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

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package com.github.gkutiel.flip.web;

import java.util.logging.Logger;

import javax.servlet.http.Cookie;

import com.github.gkutiel.flip.utils.Utils;
import com.google.gson.Gson;

enum HttpUtils {
	;
	private static final String SEP = ":";

	private static final Logger LOGGER = Logger.getLogger(HttpUtils.class.getCanonicalName());
	private static final Gson GSON = new Gson();

	static  T get(final Cookie[] cookies, final Key key) {
		final String val = HttpUtils.get(cookies, key.name());
		if (val == null) return null;
		final T t = HttpUtils.verify(val, key.valType());
		return t;
	}

	static String get(final Cookie[] cs, final String key) {
		if (cs == null) return null;
		for (final Cookie c : cs)
			if (c.getName().equals(key)) return c.getValue();
		return null;
	}

	static Cookie signedCookie(final String key, final Object val) {
		final String data = GSON.toJson(val);
		final String sign = Utils.Cryptography.sign(data);
		return new Cookie(key, sign + SEP + data);
	}

	static  T verify(final String val, final Class type) {
		final String[] args = val.split(SEP, 2);
		if (args.length != 2) return null;
		final String sign = args[0];
		final String data = args[1];
		if (!Utils.Cryptography.verify(data, sign)) {
			LOGGER.info("INVALID COOKIE: " + val);
			return null;
		}
		return GSON.fromJson(data, type);
	}
}