameterValues(String name) {// 同上

        return params.get(name);

    }
}