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/**
 * MIT License
 * Copyright (c) 2018 yadong.zhang
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package me.zhyd.braum.spring.boot.utils;

import javax.servlet.http.HttpServletRequest;
import java.util.Enumeration;

/**
 * @author yadong.zhang (yadong.zhang0415(a)gmail.com)
 * @version 1.0
 * @since 1.0
 */
public class RequestUtil {

    private HttpServletRequest request;

    public RequestUtil(HttpServletRequest request) {
        this.request = request;
    }

    public String getParameters() {
        Enumeration paraNames = request.getParameterNames();
        if (paraNames == null) {
            return null;
        }
        StringBuilder sb = new StringBuilder();
        while (paraNames.hasMoreElements()) {
            String paraName = paraNames.nextElement();
            sb.append("&").append(paraName).append("=").append(request.getParameter(paraName));
        }
        return sb.toString();
    }

    public String getHeader(String headerName) {
        return request.getHeader(headerName);
    }

    public String getReferer() {
        return getHeader("Referer");
    }

    public String getUa() {
        return getHeader("User-Agent");
    }

    public String getIp() {
        String ip = request.getHeader("x-forwarded-for");
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
        }
        return ip;
    }

    public String getRequestUrl() {
        return request.getRequestURL().toString();
    }

    public String getServletPath() {
        return request.getServletPath();
    }

    public String getMethod() {
        return request.getMethod();
    }

}