/* ************************************************************************

   qooxdoo - the new era of web development

   http://qooxdoo.org

   Copyright:
     2004-2011 1&1 Internet AG, Germany, http://www.1und1.de

   License:
     LGPL: http://www.gnu.org/licenses/lgpl.html
     EPL: http://www.eclipse.org/org/documents/epl-v10.php
     See the LICENSE file in the project's top-level directory for details.

   Authors:
     * Tristan Koch (tristankoch)

************************************************************************ */

/**
 * Static helpers for handling requests.
 */
qx.Class.define("qx.util.Request",
{
  statics:
  {
    /**
     * Whether URL given points to resource that is cross-domain,
     * i.e. not of same origin.
     *
     * @param url {String} URL.
     * @return {Boolean} Whether URL is cross domain.
     */
    isCrossDomain: function(url) {
      var result = qx.util.Uri.parseUri(url),
          location = window.location,
          protocol = location.protocol;

      // URL is relative in the sence that it points to origin host
      if (!(url.indexOf("//") !== -1)) {
        return false;
      }

      if (protocol.substr(0, protocol.length-1) == result.protocol &&
          location.host === result.host &&
          location.port === result.port) {
        return false;
      }

      return true;
    },

    /**
     * Determine if given HTTP status is considered successful.
     *
     * @param status {Number} HTTP status.
     * @return {Boolean} Whether status is considered successful.
     */
    isSuccessful: function(status) {
      return (status >= 200 && status < 300 || status === 304);
    },

    /**
     * Request body is ignored for HTTP method GET and HEAD.
     *
     * See http://www.w3.org/TR/XMLHttpRequest2/#the-send-method.
     *
     * @param method {String} The HTTP method.
     * @return {Boolean} Whether request may contain body.
     */
    methodAllowsRequestBody: function(method) {
      return !((/^(GET)|(HEAD)$/).test(method));
    }
  }
});
