se.wfh.libs.common.web.util.ApplicationHelper Maven / Gradle / Ivy

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package se.wfh.libs.common.web.util;

import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public final class ApplicationHelper {
	private static final Logger LOGGER = LoggerFactory
			.getLogger(ApplicationHelper.class);

	public static final String USER_ID_KEY = "wfh_userId";
	public static final String ADMIN_KEY = "wfh_isAdmin";
	public static final String EXCEPTION_KEY = "wfh_exception";

	private ApplicationHelper() {
		throw new AssertionError("No instances for you!");
	}

	public static HttpSession getSession(final HttpServletRequest request) {
		return request.getSession(true);
	}

	public static String getIp(final HttpServletRequest req) {
		String ip = req.getRemoteAddr();
		if (req.getHeader("x-forwarded-for") != null && isLocalhost(ip)) {
			ip = req.getHeader("x-forwarded-for");
		}

		return ip;
	}

	private static boolean isLocalhost(final String remoteAddr) {
		try {
			return NetworkInterface.getByInetAddress(InetAddress
					.getByName(remoteAddr)) != null;
		} catch (SocketException | UnknownHostException sex) {
			LOGGER.warn("Error fetching inetinterface");
			LOGGER.debug(sex.getLocalizedMessage(), sex);
			return false;
		}
	}

	public static Integer getUserId(final HttpSession session) {
		return (Integer) session.getAttribute(USER_ID_KEY);
	}

	public static Throwable getException(final HttpSession session) {
		Throwable thr = (Throwable) session.getAttribute(EXCEPTION_KEY);
		session.removeAttribute(EXCEPTION_KEY);
		return thr;
	}

	public static Boolean isAdmin(final HttpSession session) {
		return Boolean.TRUE.equals(session.getAttribute(ADMIN_KEY));
	}

	public static Boolean isLoggedIn(final HttpSession session) {
		return getUserId(session) != null;
	}
}