com.github.gkutiel.flip.web.Flipper Maven / Gradle / Ivy

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package com.github.gkutiel.flip.web;

import java.io.IOException;
import java.util.logging.Logger;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class Flipper {
	static class RedirectException extends RuntimeException {
		public RedirectException(final String msg) {
			super(msg);
		}
	}

	private static final Logger LOGGER = Logger.getLogger(Flipper.class.getCanonicalName());

	HttpServletRequest req;

	HttpServletResponse res;

	public void del(final String key) {
		final Cookie c = new Cookie(key, "");
		c.setMaxAge(0);
		res.addCookie(c);
		LOGGER.info("DELETING COOKIE: " + key);
	}

	public final  T get(final Key key) {
		final String val = HttpUtils.get(req.getCookies(), key.name());
		if (val == null) return null;
		final T t = HttpUtils.verify(val, key.valType());
		if (t == null) del(key.name());
		return t;
	}

	public  T redirect(final Class c, final String method) {
		final StringBuilder url = new StringBuilder();
		url.append("/");
		url.append(c.getSimpleName());
		if (method != null) {
			url.append("/");
			url.append(method);
		}
		return this.redirect(url.toString());
	}

	public  T redirect(final String location) {
		try {
			res.sendRedirect(location);
			throw new RedirectException(location);
		} catch (final IOException e) {
			throw new RuntimeException(e);
		}
	}

	public  T redirectIfNull(final T value, final String location) {
		if (value != null) return value;
		return redirect(location);
	}

	public final  void set(final Key key, final T val) {
		this.set(key, val, -1);
	}

	public final  void set(final Key key, final T val, final int maxAge) {
		if (val == null) throw new NullPointerException("val can't be null");
		final Cookie c = HttpUtils.signedCookie(key.name(), val);
		c.setPath("/");
		c.setMaxAge(maxAge);
		res.addCookie(c);
		LOGGER.info("SETTING COOKIE: " + c.getName() + " : " + c.getValue());
	}

}