package net.ramapuram.thomas.webapp.util;
   
   import org.apache.commons.logging.Log;
   import org.apache.commons.logging.LogFactory;
   
   import javax.servlet.http.Cookie;
   import javax.servlet.http.HttpServletRequest;
   import javax.servlet.http.HttpServletResponse;
   
  /**
   * Convenience class for setting and retrieving cookies.
   */
  public final class RequestUtil {
      private static final Log log = LogFactory.getLog(RequestUtil.class);
  
      /**
       * Checkstyle rule: utility classes should not have public constructor
       */
      private RequestUtil() {
      }
  
      /**
       * Convenience method to set a cookie
       *
       * @param response the current response
       * @param name the name of the cookie
       * @param value the value of the cookie
       * @param path the path to set it on
       */
      public static void setCookie(HttpServletResponse response, String name,
                                   String value, String path) {
          if (log.isDebugEnabled()) {
              log.debug("Setting cookie '" + name + "' on path '" + path + "'");
          }
  
          Cookie cookie = new Cookie(name, value);
          cookie.setSecure(false);
          cookie.setPath(path);
          cookie.setMaxAge(3600 * 24 * 30); // 30 days
  
          response.addCookie(cookie);
      }
  
      /**
       * Convenience method to get a cookie by name
       *
       * @param request the current request
       * @param name the name of the cookie to find
       *
       * @return the cookie (if found), null if not found
       */
      public static Cookie getCookie(HttpServletRequest request, String name) {
          Cookie[] cookies = request.getCookies();
          Cookie returnCookie = null;
  
          if (cookies == null) {
              return returnCookie;
          }
  
          for (final Cookie thisCookie : cookies) {
              if (thisCookie.getName().equals(name) && !"".equals(thisCookie.getValue())) {
                  returnCookie = thisCookie;
                  break;
              }
          }
  
          return returnCookie;
      }
  
      /**
       * Convenience method for deleting a cookie by name
       *
       * @param response the current web response
       * @param cookie the cookie to delete
       * @param path the path on which the cookie was set (i.e. /appfuse)
       */
      public static void deleteCookie(HttpServletResponse response,
                                      Cookie cookie, String path) {
          if (cookie != null) {
              // Delete the cookie by setting its maximum age to zero
              cookie.setMaxAge(0);
              cookie.setPath(path);
              response.addCookie(cookie);
          }
      }
  
      /**
       * Convenience method to get the application's URL based on request
       * variables.
       * 
       * @param request the current request
       * @return URL to application
       */
      public static String getAppURL(HttpServletRequest request) {
          if (request == null) return "";
          
          StringBuffer url = new StringBuffer();
          int port = request.getServerPort();
          if (port < 0) {
             port = 80; // Work around java.net.URL bug
         }
         String scheme = request.getScheme();
         url.append(scheme);
         url.append("://");
         url.append(request.getServerName());
         if ((scheme.equals("http") && (port != 80)) || (scheme.equals("https") && (port != 443))) {
             url.append(':');
             url.append(port);
         }
         url.append(request.getContextPath());
         return url.toString();
     }
 }