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package com.webapp.utils.servlet;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.lang3.StringUtils;

import com.webapp.utils.regex.RegexConst;

public final class ServletUtils {

	private ServletUtils(){}

	/**
	 * @param req
	 * @return If it is a get request, return true
	 */
	public static boolean isGet(HttpServletRequest req) {
		return req.getMethod().equalsIgnoreCase("get");
	}

	/**
	 * @param req
	 * @return If it is a post request, return true
	 */
	public static boolean isPost(HttpServletRequest req) {
		return req.getMethod().equalsIgnoreCase("post");
	}

	/**
	 * @param req
	 * @return From which pages link to come over
	 */
	public static String getReferer(HttpServletRequest req) {
		return req.getHeader("Referer");
	}

	/**
	 * For example
     * http://www.mydomain.com/request - www.mydomain.com
	 * @param req
	 * @return The requested domain name
	 */
	public static String getDomain(HttpServletRequest req) {
		String domain = req.getServerName();
		return domain + (domain.matches(RegexConst.Ip4) ? ":" + getPort(req) : "");
	}

	/**
	 * For example
     * http://www.mydomain.com/request - http://www.mydomain.com
	 * @param req
	 * @return The requested base url
	 */
	public static String getBaseUrl(HttpServletRequest req) {
		return "http://" + getDomain(req);
	}

	/**
	 * For example
     * http://localhost:8080/request - 8080
	 * @param req
	 * @return The requested port
	 */
	public static int getPort(HttpServletRequest req) {
		return req.getServerPort();
	}

	/**
	 * For example
     * http://www.mydomain.com/request - ip
	 * @param req
	 * @return The requested ip
	 */
	public static String getIpAddr(HttpServletRequest req) {
        String ip = req.getHeader("x-forwarded-for");
        if (StringUtils.isEmpty(ip)) ip = req.getHeader("Proxy-Client-IP");
        if (StringUtils.isEmpty(ip)) ip = req.getHeader("WL-Proxy-Client-IP");
        if (StringUtils.isEmpty(ip)) ip = req.getRemoteAddr();
        return ip;
    }

	public static void testRequest(HttpServletRequest request) {
		System.out.println("Protocol: " + request.getProtocol() + "
");
		System.out.println("Scheme: " + request.getScheme() + "
");
		System.out.println("Server Name: " + request.getServerName() + "
");
		System.out.println("Server Port: " + request.getServerPort() + "
");
		System.out.println("Remote Addr: " + request.getRemoteAddr() + "
");
		System.out.println("Remote Host: " + request.getRemoteHost() + "
");
		System.out.println("Character Encoding: " + request.getCharacterEncoding() + "
");
		System.out.println("Content Length: " + request.getContentLength() + "
");
		System.out.println("Content Type: " + request.getContentType() + "
");
		System.out.println("Auth Type: " + request.getAuthType() + "
");
		System.out.println("HTTP Method: " + request.getMethod() + "
");
		System.out.println("Path Info: " + request.getPathInfo() + "
");
		System.out.println("Path Trans: " + request.getPathTranslated() + "
");
		System.out.println("Query String: " + request.getQueryString() + "
");
		System.out.println("Remote User: " + request.getRemoteUser() + "
");
		System.out.println("Session Id: " + request.getRequestedSessionId() + "
");
		System.out.println("Request URI: " + request.getRequestURI() + "
");
		System.out.println("Servlet Path: " + request.getServletPath() + "
");
		System.out.println("Accept: " + request.getHeader("Accept") + "
");
		System.out.println("Host: " + request.getHeader("Host") + "
");
		System.out.println("Referer : " + request.getHeader("Referer") + "
");
		System.out.println("Accept-Language : " + request.getHeader("Accept-Language") + "
");
		System.out.println("Accept-Encoding : " + request.getHeader("Accept-Encoding") + "
");
		System.out.println("User-Agent : " + request.getHeader("User-Agent") + "
");
		System.out.println("Connection : " + request.getHeader("Connection") + "
");
		System.out.println("Cookie : " + request.getHeader("Cookie") + "
");
	}

}