get Redirected URL - Vimperator Plugin

test-redirect.js

/*
 * get Redirected URL - Vimperator Plugin
 * Command:
 *   :testurl {URL}
 */
function getRedirectedURL(url){
  if (typeof url != "string")
    throw new TypeError("url must be string");
  let uri = util.newURI(url);
  if (!uri.schemeIs("http") && !uri.schemeIs("https"))
    return uri.spec;

  let channel = services.get("io")
                .newChannelFromURI(uri)
                .QueryInterface(Ci.nsIHttpChannel);
  let stream = channel.open();
  stream.close();
  let res = [url, channel.responseStatus, channel.responseStatusText];
  switch(channel.responseStatus){
    case 301:
    case 302:
    case 307:
      res.push(channel.getResponseHeader("Location"));
  }
  return res.join(" ");
}
commands.addUserCommand(["testurl"], "get redirected url",
  function(args){
    liberator.echo(getRedirectedURL(args[0]), true);
  }, {
    argCount: 1,
  }, true);

// vim: sw=2 ts=2 et: