CookieUtil.java

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/*
 * Turró i Cutiller Foundation. License notice.
 * Copyright (C) 2011 Lluis Turró Cutiller <http://www.turro.org/>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.turro.elephant.impl.util;
 
import java.io.IOException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.codec.DecoderException;
import org.apache.commons.codec.binary.Base64;
import org.turro.elephant.context.ElephantContext;
 
public class CookieUtil {
  
  private CookieUtil() {}
  
  public static Cookie getCookie(HttpServletRequest request, String name) {
    Cookie[] cookies = request.getCookies();
    if(cookies == null) return null;
    for(int i = 0; i < cookies.length; i++)
      if(cookies[i].getName().equals(name))
        return cookies[i];
    return null;
  }
 
  public static void setCookie(HttpServletResponse response, String name, String value, String path, int age) {
    Cookie cookie = new Cookie(name, value);
    if(ElephantContext.getUseSSL()) cookie.setSecure(true);
    cookie.setPath(path);
    cookie.setMaxAge(age);
    response.addCookie(cookie);
  }
 
  public static void deleteCookie(HttpServletResponse response, String name, String path) {
    Cookie cookie = new Cookie(name, null);
    cookie.setPath(path);
    cookie.setMaxAge(0);
    response.addCookie(cookie);
  }
 
  public static void encryptCookie(HttpServletResponse response, String name, byte[] value, String path, int age) {
    Cookie cookie = new Cookie(name, new String(new Base64().encode(value)));
    if(ElephantContext.getUseSSL()) cookie.setSecure(true);
    cookie.setVersion(1);
    cookie.setPath(path);
    cookie.setMaxAge(age);
    response.addCookie(cookie);
  }
 
  public static byte[] decryptCookieValue(Cookie cookie) throws IOException, DecoderException {
    return cookie == null ? null : new Base64().decode(cookie.getValue().getBytes());
  }
 
}